CN118131519A - Gray compensation method and device, backlight driver and display device - Google Patents

Gray compensation method and device, backlight driver and display device Download PDF

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Publication number
CN118131519A
CN118131519A CN202410535881.0A CN202410535881A CN118131519A CN 118131519 A CN118131519 A CN 118131519A CN 202410535881 A CN202410535881 A CN 202410535881A CN 118131519 A CN118131519 A CN 118131519A
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value
emitting unit
gray
compensation
target
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CN118131519B (en
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严丞辉
李起源
林荣镇
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Beijing Xianxin Technology Co ltd
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Beijing Xianxin Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • 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
    • 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

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

Abstract

The application provides a gray level compensation method, a gray level compensation device, a backlight driver and display equipment, wherein when a first difference value of a target light-emitting unit is larger than a preset gray level difference value, a compensation gray level value corresponding to the target light-emitting unit is determined, and the first difference value is a difference value between a gray level value of the target light-emitting unit in an n-1 frame and a gray level value of the target light-emitting unit in the n frame; and then, adjusting the actual gray level of the target light-emitting unit in the nth frame to a compensation gray level so that the difference between the actual brightness of the liquid crystal display panel in the nth frame and the target brightness is smaller than the preset brightness difference, wherein the target brightness is the brightness of the liquid crystal display panel when the gray level of the target light-emitting unit in the nth frame is the second preset gray level. By increasing the gray level difference between the adjacent frames of the light emitting units, the response speed of the liquid crystal display panel is shortened, so that the liquid crystal display panel can quickly reach a brightness approaching to the target brightness in the nth frame, the blurring phenomenon is reduced, and excessive hardware circuit structures are not needed.

Description

Gray compensation method and device, backlight driver and display device
Technical Field
The present application relates to the field of display technologies, and in particular, to a gray scale compensation method, a gray scale compensation device, a backlight driver, and a display device.
Background
A backlight Unit (Back Light Unit) of an Active Matrix MINI LIGHT EMITTING Diode (AM MINI LED) display device uses a large number of mini Light emitting diodes (mini-LEDs) as Light sources, and a Liquid crystal display panel (Liquid CRYSTAL DISPLAY, LCD) as a Color Filter (Color Filter) for expressing colors.
Since the response speed of the liquid crystal display panel is very slow, for example, only a few msec (10 -3 sec), two adjacent pictures are likely to overlap, and a blurring phenomenon (Motion Blur) of the pictures occurs. The blurring phenomenon may occur, for example, in a scene where a specific object moves rapidly, such as a sports competition, a closed caption scroll, a first person shooter game, or the like.
Therefore, how to reduce the blurring phenomenon is a more important issue.
Disclosure of Invention
The application provides a gray level compensation method, a gray level compensation device, a backlight driver and display equipment, which are used for reducing a blurring phenomenon.
In a first aspect, the present application provides a gray level compensation method, where a backlight unit includes a plurality of backlight drivers arranged in an array, where the method is applicable to a target backlight driver, where the target backlight driver is any backlight driver of the plurality of backlight drivers, and where the target backlight driver is connected to a target light emitting unit;
The method comprises the following steps:
When the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 th frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 th frame, and n is an integer larger than 1;
The actual gray level of the target light-emitting unit in the nth frame is regulated to the compensation gray level, so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference value, and the brightness difference is the difference value between the actual brightness and the target brightness; and the target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light-emitting unit is a second preset gray level.
In some embodiments, when the first difference value of the target light emitting unit is greater than a preset gray level difference value, determining the compensation gray level value corresponding to the target light emitting unit specifically includes:
Calculating a first difference between the first preset gray value and the second preset gray value;
and if the first difference value is larger than a preset gray level difference value, determining a compensation gray level value according to the characteristics of the liquid crystal display panel or determining the compensation gray level value according to a gray level lookup table.
In some embodiments, when the first difference value of the target light emitting unit is greater than a preset gray level difference value, determining the compensation gray level value corresponding to the target light emitting unit specifically includes:
Acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by a controller;
The controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and transmitting the compensation gray value to the target backlight driver.
In some embodiments, the controller comprises a dimming controller;
when the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit specifically comprises:
acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by the light-adjusting controller;
The dimming controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and transmitting the compensation gray value to the target backlight driver.
In some embodiments, the controller includes a dimming controller and a timing controller;
when the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit specifically comprises:
acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by the light-adjusting controller;
The time schedule controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and sending the compensation gray value to the dimming controller so as to send the compensation gray value to the target backlight driver through the dimming controller.
