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EP1879173A1 - Affichage à cristaux liquides et procédé pour sa suralimentation - Google Patents

Affichage à cristaux liquides et procédé pour sa suralimentation Download PDF

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Publication number
EP1879173A1
EP1879173A1 EP06116985A EP06116985A EP1879173A1 EP 1879173 A1 EP1879173 A1 EP 1879173A1 EP 06116985 A EP06116985 A EP 06116985A EP 06116985 A EP06116985 A EP 06116985A EP 1879173 A1 EP1879173 A1 EP 1879173A1
Authority
EP
European Patent Office
Prior art keywords
gray
level value
over driving
liquid crystal
look
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.)
Withdrawn
Application number
EP06116985A
Other languages
German (de)
English (en)
Inventor
Sheng-Pin Tseng
Ching-Chao Chang
Po-Sheng Shih
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.)
Hannstar Display Corp
Original Assignee
Hannstar Display 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 Hannstar Display Corp filed Critical Hannstar Display Corp
Priority to EP06116985A priority Critical patent/EP1879173A1/fr
Publication of EP1879173A1 publication Critical patent/EP1879173A1/fr
Withdrawn legal-status Critical Current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
    • G09G3/34—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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active 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
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0252—Improving the response speed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/16—Determination of a pixel data signal depending on the signal applied in the previous frame

Definitions

  • the present invention relates to an over driving method, and more particularly to an over driving technique to improve the response time of a liquid crystal display.
  • Liquid crystal display has been used in various electronic devices. Because liquid crystal molecules do not generate light by themselves, a back light module is required for providing light on a liquid crystal display.
  • the backlight module typically, there are two types of backlight module in liquid crystal display.
  • One is always-lighting type backlight module.
  • the other one is flash type backlight module.
  • the flash type backlight module for example, is applied to liquid crystal display driven by a color sequential method.
  • the color sequential method three primary colors are sequentially switched in the persistence of vision time to compose a color. That is the primary colors are sequentially displayed in three time segments. Therefore, a complete color image is displayed as a rapidly changing sequence of primary monochrome images. Since every pixel unit in the display contributes to every primary image, a color sequential imaging display must address pixel unit first to select which pixel unit to display.
  • the scan lines are scanned from the top to the bottom. Then, the backlight module is turned on to display a specific gray-level image on the panel. Since the top scan line is scanned first and the bottom scan line is scanned last. Therefore, a time difference exists in these scan lines. Such time difference causes different response time for liquid crystal molecule to rotate. That is the liquid crystal molecule located in the top scan lines has more response time to rotate. The liquid crystal molecule located in the bottom scan lines has less response time to rotate. Therefore, an over driving technique is disclosed to compensate the response time difference. Accordingly, a specific voltage is corresponded to a specific rotation angle of liquid crystal molecule. A response time is required for liquid crystal molecule to rotate to the specific angle.
  • liquid crystal molecule When a higher voltage is applied to liquid crystal molecule, liquid crystal molecule has a higher rotation velocity.
  • the over driving technique uses an over driving voltage that is higher than the target voltage to accelerate the rotation of liquid crystal molecule to reduce the required response time. When the liquid crystal molecule rotates to the angle corresponding to the target voltage, the overdriving voltage is then reduced to the target voltage.
  • a look up table as shown in Figure 1 is used for determining the over driving voltage.
  • two parameters are used to search the over driving voltage.
  • the first parameter is the gray-level value G n of the present frame.
  • the second parameter is the gray-level value G n-1 of the previous frame.
  • the G n ' is the output gray-level value.
  • the gray-level value G n is 2 and the gray-level value G n-1 is 253.
  • the output gray-level value G n ' can be obtained from the table as 0.
  • FIG. 1 B is a typical schematic diagram of an over driving circuit.
  • the over driving circuit 100 comprises a buffer 101, a memory 102 and a modifier 103.
  • the over driving circuit 100 receives an image gray level value, such as the gray level value G n , of a frame time of a pixel unit, the gray level value G n is sent to the memory 102 through the buffer 101.
  • the gray level value G n is also sent to the modifier 103.
  • the modifier 103 may search the look up table according to the gray level value G n and the gray level value G n-1 of previous frame stored in the memory 102 to determine a corrected gray-level value G n '. Then, the corrected gray-level value G n ' is output from a serializer 104.
