CN110010065B - Display panel brightness adjusting method and display panel brightness adjusting system - Google Patents

Display panel brightness adjusting method and display panel brightness adjusting system Download PDF

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CN110010065B
CN110010065B CN201910364411.1A CN201910364411A CN110010065B CN 110010065 B CN110010065 B CN 110010065B CN 201910364411 A CN201910364411 A CN 201910364411A CN 110010065 B CN110010065 B CN 110010065B
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display area
value
brightness
display panel
display
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CN110010065A (en
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陈小龙
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Shenzhen China Star Optoelectronics Semiconductor 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • 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
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0613—The adjustment depending on the type of the information to be displayed
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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Abstract

The invention provides a display panel brightness adjusting method and a display panel brightness adjusting system. The display panel brightness adjusting method drives the display panel through the theoretical gray-scale value of each display area to obtain the actual brightness value of each display area, when the actual brightness value of each display area does not reach the preset brightness uniformity requirement, the compensation gray-scale value of each display area is obtained through the difference value of the expected brightness value and the actual brightness value of each display area to drive the display panel to obtain the latest actual brightness value of each display area, if the latest actual brightness value of each display area has not yet reached the preset brightness uniformity requirement, and repeatedly obtaining a compensation gray-scale value through the difference value between the expected brightness value and the latest actual brightness value to drive the display panel to obtain the latest actual brightness value of each display area until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, thereby quickly adjusting the brightness uniformity of the display panel.

