CN111754952A - Display control method and device - Google Patents

Display control method and device Download PDF

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Publication number
CN111754952A
CN111754952A CN202010752689.9A CN202010752689A CN111754952A CN 111754952 A CN111754952 A CN 111754952A CN 202010752689 A CN202010752689 A CN 202010752689A CN 111754952 A CN111754952 A CN 111754952A
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gray scale
backlight source
state
sub
value
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CN111754952B (en
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李森旺
苏国火
孙志华
林准
王树明
张银龙
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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BOE Technology Group Co Ltd
Beijing BOE 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
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

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

Abstract

The embodiment of the application discloses a display control method and device. One embodiment of the method comprises: acquiring the state of a backlight source in the display process; and performing gray scale compensation on the sub-pixels of the backlight source which are in an opening state in the corresponding display process. This embodiment can improve the uniformity of the display screen.

Description

Display control method and device
Technical Field
The present application relates to the field of display technology. And more particularly, to a display control method and apparatus.
Background
The existing liquid crystal display mainly loads gray scale voltage and common voltage to a pixel electrode and a common electrode respectively, an electric field formed between the pixel electrode and the common electrode controls liquid crystal molecules to rotate, the liquid crystal molecules modulate transmitted backlight to enable the backlight to irradiate on a color film layer with different light intensities, the color film layer has different light intensity transmissivities to different spectral wave bands, and finally, the required color light is displayed.
However, when a display panel of the liquid crystal display displays a picture, light and shade alternate stripes are easy to appear, so that the picture uniformity is poor, and the static pure-color picture is particularly obvious.
Disclosure of Invention
The present application is directed to a display control method and apparatus, so as to solve at least one of the problems in the prior art.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the application provides a display control method, which is applied to a display device, wherein the display device comprises a display panel, the display panel comprises a plurality of rows of sub-pixels, and the method comprises the following steps:
acquiring the state of a backlight source in the display process;
and performing gray scale compensation on the sub-pixels of the backlight source which are in an opening state in the corresponding display process.
According to the display control method provided by the first aspect of the application, the backlight source state of the display panel in the display process is obtained, and the gray-scale value of the sub-pixel corresponding to the backlight source is adjusted according to the backlight source state, so that the display brightness of the sub-pixel of the display panel in different states corresponding to the backlight source is basically consistent, the situation that a single sub-pixel flickers when the state of the backlight source changes is avoided, and in the situation that one frame of picture is displayed, the brightness of the sub-pixel corresponding to different backlight source states is basically consistent, so that the situation that stripes with alternate brightness and darkness appear in one frame of picture is avoided, the picture uniformity is ensured, and the display effect is improved.
In one possible implementation, performing gray scale compensation on the sub-pixels of the backlight source in the on state in the corresponding display process includes:
and determining the gray scale compensation value of the sub-pixel of the backlight source in the on state in the display process according to the gray scale value of the sub-pixel of the backlight source in the off state in the corresponding display process and the mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing the gray scale compensation according to the gray scale compensation value.
According to the implementation mode, the gray-scale value and the gray-scale compensation value of the sub-pixel corresponding to the backlight source in the starting state can be quickly searched through the mapping relation of the pre-stored gray-scale value and the gray-scale compensation value of the sub-pixel, and then gray-scale compensation is carried out on the sub-pixel corresponding to the backlight source in the starting state in the display process.
In a possible implementation manner, before determining the gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state in the display process and performing the gray scale compensation according to the gray scale compensation value, the display control method further includes:
driving the display panel to display pure color pictures with a plurality of set gray scales, and measuring the brightness value of the sub-pixel corresponding to the backlight source in the on state and the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale;
determining the gray scale value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale and the gamma curve corresponding to the display panel, and determining the gray scale value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale and the gamma curve corresponding to the display panel;
and taking the difference value between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale value of the sub-pixel corresponding to the on-state backlight source as the gray scale compensation value of each set gray scale, and taking the mapping relation between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale compensation value as the mapping relation between the gray scale value of the sub-pixel and the gray scale compensation value and storing the mapping relation.
The implementation mode can accurately acquire the mapping relation between the gray-scale value and the gray-scale compensation value of the sub-pixel, and provides convenience for gray-scale compensation of the sub-pixel in an actual application scene.
