CN112735343B - Light-emitting component dimming control method and device and display device - Google Patents

Light-emitting component dimming control method and device and display device Download PDF

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CN112735343B
CN112735343B CN202110004708.4A CN202110004708A CN112735343B CN 112735343 B CN112735343 B CN 112735343B CN 202110004708 A CN202110004708 A CN 202110004708A CN 112735343 B CN112735343 B CN 112735343B
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light
emitting component
analog signal
gray
signal parameter
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CN112735343A (en
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罗艳梅
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Chengdu BOE Display Technology Co Ltd
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Chengdu CEC Panda Display Technology Co Ltd
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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
    • G09G3/3406—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

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

Abstract

The invention provides a light-emitting component dimming control method, a light-emitting component dimming control device and a display device, wherein the method comprises the following steps: inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to the preset group number so as to scan the light-emitting component in preset group number scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage; and inputting a first analog signal parameter or a second analog signal parameter corresponding to each scanning stage to the light-emitting component when the light-emitting component is scanned in each scanning stage according to the target gray value, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel. The embodiment of the invention can avoid the problem of easy flicker in low gray scale and improve the dimming precision.

Description

Light-emitting component dimming control method and device and display device
Technical Field
The embodiment of the invention relates to the technical field of display equipment, in particular to a light-emitting component dimming control method and device and a display device.
Background
Liquid crystal display devices are generally composed of optical elements such as liquid crystal panels, and are widely used in liquid crystal televisions, computers, and the like. In a Dimming control method for a light emitting device (backlight LED) of a liquid crystal display device, a Local Dimming technique is generally used to change the luminance of the backlight LED according to the brightness of a display screen, so as to achieve the effects of increasing the contrast of the screen, improving the image quality, and reducing the power consumption.
At present, in traditional light emitting component adjusted luminance, mainly relate to two kinds of modes of adjusting luminance: pulse width Dimming (PWM Dimming), i.e., digital Dimming; and Analog Dimming (Analog Dimming). The digital dimming is realized by changing the pulse width to adjust the brightness; the analog dimming is realized by controlling the light-emitting component to be in a conducting state and changing the current (or voltage) of the light-emitting component to realize different brightness.
However, in the digital dimming method, the problem of flicker is easily caused due to too small duty ratio at low gray; the analog dimming mode has the problems of limited dimming range and low dimming precision when used for multi-gray-scale dimming. Therefore, there is a need for a method for dimming a light emitting device, which can avoid the problem of flicker in low gray scale and improve the dimming accuracy.
Disclosure of Invention
The embodiment of the invention provides a light-emitting component dimming control method, a light-emitting component dimming control device and a display device, which can avoid the problem that flicker is easy to occur in low gray scale and can improve dimming precision.
In a first aspect, an embodiment of the present invention provides a method for controlling dimming of a light emitting device, including:
acquiring each frame of picture input into the display device, and determining a target gray value of any pixel in each frame of picture;
for any pixel in each frame of picture, the following steps are executed:
inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage;
according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; and the second analog signal parameter is used for closing the light-emitting component.
In a possible design, before acquiring each frame of the image input to the display device and determining the target grayscale value of any pixel in each frame of the image, the method further includes:
grouping the gray levels of the display device according to the image depth values to obtain the preset group number of set gray values;
and determining a first analog signal parameter corresponding to each set of set gray values, wherein each scanning stage corresponds to one first analog signal parameter.
In a possible design, when the light emitting device is scanned in each scanning stage according to the target gray value, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage to the light emitting device, so that the gray value superposed after the light emitting device passes through the scanning stages of the preset number of groups is equal to the target gray value of any pixel; wherein, the second analog signal parameter is used for closing the light emitting component, and comprises:
determining a set gray value combination for realizing the target gray value from the preset group number of set gray values according to the target gray value; selecting a target scanning stage corresponding to the combination of the target gray values in a plurality of scanning stages in a preset group, and inputting corresponding first analog signal parameters to the light-emitting component, wherein the target gray values are equal to the target gray values after the set gray values corresponding to the corresponding first analog signal parameters are superposed; and inputting corresponding second analog signal parameters to the light-emitting component in other scanning stages except the target scanning stage in a plurality of scanning stages in a preset group.
