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WO2021167179A1 - Dispositif d'affichage et procédé de commande pour dispositif d'affichage - Google Patents

Dispositif d'affichage et procédé de commande pour dispositif d'affichage Download PDF

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Publication number
WO2021167179A1
WO2021167179A1 PCT/KR2020/008498 KR2020008498W WO2021167179A1 WO 2021167179 A1 WO2021167179 A1 WO 2021167179A1 KR 2020008498 W KR2020008498 W KR 2020008498W WO 2021167179 A1 WO2021167179 A1 WO 2021167179A1
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WIPO (PCT)
Prior art keywords
light emitting
voltage
emitting devices
display module
driving
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/KR2020/008498
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English (en)
Korean (ko)
Inventor
여용훈
현병철
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
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Publication of WO2021167179A1 publication Critical patent/WO2021167179A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3216—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using a passive matrix
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2074—Display of intermediate tones using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/028—Generation of voltages supplied to electrode drivers in a matrix display other than LCD

Definitions

  • the present disclosure relates to a display device and a method for controlling the display device, and more particularly, to a passive matrix (PM) type display device in which a self-luminous element constitutes a pixel, and a method for controlling the display device.
  • PM passive matrix
  • a self-luminous device for example, an organic light emitting diode (OLED), an inorganic light emitting diode (LED), etc.
  • OLED organic light emitting diode
  • LED inorganic light emitting diode
  • the LED is located between the anode terminal and the cathode terminal in the forward direction of the LED. It emits light when a voltage higher than the forward voltage is applied.
  • FIG. 1A shows an LED 1 constituting one sub-pixel in an LED display.
  • Vf forward voltage
  • the forward voltage between the LEDs is different for each type of LED.
  • the forward voltage of a red (R) LED is significantly lower than that of a green (G) or blue (B) LED.
  • Figure 1b shows this.
  • LED displays are generally designed with a common anode structure in many cases.
  • the anode voltage of the same voltage is applied to the R, G, and B LEDs, the anode voltage is set based on the LED having the highest forward voltage among the LED types.
  • An object of the present disclosure is to provide a display device capable of reducing power consumption caused by a difference in forward voltage according to types of LEDs in an LED display having a common anode structure and a method for controlling the display device.
  • a display device for achieving the above object includes a display module in which pixels including a plurality of light emitting devices of different colors are arranged in a matrix form, and a driving voltage and a driving current to the display module
  • the driving voltage is sequentially applied in units of the row lines to the driving unit for driving the display module by applying to the light emitting devices included in the display module and the light emitting devices included in the pixels arranged on each row line in the display module, and a processor for controlling the driving unit so that the driving current having a pulse width based on a grayscale value is applied to each of the plurality of light emitting devices of different colors included in pixels disposed on a row line to which the driving voltage is applied; and the driving voltage includes a plurality of voltages having different magnitudes based on the colors of the plurality of light emitting devices.
  • the driving voltage is a first voltage applied to a light emitting device of a color having a relatively low forward voltage among a plurality of light emitting devices of different colors and a first voltage applied to a light emitting device of a color having a relatively high forward voltage It may contain two voltages.
  • the plurality of light emitting devices of different colors include a red (R) LED, a green (G) LED, and a blue (B) LED, and the first voltage is applied to the R LED, and the second A voltage may be applied to the G and B LEDs.
  • the processor may include R LEDs included in pixels disposed in one row line of the display module.
  • the driving unit is controlled so that the driving current is applied to each of the pixels, and while the second voltage is applied to the light emitting devices included in the pixels arranged in the one row line, the pixels arranged on the one row line It is possible to control the driving unit so that the driving current is applied to each of the G and B LEDs included in the LEDs.
  • first and second voltages may be temporally continuous voltages.
  • the processor converts the grayscale value of the input image into the grayscale value of the display module, and the converted grayscale value of all light emitting devices included in the display module is a predetermined value based on the maximum grayscale value of the display module
  • the driving voltage including the first voltage and the second voltage is sequentially applied to the light emitting devices included in the pixels disposed in each row line in units of the row line, and among all the light emitting devices
  • the driving voltage of the second voltage is sequentially applied to the light emitting devices included in the pixels disposed in each row line in units of the row lines. It is possible to control the driving unit to be applied.
  • the processor converts the grayscale value of the input image into the grayscale value of the display module, and includes first among the converted grayscale values of all the light emitting devices included in the display module to which the first voltage is applied. A maximum grayscale value and a second maximum grayscale value of the light emitting devices to which the second voltage is applied are checked, and when the sum of the checked first and second maximum grayscale values is equal to or less than the maximum grayscale value of the display module, the first and a ratio of a time for which the first and second voltages are applied within a time for which the driving voltage is applied based on the ratio of the second maximum grayscale value.