In one possible implementation manner, the determining a gray scale compensation value corresponding to a sub-pixel of a backlight source in an on state in a display process according to a gray scale value of the sub-pixel of the backlight source in the off state in the corresponding display process and a mapping relationship between a pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing the gray scale compensation according to the gray scale compensation value includes:
and judging a set gray scale corresponding to the gray scale value of the sub-pixel of the backlight source in the open state in the corresponding display process, and performing gray scale compensation on the sub-pixel of the backlight source in the open state in the display process according to the gray scale compensation value of the set gray scale.
In a possible implementation manner, the acquiring the state of the backlight source in the display process includes:
acquiring a pulse width modulation signal used for controlling the state of the backlight source in the display process;
and determining the state of the backlight source in the display process based on the pulse width modulation signal.
In one possible implementation, the determining the state of the backlight source during the display process based on the pulse width modulation signal includes:
when the pulse width modulation signal is a high level signal, determining that the backlight source is in an open state; and when the pulse width modulation signal is a low level signal, determining that the backlight source is in a closed state.
In one possible implementation manner, the acquiring the state of the backlight source in the display process includes:
detecting the brightness of a backlight source in the display process;
when the brightness of the backlight source is larger than a preset threshold value, determining that the backlight source is in an opening state;
and when the brightness of the backlight source is smaller than or equal to a preset threshold value, determining that the backlight source is in a closed state.
The second aspect of the present application provides a display control device, which is applied to a display device, the display device includes a display panel, the display panel includes a plurality of rows of sub-pixels, the display control device includes a timing controller, the timing controller is configured to obtain a state of a backlight source in a display process, and perform gray scale compensation on the sub-pixels of the backlight source in an on state in a corresponding display process.
In one possible implementation manner, the acquiring, by the timing controller, a state of the backlight in the display process includes:
acquiring a pulse width modulation signal used for controlling the state of the backlight source in the display process;
and determining the state of the backlight source in the display process based on the pulse width modulation signal.
In one possible implementation, the determining, by the timing controller, a state of the backlight source during the displaying based on the pulse width modulation signal includes:
when the pulse width modulation signal is a high level signal, determining that the backlight source is in an open state;
and when the pulse width modulation signal is a low level signal, determining that the backlight source is in a closed state.
In one possible implementation manner, the display control device further includes a memory storing a mapping relationship between a gray-scale value of the sub-pixel and a gray-scale compensation value, and the performing gray-scale compensation on the sub-pixel corresponding to the backlight source in the on state by the timing controller includes: and determining the gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state in the display process according to the gray scale value of the sub-pixel of the backlight source in the off state in the corresponding display process and the mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing gray scale compensation according to the gray scale compensation value.
The beneficial effect of this application is as follows:
according to the technical scheme, the backlight source state of the display panel in the display process is obtained, the gray-scale value of the sub-pixel corresponding to the backlight source is adjusted according to the state of the backlight source, the display brightness of the sub-pixel of the display panel in different states corresponding to the backlight source is basically consistent, the situation that a single sub-pixel flickers when the state of the backlight source changes is avoided, the brightness of the sub-pixel corresponding to different backlight source states is basically consistent under the situation that a frame of picture is displayed, the situation that stripes with alternate bright and dark appear under the frame of picture is avoided, the picture uniformity is guaranteed, and the display effect is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram illustrating a corresponding relationship between a backlight state and a bright-dark state of a sub-pixel in a frame time in the prior art.
Fig. 2 is a flowchart illustrating a display control method according to an embodiment of the present application.
Fig. 3 is a schematic diagram illustrating a corresponding relationship between a backlight source state, a sub-pixel gray scale compensation, and a bright and dark state of a sub-pixel in one frame time according to an embodiment of the present disclosure.
Fig. 4 shows a schematic structural diagram of a display control device provided by an embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. The example embodiments, however, are intended to be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art.
Since LED (Light-emitting Diode) Light sources have advantages of low power consumption, long service life, high brightness, and the like compared to CCFL (Cold Cathode Fluorescent Lamp) Light sources, more and more liquid crystal display devices (especially large-sized liquid crystal display devices) start to use LED Light sources as their backlight sources. Meanwhile, in order to further improve the contrast of the liquid crystal display picture and improve the picture display quality, when the LED light source is used as the backlight source of the liquid crystal display device, the LED light source can be adjusted by using a backlight adjustment technology.
