WO2023024934A1

WO2023024934A1 - Brightness adjustment method and device for display panel

Info

Publication number: WO2023024934A1
Application number: PCT/CN2022/112023
Authority: WO
Inventors: 卓圣田
Original assignee: 集创北方(珠海)科技有限公司
Priority date: 2021-08-23
Filing date: 2022-08-12
Publication date: 2023-03-02
Also published as: CN113744704A; CN113744704B; JP2024515694A

Abstract

Disclosed in the present invention are a brightness adjustment method and device for a display panel. The method comprises: acquiring brightness data of a plurality of pixels on a display panel; obtaining compensation data of the plurality of pixels on the basis of the brightness data of the plurality of pixels, preset target brightness data, and an aging curve of the pixels on the display panel; and driving the plurality of pixels using the compensation data, and performing aging processing on the plurality of pixels to adjust the brightness of the display panel to a target brightness. According to the present invention, the brightness of the display panel tends to be consistent without adding an additional DIC and an external memory, thereby improving the display uniformity of the display panel.

Description

Method and device for adjusting brightness of display panel

This application claims the priority of the Chinese invention application with the application date of August 23, 2021, the application number 202110966799.X, and the name "Brightness Adjustment Method and Device for Display Panel", and by referring to the above Chinese invention application in its entirety The description, claims, drawings and abstract are incorporated by reference in this application.

technical field

The invention relates to the field of display technology, in particular to a method and device for adjusting brightness of a display panel.

Background technique

Both LED (Light-Emitting Diode, light-emitting diode) display technology and OLED (Organic Light-Emitting Diode, organic light-emitting diode) display technology have received extensive attention in the field of flat panel information display. Both technologies have the advantages of self-illumination, high brightness, high contrast ratio, wide viewing angle, wide operating temperature range, and high reliability.

Both LED/OLED displays include corresponding display panels. Due to material differences in the production process and/or manufacturing process errors, etc., some display panels may have a mura phenomenon. Among them, mura refers to the phenomenon of various traces (such as bright and dark spots) caused by uneven brightness of pixels in the display panel, which will bring visual discomfort and seriously affect the quality of the liquid crystal panel. In order to improve mura defects, de-mura technology has been widely used. The de-mura technology improves the display uniformity of the display panel by changing the gray scale of the display screen according to the brightness and chromaticity shifts in different areas of the display panel. Currently commonly used de-mura forms include internal compensation and external compensation.

Internal compensation is to store the threshold voltage (Vth) of the TFT in its gate-source voltage (Vgs) in the compensation stage, and convert Vgs-Vth into current when it emits light. Since Vgs already contains Vth, when it is converted into current The influence of Vth is offset to achieve the consistency of the current. However, the compensation effect of internal compensation is limited to the threshold voltage shift (Vth shift) and power supply voltage drop (IR drop) of the drive circuit, and the compensation effect is limited.

External compensation is to detect the electrical or optical characteristics of the pixel through an external drive circuit or device, and then perform compensation, which is represented by the mass-produced OLED display device of LG. External compensation can be divided into optical and electrical according to the type of data detected. The optical method refers to reading the brightness signal through the optical CCD (Charge Coupled Device, Charge Coupled Device) after lighting the back panel, while the electrical method refers to reading the electrical signals of TFT and OLED through the sensing circuit. Among them, the electrical method is the same as the internal compensation, only the current difference can be known, and the compensation effect is limited. In contrast, the optical method has the best compensation effect and is the most widely used, but the optical method requires an additional DIC circuit (Display Integrated Circuit, display integrated circuit, the DIC circuit is mainly used to bring the compensation data into the display influence circuit, and Realize the operation of memory such as Falsh, SRAM) and a large amount of memory space (such as external Falsh, internal SRAM).

Therefore, it is necessary to provide an improved technical solution to overcome the above technical problems in the prior art.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a method and device for adjusting brightness of a display panel. Using the collected aging curve of pixels on the display panel, the brightness unevenness data collected by a brightness acquisition device (such as a camera) is passed through a high-temperature point The method of brightening the panel can make the brightness of the display panel tend to be consistent without adding an additional DIC circuit and an external memory, thereby improving the display uniformity of the display panel.

According to the first aspect of the present disclosure, there is provided a method for adjusting brightness of a display panel, including: acquiring brightness data of a plurality of pixels on the display panel;

Obtaining compensation data of the plurality of pixels based on brightness data of the plurality of pixels, target brightness data of the plurality of pixels, and an aging curve of pixels on the display panel;

The plurality of pixels are driven by the compensation data, and aging processing is performed on the plurality of pixels, so as to adjust the brightness of the display panel to a target brightness.

