WO2020215305A1

WO2020215305A1 - Display panel and compensation method therefor

Info

Publication number: WO2020215305A1
Application number: PCT/CN2019/084502
Authority: WO
Inventors: 杨文强
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2020-10-29
Also published as: CN113330505A

Abstract

A display panel and a compensation method therefor. The compensation method for the display panel comprises: dividing a display region of the display panel into X sub-regions, wherein X is an integer greater than or equal to 2 (S110); acquiring compensation data of at least one of the sub-regions during a sensing cycle, wherein a display period of the display panel comprises a display cycle (Td) and a sensing cycle (Ts), and the display panel is used to display a normal image during the display cycle (Td) (S120); and calculating a compensation value for the display region according to acquired compensation data of all of the sub-regions, and making compensation to images displayed in the display region during the display cycle (Td) (S130). Compensation data can be acquired while the display panel is in the normal display mode, thereby facilitating the use of the display panel for users.

Description

Display panel and compensation method thereof

Technical field

The invention relates to the field of display, in particular to a display panel and a compensation method thereof.

Background technique

The existing AMOLED (Active-matrix organic light-emitting diode, active matrix organic light-emitting diode) display panel includes a plurality of pixel units, and generally each pixel unit includes an OLED (organic light-emitting diode, organic light-emitting diode). The OLED is driven by a 2T1C pixel circuit. The 2T1C pixel driving circuit includes a driving thin film transistor T1, a switching thin film transistor T2, and a storage capacitor C, see FIG. 1. The driving thin film transistor T1 is electrically connected to the corresponding OLED. Due to the manufacturing process, the characteristics of the driving thin film transistor T1 and the OLED of different pixel units are different from each other. Even if the same driving voltage is used, the light emission consistency of the display panel is difficult to guarantee. In view of the above situation, in order to ensure the consistency of luminescence, the prior art provides two compensation methods, which are as follows:

1. Before the display panel leaves the factory, display the display panel on a specific compensation screen, take a picture with an external brightness acquisition device, and then calculate the compensation value through an external computing device according to the photo, and write the compensation value to the display panel. It is saved in the degenerate flash, and the compensation for the display panel display can be realized by calling the compensation value. However, this compensation method requires a lot of external equipment, the cost is relatively high, the process is more complicated, and after leaving the factory, as the display panel is used for a long time, it may drive the thin film transistor and the OLED aging and cause the characteristics to change. The compensation value previously obtained is no longer applicable, and no new compensation value can be obtained subsequently.

2. Another compensation method is to add a sensing circuit. Please refer to FIG. 2. The sensing circuit includes a sensing line Ls and a sensing thin film transistor T3. The sensing line Ls is electrically connected to the OLED through the sensing thin film transistor T3. The display mode of such a display panel generally includes a sensing mode and a normal display mode. The sensing mode runs before or after the power is turned off, and it takes a relatively long time to run the sensing mode once. In this sensing mode, the display panel displays a compensation picture, the compensation data of each OLED can be collected through the sensing line Ls, and then the corresponding compensation value is obtained through calculation, which can realize the compensation for the display of the display panel. However, with this compensation method, although the display panel can still obtain a new compensation value after leaving the factory, it takes a long time for the display panel to obtain a new compensation value. During this long time, the display panel cannot be used for Normal display, causing inconvenience to users.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a display panel and a compensation method thereof, which can collect compensation data while the display panel is normally displayed, which is convenient for users.

In order to solve the above technical problems, an embodiment of the first aspect of the present invention provides a compensation method for a display panel, including:

Divide the display area of the display panel into X sub-areas, where X is an integer greater than or equal to 2;

Collecting compensation data of at least one sub-area in one sensing period, wherein the display time period of the display panel includes a display period and a sensing period, and the display panel is used for displaying a normal picture during the display period;

Calculate the compensation value of the display area according to the compensation data of all the sub-areas collected, and compensate the display of the display area in the display period.

An embodiment of the second aspect of the present invention provides a display panel, including:

The partition unit is used to divide the display area of the display panel into X sub-areas, where X is an integer greater than or equal to 2;

The acquisition unit is used to acquire compensation data of at least one sub-area in a sensing period, wherein the display period of the display panel includes a display period and a sensing period, and the display panel is used for normal operation during the display period. Screen display;

The calculation compensation unit is used to calculate the compensation value of the display area according to the collected compensation data of all the sub-areas, and to compensate the display of the display area in the display period.