Currently, commonly used LED backlight adjustment techniques include: LED analog dimming techniques and PWM (pulse width modulation) dimming techniques. When the LED light source is adjusted by using the LED analog dimming technology, the LED light source is usually directly adjusted by changing the current flowing through the LED, which may seriously affect the light emitting quality of the LED, and the analog dimming technology may increase the energy consumption of the whole system, so the pwm dimming technology is mostly used in the LED backlight driving of the liquid crystal display device.
The PWM dimming technique is a dimming technique that repeatedly switches an LED Driver (LED Driver) using a simple pulse signal, and controls the on/off of a backlight LED by adjusting a frequency and a duty ratio, wherein the modulation frequency is an integer multiple of a frame frequency of a display panel, and the display panel can adopt a progressive scanning mode.
Because the display panel adopts a progressive scanning mode, in the time when the display panel displays a frame of picture, a part of sub-pixels on the display panel are scanned when the backlight source is in an on state, and the other part of the sub-pixels are scanned when the backlight source is in an off state.
In one specific example, as shown in fig. 1, the backlight source changes 3 periods during the time that the display panel displays one frame of picture, the display panel scans 2160 rows of sub-pixels, and the 2160 rows of sub-pixels can be divided into 6 pixel display areas according to the backlight period, that is: each pixel display area comprises 360 rows of sub-pixels which respectively correspond to the periodic on-off of the backlight source.
It should be noted that, when the backlight is in an off state (corresponding to the off state in fig. 1), the active layer (made of a semiconductor material) in the corresponding pixel circuit can be understood as an insulating layer, and in this case, the step constant can be 1; when the backlight is in an on state (corresponding to bright in fig. 1), an active layer (the active layer is made of a semiconductor material) in a corresponding pixel circuit becomes a conductor under the influence of illumination, at this time, a step electrical constant may be 2, where 2 is greater than 1, and a calculation formula C based on capacitance is S/d, it can be known that when a distance d between the active layer and the gate and a facing area S are not changed, the larger the step electrical constant is, the larger a capacitance C generated between the active layer and the gate is, and the larger the capacitance C is, the more serious the delay condition is, so that the pixel charging rate is reduced, and the luminance of the corresponding pixel is low, so that bright and dark stripes may occur due to different charging rates within a time period in which the display panel displays a frame, the uniformity is not good, and the static pure color image is particularly obvious.
In order to solve the above problems, there is a scheme in the prior art, which is based on increasing the modulation frequency of the backlight source to make the stripes become thin, and when the frequency of the backlight source is increased to 15KHZ, human eyes cannot distinguish the stripes, but the service life of the LED is greatly reduced due to too large frequency, and the scheme cannot fundamentally solve the above problems.
Therefore, the inventor proposes the present application, and an embodiment of the present application provides a display control method applied to a display device, the display device including a display panel, the display panel including a plurality of rows of sub-pixels, as shown in fig. 2, the display control method including the steps of:
s10, obtaining the mapping relation between the gray scale value and the gray scale compensation value of the sub-pixel.
In some embodiments, step S10 includes the following sub-steps:
driving the display panel to display pure color pictures with a plurality of set gray scales, and measuring the brightness value of the sub-pixel corresponding to the backlight source in the on state and the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale;
determining the gray scale value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale and the gamma curve corresponding to the display panel, and determining the gray scale value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale and the gamma curve corresponding to the display panel;
and taking the difference value between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale value of the sub-pixel corresponding to the on-state backlight source as the gray scale compensation value of each set gray scale, and taking the mapping relation between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale compensation value as the mapping relation between the gray scale value of the sub-pixel and the gray scale compensation value and storing the mapping relation.
It should be understood by those skilled in the art that any one of the set gray levels corresponds to the luminance values of one of the sub-pixels of the backlight in the on state and the luminance values of one of the sub-pixels of the backlight in the on state. For example, a pure color picture with a gray level of 32 is set to correspond to the brightness value L of the sub-pixel of the backlight source in an on state32,1Corresponding to the luminance value L of a sub-pixel of a backlight source in an OFF state32,2(ii) a Setting a pure color picture with a gray scale of 64 corresponding to the brightness value L of a sub-pixel of a backlight source in an on state64,1Corresponding to the luminance value L of a sub-pixel of a backlight source in an OFF state64,2Wherein L is32,1、L32,2、L64,1And L64,2Are all not equal.