In one possible design, the digital signal parameter is a preset number of groups of PWM signals, where the pulse width of each group of PWM signals is proportional to the preset number of groups of gray scale values.
In one possible design, the digital signal parameter is a preset number of groups of PWM signals, where the PWM signals of each group have equal pulse widths.
In one possible design, each frame of the picture is a color image; the determining the target gray value of any pixel in each frame of picture comprises the following steps: converting each frame of picture into a gray image; and processing the gray image by adopting a gray extraction algorithm to obtain a target gray value of any pixel.
In a second aspect, an embodiment of the present invention provides a light-emitting device dimming control apparatus, including:
the acquisition module is used for acquiring each frame of picture input into the display device and determining a target gray value of any pixel in each frame of picture;
a control module, configured to perform the following steps for any pixel in each frame of the picture: inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage; according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; and the second analog signal parameter is used for closing the light-emitting component.
In a third aspect, an embodiment of the present invention provides a controller, including: the device comprises a controller, a power supply module, a first driving module, a second driving module and a light-emitting component;
the power supply module supplies power to the light-emitting component;
the first driving module is used for inputting a first analog signal parameter or a second analog signal parameter to the light-emitting component;
the second driving module is used for inputting digital signal parameters to the light-emitting component;
the controller is used for controlling the power supply module, the first driving module and the second driving module;
the controller comprises at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored by the memory, so that the at least one processor executes the light emitting device dimming control method according to the first aspect and various possible designs of the first aspect.
In one possible design, the light-emitting component comprises a control switch tube and a driving switch tube;
the first driving module is connected with a source electrode of the control switch tube, and the second driving module is connected with a grid electrode of the control switch tube;
and the grid electrode of the driving switch tube is connected with the drain electrode of the control switch tube, and the source electrode and the drain electrode of the driving switch tube are respectively connected with the power supply module.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the method for dimming a light emitting device according to the first aspect and various possible designs of the first aspect is implemented.
In a fifth aspect, an embodiment of the present invention provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for dimming a light emitting device according to the first aspect and various possible designs of the first aspect is implemented.
According to the light-emitting component dimming control method, the light-emitting component dimming control device and the display device, the gray levels of the display device are grouped according to the image depth value to obtain the gray-scale value of the preset group number; determining a first analog signal parameter corresponding to each group of gray scale values; and then, for each frame of picture, scanning light-emitting components of the display device according to preset digital signal parameters and preset groups of scanning times, and inputting a first analog signal parameter or a second analog signal parameter to the light-emitting components when scanning the light-emitting components each time, so that the superposed gray value of the light-emitting components after scanning by the preset groups is equal to the target gray value of any pixel, and dimming control of the light-emitting components is completed. Because each frame of picture needs to be scanned in a preset group number stage, the scanning time of each frame of picture is increased, and compared with the prior digital dimming method, each frame of picture is scanned only once, so that the problem of easy flicker generation in low gray level is avoided; meanwhile, the gray levels are grouped according to the image depth values, the light is adjusted according to the gray level value superposition of the preset group number, the light adjusting gradient is the preset group number, compared with the light adjusting gradient (same as the gray level) of the existing analog light adjusting, the light adjusting gradient is greatly reduced, the range of the control voltage (current) required after the light adjusting gradient is reduced is enlarged, the control is easier, the light adjusting precision is better, and the light adjusting efficiency is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention;
fig. 2 is a first schematic flow chart of a light-emitting device dimming control method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart illustrating a second method for controlling dimming of a light emitting device according to an embodiment of the present invention;
fig. 4 is a third schematic flow chart of a dimming control method for a light emitting device according to an embodiment of the present invention;
FIG. 5 is a digital signal diagram showing the pulse width of each PWM signal in proportion to the set gray-scale value;
FIG. 6 is a schematic diagram of a final driving signal obtained by superimposing the first analog signal parameter and the second analog signal parameter corresponding to FIG. 5;
FIG. 7 is a signal diagram illustrating equal pulse widths of PWM signals for each group;
FIG. 8 is a schematic diagram of a final driving signal obtained by superimposing the first analog signal parameter and the second analog signal parameter corresponding to FIG. 7;
fig. 9 is a schematic structural diagram of a light-emitting device dimming control apparatus according to an embodiment of the present invention;
fig. 10 is a schematic diagram of a hardware structure of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The light-emitting component dimming mode of the traditional liquid crystal display device mainly relates to two dimming modes: pulse width dimming, i.e. digital dimming; and analog dimming. The digital dimming is realized by changing the pulse width to adjust the brightness; the analog dimming is realized by controlling the light-emitting component to be in a conducting state and changing the current (or voltage) of the light-emitting component to realize different brightness. However, the inventor finds that at least the following technical problems exist in the two conventional dimming manners: namely, the digital dimming mode is easy to generate the problem of flicker due to too small duty ratio when the gray scale is low; the analog dimming mode has the problems of limited dimming range and low dimming precision when used for multi-gray-scale dimming.