  • anode terminals of light emitting devices included in pixels disposed in the same row line are commonly connected to each other, and cathode terminals of light emitting devices included in pixels disposed in the same column line are connected to each other.
  • Each color can be connected in common.
  • the driving unit is provided for each row line, and the driving voltage is applied to one end of each of a plurality of switches and the other end is connected to the common connected anode terminal and the driving current is sinked for each common cathode terminal.
  • a current sink circuit wherein the processor sequentially turns on the plurality of switches so that the driving voltage is sequentially applied in units of the row lines, and emits light included in pixels disposed on a row line corresponding to the turned on switch
  • the current sink circuit may be controlled so that the driving current flows to the devices.
  • the display module in the method of controlling a display device including a display module in which pixels including a plurality of light emitting devices of different colors are disposed in a matrix form, the display module is disposed on each row line sequentially applying a driving voltage to the light emitting devices included in the selected pixels in units of the row line; and applying, respectively, a driving current having a pulse width based on a grayscale value, wherein the driving voltage includes a plurality of voltages having different magnitudes based on colors of the plurality of light emitting devices.
  • the driving voltage is a first voltage applied to a light emitting device of a color having a relatively low forward voltage among a plurality of light emitting devices of different colors and a first voltage applied to a light emitting device of a color having a relatively high forward voltage It may contain two voltages.
  • the plurality of light emitting devices of different colors include a red (R) LED, a green (G) LED, and a blue (B) LED, wherein the first voltage is applied to the R LED, and the second A voltage may be applied to the G and B LEDs.
  • the applying of the driving current may include, while the first voltage is applied to the light emitting devices included in the pixels arranged in one row line of the display module, the pixels arranged in the one row line.
  • the method may include applying the driving current to each of the G and B LEDs included in the pixels.
  • first and second voltages may be temporally continuous voltages.
  • converting the grayscale value of the input image into the grayscale value of the display module when the converted grayscale value of all light emitting devices included in the display module is less than or equal to a certain value based on the maximum grayscale value of the display module, sequentially applying the driving voltage including the first voltage and the second voltage to light emitting devices included in pixels disposed in each row line in units of the row line, and among all the light emitting devices
  • the driving voltage of the second voltage is sequentially applied to the light emitting devices included in the pixels disposed on the row lines in units of the row lines. It may include the step of applying.
  • the first and The method may include adjusting a ratio of a time for which the first and second voltages are applied within a time for which the driving voltage is applied based on a ratio of the second maximum grayscale value.
  • anode terminals of light emitting devices included in pixels disposed in the same row line are commonly connected to each other, and cathode terminals of light emitting devices included in pixels disposed in the same column line are connected to each other.
  • Each color can be connected in common.
  • the display device is provided for each row line, and the driving voltage is applied to one end of each of a plurality of switches and the other end is connected to the commonly connected anode terminal and the driving current sinks for each common cathode terminal. and a current sink circuit that becomes and controlling the current sink circuit so that the driving current flows to light emitting devices included in pixels disposed on a row line corresponding to .
  • 1A is a diagram illustrating an LED constituting one sub-pixel in an LED display
  • Figure 1b is a diagram showing the forward voltage according to the type of LED
  • Figure 1c is a view showing the surplus voltage according to the type of LED in the common anode structure
  • FIG. 2 is a block diagram of a display device according to an embodiment of the present disclosure
  • 3A is a view showing a display module according to an embodiment of the present disclosure.
  • 3B is a view showing a display module according to another embodiment of the present disclosure.
  • 4A is a diagram illustrating a pixel structure of a display module according to an embodiment of the present disclosure
  • 4B is a diagram illustrating a pixel structure of a display module according to an embodiment of the present disclosure
  • FIG. 5 is a view showing the structure of a display module according to an embodiment of the present disclosure.
  • 6A is a view showing a display module including a plurality of LED blocks according to an embodiment of the present disclosure
  • 6B is a view for explaining an LED driver according to an embodiment of the present disclosure.
  • FIG. 7A is a view for explaining a method of driving a display module according to an embodiment of the present disclosure
  • FIG. 7B is a view for explaining a method of driving a display module according to an embodiment of the present disclosure.
  • 7C is a view for explaining a method of driving a display module according to an embodiment of the present disclosure.