In one embodiment, the gray scale G is set at a first level1Driving a display panel to display a first test picture, wherein the first test picture is a pure color picture, and measuring the brightness value L of a sub-pixel of the first test picture when a backlight source is in an open stateG,1Measuring the brightness value L of the sub-pixel of the first test picture when the backlight source is in the off stateG,2；
According to the brightness value LG,1Determining the gray scale value g of the sub-pixel under the first test picture when the backlight source is in the open state according to the gamma curve corresponding to the display panelG,1According to the brightness value LG,2Determining a gamma curve corresponding to the display panel when the backlight source is in a closed state under the first test pictureGray scale value g of the sub-pixelG,2；
The first set gray level G can be determined1Lower gray scale compensation value delta gG＝gG,2-gG,1(ii) a I.e. the first set gray level G1The gray scale value to be compensated for at the sub-pixel of the backlight in the on state should be Δ gG＝gG,2-gG,1The actual gray scale value at a sub-pixel of the backlight in the on state should be gG,1+ΔgG(i.e., the actual gray scale value of the sub-pixel in the backlight in the on state should be equal to gG,2) Therefore, the display brightness of the sub-pixels is basically consistent when the corresponding backlight source is in an on state and when the corresponding backlight source is in an off state, the situation that the single sub-pixel flickers when the state of the backlight source is changed can be avoided, and in addition, the first set gray scale G1When a frame of picture is displayed, the brightness of the sub-pixels of the backlight sources in different states is basically consistent, so that the condition that stripes with alternate brightness and darkness appear in the frame of picture can be avoided, the uniformity of the picture can be ensured, and the display effect is improved.
It should be noted that, the pure color pictures with multiple set gray levels provided in this embodiment may be all red pictures, all green pictures, all blue pictures, and all white pictures.
It is easily understood by those skilled in the art that the gray scale value ranges from 0 gray scale to 255 gray scale, and the plurality of set gray scales described herein include 1 gray scale to 255 gray scale, and since the sub-pixel does not display or displays black at 0 gray scale, it is not necessary to compensate for this, and the plurality of set gray scales can be set to 32 levels, 64 levels, etc. according to the display parameters of the display panel.
By the method, gray scale values corresponding to the sub-pixels of the backlight source in the on state and corresponding to the sub-pixels of the backlight source in the off state, which correspond to the set gray scales from 1 gray scale to 255 gray scale, are obtained, gray scale compensation values corresponding to the set gray scales from 1 gray scale to 255 gray scale are obtained, and a data lookup table shown in table 1 is generated according to the mapping relationship between the gray scale compensation values and the gray scale values corresponding to the sub-pixels of the backlight source in the off state, wherein the data lookup table shows the gray scale values corresponding to the sub-pixels of the backlight source in the off state and the gray scale values to be compensated for the sub-pixels of the backlight source in the on state under the set gray scales from 1 gray scale to 255 gray scale.
It should be noted that the form of the mapping relationship between the gray scale value of the sub-pixel and the gray scale compensation value is not limited to the table form shown in table 1.
TABLE 1
Figure BDA0002610545240000071
And S20, acquiring the state of the backlight source in the display process.
It should be understood that the backlight of the present embodiment may be an LED backlight.
The foregoing mentions that the state of the backlight can be adjusted by PWM dimming technique, and therefore, in some embodiments, to obtain the state of the backlight during the display process, the step S20 includes the following sub-steps:
s202, acquiring a pulse width modulation signal (namely a PWM signal) for controlling the state of the backlight source in the display process;
s204, determining the state of a backlight source in the display process based on the pulse width modulation signal;
for example, when the pwm signal is a high level signal, it may be determined that the backlight is in an on state; when the pulse width modulation signal is a low level signal, the backlight source can be determined to be in the off state. But not limited thereto, it can also be determined that the backlight source is in the on state when the pwm signal is a low level signal; when the pwm signal is a high level signal, the backlight source can be determined to be in an off state, as the case may be.
In addition to the above-mentioned determination of the state of the backlight source during the display process according to the acquired pulse width modulation signal, in some embodiments, the state of the backlight source during the display process can be determined by directly detecting the brightness of the backlight source, and then the step S20 can further include the following sub-steps:
step S212, detecting the brightness of the backlight source in the display process;
step S214, when the brightness of the backlight source is larger than a preset threshold value, determining that the backlight source is in an opening state;
and S216, when the brightness of the backlight source is smaller than or equal to a preset threshold value, determining that the backlight source is in a closed state.
