[go: up one dir, main page]

WO2019004072A1 - Appareil d'affichage d'images à séquence de champs et procédé d'affichage d'image - Google Patents

Appareil d'affichage d'images à séquence de champs et procédé d'affichage d'image Download PDF

Info

Publication number
WO2019004072A1
WO2019004072A1 PCT/JP2018/023769 JP2018023769W WO2019004072A1 WO 2019004072 A1 WO2019004072 A1 WO 2019004072A1 JP 2018023769 W JP2018023769 W JP 2018023769W WO 2019004072 A1 WO2019004072 A1 WO 2019004072A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
period
color
lighting
subframe period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/023769
Other languages
English (en)
Japanese (ja)
Inventor
正益 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Publication of WO2019004072A1 publication Critical patent/WO2019004072A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals

Definitions

  • the present invention relates to an image display apparatus, and more particularly, to a field sequential image display apparatus and an image display method.
  • a field sequential image display apparatus that displays a plurality of subframes in one frame period.
  • a typical field sequential image display apparatus includes backlights including red, green and blue light sources, and displays red, green and blue subframes in one frame period.
  • the display panel is driven based on red image data, and a red light source emits light.
  • the green and blue subframes are displayed in a similar manner.
  • the three subframes displayed in time division are synthesized by the afterimage phenomenon on the retina of the observer and are recognized as one color image by the observer.
  • each sub-frame period when the light source of the color corresponding to the sub-frame period starts lighting before the writing of the pixel data representing the image to be displayed to the display device (for example, liquid crystal panel) is completed, the next sub A color corresponding to the frame period will be mixed in the display image (hereinafter, this phenomenon is referred to as “mixed color due to pixel data write timing”).
  • this phenomenon is referred to as “mixed color due to pixel data write timing”.
  • a display device with a slow optical response is used as in a liquid crystal display device
  • lighting of a light source of a color corresponding to the subframe period is started until the response is completed in each subframe period.
  • the color corresponding to the next sub-frame period will be mixed in the display image (hereinafter, this phenomenon is referred to as “color mixing due to optical response”).
  • color mixing due to optical response In this way, when the corresponding colors are mixed in the subframe periods adjacent to each other, the saturation falls or the hue shifts in the display image.
  • Patent Document 1 describes that in a time division color display device (field sequential type image display device), an image signal is written from the upper part of the screen by line sequential writing to a liquid crystal panel.
  • a driving method is described in which the light source corresponding to the color of the written image signal is turned on after blanking for the response time of the liquid crystal after writing up to the point (see paragraph [0060] of the same document, FIG. 8). .
  • each frame period includes a plurality of subframe periods each including a plurality of primary color subframe periods corresponding to a plurality of primary colors and a common color subframe period.
  • a device A light source unit including a plurality of light sources emitting light in the plurality of primary colors; A light modulation unit that transmits or reflects light from the light source unit; A light source unit driving circuit for driving the light source unit such that light of a corresponding color is emitted to the light modulation unit in each subframe period; A light modulation unit driving circuit for controlling the transmittance or the reflectance of the light modulation unit so that an image of a corresponding color is displayed in each subframe period;
  • the light source unit drive circuit is configured to start lighting the light source of the first primary color corresponding to the preceding subframe period which is the immediately preceding subframe period in the common color subframe period from the start point of the common color subframe period And the time from the start of the subsequent subframe period which is a subframe period
  • Preferred configurations of the above embodiments receive substantially the input light data corresponding to a plurality of primary colors, and substantially change in transmittance or reflectance in the light modulation section when switching from the preceding subframe period to the common color subframe period. From the input image data so that the transmittance or the reflectance in the light modulation section does not substantially change or increase when switching from the common color subframe period to the subsequent subframe period.
  • the light modulation unit driving circuit further displays an image of a corresponding color in each subframe period based on the driving image data. Control the transmittance or reflectance of the light modulation unit.
  • Another embodiment of the present invention is an image display device including a light source unit including a plurality of light sources emitting light of a plurality of primary colors, and a light modulation unit transmitting or reflecting light from the light source unit.
  • An image display method for displaying a color image according to a field sequential method in which each frame period includes a plurality of sub-frame periods consisting of a plurality of primary color sub-frame periods and a common color sub-frame period respectively corresponding to the plurality of primary colors.
  • the light source unit driving step when the light source of the first primary color corresponding to the preceding subframe period which is the immediately preceding subframe period in the common color subframe period from the start point of the common color subframe period starts lighting And the time from the start of the subsequent subframe period which is a subframe period immediately after the common color subframe period to the time when the light source of the corresponding second primary color starts lighting in the subsequent subframe period Of at least one of the plurality of primary colors from a start point of a primary color sub-frame period corresponding to another primary color other than the first and second primary colors to a time point when the light source starts lighting in the primary color
  • the light source unit is driven to be shorter than time.
  • the response of the light modulation unit when switching from the preceding subframe period to the common color subframe period, the response of the light modulation unit becomes a decay response. Even if the light source of the first primary color (the light source of the primary color corresponding to the preceding subframe period) is turned on, problems such as saturation reduction and hue shift do not occur. Also, when switching from the common color sub-frame period to the subsequent sub-frame period, the optical response of the light modulation unit becomes a rise response, so the light source of the second primary color in the subsequent sub-frame period Even if the light source of the primary color is turned on, color mixing does not occur. Therefore, the luminance of each color can be improved without causing problems such as saturation reduction and hue shift.
  • Timing chart and waveform diagram (A) for explaining the operation of the image display apparatus as the second prior art for comparison with the image display apparatus according to the first modification of the first embodiment and lighting of each light source It is a figure (B) which shows time.
  • Timing chart and waveform diagram (A) for demonstrating operation
  • a figure (B) which shows lighting time and light-emission quantity of each light source.
  • Timing chart and waveform diagram (A) for explaining the operation of the image display apparatus as the third prior art for comparison with the image display apparatus according to the second modification of the first embodiment and lighting of each light source It is a figure (B) which shows time.
  • a timing chart and waveform diagram (A) for demonstrating the operation
  • a timing chart and waveform diagram (A) for demonstrating the operation
  • Timing chart and waveform diagrams A) for demonstrating operation
  • FIG. 1 is a block diagram showing the configuration of the image display apparatus according to the first embodiment.
  • the image display device 1 shown in FIG. 1 includes an image data conversion unit 10 and a display unit 20.
  • the image data conversion unit 10 includes a parameter storage unit 11, a statistical value / saturation operation unit 12, a distribution ratio / coefficient operation unit 13, and a drive image data operation unit 33.
  • the display unit 20 includes a liquid crystal panel 24 as a light modulation unit, a backlight 25 as a light source unit, a timing control circuit 21, a panel drive circuit 22 as a light modulation unit drive circuit, and a backlight drive as a light source unit drive circuit.
  • a circuit 23 is included.
  • the image display device 1 is a field sequential liquid crystal display device.
  • the image display device 1 divides one frame period into a plurality of subframe periods, and displays subframes of different colors in each subframe period.
  • the image display device 1 divides one frame period into four subframe periods, and displays green, red, white, and blue subframes respectively in the first to fourth subframe periods (see FIG. See FIG. 7 below).
  • the white subframes become the common color subframes.
  • the “color” in each sub-frame refers to the light source color
  • the display unit 20 of the image display device 1 uses “red”, “green”, and “blue” as light source drive data for driving the backlight 25. It is assumed that "white” which is a desired color temperature can be displayed when 1 "(maximum value) is given (the same applies to other embodiments described later).
  • Input image data D1 including image data of red, green, and blue is input to the image display device 1.
  • the image data conversion unit 10 obtains driving image data D2 corresponding to the green, red, white, and blue sub-frames based on the input image data D1.
  • this process is referred to as “image data conversion process”
  • the drive image data D2 corresponding to the green, red, white, and blue sub-frames are “green, red, and so on included in the drive image data D2, respectively. It is called "white and blue image data”.
  • the display unit 20 displays green, red, white, and blue sub-frames in one frame period based on the driving image data D2.
  • the timing control circuit 21 outputs a timing control signal TC to the panel drive circuit 22 and the backlight drive circuit 23.
  • the panel drive circuit 22 drives the liquid crystal panel 24 based on the timing control signal TC and the drive image data D2.
  • the backlight drive circuit 23 drives the backlight 25 based on the timing control signal TC and a parameter WBR, which will be described later, from the parameter storage unit 11.
  • the liquid crystal panel 24 includes a plurality of pixels 26 arranged in a two-dimensional manner.
  • the backlight 25 includes a red light source 27r, a green light source 27g, and a blue light source 27b (in the following, these light sources 27r, 27g, and 27b are also referred to as "three primary color light sources”. It is also called ").
  • the backlight 25 may include a white light source.
  • panel drive circuit 22 drives liquid crystal panel 24 based on green image data included in drive image data D2, and backlight drive circuit 23
  • the green light source 27g is made to emit light.