Description

Display panel brightness adjusting method and display panel brightness adjusting system
Technical Field
The invention relates to the technical field of display, in particular to a display panel brightness adjusting method and a display panel brightness adjusting system.
Background
Thin Film Transistors (TFTs) are the main driving elements in current Liquid Crystal Displays (LCDs) and Active Matrix Organic electroluminescent displays (AMOLEDs), and are directly related to the Display performance of flat panel displays.
Most of the existing liquid crystal displays in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel operates on the principle that liquid crystal molecules are poured between a Thin Film Transistor Array Substrate (TFT Array Substrate) and a Color Filter (CF) Substrate, pixel voltage and common voltage are applied to the two substrates, and the rotation direction of the liquid crystal molecules is controlled by an electric field formed between the pixel voltage and the common voltage, so that light of a backlight module is transmitted out to generate a picture.
OLED devices typically include: the light-emitting diode comprises a substrate, an anode arranged on the substrate, a hole injection layer arranged on the anode, a hole transport layer arranged on the hole injection layer, a light-emitting material layer arranged on the hole transport layer, an electron transport layer arranged on the light-emitting material layer, an electron injection layer arranged on the electron transport layer and a cathode arranged on the electron injection layer. The light emitting principle of the OLED device is that a semiconductor material and an organic light emitting material emit light under the drive of an electric field through carrier injection and recombination. Specifically, an Indium Tin Oxide (ITO) electrode and a metal electrode are generally used as an anode and a cathode of the device, respectively, and under a certain voltage, electrons and holes are injected into an electron transport layer and a hole transport layer from the cathode and the anode, respectively, and the electrons and the holes migrate to a light emitting material layer through the electron transport layer and the hole transport layer, respectively, and meet in the light emitting material layer to form excitons and excite light emitting molecules, which emit visible light through radiative relaxation.
At present, there is a certain requirement for the display brightness uniformity of the display panel, for example, the display brightness of each region of the OLED display panel is affected by the light Emitting (EL) material, the backplane uniformity, the TFT aging, and the threshold voltage (Vth) shift of the driving TFT.
Disclosure of Invention
The invention aims to provide a display panel brightness adjusting method which can quickly and accurately adjust the brightness uniformity of a display panel and can quickly and accurately adjust the brightness uniformity of the display panel.
The invention also aims to provide a brightness adjusting system of a display panel, which can quickly and accurately adjust the brightness uniformity of the display panel.
In order to achieve the above object, the present invention provides a method for adjusting brightness of a display panel, comprising the following steps:
step S1, dividing the display panel into M × N display areas, setting M and N as positive integers, and obtaining a theoretical gray level value of each display area according to a preset gamma curve and an expected brightness value of each display area;
step S2, driving the display panel according to the theoretical gray scale value of each display area to obtain the actual brightness value of each display area;
step S3, determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement; when the actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting a theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the step S4 is carried out;
step S4, determining the difference value between the expected brightness value and the actual brightness value of each display area, and obtaining the compensation gray scale value of each display area according to the compensation gray scale formula;
step S5, driving the display panel according to the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area;
step S6, determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement; and when the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting the compensation gray-scale value corresponding to the latest actual brightness value of each display area, otherwise, the steps S4-S6 are repeated until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement.
The calculation formula of the theoretical gray scale value in step S1 is:
Figure BDA0002047755490000021
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient.
The calculation formula of the theoretical gray-scale value is represented by the formula:
Figure BDA0002047755490000031
and (4) converting to obtain.
The compensation gray scale formula in step S4 is:
Figure BDA0002047755490000032
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
ΔL＝Li-LjWherein L isjActual brightness values for each display area.
The present invention also provides a system for adjusting brightness of a display panel, comprising: the display device comprises a display panel and a brightness adjusting module connected with the display panel;
the brightness adjusting module is used for dividing the display panel into M-N display areas, setting M and N to be positive integers, and obtaining a theoretical gray level value of each display area according to a preset gamma curve and an expected brightness value of each display area;
driving the display panel according to the theoretical gray-scale value of each display area to obtain the actual brightness value of each display area;
determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the actual brightness value of each display area meets the preset brightness uniformity requirement, the display panel displays by adopting a theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the difference value between the expected brightness value and the actual brightness value of each display area is determined, and the compensation gray scale value of each display area is obtained according to a compensation gray scale formula;
driving the display panel according to the compensation gray-scale value of each display area to obtain the latest actual brightness value of each display area;
determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting the compensation gray scale value corresponding to the latest actual brightness value of each display area, otherwise, the difference value between the expected brightness value and the latest actual brightness value of each display area is repeatedly determined, the compensation gray scale value of each display area is obtained according to the compensation gray scale formula, the display panel is driven according to the compensation gray scale value of each display area, and the latest actual brightness value of each display area is obtained until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement.
The calculation formula of the theoretical gray scale value is as follows:
Figure BDA0002047755490000041
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient.
The calculation formula of the theoretical gray-scale value is represented by the formula:
Figure BDA0002047755490000042
and (4) converting to obtain.
The compensation gray scale formula is as follows:
Figure BDA0002047755490000043
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
ΔL＝Li-LjWherein L isjActual brightness values for each display area.
The invention has the beneficial effects that: the display panel brightness adjusting method of the invention drives the display panel through the theoretical gray scale value of each display area to obtain the actual brightness value of each display area, when the actual brightness value of each display area does not reach the preset brightness uniformity requirement, the compensation gray scale value of each display area is obtained through the difference value of the expected brightness value and the actual brightness value of each display area, then the display panel is driven according to the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area, if the latest actual brightness value of each display area does not reach the preset brightness uniformity requirement, the compensation gray scale value of each display area is obtained through the difference value of the expected brightness value and the latest actual brightness value of each display area repeatedly, so as to drive the display panel to obtain the latest actual brightness value of each display area, and (4) until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, thereby quickly and accurately adjusting the brightness uniformity of the display panel. The brightness adjusting system of the display panel can quickly and accurately adjust the brightness uniformity of the display panel.
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For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a flow chart of a method for adjusting brightness of a display panel according to the present invention;
FIG. 2 is a logic diagram of a method for adjusting brightness of a display panel according to the present invention;