It should be noted that this preset threshold value may be set by a specific case.
And S30, performing gray scale compensation on the sub-pixels of the backlight source in the corresponding display process in the starting state.
Since the active layer (made of semiconductor material) in the corresponding pixel circuit of the backlight source can be changed into a conductor under the influence of illumination when the backlight source is in an on state, the brightness of the corresponding pixel is low, and the brightness value of the sub-pixel can be changed by adjusting the gray-scale value of the sub-pixel through the timing controller, the gray-scale value of the sub-pixel of the backlight source in the on state can be compensated in order to increase the brightness value of the sub-pixel of the backlight source in the on state during the display process. Thus, in some embodiments, step S30 includes the following sub-steps
S302, determining a gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state in the display process according to the gray scale value corresponding to the sub-pixel of the backlight source in the off state in the display process and a mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing gray scale compensation according to the gray scale compensation value.
In some embodiments, step S302 further includes the following sub-steps:
s3022, judging a set gray scale corresponding to the gray scale value of the sub-pixel of the backlight source in the on state in the display process, and performing gray scale compensation on the sub-pixel of the backlight source in the on state in the display process according to the gray scale compensation value of the set gray scale.
For convenience of understanding, the present embodiment is described with reference to the foregoing examples, and the corresponding display process is determinedGray scale value g of sub-pixel of backlight source in on stateG,1The corresponding set gray scale G obtains the gray scale compensation value delta G under the set gray scale G through the pre-stored mapping relationGBased on the gray-scale compensation value Δ gGThe gray scale compensation is carried out on the sub-pixel of the backlight source in the starting state in the display process, and the actual gray scale value of the compensated sub-pixel of the backlight source in the starting state is gG,1+ΔgG。
The display control method provided by the application comprises a factory test stage and an actual application stage, wherein the factory test stage corresponds to the step S10 part of the display control method, and the actual application stage corresponds to the steps S20 and S30 part of the display control method.
According to the display control method, through acquiring the state of the backlight source in the display process, gray scale compensation is carried out on the sub-pixels of the backlight source in the starting state in the corresponding display process, so that the gray scale values of the sub-pixels in the starting state of the backlight source can be increased, the display brightness of the sub-pixels is basically consistent when the sub-pixels correspond to different states of the backlight source, the situation that the single sub-pixel flickers when the state of the backlight source changes can be avoided, in addition, under the situation that one frame of picture is displayed, the brightness of the sub-pixels corresponding to different backlight source states can be basically consistent, the situation that stripes with alternate bright and dark appear in one frame of picture can be avoided, the uniformity of the picture can be ensured, and the display effect is improved.
For example, as shown in fig. 3, during one frame time of the display panel, the duty ratio of the backlight source is 1:1, the backlight source occurs 3 periods, the display panel scans 2160 lines (without considering Blanking area Blanking), and the 2160 lines of sub-pixels are divided into 6 pixel display areas according to the backlight period, that is, each display area includes 360 lines of sub-pixels, which respectively correspond to the backlight source being turned on and off periodically.
Gray scale compensation is performed on the sub-pixels of the backlight source which are in an on state (corresponding to bright in fig. 3) in the corresponding display process, so that the brightness of the sub-pixels of the backlight source which are in the on state (corresponding to bright in fig. 3) in the corresponding display process is consistent with the brightness of the sub-pixels of the backlight source which are in an off state (corresponding to off in fig. 3) in the corresponding display process, the condition of stripes between bright and dark is avoided in one picture, the condition of picture fault is improved, the picture uniformity is ensured, and the display effect is improved.
It should be noted that, for convenience of understanding and description, this example only shows the case where the duty ratio of the backlight is 1:1, and those skilled in the art can easily understand that, when the duty ratio of the backlight is not 1:1, the number of sub-pixel rows of the backlight in different states changes accordingly. For example, when the duty ratio of the backlight source is 4:1, in one backlight period, the sub-pixel rows of the backlight source corresponding to the on state (corresponding to bright in fig. 3) during the display process are changed to 1-576 rows, and the sub-pixel rows of the backlight source corresponding to the off state (corresponding to off in fig. 3) during the display process are changed to 577-720 rows.