  • 7D is a view for explaining a method of driving a display module according to an embodiment of the present disclosure.
  • FIG. 8 is a detailed configuration diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 9 is a flowchart illustrating a method of controlling a display apparatus according to an embodiment of the present disclosure.
  • a component eg, a first component is "coupled with/to (operatively or communicatively)" to another component (eg, a second component)
  • another component eg, a second component
  • the certain element may be directly connected to the other element or may be connected through another element (eg, a third element).
  • a component eg, a first component (eg, a second component)
  • other components eg, a third component
  • the display apparatus 100 includes a display module 110 , a driver 120 , and a processor 130 .
  • the display module 110 includes a plurality of pixels arranged in a matrix form.
  • each pixel includes a plurality of sub-pixels of different colors, and each sub-pixel includes a light emitting device of a corresponding color.
  • the light emitting device is an optical semiconductor device that converts electrical energy into light energy and outputs, and may be a light emitting diode (LED), but is not limited thereto.
  • LED light emitting diode
  • various embodiments of the present disclosure, which will be described later, may also be applied to organic light emitting diodes (OLEDs).
  • each pixel of the display module 110 includes an R sub-pixel including a red (R) LED, a G sub-pixel including a green (G) LED, and a B sub-pixel including a blue (B) LED; It can include the same three types of sub-pixels, and reproduces the color of an image by combining the three primary colors of R, G, and B.
  • R red
  • G green
  • B blue
  • the display apparatus 100 may include a plurality of display modules 110-1 to 110-n (n ⁇ 2) physically connected to each other.
  • the plurality of display modules 110-1 to 110-n may be physically connected to each other to constitute an LED cabinet, and the display apparatus 100 may include a plurality of such LED cabinets.
  • examples of the display device 100 including the plurality of display modules 110-1 to 110-n include a small display device such as a monitor for a personal computer, a TV, and a digital signage (digital signage). ), a large display device such as an electronic display, a video wall, and the like.
  • the display apparatus 100 may include one display module 110 as shown in FIG. 3B .
  • the display device 100 that can be implemented with one display module 110 as described above, various electronic products such as a wearable device, a portable device, a handheld device, etc. There may be electronic products and the like.
  • the LED pixel 40 includes an R LED 41 , a G LED 42 , and a B LED 43 , and the anode terminals of each LED 41 to 42 are connected in common. Therefore, while the anode voltage VLED is applied to the common anode terminal, when the driving currents I_R, I_G, and I_B respectively flow through the cathode terminals of each LED 41 to 42, each LED 41 to 43 emits light.
  • the LED pixel 40 as shown in FIG. 4A may be implemented as a single package as shown in FIG. 4B .
  • the present invention is not limited thereto, and the R LED 41 , the G LED 42 , and the B LED 43 may be separately disposed adjacent to each other in the display module 110 to configure the LED pixel 40 , of course. am.
  • FIG. 5 is a diagram illustrating a structure of a display module according to an embodiment of the present disclosure. Specifically, FIG. 5 shows a display module 110 including a plurality of LED pixels 40 arranged in an m * n matrix.
  • anode terminals of LEDs included in LED pixels disposed in the same row line are commonly connected to each other, and in the same column line.
  • the cathode terminals of the LEDs included in the arranged LED pixels may have a structure in which they are commonly connected for each color of the LED.
  • the driving unit 120 drives the display module 110 .
  • the driving unit 120 may drive the display module 110 by providing a driving voltage and a driving current to the display module 110 under the control of the processor 130 .
  • the driving unit 120 may include a plurality of switches for selecting LED pixels of the display module 110 for each row line.
  • the plurality of switches may be arranged for each row line, and one end of each switch may receive a driving voltage, and the other end may be connected to a common anode terminal for each row line. Accordingly, when the switch is turned on, the driving voltage may be applied to the anode terminals of the LED pixels disposed in the corresponding row line through the turned on switch.
  • each switch may be implemented as a field effect transistor (FET), but is not limited thereto.
  • FET field effect transistor
  • the driver 120 may include at least one LED driver for providing a driving current to the LEDs included in the LED pixels disposed on the selected row line.
  • the LED driver may be a current sink type driver in which a driving current is sinked for each common cathode terminal described above in FIG. 5 .
  • the LED driver may adjust the pulse width of the driving current based on the grayscale value input from the processor 130 . That is, the LED driver may drive the display module 110 in a PWM manner. Specifically, since the luminance of the LED increases as the driving current is applied for a long time, the LED driver may adjust the pulse width of the driving current so that the higher the grayscale value, the longer the driving current is applied.