Optionally, acquiring brightness data of multiple pixels on the display panel includes:

controlling the display panel to display a test image;

The luminance data of multiple pixels on the display panel is acquired by using a luminance acquisition device.

Optionally, obtaining the compensation data of the plurality of pixels based on the luminance data of the plurality of pixels, the target luminance data of the plurality of pixels, and the aging curve of the pixels on the display panel includes:

acquiring the target luminance data based on the luminance data of the plurality of pixels;

Obtain a pre-collected aging curve of pixels on the display panel;

calculating and obtaining the difference between the brightness data of each pixel in the plurality of pixels and the target brightness data;

Obtain compensation data for each pixel in the plurality of pixels according to the difference and the aging curve.

Optionally, the aging curve is a functional relationship or a look-up table between the brightness difference when aging the pixel to the target brightness and the gray scale to be turned on under the first temperature and first time conditions.

Optionally, obtaining the target luminance data based on the luminance data of the plurality of pixels includes:

Obtaining a target luminance data set based on the minimum luminance data among the luminance data of the plurality of pixels and a preset error allowable range;

Any value in the target brightness data set is selected as the target brightness data.

Optionally, using the compensation data to drive the plurality of pixels, and performing aging processing on the plurality of pixels includes:

Correspondingly providing compensation data of the plurality of pixels to a plurality of pixels on the display panel;

At the first temperature, the display panel is controlled to drive the compensation data for a first time.

According to a second aspect of the present disclosure, there is provided a brightness adjustment device for a display panel, including: a brightness acquisition unit configured to acquire brightness data of a plurality of pixels on the display panel;

A generating unit, configured to obtain compensation data of the plurality of pixels according to the brightness data of the plurality of pixels, the target brightness data of the plurality of pixels, and the aging curve of the pixels on the display panel;

The aging processing unit is configured to provide an aging processing environment of a first temperature and a first time, so that the display panel can drive the compensation data under the aging processing environment to realize brightness adjustment.

Optionally, the brightness adjustment device also includes:

The target brightness data acquisition unit is configured to output target brightness data according to the brightness data of the plurality of pixels collected by the brightness acquisition unit and a preset error tolerance range.

Optionally, the brightness adjustment device also includes:

The memory is used to store the pre-collected aging curves of the pixels on the display panel.

Optionally, the display panel includes: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, a Mini- LED display panel, field emission display panel, plasma display panel, electrophoretic display panel or electrowetting display panel.

The beneficial effects of the present invention are: the present invention discloses a method and device for adjusting the brightness of a display panel, which adopts a brightness acquisition device (such as a camera) to collect brightness data of multiple pixels on the display panel, and uses pre-collected pixels on the display panel to The aging curve of each pixel is obtained to adjust the brightness of each pixel to the target brightness, that is, the compensation data, and then the display panel is aged by lighting the panel at high temperature, and the overbright pixels on the panel are aged to The target brightness can make the brightness of the display panel tend to be consistent without adding an additional DIC circuit and an external memory, thereby improving the display uniformity of the display panel.

It should be noted that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

Description of drawings

FIG. 1 shows a flow chart of a method for adjusting brightness of a display panel according to an embodiment of the present disclosure;

FIG. 2 shows a flow chart of a method for acquiring luminance data of multiple pixels on a display panel according to an embodiment of the present disclosure;

FIG. 3 shows a flowchart of a method for obtaining compensation data of multiple pixels according to an embodiment of the present disclosure;

Fig. 4a shows a schematic diagram of brightness distribution of a display panel in G160 grayscale according to an embodiment of the present disclosure;

Fig. 4b shows a schematic diagram of an aging curve provided according to an embodiment of the present disclosure;

Fig. 4c shows a schematic diagram of brightness distribution when the display panel is driven with compensation data according to an embodiment of the present disclosure;

FIG. 4d shows a schematic diagram of the brightness distribution of the display panel at the G160 gray scale after aging treatment according to an embodiment of the present disclosure;

FIG. 5 shows a schematic structural diagram of a brightness adjustment device for a display panel provided according to an embodiment of the present disclosure.

Detailed ways

In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a flow chart of a method for adjusting brightness of a display panel according to an embodiment of the present disclosure.

As shown in FIG. 1 , in the present disclosure, the method for adjusting brightness of a display panel includes: performing steps S1 to S3 .

Specifically, in step S1, brightness data of multiple pixels on the display panel are acquired.