Aiming at the problems, in order to realize a light-emitting component dimming method which can avoid the problem of low-gray-scale flicker and improve the dimming precision, the invention provides the following technical scheme: firstly, grouping the gray levels of a display device according to image depth values to obtain gray level values of the preset group number; determining a first analog signal parameter corresponding to each group of gray scale values; and then, for each frame of picture, scanning light-emitting components of the display device according to preset digital signal parameters and preset groups of scanning times, and inputting a first analog signal parameter or a second analog signal parameter to the light-emitting components when scanning the light-emitting components each time, so that the superposed gray value of the light-emitting components after scanning by the preset groups is equal to the target gray value of any pixel, and dimming control of the light-emitting components is completed. Because each frame of picture needs to be scanned in a preset group number stage, the scanning time of each frame of picture is increased, and compared with the prior digital dimming method, each frame of picture is scanned only once, so that the problem of easy flicker generation in low gray level is avoided; meanwhile, the gray levels are grouped according to the image depth values, the light is adjusted according to the gray level value superposition of the preset group number, the light adjusting gradient is the preset group number, compared with the light adjusting gradient (same as the gray level) of the existing analog light adjusting, the light adjusting gradient is greatly reduced, the range of the control voltage (current) required after the light adjusting gradient is reduced is enlarged, the control is easier, the light adjusting precision is better, and the light adjusting efficiency is improved.
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
In fig. 1, the lcd device includes an lcd backlight module and a controller. The liquid crystal display backlight module is used for providing backlight for the liquid crystal display device. The Controller may be a TCON (Time Controller) or other Controller connected to the backlight module of the liquid crystal display. The backlight signal may come from other devices, such as a set-top box, a computer, etc.
Fig. 2 is a first flowchart of a light-emitting device dimming control method according to an embodiment of the present invention. The method can be applied to the controller in fig. 1, and as shown in fig. 2, the method includes:
s201: acquiring each frame of picture input into the display device, and determining the target gray value of any pixel in each frame of picture.
In this embodiment, each frame of picture is an image input to the display device, and the image may be a color image or a grayscale image.
Specifically, if the picture is a color picture, converting each frame of picture into a gray image; and processing the gray image by adopting a gray extraction algorithm to obtain a target gray value of any pixel.
The conversion of the picture into the gray image can be realized by a gray processing method such as a floating point algorithm, an integer method, a shifting method, an average value method, a green-only method and the like.
The gray level extraction algorithm may be a modal method, a P parameter method, a variable threshold method, an Otsu method, an iterative approximation method, or the like.
Specifically, if the screen is a grayscale image, the target grayscale value of any pixel is directly extracted.
S202: the steps as S2021 to S2022 are performed for the any one pixel in each frame of picture.
S2021: inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage.
In this embodiment, for each frame, the preset number of sets of digital signal parameters may be sent to the first to last rows of light-emitting devices in the display device, so as to complete the scanning of the preset number of sets of light-emitting devices in the first to last rows.