FIG. 3 is a diagram of a system for adjusting brightness of a display panel according to the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1 and fig. 2, the present invention provides a method for adjusting brightness of a display panel, comprising the following steps:
step S1, dividing the display panel into M × N display areas, setting M and N as positive integers, and obtaining a theoretical gray level value of each display area according to a preset gamma curve and an expected brightness value of each display area;
step S2, driving the display panel according to the theoretical gray scale value of each display area to obtain the actual brightness value of each display area;
step S3, determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement; when the actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting a theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the step S4 is carried out;
step S4, determining the difference value between the expected brightness value and the actual brightness value of each display area, and obtaining the compensation gray scale value of each display area according to the compensation gray scale formula;
step S5, driving the display panel according to the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area;
step S6, determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement; and when the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting the compensation gray-scale value corresponding to the latest actual brightness value of each display area, otherwise, the steps S4-S6 are repeated until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement.
It should be noted that, the present invention first drives the display panel through the theoretical gray scale value of each display area to obtain the actual brightness value of each display area, when the actual brightness value of each display area does not meet the requirement of the preset brightness uniformity, obtains the compensation gray scale value of each display area through the difference between the expected brightness value and the actual brightness value of each display area, further drives the display panel according to the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area, and when the latest actual brightness value of each display area does not meet the requirement of the preset brightness uniformity, obtains the compensation gray scale value of each display area through the difference between the expected brightness value and the latest actual brightness value of each display area again to drive the display panel to obtain the latest actual brightness value of each display area until the latest actual brightness value of each display area meets the requirement of the preset brightness uniformity, therefore, the brightness uniformity of the display panel can be adjusted quickly and accurately. Further, the larger the number of display area divisions, the more accurate the luminance uniformity judgment of the display panel.
Specifically, the calculation formula of the theoretical gray scale value in step S1 is as follows:
Figure BDA0002047755490000061
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient.
Further, the calculation formula of the theoretical gray-scale value is represented by the formula:
Figure BDA0002047755490000062
and (4) converting to obtain.
Specifically, the compensation gray scale formula in step S4 is:
Figure BDA0002047755490000063
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
Further, Δ L ═ Li-LjWherein L isjActual brightness values for each display area. When the expected brightness value is larger than the actual brightness value, the difference value is a positive value, otherwise, the difference value is a negative value, so that the actual brightness of the display panel is compensated, and the actual brightness of the display panel tends to the uniformity requirement.
Referring to fig. 3, based on the above method for adjusting the brightness of the display panel, the present invention further provides a system for adjusting the brightness of the display panel, including: a display panel 10 and a brightness adjusting module 20 connected to the display panel 10;
the brightness adjusting module 20 is configured to divide the display panel 10 into M × N display regions, where M and N are both positive integers;
obtaining a theoretical gray-scale value of each display area according to a preset gamma curve and an expected brightness value of each display area;
driving the display panel 10 according to the theoretical gray scale value of each display area to obtain an actual brightness value of each display area;
determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the actual brightness value of each display area meets the preset brightness uniformity requirement, the display panel 10 displays by using the theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the difference value between the expected brightness value and the actual brightness value of each display area is determined, and the compensation gray scale value of each display area is obtained according to the compensation gray scale formula;
driving the display panel 10 according to the compensated gray scale value of each display area to obtain the latest actual brightness value of each display area;
determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel 10 displays by using the compensation gray scale value corresponding to the latest actual brightness value of each display area, otherwise, the difference between the expected brightness value and the latest actual brightness value of each display area is repeatedly determined, the compensation gray scale value of each display area is obtained according to the compensation gray scale formula, the display panel 10 is driven according to the compensation gray scale value of each display area, and the latest actual brightness value of each display area is obtained until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement.
It should be noted that, the present invention firstly drives the display panel 10 by the theoretical gray-scale value of each display region to obtain the actual brightness value of each display region, when the actual brightness value of each display region does not meet the requirement of the preset brightness uniformity, the compensation gray-scale value of each display region is obtained by the difference between the expected brightness value and the actual brightness value of each display region, and then drives the display panel 10 by the compensation gray-scale value of each display region to obtain the latest actual brightness value of each display region, and when the latest actual brightness value of each display region does not meet the requirement of the preset brightness uniformity, the compensation gray-scale value of each display region is obtained by the difference between the expected brightness value and the latest actual brightness value of each display region again to drive the display panel 10 to obtain the latest actual brightness value of each display region, and (4) until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, thereby quickly and accurately adjusting the brightness uniformity of the display panel. Further, the larger the number of display area divisions, the more accurate the luminance uniformity judgment of the display panel.
Specifically, the calculation formula of the theoretical gray scale value is as follows:
Figure BDA0002047755490000081
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient.
Further, the calculation formula of the theoretical gray-scale value is represented by the formula:
Figure BDA0002047755490000082
and (4) converting to obtain.
Specifically, the compensation gray scale formula is as follows:
Figure BDA0002047755490000083
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
Further, Δ L ═ Li-LjWherein L isjActual brightness values for each display area. When the expected brightness value is larger than the actual brightness value, the difference value is a positive value, otherwise, the difference value is a negative value, so that the actual brightness of the display panel is compensated, and the actual brightness of the display panel tends to the uniformity requirement.
To sum up, the method for adjusting brightness of a display panel according to the present invention drives the display panel by the theoretical gray scale value of each display area to obtain the actual brightness value of each display area, obtains the compensation gray scale value of each display area by the difference between the expected brightness value and the actual brightness value of each display area when the actual brightness value of each display area does not meet the requirement of the preset brightness uniformity, drives the display panel by the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area, obtains the compensation gray scale value of each display area by the difference between the expected brightness value and the latest actual brightness value of each display area again when the latest actual brightness value of each display area does not meet the requirement of the preset brightness uniformity, and drives the display panel to obtain the latest actual brightness value of each display area, and (4) until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, thereby quickly and accurately adjusting the brightness uniformity of the display panel. The brightness adjusting system of the display panel can quickly and accurately adjust the brightness uniformity of the display panel.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.