  • the corrected gray-level value G n ' is sent to a corresponding device, such as a driver IC.
  • the driver IC translates the gray-level value G n ' into corresponding voltage which controls the rotation angle of liquid crystal molecule.
  • the backlight module is turned on to generate light on the liquid crystal molecule. Liquid crystal molecule with specific rotation angle allows the liquid crystal panel to display image with a specific gray level.
  • the scan lines are scanned from the top to the bottom. Therefore, time difference exists in these scan lines.
  • the typical over driving circuit and method only uses two parameters, the gray-level value of the present frame and the gray-level value of the previous frame, to search the corrected gray level value. Such circuit and method does not really consider the time difference among the scan lines.
  • the main purpose of the present invention is to provide an over driving method for a liquid crystal display to resolve the insufficient response time problem.
  • the over driving method comprises the following steps of providing a modifier including at least one gray-level look up table; inputting a first gray-level value, a second gray-level value and a row number signal to the modifier, wherein the row number signal is corresponding to at least one gray-level look up table; obtaining a corrected value from at least one gray-level look up table according to the first gray-level value and the second gray-level value; and determining an over driving voltage based on the corrected value.
  • the corrected value is obtained by searching the at least one gray-level look up table or calculation based on the at least one gray-level look up table,
  • the modifier further comprises a first reference gray-level value look up table and a second reference gray-level value look up table.
  • the gray-level look up table is obtained by linear interpolating or nonlinear interpolating the first reference gray-level value look up table and the second reference gray-level value look up table.
  • the first reference gray-level value look up table includes a first reference ccorrected gray-level value obtained by searching the first reference gray-level value look up table or calculation based on the first reference gray-level value look up table.
  • the second reference gray-level value look up table includes a second reference ccorrected gray-level value obtained by searching the second reference gray-level value look up table or calculation based on the second reference gray-level value look up table.
  • the first gray-level value is the present gray-level value and the second gray-level value is the previous gray-level value.
  • the second gray-level value is a fixed value composed of a plurality of bits between all bits equal to 0 and all bits equal to 1.
  • the over driving method further comprises the steps of inputting the over driving voltage to a switch device; utilizing the switch device to control the rotation angle of the liquid crystal molecule; turning on a backlight module to generate light on the liquid crystal molecule; and generating a curve of brightness versus time through the operation of the liquid crystal molecule.
  • the integrated values of the brightness versus time in a sub-frame according to the curve are all identical in the liquid crystal display.
  • an over driving circuit of a liquid crystal display comprises a buffer, a memory coupling with the buffer and a modifier coupling with the buffer, the memory and a signal line. This signal line is used to transfer a row number signal to the modifier.
  • the buffer is used to output a first gray-level value.
  • the first gray-level is transferred to the memory and the modifier.
  • the memory is used to output a second gray-level value.
  • the second gray-level is transferred to the modifier.
  • a row number signal is transferred to the modifier.
  • a corrected gray-level value is sent out from the modifier.
  • the circuit further comprises a serializer to receive the corrected gray-level value.
  • the modifier further comprises a gray-level look up table related to the row number signal.
  • the corrected gray-level value output from the over driving circuit and operation method of the present invention is not only based on the gray-level values of the present and previous frame of a pixel unit but also based on the row number of this pixel unit.
  • Such circuit and operation method may compensate the response time difference of the liquid crystal molecules due to different scan lines.
  • the over driving circuit and operation method of the present invention is used in a liquid crystal display with a scan type backlight module or a flash type backlight module, such as a liquid crystal display driven by a color sequential method.
  • FIG. 2A is a schematic diagram of an over driving circuit according to an embodiment of the present invention.
  • the over driving circuit 200 comprises a buffer 201, a memory 202 and a modifier 203.
  • an image gray level value such as the first gray level value G n
  • the first gray level value G n is temporary stored in the buffer 201.
  • the previous image gray level value such as the second gray level value G n-1
  • the first gray level value G n is sent from the buffer 201 to the memory 202.
  • the first gray level value G n is also sent to the modifier 203.
  • the modifier 203 may search the look up table based on the first gray level value G n and the second gray level value G n-1 sent from the memory 202 to obtain a corrected gray-level value G n '.
  • the over driving circuit of the present invention further comprises an interface, such as a serializer 204, for outputting the corrected gray-level value G n '.