  • the green sub-frame is displayed.
  • red sub-frame period Tr panel drive circuit 22 drives liquid crystal panel 24 based on red image data included in drive image data D2, and backlight drive circuit 23
  • the red light source 27r is made to emit light. Thereby, a red sub-frame is displayed.
  • panel drive circuit 22 drives liquid crystal panel 24 based on the white image data included in drive image data D2, and backlight drive circuit 23
  • the red light source 27r, the green light source 27g, and the blue light source 27b are made to emit light. Thereby, a white sub-frame is displayed.
  • the backlight drive circuit 23 may cause the white light source to emit light in the third subframe period.
  • panel drive circuit 22 drives liquid crystal panel 24 based on blue image data included in drive image data D2, and backlight drive circuit 23
  • the blue light source 27b is made to emit light. This causes blue sub-frames to be displayed.
  • the image data of red, green, and blue as primary color components included in the input image data D1 is luminance data normalized to a value of 0 or more and 1 or less.
  • the pixel 26 is achromatic.
  • the white, red, green, and blue image data included in the driving image data D2 are also luminance data normalized to a value of 0 or more and 1 or less.
  • the image data conversion unit 10 uses, for example, a microcomputer (hereinafter abbreviated as a "microcomputer") including a CPU (central processing unit) and a memory, and the microcomputer executes a predetermined program corresponding to FIG. 3 described later. It can be realized by software. Instead of this, it is also possible to realize part or all of the image data conversion unit 10 as dedicated hardware (typically, an application specific integrated circuit designed specifically for exclusive use).
  • the blue, green, and red values of each pixel of the image (input image) represented by the input image data D1 are coefficients to be multiplied.
  • the BGR pixel data values of the input image subjected to the amplification compression processing are pixel data values of white, red, green, and blue subframes (hereinafter referred to as “driving Color component conversion processing (hereinafter referred to as equations (5a) to (5d)).
  • white image data (values distributed to the common color sub-frames) included in the drive image data D2 is determined in the range of 0 or more and 1 or less. Further, in this image data conversion processing, for each pixel of the input image, a ratio of the display light amount to be emitted in the white subframe period Tw to the display light amount of the white component to be emitted in one frame period to display the pixel (“ The distribution ratio WRs of white subframes or “common color distribution ratio WRs” or simply “distribution ratio WRs” is determined first, and WGBR pixel data values for driving white image data etc. based on the distribution ratio WRs. Is required.
  • the adjustment factor Ks is set to 1 and the distribution ratio WRs is set to 0.6.
  • the white image data contained in the image data D2 is 0.3.
  • the parameter storage unit 11 stores parameters WRX, RA, RB, and WBR used in image data conversion processing.
  • the statistical value / saturation calculation unit 12 obtains the maximum value Dmax, the minimum value Dmin, and the saturation S for each pixel based on the input image data D1.
  • the distribution ratio / coefficient calculation unit 13 obtains the distribution ratio WRs and the adjustment coefficient (hereinafter, also simply referred to as “coefficient”) Ks based on the maximum value Dmax and the saturation S and the parameters WRX, RA, RB, WBR (Details Is mentioned later).
  • the drive image data calculation unit 33 obtains the drive image data D2 based on the input image data D1, the minimum value Dmin, the distribution ratio WRs, the coefficient Ks, and the parameter WBR.
  • the parameter WRX is a parameter according to the response characteristic of the pixel 26 included in the display unit 20.
  • the parameter WRX is included in the formula for determining the distribution ratio WRs.
  • the parameter WBR specifies the luminance of the light source 27 included in the backlight 25 when displaying a white subframe, and takes a value within the range of 0 ⁇ WBR ⁇ 1.
  • the luminance of the light source 27 when displaying a white subframe is controlled to WBR times the luminance of the light source 27 when displaying another subframe.
  • the minimum value in one frame period of the driving image data D2 is DDmin, and the maximum value is DDmax.
  • the distribution ratio / coefficient operation unit 13 obtains the coefficient Ks so as to satisfy the following equation (1) according to the parameters RA and RB stored in the parameter storage unit 11. DDmax ⁇ RA ⁇ DDmin + RB (1)
  • RB 1-RA
  • the range satisfying the equation (1) is the hatched portion shown in FIG.
  • the parameters RA and RB designate the range of the maximum value DDmax according to the minimum value DDmin.
  • one frame period is determined by determining the range of the maximum value in one frame period of the drive image data in accordance with the minimum value in one frame period of the drive image data. It is possible to suppress the change of the image data after conversion and improve the color reproducibility.
  • FIG. 3 is a flowchart of the image data conversion process.
  • the process shown in FIG. 3 is performed on the data of each pixel included in the input image data D1.
  • the red, green and blue image data (BGR pixel data value of the input image) of a certain pixel included in the input image data D1 are respectively included in Ri, Gi, Bi, and the drive image data D2
  • Wd, Bd, Gd, and Rd be the white, blue, green, and red image data (WBGR pixel data values for driving), respectively, and the process for the three-color image data Ri, Gi, and Bi will be described.
  • image data Ri, Gi, Bi of three colors are input to the image data conversion unit 10 (step S101).
  • the statistical value / saturation calculation unit 12 obtains the maximum value Dmax and the minimum value Dmin for the image data Ri, Gi, Bi of three colors (step S102).
  • the statistical value / saturation calculating unit 12 obtains the saturation S according to the following equation (2) based on the maximum value Dmax and the minimum value Dmin (step S103).
  • S (Dmax-Dmin) / Dmax (2)
  • S 0.
  • the distribution ratio / coefficient calculation unit 13 obtains the distribution ratio WRs of the white subframe based on the parameter WRX (step S104).
  • the WRs is not limited to this, and may be a value near 0.5. More generally, the distribution ratio WRs may be WBR / (1 + WBR) or a value in the vicinity thereof (the details will be described later).
  • the distribution ratio / coefficient calculating unit 13 obtains the coefficient Ks according to a calculation formula described later based on the saturation S and the parameters WRX, RA, RB, and WBR (step S105).
  • the distribution ratio / coefficient calculation unit 13 uses the distribution ratio WRs and uses the maximum value Dmax of the input image data D1 as the input image data D1. Under the condition that the possible maximum value is 1, the maximum value (or the value below the maximum value) that the coefficient Ks can take is determined.
  • the drive image data calculation unit 33 performs the following equations (5a) to (5d) Image data Wd, Bd, Gd, Rd of four colors are obtained according to the above (step S106).
  • Wd WRs ⁇ Dmin ⁇ Ks ⁇ PP / WBR (5a)
  • Bd (Bi ⁇ WRs ⁇ Dmin) Ks ⁇ PP (5b)
  • Gd (Gi-WRs.Dmin) Ks.PP
  • Rd (Ri-WRs-Dmin) Ks-PP (5d)
  • the image data conversion unit 10 uses the parameters RA, RB, WRX, and WBR to generate data (data of BGR pixel data of the input image) Ri, Gi, and Bi of each pixel included in the input image data D1.
  • the driving image data D2 is generated by obtaining white, blue, green and red image data (WBGR pixel data values for driving) Wd, Bd, Gd and Rd of the pixel.
  • the parameter WBR for determining the luminance of the light source 27 in the white subframe period Tw is 1 (the luminance of the light source 27 emitting light in the white subframe period Tw is 1 for the light source 27 emitting in other than the white subframe period Tw).
  • the distribution ratio WRs is set to 50% (step S104) or a value in the vicinity thereof. More generally, the distribution ratio WRs in the present embodiment is set as follows.
  • the maximum value of the blue, green and red image data Bd, Gd, Rd included in the driving image data D2 is Ddmax, and the minimum value is Ddmin.
  • PP 1, Wd, Ddmax, and Ddmin are given by the following equations (6a) to (6c), respectively.
  • Wd WRs ⁇ Dmin ⁇ Ks / WBR (6a)
  • Ddmax (Dmax ⁇ WRs ⁇ Dmin) Ks (6b)
  • Ddmin (Dmin-WRs ⁇ Dmin) Ks (6c)
  • the distribution ratio WRs is determined such that Wd ⁇ Ddmin, the transmittance of the liquid crystal decreases when switching from the other subframe period to the white subframe period Tw, and from the white subframe period Tw to the other subframes It rises when switching to a period. As described later, in the present embodiment, this point is used to prevent color mixing due to the optical response. If Wd ⁇ Ddmin is solved using equations (6a) and (6c), the following equation is obtained.
  • the saturation S and the distribution ratio WRs take values of 0 or more and 1 or less.
  • the range of (S, WRs) indicated by the saturation S and the distribution ratio WRs is a first area where Ddmin ⁇ Wd ⁇ Ddmax, a second area where Ddmax ⁇ Wd, and Wd ⁇ It is divided into the 3rd area which becomes Ddmin.
  • the maximum value Dmax is the lightness Vi of the input image data D1.
  • Ks WBR.RB / ⁇ WBR- (WBR + RA) WRs (1-S) ⁇ (25)
  • the backlight 25 is configured using a light emitting diode (LED), but the configuration of the backlight is not limited to this (the same applies to other embodiments).
  • LED light emitting diode
  • FIG. 5 is a block diagram showing the configuration of the backlight drive circuit 23 as a light source drive circuit.
  • the backlight drive circuit 23 includes a lighting control circuit 230 and a backlight power circuit 232.
  • the lighting control circuit 230 includes an LED control circuit 231, a red light source switch 23r, a green light source switch 23g, and a blue light source switch 23b.
  • the LED control circuit 231 generates a red light source control signal CswR, a green light source control signal CswG, and a blue light source control signal CswB based on the timing control signal TC from the timing control circuit 21, and switches the red light source switch 23r for the green light source.
  • the switch 23g and the blue light source switch 23b are respectively provided.
  • the red light source switch 23r is in the on state when the red light source control signal CswR is at the high level (H level), and is in the off state when the red light source control signal CswR is at the low level (L level).
  • the green light source switch 23g is in the on state when the green light source control signal CswG is at the H level, and is in the off state when the green light source control signal CswG is at the L level.
  • the blue light source switch 23b is on when the blue light source control signal CswB is at the H level, and is off when the blue light source control signal CswB is at the L level.
  • the red light source 27r, the green light source 27g, and the blue light source 27b in the backlight 25 are connected to the backlight power circuit 232 via the red light source switch 23r, the green light source switch 23g, and the blue light source switch 23b.
  • the red light source drive signal SdvR, the green light source drive signal SdvG, and the blue light source drive signal SdvB are supplied as drive signals to the red light source 27r, the green light source 27g, and the blue light source 27b.
  • the red light source 27r is on when the red light source control signal CswR is H level and off when L level
