WO2018192018A1 - Procédé de commande d'atténuation dynamique de la luminosité d'un écran à cristaux liquides, et écran à cristaux liquides - Google Patents

Procédé de commande d'atténuation dynamique de la luminosité d'un écran à cristaux liquides, et écran à cristaux liquides Download PDF

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Publication number
WO2018192018A1
WO2018192018A1 PCT/CN2017/083637 CN2017083637W WO2018192018A1 WO 2018192018 A1 WO2018192018 A1 WO 2018192018A1 CN 2017083637 W CN2017083637 W CN 2017083637W WO 2018192018 A1 WO2018192018 A1 WO 2018192018A1
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WO
WIPO (PCT)
Prior art keywords
pixel
brightness
sub
pixels
liquid crystal
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PCT/CN2017/083637
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English (en)
Chinese (zh)
Inventor
左清成
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武汉华星光电技术有限公司
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Publication of WO2018192018A1 publication Critical patent/WO2018192018A1/fr

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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
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the present invention claims the prior application priority of the invention titled "A Driving Method for Dynamic Blur of Brightness of Liquid Crystal Display and Liquid Crystal Display", which is filed on April 21, 2017, the content of which is hereby incorporated by reference. The manner of introduction is incorporated into this text.
  • the invention belongs to the field of display technology, and in particular to a driving method for liquid crystal display brightness blurring and a liquid crystal display.
  • the CABC function added to the existing liquid crystal panel driver chip to reduce the power consumption of the backlight is used to prevent the sudden change of brightness from being unsuitable to the human eye, and the Dimming function is used to adjust the backlight PWM within a certain period of time (The plus-width modulation signal is finally used to achieve a gradual uniform change in backlight brightness to the desired brightness value.
  • FIG. 1 there is no Diming function and a brightness change with Diming function in the prior art, and the brightness change with the Diming function is generally set, and then the multi-step backlight switching control is adopted. This method can improve the brightness change to the human eye without the Diming function. The incompatibility brought about, but the power consumption is wasted under the picture that some brightness does not need multi-level switching.
  • the technical problem to be solved by the embodiments of the present invention is to provide a driving method for liquid crystal display brightness blurring and a liquid crystal display. It can improve the incompatibility caused by changes in brightness to the human eye and reduce power consumption.
  • a first aspect of the present invention provides a driving method for dynamically blurring a brightness of a liquid crystal display, wherein the liquid crystal display includes an adjustment area, the adjustment area includes at least one pixel, and the pixel includes a red sub a pixel, a green sub-pixel, and a blue sub-pixel, the method comprising:
  • the backlight brightness is adjusted to the target brightness by the first brightness order to perform the next frame display
  • the backlight brightness is adjusted to the brightness of the eye by the second brightness order for the next frame display, wherein the first brightness order is greater than the second brightness order.
  • the adjustment area comprises a plurality of pixels.
  • the adjustment area is included in a display area of the liquid crystal display.
  • the step of analyzing the dominant situation of the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the next frame information includes:
  • the maximum number of pixels of the green sub-pixel gray scale, the maximum number of pixels of the red sub-pixel gray scale, and the maximum number of pixels of the blue sub-pixel gray scale are counted.
  • the step of counting the maximum number of pixels of the green sub-pixel gray scale, the maximum number of pixels of the red sub-pixel gray scale, and the maximum number of pixels of the blue sub-pixel gray scale include:
  • the sum of the maximum number of pixels of the red sub-pixel gray scale and the maximum number of pixels of the blue sub-pixel gray scale is increased by one.
  • the number of the first brightness orders is 4-8, and the number of the second brightness orders is 1-5.
  • the brightness change per unit time in the first brightness order is the same, and the brightness change per unit time in the second brightness order is the same.