  • an over driving voltage is determined.
  • This over driving voltage is sent to corresponding devices in a liquid crystal display.
  • the switch devices are thin film transistors. These switch devices may control the rotation of liquid crystal molecule.
  • the backlight module is turned on to generate light. The generated light is illuminated on the rotated liquid crystal molecule. Because of different rotation angles of the liquid crystal molecule, a specific gray level (brightness) is presented on the liquid crystal display. Therefore, a curve of brightness versus time is generated.
  • the modifier 203 in the present invention is also controlled by a row number signal Y th .
  • This row number signal Y th is used to provide the modifier 203 the row number of this first pixel unit.
  • the modifier 203 may search the corresponding gray-level look up table based on this row number.
  • the modifier 203 comprises a plurality of gray-level look up tables corresponding to different rows.
  • the modifier 203 includes 768 gray-level look up tables corresponding to 768 rows respectively for a liquid crystal display with 1024X768 resolution. While searching the corrected gray-level value based on the row number signal Y th , a gray-level look up table corresponding to Y th row is searched first. Then, a corrected gray-level value can be obtained and output according to the image gray-level value of the previous and present frame of the first pixel unit.
  • Figure 2B is a schematic diagram of using the over-driving circuit of the present invention to search a corrected gray-level value.
  • three parameters are used to search the corrected gray-level value.
  • the first parameter is the gray-level value of the present frame, the first gray-level value G n .
  • the second parameter is the gray-level value of the previous frame, the second gray-level value G n-1 .
  • the third parameter is the row number signal Y th .
  • a corrected gray-level value of a pixel unit located in the 512 th row is searched.
  • the first gray-level value G n of this pixel unit is 128.
  • the second gray-level value G n-1 of this pixel unit is 96.
  • the row number signal Y th is 512. Therefore, the corrected gray-level value is 140 based on the three parameters.
  • a plurality of gray-level look up tables are consisted in the modifier 203 of the present invention.
  • the modifier 203 is controlled by the row number signal Y th . Therefore, while searching the corrected gray-level value, a gray-level look up table corresponding to the row of the first pixel unit located is searched first. Then, a corrected gray-level value is obtained based on the real gray-level values of the present and previous frame of the first pixel unit.
  • the corrected gray-level value searching are not only based on the real gray-level values of the present and previous frame of the first pixel unit but also based on the row where the first pixel unit is located. Therefore, the searched corrected gray-level value may match better to the environment conditions.
  • a possible problem is that too many gray-level look up tables stored in the modifier 203 leads to lengthy searching time.
  • a linear interpolation method or a nonlinear interpolation method is used in the present invneiton to reduce the required number of the gray-level look up tables.
  • the linear interpolation method is described in the following embodiment.
  • one gray-level look up table contains corrected gray-level values for 32 scan lines.
  • both the first gray-level value G n and the second gray-level value G n-1 are changed by 16 gray-level. Therefore, in an example, the pixel unit is located in the 650 th scan line.
  • the second gray-level value G n-1 of the previous frame of the pixel unit is 94.
  • the first gray-level value G n of the present frame of the pixel unit is 165.
  • Figure 3A is a partial gray-level look up table LUT (640) of the 640 th scan line.
  • Figure 3B is a partial gray-level look up table LUT (672) of the 672 nd scan line.
  • Figure 3C is a schematic diagram of using the linear interpolation method to obtain a corresponding corrected gray-level value.
  • three parameters are used to search the corrected gray-level value.
  • the first parameter is the gray-level value of the present frame, the first gray-level value G n .
  • the second parameter is the gray-level value of the previous frame, the second gray-level value G n-1 .
  • the third parameter is the row number signal Y th .
  • the linear interpolation method is illustrated in the figure 3A to obtain the corrected gray-level value when the first gray-level value G n is 160 and the second gray-level value G n-1 is 94.
  • the corrected gray-level value is calculated when the first gray-level value G n is 176 and the second gray-level value G n-1 is 94.
  • the corrected gray-level value is calculated when the first gray-level value G n is 165 and the second gray-level value G n-1 is 94.
  • the corrected gray-level value is calculated when the first gray-level value G n is 176 and the second gray-level value G n-1 is 94.
  • the corrected gray-level value is calculated when the first gray-level value G n is 165 and the second gray-level value G n-1 is 94.