  • the LED driver applies a single driving current that lasts for a time corresponding to the gray value within the time when the driving voltage is applied to express the gray level by applying a general PWM method, or a unit pulse width within the time when the driving voltage is applied.
  • the pulse width of the driving current can be adjusted by using a scrambled PWM method in which a plurality of driving currents having a .
  • the LED driver may be provided for each LED block.
  • the present invention is not limited thereto, and the LED driver may be provided in units of display modules according to embodiments.
  • FIG. 6B is a diagram illustrating an LED driver according to an embodiment of the present disclosure. Specifically, FIG. 6B shows LEDs disposed on any one row line (eg, the x-th row line, 1 ⁇ x ⁇ 24) of one of the LED blocks included in the display module 110 of FIG. 6A . The pixels and the LED driver 120-1 for the corresponding LED block are shown.
  • any one row line eg, the x-th row line, 1 ⁇ x ⁇ 24
  • the LED driver 120-1 is Light emission of each of the LEDs disposed on the x-th row may be controlled.
  • one LED block includes 24 row lines and 16 column lines, and an LED pixel disposed in each column line includes 3 LEDs (R, G, B LEDs).
  • the LED driver 120-1 includes 48 outputs to respectively control the light emission of LEDs included in the corresponding LED block, and each cathode terminal of the 48 LEDs disposed on the x-th row is the LED driver 120 .
  • Each of the 48 output pins of -1) is connected.
  • the processor 130 controls the overall operation of the display apparatus 100 .
  • the processor 130 may control the driver 120 to sequentially apply a driving voltage to the light emitting devices included in the pixels disposed on each row line in the display module 110 in row line units.
  • the anode terminals of the LEDs included in the LED pixels disposed on the same row line of the display module 110 are commonly connected to each other, so that the processor 130 includes a plurality of the plurality of drivers included in the driving unit 120 .
  • the driving voltage may be sequentially applied to each row line of the display module 110 .
  • FIG. 7A illustrates an example in which a driving voltage is sequentially applied from a first row line to an nth row line of the display module 110 during two image frame times. Referring to FIG. 7A , it can be seen that the driving voltage is applied to each row line for the same time (a).
  • the processor 130 may control the driver 120 to apply a driving current having a pulse width based on a grayscale value to each of the light emitting devices included in the pixels disposed on the row line to which the driving voltage is applied. .
  • the processor 130 performs the operation while the driving voltage is applied to the common anode terminal of the LED pixels disposed on any one of the plurality of row lines of the display module 110 while the LEDs disposed on the corresponding row line.
  • the LED driver By controlling the LED driver so that a driving current based on a grayscale value is applied to each, light emission of each of the LEDs arranged in the row line to which the driving voltage is applied can be controlled.
  • FIG. 7B to 7D show R, G, and B LEDs included in one LED pixel while a driving voltage is applied to a common anode terminal of the LEDs disposed on any one of the row lines shown in FIG. 7A .
  • the driving currents I_R, I_G, and I_B are respectively applied to the .
  • the processor 130 determines that, while the driving voltage is applied to the common anode terminals of the R, G, and B LEDs, the driving currents of pulse widths according to the grayscale values of the R, G, and B LEDs are R, G, and B.
  • the LED driver can be controlled to be applied to each LED.
  • the R, G, and B LEDs have different grayscale values, and accordingly, driving currents of different pulse widths are provided to the R, G, and B LEDs, respectively.
  • one driving voltage V1 of the same magnitude is applied to each row line of the display module 110 .
  • the driving voltage V1 is based on the LED with the highest forward voltage among the R, G, and B LEDs in order to drive all the R, G, and B LEDs. size should be set.
  • a driving voltage when a driving voltage is applied in a row line unit, a driving including a plurality of voltages having different magnitudes to the common anode terminal of the light emitting devices disposed in each row line A voltage may be applied.
  • the plurality of voltages may have different magnitudes based on the color of the light emitting device.
  • the driving voltage may include a first voltage applied to a light emitting device of a color having a relatively low forward voltage among a plurality of light emitting devices of different colors and a first voltage applied to a light emitting device of a color having a relatively high forward voltage. It may contain two voltages.
  • the forward voltage of R, G, and B LEDs is relatively low for R LEDs compared to G and B LEDs.
  • the forward voltage of R, G, B LEDs is 2.1[V]
  • G LED may be about 2.9 [V]
  • B LED may be about 3.0 [V], but it is not limited thereto.
  • the first voltage may be applied to the R LED, and the second voltage may be applied to the G and B LEDs.