In some embodiments, the adjusting the actual gray value of the target light emitting unit at the nth frame to the compensated gray value specifically includes:
And adjusting the actual gray value of the target light emitting unit in the nth frame to the compensation gray value through a pulse amplitude modulation mode and/or a pulse width modulation mode.
In some embodiments, the compensated gray value is greater than the second preset gray value when the first preset gray value is less than the second preset gray value.
In some embodiments, the compensation gray value is less than the second preset gray value when the first preset gray value is greater than the second preset gray value.
In a second aspect, the present application provides a gray scale compensation device, wherein a backlight unit includes a plurality of backlight drivers arranged in an array, the device is adapted to a target backlight driver, the target backlight driver is any backlight driver of the plurality of backlight drivers, and the target backlight driver is connected to a target light emitting unit;
The device comprises:
The determining module is used for determining a compensation gray value corresponding to the target light-emitting unit when the first difference value of the target light-emitting unit is larger than a preset gray difference value; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 th frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 th frame, and n is an integer larger than 1;
The adjusting module is used for adjusting the actual gray level value of the target light-emitting unit in the nth frame to the compensation gray level value so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference value, and the brightness difference is the difference value between the actual brightness and the target brightness; and the target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light-emitting unit is a second preset gray level.
In a third aspect, the present application provides a backlight driver comprising: a memory and a processor;
the memory is used for storing instructions; the processor is configured to invoke instructions in the memory to perform the gray scale compensation method of the first aspect and any of the possible designs of the first aspect.
In a fourth aspect, the present application provides a display device comprising a backlight unit and a liquid crystal display panel, the backlight unit comprising the above-described backlight driver and a light emitting unit connected to the backlight driver;
the backlight driver is used for adjusting the gray scale of the light emitting unit to adjust the brightness of the liquid crystal display panel.
In a fifth aspect, the present application provides a computer readable storage medium having stored therein computer instructions which, when executed by at least one processor of an electronic device, perform the gray level compensation method of the first aspect and any of the possible designs of the first aspect.
In a sixth aspect, the application provides a computer program product comprising computer instructions which, when executed by at least one processor of an electronic device, perform the gray level compensation method of the first aspect and any of the possible designs of the first aspect.
The application provides a gray level compensation method, a device, a backlight driver and a display device, wherein a backlight unit comprises a plurality of backlight drivers which are arranged in an array, the method is suitable for a target backlight driver, the target backlight driver is any backlight driver in the plurality of backlight drivers, and the target backlight driver is connected with a target light-emitting unit, and the method comprises the following steps: when the first difference value of the target light-emitting unit is larger than the preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 frame, and the second preset gray value is a gray value of the target light-emitting unit in the n-1 frame; and then, adjusting the actual gray level of the target light-emitting unit in the nth frame to a compensation gray level so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference value, wherein the brightness difference is the difference value between the actual brightness and the target brightness, and the target brightness is the brightness of the liquid crystal display panel when the gray level of the target light-emitting unit in the nth frame is a second preset gray level. According to the scheme of the application, the response speed of the liquid crystal display panel can be shortened by increasing the gray level difference of the light emitting units between adjacent frames, so that the liquid crystal display panel can quickly reach a brightness approaching to the target brightness in the nth frame, the blurring phenomenon is reduced, excessive hardware circuit structures are not needed, and the cost is reduced.
Drawings
In order to more clearly illustrate the application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present application;
Fig. 2 is a schematic structural diagram of another display device according to an embodiment of the present application;
FIG. 3 is a flowchart illustrating a gray scale compensation method according to an embodiment of the present application;
FIG. 4 is a timing diagram of a pulse modulation scheme according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating a gray scale compensation method according to another embodiment of the present application;
FIG. 6 is a schematic diagram of pulse modulation timing and brightness according to an embodiment of the present application;
fig. 7 is a flowchart of a gray scale compensation method according to another embodiment of the present application;
FIG. 8 is a schematic diagram of pulse modulation timing and brightness according to another embodiment of the present application;
FIG. 9 is a schematic diagram of a gray scale compensation device according to an embodiment of the present application;
fig. 10 is a schematic diagram of a hardware structure of a backlight driver according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The response speed of the liquid crystal display panel refers to the speed of each pixel point of the liquid crystal display panel reacting to the input signal, i.e. the response time of the pixel from dark to bright or from bright to dark. The reaction time is divided into a rise time, which is a time required for a pixel to turn from dark to bright, or a time required for a voltage to go from low to high, and a fall time; the fall time refers to the time required for a pixel to go from bright to dark, or the time required for a voltage to go from high to low.