Referring to FIG. 2 , the method for acquiring brightness data of multiple pixels on the display panel includes: controlling the display panel to display a test image (step S11); collecting and acquiring brightness data of multiple pixels on the display panel by a brightness acquisition device (step S12).

In this embodiment, when the display panel is controlled to display the test image, any grayscale value can be selected within the grayscale range of G0-G255 to light up multiple pixels on the display panel. Exemplarily, the test image displayed by the display panel may be composed of driving data corresponding to a single grayscale value, so that multiple pixels on the display panel (corresponding to all pixels on the display panel, and each pixel corresponds to brightness difference of one light-emitting element).

Optionally, the multiple pixels on the display panel correspond to some or all of the pixels on the display panel, and each pixel corresponds to a light emitting device on the display panel. Exemplarily, the display panel in the present disclosure may be a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel, a quantum dot display panel, a Mirco-LED display panel, Mini-LED display panel, field emission display panel, plasma display panel, electrophoretic display panel or electrowetting display panel.

Further, if the luminance acquisition device is a CCD camera, when acquiring the luminance data of multiple pixels on the display panel, the CCD camera can be used to shoot the test image displayed on the display panel, referring to Figure 4a (taking G160 gray scale as an example), Further, brightness distribution data of the display panel under the current gray scale can be obtained.

In step S2, the compensation data of the plurality of pixels is obtained based on the luminance data of the plurality of pixels, the target luminance data of the plurality of pixels, and the aging curve of the pixels on the display panel.

Referring to Fig. 3, step S2 may further include: acquiring target luminance data based on the luminance data of a plurality of pixels (step S21); acquiring the aging curve of pixels on the display panel collected in advance (step S22); calculating and obtaining each of the plurality of pixels The difference between the luminance data of the pixel and the target luminance data (step S23); obtain the compensation data of each pixel in the plurality of pixels according to the difference and the aging curve (step S24).

In this embodiment, obtaining the target brightness data based on the brightness data of multiple pixels includes: obtaining the target brightness data set based on the minimum brightness data among the brightness data of the multiple pixels and the preset error allowable range; selecting any of the target brightness data sets A value is used as target brightness data. For example, if the minimum luminance data among the luminance data of multiple pixels acquired by the luminance acquisition device is 100, and the preset error tolerance range is ±10%, then the target luminance data set that can be obtained is 100*90%～100 *110%, that is, between 90-110, that is to say, at this time, a value can be selected from the value range of 90-110 as the target brightness data. In this way, in the subsequent aging process of the display panel, it can be ensured that the brightness of all pixels can be adjusted uniformly. Of course, in other embodiments of the present invention, other methods can also be used to obtain the target pixel brightness. For example, among the brightness data of multiple pixels, the brightness data ranked 1/4 from small to large can be selected as the target brightness data ; or select the average value of the luminance data of the smallest part of the pixels as the target luminance data; or others. It can be understood that the enumeration of the above numerical values in the present invention is only exemplary, and can be selected according to actual conditions, and the present invention is not limited in comparison.

Further, if the difference between the minimum brightness data and other brightness data among the brightness data of multiple pixels is too large, the pixel corresponding to the brightness data can be checked to avoid affecting the display panel due to pixel damage. The brightness adjustment result helps to improve the accuracy of the brightness adjustment result.

In this embodiment, as shown in FIG. 4b, the pre-collected aging curve of the pixels on the display panel is aging the pixels to the target brightness under the conditions of a first temperature (such as 120° C.) and a first time (such as 1 hour). The functional relationship between the brightness difference at the time and the gray scale to be lit or a lookup table, which is used to characterize the difference between the brightness data of the pixel on the display panel and the target brightness data and the gray scale value that needs to be compensated Correspondence between. That is to say, when the difference between the luminance data of a certain pixel and the target luminance data is obtained, the grayscale value that needs to be loaded on the pixel in the subsequent aging process can be deduced based on the aging curve, that is, Obtain compensation data corresponding to the pixel.

In this embodiment, the aging curve is prior information, which can be obtained by measurement. Exemplarily, when collecting the aging curves of the pixels on the display panel to be tested, all the gray scales of G0 to G255 can be sequentially provided to pixels with the same specifications as the pixels (light-emitting devices) on the display panel to be tested, and sequentially collected The luminance decrease value of each gray scale in G0-G255 after aging for the first time (eg 1 hour) at the first temperature (eg 120° C.), and finally organize and form the aging curve. And further, the aging curve can be stored in the memory to facilitate subsequent recall.

In step S3, the compensation data is used to drive a plurality of pixels, and an aging process is performed on the plurality of pixels, so as to adjust the brightness of the display panel to the target brightness.