It should be noted that the periodic change of the backlight source during the time when the display panel displays one frame of picture is not limited to 3 periods. For example, within the period of displaying one frame of picture by the display panel, the backlight source changes for 6 periods, the display panel scans 2160 rows of sub-pixels, and according to the backlight period, the 2160 rows of sub-pixels can be divided into 12 pixel display areas, each of which includes 180 rows of sub-pixels, and each of the pixel display areas corresponds to the periodic on/off of the backlight source.
Another embodiment of the present application provides a display control apparatus, which is applied to a display apparatus including a display panel, the display panel including a plurality of rows of sub-pixels, as shown in fig. 4, the display control apparatus includes a timing controller, the timing controller is configured to obtain a state of a backlight source during a display process, and perform gray scale compensation on the sub-pixels of the backlight source corresponding to the backlight source in an on state during the display process.
The display control device further comprises a memory for storing a mapping relation between gray-scale values of the sub-pixels and gray-scale compensation values, and the time schedule controller is used for performing gray-scale compensation on the sub-pixels corresponding to the backlight source in the on state and comprises the following steps: and determining the gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state in the display process according to the gray scale value of the sub-pixel of the backlight source in the on state in the corresponding display process and the mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing the gray scale compensation according to the gray scale compensation value.
In a specific example, a liquid crystal display panel is taken as an example, and the liquid crystal display panel may include a data decoding circuit, a timing controller, a gate driving circuit, a data driving circuit, a storage device (e.g., a flash memory, etc.), and the like in addition to a pixel array. The data decoding circuit receives and decodes a display input signal from a signal source (such as a set top box, the Internet, an external storage device and the like) to obtain a display data signal; the timing controller is connected with a scan driving circuit (gate driving circuit) and a data driving circuit through a scan control link. It should be understood that the conventional timing controller is only used to generate timing signals (or sync signals) and has no processing function on video signals, but with the development of display control technology, the currently used timing controller has integrated image processing function so that the timing controller can process video signals, and then, the timing controller outputs timing signals to control the gate driving circuit, the data driving circuit, etc. to work synchronously, and can perform Gamma (Gamma) correction on display data signals, and input the processed display data signals to the data driving circuit to perform display operation. For example, before performing gamma correction on the display data signal, the timing controller may further perform gray scale compensation processing on the display data signal, for example, reading a pre-stored gray scale compensation parameter from the storage device, further processing the display data signal by using the gray scale compensation parameter to obtain a gray scale compensated display data signal, and after completing the gray scale compensation processing and the gamma correction, outputting the display data signal to the data driving circuit for display operation. Alternatively, the display panel may include an independent gamma circuit that performs gamma correction and gray scale compensation processing on the display data signal under the control of the timing controller.
For example, in at least one example, to obtain the pixel compensation parameters, the timing controller is configured to process to obtain a measured gray scale response curve of each pixel, and then perform curve fitting on the compensated gray scale and the input gray scale by using a method of adjusting the gray scale according to an ideal gray scale response curve, for example, using a polynomial, to finally obtain a polynomial coefficient for compensation, and write the polynomial coefficient for compensation into the storage device of the display panel under the control of the timing controller.
And then, when the liquid crystal display panel is used as a product to carry out normal display operation, the time sequence controller in the display surface reads the pre-stored polynomial coefficients for gray scale compensation from the storage device, and the corrected gray scales of the gray scales of each pixel are obtained through processing, so that the gray scale accuracy of each pixel is compensated in real time, the uniformity of brightness is realized, and the integral display uniformity of the liquid crystal display panel is finally improved.
It should be noted that the principle and the working flow of the display control apparatus provided in this embodiment are similar to those of the display control method, and reference may be made to the above description for relevant parts, which are not described herein again.
Another embodiment of the present application provides a display apparatus including the above display control apparatus. The display device may be any product or component having a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is further noted that, in the description of the present application, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned examples are given for the purpose of illustrating the present application clearly and not for the purpose of limiting the same, and that various other modifications and variations of the present invention may be made by those skilled in the art in light of the above teachings, and it is not intended to be exhaustive or to limit the invention to the precise form disclosed.