  • the green light source 27g is on when the green light source control signal CswG is H level and off when L level
  • the blue light source 27b is in the on state when the blue light source control signal CswB is at the H level, and in the off state when the blue light source control signal CswB is at the L level.
  • FIG. 6 shows a conventional field sequential liquid crystal display device (hereinafter referred to as “conventional image display device” or “first method”) having a backlight drive circuit similar to the backlight drive circuit 23 configured as shown in FIG. It is a timing chart for explaining the driving of the backlight in the “conventional example”.
  • driving of the backlight in the first conventional example will be described as a comparative example.
  • the same or corresponding parts as in the image display device according to the present embodiment are given the same reference numerals.
  • each subframe period Tg, Tr, Tw, Tb is a turn-off period Toff during which light is not irradiated from the backlight 25 to the liquid crystal panel 24.
  • the second half is a backlight 25 is a lighting period Ton during which light is emitted to the liquid crystal panel 24.
  • the symbol "Cft" in FIG. 6 indicates a subframe indication signal included in the timing control signal TC supplied from the timing control circuit 21 to the LED control circuit 231 (the same applies to FIG. 7).
  • the backlight drive circuit 23 selectively drives the red light source 27r, the green light source 27g, and the blue light source 27b in the backlight 25 in accordance with the red light source control signal CswR, the green light source control signal CswG, and the blue light source control signal CswB. As can be seen from the waveforms of the light source control signals CswR, CswG, CswB shown in FIG.
  • the green light source control signal CswG is a pulse width modulated signal so that the green light source 27g lights up with a desired light emission intensity.
  • a green image is generated in the green subframe period Tg based on the input signal Din.
  • a red image is displayed in the red subframe period Tr
  • a white image is displayed in the white subframe period Tw
  • a blue image is displayed in the blue subframe period Tb
  • a color image by additive color mixture over time is displayed on the liquid crystal panel 24. Be done.
  • the details of the display operation in such a first conventional example will be described later (see FIG. 8).
  • FIG. 7 is a timing chart for explaining the driving of the backlight 25 in the present embodiment.
  • the light-off period Toff during which light is not emitted from the light 25 to the liquid crystal panel 24 is a lighting period Ton during which light is emitted from the backlight 25 to the liquid crystal panel 24 in the second half.
  • the corresponding light sources are lit in both the first half and the second half.
  • the respective pixel data constituting D 2 are sequentially written to the liquid crystal panel 24.
  • the backlight drive circuit 23 selectively drives the red light source 27r, the green light source 27g, and the blue light source 27b in the backlight 25 in accordance with the red light source control signal CswR, the green light source control signal CswG, and the blue light source control signal CswB.
  • the red light source control signal CswR, CswG, and CswB shown in FIG. 7 only the green light source 27g is used in the green subframe period Tg as the first subframe period, and the red subframe period Tr as the second subframe period.
  • the red light source 27r is turned on, and only the blue light source 27b is turned on in the blue sub-frame period Tb as the fourth sub-frame period, and in the white sub-frame period Tw as the third sub-frame period
  • the light source 27r is turned on, and the red light source 27r, the green light source 27g, and the blue light source 27b are simultaneously turned on in the second half period.
  • green light, red light, white light and blue light are respectively irradiated to the back surface of the liquid crystal panel 24 in the green subframe period Tg, the red subframe period Tr, the white subframe period Tw and the blue subframe period Tb.
  • the light emission color of the backlight 25 is slightly shifted in the red direction from white (hereinafter referred to as “white in white display”) displayed when the input image data D1 for white display is given. (Details will be described later).
  • driving of the liquid crystal panel 24 (writing of pixel data to each pixel formation unit 30) and driving of the backlight 25 allow the green sub-frame period Tg based on the input signal Din.
  • the green image is displayed in the red subframe period Tr
  • the white image is displayed in the white subframe period Tw
  • the blue image is displayed in the blue subframe period Tb. Is displayed on the liquid crystal panel 24. Details of the display operation in this embodiment will be described later (see FIG. 9).
  • red light emitting diode hereinafter referred to as "R-LED”
  • red light source 27r a green light emitting diode
  • G-LED green light source
  • blue light source 27b a blue light emitting diode
  • R-LED red light emitting diode
  • B-LED blue light emitting diode
  • FIG. 8A is a timing chart and waveform diagram for explaining the display operation of the first conventional example in which the backlight 25 is driven as shown in FIG. 6, and FIG. 8B shows the first example. It is a figure which shows the lighting time of each light source (R-LED, G-LED, B-LED) in a prior art example.
  • R-LED light source
  • G-LED G-LED
  • B-LED light source
  • the response of liquid crystal (temporal change in transmittance) is indicated by a thick dotted line.
  • the lighting time is shown as a relative value (duty ratio) in which the length of one frame period Tfr is "1"
  • the "primary color subframe period” means a red subframe period Tr, a green subframe period. It is a generic term for Tg and blue subframe period Tb.
  • the above expression method in FIG. 8 is also adopted in FIGS. 9 and 14 to 29.
  • the ratio of the lighting time of three primary color light sources (R-LED, G-LED, B-LED) in one frame period (that is, the ratio of the duty ratio) is 1: 2/3: 1 (
  • Each light source (R-) is set such that the ratio of the lighting time (ratio of duty ratio) of the three primary color light sources for white balance is 1: 2/3: 1 (see “TOTAL” in FIG. 8B). It is assumed that current values at the time of lighting of the LED, G-LED, and B-LED are set in advance.
  • the central time of each sub-frame period (the time corresponding to 50% of one sub-frame period) is preset as the light emission control reference time point tecr, and in the first conventional example, the light source is turned on in each sub-frame period When it does, lighting is started from this light emission control reference time point tecr.
  • the period (first half period) before the light emission control reference time point tecr in each subframe period includes the period in which the response of the liquid crystal is in the transition state (transition state), and light emission from the start point in each subframe period Until the control reference time point tecr is the time to suppress the lighting of the light source.
  • the light emission control reference time point tecr is set to an end time point of time in which the light emission of the light source is to be suppressed from the viewpoint of the response characteristic of the liquid crystal in each sub-frame period, it is not limited thereto.
  • the time from the light emission control reference time point tecr to the end point in the subframe period corresponds to the maximum light source lighting time.
  • the maximum light source lighting time corresponds to the maximum lighting time that can be secured in each sub-frame period while avoiding the color mixing hue shift due to the response characteristic of the liquid crystal.
  • the light emission control reference time point tecr is set from such a viewpoint. Also in the following, the central time of each subframe period (the time corresponding to 50% of one subframe period) is used as the light emission control reference time point tecr, but the light emission control reference time point tecr is limited to this. However, it should be determined in consideration of the response characteristics of the liquid crystal, the writing speed of the pixel data to the liquid crystal panel 24, and the like.
  • FIG. 9A is a timing chart and a waveform diagram for explaining the display operation in the present embodiment in which the backlight 25 is driven as shown in FIG. 7, and FIG. It is a figure which shows the lighting time and light-emission quantity of each primary color light source (R-LED, G-LED, B-LED).
  • the ratio of the lighting time of the three primary color light sources (R-LED, G-LED, B-LED) in one frame period Tfr is 1.5: 1: 1.5 (see FIG. 9B).
  • the hour current value is preset.
  • the backlight 25 is driven according to the red light source control signal CswR, the green light source control signal CswG, and the blue light source control signal CswB shown in FIG. 7, and the panel is driven based on the drive image data D2 described above.
  • the liquid crystal panel 24 is driven by the circuit 22, as shown in FIG. 9A, the light sources 27r, 27g and 27b in the backlight 25 are turned on, and the liquid crystal in the liquid crystal panel 24 responds.
  • the bar graph in the lower part of FIG. 9B shows the light emission amount of each of the three primary color light sources (R-LED, G-LED, B-LED) in the white subframe period Tw (W-SF) in one frame period Tfr. , And the amount of light emission of each of the three primary color light sources in one frame period Tfr (TOTAL).
  • TOTAL the amount of light emission of each of the three primary color light sources in one frame period
  • the red light source 27r when the input image data D1 indicating red display is given, the red light source 27r is turned on in the first half of the white sub-frame period Tw, as shown in the waveform diagram in the lower part of FIG.
  • the amount of light emitted per light source (LED) is increased more than in the first conventional example while suppressing the hue shift.
  • FIG. 10 is a diagram showing a display operation when the color to be displayed (hereinafter referred to as “target color”) is changed in the image display device according to the present embodiment.
  • a display operation (a response state of a liquid crystal and an operation state of an LED as a light source), and a white color is set as a target color in a conventional image display device having a distribution ratio WRs of 100% as a comparative example.
  • the drive image data and display operation (hereinafter referred to as "case (10)") are also shown.
  • thick dotted lines in the waveform diagram showing display operation indicate the response of liquid crystal (temporal change of transmittance).
  • the primary color sub-frame period (following sub-frame period) which is the same as or smaller than the value of the red image data Rd as driving image data of the period Tr and immediately after the white sub-frame period
  • the value is the same as or smaller than the value of the blue image data Bd as driving image data of the blue subframe period Tb.
  • the liquid crystal response (optical response of the liquid crystal panel 24) in this embodiment is white from the red subframe period (preceding subframe period) Tr. Whenever it switches to a subframe period (common color subframe period) Tw, it becomes a decay response, and when it switches from a white subframe period (common color subframe period) Tw to a blue subframe period (following subframe period) Tb, it always becomes a rise response. Become.
  • a red light source which is a light source of a color corresponding to a red subframe period Tr as a preceding subframe period in the white subframe period Tw as a common color subframe period.