Since the response speed of the light emitting diode used as a light source in the backlight unit (for example, up to 10 -6 sec) is faster than that of the liquid crystal display panel, for example, it can be 1000 times faster. Therefore, the problem of the blurring phenomenon can be solved by:
1. Overdrive (Over Driving)/underdrive (Under Driving);
The overdrive technique increases the rise time of the liquid crystal display panel by increasing the rotation speed of the liquid crystal molecules; the low driving technique is to increase the falling time of the liquid crystal display panel by increasing the rotation speed of the liquid crystal molecules. The rotation speed of the liquid crystal molecules is a speed at which the liquid crystal molecules are rotated from the initial position to a certain angle, and the rotation speed is a speed at which the liquid crystal molecules are rotated from the certain angle to the initial position.
The overdrive technology specifically comprises the steps of instantly switching in a voltage slightly higher than the voltage required by the liquid crystal display panel and then reducing the voltage to a target voltage so as to improve the rotation speed of liquid crystal molecules and further improve the response speed of the liquid crystal display panel; the low driving technology is to increase the voltage to the target voltage after the voltage slightly lower than the voltage required by the liquid crystal display panel is accessed instantly, so as to increase the rotation speed of liquid crystal molecules and further increase the response speed of the liquid crystal display panel.
2. Frame rate multiplication (FRAME RATE Doubling), such as Motion estimation and Motion compensation (Motion ESTIMATE AND Motion Compensation, MEMC);
Motion estimation and motion compensation are used to avoid the problems of jitter, smear, and ghost, etc. occurring when a picture moves by inserting a motion compensation frame between two conventional frames and processing the original 24 frames of video into 60 frames or even 120 frames.
The frame rate multiplication mode can cause the problems of unclear edges of images in motion, unsmooth played images and the like. At present, the problem of the blurring phenomenon is mainly solved by adopting an overdrive technology/a low-drive technology.
In the overdrive/underdrive technique, overdrive (Driving) may cause a reverse simulation phenomenon, for example, a subsequent picture appears when a previous picture is displayed, which negatively affects the lifetime of the liquid crystal. In the overdrive/low-drive technology, one Frame of image data is required to be stored in a Frame Memory (Frame Memory) or one Line of image data is required to be stored in a Line Memory (Line Memory), so that a large Memory space is occupied, and the problem is solved by reducing the Memory capacity of the Frame Memory or the Line Memory by the Frame compression, line compression or data compression technology, but the hardware structure is complicated, the size is increased, and the cost is increased.
The application provides a gray level compensation method, which is suitable for any backlight driver, wherein when a first difference value between a first preset gray level value and a second preset gray level value of a light-emitting unit is larger than the preset gray level difference value, the backlight driver acquires a compensation gray level value, the first preset gray level value is the gray level value of the light-emitting unit in an n-1 frame, and the second preset gray level value is the gray level value of the light-emitting unit in the n frame. And then, the backlight driver adjusts the actual gray level of the light emitting unit in the nth frame to the compensation gray level, so that the brightness difference of the liquid crystal panel in the nth frame is smaller than a preset brightness difference value, and the brightness difference is the difference value between the actual brightness and the target brightness. The backlight driver increases the gray level difference between the adjacent frames of the light emitting units, so that the response speed of the liquid crystal display panel can be shortened, the liquid crystal display panel can quickly reach a brightness approaching to the target brightness in the nth frame, the blurring phenomenon is reduced, excessive hardware circuit structures are not needed, and the cost is reduced.
The technical scheme of the application is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
In order to facilitate understanding of the scheme of the present application, a display device provided by the embodiment of the present application is described first. As shown in fig. 1, the display apparatus includes a controller 500, a backlight Unit 100 (BLU), and a liquid crystal display panel 200. The backlight unit 100 may include a plurality of backlight drivers 10 arranged in an array, and a plurality of light emitting units 30 connected to each of the backlight drivers 10, and the light emitting units 30 may be LEDs, for example. The controller 500 is configured to generate display data (DISPLAY DATA) and Local dimming data (Local DIMMER DATA) according to video data, send the display data to the liquid crystal display panel 200, send the Local dimming data to the backlight driver 10, and the display data is used to drive the liquid crystal display panel 200 to operate, where the Local dimming data is used to drive each backlight driver 10 to provide backlight driving signals to the corresponding light emitting units 30, and the backlight driving signals can control the light emitting brightness of the light emitting units 30, so as to provide backlights with different brightness.
In some embodiments, as shown in fig. 2, the controller 500 includes a timing controller (Timing Controller, TCON) 400 and a dimming controller 300. The timing controller 400 is used for generating display data (DISPLAY DATA) and Local dimming data (Local DIMMER DATA) from video data, transmitting the display data to the liquid crystal display panel 200, and transmitting the Local dimming data to the dimming controller 300. The dimming controller 300 is used for generating local dimming data of each backlight region 30 for the local dimming data of the entire backlight unit 100, and transmitting the local dimming data of each backlight region 30 to each backlight driver 10. Each backlight driver 10 supplies a backlight driving signal to the light emitting unit 30, and the backlight driving signal can control the light emitting brightness of the light emitting unit 30, thereby providing backlights with different brightness.