  • a second aspect of the present invention provides a liquid crystal display including an adjustment area, where the adjustment area includes at least one pixel, and the pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, and further includes :
  • An obtaining unit configured to obtain information of a next frame to which the adjustment area is to be switched
  • An analyzing unit configured to analyze a dominant condition of a red sub-pixel, a green sub-pixel, and a blue sub-pixel in the next frame picture information
  • a judging unit configured to determine whether a proportion of the dominant condition of the green sub-pixel is greater than or equal to a sum of a ratio of a dominant condition of the red sub-pixel and the blue sub-pixel;
  • a processing unit configured to: if the determination result of the determining unit is yes, the backlight brightness is adjusted to the target brightness by the first brightness order to perform the next frame display, and if the determining result of the determining unit is no, the backlight brightness is The second brightness order is adjusted to the eye brightness for the next frame display, wherein the first brightness order is greater than the second brightness order.
  • analysis unit comprises:
  • a comparison unit configured to compare grayscale sizes of red sub-pixels, green sub-pixels, and blue sub-pixels in each pixel of the next frame picture information
  • a statistical unit is configured to count the maximum number of pixels of the gray color of the green sub-pixel, the maximum number of pixels of the gray sub-pixel gray scale, and the maximum number of pixels of the gray color of the blue sub-pixel.
  • the statistical unit is specifically configured to:
  • the sum of the maximum number of pixels of the red sub-pixel gray scale and the maximum number of pixels of the blue sub-pixel gray scale is increased by one.
  • the eye is not adapted to reduce the brightness change.
  • the brightness of the backlight is adjusted to the target brightness by the first brightness order greater than the second brightness order. At this time, the amplitude of each brightness change is not large, so that the brightness change does not cause discomfort to the human eye; when the next frame is displayed.
  • the sum of the dominant cases of red sub-pixels and blue sub-pixels that are less sensitive to the human eye is greater than the proportion of the dominant situation of green sub-pixels, even if the brightness changes greatly, it will not bring the eye to the human eye.
  • the backlight brightness is adjusted to the target brightness by the second brightness order less than the first brightness order, the switching frequency of the backlight brightness can be reduced, thereby reducing power consumption, thereby facilitating energy saving.
  • 1 is a brightness change diagram of a prior art without Dimming function and a brightness change diagram for turning on the Diming function;
  • FIG. 2 is a flow chart showing a driving method for brightness blurring of a liquid crystal display according to an embodiment of the present invention
  • FIG. 3 is a luminance change diagram (right side diagram) in which backlight luminance is adjusted to a target luminance by a first luminance order and a luminance variation diagram adjusted to a target luminance by a second luminance order (left side diagram) according to an embodiment of the present invention
  • FIG. 4 is a schematic view showing the composition of a liquid crystal display according to an embodiment of the present invention.
  • Embodiments of the present invention provide a driving method for dynamically blurring a brightness of a liquid crystal display.
  • the liquid crystal display panel includes a display area and a non-display area, and the display area of the liquid crystal display includes an adjustment area.
  • the adjustment area The area of the display area is smaller than the area of the display area (in this embodiment), that is, the adjustment area is a small area in the display area, and in another case, the adjustment area may also be the entire display area. That is, the area of the adjustment area is equal to the area of the display area.
  • the adjustment area includes at least one pixel, for example, including one pixel, two pixels, three pixels, six pixels, ten pixels, twenty pixels, and the like.
  • the adjustment area includes a plurality of pixels. Each pixel includes a red sub-pixel (R), a green sub-pixel (G), and a blue sub-pixel (B).
  • the driving method includes:
  • the liquid crystal display obtains the next frame picture information to be switched to the adjustment area. Specifically, the liquid crystal display obtains the brightness information of the next frame picture of all pixels in the adjustment area, where The brightness information refers to the brightness information adjusted by the CABC function, for example, the gray level of the red sub-pixel in a certain pixel, the gray level of the green sub-pixel, and the gray level of the blue sub-pixel.
  • S120 Analyze the dominant situation of the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the next frame picture information
  • the liquid crystal display analyzes the dominant situation of the red sub-pixel, the green sub-pixel, and the blue sub-pixel in the next frame picture information.