The digital signal parameter of the preset number of groups may be a PWM (Pulse Width Modulation) signal. And scanning the preset groups of the light-emitting components, and controlling the opening of a control switch tube of the light-emitting components through PWM signals.
S2022: according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; and the second analog signal parameter is used for closing the light-emitting component.
In this embodiment, the scanning stages that need to send the corresponding first analog signal parameters are determined according to the target gray value, and the corresponding first analog signal parameters are sent to the light emitting device, so as to realize the set gray value corresponding to each scanning stage; and in other scanning stages, the second analog signal parameter closes the light-emitting component, and the gray value is 0. The set gray values corresponding to each scanning stage for sending the first analog signal parameter are added to be equal to the target gray value of any pixel.
As can be seen from the above description, in the present embodiment, since each frame of picture needs to be scanned by presetting a plurality of scanning stages, the scanning time of each frame of picture is increased, and compared with the existing digital dimming method in which each frame of picture is scanned only once, the problem of easy flicker during low gray level is avoided; meanwhile, the gray levels are grouped according to the image depth values, the light is adjusted according to the gray level value superposition of the preset group number, the light adjusting gradient is the preset group number, compared with the light adjusting gradient (same as the gray level) of the existing analog light adjusting, the light adjusting gradient is greatly reduced, the range of the control voltage (current) required after the light adjusting gradient is reduced is enlarged, the control is easier, the light adjusting precision is better, and the light adjusting efficiency is improved.
Fig. 3 is a schematic flow chart of a light-emitting device dimming control method according to an embodiment of the present invention. On the basis of the foregoing embodiment, in this embodiment, a detailed description is given to how to determine a process of determining a first analog signal parameter corresponding to each scanning stage, before step S201, the method for controlling dimming of a light emitting device further includes:
s301: and grouping the gray levels of the display device according to the image depth values to obtain the preset group number of set gray values.
In the present embodiment, each display device model is different, and its corresponding gray scale level is also different. Suppose the display device has a gray scale level of 2nWhere n is the image depth value. The gray level of the display device is 2n, and the display device is grouped into the following parts according to the image depth values: the first group is 20Gray value of 2 in the second group1Gray value of 2 for the third group2A gray-scale value of 2 for the nth group(n-1)A grey value.
For example for 28Gray scale (image depth)8 bits), a total of 8 groups of gray values: 1. 2, 4, 8, 16, 32, 64, 128.
S302: and determining a first analog signal parameter corresponding to each set of set gray values, wherein each scanning stage corresponds to one first analog signal parameter.
In this embodiment, a first analog signal parameter required by the light emitting device to realize each group of gray scale values is determined according to the light emitting characteristics of the light emitting device, and the first analog signal parameter may be a current amplitude or a voltage amplitude.
Each scanning stage corresponds to one first analog signal parameter, and may correspond to a forward ordering of values corresponding to the scanning stage and the first analog signal parameter, a reverse ordering of values corresponding to the first analog signal parameter, or a random ordering of values corresponding to the first analog signal parameter.
For example, table 1 is a table of forward ordering correspondence of values corresponding to the first analog signal parameter during the scanning phase.
TABLE 1
Scanning phase Setting gray value First analog signal parameter
1 1 a
2 2 b
3 4 c
4 8 d
5 16 e
6 32 f
7 64 g
8 128 h
The first analog signal parameter may be set according to different requirements of the lcd device, for example, in one example, the first analog signal parameter takes values of 0.13, 0.18, 0.24, 0.32, 0.42, 0.56, 0.75, and 1.00 (normalized values) at each stage.
As can be seen from the above description, the gray levels of the display device are grouped according to the depth values of the image to obtain the preset groups of set gray values, and the first analog signal parameter corresponding to each group of set gray values is determined, wherein each scanning stage corresponds to one first analog signal parameter, so as to obtain the values of the set gray values, which can meet the requirement of superimposing the brightness of various gray values of the light-emitting device, and at the same time, the number of the set gray values is small, so that the dimming efficiency is improved.
Fig. 4 is a third schematic flowchart of a dimming control method for a light emitting device according to an embodiment of the present invention. On the basis of the above embodiment, the present embodiment describes a specific process of the above step S2022, which is detailed as follows:
s401: and determining to realize the combination of the target gray values from the preset groups of set gray values according to the target gray values.