It should be noted that, the functions of the timing controller 400 and the dimming controller 300 may be adaptively adjusted, for example: the timing controller 400 may transmit image data to the dimming controller 300, and calculate local dimming data by a dimming algorithm built in the dimming controller 300. The dimming controller 300 may also be omitted, and the local dimming data may be transmitted to the driving unit by the timing controller 400. That is, without limiting the architecture of the display device to the architecture shown in fig. 2, fig. 2 is merely an example architecture of a display device.
Next, a gray scale compensation method provided by an embodiment of the present application is described, and fig. 3 shows a flowchart of a gray scale compensation method provided by an embodiment of the present application. The method of the present embodiment may be applied to any backlight driver in a backlight unit, which will be referred to as a target backlight driver for convenience of description, the target backlight driver being connected to a target light emitting unit, and the method of the present embodiment includes the steps of:
And S101, when the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit.
The first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 frame, and n is an integer greater than 1. It should be noted that the first difference value is an absolute value of the finger difference value, and the preset gray difference value may be determined according to an actual situation.
The first preset gray value can be understood as the gray value of the target light-emitting unit in the n-1 frame when the gray value of the target light-emitting unit in the n-1 frame is not compensated; the second preset gray value can be understood as the gray value of the target light-emitting unit in the nth frame when the gray value of the target light-emitting unit in the nth frame is not compensated; the compensation gray value may be understood as a gray value of the target light emitting unit at the nth frame after the gray value of the target light emitting unit at the nth frame is compensated.
In some embodiments, the target backlight driver may determine the compensation gray value according to the first preset gray value and the second preset gray value. Specifically, the target backlight driver may calculate a first difference between a first preset gray value and a second preset gray value, and determine a compensation gray value according to a characteristic of the liquid crystal display panel or determine the compensation gray value according to a Look Up Table (LUT) if the first difference is greater than the preset gray value.
It should be noted that if the liquid crystal display panel has too high brightness, the aging process of the liquid crystal display panel may be accelerated, the power consumption of the liquid crystal display panel may be increased, and the liquid crystal display panel may have a corresponding brightness limitation. Accordingly, the determination of the compensation gray value according to the characteristics of the liquid crystal display panel may be the determination of the compensation gray value according to the brightness limitation of the liquid crystal display panel.
In practical applications, the compensation gray value may be preset and recorded in the gray lookup table, specifically, the corresponding compensation gray value may be set according to the preset gray difference, for example, the first preset gray value is 10, the second preset gray value is 100, the first difference between the first preset gray value and the second preset gray value is 90, and the compensation gray value may be set to 130. Correspondingly, when the first difference value is larger than the preset gray difference value, the corresponding compensation gray value can be searched in the gray lookup table according to the preset gray difference value.
In some embodiments, the controller may determine the compensation gray value according to the first preset gray value and the second preset gray value, and transmit the compensation gray value to the target backlight driver. Specifically, the controller calculates a first difference between the first preset gray value and the second preset gray value, determines a compensation gray value when the first difference is greater than the preset gray difference, and sends the compensation gray value to the target backlight driver. For example, the controller determines the compensation gray value according to the characteristics of the liquid crystal display panel or determines the compensation gray value according to a gray lookup table.
It should be noted that, if the target backlight driver is the first backlight driver of any column, the controller may directly send the compensated gray value to the first backlight driver of the column; if the target backlight driver is the nth backlight driver of any column, N is an integer greater than 1, the controller may send the compensated gray value to the first backlight driver of the column, and the backlight driver of the column sends the compensated gray value to the second backlight driver until the compensated gray value is sent to the nth backlight driver.
As one implementation, the controller includes a dimming controller and a timing controller, and the dimming controller may determine the compensation gray value according to the first preset gray value and the second preset gray value. Specifically, the dimming controller calculates a first difference between a first preset gray value and a second preset gray value, determines a compensation gray value when the first difference is greater than the preset gray value, and transmits the compensation gray value to the target backlight driver. For example, the dimming controller determines the compensation gray value according to the characteristics of the liquid crystal display panel or determines the compensation gray value according to the gray lookup table.
It should be noted that, the dimming controller is connected to the first backlight driver of each column, and if the target backlight driver is the first backlight driver of any column, the dimming controller may directly send the compensated gray value to the first backlight driver of the column; if the target backlight driver is the nth backlight driver of any column, N is an integer greater than 1, the dimming controller may transmit the compensation gray level value to the first backlight driver of the column, and the backlight driver of the column transmits the compensation gray level value to the second backlight driver until the compensation gray level value is transmitted to the nth backlight driver.