  • the relative time (the time based on the start point t3 of the white subframe period) at which the 27r (R-LED) starts lighting is a green subframe that is a primary color subframe period other than the preceding subframe period and the subsequent subframe period. It is earlier than the relative time (lighting start time tecr with reference to the start point t1 in the green subframe period Tg) that the light source 27g (G-LED) starts lighting in the period Tg. Further, as shown in FIG.
  • the relative time (light source point in the blue subframe period t4) at which the light source 27b (B-LED) starts lighting in the blue subframe period Tb as the subsequent subframe period is used as a reference.
  • Time is a relative time (lighting start time in the green subframe period Tg) at which the light source 27g (G-LED) starts lighting in the green subframe period Tg which is a primary color subframe period other than the preceding subframe period and the subsequent subframe period It is earlier than the lighting start time tecr) based on t1.
  • the response of the liquid crystal becomes a decay response. Even if the red light source (R-LED) is turned on in the first half of the period Tw, problems such as saturation reduction and hue shift do not occur. Also, when switching from the white subframe period Tw (common color subframe period) to the blue subframe period Tb (following subframe period), the response of the liquid crystal is a rise response, so the blue light source Even if the B-LED) lights up, color mixing does not occur.
  • the present embodiment it is possible to improve the luminance of each color without causing problems such as saturation reduction and hue shift.
  • the time gap between light sources of the respective colors each color LED
  • the time gap for light emission from the backlight 25 is reduced
  • the display brightness can be improved without increasing the number of light sources (LEDs).
  • the ratio of the amount of display light to be emitted in the white subframe period Tw to the amount of display light of the white component to be emitted in one frame period Tfr for displaying each pixel of the input image that is, the distribution ratio WRs is It is determined by the value of the parameter WRX and is 50% (see step S104 in FIG. 3).
  • the parameter WBR for determining the luminance of the light source 27 in the white subframe period is assumed to be 1. More generally, the value to be set as the distribution ratio WRs is WBR / (1 + WBR).
  • the distribution ratio WRs may be set to a fixed value near 50% (more generally, a fixed value near WBR / (1 + WBR)) by setting the parameter WRX. If the distribution ratio WRs is within a predetermined range near 50%, the response of the liquid crystal is substantially a decay response when switching from the preceding subframe period (red subframe period Tr) to the common color subframe period (white subframe period Tw) Even if the red light source (R-LED) is turned on in the first half of the common color sub-frame period (white sub-frame period Tw) and a color shift occurs, it is within the human visual tolerance.
  • the distribution ratio WRs is within a predetermined range around 50% where color shift can be tolerated by human vision (more generally, within a predetermined range near WBR / (1 + WBR)). It may change according to the saturation or the lightness.
  • a predetermined range around 50% where color shift can be tolerated by human vision more generally, within a predetermined range near WBR / (1 + WBR). It may change according to the saturation or the lightness.
  • the image display apparatus is provided with the distribution ratio WRs not as a fixed value (WRX ⁇ 50%) but as a function that changes according to the saturation S or the lightness, but the other configuration is the first embodiment. It is similar to the form, and has a configuration as shown in FIG. In the following, in the configuration of the image display device according to the present modification, the same reference numerals are given to portions that are the same as or correspond to the configuration of the image display device according to the first embodiment.
  • the distribution ratio WRs as a function of the saturation S will be described as a first example.
  • first distribution ratio WRs1 in order to distinguish the distribution ratio of the first example from the distribution ratio of another example, it is also referred to as “first distribution ratio WRs1”.
  • the saturation S and the distribution ratio WRs take values of 0 or more and 1 or less.
  • the maximum value of the blue, green and red image data Bd, Gd, Rd included in the driving image data D2 is Ddmax, and the minimum value is Ddmin.
  • Wd WRs ⁇ Dmin ⁇ Ks / WBR (6a)
  • Ddmax (Dmax ⁇ WRs ⁇ Dmin) Ks (6b)
  • Ddmin (Dmin-WRs ⁇ Dmin) Ks (6c)
  • the following equation (7a) is derived.
  • FIG. 11 is a graph showing the first distribution ratio WRs1.
  • the latter function is determined such that the graph of the former function and the graph of the latter function are in contact at a point (WBRx, WBRo / (1-WBRx)).
  • the graph shown in FIG. 11 is always in the first area shown in FIG.
  • a distribution ratio WRs which is a function of lightness after amplification and compression, will be described as a second example.
  • Dmax indicates the input lightness Vi
  • V indicates the lightness after the amplification and compression processing (hereinafter also referred to as “adjusted lightness”).
  • the parameter storage unit 11 stores the parameter WRZ in addition to the parameters RA, RB, WRX, and WBR described above, and the statistical value / saturation calculation unit 12 calculates the first distribution ratio WRs1. And the second distribution ratio WRsv2 is calculated using the parameter WRZ.
  • WRsva RA / (RA-1) + (RB-V) / ⁇ (RA-1) V (1-S) ⁇ (27a)
  • WRsvb WBR.RA / (1 + WBR.RA) + WBR.RB / ⁇ (1 + WBR.RA) V (1-S) ⁇ (27b)
  • WRsvc WBR (V-RB) / ⁇ (WBR + RA) V (1-S) ⁇ (27 c)
  • the second distribution ratio WRsv2 When the second distribution ratio WRsv2 is obtained, if (S, WRs1) is in the first area shown in FIG. 4, the second distribution ratio WRsv2 is set to the value WRsva or more shown in the equation (27a). When (S, WRs1) is in the second area shown in FIG. 4, the second distribution ratio WRsv2 is set to the value WRsvb or less shown in the equation (27b). If (S, WRs1) is in the third area shown in FIG. 4, the second distribution ratio WRsv2 is set to the value WRsvc or more shown in the equation (27c).
  • the second distribution ratio WRsv2 takes a value in the range of 0 ⁇ WRsv2 ⁇ 1
  • the second distribution ratio WRsv2 is determined to satisfy the following equation (28). max (0, WRsva, WRsvc) WR WRsv 2 min min (1, WRsvb) (28)
  • FIG. 12 is a diagram for describing a method of determining a function for obtaining the second distribution ratio WRsv2.
  • RA 0.25
  • RB 0.75
  • WBR 0.5
  • WRX 0.75.
  • the distribution ratio / coefficient calculation unit 13 calculates the first distribution ratio WRs1 according to the equations (8a) to (8c), and calculates the coefficient Ks according to the equation (21).
  • a portion surrounded by a thick broken line in FIG. 12 indicates the range of the adjusted brightness (brightness after amplification and compression processing) V and the second distribution ratio WRsv2 that satisfy Expression (28).
  • the function for obtaining the second distribution ratio WRsv2 is determined such that the graph of the function is in the range surrounded by the thick broken line shown in FIG.
  • the second distribution ratio WRsv2 is larger as the adjustment brightness V is smaller. Therefore, in the second example in which the second distribution ratio WRsv2 is set to the distribution ratio WRs to the white subframe, the distribution ratio / coefficient calculating unit 13 obtains a larger distribution ratio WRs as the adjustment brightness V decreases. Therefore, when the adjustment brightness V is small, the color break reduction effect can be increased.
  • the parameter WRZ is set to a value closer to the first distribution ratio WRs1 as the response speed of the pixel 26 is slower, and the parameter WRZ is set to a value closer to 1 as the response speed of the pixel 26 is faster.
  • the parameter WRZ is set to a predetermined value near the first distribution ratio WRs1, for example.
  • the lighting time of the red light source (R-LED) in the white subframe period Tw as the common color subframe period is the time from the light emission control reference time point tecr in the white subframe period Tw to the end point t4 Since the time corresponding to the second half period, ie, the time Ton that can be regarded as the conventional maximum light source lighting time, is longer, the light source 27b in the blue subframe period Tb as the subsequent subframe period is It is preferable to increase the lighting time of In the present embodiment, as described above, the light source 27b (B-LED) is lit in the blue subframe period Tb, not only in the second half period (tecr to t5) but also in the first half period (t4 to tecr). The configuration from the viewpoint of maintaining the white balance is already included (see FIG. 9A).
  • the lighting time of the red light source 27r is longer in the white subframe period Tw and the lighting time of the blue light source 27b (B-LED) is longer in the blue subframe period Tb.
  • the color reproduction range can be expanded by suppressing the reduction in color and the hue shift, and the all display color luminance can be improved.
  • the liquid crystal response becomes a decay response or a rise response when switching from the blue subframe period Tb to the green subframe period Tg depends on the input image data D1. Therefore, in the green subframe period Tg, unlike the white subframe period Tw and the blue subframe period Tb, the light source 27g (G-LED) is not lit in the first half period (before the light emission control reference time point tecr). It is done.
  • each light source is preset with a current to be supplied at the time of lighting so that white balance can be secured without lighting the light source 27g (during a period in which light should not be turned on) (see FIG. 9B) .
  • the current setting for each light source R-LED, G-LED, B-LED
  • the current setting corresponding to the lighting time of each light source shown in (B) is not necessarily required.
  • FIG. 13 is a diagram for explaining the method of compensating for the deviation of the mixed color hue in the present embodiment, and the circle in FIG. 13 shows the color wheel.
  • the hue changes in the circumferential direction
  • "R", “G” and “B” indicate angular positions corresponding to red, green and blue, respectively
  • "C” and “M” , “Y” indicate angular positions corresponding to cyan, magenta and yellow, respectively.
  • the positions in the color wheel of the target color of the cases (1) to (9) shown in FIG. 10 are indicated by “(1)” to “(9)”.
  • the luminance of each color can be improved while suppressing the saturation decrease and the hue shift, but as can be seen from the waveform diagram (waveform of thick dotted line) showing the display operation in FIG. Due to the response characteristics of the liquid crystal, a slight shift occurs in saturation and hue from the target colors of cases (1) to (9).
  • Arrows attached in the vicinity of “(1)” to “(9)” in FIG. 13 indicate the directions of these deviations, that is, the display colors corresponding to the respective target colors of cases (1) to (9) are relevant. It indicates the direction of movement from the chromaticity point of the target color. In FIG.
  • the duty ratio (ratio of lighting time in one frame period) of each of the light sources 27r, 27g, 27b in the primary color subframe period (RGB-SF) and the white subframe period (W-SF) is adjusted. Can maintain the white balance.