  • the sub-pixel predominance refers to the highest gray level of the sub-pixel in the pixel where the sub-pixel is located. For example, in a certain pixel, the gray sub-pixel has a gray scale of 100, the green sub-pixel has a gray scale of 200, and the blue sub-pixel. The gray level is 50, in which case the green sub-pixel dominates the pixel.
  • the embodiment provides that the green sub-pixel is dominant in the pixel, and the design is to improve the brightness.
  • non-green sub-pixels may also be defined as dominant.
  • which sub-pixel is dominant in one pixel may also be in other known manners, for example, by a luminance domain, but the manner of calculating the relative grayscale is complicated. It is also possible to obtain which color dominates the next frame in the adjustment area.
  • S130 determining whether a proportion of the dominant condition of the green sub-pixel is greater than or equal to a sum of a proportion of a dominant condition of the red sub-pixel and the blue sub-pixel;
  • the liquid crystal display determines that the green sub-pixel is dominant according to the analysis result. Whether the proportion of the situation is greater than the sum of the proportions of the red sub-pixel and the blue sub-pixel, for example, in the next frame information of the adjustment area, the proportion of the green sub-pixel dominates is 60%, and the red sub-pixel The proportion of dominant cases is 15%, and the proportion of blue sub-pixels is 25%. At this time, the liquid crystal display judges that the proportion of green sub-pixels is 60% larger than that of red sub-pixels and blue sub-pixels. The proportion of the dominant situation is 40%.
  • the brightness of the backlight is adjusted to the target brightness by the first brightness order, where the first brightness order means that the brightness is changed from the current picture to the target picture, and the first brightness order is changed.
  • the number of the first brightness orders is 4-8, for example, 4, 5, 6, 7, and 8.
  • the number of brightnesses of the first brightness order is 6, please refer to FIG. The figure shown on the side.
  • the amplitude of each brightness change is not large, even if the human eye is sensitive to green, each time change It will not bring discomfort to the human eye.
  • the backlight brightness is adjusted to the target brightness by the second brightness order to perform A frame display, where the second brightness order means that the brightness is changed from the current picture to the target picture, and the second brightness order is changed.
  • the number of second brightness orders is 1-5, for example, 1, 2 3, 4, 5, in this embodiment, the number of brightness of the second brightness order is 3, please refer to the figure shown on the left side of FIG.
  • the second brightness order is smaller than the first brightness order, the current brightness is switched to the target brightness three times, and the amplitude of each brightness change is larger than the first brightness order, thereby reducing The switching frequency of the backlight brightness reduces power consumption.
  • the brightness change is reduced.
  • the human eye brings incompatibility, and the brightness of the backlight is adjusted to the target brightness by the first brightness order greater than the second brightness order. At this time, the amplitude of each brightness change is not large, so that the brightness change does not bring the eye to the human eye.
  • Adaptation when the ratio of the proportion of the red sub-pixel and the blue sub-pixel that are less sensitive to the human eye in the next frame is greater than the proportion of the dominant sub-pixel in the green frame, even if the brightness changes greatly, It will bring discomfort to the human eye.
  • the brightness of the backlight is adjusted to the target brightness with a second brightness order smaller than the first brightness order, which can reduce the switching frequency of the backlight brightness, thereby reducing power consumption, thereby contributing to energy saving.
  • step S120 specifically includes:
  • the adjustment area includes a plurality of pixels, and based on obtaining the next frame picture information, the display panel can obtain the red sub-pixel, the green sub-pixel, and the blue sub-pixel in each pixel in the next frame picture.
  • Gray scale size for example, in one of the pixels, the gray level of the red sub-pixel is 100, the gray level of the green sub-pixel is 200, and the gray level of the blue sub-pixel is 50, and the gray scale of each sub-pixel in the pixel is compared.
  • S122 Count the maximum number of pixels of the gray color of the green sub-pixel, the maximum number of pixels of the gray sub-pixel gray scale, and the maximum number of pixels of the gray color of the blue sub-pixel.