As another implementation, the timing controller may determine the compensation gray value according to the first preset gray value and the second preset gray value, and transmit the compensation gray value to the dimming controller, and transmit the compensation gray value to the target backlight driver through the dimming controller. Specifically, the timing controller calculates a first difference between a first preset gray value and a second preset gray value, determines a compensation gray value when the first difference is greater than the preset gray value, sends the compensation gray value to the dimming controller, and sends the compensation gray value to the target backlight driver through the dimming controller. For example, the timing controller determines the compensation gray value according to the characteristics of the liquid crystal display panel or determines the compensation gray value according to the gray lookup table.
S102, adjusting the actual gray level of the target light-emitting unit in the nth frame to the compensation gray level so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than the preset brightness difference.
The brightness difference is the difference between the actual brightness of the target light-emitting unit in the nth frame and the target brightness, and the target brightness is the brightness of the liquid crystal display panel when the gray level of the target light-emitting unit in the nth frame is the second preset gray level.
In the step, the actual gray level of the target light emitting unit in the nth frame is adjusted to the compensation gray level, and the gray level difference of the target light emitting unit between the adjacent frames is further increased under the condition that the gray level difference exists between the adjacent frames, so that the response speed of the liquid crystal display panel is improved by utilizing the faster response speed of the light emitting unit, the liquid crystal display panel can quickly reach a brightness approaching to the target brightness in the nth frame, and the response time of the liquid crystal display device is shortened.
In some embodiments, the actual gray value of the target light emitting unit at the nth frame is adjusted to the compensated gray value by a pulse amplitude modulation (Pulse Amplitude Modulation, PAM) mode, and/or a pulse width modulation (Pulse width modulation, PWM) mode.
For example, when the second preset gray value of the target light emitting unit is greater than the first preset gray value, the compensation gray value is greater than the second preset gray value. The pulse amplitude can be increased in the nth frame so that the actual gray value of the target light-emitting unit in the nth frame reaches the compensation gray value; the pulse width can be increased in the nth frame so that the actual gray value of the target light-emitting unit in the nth frame reaches the compensation gray value; the pulse width may be increased at the same time as the pulse amplitude is increased in the nth frame so that the actual gray value of the target light emitting unit in the nth frame reaches the compensation gray value, as shown in fig. 4, and fig. 4 shows a timing chart of the pulse modulation scheme. Then, the pulse amplitude and/or the pulse width can be reduced in the n+1th frame, so that the actual gray scale of the target light emitting unit in the n+1th frame reaches a second preset gray scale value, and correspondingly, the brightness of the liquid crystal display panel in the n+1th frame reaches the target brightness. The pulse signal is a frame synchronization signal (VSYNC), and indicates that one frame is one screen of the liquid crystal display.
For example, when the second preset gray value of the target light emitting unit is smaller than the first preset gray value, the compensation gray value is smaller than the second preset gray value. The pulse amplitude can be reduced in the nth frame so that the actual gray value of the target light emitting unit in the nth frame reaches the compensation gray value; the pulse width can be reduced in the nth frame so that the actual gray value of the target light-emitting unit in the nth frame reaches the compensation gray value; the pulse amplitude may be reduced at the nth frame while the pulse width is reduced so that the actual gray value of the target light emitting unit at the nth frame reaches the compensation gray value. Then, the pulse amplitude and/or the pulse width can be increased in the n+1th frame, so that the actual gray scale of the target light emitting unit in the n+1th frame reaches a second preset gray scale value, and correspondingly, the brightness of the liquid crystal display panel in the n+1th frame reaches the target brightness.
According to the gray level compensation method provided by the embodiment, when the first difference value between the gray level value of the n-1 frame and the gray level value of the n frame of the light emitting unit is larger than the preset gray level difference value, the backlight driver obtains the compensation gray level value, and adjusts the actual gray level value of the n frame of the light emitting unit to the compensation gray level value, so that the difference value between the actual brightness of the n frame of the liquid crystal panel and the target brightness is smaller than the preset brightness difference value. The backlight driver increases the gray level difference between the adjacent frames of the light emitting units, so that the response speed of the liquid crystal display panel can be shortened, the liquid crystal display panel can quickly reach a brightness approaching to the target brightness in the nth frame, the blurring phenomenon is reduced, excessive hardware circuit structures are not needed, and the cost is reduced.