  • the first and second voltages may be voltages consecutive to each other in time, but are not limited thereto.
  • a driving voltage including a first voltage V2 and a second voltage V1 may be applied to the common anode terminals of the R, G, and B LEDs.
  • the first voltage V2 may be higher than the forward voltage of the R LED and lower than the second voltage V1 .
  • the processor 130 provides the first control to the LEDs disposed in one row line among the plurality of row lines. While the voltage 1 V2 is applied, the driving unit 120 may be controlled so that the driving current I_R is applied to each of the R LEDs disposed on the corresponding row line.
  • the processor 130 provides driving currents I_G and I_B to each of the G and B LEDs arranged in the corresponding row line. It is possible to control the driving unit 120 to be applied.
  • the time a1 and the second voltage may be the same.
  • the present invention is not limited thereto.
  • the reason why a1 and a2 may be equally divided and used within the entire driving voltage application time a, that is, the PWM operation time is reduced by half, but not a problem is as follows.
  • the processor 130 converts the grayscale value of the input image into the grayscale value of the display module 110 , and provides the converted grayscale value to the LED driver, and the LED driver provides the converted grayscale value provided by the processor 130 .
  • the pulse width of the driving current is adjusted based on the grayscale value.
  • the processor 130 displays the grayscale value of the input image. It is possible to map and convert the grayscale value used by the module 110, and provide the converted grayscale value to the LED driver.
  • the display apparatus 100 when the display apparatus 100 operates in the normal mode, it is usually driven at 50% or less of the maximum brightness of the display module 110 . That is, in the normal mode, the processor 130 maps the full white grayscale value of 255 of the input source to about 32000 grayscale values of the display module 110 , and converts the remaining grayscale values accordingly to provide the converted grayscale values to the LED driver. Since the maximum grayscale value of 16 bits is 65535, 32000 corresponds to less than 50% of the maximum grayscale value of the display module 110 .
  • the display device 100 is driven at 50% or less of the maximum brightness of the display module 110 in the normal mode, there is no problem in displaying an image even if the PWM operation time is reduced by half.
  • the processor 130 may map the full white grayscale value 255 of the input source to 50% or more of the maximum grayscale value of the display module 110 .
  • the processor 130 may map the full white grayscale value 255 of the input source to the grayscale value 50000 of the display module 110 .
  • 50000 is 50% or more of the grayscale value of the display module 110, so depending on the grayscale value of the image, there may be LEDs that require a driving current application time of 50% or more of the total driving voltage application time a. It can be a problem if a1 and a2 are equally divided and used.
  • the processor 130 sets the converted grayscale values of all light emitting devices included in the display module 110 to a predetermined value (eg, the maximum grayscale value) based on the maximum grayscale value of the display module 110 .
  • a predetermined value eg, the maximum grayscale value
  • the driving unit 120 may be controlled such that a driving voltage including the voltage V2 and the second voltage V1 is sequentially applied in a row line unit.
  • the processor 130 if there is a light emitting device in which the converted grayscale value exceeds the predetermined value among all the light emitting devices, the processor 130 , as shown in FIG. 7B , a light emitting device included in pixels disposed in each row line.
  • the driving unit 120 may be controlled such that the driving voltage of the second voltage V1 is sequentially applied in a row line unit.
  • the processor 130 is a light emitting device (R LEDs) to which the first voltage V2 is applied among the converted grayscale values of all the light emitting devices included in the display module 110 . ) and the second maximum grayscale value of the light emitting devices (G LEDs and B LEDs) to which the second voltage V1 is applied.
  • R LEDs light emitting device
  • G LEDs and B LEDs the second maximum grayscale value of the light emitting devices
  • the processor 130 determines that the driving voltage is changed based on the ratio of the first and second maximum grayscale values.
  • the ratio of the time for which the first and second voltages are applied within the time for which the voltage is applied may be adjusted.
  • the LEDs included in the display module 110 are divided into two types of R LEDs and G and B LEDs, and different driving voltages are applied to each type. Accordingly, if the sum of the grayscale value of the LED having the maximum grayscale value among the R LEDs and the grayscale value of the LED having the maximum grayscale value among the G and B LEDs is less than or equal to the maximum grayscale value of the display module 110 , the predetermined value Even when LEDs having the above grayscale values exist, the display module 110 can be driven in the same manner as in FIG. 7C by adjusting the ratios of a1 and a2.
  • FIG. 7D shows a case in which the ratios of a1 and a2 are adjusted as described above.