  • the gray level is maximum for which sub-pixel of one pixel has the largest gray scale.
  • the gray scale 200 of the green sub-pixel is the largest among the pixels. Counting the number of pixels with the largest gray scale of each sub-pixel in the adjustment area, for example, the number of pixels in the adjustment area is 20, the number of pixels having the largest gray scale of the green sub-pixel is 12, and the number of pixels having the largest gray scale of the red sub-pixel For six, the maximum number of pixels in the gray level of the blue sub-pixel is two.
  • the design is The gray level of the green sub-pixel in the pixel is the largest in the pixel.
  • step S122 specifically includes:
  • the liquid crystal display determines whether the gray scale of the green sub-pixel in the same pixel is greater than or equal to the red sub-pixel.
  • the gray scale is greater than or equal to the gray scale of the blue sub-pixel.
  • the gray scale 200 of the green sub-pixel > the gray scale 100 of the red sub-pixel > the gray scale 50 of the blue sub-pixel.
  • the maximum number of pixels of the green sub-pixel gray scale is a
  • the maximum number of pixels of the red sub-pixel gray scale is b
  • the number of pixels of the blue sub-pixel gray scale is the largest.
  • the gray level of the green sub-pixel in the current pixel is greater than or equal to the gray level of the red sub-pixel and greater than or equal to the gray level of the blue sub-pixel
  • the maximum number of pixels of the gray color of the green sub-pixel is increased by 1, that is, A+1, the maximum number of pixels of the gray sub-pixel gray scale and the maximum number of pixels of the blue sub-pixel gray scale are unchanged.
  • the sum of the maximum number of pixels of the red sub-pixel gray scale and the maximum number of pixels of the blue sub-pixel gray scale is increased by one.
  • the maximum number of pixels of the green sub-pixel gray scale is a
  • the maximum number of pixels of the red sub-pixel gray scale is b
  • the number of pixels of the blue sub-pixel gray scale is the largest.
  • the target is c.
  • the maximum number of pixels of the gray sub-pixel gray scale is increased by 1, that is, b+1, the maximum number of pixels of the gray color of the green sub-pixel and the blue color.
  • the maximum number of pixels of the sub-pixel gray scale is unchanged; when the gray scale of the blue sub-pixel in the current pixel is maximum, the maximum number of pixels of the gray sub-pixel gray scale is increased by 1, that is, c+1, the green sub-pixel The maximum number of pixels in the grayscale and the maximum number of pixels in the grayscale of the red subpixel are unchanged.
  • the number of pixels with the largest gray scale of the green sub-pixel, the number of pixels with the largest gray sub-pixel gray scale, and the maximum number of pixels with the gray sub-pixel gray scale can be obtained when the next frame of the adjustment region is obtained.
  • the number of pixels with the largest gray scale of the green sub-pixel after the statistics is A
  • the number of pixels with the largest gray scale of the red sub-pixel is B
  • the number of pixels with the largest gray scale of the blue sub-pixel is C
  • the proportion of red subpixels dominates is B/(A+B+C)
  • the proportion of blue subpixels dominates is C/(A+B). +C)
  • the sum of the dominant cases of the red sub-pixel and the blue sub-pixel is (B+C)/(A+B+C).
  • the sizes of the steps in the first brightness order are the same, that is, 6
  • the first brightness change in the unit time in the step is the same
  • the size of each step in the second brightness order is the same, that is, the second brightness change in the unit time in the three steps is the same, and, in this embodiment, The first brightness change is less than the second brightness change.