In the present embodiment, the combination of the set gray-scale values is such that each set gray-scale value is equal to the target gray-scale value after being superimposed.
S402: and selecting a target scanning stage corresponding to the combination of the target gray values in a plurality of preset scanning stages, and inputting corresponding first analog signal parameters to the light-emitting component.
S403: and inputting corresponding second analog signal parameters to the light-emitting component in other scanning stages except the target scanning stage in a plurality of scanning stages in a preset group.
In the present embodiment, taking table 1 as an example, the predetermined set of the plurality of scanning stages corresponds to the forward sequence of the values corresponding to the first analog signal parameter.
If the target gray-scale value is 200, the first analog signal parameters corresponding to the gray-scale values (200 gray-scale values after superposition) set at 8, 64 and 128 are input in the 4 th, 7 th and 8 th scanning stages. And inputting a second analog signal parameter for turning off the light-emitting components in the scanning stages 1, 2, 3, 5, 6 and 8.
In an embodiment of the invention, the digital signal parameter is a preset number of groups of PWM signals, wherein the pulse width of each group of PWM signals is proportional to the preset number of groups of gray scale values. Continuing with table 1 as an example, fig. 5 is a schematic diagram of digital signals in which the pulse width of the PWM signal of each group is proportional to the set gray level.
The first analog signal parameter and the second analog signal parameter are current amplitude or voltage amplitude. The current amplitude or the voltage amplitude of the first analog signal parameter can enable the light-emitting source device to achieve a corresponding set gray value, and the current amplitude or the voltage amplitude of the second analog signal parameter can enable the light-emitting source device not to be bright.
When the pulse width of the PWM signal of each group is different, it is superimposed with the corresponding first analog signal parameter and second analog signal parameter to obtain the final driving signal, as shown in fig. 6.
From the above description, it can be known that the synchronous adjustment of the pulse width and the current amplitude or the voltage amplitude of the first analog signal parameter increases the scanning time for realizing the corresponding gray value, and is easier to realize the brightness control of the higher gray value.
In one embodiment of the present invention, the digital signal parameter is a preset number of groups of PWM signals, wherein the pulse widths of the PWM signals of each group are equal. Continuing with table 1 as an example, fig. 7 is a signal diagram illustrating PWM signals of each group having equal pulse widths.
When the pulse width of the PWM signal of each group is the same, it is superimposed with the corresponding first analog signal parameter and second analog signal parameter to obtain the final driving signal, as shown in fig. 8.
As can be seen from the above description, by setting the pulse widths to be equal, the scanning time of each stage is the same, and the scanning efficiency and the dimming efficiency can be improved.
Fig. 9 is a schematic structural diagram of a light-emitting device dimming control apparatus according to an embodiment of the present invention. As shown in fig. 9, the light emitting device dimming control apparatus 50 includes: an acquisition module 501 and a control module 502.
An obtaining module 501, configured to obtain each frame of image input to the display device, and determine a target gray value of any pixel in each frame of image;
a control module 502, configured to perform the following steps for any pixel in each frame: inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage; according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; and the second analog signal parameter is used for closing the light-emitting component.
As can be seen from the above description, in the present embodiment, since each frame of picture needs to be scanned by presetting a plurality of scanning stages, the scanning time of each frame of picture is increased, and compared with the existing digital dimming method in which each frame of picture is scanned only once, the problem of easy flicker during low gray level is avoided; meanwhile, the gray levels are grouped according to the image depth values, the light is adjusted according to the gray level value superposition of the preset group number, the light adjusting gradient is the preset group number, compared with the light adjusting gradient (same as the gray level) of the existing analog light adjusting, the light adjusting gradient is greatly reduced, the range of the control voltage (current) required after the light adjusting gradient is reduced is enlarged, the control is easier, the light adjusting precision is better, and the light adjusting efficiency is improved.