Claims (11)

1. A display control method applied to a display device, the display device comprising a display panel including a plurality of rows of sub-pixels, the method comprising:
acquiring the state of a backlight source in the display process;
and performing gray scale compensation on the sub-pixels of the backlight source which are in an opening state in the corresponding display process.
2. The method according to claim 1, wherein the performing gray scale compensation on the sub-pixels corresponding to the backlight source in an on state during the display process comprises:
and determining the gray scale compensation value of the sub-pixel corresponding to the backlight source in the on state in the display process according to the gray scale value of the sub-pixel corresponding to the backlight source in the off state in the display process and the mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing gray scale compensation according to the gray scale compensation value.
3. The method according to claim 2, wherein before determining the gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state during the display process and performing the gray scale compensation according to the gray scale compensation value, the method further comprises:
driving the display panel to display pure color pictures with a plurality of set gray scales, and measuring the brightness value of the sub-pixel corresponding to the backlight source in the on state and the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale;
determining the gray scale value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the on state under each set gray scale and the gamma curve corresponding to the display panel, and determining the gray scale value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale according to the brightness value of the sub-pixel corresponding to the backlight source in the off state under each set gray scale and the gamma curve corresponding to the display panel;
and taking the difference value between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale value of the sub-pixel corresponding to the on-state backlight source as the gray scale compensation value of each set gray scale, and taking the mapping relation between the gray scale value of the sub-pixel corresponding to the off-state backlight source under each set gray scale and the gray scale compensation value as the mapping relation between the gray scale value of the sub-pixel and the gray scale compensation value and storing the mapping relation.
4. The method according to claim 3, wherein the determining the gray scale compensation value corresponding to the sub-pixel of the backlight source in the on state during the display process according to the gray scale value corresponding to the sub-pixel of the backlight source in the off state during the display process and the pre-stored mapping relationship between the gray scale value of the sub-pixel and the gray scale compensation value and performing the gray scale compensation according to the gray scale compensation value comprises:
and judging a set gray scale corresponding to the gray scale value of the sub-pixel of the backlight source in the closed state in the corresponding display process, and performing gray scale compensation on the sub-pixel of the backlight source in the open state in the corresponding display process according to the gray scale compensation value of the set gray scale.
5. The method according to claim 1, wherein the acquiring the state of the backlight in the display process includes:
acquiring a pulse width modulation signal used for controlling the state of the backlight source in the display process;
and determining the state of the backlight source in the display process based on the pulse width modulation signal.
6. The method according to claim 5, wherein the determining the state of the backlight source during the display based on the pulse width modulation signal comprises:
when the pulse width modulation signal is a high level signal, determining that the backlight source is in an open state;
and when the pulse width modulation signal is a low level signal, determining that the backlight source is in a closed state.
7. The method according to claim 1, wherein the acquiring the state of the backlight in the display process includes:
detecting the brightness of a backlight source in the display process;
when the brightness of the backlight source is larger than a preset threshold value, determining that the backlight source is in an opening state;
and when the brightness of the backlight source is smaller than or equal to a preset threshold value, determining that the backlight source is in a closed state.
8. The display control device is characterized in that the time schedule controller is used for acquiring the state of a backlight source in the display process and carrying out gray scale compensation on the sub-pixels of the backlight source which are in an opening state in the corresponding display process.
9. The display control device of claim 8, further comprising a memory storing a mapping relationship between gray-scale values of the sub-pixels and gray-scale compensation values, wherein the timing controller for performing gray-scale compensation on the sub-pixels corresponding to the backlight source in the on state comprises: and determining the gray scale compensation value of the sub-pixel corresponding to the backlight source in the on state in the display process according to the gray scale value of the sub-pixel corresponding to the backlight source in the off state in the display process and the mapping relation between the pre-stored gray scale value of the sub-pixel and the gray scale compensation value, and performing gray scale compensation according to the gray scale compensation value.
10. The display control device according to claim 8, wherein the timing controller is configured to acquire a state of the backlight during display, and includes:
acquiring a pulse width modulation signal used for controlling the state of the backlight source in the display process;
and determining the state of the backlight source in the display process based on the pulse width modulation signal.
11. The display control device according to claim 10, wherein the timing controller for determining the state of the backlight source during display based on the pulse width modulation signal comprises:
when the pulse width modulation signal is a high level signal, determining that the backlight source is in an open state;
and when the pulse width modulation signal is a low level signal, determining that the backlight source is in a closed state.
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