  • Figure 4 is a schematic comparison diagram of using the over driving circuit of the present invention to correct the gray-level value of the scan line.
  • the X-axis represents the time and the Y-axis represents the brightness.
  • the curve is brightness versus time.
  • the corrected gray-level value relates to the gray-level value changed between the previous and present frame of a pixel unit and the row number of the pixel unit. Therefore, the scan lines is scanned from the scan line G 1 to scan line G x when a liquid crystal panel 400 has scan lines G 1 , ⁇ G x/2 ⁇ , G x . In other words, when addressing the row address, the scan line G 1 is addressed first and the scan line G x is addressed later. Therefore, the time difference existing in these scan lines leads the liquid crystal molecules to have different response time.
  • the gray level values of the whole panel 400 transit from level 0 to level 128, the liquid crystal molecule located in the scan line G 1 has response time T R1 .
  • the liquid crystal molecule located in the scan line G X/2 has response time T RX/2 .
  • the liquid crystal molecule located in the scan line G X has response time T RX .
  • different over driving voltages are applied to the two pixel units located in different scan lines even though the two pixel units have the same gray-level value changed between two sequential frames. From figure 4, different over driving voltages are applied to pixel units located in different scan lines.
  • the pixel units located in the scan line G 1 require the least over driving voltages.
  • the pixel units located in the scan line G x require the largest over driving voltages.
  • the reason is that the liquid crystal located in the scan line G X has the least response time T Rx because the scan line G x is scanned last. Therefore, the largest over driving voltage is required to rotate the liquid crystal molecule to the required position associated with specific gray level.
  • the gray-level look up table relates to the row number. Because the corrected gray-level value G n is changed based on the row number, the rotation of the liquid crystal molecule and turning on the backlight module time can still match each other. Therefore, a uniform gray-level brightness is presented on the liquid crystal display panel.
  • Figure 5 is a schematic time sequence diagram used in a color sequential method according to the first embodiment of the present invention.
  • the liquid crystal panel is supposed to represent the same gray-level value.
  • the frame time T is separated to three sub-frames T 1 , T 2 and T 3 .
  • the three sub-frames T 1 , T 2 and T 3 are used to sequentially show three primary colors in the persistence of vision time. Any color can be created by mixing the three primary colors. There is not any reset time between two frames.
  • each sub frame such as the sub frame T 1
  • T A is the addressing time. Because the color sequential method is used in this embodiment, an addressing process is required to apply voltage to corresponding address before each primary color is shown.
  • the time segment T R is the response time for the liquid crystal molecule to rotate to a specific angle.
  • the time segment T B is the time for the backlight module to be turned on.
  • the backlight module When the liquid crystal molecule is rotated to a specific angle, the backlight module is turned on to show a primary color.
  • the response time of the liquid crystal molecule located in the top scan line is longer than the response time of the liquid crystal molecule located in the bottom scan line because the scan lines are sequentially scanned from the top to the bottom. Therefore, a larger over driving voltage is sent to the bottom scan line to accelerate the rotation velocity of the liquid crystal molecule located therein to compensate the difference of the response time.
  • the slope of the brightness versus time curve of the bottom scan line is larger than the slope of the brightness versus time curve of the middle and top scan line.
  • the rotation velocity of the liquid crystal molecule located in the bottom scan line is larger than the rotation velocity of the liquid crystal molecule located in the middle and top scan line.
  • all scan lines have the same integrated values of the brightness versus time curve. Therefore, a uniform gray-level brightness is represented on the liquid crystal panel in the time segment T B .
  • FIG. 6 is a schematic time sequence diagram used in a color sequential method according to the second embodiment of the present invention.
  • the liquid crystal panel is supposed to display an image with the same gray-level value.
  • the frame time T is separated to three sub-frames T 1 , T 2 and T 3 .
  • the three sub-frames T 1 , T 2 and T 3 are used to sequentially show three primary colors in the persistence of vision time.
  • a color can be created by mixing the three primary colors.
  • the main difference between the first embodiment and the second embodiment is that a reset time T s exists between two frames. For example, for a 8 bits case, the reset time T s is used to reset the display of the liquid crystal panel to a specific gray level value, such as 0 gray level value (black color) or 255 gray level value (white color), before next frame time.
  • each sub frame such as the sub frame T 1 , is divided into three time segments T A , T R and T B .