Implementing the embodiments of the present invention has the following beneficial effects:

Since the compensation data of at least one sub-area is collected in a sensing period, and the sensing period is included in the display time period of the display panel, the compensation data is collected without affecting the normal display of the display panel, which is convenient for users. Use, greatly improve the user experience. Moreover, the compensation value of the display area is calculated according to the collected compensation data of all the sub-areas, and the display of the display area during the display period is compensated, so that the compensation is timely and the luminous consistency of the display panel can be guaranteed. Furthermore, since the display area of the display panel is divided into X sub-areas, the compensation data of at least one sub-area is collected in one sensing period, and the time for collecting compensation data is very short, which can reduce the user's viewing of the display panel when collecting compensation data. The impact of the picture. In addition, the compensation method of the display panel of the present invention can compensate the display panel even after shipment.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

FIG. 1 is a schematic diagram of a display area of a display panel in the prior art;

Figure 2 is a schematic diagram of a prior art electrical connection between a sensing circuit and an OLED;

3 is a flowchart of a compensation method for a display panel according to an embodiment of the present invention;

4 is a schematic diagram of a display area of a display panel divided into X sub-areas according to an embodiment of the present invention;

5 is a schematic diagram of a display time period of a display panel according to an embodiment of the invention;

6 is a schematic diagram of a display screen corresponding to the display panel of FIG. 5;

FIG. 7 is a schematic diagram of the display panel collecting compensation data of X sub-areas in X sensing periods according to an embodiment of the present invention (the sub-areas indicated by diagonal lines represent the sub-areas where the compensation data is collected);

FIG. 8 illustrates a schematic diagram of a sensing cycle according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The terms "including" and "having" appearing in the specification, claims and drawings of this application and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment. In addition, the terms "first", "second", "third", etc. are used to distinguish different objects, but not to describe a specific sequence.

An embodiment of the present invention provides a compensation method for a display panel, where the display panel may be an OLED display panel, an LCD display panel, etc., and an AMOLED display panel is taken as an example for description in this embodiment. The display panel includes a display area and a non-display area, where the display area is a panel area used for normal display, and the non-display area is a panel area not used for display. A plurality of pixel units are arranged in the display area, and each pixel unit includes an OLED, a driving thin film transistor, a switching thin film transistor, a storage capacitor, a compensation thin film transistor, and the like. In this embodiment, the OLED is driven by a 2T1C pixel circuit. Of course, those skilled in the art can also know that the OLED can also be driven by other conventional pixel circuits such as 4T1C, which will not be repeated here. In this embodiment, the multiple pixel units are divided into multiple rows and multiple columns. In this embodiment, referring to FIG. 3, the compensation method includes the following steps.

S110: Divide the display area of the display panel into X sub-areas, where X is an integer greater than or equal to 2.

Referring to Figure 4, the display area of the display panel is divided into X sub-areas. Each sub-region may include one or more rows of pixel units. The number of rows of pixel units included in each sub-region may be the same or different. The pixel units included are different. In addition, in other embodiments of the present invention, each sub-region may also include one or more columns of pixel units, each sub-region may include one or more columns of pixel units, and the number of columns of pixel units included in each sub-region may be the same. It may be different, and the pixel units included in different sub-regions are different. In addition, in other embodiments of the present invention, the sub-region may also be composed of pixel units of some regions, and the region may be square, rectangular, or triangular, hexagonal, or the like.

S120: Collect compensation data of at least one sub-area within a sensing period Ts, where the display period of the display panel includes a display period Td and a sensing period Ts. During the display period Td, the display panel is used normally The display of the screen.

In this embodiment, the display period of the display panel is the period of normal display of the display panel, that is, the period of time after the display panel is turned on to before it is turned off. 5, the display time period of the display panel includes a display period Td and a sensing period Ts, the number of the display period Td is multiple, the number of the sensing period Ts is multiple, and the display period Td The panel is used for normal screen display. In this embodiment, the display panel displays a normal frame picture (Frame) in a display period Td, and the display panel displays a sensing frame picture in a sensing period Ts, see FIG. 6.

In this embodiment, in the sensing time period, the pixel units in the scanning area of the display panel are inputted with preset test grayscale data, and the preset test grayscale data is designed in advance, for example, a specific The gray-scale voltage and so on. The test grayscale data is not used for the normal display of the display panel, but is used to facilitate the collection of compensation data.

Referring to FIG. 7, in this embodiment, in one sensing period Ts, the display panel collects compensation data of a sub-area, the compensation data is, for example, compensation current data, etc. FIG. 7 illustrates the X sensing period Ts Sensing the frame picture. However, the present invention is not limited to this. In other embodiments of the present invention, the display panel can also collect compensation data of multiple sub-areas in one sensing period Ts. In this embodiment, how the display panel collects the compensation data of the sub-areas is a conventional technique in the art. For details, please refer to Fig. 2 and will not be repeated here.