Claims (6)

1. A method for adjusting the brightness of a display panel is characterized by comprising the following steps:
step S1, dividing the display panel into M × N display areas, setting M and N as positive integers, and obtaining a theoretical gray level value of each display area according to a preset gamma curve and an expected brightness value of each display area;
step S2, driving the display panel according to the theoretical gray scale value of each display area to obtain the actual brightness value of each display area;
step S3, determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement; when the actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel displays by adopting a theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the step S4 is carried out;
step S4, determining the difference value between the expected brightness value and the actual brightness value of each display area, and obtaining the compensation gray scale value of each display area according to the compensation gray scale formula;
step S5, driving the display panel according to the compensation gray scale value of each display area to obtain the latest actual brightness value of each display area;
step S6, determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement; when each display area is up to dateWhen the actual brightness value reaches the preset brightness uniformity requirement, the display panel displays by adopting the compensation gray-scale value corresponding to the latest actual brightness value of each display area, otherwise, the steps S4-S6 are repeated until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement; the calculation formula of the theoretical gray scale value in step S1 is:
Figure FDA0002687725320000011
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient;
the compensation gray scale formula in step S4 is:
Figure FDA0002687725320000012
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
2. The method of claim 1, wherein the formula for calculating the theoretical gray-scale value is represented by the formula:
Figure FDA0002687725320000021
and (4) converting to obtain.
3. The method for adjusting brightness of a display panel according to claim 1, wherein Δ L ═ Li-LjWherein L isjActual brightness values for each display area.
4. A display panel brightness adjustment system, comprising: the display device comprises a display panel (10) and a brightness adjusting module (20) connected with the display panel (10);
the brightness adjusting module (20) is used for dividing the display panel (10) into M × N display areas, setting M and N to be positive integers, and obtaining a theoretical gray level value of each display area according to a preset gamma curve and an expected brightness value of each display area;
driving a display panel (10) according to the theoretical gray-scale value of each display area to obtain the actual brightness value of each display area;
determining whether the actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel (10) displays by adopting a theoretical gray scale value corresponding to the actual brightness value of each display area, otherwise, the difference value between the expected brightness value and the actual brightness value of each display area is determined, and the compensation gray scale value of each display area is obtained according to a compensation gray scale formula;
driving the display panel (10) according to the compensation gray-scale value of each display area to obtain the latest actual brightness value of each display area;
determining whether the latest actual brightness value of each display area meets the preset brightness uniformity requirement or not; when the latest actual brightness value of each display area reaches the preset brightness uniformity requirement, the display panel (10) displays by adopting a compensation gray scale value corresponding to the latest actual brightness value of each display area, otherwise, the difference value between the expected brightness value and the latest actual brightness value of each display area is repeatedly determined, the compensation gray scale value of each display area is obtained according to a compensation gray scale formula, the display panel (10) is driven according to the compensation gray scale value of each display area, and the latest actual brightness value of each display area is obtained until the latest actual brightness value of each display area reaches the preset brightness uniformity requirement; the calculation formula of the theoretical gray scale value is as follows:
Figure FDA0002687725320000031
wherein, GrayiFor each display area, a theoretical gray scale value, LiFor a desired luminance value, L, of each display area255For the maximum luminance value of each display region, f is a fixed coefficient;
the compensation gray scale formula is as follows:
Figure FDA0002687725320000032
wherein, Grayi+1For each display area compensated gray scale value, Δ L is the difference between the desired luminance value and the actual luminance value for each display area.
5. The system as claimed in claim 4, wherein the formula for calculating the theoretical gray-scale value is represented by the formula:
Figure FDA0002687725320000033
and (4) converting to obtain.
6. The display panel brightness adjustment system of claim 4, wherein Δ L-Li-LjWherein L isjActual brightness values for each display area.
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