  • the time segment T A is the addressing time.
  • the time segment T R is the response time for the liquid crystal molecule to rotate to a specific position.
  • the time segment T B is the time for the backlight module to be turned on.
  • a larger over driving voltage is sent to the bottom scan line to accelerate the rotation velocity of the liquid crystal molecule located therein to compensate the difference of the response time.
  • all scan lines have the same integrated values of the brightness versus time curve. Therefore, a uniform gray-level brightness is represented in the liquid crystal panel in the time segment T B .
  • the reset time T s may be arranged between two sub-frames as shown in Figure 7.
  • a reset time T s exists between two sub-frames T 1 and T 2 .
  • the main purpose of the reset time T s is to reset the display of the liquid crystal panel to a specific gray level value, such as 0 gray level value (black color) or 255 gray level value (white color), before the sub-frames T 2 .
  • each sub frame, such as the sub frame T 1 . is divided into three time segments T A , T R and T B .
  • the time segment T A is the addressing time.
  • the time segment T R is the response time for the liquid crystal molecule to rotate to a specific position.
  • the time segment T B is the time for the backlight module to be turned on.
  • the pixel unit is reset to a specific gray level value, such as 0 gray level value (black color) or 255 gray level value (white color) after each sub frame.
  • a specific gray level value such as 0 gray level value (black color) or 255 gray level value (white color) after each sub frame.
  • the gray level value of the previous frame in the look up table is a fixed value. Therefore, the gray-level look up table may be simplified to a table with two parameters, row number signal (Y th ) and the present gray-level value (G n ) as shown in Figure 8.
  • a pixel unit is located in the first scan line in a liquid crystal panel.
  • the present gray-level value (G n ) of this pixel unit is 128.
  • the corrected gray-level value is 140.
  • the corrected gray-level value is 160.
  • the corrected gray-level value is 200.
  • FIG. 9 is a schematic time sequence diagram used in a color sequential method according to the third embodiment of the present invention.
  • a reset time exists between two sub-frames.
  • the whole panel is supposed to represent the same gray-level value.
  • the frame time T is separated to three sub-frames T 1 , T 2 and T 3 .
  • the three sub-frames T 1 , T 2 and T 3 are used to sequentially show three primary colors in the persistence of vision time. A color is created by mixing the three primary colors.
  • each sub frame such as the sub frame T 1 , is divided into five time segments T A , T R , T B , T S and T r .
  • the time segment T A is the addressing time. Because the color sequential method is used in this embodiment, an addressing process is required to apply voltage to corresponding address before each primary color is shown.
  • the time segment T R is the response time for the liquid crystal molecule to rotate to a specific position.
  • the time segment T B is the time for the backlight module to be turned on. When the liquid crystal molecule is rotated to a specific angle, the backlight module is turned on to show a specific primary color.
  • the time segments T s is the reset time for resetting the display to a specific gray level value. In this embodiment, the display is reset to 0 gray level value (white color).
  • the time segment T r is the response time for the liquid crystal molecule to rotate to a specific position.
  • the pixel unit is reset to a specific gray level value after each sub frame.
  • the gray level value of the previous frame in the look up table is a fixed value. Therefore, the gray-level look up table may be simplified to a table with two parameters, row number signal (Y th ) and the present gray-level value (G n ) as shown in the Figure 8.
  • a larger over driving voltage is sent to the bottom scan line to accelerate the rotation velocity of the liquid crystal molecule located therein to compensate the difference of the response time.
  • all scan lines have the same integrated values of the brightness versus time curve. Therefore, a uniform gray-level brightness is represented in the liquid crystal panel in the time segment T B .
  • FIG 10 is a schematic time sequence diagram used in a color sequential method according to the fourth embodiment of the present invention. Comparing with Figure 9, the main difference is that, in this embodiment, the reset time segments T s is for resetting the display to a specific gray level value, 255 gray level value (white color).
  • the over driving circuit and operation method of the present invention is not only based on the gray-level values of the present and previous frame of a pixel unit but also based on the row number of this pixel unit. Therefore, when the whole panel is supposed to represent the same gray-level value, a larger over driving voltage is sent to the bottom scan line to accelerate the rotation velocity of the liquid crystal molecule located therein to compensate the difference of the response time because scan lines are scanned sequentially from the top to the bottom.