Please refer to FIGS. 5-8. In this embodiment, the sensing period Ts includes a sensing sub-time period Tss and a display sub-time period Tsd. In the sensing sub-time period Tss, the display panel is used for collecting compensation data, and in the display sub-time period Tsd, the display panel is used for normal display. In this embodiment, the time length of the sensing sub-period Tss is generally an integer multiple of the turn-on time of a switch thin film transistor, and the time length of the display sub-period Tsd is generally an integer multiple of the turn-on time of a switch thin film transistor. By setting each sensing period Ts to include both the sensing sub-time and the display sub-period Tsd, further, within the sensing period Ts, the display panel can still output most of the image data, for example, refer to FIG. 7 , The area outside the shaded part is used to display the image, so the influence of the sensing sub-time period Tss on the normal display of the display panel can be reduced. In addition, in other embodiments of the present invention, the sensing period Ts may also include only the sensing sub-period Tss, excluding the display sub-period Tsd, and the sensing period Ts includes X sensing sub-periods Tss. The sensing period Ts completes the collection of compensation data for X sub-areas. This setting can reduce the time required to collect the compensation data of all pixels in the entire display area and improve efficiency. Such a setting may affect the normal display of the display panel. Slight effect, but because the sensing period Ts itself is very short, the average human eye cannot perceive it, so the effect is limited. In addition, in other embodiments of the present invention, the sensing period Ts may also include only the sensing sub-period Tss, and the remaining period of the sensing period Ts and the sub-regions thereof are input with specific grayscale data.

In this embodiment, one sensing period Ts includes one sensing sub-period Tss. However, the present invention is not limited to this. In other embodiments of the present invention, one sensing period Ts may also include multiple sensing sub-times and multiple display sub-periods Tsd, sensing sub-period Tss and display sub-periods Tsd is alternately set, and one or more display sub-time periods Tsd are separated between two adjacent sensing sub-time periods Tss. In other embodiments of the present invention, within a sensing period Ts, the sum of all sensing sub-time periods Tss is less than the sum of all display sub-time periods Tsd, that is, the sum of the time for normal display is greater than the sum of the time used for acquisition compensation The time sum of the data, this setting is also used to reduce the influence of the sensing sub-time period Tss on the normal display screen.

In this embodiment, step S120 specifically includes: collecting compensation data of a sub-region in a sensing sub-period Tss of a sensing period Ts, that is, a sensing sub-period Tss corresponds to a sub-region, and A sensing sub-time period Tss display panel collects compensation data of all pixel units in a sub-region. However, the present invention is not limited to this. In other embodiments of the present invention, one sensing sub-time period Tss may also collect compensation data of multiple sub-regions. In other embodiments of the present invention, when one sensing period Ts includes multiple sensing sub-time periods Tss, at this time, one sensing period Ts can collect compensation data of multiple sub-regions, and when one sensing period Ts includes X When there are two sensing sub-time periods Tss, at this time, one sensing period Ts can complete the collection of compensation data of X sub-regions.

Please continue to refer to FIGS. 5 and 6, in this embodiment, the sensing period Ts and the display period Td are alternately arranged, and there are N display periods Td between two adjacent sensing periods Ts, where N is a positive integer , For example, 1, 2, 3, 4, 5, etc. Generally speaking, the frequency of the display panel is 60 Hz, that is, 60 display periods Td are included in one second, that is, the display panel displays 60 normal frame pictures in one second. In this embodiment, the display panel is designed to have a frequency of 61 Hz, that is, the display panel displays one more picture in one second. This more picture is used to collect the compensation data of the sub-area, and this more picture corresponds to the sensing period Ts, that is, one second of the display panel includes 60 display periods Td and one sensing period Ts. In this embodiment, N is 60. Through this setting, the normal display of the sensing frame picture on the display panel can be reduced. influences. In addition, in other embodiments of the present invention, N is preferably greater than 60, such as 61, 70, 80, 90, 100, 110, 120, etc.

S130: Calculate the compensation value of the display area according to the collected compensation data of all the sub-areas, and compensate the display of the display area in the display period Td.