In one or more embodiments of the invention, further comprising: a gray grouping module 503, configured to group the gray levels of the display device according to the image depth values to obtain the preset number of groups of set gray values; determining a first analog signal parameter corresponding to each set of gray-level values, wherein each scanning stage corresponds to a first analog signal parameter
In one or more embodiments of the present invention, the control module 502 is specifically configured to determine, according to the target gray-level value, a set gray-level value combination for implementing the target gray-level value from the preset group number of set gray-level values; selecting a target scanning stage corresponding to the combination of the target gray values in a plurality of scanning stages in a preset group, and inputting corresponding first analog signal parameters to the light-emitting component, wherein the target gray values are equal to the target gray values after the set gray values corresponding to the corresponding first analog signal parameters are superposed; and inputting corresponding second analog signal parameters to the light-emitting component in other scanning stages except the target scanning stage in a plurality of scanning stages in a preset group.
In one or more embodiments of the present invention, the digital signal parameter is a preset number of groups of PWM signals, wherein the pulse width of each group of PWM signals is proportional to the preset number of groups of gray scale values.
In one or more embodiments of the present invention, the digital signal parameter is a preset number of groups of PWM signals, wherein the PWM signals of each group have equal pulse widths.
In one or more embodiments of the present invention, each frame of the picture is a color image; the obtaining module 501 is specifically configured to convert each frame of picture into a grayscale image; and processing the gray image by adopting a gray extraction algorithm to obtain a target gray value of any pixel.
The apparatus provided in this embodiment may be used to implement the technical solutions of the above method embodiments, and the implementation principles and technical effects are similar, which are not described herein again.
Fig. 10 is a schematic diagram of a hardware structure of a display device according to an embodiment of the present invention. As shown in fig. 10, the display device includes: a controller 601, a power module 602, a first driving module 603, a second driving module 604 and a light emitting device 605;
the power module 602 supplies power to the light emitting device; the first driving module 603 is configured to input a first analog signal parameter or a second analog signal parameter to the light emitting device; the second driving module 604 is configured to input digital signal parameters to the light emitting device; the controller 601 is configured to control the power module 602, the first driving module 603, and the second driving module 604. The controller 601 of the present embodiment includes: a processor and a memory; wherein the memory is used for storing computer execution instructions; and the processor is used for executing the computer execution instructions stored in the memory so as to realize the steps executed by the server in the embodiment. Reference may be made in particular to the description relating to the method embodiments described above.
Alternatively, the memory may be separate or integrated with the processor. When the memory is independently configured, the controller further includes a bus for connecting the memory and the processor.
In one or more embodiments of the present invention, the light emitting component includes a control switch transistor T1 and a driving switch transistor T2;
the first driving module 603 is connected to the source of the control switch transistor T1, and the second driving module 604 is connected to the gate of the control switch transistor T1;
the gate of the sum driving switch transistor T2 is connected to the drain of the control switch transistor T1, and the source and drain of the driving switch transistor T2 are connected to the power module 602, respectively.
The embodiment of the invention also provides a computer-readable storage medium, wherein a computer executing instruction is stored in the computer-readable storage medium, and when a processor executes the computer executing instruction, the dimming control method of the light-emitting component is realized.
An embodiment of the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method for controlling dimming of a light emitting device as described above is implemented.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the present embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods described in the embodiments of the present application.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. 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, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. A dimming control method for a light emitting component is characterized by comprising the following steps:
acquiring each frame of picture input into the display device, and determining a target gray value of any pixel in each frame of picture;
for any pixel in each frame of picture, the following steps are executed:
inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage;
according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; the second analog signal parameter is used for turning off the light-emitting component;
inputting a first analog signal parameter or a second analog signal parameter corresponding to each scanning stage to the light-emitting component when the light-emitting component is scanned in each scanning stage according to the target gray value, so that the superposed gray value of the light-emitting component after the scanning stages with the preset number of groups is equal to the target gray value of any pixel; wherein, the second analog signal parameter is used for closing the light emitting component, and comprises:
determining a set gray value combination for realizing the target gray value from the preset group number of set gray values according to the target gray value;
selecting a target scanning stage corresponding to the combination of the target gray values in a plurality of scanning stages in a preset group, and inputting corresponding first analog signal parameters to the light-emitting component, wherein the set gray values corresponding to the corresponding first analog signal parameters are equal to the target gray values after being superposed;
and inputting corresponding second analog signal parameters to the light-emitting component in other scanning stages except the target scanning stage in a plurality of scanning stages in a preset group.