In this embodiment, step S3 further includes: correspondingly providing compensation data of a plurality of pixels to a plurality of pixels on the display panel; and controlling the display panel to drive the compensation data for a first time at a first temperature.

After obtaining the compensation data of the plurality of pixels, the compensation data of the plurality of pixels can be written into the storage unit. To perform aging treatment on multiple pixels on the display panel is to put the display panel at the first temperature (such as 120°C) and power on, read the compensation data of multiple pixels in the storage unit, and based on the compensation The data respectively drives the corresponding pixels on the display panel for the first time (for example, 1 hour), and uses the principle that the brightness of the pixels will decrease when they work at high temperature, so as to age the pixels that are too bright on the display panel to the target brightness.

Referring to FIG. 4c and FIG. 4d, FIG. 4c shows a schematic diagram of the brightness distribution of the display panel when the compensation data is driven immediately after power-on. In the displayed image, the brightness data of multiple pixels are higher than the target brightness data. Figure 4d shows a schematic diagram of the luminance distribution on the display panel when the display panel is operated at the first temperature (such as 120° C.) for the first time (such as 1 hour) after aging treatment, when the gray scale of G160 is driven again. In the displayed image, the brightness data of multiple pixels tends to be consistent. Furthermore, it can be known that the present invention adjusts the brightness of the display panel through the aging treatment of the high-temperature lighting panel, which can make the brightness of the display panel tend to be consistent without adding additional DIC circuits and external memory, and improves the brightness of the display panel. display uniformity.

It should be noted that the aging treatment conditions set in this disclosure (including the aging treatment conditions when collecting the aging curve and the aging treatment conditions when the display panel is subjected to aging treatment after obtaining the compensation data, it should be noted that the aging treatment conditions of the two The treatment conditions should be the same) as 1 hour at 120°C, but this condition is only used as an example. The actual aging treatment conditions can be arbitrary, and should be reasonably selected according to the actual situation. For example, in order to shorten the production time, you can also The aging treatment conditions are set at 200° C. for 10 minutes, etc., which are not limited in the present invention.

Further, in the process of collecting the aging curve and in the process of adjusting the brightness of the display panel in the present invention, the ambient light brightness in the test environment is the same, so that it can ensure that multiple The accuracy and reliability of the luminance data of the pixels is helpful to improve the accuracy of the luminance adjustment result of the display panel.

Optionally, after the aging process of the plurality of pixels on the display panel is completed, step S1 may be performed again to verify the brightness adjustment result of the display panel to ensure that the adjustment result can meet the requirements.

Furthermore, the present invention also discloses a brightness adjustment device of a display panel, as shown in FIG. 5 , the device includes: a brightness acquisition unit 100 , a generation unit 200 and an aging processing unit 300 .

Wherein, the brightness acquisition unit (that is, the aforementioned brightness acquisition device, such as a CCD camera) 100 is used to collect brightness data of multiple pixels on the display panel. The generation unit 200 is connected with the brightness acquisition unit 100, and is used for obtaining compensation data of a plurality of pixels according to the brightness data of a plurality of pixels, target brightness data of a plurality of pixels, and aging curves of pixels on the display panel. The burn-in processing unit 300 is connected with the generating unit 200 and configured to provide an burn-in processing environment of a first temperature and a first time, so that the display panel can drive compensation data under the burn-in processing environment to realize brightness adjustment.

Further, the brightness adjustment device of the display panel further includes: a target brightness data acquisition unit 400 . The target luminance data acquisition unit 400 is respectively connected with the luminance acquisition unit 100 and the generation unit 200 , and is used to output the target luminance data according to the luminance data of multiple pixels collected by the luminance acquisition unit 100 and the preset error allowable range.

Further, the brightness adjustment device of the display panel further includes: a memory 500 . The memory 500 is used for storing aging curves of pixels on the display panel collected in advance. Wherein, the aging curve stored in the memory 500 is a functional relationship between the brightness difference when the pixels on the display panel are aged to the target brightness and the required gray scale under the first temperature and first time conditions Or a lookup table.

It should be understood that the brightness adjustment device of the display panel disclosed in the present invention can be used to implement the brightness adjustment method of the display panel as shown in Fig. 1 to Fig. 4d, therefore, the brightness of the display panel shown in this embodiment For the specific working principle of each component unit in the adjustment device, reference may be made to the description of the method for adjusting the brightness of the display panel above, which will not be repeated here.