Fig. 5 shows a flowchart of a gray level compensation method according to an embodiment of the application. As shown in fig. 5, the method of the present embodiment may be applied to a target backlight driver, and the method of the present embodiment includes the steps of:
S201, when the first preset gray value of the target light-emitting unit is smaller than the second preset gray value and the first difference value between the first preset gray value and the second preset gray value is larger than the preset gray difference value, acquiring a gray compensation value corresponding to the target light-emitting unit.
The gray compensation value is larger than the second preset gray value.
In this step, when moving from the n-1 th frame to the n-th frame, it is necessary to control the light emitting unit to emit light from a low gray level to a relatively high gray level or a very high gray level, and at this time, the gray level value of the target light emitting unit to which the target backlight driver is connected is acquired.
S202, increasing the actual gray level of the target light emitting unit in the nth frame to the compensation gray level so that the difference between the actual brightness of the liquid crystal display device in the nth frame and the target brightness is smaller than the preset brightness difference.
The target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light emitting unit is the second preset gray level.
In some embodiments, the gray value of the light emitting unit at the nth frame may be increased using an overdrive technique at the nth frame. Specifically, the pulse amplitude may be increased in the nth frame so that the actual gray value of the target light emitting unit in the nth frame reaches the compensation gray value; the pulse width can be increased in the nth frame so that the actual gray value of the target light-emitting unit in the nth frame reaches the compensation gray value; the pulse amplitude may be increased at the nth frame while the pulse width is increased so that the actual gray value of the target light emitting unit at the nth frame reaches the compensation gray value, as shown in (c) of fig. 6. Referring also to fig. 6 (b), the abscissa of fig. 6 (b) represents the response time, the ordinate represents the brightness of the liquid crystal display panel, the curve a of fig. 6 (b) represents the response time of the liquid crystal display panel before gray-scale compensation, and the curve b of fig. 6 (b) represents the response time of the liquid crystal display panel after gray-scale compensation. As can be seen from fig. 6 (b), the target brightness can be reached faster after the gray level compensation, for example, the target brightness can be reached in the n+1th frame, and the target brightness can be reached slower before the gray level compensation, for example, the target brightness can be reached in the n+2th frame. After the actual gray level value of the nth frame is compensated to the compensated gray level value, the pulse amplitude and/or the pulse width may be reduced in the (n+1) th frame, so that the actual gray level of the target light emitting unit in the (n+1) th frame reaches the second preset gray level value.
According to the gray level compensation method provided by the embodiment, when the first difference value between the first preset gray level value of the n-1 frame and the second preset gray level value of the n-1 frame of the light emitting unit is larger than the preset gray level difference value and the first preset gray level value is smaller than the second preset gray level value, the backlight driver obtains the compensation gray level value, adjusts the actual gray level value of the light emitting unit in the n-1 frame to the compensation gray level value, and increases the gray level difference between the adjacent frames of the light emitting unit due to the fact that the compensation gray level value is larger than the second preset gray level value, so that the response speed of the liquid crystal display panel can be shortened, the brightness approaching to the target brightness can be quickly achieved in the n-1 frame of the liquid crystal display panel, the blurring phenomenon is reduced, excessive hardware circuit structures are not needed, and the cost is reduced.
Fig. 7 is a flowchart of a gray level compensation method according to an embodiment of the application. As shown in fig. 7, the method of the present embodiment may be applied to a target backlight driver, and the method of the present embodiment includes the steps of:
S301, acquiring a gray compensation value corresponding to the target light-emitting unit when a first preset gray value of the target light-emitting unit is larger than a second preset gray value and a first difference value between the first preset gray value and the second preset gray value is larger than the preset gray difference value.
The gray compensation value is smaller than a second preset gray value.
In this step, when moving from the n-1 th frame to the n-th frame, it is necessary to control the light emitting unit to emit light from a high gray level to a relatively low gray level or a very low gray level, and at this time, the gray level value of the target light emitting unit to which the target backlight driver is connected is acquired.
S302, reducing the actual gray level of the target light emitting unit in the nth frame to the compensation gray level so that the difference between the actual brightness of the liquid crystal display device in the nth frame and the target brightness is smaller than the preset brightness difference.
The target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light emitting unit is the second preset gray level.