  • the main purpose why the whole panel displays image with the same gray-levels used as examples in the foregoing embodiments is to simplify the description.
  • the present invention may be applied to display a colorful image.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (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)
  • Liquid Crystal Display Device Control (AREA)
EP06116985A 2006-07-11 2006-07-11 Affichage à cristaux liquides et procédé pour sa suralimentation Withdrawn EP1879173A1 (fr)

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Application Number Priority Date Filing Date Title
EP06116985A EP1879173A1 (fr) 2006-07-11 2006-07-11 Affichage à cristaux liquides et procédé pour sa suralimentation

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EP06116985A EP1879173A1 (fr) 2006-07-11 2006-07-11 Affichage à cristaux liquides et procédé pour sa suralimentation

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100559450C (zh) * 2008-04-08 2009-11-11 钰创科技股份有限公司 液晶显示的驱动系统及方法
EP2202720A1 (fr) * 2008-12-26 2010-06-30 Samsung Electronics Co., Ltd. Affichage à cristaux liquides et son procédé d'affichage pour la compensation de signaux d'image
EP2387027A1 (fr) * 2010-05-11 2011-11-16 Samsung Electronics Co., Ltd. Appareil d'affichage
CN103151004A (zh) * 2012-07-26 2013-06-12 景智电子股份有限公司 过激驱动调整方法及其系统
EP2237565A3 (fr) * 2009-03-31 2013-08-21 Sony Corporation Dispositif et procédé d'affichage
CN105913825A (zh) * 2016-06-30 2016-08-31 京东方科技集团股份有限公司 一种液晶显示器的驱动方法、液晶显示器及显示装置
CN106324875A (zh) * 2016-10-24 2017-01-11 京东方科技集团股份有限公司 一种确定过驱动电压的方法、装置及显示设备
WO2017206286A1 (fr) * 2016-06-03 2017-12-07 深圳市华星光电技术有限公司 Procédé de compensation de variation chromatique
CN110136620A (zh) * 2019-06-28 2019-08-16 京东方科技集团股份有限公司 显示面板的驱动时间差确定方法及系统
CN111128086A (zh) * 2018-10-30 2020-05-08 三星显示有限公司 显示装置和驱动显示装置的方法
CN113870811A (zh) * 2020-06-30 2021-12-31 武汉天马微电子有限公司 显示装置及其亮度调节方法、装置、电子设备及存储介质

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EP2202720A1 (fr) * 2008-12-26 2010-06-30 Samsung Electronics Co., Ltd. Affichage à cristaux liquides et son procédé d'affichage pour la compensation de signaux d'image
EP2237565A3 (fr) * 2009-03-31 2013-08-21 Sony Corporation Dispositif et procédé d'affichage
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US9318036B2 (en) 2010-05-11 2016-04-19 Samsung Display Co., Ltd. Method of compensating image data and display apparatus for performing the same
CN103151004A (zh) * 2012-07-26 2013-06-12 景智电子股份有限公司 过激驱动调整方法及其系统
WO2017206286A1 (fr) * 2016-06-03 2017-12-07 深圳市华星光电技术有限公司 Procédé de compensation de variation chromatique
CN105913825A (zh) * 2016-06-30 2016-08-31 京东方科技集团股份有限公司 一种液晶显示器的驱动方法、液晶显示器及显示装置
US10482827B2 (en) 2016-06-30 2019-11-19 Boe Technology Group Co., Ltd. Display apparatus and driving method thereof
CN106324875A (zh) * 2016-10-24 2017-01-11 京东方科技集团股份有限公司 一种确定过驱动电压的方法、装置及显示设备
CN106324875B (zh) * 2016-10-24 2019-04-30 京东方科技集团股份有限公司 一种确定过驱动电压的方法、装置及显示设备
CN111128086A (zh) * 2018-10-30 2020-05-08 三星显示有限公司 显示装置和驱动显示装置的方法
CN111128086B (zh) * 2018-10-30 2022-12-06 三星显示有限公司 显示装置和驱动显示装置的方法
CN110136620A (zh) * 2019-06-28 2019-08-16 京东方科技集团股份有限公司 显示面板的驱动时间差确定方法及系统
CN113870811A (zh) * 2020-06-30 2021-12-31 武汉天马微电子有限公司 显示装置及其亮度调节方法、装置、电子设备及存储介质

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