2. The method of claim 1, wherein before determining the target gray-scale value of any pixel in each frame of the image, the method further comprises:
grouping the gray levels of the display device according to the image depth values to obtain the preset group number of set gray values;
and determining a first analog signal parameter corresponding to each set of set gray values, wherein each scanning stage corresponds to one first analog signal parameter.
3. The method of claim 1, wherein the digital signal parameter is a predetermined number of sets of Pulse Width Modulated (PWM) signals, wherein the pulse width of each set of PWM signals is proportional to the predetermined number of sets of gray scale values.
4. The method of claim 1, wherein the digital signal parameter is a predetermined number of sets of Pulse Width Modulated (PWM) signals, wherein the PWM signals of each set have equal pulse widths.
5. The method according to any one of claims 1 to 4, wherein each frame of picture is a color image; the determining the target gray value of any pixel in each frame of picture comprises the following steps:
converting each frame of picture into a gray image;
and processing the gray image by adopting a gray extraction algorithm to obtain a target gray value of any pixel.
6. A light-emitting component dimming control device is characterized by comprising:
the acquisition module is used for acquiring each frame of picture input into the display device and determining a target gray value of any pixel in each frame of picture;
a control module, configured to perform the following steps for any pixel in each frame of the picture: inputting digital signal parameters to a light-emitting component corresponding to any pixel in the display device according to a preset group number so as to scan the light-emitting component in a preset group number of scanning stages; the preset group number is the group number of set gray values obtained by grouping the gray levels of the display device, and each group of set gray values corresponds to a first analog signal parameter for controlling the light-emitting component to realize the corresponding set gray values in the corresponding scanning stage; according to the target gray value, when the light-emitting component is scanned in each scanning stage, inputting a first analog signal parameter or a second analog signal parameter corresponding to the scanning stage into the light-emitting component, so that the superposed gray value of the light-emitting component after passing through the preset group of scanning stages is equal to the target gray value of any pixel; the second analog signal parameter is used for turning off the light-emitting component;
the control module is specifically configured to: determining a set gray value combination for realizing the target gray value from the preset group number of set gray values according to the target gray value;
selecting a target scanning stage corresponding to the combination of the target gray values in a plurality of scanning stages in a preset group, and inputting corresponding first analog signal parameters to the light-emitting component, wherein the set gray values corresponding to the corresponding first analog signal parameters are equal to the target gray values after being superposed;
and inputting corresponding second analog signal parameters to the light-emitting component in other scanning stages except the target scanning stage in a plurality of scanning stages in a preset group.
7. A display device, comprising: the device comprises a controller, a power supply module, a first driving module, a second driving module and a light-emitting component;
the power supply module supplies power to the light-emitting component;
the first driving module is used for inputting a first analog signal parameter or a second analog signal parameter to the light-emitting component;
the second driving module is used for inputting digital signal parameters to the light-emitting component;
the controller is used for controlling the power supply module, the first driving module and the second driving module;
the controller comprises at least one processor and a memory; the memory stores computer-executable instructions; the at least one processor executes computer-executable instructions stored in the memory, so that the at least one processor executes the method for dimming a light emitting component according to any one of claims 1 to 5.
8. The device of claim 7, wherein the light emitting component comprises a control switch tube and a driving switch tube;
the first driving module is connected with a source electrode of the control switch tube, and the second driving module is connected with a grid electrode of the control switch tube;
and the grid electrode of the driving switch tube is connected with the drain electrode of the control switch tube, and the source electrode and the drain electrode of the driving switch tube are respectively connected with the power supply module.
9. A computer-readable storage medium, wherein computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the method for dimming a light-emitting component according to any one of claims 1 to 5 is implemented.
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Patentee after: Chengdu BOE Display Technology Co.,Ltd.

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