  • the embodiment of the present invention further provides a liquid crystal display, the liquid crystal display includes an adjustment area, the adjustment area includes at least one pixel, and the pixel includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel, as shown in FIG. 4
  • the liquid crystal display further includes:
  • An obtaining unit 110 configured to obtain information about a next frame to which the adjustment area is to be switched;
  • An analyzing unit 120 configured to analyze a dominant situation of a red sub-pixel, a green sub-pixel, and a blue sub-pixel in the next frame picture information
  • a determining unit 130 configured to determine whether a proportion of the dominant condition of the green sub-pixel is greater than or equal to a sum of a proportion of the dominant condition of the red sub-pixel and the blue sub-pixel;
  • the processing unit 140 is configured to: if the determination result of the determining unit 130 is YES, the backlight brightness is adjusted to the target brightness by the first brightness order to perform the next frame display, and if the determination result of the determining unit 130 is no, the backlight The brightness is adjusted to the brightness of the eye by the second brightness order for the next frame display, The first brightness order is greater than the second brightness order.
  • the analyzing unit specifically includes:
  • a comparison unit 121 configured to compare grayscale sizes of red sub-pixels, green sub-pixels, and blue sub-pixels in each pixel of the next frame picture information
  • the statistic unit 122 is configured to count the maximum number of pixels of the green sub-pixel gray scale, the maximum number of pixels of the red sub-pixel gray scale, and the maximum number of pixels of the blue sub-pixel gray scale.
  • the statistical unit is specifically configured to:
  • the sum of the maximum number of pixels of the red sub-pixel gray scale and the maximum number of pixels of the blue sub-pixel gray scale is increased by one.
  • the present invention has the following advantages:
  • the eye is not adapted to reduce the brightness change.
  • the brightness of the backlight is adjusted to the target brightness by the first brightness order greater than the second brightness order. At this time, the amplitude of each brightness change is not large, so that the brightness change does not cause discomfort to the human eye; when the next frame is displayed.
  • the sum of the dominant cases of red sub-pixels and blue sub-pixels that are less sensitive to the human eye is greater than the proportion of the dominant situation of green sub-pixels, even if the brightness changes greatly, it will not bring the eye to the human eye.
  • the backlight brightness is adjusted to the target brightness by the second brightness order less than the first brightness order, the switching frequency of the backlight brightness can be reduced, thereby reducing power consumption, thereby facilitating energy saving.

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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)

Abstract

L'invention concerne un procédé de commande d'atténuation dynamique de la luminosité d'un écran à cristaux liquides. Le procédé comprend les étapes qui consistent : à obtenir des informations d'une trame suivante à commuter dans une zone de réglage (S110); à analyser des cas dans lesquels des sous-pixels rouges, des sous-pixels verts et des sous-pixels bleus dominent dans les informations de la trame suivante (S120); à déterminer si le rapport des cas dans lesquels les sous-pixels verts dominent est supérieur ou égal à la somme des rapports des cas dans lesquels les sous-pixels rouges et les sous-pixels bleus dominent (S130); si tel est le cas, à régler la luminosité de rétroéclairage sur une luminosité cible dans un premier ordre de luminosité de façon à afficher la trame suivante (S141); et, si tel n'est pas le cas, à régler la luminosité de rétroéclairage sur la luminosité cible dans un second ordre de luminosité de manière à afficher la trame suivante (S142), le premier ordre de luminosité étant supérieur au second. L'invention se rapporte également à un écran à cristaux liquides. La présente invention peut réduire l'inconfort provoqué par un changement de luminosité pour les yeux humains, et réduire la consommation d'énergie.
PCT/CN2017/083637 2017-04-21 2017-05-09 Procédé de commande d'atténuation dynamique de la luminosité d'un écran à cristaux liquides, et écran à cristaux liquides WO2018192018A1 (fr)

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TWI721375B (zh) * 2019-02-22 2021-03-11 友達光電股份有限公司 時序控制器、顯示裝置以及畫面顯示方法
CN112102787B (zh) * 2019-06-17 2023-05-09 上海欧菲智能车联科技有限公司 液晶显示屏的背光亮度控制方法、设备、车辆及存储介质
CN113870805B (zh) * 2021-10-18 2022-10-14 北京显芯科技有限公司 背光控制方法、设备、系统及存储介质

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