WO2017152457A1 - Mura现象补偿方法 - Google Patents

Mura现象补偿方法 Download PDF

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Publication number
WO2017152457A1
WO2017152457A1 PCT/CN2016/078883 CN2016078883W WO2017152457A1 WO 2017152457 A1 WO2017152457 A1 WO 2017152457A1 CN 2016078883 W CN2016078883 W CN 2016078883W WO 2017152457 A1 WO2017152457 A1 WO 2017152457A1
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WO
WIPO (PCT)
Prior art keywords
display panel
lcd display
brightness
data
mura
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Application number
PCT/CN2016/078883
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English (en)
French (fr)
Chinese (zh)
Inventor
张华�
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深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to JP2018547404A priority Critical patent/JP6719579B2/ja
Priority to KR1020187029201A priority patent/KR102118613B1/ko
Publication of WO2017152457A1 publication Critical patent/WO2017152457A1/zh

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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a Mura phenomenon compensation method.
  • LCD liquid crystal display
  • some physical factors on the LCD display panel are different due to some uncontrollable factors in the actual process, resulting in greater than In the range of one pixel, the phenomenon of uneven brightness when displaying a pure gray image is known as the Mura phenomenon in the industry.
  • the Mura phenomenon has become a bottleneck restricting LCD development.
  • the probability of occurrence of the Mura phenomenon can be reduced by increasing the level of the process or improving the purity of the raw materials.
  • the physical characteristics have been finalized.
  • the brightness of the pixel can be corrected by the gray compensation method, thereby improving the Mura phenomenon.
  • the gradation compensation is to improve the brightness uniformity by changing the gradation value of the pixel: that is, the Mura condition of the gradation picture is captured by the camera, then the normal area and the Mura area in the gradation image are determined, and finally the ash according to the normal area is determined.
  • the degree value inversely compensates the gray value of the Mura region, and when the pure gray image is displayed, a lower gray value is applied to the pixel having a higher display brightness, and a higher gray value is applied to the pixel having a lower display brightness. Therefore, the brightness of each pixel after gray compensation is nearly uniform, and the Mura phenomenon is improved.
  • the camera since the camera is shooting at the center of the LCD panel, the camera forms a viewing angle with the area around the panel, and the panel is made by the liquid crystal molecules deflecting the light transmission principle. From the perspective, the brightness of the surrounding area of the panel is different. Under low gray level, the brightness under the side view angle is higher than the brightness under the front view angle, which results in the brightness of the panel obtained when the camera is shot is higher than the actual positive angle. Brightness, then Mura compensation according to the Mura compensation algorithm, as shown in Figure 3, will make the positive viewing angle of the area around the panel low; in high gray, as shown in Figure 4, the situation is just the opposite; thus affecting The product quality of the LCD display panel.
  • the object of the present invention is to provide a Mura phenomenon compensation method, which can correct the influence of the camera angle of view on the Mura compensation effect and improve the product quality of the LCD display panel.
  • the present invention provides a Mura phenomenon compensation method, comprising the following steps:
  • Step 1 Providing an LCD display panel and a camera, and photographing the LCD display panel displaying a certain grayscale image with the camera directly above the center point of the LCD display panel, and obtaining the brightness of the LCD display panel by the acquired image. data;
  • Step 2 The center point of the LCD display panel is used as a coordinate origin to establish a rectangular coordinate system.
  • the length and the width direction of the LCD display panel are respectively an X axis and a Y axis, and a direction perpendicular to the LCD display panel is a Z axis.
  • Step 3 using the brightness correction coefficient formula combined with the coordinate values of the positions on the LCD display panel in the Cartesian coordinate system, and calculating the brightness correction coefficient of each position on the LCD display panel;
  • Step 4 correcting the brightness data according to the calculated brightness correction coefficient to obtain corrected brightness data
  • Step 5 obtaining Mura compensation data according to the corrected brightness data
  • Step 6 Perform Mura compensation on the LCD display panel by using the Mura compensation data obtained in step 5.
  • the formula of the brightness correction coefficient obtained in the step 2 is the following formula (1):
  • Z is the brightness correction coefficient
  • x is the X-axis coordinate value of a position on the LCD display panel in the Cartesian coordinate system
  • y is the Y-axis coordinate of a position on the LCD display panel in the Cartesian coordinate system
  • a value b is a coefficient related to the gradation of the screen displayed by the LCD display panel when the camera is photographed;
  • the X-axis and the Y-axis are both one-half of the length of the LCD display panel, x ranges from [-1, 1], and y ranges from [- a, a], a is the ratio of the width to the length of the LCD display panel, and the value range of b is
  • the camera in the step 1 captures the LCD display panel three times, and the gray scales of the display screen of the LCD display panel are different when the three shots are taken, respectively, the first, second, and third gray scales, thereby obtaining the obtained
  • the luminance data is three copies, which are first, second, and third luminance data, respectively, and respectively correspond to the display screens of the first, second, and third gray scales.
  • the first, second, and third brightness data are respectively corrected, respectively Obtaining the first, second, and third corrected brightness data, and respectively obtaining the first, second, and third Mura compensation data, wherein the first, second, and third brightness data are corrected and respectively
  • the values of b in equation (1) include positive and negative numbers.
  • the Mura compensation under the first, second, and third gray levels is performed on the LCD display panel by using the first, second, and third Mura compensation data.
  • the camera captures the LCD display panel three times or more, and the gray scale of the display screen of the LCD display panel is different each time, so that the obtained brightness data is three or more.
  • M is the Mura compensation data for the specific position
  • d is the normal brightness of the LCD display panel
  • e is the conversion factor between the brightness and the gray level of the LCD display panel.
  • the normal brightness of the LCD display panel is the brightness of the center point of the LCD display panel collected in step 1.
  • the invention also provides a Mura phenomenon compensation method, comprising the following steps:
  • Step 1 Providing an LCD display panel and a camera, and photographing the LCD display panel displaying a certain grayscale image with the camera directly above the center point of the LCD display panel, and obtaining the brightness of the LCD display panel by the acquired image. data;
  • Step 2 The center point of the LCD display panel is used as a coordinate origin to establish a rectangular coordinate system.
  • the length and the width direction of the LCD display panel are respectively an X axis and a Y axis, and a direction perpendicular to the LCD display panel is a Z axis.
  • Step 3 using the brightness correction coefficient formula combined with the coordinate values of the positions on the LCD display panel in the Cartesian coordinate system, and calculating the brightness correction coefficient of each position on the LCD display panel;
  • Step 4 correcting the brightness data according to the calculated brightness correction coefficient to obtain corrected brightness data
  • Step 5 obtaining Mura compensation data according to the corrected brightness data
  • Step 6 Perform Mura compensation on the LCD display panel by using the Mura compensation data obtained in step 5;
  • the formula of the brightness correction coefficient obtained in the step 2 is:
  • Z is the brightness correction coefficient
  • x is the X-axis coordinate value of a position on the LCD display panel in the Cartesian coordinate system
  • y is the Y-axis coordinate of a position on the LCD display panel in the Cartesian coordinate system
  • a value b is a coefficient related to the gradation of the screen displayed by the LCD display panel when the camera is photographed;
  • the X-axis and the Y-axis are both one-half of the length of the LCD display panel, x ranges from [-1, 1], and y ranges from [- a, a], a is the ratio of the width to the length of the LCD display panel, and the value range of b is
  • the brightness correction coefficient, C1 is the brightness value of the specific position after correction.
  • the invention provides a Mura phenomenon compensation method, which uses the brightness correction coefficient formula to calculate the brightness correction coefficient of each position on the LCD display panel, thereby shooting according to the calculated brightness correction coefficient pair through the camera.
  • the obtained LCD display panel is corrected for the brightness data under different gray levels to obtain the corrected brightness data, and then the Mura compensation data is obtained according to the corrected brightness data, and finally the Mura compensation is performed on the LCD display panel by using the Mura compensation data. , thereby correcting the adverse effect on the Mura compensation effect due to the camera viewing angle, and improving the product quality of the LCD display panel.
  • FIG. 1 is a schematic diagram of a camera photographing an LCD display panel at different positions
  • FIG. 2 is a schematic diagram showing the relationship between brightness and gray scale of an LCD display panel under different viewing angles
  • FIG. 3 is a comparison diagram of luminances captured by a camera in a low gray level and before and after Mura compensation in the prior art
  • FIG. 4 is a comparison diagram of luminances captured by a camera and a brightness before and after Mura compensation in a high-gradation LCD display panel of the prior art
  • FIG. 5 is a flow chart of a method for compensating for a Mura phenomenon according to the present invention.
  • FIG. 6 is a schematic diagram showing a curve of a brightness correction coefficient obtained in step 2 of the Mura phenomenon compensation method of the present invention.
  • the present invention provides a Mura phenomenon compensation method, which includes the following steps:
  • Step 1 Providing an LCD display panel and a camera, and photographing the LCD display panel displaying a certain grayscale image with the camera directly above the center point of the LCD display panel, and obtaining the brightness of the LCD display panel by the acquired image. data.
  • the brightness data of the LCD display panel collected at this time may be deviated from the actual display brightness of the LCD display panel due to different angles of view of the camera on the LCD display panel, and the LCD display panel may be different for different display gray levels. The deviation at the same position is also different.
  • the brightness of the LCD display panel collected by the lower grayscale image is greater than the actual display brightness of the LCD display panel.
  • the brightness data of the collected LCD display panel will be smaller than the actual display brightness of the LCD display panel.
  • Step 2 referring to FIG. 6, the center point of the LCD display panel is used as a coordinate origin to establish a rectangular coordinate system.
  • the length and width directions of the LCD display panel are respectively an X-axis and a Y-axis, which are perpendicular to the LCD display panel.
  • the direction is the Z axis, and a brightness correction coefficient formula is obtained in combination with the Cartesian coordinate system.
  • the formula of the brightness correction coefficient obtained in the step 2 is the following formula (1):
  • Z is the brightness correction coefficient
  • x is the X-axis coordinate value of a position on the LCD display panel in the Cartesian coordinate system
  • y is the Y-axis coordinate of a position on the LCD display panel in the Cartesian coordinate system
  • a value b is a coefficient related to the gradation of the screen displayed by the LCD display panel when the camera is photographed;
  • the X-axis and the Y-axis are both one-half of the length of the LCD display panel, x ranges from [-1, 1], and y ranges from [- a, a], a is the ratio of the width to the length of the LCD display panel, and the value range of b is
  • Step 3 Using the brightness correction coefficient formula, the brightness correction coefficient of each position on the LCD display panel is calculated.
  • Step 4 Correcting the brightness data according to the calculated brightness correction coefficient to obtain corrected brightness data.
  • the brightness correction coefficient, C1 is the brightness value of the specific position after correction.
  • Step 5 Obtain the Mura compensation data according to the corrected brightness data.
  • M is the Mura compensation data for the specific position
  • d is the normal brightness of the LCD display panel
  • e is the conversion factor between the brightness and the gray level of the LCD display panel.
  • the normal brightness of the LCD display panel is the brightness of the center point of the LCD display panel collected in step 1.
  • a suitable coefficient b can be selected according to the viewing angle characteristics of each gray level of the LCD display panel. For example, the gray scale of the screen displayed by the LCD display panel is low. Under the low gray level, the LCD display panel is The brightness under the side viewing angle is higher than the brightness in the positive viewing angle (ie, the brightness data of the LCD display panel collected under the side viewing angle is greater than the real display brightness of the LCD display panel), then the coefficient b ranges from As shown in FIG. 6, since b is greater than or equal to 0, the luminance correction coefficient Z obtained by the formula (1) is less than 1, for example, the selection b is 0.2, and b is 0.2 into the luminance coefficient compensation formula, which can be obtained.
  • the value of the brightness C1 corrected by the left and right ends of the LCD display panel is 0.8c, and the conversion coefficient e between the brightness and the gray level of the LCD display panel and the normal brightness d of the LCD display panel are combined.
  • Obtaining the Mura compensation value at the left and right end points of the LCD display panel is (0.8*cd)/e. Since the Mura compensation value is obtained according to the corrected brightness C1, the corrected brightness value 0.8c is higher than the corrected brightness.
  • the value c is reduced by 0.2c, thereby solving the problem that the conventional Mura compensation data algorithm causes the gray value of the surrounding area to be excessively lowered to cause the brightness of the surrounding area of the LCD display panel to be low.
  • the brightness of the LCD display panel under the side view angle is lower than the brightness under the positive viewing angle (ie, the LCD display panel collected under the side view angle)
  • the brightness data is smaller than the real display brightness of the LCD display panel.
  • the above formula of the brightness coefficient (1) is also applicable.
  • the value of the coefficient b is in the range of The obtained brightness compensation coefficient is greater than 1, to solve the problem that the conventional Mura compensation data algorithm excessively increases the gray value of the surrounding area and causes the brightness of the surrounding area of the LCD display panel to be high.
  • Step 6 Perform Mura compensation on the LCD display panel by using the Mura compensation data obtained in step 5.
  • the camera in the step 1 can capture the LCD display panel three times, and the gray scales of the display screen of the LCD display panel are different when the three shots are taken, respectively, the first, second, and third gray scales.
  • the obtained brightness data is three, which are first, second, and third, respectively.
  • the brightness data is respectively corresponding to the display screens of the first, second, and third gray levels; in the step 2 to step 5, the first, second, and third brightness data are respectively corrected, respectively First, second, and third corrected luminance data, and respectively obtaining first, second, and third Mura compensation data; then, in step 3, using first, second, and third Mura compensation Data performing Mura compensation on the first, second, and third gray levels on the LCD display panel; wherein, for the first, second, and third gray levels, the first and second In the three calculations performed separately with the correction of the third luminance data, it is preferable that the value of b in the formula (1) includes a positive number and a negative number, that is, the first, second, and third gray levels are included. Grayscale and low grayscale.
  • the camera in the step 1 may also capture the LCD display panel three times or more, and the gray scale of the display screen of the LCD display panel is different each time, so that the obtained brightness data is three or more.
  • the Mura phenomenon compensation method of the present invention calculates the brightness correction coefficient of each position on the LCD display panel by using the brightness correction coefficient formula, thereby displaying the brightness of the LCD image obtained by the camera according to the calculated brightness correction coefficient.
  • the brightness data of the panel is corrected under different gray levels to obtain the corrected brightness data, and then the Mura compensation data is obtained according to the corrected brightness data, and finally the Mura compensation is performed on the LCD display panel by using the Mura compensation data, thereby correcting
  • the effect of the camera's viewing angle on the Mura compensation effect improves the product quality of the LCD display panel.

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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)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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  • Transforming Electric Information Into Light Information (AREA)
PCT/CN2016/078883 2016-03-09 2016-04-08 Mura现象补偿方法 WO2017152457A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2018547404A JP6719579B2 (ja) 2016-03-09 2016-04-08 ムラ現象の補償方法
KR1020187029201A KR102118613B1 (ko) 2016-03-09 2016-04-08 Mura 현상 보상방법

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201610132929.9 2016-03-09
CN201610132929.9A CN105590604B (zh) 2016-03-09 2016-03-09 Mura现象补偿方法

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KR (1) KR102118613B1 (ja)
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