It should be noted that the technical solution disclosed in the present invention can age the overbright pixels on the display panel to the target brightness, and has a wide range of applications. For example, it can be applied to any display product, that is to say, the display panel in this embodiment can include: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light-emitting diode display panel, an organic light-emitting diode Display panel, quantum dot display panel, Mirco-LED display panel, Mini-LED display panel, field emission display panel, plasma display panel, electrophoretic display panel or electrowetting display panel. Among them, a light emitting diode display panel LED or an organic light emitting diode display panel OLED is preferred.

To sum up, the present invention collects the brightness data of multiple pixels on the display panel, and uses the pre-collected aging curve to obtain the gray scale required to adjust the brightness of each pixel to the target brightness, and then lights up the panel at high temperature. When performing aging treatment on the display panel, the overbright pixels on the panel can be aged to the target brightness, and the brightness of the display panel can be made to be consistent without adding additional DIC circuits and external memory, which improves the Display uniformity of the display panel. At the same time, the technical solution of the present invention is applicable to all display products and has a wide application range.

Finally, it should be noted that obviously, the above-mentioned embodiments are only examples for clearly illustrating the present invention, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

A method for adjusting brightness of a display panel, comprising:

Obtain brightness data of multiple pixels on the display panel;

Obtaining compensation data of the plurality of pixels based on brightness data of the plurality of pixels, target brightness data of the plurality of pixels, and an aging curve of pixels on the display panel;

The plurality of pixels are driven by the compensation data, and aging processing is performed on the plurality of pixels, so as to adjust the brightness of the display panel to a target brightness.
The brightness adjustment method according to claim 1, wherein acquiring brightness data of a plurality of pixels on the display panel comprises:

controlling the display panel to display a test image;

The luminance data of multiple pixels on the display panel is acquired by using a luminance acquisition device.
The brightness adjustment method according to claim 1, wherein the brightness of the plurality of pixels is obtained based on the brightness data of the plurality of pixels, the target brightness data of the plurality of pixels, and the aging curve of the pixels on the display panel. Compensation data includes:

acquiring the target luminance data based on the luminance data of the plurality of pixels;

Obtain a pre-collected aging curve of pixels on the display panel;

calculating and obtaining the difference between the brightness data of each pixel in the plurality of pixels and the target brightness data;

Obtain compensation data for each pixel in the plurality of pixels according to the difference and the aging curve.
The brightness adjustment method according to claim 3, wherein the aging curve is the difference between the brightness difference when the pixel is aged to the target brightness and the gray scale to be turned on under the conditions of the first temperature and the first time. Function relation or lookup table.
The brightness adjustment method according to claim 3, wherein obtaining the target brightness data based on the brightness data of the plurality of pixels comprises:

Obtaining a target luminance data set based on the minimum luminance data among the luminance data of the plurality of pixels and a preset error allowable range;

Any value in the target brightness data set is selected as the target brightness data.
The brightness adjustment method according to any one of claims 1-5, wherein, using the compensation data to drive the plurality of pixels, and performing aging processing on the plurality of pixels comprises:

Correspondingly providing compensation data of the plurality of pixels to a plurality of pixels on the display panel;

At the first temperature, the display panel is controlled to drive the compensation data for a first time.
A brightness adjustment device for a display panel, comprising:

a brightness acquisition unit, configured to collect brightness data of a plurality of pixels on the display panel;

a generating unit, configured to obtain compensation data of the plurality of pixels according to the luminance data of the plurality of pixels, the target luminance data of the plurality of pixels, and the aging curve of the pixels on the display panel;

The aging processing unit is configured to provide an aging processing environment of a first temperature and a first time, so that the display panel can drive the compensation data under the aging processing environment to realize brightness adjustment.
The brightness adjustment device according to claim 7, wherein the brightness adjustment device further comprises:

The target brightness data acquisition unit is configured to output target brightness data according to the brightness data of the plurality of pixels collected by the brightness acquisition unit and a preset error tolerance range.
The brightness adjustment device according to claim 7, wherein the brightness adjustment device further comprises:

The memory is used to store the pre-collected aging curves of the pixels on the display panel.
The brightness adjusting device according to claim 9, wherein the aging curve is the difference between the brightness difference when the pixel is aged to the target brightness and the required gray scale under the conditions of the first temperature and the first time. Function relation or lookup table.
The brightness adjustment device according to any one of claims 7-10, wherein the display panel comprises: a cathode ray tube display panel, a digital light processing display panel, a liquid crystal display panel, a light emitting diode display panel, an organic light emitting diode display panel panel, quantum dot display panel, Mirco-LED display panel, Mini-LED display panel, field emission display panel, plasma display panel, electrophoretic display panel or electrowetting display panel.