  • cases other than the above cases (2), (4) and (7) there may be a case where a shift in saturation occurs in the display color (when an arrow in the radial direction is shown in FIG. 13). There is no deviation. If the movement of the chromaticity point as shown by the arrow in FIG. 13 is within the visual tolerance of human beings, it is not always necessary to perform spectrum setting for compensation of such hue shift for each light source. Absent.
  • the green sub-frame period Tg which is a primary color sub-frame period other than the sub-frame periods (preceding and subsequent sub-frame periods) immediately before and after the common color sub-frame period (white sub-frame period Tw).
  • the light source starts to light at the light emission control reference time point tecr. This means that the light source turns on after the end of the transient state of the liquid crystal response.
  • the white subframe period Tw as the common color subframe period and the blue subframe period Tb as the subsequent subframe period
  • the light emission control reference time point tecr before conventionally, light emission is suppressed from the viewpoint of liquid crystal response characteristics
  • the lighting of the light source is started within the expected time, which is the feature of the first embodiment.
  • the end time of the light emission suppression period from the viewpoint of the response characteristic of the liquid crystal is set so that the maximum light source lighting time is from the light emission control reference time point tecr to the end point of the subframe period.
  • the light emission control reference time point tecr it may be different from such a setting if the color shift and the decrease of the average light emission amount are within the visual range of human vision.
  • the light source 27b (B-LED) is before the light emission control reference time point tecr in the blue subframe period Tb which is a subsequent subframe period of the white subframe period Tw as the common color subframe period. Lighting (not only in the second half period but also in the first half period) (see FIGS. 7 and 9), but instead, at the light emission control reference time point tecr in the blue subframe period Tb, the light source 27b (B -LED) may start lighting (it will be in the lighting state only in the second half period).
  • an image display apparatus having such a configuration will be described as a first modified example of the first embodiment.
  • the light source starts lighting at the light emission control reference time point tecr in the blue sub-frame period Tb, but the other configuration is the same as that of the first embodiment. Therefore, in the configuration of the image display device according to the present modification, the same reference numerals as those in the configuration of the image display device according to the first embodiment denote the same or corresponding parts. 1, 3 and 5).
  • FIG. 15A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 15B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • FIG. 14 (A) is a timing chart and a waveform diagram for describing a display operation in a conventional example (hereinafter referred to as “second conventional example”) corresponding to the present modification
  • second conventional example hereinafter referred to as “second conventional example”
  • FIG. 14 (B) FIG.
  • FIG. 8 is a diagram showing the lighting time of each of the three primary color light sources (R-LED, G-LED, B-LED) in the conventional example 2;
  • the ratio of the lighting time of the three primary color light sources (R-LED, G-LED, B-LED) in one frame period Tfr (TOTAL) is 1: 2 in proportion to the ratio of this modification.
  • the third embodiment differs from the first conventional example in which the ratio is 1: 2/3: 1 in that it is 3: 2/3, but the other points are the same as the first conventional example.
  • each light source 27r, 27g , 27b (R-LED, G-LED, B-LED) are slightly different from the light emission pattern of the first embodiment.
  • the display operation liquid crystal response and LED operation
  • the white subframe period Tw as the common color subframe period
  • the light source 27r of the primary color corresponding to the preceding subframe period Tr. (R-LED) starts to light up before the light emission control reference time point tecr (lights up not only in the second half period of the white subframe period Tw but also in the first half period) (FIG. 9A, FIG. See A).
  • the ratio of the lighting time of the three primary color light sources (R-LED, G-LED, B-LED) for achieving white balance is 1.5: 1: 1.
  • the current values at the time of lighting each of the three primary color light sources are set in advance so that According to such current setting, as understood from the bar graph in FIG. 15B, the emission color of the backlight 25 is slightly shifted from white to red in the white subframe period Tw.
  • the red light source 27r (R-LED) corresponding to the preceding subframe period starts lighting before the light emission control reference time point tecr.
  • the red light source 27r corresponding to the preceding subframe period Tr may start lighting at the light emission control reference time point tecr (it will be in the lighting state only in the second half period).
  • an image display apparatus having such a configuration will be described as a second modification of the first embodiment.
  • the red light source 27r starts lighting at the light emission control reference time point tecr in the white subframe period Tw, but the other configuration is the same as that of the first embodiment. Therefore, in the configuration of the image display device according to the present modification, the same reference numerals as those in the configuration of the image display device according to the first embodiment denote the same or corresponding parts. 1, 3 and 5).
  • FIG. 17A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 17B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • FIG. 16 (A) is a timing chart and waveform chart for explaining the display operation in the conventional example (hereinafter referred to as “third prior art”) corresponding to the present modification
  • FIG. 8 is a diagram showing the lighting time of each of the three primary color light sources (R-LED, G-LED, B-LED) in the conventional example 3;
  • the ratio of the lighting time of the three primary color light sources (R-LED, G-LED, B-LED) in one frame period Tfr (TOTAL) is 2/3 in accordance with the ratio of this modified example:
  • the second conventional example differs from the first conventional example in that it is 2/3: 1, but the other points are the same as the first conventional example.
  • the display operation (liquid crystal response and LED operation) is substantially the same as in the first embodiment, and in the blue subframe period Tb as the subsequent subframe period (subframe period immediately after the white subframe period Tw),
  • the light source 27b (B-LED) starts to light up before the light emission control reference time point tecr (the light is on in the first half period as well as the second half period of the blue subframe period Tb) (FIG. 9A, FIG. 17 (A)).
  • the ratio of the lighting time of the three primary color light sources (R-LED, G-LED, B-LED) for achieving white balance is 1: 1: 1.5.
  • the current values at the time of lighting each of the three primary color light sources are set in advance so that According to such current setting, as understood from the bar graph in FIG. 17B, the emission color of the backlight 25 is slightly shifted from white to yellow in the white subframe period Tw.
  • FIG. 19A is a timing chart and waveform chart for explaining the display operation in the present embodiment
  • FIG. 19B is a three primary color light source (R-LED, G-LED, B in the present embodiment).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • FIG. 18A is a timing chart and waveform chart for explaining the display operation in the conventional example corresponding to the present embodiment
  • FIG. 19B is a three primary color light source (R-LED in this conventional example).
  • G-LED, B-LED is a diagram showing the lighting time of each.
  • This prior art example is the same as the first prior art example shown in FIG.
  • the red light source 27r (R-LED) corresponding to the preceding subframe period starts lighting before the light emission control reference time point tecr. (Not only in the second half period but also in the first half period) (see FIGS. 7 and 9).
  • the red light source 27r (R-LED) corresponding to the preceding subframe period Tr lights up at the light emission control reference time point tecr. Start (become lit only in the second half period).
  • the lighting time of the red light source (R-LED) in the white subframe period Tw is the time from the light emission control reference time point tecr in the white subframe period Tw to the end point t4 (white subframe period Length of lighting time of other light source (green light source or blue light source) other than red light source at Tw, or length of lighting time of red light source at white subframe period Tw in the conventional example),
  • the lighting time of the blue light source 27b (B-LED) in the subsequent subframe period Tb has a length corresponding to the lighting time of the red light source in the white subframe period Tw (FIGS. 8 and 9). reference).
  • the lighting time in each subframe period of the green light source 27g (G-LED) corresponding to the primary color subframe period Tg other than the preceding and succeeding subframe periods is white based on the time difference.
  • the length corresponds to the lighting time of the red light source 27r in the subframe period Tw (see FIGS. 8 and 9).
  • the lighting time of the blue light source 27b (B-LED) and the green light source 27g (G-LED) does not increase as described above, and the lighting time of these is similar to that of the conventional example (see FIG. 18, see FIG. 19).
  • the backlight drive circuit 23 in the present embodiment is configured such that the three primary color light sources (R-LED, G-LED, B-LED) of the backlight 25 operate as described above, but other components in the present embodiment
  • the configuration of is the same as that of the first embodiment. Therefore, in the configuration of the image display device according to the present embodiment, the same reference numerals as those in the configuration of the image display device according to the first embodiment denote the same or corresponding parts. 1, 3 and 5).
  • the current value at the time of lighting of each of the three primary color light sources is preset so that 1: 2/3: 1. According to such current setting, as understood from the bar graph in FIG. 19B, the emission color of the backlight 25 is slightly shifted from white to red in the white subframe period Tw.
  • the red light source 27r (R-LED) is turned on only in the second half period (tecr to t4) in the white subframe period Tw, and the green light source in one frame period Tfr.
  • the lighting time of (G-LED) does not increase and is the same as the first conventional example (see FIG. 18).
  • the light source 27b (B-LED) is not lit at the start point of the blue subframe period Tb, but is lit at time t41 earlier than the light emission control reference time point tecr.
  • the green light source 27g (G-LED) is continuously driven in the lighting period (tecr to t2) in the green subframe period Tg, and the white subframe period is In the lighting period (tecr to t4) at Tw, driving is performed by the pulse width modulation method.
  • the blue light source 27b (B-LED) is also driven continuously in the lighting period (t41 to t5) in the blue subframe period Tb, and driven by the pulse width modulation method in the lighting period (tecr to t4) in the white subframe period Tw. Be done.