In some embodiments, the gray value of the light emitting unit at the nth frame may be reduced using a low driving technique at the nth frame. Specifically, the pulse amplitude may be reduced in the nth frame so that the actual gray value of the target light emitting unit in the nth frame reaches the compensation gray value; the pulse width can be reduced in the nth frame so that the actual gray value of the target light-emitting unit in the nth frame reaches the compensation gray value; the pulse amplitude may be reduced at the nth frame while the pulse width is reduced so that the actual gray value of the target light emitting unit at the nth frame reaches the compensation gray value, as shown in (c) of fig. 8. Referring also to fig. 8 (b), the abscissa of fig. 8 (b) represents the response time, the ordinate represents the brightness of the liquid crystal display panel, the curve c of fig. 8 (b) represents the response time of the liquid crystal display panel before gray scale compensation, and the curve d of fig. 8 (b) represents the response time of the liquid crystal display panel after gray scale compensation. As can be seen from fig. 8 (b), the target brightness can be reached faster after the gray level compensation, for example, the target brightness can be reached in the n+1th frame, and the target brightness can be reached slower before the gray level compensation, for example, the target brightness can be reached in the n+2th frame. After the actual gray level value of the nth frame is compensated to the compensated gray level value, the pulse amplitude and/or the pulse width may be increased in the (n+1) th frame, so that the actual gray level of the target light emitting unit in the (n+1) th frame reaches the second preset gray level value.
According to the gray level compensation method provided by the embodiment, when the first difference value between the first preset gray level value of the n-1 frame and the second preset gray level value of the n-1 frame of the light emitting unit is larger than the preset gray level difference value and the first preset gray level value is larger than the second preset gray level value, the backlight driver obtains the compensation gray level value, adjusts the actual gray level value of the light emitting unit in the n-1 frame to the compensation gray level value, and increases the gray level difference between the adjacent frames of the light emitting unit due to the fact that the compensation gray level value is smaller than the second preset gray level value, so that the response speed of the liquid crystal display panel can be shortened, the brightness approaching to the target brightness can be quickly achieved in the n-1 frame of the liquid crystal display panel, the blurring phenomenon is reduced, excessive hardware circuit structures are not needed, and the cost is reduced.
Fig. 9 is a schematic structural diagram of a gray scale compensation device according to an embodiment of the present application, and as shown in fig. 9, the gray scale compensation device 10 according to the present embodiment is used for implementing the operation corresponding to the target backlight driver in any of the above method embodiments, and the gray scale compensation device 10 according to the present embodiment includes:
A determining module 11, configured to determine a compensation gray value corresponding to the target light emitting unit when the first difference of the target light emitting unit is greater than a preset gray difference; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 th frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 th frame, and n is an integer larger than 1;
The adjusting module 12 is configured to adjust an actual gray value of the target light emitting unit in the nth frame to the compensated gray value, so that a brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference, where the brightness difference is a difference between the actual brightness and the target brightness; and the target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light-emitting unit is a second preset gray level.
The gray level compensation device 10 provided in the embodiment of the present application may execute the above-mentioned method embodiment, and the specific implementation principle and technical effects thereof may be referred to the above-mentioned method embodiment, and this embodiment is not repeated here.
Fig. 10 shows a schematic hardware structure of a backlight driver according to an embodiment of the present application. As shown in fig. 10, the backlight driver 20 for implementing the operation corresponding to the backlight driver in any of the above method embodiments, the backlight driver 20 of this embodiment may include: a memory 21, a processor 22 and a communication interface 23.
A memory 21 for storing computer instructions. The Memory 21 may include a high-speed random access Memory (Random Access Memory, RAM), and may further include a Non-Volatile Memory (NVM), such as at least one magnetic disk Memory, and may also be a U-disk, a removable hard disk, a read-only Memory, a magnetic disk, or an optical disk. A processor 22 for executing computer instructions stored in a memory to implement the gray scale compensation method in the above embodiment. Reference may be made in particular to the relevant description of the embodiments of the method described above. The Processor 22 may be a central processing unit (Central Processing Unit, CPU), or may be other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in a processor for execution.
Alternatively, the memory 21 may be separate or integrated with the processor 22. The communication interface 23 may be coupled to the processor 22. The processor 22 may control the communication interface 23 to perform the functions of receiving and transmitting signals.
The backlight driver provided in this embodiment may be used to perform the gray level compensation method described above, and its implementation manner and technical effects are similar, and this embodiment will not be described herein.
The display device provided by the embodiment of the application comprises a backlight unit and a liquid crystal display panel, wherein the backlight unit comprises the backlight driver and a light emitting unit connected with the backlight driver; the backlight driver is used for adjusting the gray scale of the light emitting unit to adjust the brightness of the liquid crystal display panel.
As an implementation, the light emitting unit may be an active matrix type mini light emitting diode. The active matrix type mini light emitting diode can realize ultra-high contrast ratio by combining with fine overall brightness adjustment (local dimming), and brightness and contrast ratio are improved.
The present application also provides a computer readable storage medium having stored therein computer instructions which, when executed by a processor, are adapted to carry out the methods provided by the various embodiments described above.
The present application also provides a computer program product comprising computer instructions stored in a computer readable storage medium. The computer instructions may be read from a computer-readable storage medium by at least one processor of the device, and executed by the at least one processor, cause the device to implement the methods provided by the various embodiments described above.