In this embodiment, through X sensing periods Ts, the compensation data of all sub-regions can be collected, that is, the compensation data of all X sub-regions are collected, and the display panel summarizes the compensation data of all sub-regions, and then calculates it. The compensation value of the display area, after the compensation value is obtained, the normal display of the display area in the display period Td is compensated, and the compensation is relatively timely, so that the luminous consistency of the display panel can be guaranteed. Moreover, in this embodiment, since the display area is divided into X sub-areas, and compensation data of at least one sub-area is collected within a sensing period Ts, the display panel can be displayed normally without affecting the user's viewing. Moreover, after the display panel is used for a long time, even if the characteristics of the driving thin film transistor and the OLED in the display unit are changed due to the aging, the display panel can collect the compensation value during the display period, and can correct the previously obtained compensation value. Or replace.

In this embodiment, after the display panel is working normally, the display panel can automatically collect compensation data without manual triggering by the user. After the compensation data of X display areas are collected, the display panel automatically calculates the compensation value; Then repeat the above acquisition-compensation value-compensation steps. This setting can correct and replace the previous compensation value in time, which helps the display panel to maintain a higher display quality. In addition, in other embodiments of the present invention, the compensation method of the present invention may be triggered by the user himself, that is, the user himself triggers and starts the compensation method of the present invention when the user needs it.

In this embodiment, after the step of calculating the compensation value of the display area according to the collected compensation data of all the sub-areas, the method further includes: storing the compensation value in the flash memory. In this embodiment, the flash memory is a non-volatile (Non-Volatile) memory, which is conducive to the long-term preservation of the compensation value and is beneficial to the display panel to call the data in the flash memory. Moreover, the flash memory can be erased and written many times, which is beneficial to the correction or replacement of the compensation value.

In addition, the present invention also provides a display panel corresponding to the compensation method described above, and the display panel includes:

An acquisition unit, which is used to acquire compensation data of at least one sub-area within a sensing period Ts, wherein the display period of the display panel includes a display period Td and a sensing period Ts, and the display is displayed in the display period Td. The panel is used to display the normal picture;

The calculating compensation unit is used to calculate the compensation value of the display area according to the collected compensation data of all the sub-areas, and to compensate the display of the display area in the display period Td.

It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts between the various embodiments, refer to each other. can. As for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment.

The above-disclosed are only preferred embodiments of the present invention. Of course, the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope of the present invention.

Claims

A compensation method for a display panel is characterized in that it includes:

Divide the display area of the display panel into X sub-areas, where X is an integer greater than or equal to 2;

Collecting compensation data of at least one sub-area in one sensing period, wherein the display time period of the display panel includes a display period and a sensing period, and the display panel is used for displaying a normal picture during the display period;

Calculate the compensation value of the display area according to the compensation data of all the sub-areas collected, and compensate the display of the display area in the display period.
3. The compensation method of claim 1, wherein the sensing period and the display period are alternately arranged, and there are N display periods between two adjacent sensing periods, wherein N is a positive integer.
The compensation method according to claim 2, wherein the N is greater than or equal to 60.
The compensation method according to any one of claims 1 to 3, wherein the sensing period includes a sensing sub-time period, and the step of collecting compensation data of at least one sub-area in one sensing period is specifically include:

Compensation data of one sub-area is collected in one sensing sub-period of one sensing period.
5. The compensation method of claim 4, wherein the sensing period includes a plurality of sensing sub-time periods.
The compensation method according to claim 5, wherein the sensing period includes X sensing sub-time periods, and the compensation data of the X sub-regions are collected in one sensing period.
5. The compensation method of claim 4, wherein the pixel units in the corresponding sub-regions in the sensing sub-period are input with preset test grayscale data.
The compensation method according to claim 4, wherein the sensing period further includes a display sub-period, during which the display panel is used for displaying a normal picture.
5. The compensation method according to claim 4, wherein in one sensing period, the sum of all the sensing sub-periods is less than the sum of all the display sub-periods.
The compensation method according to any one of claims 1 to 3, wherein each of the sub-regions includes at least one row of pixel units, and the pixel units included in different sub-regions are different.
The compensation method according to any one of claims 1-3, characterized in that, after the step of calculating the compensation value of the display area according to the collected compensation data of all the sub-areas, the method further comprises:

The compensation value is stored in the flash memory.
A display panel, characterized by comprising:

The partition unit is used to divide the display area of the display panel into X sub-areas, where X is an integer greater than or equal to 2;

The acquisition unit is used to acquire compensation data of at least one sub-area in a sensing period, wherein the display period of the display panel includes a display period and a sensing period, and the display panel is used for normal operation during the display period. Screen display;

The calculation compensation unit is used to calculate the compensation value of the display area according to the collected compensation data of all the sub-areas, and to compensate the display of the display area in the display period.