  • the time during which the green sub-frame period Tg is on is longer than the time during which the white sub-frame period Tw is on, and the blue light source 27b (B-LED)
  • the single-color luminance can be improved without changing the white luminance, so that the white luminance in the image represented by the input image data D1 is set to the single-color luminance. It is suitable when it becomes large with respect to.
  • the light emission pattern of each light source 27r, 27g, 27b (R-LED, G-LED, B-LED) is different from the light emission pattern of the first embodiment, the display operation (liquid crystal response and LED operation) Is similar to that of the first embodiment, and basically the same effect as that of the first embodiment can be obtained.
  • the three primary color light sources (R-LED, G-LED, B-LED) are lit in the entire second half period (tecr to t4) in the white subframe period Tw as the common color subframe period. It is in the state.
  • the green light source (G-LED) and the blue light source (B-LED) are driven by the pulse width modulation method in the second half period (tecr to t4) so that the lighting time in one frame period Tfr does not increase ( 19 (A)).
  • FIG. 20A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 20B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to driving of the backlight 25 in the present modification is the same as that of the first and second embodiments.
  • the lighting time of the green light source (G-LED) in one frame period Tfr does not increase as in the second embodiment (the conventional example shown in FIG. As well).
  • the green light source 27g (G-LED) and the blue light source 27b (B-LED) are in the white subframe period Tw.
  • the white subframe period Tw is continuously driven in a predetermined period in contact with the end point t4 of the white subframe period Tw.
  • the green light source 27g and the blue light source 27b start lighting at time t31 after the light emission control reference time point tecr, and continuously from time t31 to the end point t4 of the white sub-frame period Tw. It lights up.
  • the other operations of the three primary color light sources are the same as in the second embodiment.
  • FIG. 21A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 21B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to driving of the backlight 25 in the present modification is the same as that of the first and second embodiments.
  • the lighting time of the green light source (G-LED) in one frame period Tfr does not increase (the conventional example shown in FIG. 18 and the prior art) As well).
  • the green light source 27g (G-LED) and the blue light source 27b (B-LED) are in the white subframe period Tw.
  • the white subframe period Tw is continuously driven in a predetermined period in contact with the end point t4 of the white subframe period Tw.
  • the present modification is the same as the first modification of the second embodiment (see FIG. 20). However, as shown in FIG.
  • the red light source 27r (R-LED) is on in the white subframe period Tw.
  • a certain period is divided into a first period (t3 to t31) and a second period (t32 to t4) respectively contacting the start point t3 and the end point t4 of the white subframe period Tw.
  • the red light source 27r is astigmatic from the end point t31 of the first period to the start point t32 of the second period.
  • the other operations of the three primary color light sources (R-LED, G-LED, B-LED) are the same as in the second embodiment.
  • the lighting of the red light source 27r in the white subframe period Tw is performed so that the white color contributing to the reduction of color break in the luminescent color obtained in the white subframe period Tw does not change with respect to white in white display.
  • the periods can be separated into a first period and a second period (see the lower bar in FIG. 21B).
  • the red luminance (monochromatic luminance) as a primary color corresponding to the red subframe period Tr which is the preceding subframe period is further added. It can be improved.
  • FIG. 23A is a timing chart and waveform chart for explaining the display operation in this embodiment
  • FIG. 23B is a three primary color light source (R-LED, G-LED, B in this embodiment).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • FIG. 22 (A) is a timing chart and waveform chart for explaining the display operation in the conventional example corresponding to the present embodiment
  • FIG. 22 (B) is a three primary color light source (R-LED in this conventional example).
  • G-LED, B-LED is a diagram showing the lighting time of each.
  • This prior art example is the same as the first prior art example shown in FIGS.
  • the red light source 27r (R-LED) corresponding to the preceding subframe period starts lighting at the light emission control reference time point tecr, and From the start point t3 of the white subframe period Tw to the light emission control reference time point tecr (first half period), the light is not lit (see FIG. 19).
  • the red light source (R-LED) corresponding to the preceding subframe period Tr receives the light emission control reference time from its start point t3.
  • the other operations of the three primary color light sources (R-LED, G-LED, B-LED) of the backlight 25 in the present embodiment are the same as those of the second embodiment, and each light source in one frame period Tfr ( The lighting time of the R-LED, G-LED, and B-LED is the same as that of the conventional example without increasing.
  • the second embodiment is also the same as the second embodiment (see FIGS. 22 and 23). Further, as shown in FIG.
  • the backlight drive circuit 23 in the present embodiment is configured such that the three primary color light sources (R-LED, G-LED, B-LED) of the backlight 25 operate as described above, but other light sources in the present embodiment
  • the configuration is the same as that of the first and second embodiments. Therefore, in the configuration of the image display device according to the present embodiment, the same reference numerals as those in the configuration of the image display device according to the first and second embodiments denote the same or corresponding parts. It abbreviates (refer to Drawing 1, Drawing 3, and Drawing 5).
  • the lighting period of the red light source 27r (R-LED) corresponding to the preceding subframe period is the first half period
  • the lighting periods of the green light source 27g (G-LED) and the blue light source 27b (B-LED) are only the second half period (tecr to t4). For this reason, the chromaticity point of the common color contributing to the reduction of the color break is shifted from the white in the white display to the cyan direction.
  • the single-color luminance (red Luminance) can be further improved.
  • the single-color luminance can be improved without changing the white luminance, so that in the image represented by the input image data D1, the white luminance is the single-color luminance. It is suitable when it becomes large.
  • each light source 27r, 27g, 27b R-LED, G-LED, B-LED
  • the display operation liquid crystal response and LED operation
  • the green light source 27g (G-LED) and the blue light source (B-LED) are turned on in the entire second half period (tecr to t4) in the white subframe period Tw as the common color subframe period. Although it is in the state, it is driven by the pulse width modulation method in the second half period (tecr to t4) so that the lighting time in one frame period Tfr does not increase (see FIG. 23A).
  • FIG. 24A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 24B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to driving of the backlight 25 in the present modification is the same as that of the first and second embodiments.
  • the green light source 27g (G-LED) and the blue light source 27b (B-LED) are pulsed in the white subframe period Tw. It is not driven by the width modulation method, but is continuously driven in a predetermined period in contact with the end point t4 of the white subframe period Tw. That is, in the white sub-frame period Tw, the green light source 27g (G-LED) and the blue light source 27b (B-LED) start lighting at time t31 after the light emission control reference time point tecr. The lighting state continues until the end point t4 of the frame period Tw.
  • the other operations of the three primary color light sources (R-LED, G-LED, B-LED) are the same as in the third embodiment.
  • the lighting period of the red light source 27r (R-LED) corresponding to the preceding subframe period is the first half period (
  • the lighting period of the green light source 27g (G-LED) and the blue light source 27b (B-LED) is only the period (t31 to t4) close to the end point in the second half period. For this reason, the chromaticity point of the common color contributing to the reduction of the color break is shifted from the white in the white display to the cyan direction.
  • the lighting periods of the light sources (R-LED, G-LED, B-LED) in the white subframe period Tw are arranged as described above,
  • the single-color luminance can be further improved while achieving the same effect as that of the embodiment.
  • FIG. 26A is a timing chart and waveform chart for explaining the display operation in the present embodiment
  • FIG. 26B is a three primary color light source (R-LED, G-LED, B in the present embodiment).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • FIG. 25 (A) is a timing chart and waveform chart for explaining the display operation in the conventional example corresponding to the present modification
  • FIG. 25 (B) is a three primary color light source (R-LED in this conventional example).
  • G-LED, B-LED is a diagram showing the lighting time of each.
  • This prior art example is the same as the first prior art example shown in FIG. 8, FIG. 18 and FIG.
  • the blue light source 27b (B-LED) corresponding to the subsequent subframe period lights up at the light emission control reference time point tecr.
  • the light emission state is started until the end point t4 of the white subframe period Tw is started (see FIG. 9, FIG. 19, and FIG. 23).
  • the blue light source (B-LED) is not turned on in the white subframe period Tw, and only in the blue subframe period Tb which is the subsequent subframe period. It is lit.
  • the other operations of the three primary color light sources (R-LED, G-LED, B-LED) of the backlight 25 in the present embodiment are substantially the same as those in the second embodiment, and one operation is performed in one frame period Tfr.
  • the point of the lighting time of each light source (R-LED, G-LED, B-LED) is the same as that of the conventional example without any increase, which is also the same as the twelfth embodiment (see FIGS. 25 and 26).
  • FIG. 26B also in this embodiment, as in the second and third embodiments, three primary color light sources (R ⁇ ) in one frame period Tfr (TOTAL) for achieving white balance.
  • the current value at the time of lighting of each of the three primary color light sources is preset so that the ratio of the lighting time of LED, G-LED, B-LED) is 1: 2/3: 1.
  • the backlight drive circuit 23 in the present embodiment is configured such that the three primary color light sources (R-LED, G-LED, B-LED) of the backlight 25 operate as described above, but other light sources in the present embodiment
  • the configuration is the same as that of the first to third embodiments. Therefore, in the configuration of the image display device according to the present embodiment, the same reference numerals as those in the configuration of the image display device according to the first to third embodiments denote the same or corresponding parts. It abbreviates (refer to Drawing 1, Drawing 3, and Drawing 5).
  • the blue light source 27b (B-LED) corresponding to the blue subframe period Tb as a subsequent subframe period is a white subframe period Tw as a common color subframe period. In this case, it does not turn on, but turns on only in the blue subframe period Tb.