The embodiment of the application also provides a chip, which comprises a memory and a processor, wherein the memory is used for storing computer instructions, and the processor is used for calling and running the computer instructions from the memory, so that a device provided with the chip executes the method in various possible implementation manners.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same. Although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents. Such modifications and substitutions do not depart from the spirit of the application.

Claims (11)

1. A gray scale compensation method, wherein a backlight unit comprises a plurality of backlight drivers arranged in an array, the method is suitable for a target backlight driver, the target backlight driver is any backlight driver in the plurality of backlight drivers, and the target backlight driver is connected with a target light-emitting unit;
The method comprises the following steps:
When the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 th frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 th frame, and n is an integer larger than 1;
The actual gray level of the target light-emitting unit in the nth frame is regulated to the compensation gray level, so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference value, and the brightness difference is the difference value between the actual brightness and the target brightness; and the target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light-emitting unit is a second preset gray level.
2. The method according to claim 1, wherein when the first difference value of the target light emitting unit is greater than a preset gray level difference value, determining the compensation gray level value corresponding to the target light emitting unit specifically includes:
Calculating a first difference between the first preset gray value and the second preset gray value;
and if the first difference value is larger than a preset gray level difference value, determining a compensation gray level value according to the characteristics of the liquid crystal display panel or determining the compensation gray level value according to a gray level lookup table.
3. The method according to claim 1, wherein when the first difference value of the target light emitting unit is greater than a preset gray level difference value, determining the compensation gray level value corresponding to the target light emitting unit specifically includes:
Acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by a controller;
The controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and transmitting the compensation gray value to the target backlight driver.
4. A method according to claim 3, wherein the controller comprises a dimming controller;
when the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit specifically comprises:
acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by the light-adjusting controller;
The dimming controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and transmitting the compensation gray value to the target backlight driver.
5. A method according to claim 3, wherein the controller comprises a dimming controller and a timing controller;
when the first difference value of the target light-emitting unit is larger than a preset gray level difference value, determining a compensation gray level value corresponding to the target light-emitting unit specifically comprises:
acquiring a compensation gray value corresponding to the target light-emitting unit, wherein the compensation gray value is sent by the light-adjusting controller;
The time schedule controller is used for calculating a first difference value between the first preset gray value and the second preset gray value; and when the first difference value is larger than a preset gray difference value, determining the compensation gray value and sending the compensation gray value to the dimming controller so as to send the compensation gray value to the target backlight driver through the dimming controller.
6. The method according to any one of claims 1-5, wherein said adjusting the actual gray value of the target lighting unit at the nth frame to the compensated gray value comprises:
And adjusting the actual gray value of the target light emitting unit in the nth frame to the compensation gray value through a pulse amplitude modulation mode and/or a pulse width modulation mode.
7. The method of any one of claims 1-5, wherein the compensated gray value is greater than the second preset gray value when the first preset gray value is less than the second preset gray value.
8. The method of any one of claims 1-5, wherein the compensated gray value is less than the second preset gray value when the first preset gray value is greater than the second preset gray value.
9. A gray scale compensation device, characterized in that a backlight unit comprises a plurality of backlight drivers arranged in an array, the device is suitable for a target backlight driver, the target backlight driver is any backlight driver in the plurality of backlight drivers, and the target backlight driver is connected with a target light emitting unit;
The device comprises:
The determining module is used for determining a compensation gray value corresponding to the target light-emitting unit when the first difference value of the target light-emitting unit is larger than a preset gray difference value; the first difference value is a difference value between a first preset gray value and a second preset gray value, the first preset gray value is a gray value of the target light-emitting unit in an n-1 th frame, the second preset gray value is a gray value of the target light-emitting unit in the n-1 th frame, and n is an integer larger than 1;
The adjusting module is used for adjusting the actual gray level value of the target light-emitting unit in the nth frame to the compensation gray level value so that the brightness difference of the liquid crystal display panel in the nth frame is smaller than a preset brightness difference value, and the brightness difference is the difference value between the actual brightness and the target brightness; and the target brightness is the brightness of the liquid crystal display panel when the gray level of the nth frame of the target light-emitting unit is a second preset gray level.
10. A backlight driver, comprising: a memory, a processor, and a memory communicatively coupled to the processor;
The memory is used for storing computer execution instructions;
The processor is configured to execute instructions according to a computer stored in the memory to implement the method according to any one of claims 1 to 8.
11. A display device comprising a backlight unit and a liquid crystal display panel, the backlight unit comprising the backlight driver of claim 10 and a light emitting unit connected to the backlight driver;
the backlight driver is used for adjusting the gray scale of the light emitting unit to adjust the brightness of the liquid crystal display panel.
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