  • the R LED through which the illustrated driving current I_R flows has the maximum grayscale value among the R LEDs included in the display module 110 .
  • the grayscale value of the R LED through which the illustrated driving current I_R flows is 60% of the maximum grayscale value of the display module 110 .
  • the grayscale value of the LED having the maximum grayscale value among the G and B LEDs included in the display module 110 is 40% of the maximum grayscale value of the display module 110 .
  • the LED having the maximum gray value among the G and B LEDs may exist in an LED pixel different from the R LED through which the illustrated driving current I_R flows.
  • the processor 130 determines that the first voltage V1 is applied time a1 and the second voltage V2 based on 6:4, which is the ratio of the two maximum grayscale values.
  • the ratio of the applied time a2 may be adjusted to 6:4.
  • the display module 110 If the sum of the maximum grayscale values of the R LEDs and the G and B LEDs included in the display module 110 exceeds the maximum grayscale value of the display module 110, the display module 110 is shown in FIG. 7b. It may be driven in the manner shown.
  • the LEDs included in the display module 110 are divided into two types of R LED, G, and B LED, and different driving voltages are applied to each type, but the embodiment is not limited thereto.
  • an embodiment in which different sizes of driving voltages are applied to each of the R, G, and B LEDs may be possible.
  • the display apparatus 100 includes a display module 110 , a current sink circuit 120 - 1 , a plurality of switches 120 - 2 , a driving voltage changeover switch 120 - 3 , a processor 130 , and The driving voltage providing unit 140 may be included.
  • a display module 110 the display apparatus 100 includes a display module 110 , a current sink circuit 120 - 1 , a plurality of switches 120 - 2 , a driving voltage changeover switch 120 - 3 , a processor 130 , and The driving voltage providing unit 140 may be included.
  • FIG. 8 descriptions of contents overlapping with those described above will be omitted.
  • the current sink circuit 120 - 1 , the plurality of switches 120 - 2 and the driving voltage changeover switch 120 - 3 may be included in the above-described driving unit 120 .
  • the current sink circuit 120 - 1 has a configuration corresponding to the above-described LED driver, and the driving current is sinked into the current sink circuit 120 - 1 for each common-connected cathode terminal of the display module 110 .
  • a plurality of switches 120 - 2 are provided for each row line of the display module 110 , a driving voltage is applied to one end of each, and the other end is connected to a common anode terminal for each row line.
  • One end of the driving voltage changeover switch 120 - 3 is connected to one end of the plurality of switches 120 - 2 , and the other end is switched between driving voltages of different magnitudes provided by the driving voltage providing unit 140 . .
  • the plurality of switches 120 - 2 and the driving voltage changeover switch 120 - 3 may be implemented as a Field Effect Transistor (FET), but are not limited thereto.
  • FET Field Effect Transistor
  • the driving voltage providing unit 140 provides a plurality of driving voltages of different sizes to the display module 110 through the driving voltage conversion switch 120 - 3 and the plurality of switches 120 - 2 .
  • the driving voltage providing unit 140 may include a switching mode power supply (SMPS), a power management IC (PMIC), a DC/DC converter, and the like, but is not limited thereto.
  • SMPS switching mode power supply
  • PMIC power management IC
  • DC/DC converter DC/DC converter
  • the processor 130 may sequentially turn on the plurality of switches 120 - 2 so that the driving voltage is sequentially applied to the display module 110 in a row line unit.
  • the driving voltage may include a first voltage V2 and a second voltage V1 having different magnitudes in succession to each other.
  • the processor 130 applies a driving voltage including the first voltage V2 and the second voltage V1 to the corresponding row line while any one of the plurality of switches 120 - 2 is turned on. It is possible to control the driving voltage changeover switch 120-3 as possible.
  • the processor 130 controls the switching time between the first voltage V2 and the second voltage V1 of the driving voltage changeover switch 120-3, in accordance with the various embodiments described above with reference to FIGS. 7A to 7D .
  • the ratio between a1 and a2 can be adjusted accordingly.
  • the adjustment of the ratio between a1 and a2 includes a case where a1 is 0% and a2 is 100%.
  • the processor 130 may control the current sink circuit 120 - 1 so that a driving current flows to the light emitting devices included in pixels disposed on a row line corresponding to an on switch.
  • the display apparatus 100 may include a memory.
  • Image data may be stored in a memory (not shown) in units of frames.
  • the processor 130 checks the grayscale value in advance for each image frame, and controls the driving units 120-1 to 120-3 to drive the display module 110 according to the adjusted ratio a1:a2 based on this. can do.
  • FIG. 8 may be implemented as separate hardware components and included in the display apparatus 100 .
  • the embodiment is not limited thereto.
  • an LED driver including a plurality of switches 120 - 2 and a driving voltage changeover switch 120 - 3 , that is, a current sink circuit 120 - 1 may be included in the display apparatus 100 .
  • the function of the driving voltage changeover switch 120 - 3 may be included in the driving voltage providing unit 140 . Accordingly, the driving voltage providing unit 140 performs one voltage (eg, the first voltage V2) or a plurality of voltages (eg, the first voltage V2) according to the control of the processor 120 . and a driving voltage including the second voltage V1) may be directly provided to the plurality of switches 120 - 2 .
  • the display apparatus 100 may include a display module 110 in which pixels including a plurality of light emitting devices of different colors are arranged in a matrix form.
  • anode terminals of light emitting devices included in pixels disposed in the same row line are commonly connected to each other, and cathode terminals of light emitting devices included in pixels disposed in the same column line are connected to the light emitting device.
  • a common connection may be made for each color of the device.
  • the display apparatus 100 may sequentially apply a driving voltage to light emitting devices included in pixels disposed on each row line in the display module 110 in row line units ( S910 ).
  • the driving voltage may include a plurality of voltages having different magnitudes based on the colors of the plurality of light emitting devices.
  • the driving voltage includes a first voltage applied to a light emitting device of a color having a relatively low forward voltage among a plurality of light emitting devices of different colors and a second voltage applied to a light emitting device of a color having a relatively high forward voltage. voltage may be included.
  • a plurality of light emitting devices of different colors include a red (R) LED, a green (G) LED, and a blue (B) LED, a first voltage is applied to the R LED, and the second voltage is , G, and B LEDs.
  • the first and second voltages included in the driving voltage may be temporally continuous voltages.
  • the display apparatus 100 may apply a driving current having a pulse width based on a grayscale value to each of the plurality of light emitting devices of different colors included in the pixels disposed on the row line to which the driving voltage is applied.
  • a driving current having a pulse width based on a grayscale value is applied.
  • the display apparatus 100 applies a first voltage to the pixels arranged in one row line while the first voltage is applied to the light emitting elements included in the pixels arranged in one row line of the display module 100 .
  • a driving current is applied to each of the included R LEDs, and a second voltage is applied to the light emitting devices included in the pixels disposed in the single row line, and included in the pixels disposed in the single row line.
  • a driving current may be applied to each of the G and B LEDs.
  • the display apparatus 100 converts a grayscale value of an input image into a grayscale value of the display module 110 , and converts all light emitting devices included in the display module 110 .
  • the grayscale value is equal to or less than a predetermined value based on the maximum grayscale value of the display module 110
  • a driving voltage including the first voltage and the second voltage is applied to the light emitting devices included in the pixels arranged in each row line. It can be applied sequentially on a line-by-line basis.
  • the display device 100 applies a second voltage to the light emitting devices included in pixels disposed in each row line. may be sequentially applied in units of row lines.
  • the display apparatus 100 converts a grayscale value of an image into a grayscale value of the display module 110 , and displays all of the light emitting devices included in the display module 110 .
  • the first maximum grayscale value of the light emitting devices to which the first voltage is applied and the second maximum grayscale value of the light emitting devices to which the second voltage is applied may be identified.
  • the display apparatus 100 performs the driving voltage based on the ratio of the first and second maximum grayscale values. It is possible to adjust the ratio of the time during which the first and second voltages are applied within the time for which the voltage is applied.
  • the display device 100 is provided for each row line, and a driving voltage is applied to one end and the other end is connected to the anode terminal commonly connected to the plurality of switches 120 - 2 and the cathode terminal commonly connected to the drive. It may include a current sink circuit 120 - 1 through which a current sinks.
  • the display apparatus 100 sequentially turns on a plurality of switches, and the current sink circuit 120 - 1 so that a driving current flows to the light emitting devices included in pixels disposed on a row line corresponding to the turned on switch. can control
  • various embodiments of the present disclosure may be implemented as software including instructions stored in a machine-readable storage media readable by a machine (eg, a computer).
  • the device is a device capable of calling a stored command from a storage medium and operating according to the called command, and may include the display device 100 according to the disclosed embodiments.
  • the processor may perform a function corresponding to the instruction by using other components directly or under the control of the processor.
  • Instructions may include code generated or executed by a compiler or interpreter.
  • the device-readable storage medium may be provided in the form of a non-transitory storage medium.
  • 'non-transitory' means that the storage medium does not include a signal and is tangible, and does not distinguish that data is semi-permanently or temporarily stored in the storage medium.
  • the method according to various embodiments disclosed in the present disclosure may be provided by being included in a computer program product.
  • Computer program products may be traded between sellers and buyers as commodities.
  • the computer program product may be distributed in the form of a machine-readable storage medium (eg, compact disc read only memory (CD-ROM)) or online through an application store (eg, Play StoreTM).
  • an application store eg, Play StoreTM
  • at least a part of the computer program product may be temporarily stored or temporarily generated in a storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.
  • Each of the components may be composed of a singular or a plurality of entities, and some sub-components of the aforementioned sub-components may be omitted, or other sub-components may be various. It may be further included in the embodiment.
  • some components eg, a module or a program
  • operations performed by a module, program, or other component may be sequentially, parallel, repetitively or heuristically executed, or at least some operations may be executed in a different order, omitted, or other operations may be added.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

L'invention concerne un dispositif d'affichage. Ce dispositif d'affichage comprend : un module d'affichage dans lequel des pixels comprenant une pluralité d'éléments électroluminescents de couleur différente sont agencés dans une matrice ; une unité de commande qui commande le module d'affichage par application d'une tension d'excitation et d'un courant d'attaque aux éléments électroluminescents inclus dans le module d'affichage ; et un processeur qui commande l'unité de commande de sorte que, dans le module d'affichage, une tension d'excitation est appliquée de manière séquentielle, rangée par rangée, aux éléments électroluminescents inclus dans les pixels agencés dans chaque rangée, et un courant d'excitation ayant une largeur d'impulsion basée sur une valeur de gradation est appliqué à chacun des éléments électroluminescents de couleur différente inclus dans les pixels agencés dans la rangée à laquelle la tension d'excitation a été appliquée, la tension d'excitation comprenant une pluralité de tensions de différentes amplitudes sur la base des couleurs de la pluralité d'éléments électroluminescents.
PCT/KR2020/008498 2020-02-20 2020-06-30 Dispositif d'affichage et procédé de commande pour dispositif d'affichage Ceased WO2021167179A1 (fr)

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KR1020200020883A KR102746328B1 (ko) 2020-02-20 2020-02-20 디스플레이 장치 및 디스플레이 장치의 제어 방법
KR10-2020-0020883 2020-02-20

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US20070139302A1 (en) * 2002-10-09 2007-06-21 Canon Kabushiki Kaisha Image Display Apparatus
US20120306728A1 (en) * 2004-08-23 2012-12-06 Semiconductor Energy Laboratory Co., Ltd. Display Device, Driving Method Of The Same, and Electronic Device
KR20130067629A (ko) * 2011-12-14 2013-06-25 엘지전자 주식회사 소비 전력을 줄이는 유기발광다이오드 구동 방법 및 그 장치
KR101303865B1 (ko) * 2012-12-26 2013-09-04 (주)코스모비전 Ｌｅｄ별 구동전원을 프로그램화하는 절전형 ｌｅｄ 전광판
US20150123555A1 (en) * 2011-06-27 2015-05-07 Sct Technology, Ltd. Led display systems

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KR102544322B1 (ko) * 2016-09-26 2023-06-19 삼성디스플레이 주식회사 발광 표시 장치
KR102599600B1 (ko) 2016-11-23 2023-11-07 삼성전자주식회사 디스플레이 장치 및 그 구동 방법
KR102498084B1 (ko) * 2018-06-01 2023-02-10 삼성전자주식회사 디스플레이 패널
KR102477981B1 (ko) * 2018-07-31 2022-12-19 삼성디스플레이 주식회사 구동 전압 제공부 및 이를 포함하는 표시 장치

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US20070139302A1 (en) * 2002-10-09 2007-06-21 Canon Kabushiki Kaisha Image Display Apparatus
US20120306728A1 (en) * 2004-08-23 2012-12-06 Semiconductor Energy Laboratory Co., Ltd. Display Device, Driving Method Of The Same, and Electronic Device
US20150123555A1 (en) * 2011-06-27 2015-05-07 Sct Technology, Ltd. Led display systems
KR20130067629A (ko) * 2011-12-14 2013-06-25 엘지전자 주식회사 소비 전력을 줄이는 유기발광다이오드 구동 방법 및 그 장치
KR101303865B1 (ko) * 2012-12-26 2013-09-04 (주)코스모비전 Ｌｅｄ별 구동전원을 프로그램화하는 절전형 ｌｅｄ 전광판

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