  • the blue light source 27b is in the lighting state in the entire blue sub-frame period Tb (t4 to t5). Therefore, the emission color of the backlight 25 is shifted from white in white display to orange in the white subframe period Tw.
  • the present embodiment since the lighting periods of the respective light sources (R-LED, G-LED, B-LED) are arranged as described above in each frame period Tfr, the white luminance is changed. It is possible to improve single-color luminance without For this reason, in the case where amplification processing is performed on the input image data D1 using the adjustment coefficient Ks, the present embodiment is particularly effective when the white luminance becomes larger than the single luminance.
  • the display operation liquid crystal response and LED operation
  • the green light source 27g (G-LED) is lit in the entire second half period (tecr to t4) in the white subframe period Tw as the common color subframe period, but one frame Driving is performed by the pulse width modulation method in the second half period (tecr to t4) so that the lighting time in the period Tfr does not increase (see FIG. 26A).
  • FIG. 27A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 27B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to the driving of the backlight 25 in this modification is the same as that of the first to fourth embodiments.
  • the green light source 27g (G-LED) is driven by the pulse width modulation method in the white subframe period Tw. Instead, the white subframe period Tw is continuously driven in a predetermined period in contact with the end point t4. That is, in the white subframe period Tw, the green light source 27g starts lighting at time t31 after the light emission control reference time point tecr, and is continuously lit from time t31 to the end point t4 of the white subframe period Tw. .
  • the other operations of the three primary color light sources (R-LED, G-LED, B-LED) are the same as in the fourth embodiment.
  • the lighting period of the red light source 27r (R-LED) corresponding to the preceding subframe period is the second half period (
  • the lighting period of the green light source 27g (G-LED) is only the period (t31 to t4) close to the end point in the second half period. Therefore, in the white subframe period Tw, the light emission color of the backlight 25 is shifted from white in the white display to the orange direction.
  • the fourth embodiment since the lighting periods of the light sources (R-LED, G-LED, B-LED) in each frame period Tfr are arranged as described above, the fourth embodiment is preferable. It is possible to further improve single-color luminance while achieving the same effect as that of the embodiment.
  • the red light source 27r in the white subframe period Tw as the common color subframe period, the red light source 27r (R-LED) is in the first half period (t3 to tecr) and in the second half period (tecr to t4) in the non-lighting state.
  • the green light source 27g is also lit only in the second half period (tecr to t4), but the second half period (G-LED) does not increase the lighting time in one frame period Tfr. It is driven by pulse width modulation at tecr to t4) (see FIG. 26A).
  • FIG. 28A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 28B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to the driving of the backlight 25 in this modification is the same as that of the first to fourth embodiments.
  • the lighting time of the green light source (G-LED) in one frame period Tfr does not increase as in the second to fourth embodiments (FIG. 18, FIG. 25 and so forth).
  • the green light source 27g (G-LED) is driven by the pulse width modulation method in the white subframe period Tw.
  • the white subframe period Tw is continuously driven in a predetermined period in contact with the end point t4 of the white subframe period Tw.
  • the present modification is the same as the first modification of the fourth embodiment (see FIG. 27).
  • FIG. 27 the first modification of the fourth embodiment
  • the lighting period of the red light source 27r is in the white subframe period Tw.
  • the white subframe period Tw is separated into a first period (t3 to t31) and a second period (t32 to t4) respectively in contact with the start point t3 and the end point t4.
  • the red light source 27r is astigmatic from the end point t31 of the first period to the start point t32 of the second period. From this, the chromaticity point of the common color contributing to the reduction of color break shifts from white to yellow in white display.
  • the other operations of the three primary color light sources are the same as in the fourth embodiment.
  • the lighting period of the red light source 27r in the white subframe period Tw is separated into the first period and the second period without shifting the chromaticity point of white obtained as the emission color in the white subframe period Tw. It is also possible to do (see FIG. 28B).
  • the red light source 27r in the white subframe period Tw as the common color subframe period, the red light source 27r (R-LED) is in the first half period (t3 to tecr) and in the second half period (tecr to t4) in the non-lighting state.
  • the green light source 27g is also lit only in the second half period (tecr to t4), but the second half period (G-LED) does not increase the lighting time in one frame period Tfr. It is driven by pulse width modulation at tecr to t4) (see FIG. 26A).
  • FIG. 29A is a timing chart and waveform chart for explaining the display operation in this modification
  • FIG. 29B is a three primary color light source (R-LED, G-LED, B in this modification).
  • -LED It is a figure which shows each lighting time and light-emission quantity.
  • the configuration other than the configuration relating to the driving of the backlight 25 in this modification is the same as that of the first to fourth embodiments.
  • the lighting time of the green light source (G-LED) in one frame period Tfr does not increase as in the second to fourth embodiments (FIG. 18, FIG. 25 and so forth).
  • the green light source 27g (G-LED) is driven by the pulse width modulation method in the white subframe period Tw.
  • the white subframe period Tw is continuously driven in a predetermined period in contact with the end point t4 of the white subframe period Tw.
  • the present modification is the same as the first modification of the fourth embodiment (see FIG. 27).
  • FIG. 27 the first modification of the fourth embodiment
  • the red light source 27r (R-LED) is in the first half in the white subframe period Tw. In the period (t3 to tecr), the light is on, and in the second half period (tecr to t4), the light is off.
  • the subframe period immediately before the white subframe period Tw (preceding subframe period) as the common color subframe period is the red subframe period Tr, and the immediately following subframe period (following subframe period) Is the blue sub-frame period Tb, and the sub-frame period except immediately before and after the common color sub-frame period is the green sub-frame period Tg (see FIG. 7 and FIG. 9).
  • the order of Tg, Tb and Tw is not limited to this. Different from the above depending on the characteristics of each light source 27r, 27g, 27b (forward voltage VF and emission spectrum of R-LED, G-LED, B-LED, etc.), type (use of phosphor etc.), current etc. In some cases it may be preferable to take order.
  • each frame period is a blue, green, red primary color subframe period and a white subframe period as a common color subframe period (a white subframe which is a blue, green, blue common color) And sub-frame periods of other primary colors and common-color sub-frame periods.
  • the “common color” is basically a color including all the color components of the primary colors corresponding to the primary color sub-frame period in each frame period, and the ratio of these color components is not limited. I assume.
  • a common color sub-frame corresponding to another color composed of two primary colors instead of the white sub-frame period as a common color sub-frame period A period (eg, a yellow subframe period consisting of red and green) may be used.
  • any color other than black such as “yellow-green”, “red” or “red half of brightness” instead of “white” or “yellow” corresponds to the common color subframe period
  • the distribution ratio WRs and the adjustment coefficient Ks have been described not only in the case of fixed values but also in the case where the distribution ratio WRs and the adjustment coefficient Ks are obtained according to a specific formula.
  • Calculation formulas for obtaining the coefficient Ks may be other than those described above.
  • a conventionally known calculation formula may be used as a calculation formula for determining the distribution ratio WRs.
  • the liquid crystal panel 24 that transmits light from the backlight 25 as a light source unit is used as a display device, and an image is displayed by controlling the transmittance of the liquid crystal panel 24.
  • the present invention is not limited to a field sequential display using a transmissive light modulator such as the liquid crystal panel 24, but can be applied to a field sequential display using a reflective light modulator.
  • the present invention can be applied to a field sequential type projection display apparatus using a reflective liquid crystal panel called LCOS (Liquid Crystal On Silicon) as a light modulator.
  • LCOS Liquid Crystal On Silicon
  • the present invention can also be applied to field sequential type image display devices other than liquid crystal display devices, for example, self-luminous type image display devices such as organic EL (ElectroLuminescence) display devices. Furthermore, the present invention can also be applied to a see-through image display device or the like having a function of making the back of the display panel visible.
  • field sequential type image display devices other than liquid crystal display devices
  • self-luminous type image display devices such as organic EL (ElectroLuminescence) display devices.
  • the present invention can also be applied to a see-through image display device or the like having a function of making the back of the display panel visible.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention concerne un appareil d'affichage d'image à séquence de champs qui est capable de réduire une dégradation de saturation ou un écart de teinte causés par une couleur mélangée même si un dispositif d'affichage ayant une réponse optique rapide n'est pas utilisé. Dans l'appareil d'affichage d'image à séquence de champs dans lequel chaque période de trame inclut des périodes de sous-trame verte, rouge, blanche et bleue : le rapport d'attribution à la période de sous-trame blanche est réglé sur 50 % et des données d'image d'entrée de rouge, vert et bleu sont converties en des données d'image de commande de rouge, vert, bleu et blanc; et un panneau à cristaux liquides est commandé sur la base des données d'image de commande. Un rétroéclairage est commandé de sorte que des sources de lumière (G-LED) et (R-LED) sont toutes deux allumées uniquement dans les deuxièmes moitiés des périodes de sous-trames vertes et rouges (Tg, Tr), de sorte que, dans la période de sous-trame blanche (Tw), la source de lumière (R-LED) correspondant à une période de sous-trame immédiatement précédente est allumée dans la première/deuxième moitié et (G-LED) et (B-LED) sont allumées uniquement dans la deuxième moitié, et de sorte que (B-LED) est allumée dans la première/deuxième moitié de la période de sous-trame bleue (Tb) immédiatement après.
PCT/JP2018/023769 2017-06-29 2018-06-22 Appareil d'affichage d'images à séquence de champs et procédé d'affichage d'image Ceased WO2019004072A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017-127361 2017-06-29
JP2017127361 2017-06-29

Publications (1)

Publication Number Publication Date
WO2019004072A1 true WO2019004072A1 (fr) 2019-01-03

Family

ID=64741958

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/023769 Ceased WO2019004072A1 (fr) 2017-06-29 2018-06-22 Appareil d'affichage d'images à séquence de champs et procédé d'affichage d'image

Country Status (1)

Country Link
WO (1) WO2019004072A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113314085A (zh) * 2021-06-15 2021-08-27 武汉华星光电技术有限公司 显示面板的显示方法及显示装置
CN118485741A (zh) * 2023-11-08 2024-08-13 荣耀终端有限公司 一种图片显示方法及电子设备
CN118575216A (zh) * 2022-12-30 2024-08-30 京东方科技集团股份有限公司 液晶显示面板、图像显示方法、电子设备及可读存储介质

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090091525A1 (en) * 2007-10-03 2009-04-09 Au Optronics Corporation Backlight Driving Method
WO2009044909A1 (fr) * 2007-10-04 2009-04-09 Nec Display Solutions, Ltd. Dispositif d'affichage vidéo et son procédé de commande de source lumineuse
JP2010107579A (ja) * 2008-10-28 2010-05-13 Seiko Epson Corp 駆動方法および電気光学装置
JP2012053256A (ja) * 2010-09-01 2012-03-15 Sony Corp 画像表示装置の駆動方法
JP2013057717A (ja) * 2011-09-07 2013-03-28 Casio Comput Co Ltd 投影装置、投影方法及びプログラム
JP2015082024A (ja) * 2013-10-22 2015-04-27 株式会社ジャパンディスプレイ 表示装置、表示装置の駆動方法及び電子機器
WO2015087598A1 (fr) * 2013-12-09 2015-06-18 シャープ株式会社 Dispositif d'affichage d'image et son procédé de pilotage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090091525A1 (en) * 2007-10-03 2009-04-09 Au Optronics Corporation Backlight Driving Method
WO2009044909A1 (fr) * 2007-10-04 2009-04-09 Nec Display Solutions, Ltd. Dispositif d'affichage vidéo et son procédé de commande de source lumineuse
JP2010107579A (ja) * 2008-10-28 2010-05-13 Seiko Epson Corp 駆動方法および電気光学装置
JP2012053256A (ja) * 2010-09-01 2012-03-15 Sony Corp 画像表示装置の駆動方法
JP2013057717A (ja) * 2011-09-07 2013-03-28 Casio Comput Co Ltd 投影装置、投影方法及びプログラム
JP2015082024A (ja) * 2013-10-22 2015-04-27 株式会社ジャパンディスプレイ 表示装置、表示装置の駆動方法及び電子機器
WO2015087598A1 (fr) * 2013-12-09 2015-06-18 シャープ株式会社 Dispositif d'affichage d'image et son procédé de pilotage

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113314085A (zh) * 2021-06-15 2021-08-27 武汉华星光电技术有限公司 显示面板的显示方法及显示装置
CN113314085B (zh) * 2021-06-15 2022-09-27 武汉华星光电技术有限公司 显示面板的显示方法及显示装置
US11955096B2 (en) 2021-06-15 2024-04-09 Wuhan China Star Optoelectronics Technology Co., Ltd. Display method of display panel, display device, and server
CN118575216A (zh) * 2022-12-30 2024-08-30 京东方科技集团股份有限公司 液晶显示面板、图像显示方法、电子设备及可读存储介质
CN118485741A (zh) * 2023-11-08 2024-08-13 荣耀终端有限公司 一种图片显示方法及电子设备

Similar Documents

Publication Publication Date Title
CN100447850C (zh) 场序制液晶显示器中的背光驱动电路
CN103531157B (zh) 宽色域显示器
US8558781B2 (en) Color sequential display where each sub-frame is illuminated by a secondary color backlight followed by illumination with the complementary primary color backlight
TW201914003A (zh) 微發光二極體裝置及陣列之顯示最佳化技術
JP6239552B2 (ja) 液晶表示装置
US9363872B2 (en) Display device and method of controlling light source
JP2004004626A (ja) 表示装置
JP2011022481A (ja) 液晶表示装置
JP2007322944A (ja) 表示制御装置、表示装置及び表示制御方法
WO2011036916A1 (fr) Dispositif d'affichage et procédé d'affichage pour celui-ci
US20180240418A1 (en) Color image display device and color image display method
JP5438217B2 (ja) 表示信号発生器、表示装置、及び画像表示方法
US20100117942A1 (en) Liquid crystal display
JP2012047827A (ja) 画像表示装置
KR101252089B1 (ko) 액정 표시 장치
JP2007322945A (ja) 表示制御装置、表示装置及び表示制御方法
US20180157120A1 (en) Backlight device and liquid crystal display device provided therewith
JP2010128072A (ja) バックライト駆動装置及びバックライト駆動制御方法
WO2019004072A1 (fr) Appareil d'affichage d'images à séquence de champs et procédé d'affichage d'image
WO2016103922A1 (fr) Dispositif d'affichage d'image en couleurs, et procédé d'affichage d'image en couleurs
US10706792B2 (en) Field sequential type display device and display method
WO2023188730A1 (fr) Dispositif électroluminescent et procédé d'excitation de dispositif électroluminescent
US10083660B2 (en) Liquid-crystal display device and liquid-crystal display device control method
JP2007334223A (ja) 液晶表示装置
US10545374B2 (en) Light source control apparatus, light source control method and display device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18825056

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18825056

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP