WO2024036864A1

WO2024036864A1 - Driving compensation circuit, compensation method, and display device

Info

Publication number: WO2024036864A1
Application number: PCT/CN2022/142510
Authority: WO
Inventors: 黄佩迪; 郑浩旋
Original assignee: 惠科股份有限公司
Priority date: 2022-08-19
Filing date: 2022-12-27
Publication date: 2024-02-22
Also published as: CN115223501A; CN115223501B

Abstract

A driving compensation circuit (100, 200, 300), a compensation method, and a display device (1000), capable of avoiding the problem of afterimages in a display picture caused by different aging rates of different luminescent materials. A timing control module (40) of the driving compensation circuit (100, 200, 300) acquires display times of a plurality of display blocks of a display panel (10); a control module (50) obtains brightness attenuation differences according to the display times; a data compensation module (60) obtains compensation data according to the brightness attenuation differences; the timing control module (40) controls a driving module (70) according to the brightness attenuation differences to perform display compensation on corresponding display blocks according to the compensation data when the display panel (10) is in an unused state.

Description

Drive compensation circuit, compensation method and display device

This application claims priority to the Chinese patent application submitted to the China Patent Office on August 19, 2022, with the application number 202211000964.7 and the application name "Drive Compensation Circuit, Compensation Method and Display Device", the entire content of which is incorporated herein by reference. Applying.

Technical field

The present application relates to the field of display technology, and in particular, to a driving compensation circuit, a compensation method for the driving compensation circuit, and a display device including the driving compensation circuit.

Background technique

With the development of display technology and the upgrading of screens in the optoelectronic display industry, organic light-emitting diode (OLED) displays have gradually entered the public eye. OLED displays require no backlight, have good flexibility, wide viewing angles, and pictures. The advantages of uniform quality, fast response speed, and rich colors are becoming more and more common, and they are most obvious in products such as mobile phones, media players, and small entry-level TVs. OLED displays use current to trigger self-luminous elements to emit light. They mainly drive organic semiconductor materials and luminescent materials through an electric field to achieve luminescence through carrier injection and recombination, without the need for a backlight.

However, due to the different attenuation rates of different self-luminous element materials, different self-luminous elements age inconsistently under the same current after long-term use, resulting in insufficient brightness of some light-emitting elements, which in turn easily causes the problem of afterimages in the display screen.

Contents of the invention

The purpose of this application is to provide a driving compensation circuit, a compensation method and a display device. A control module and a data compensation module are provided in the drive compensation circuit to obtain the brightness attenuation difference of each display area. The brightness attenuation difference is then used to perform display compensation on some display blocks to balance the problem of afterimages in the display screen caused by the different aging speeds of the luminescent materials in different display blocks, effectively improving the display effect and display of the display device. taste.

In order to achieve the purpose of this application, this application provides the following technical solutions:

In a first aspect, the present application provides a driving compensation circuit, which includes a timing control module and a driving module that are both electrically connected to a display panel. The timing control module drives the driving module to control the display panel to display images. . The drive compensation circuit also includes a control module and a data compensation module. The control module is electrically connected to the timing control module and the data compensation module. The data compensation module is also connected to the drive module. electrical connection;

The timing control module obtains the display times of multiple display blocks of the display panel, and transmits the multiple display times to the control module; the control module obtains multiple display times based on the multiple display times. a brightness attenuation difference value, and transmit the brightness attenuation difference value to the timing control module and the data compensation module; the data compensation module obtains compensation data according to a plurality of the brightness attenuation difference values, and The compensation data is transmitted to the driving module;

The timing control module controls the driving module to perform display compensation on some display blocks of the display panel when it is in an unused state according to the compensation data according to the brightness attenuation difference.

In a second aspect, this application also provides a compensation method, which includes:

Obtain the brightness decay rate of different luminescent materials corresponding to different initial brightness;

Obtain the display time of each display block of the display panel through the timing control module;

The brightness attenuation difference is obtained by the control module according to the brightness attenuation rate and the display time of each display block;

Compensation data is obtained according to the brightness attenuation difference value, and display compensation is performed on part of the display blocks of the display panel according to the brightness attenuation difference value and the compensation data.

In a third aspect, the present application also provides a display device, which includes a display panel and the above-mentioned drive compensation circuit, where the drive compensation circuit is used to perform display compensation on the display panel.

To sum up, in the drive compensation circuit, compensation method and display device of the present application, in the drive compensation circuit, compensation method and display device provided by the present application, a control module and data compensation are provided in the drive compensation circuit. The module obtains the display time of each display block through the timing control module, and then obtains the brightness attenuation value of each display block and the brightness attenuation difference value of each display block. Furthermore, the brightness attenuation difference is used to perform display compensation on some display blocks to balance the problem of afterimages in the display screen caused by the different aging speeds of the luminescent materials in different display blocks, thereby improving the service life of the display panel. The display effect and display taste of the display device are effectively improved. Furthermore, the display effect and service life of the display device are also effectively improved. Moreover, it also overcomes the problem of increased manufacturing costs caused by increasing the sub-pixel area in the prior art to overcome the residual image of the display screen. Therefore, the technical solution of this application adjusts the R, G, and B luminescence by confirming the attenuation speed of different light-emitting elements. The component keeps its attenuation rate and aging speed as consistent as possible to avoid image afterimage problems caused by different attenuation rates and aging speeds, and the manufacturing cost is also low.

Description of drawings

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic diagram of the principle of a light-emitting element disclosed in an embodiment of the present application;

Figure 2 is an attenuation diagram of the luminous brightness of the light-emitting element shown in Figure 1 as a function of time and cathode voltage;

Figure 3 is a schematic structural diagram of a display device disclosed in an embodiment of the present application;

Figure 4 is a schematic structural diagram of the sub-pixel unit in the display panel shown in Figure 3;

Figure 5 is a schematic functional structural diagram of a drive compensation circuit disclosed in the embodiment of the present application;

Figure 6 is a schematic structural diagram of another drive compensation circuit disclosed in the embodiment of the present application;

Figure 7 is a schematic structural diagram of yet another drive compensation circuit disclosed in the embodiment of the present application;

Figure 8 is a schematic flow chart of a compensation method disclosed in the embodiment of the present application;

Figure 9 is a schematic flow chart of step S10 of the compensation method shown in Figure 8;

FIG. 10 is a schematic flowchart of step S30 of the compensation method shown in FIG. 8 .

Detailed ways

In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the accompanying drawings. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and comprehensive understanding of the disclosure of the present application.

The following description of the embodiments refers to the accompanying drawings to illustrate specific embodiments in which the present application may be implemented. The serial numbers assigned to components in this article, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meaning. The terms "connection" and "connection" mentioned in this application include direct and indirect connections (connections) unless otherwise specified. The directional terms mentioned in this application, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are only Reference is made to the direction of the attached drawings. Therefore, the directional terms used are for the purpose of better and clearer description and understanding of the present application, and are not intended to indicate or imply that the device or component referred to must have a specific orientation or be in a specific orientation. construction and operation, and therefore should not be construed as limitations on this application.

In the description of this application, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Ground connection, or integral connection; it can be a mechanical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood on a case-by-case basis. It should be noted that the terms "step 1", "step 2", etc. in the description, claims and drawings of this application are used to distinguish different objects, rather than describing a specific sequence. The terms “first”, “second”, etc. in the description, claims, and drawings of this application are used to distinguish different objects, rather than describing a specific sequence. In addition, the terms "include", "can include", "include", or "can include" used in this application indicate the existence of the corresponding disclosed functions, operations, elements, etc., and do not limit other one or more more Functions, operations, components, etc. Furthermore, the term "comprises" or "comprises" indicates the presence of the corresponding features, numbers, steps, operations, elements, components, or combinations thereof disclosed in the specification, but does not exclude the presence or addition of one or more other features, numbers, steps, Operations, elements, parts, or combinations thereof, are intended to cover non-exclusive inclusion. It should also be understood that "at least one" described in this article means one and more, such as one, two or three, etc., while "plurality" means at least two, such as two or three etc., unless otherwise expressly and specifically limited.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing specific embodiments only and is not intended to limit the application.

Please refer to FIG. 1 , which is a schematic diagram of the principle of a light-emitting element disclosed in an embodiment of the present application. As shown in Figure 1, the light-emitting element may mainly include an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer and a cathode that are stacked in sequence. In this embodiment of the present application, the light-emitting element may be an organic light-emitting diode (OLED).

It can be understood that the emission of organic light-emitting diodes is mainly driven by an electric field, and organic semiconductor materials and luminescent materials achieve luminescence through carrier injection and recombination. In the embodiment of the present application, an indium tin oxide (Indium Tin Oxide, ITO) glass transparent electrode is used as the anode of the organic light-emitting diode, and the metal electrode is used as the cathode of the organic light-emitting diode. The cathode of the organic light-emitting diode is electrically connected to the negative electrode of the power supply, and the anode of the organic light-emitting diode is electrically connected to the positive electrode of the power supply. Driven by a power supply, electrons are transported from the cathode of the organic light-emitting diode to the light-emitting layer through the electron transport layer, and holes are injected from the anode of the organic light-emitting diode to the light-emitting layer through the hole injection layer and the hole transport layer. After that, electrons and holes meet in the light-emitting layer to generate excitons, which excite the light-emitting molecules and produce a light source after radiation.

Please refer to Figure 2, which is an attenuation diagram of the luminous brightness of the light-emitting element shown in Figure 1 as a function of time and cathode voltage. As shown in FIG. 2 , the abscissa axis represents time, the major ordinate axis represents the cathode voltage of the light-emitting element, and the minor ordinate axis represents the brightness of the light-emitting element. The two curves in the figure are obtained when the power supply supplies a constant current to the light-emitting element.

This kind of light-emitting element is a self-luminous element with a thin film of organic compounds on its surface. It can be seen from the curve that as time increases, the cathode voltage of the light-emitting element gradually increases and the brightness gradually decreases. This phenomenon of gradual decrease in brightness over time is caused by attenuation. Then, when using a display panel made of this kind of light-emitting element, there will be a part of the display screen that is close to a fixed screen. When a fixed area on the screen always displays a fixed screen for a long time, it will cause this part of the area to correspond to The decay rate of the luminescent material of the luminescent element exceeds that of other dynamic picture parts, and the aging rate of the luminescent material will also be accelerated accordingly. When this part of the material is attenuated, its luminous efficiency becomes lower. Under the same driving current, the display brightness of this part of the material decreases; after a period of time, an afterimage will appear.

As a result, the luminous efficiency of the light-emitting elements in the corresponding area of the fixed screen is reduced. Driven by the same current as before, the brightness of this part of the light-emitting elements gradually decreases. After a period of time, an afterimage will appear, thus affecting the display effect. and taste.

It is understandable that the brightness attenuation of the light-emitting element is also caused by other factors such as temperature.

Please refer to FIG. 3 , which is a schematic structural diagram of a display device 1000 disclosed in an embodiment of the present application. As shown in FIG. 3 , the display device 1000 provided by the embodiment of the present application may at least include a display panel 10 , a power module 20 and a support frame 30 . The display panel 10 is fixed to the support frame 30 , and the power module 20 It is disposed on the back of the display panel 10 , that is, the non-display surface of the display panel 10 , that is, the side of the display panel 10 facing away from the user. The display panel 10 is used to display images. The power module 20 is electrically connected to the display panel 10 and is used to provide power supply voltage for the display panel 10 to display images. The support frame 30 is the display panel. 10 and the power module 20 provide support and protection.

It can be understood that the display panel 10 also has a display surface arranged opposite to the non-display surface, that is, the front side of the display panel 10 , that is, the side of the display panel 10 facing the user. The display surface is used to face a user using the display device 1000 to display images.

Please refer to FIG. 4 , which is a schematic structural diagram of the sub-pixel unit 15 in the display panel 10 shown in FIG. 3 . As shown in FIG. 4 , in the embodiment of the present application, the display panel 10 includes a plurality of scan lines S1-Sn (Scan line) extending along the first direction F1 and arranged in a grid shape with each other. Multiple data lines D1-Dm (Data line) extending in direction F2. Wherein, the first direction F1 and the second direction F2 are perpendicular to each other, and between the plurality of scanning lines S1-Sn, between the plurality of data lines D1-Dm, and between the scanning lines S1-Sn and the data lines D1-Dm. are insulated from each other. That is, the plurality of scan lines S1-Sn are arranged at intervals along the second direction F2 and are insulated from each other, and the plurality of data lines D1-Dm are arranged at intervals along the first direction F1 and are insulated from each other. , the plurality of scan lines S1-Sn and the plurality of data lines D1-Dm are insulated from each other.

The sub-pixel units 15 are respectively provided at the intersections of the plurality of scanning lines S1-Sn and the data lines D1-Dm. Specifically, the sub-pixel unit 15 is provided between any two adjacent scan lines and any two adjacent data lines, and the sub-pixel units 15 located in the same column are electrically connected to the same data line. Connection, the sub-pixel units 15 located in the same row are electrically connected to the same scan line. In this embodiment of the present application, a plurality of sub-pixel units 15 are distributed in an array.

In this embodiment of the present application, the sub-pixel unit 15 includes a first transistor T1, a second transistor T2, a storage capacitor Cg and a light-emitting element 151. The first transistor T1 serves as a switch for addressing, and the second transistor T2 is used to provide driving current for the light-emitting element 151 . The storage capacitor Cg is used to store the input image data voltage.

When the display panel 10 displays, a scanning signal at a second potential is applied to each row of scanning lines in turn to turn on the first transistor T1, and the data signal Data on the data line is written into the storage capacitor Cg for storage. The voltage of the storage capacitor Cg controls the opening of the second transistor T2 to control the amount of current flowing through the light-emitting element 151 .

In addition, when a scan signal at the first potential is applied to a scan line, the first transistor T1 is in the off state, and the voltage of the storage capacitor Cg is used to maintain the working state of the second transistor T2, maintaining the The light-emitting element 151 continues to emit light until the next scanning period arrives.

In an exemplary embodiment, when a low-level scan signal is applied to the first row scan line, the first transistor T1 is turned on, and the data signal on the data line is written into the storage capacitor Cg for storage; the storage The voltage of the capacitor Cg controls the opening of the second transistor T2 to control the current flowing through the light-emitting element 151 . When a high-level scan signal is applied to the first row of scan lines, the first transistor T1 is closed, and the voltage of the storage capacitor Cg is used to maintain the operation of the second transistor T2 and keep the light-emitting element 151 continuing to emit light until The next scan cycle arrives.

Please refer to FIG. 5 , which is a schematic functional structure diagram of a driving compensation circuit 100 disclosed in an embodiment of the present application. As shown in Figure 5, this application provides a driving compensation circuit 100. The driving compensation circuit 100 includes:

The timing control module 40 is electrically connected to the display panel 10 and is used to obtain the display time of multiple display blocks of the display panel 10 .

The control module 50 is electrically connected to the timing control module 40 , and the timing control module 40 transmits multiple display times to the control module 50 . The control module 50 obtains corresponding multiple brightness attenuation difference values according to the multiple received display times. Wherein, the brightness attenuation difference value includes information representing the compensation time and the compensation brightness. The control module 50 transmits the brightness attenuation difference to the timing control module 40 .

The data compensation module 60 is electrically connected to the control module 50 , and the control module 50 also transmits the plurality of brightness attenuation differences to the data compensation module 60 . The data compensation module 60 is configured to obtain corresponding compensation data according to the received plurality of brightness attenuation differences.

The driving module 70 is electrically connected to the timing control module 40, the data compensation module 60 and the display panel 10. The data compensation module 60 obtains the brightness attenuation difference value based on the received values. Compensate data and transmit the compensation data to the driving module 70 . The timing control module 40 drives the driving module 70 according to the brightness attenuation difference to perform corresponding display according to the compensation data when the display panel 10 is in an unused state (that is, in a screen-off state or a power-off state). block for display compensation.

In this embodiment of the present application, the driving compensation circuit 100 includes a timing control module 40 and a driving module 70. The driving module 70 is electrically connected to the timing control module 40 and the display panel 10. The timing control module 70 is electrically connected to the timing control module 40 and the display panel 10. The module 40 drives the driving module 70 to control the display panel 10 to display images. The drive compensation circuit 100 also includes a control module 50 and a data compensation module 60. The control module 50 is electrically connected to the timing control module 40, and the data compensation module 60 is simultaneously connected to the control module. 50 is electrically connected to the driving module 70 , and the timing control module 40 is also electrically connected to the display panel 10 .

The timing control module 40 is used to obtain the display times of multiple display blocks of the display panel 10 and transmit the multiple display times to the control module 50;

The control module 50 obtains a plurality of brightness attenuation difference values according to the received multiple display times, wherein the brightness attenuation difference values include information representing the compensation time and the compensation brightness, and the control module 50 attenuates the brightness The difference is transmitted to the timing control module 40 and the data compensation module 60;

The data compensation module 60 is used to obtain compensation data according to the received plurality of brightness attenuation differences, and transmit the compensation data to the driving module 70 .

When the display panel 10 is in an unused state (ie, in a screen-off state or a power-off state), the timing control module 40 controls the driving module 70 to adjust the brightness according to the brightness attenuation difference according to the compensation data. Some display blocks of the display panel 10 perform display compensation.

In this embodiment of the present application, the display panel 10 is divided into multiple display blocks, and each display block includes multiple sub-pixel units 15 . Correspondingly, each display block includes an equal or multiple number of light-emitting elements 151 as the sub-pixel units 15 .

When the user normally uses the display panel 10 to display images, the timing control module 40 obtains the display time of each display block. Specifically, the counting module of the timing control module 40 counts the display time of each display block to obtain the display time corresponding to each block.

Taking the screen resolution of the display panel 10 as 1920*1080 as an example to illustrate the specific implementation. In a specific embodiment of the present application, the display panel 10 can be divided into 10 display blocks, and the number of sub-pixel units 15 in each display block is 192*108. Correspondingly, each display block can include 192*108 light-emitting elements 151. When the user normally uses the display panel 10 to display images, the timing control module 40 obtains the display time of each display block of the display panel 10 . Specifically, the counting module of the timing control module 40 counts the display time of each display block to obtain the display time corresponding to each block.

In this embodiment of the present application, the timing control module 40 may be a time sequence controller (Time controller, T-CON), which is not specifically limited in this application.

In this embodiment of the present application, the brightness attenuation rates Lx of different luminescent materials corresponding to different initial luminous luminances are pre-stored in the control module 50 . Wherein, the brightness attenuation rate is the brightness attenuation rate of the luminescent material per unit time.

In this embodiment of the present application, the control module 50 can obtain the brightness attenuation value of each block corresponding to the display time according to the brightness attenuation rate Lx and the display time of each block.

Since the brightness of the display block corresponding to the fixed picture attenuates faster than the display block corresponding to the dynamic picture, the control module 50 obtains the brightness attenuation value according to the multiple brightness attenuation values of the display block corresponding to the dynamic picture. Default attenuation value. Wherein, the preset attenuation value may be an average of multiple brightness attenuation values corresponding to the display block displaying the dynamic picture, which is not specifically limited in this application.

In the embodiment of the present application, the preset attenuation value is obtained only based on the brightness attenuation value of the display block that displays the dynamic picture. Since the absolute value of the brightness attenuation value of the display block that displays the dynamic picture is small, the preset attenuation value is obtained based on the brightness attenuation value of the display block that displays the dynamic picture. The absolute value of the preset attenuation value is smaller. Furthermore, the obtained preset attenuation value level is relatively high, which not only improves the efficiency of obtaining the preset attenuation value, but also compensates for more display blocks with unbalanced brightness attenuation values, making the display block of the display panel The brightness attenuation value is more uniform, improving the display effect.

For example, if a display panel 10 is divided into five blocks, the brightness attenuation values of each block are 1%, 1.2%, 1.3%, 2.1%, and 2.1%. Among them, 1%, 1.2% and 1.3% are the brightness attenuation values of the display block corresponding to the dynamic picture, and 2.1% and 2.1% are the brightness attenuation values of the display block corresponding to the fixed picture.

If the preset attenuation value obtained by directly averaging the brightness attenuation values of all display areas of the display panel 10 (i.e. 1%, 1.2%, 1.3%, 2.1%, 2.1%) is 1.54%, then the brightness needs to be adjusted The display blocks with attenuation values of 2.1% and 2.1% are displayed and compensated so that the compensation value of the corresponding display block is equal to 1.54%. After compensation, the brightness attenuation values of the display panel are 1%, 1.2%, 1.3%, 1.54% and 1.54%.

If the preset attenuation value obtained by averaging the brightness attenuation values (i.e. 1%, 1.2%, 1.3%) of the display block corresponding to the dynamic picture is 1.16%, then the brightness attenuation values need to be 1.2%, 1.3%, Display compensation is performed on 2.1% and 2.1% of the display blocks, so that the compensation value of the corresponding display blocks is equal to 1.16%. After compensation, the brightness attenuation values of the display panel are 1%, 1.16%, 1.16%, 1.16%, 1.16%.

It can be seen from the compensated brightness attenuation value that the brightness attenuation value of the display block corresponding to the dynamic picture is averaged to obtain the preset attenuation value, and then the display block of the display panel 10 is displayed and compensated to obtain the brightness attenuation of the display panel. The degree is more even. Furthermore, the display effect of the display panel 10 is further improved.

The control module 50 is also used to compare each brightness attenuation value with the preset attenuation value, and obtain a plurality of brightness attenuation difference values, where the brightness attenuation difference value is the sum of the brightness attenuation value and the preset attenuation value. difference.

When the absolute value of the brightness attenuation value is greater than the absolute value of the preset attenuation value, the brightness attenuation difference is a negative value. When the absolute value of the brightness attenuation value is less than or equal to the absolute value of the preset attenuation value, the brightness attenuation difference is a non-negative value.

In the embodiment of the present application, when the brightness attenuation difference is a negative value, the control module 50 transmits the brightness attenuation difference to the data compensation module 60 and the timing control module 40, so The brightness attenuation difference is used to perform display compensation on the corresponding display block.

In the embodiment of the present application, when the brightness attenuation difference is a non-negative value, it means that there is no need to perform display compensation on the display area of the display panel 10 corresponding to the brightness attenuation difference.

In this embodiment of the present application, the data compensation module 60 is configured to output compensation data to the driving module 70 according to the received brightness attenuation difference. Further, the driving module 70 performs display compensation on the corresponding display block according to the compensation data.

In a specific embodiment of the present application, the driving module 70 includes a data driving module 71 and a scan driving module 72 . The data driving module 71 and the scanning driving module 72 are electrically connected to the timing control module 40 , the data compensation module 60 and the display panel 10 respectively at the same time.

Wherein, the timing control module 40 drives the scan driving module 72 to scan the corresponding display block according to the compensation data according to the compensation time included in the brightness attenuation difference; the timing control module 40 drives the scan driving module 72 according to the compensation time included in the brightness attenuation difference; The data driving module 71 of the compensation brightness control transmits the power signal to the corresponding display block according to the compensation data, and then performs display compensation on the corresponding display block of the display panel 10 .

In this embodiment of the present application, display compensation may refer to performing low-grayscale display on a display block with a negative brightness attenuation difference, so that the brightness attenuation value of the display block is equal to a preset attenuation value. Low grayscale display can also be called interest-screen display. Then, the brightness attenuation value of the display area is consistent with the brightness attenuation value of other areas. Furthermore, the attenuated brightness values of each display block of the display panel 10 are balanced, and the aging speed of different light-emitting elements 151 is balanced, so as to improve the technical effect of the display panel 10 for image display. The display compensation is applied when the display device 1000 is not in use, that is, when the display device 1000 is in a screen-off state or a power-off state, the display compensation is performed. It can be understood that the user can set a specific time for the display device 1000 to perform compensation, which is not specifically limited in this application.

It can be understood that low-grayscale display or full-screen display means that the display panel emits light without being easily detected by the naked eye of the user, thereby aging the light-emitting element 151 .

In the embodiment of the present application, the time for performing display compensation on the display panel can be confirmed by the user setting a specific time of the non-use period.

In specific embodiments of the present application, for example, a certain display panel may be frequently used for picture drawing or document writing, etc., so the status bar, toolbar, etc. of the user interface of the display panel will display fixed images for a long time.

When the user is using it, each display block of the display panel 10 continues to return working data to the timing control module 40 to indicate its working status. The timing control module 40 obtains the display time according to the received working data and transmits it to The control module 50 performs data processing.

The control module 50 obtains the brightness attenuation value of each display block according to the received display time and brightness attenuation rate Lx. The brightness attenuation value is compared with the preset attenuation value to obtain a brightness attenuation difference. The control module 50 transmits the brightness attenuation difference to the timing control module 40 and the data compensation module 60 .

The data compensation module 60 can also output corresponding compensation data to the driving module 70 according to the received brightness attenuation difference. Further, the driving module 70 performs display compensation on the corresponding display block according to the compensation data.

In the embodiment of the present application, by arranging the control module 50 and the data compensation module 60 in the drive compensation circuit 100, the display time of each display block of the display panel 10 is obtained through the timing control module 40, and then the display time of each display block of the display panel 10 is obtained. The brightness attenuation value of each display area. Moreover, the brightness attenuation difference is used to perform display compensation on some display areas to balance the problem of afterimages in the display screen caused by the different aging speeds of the luminescent materials in different display areas.

Please also refer to FIG. 6 , which is a schematic structural diagram of another driving compensation circuit 200 disclosed in an embodiment of the present application. As shown in Figure 6, in the embodiment of the present application, the difference between the drive compensation circuit 200 and the drive compensation circuit 100 in the previous embodiment is that the drive compensation circuit 200 may also include a system interface circuit 201, a command decoding circuit, and a system interface circuit 201. 202, image data storage module 203, gray scale generator 204, gamma corrector 205 and other components. Specifically, the system interface circuit 201 is used to receive data and commands, and store the received data and commands. The system interface circuit 201 may include a microprocessor (Microprocessor Unit, MPU) interface module and an instruction register module. The microprocessor interface module is used to transmit image display data and commands between the system control and the display screen. The instruction register module The module is electrically connected to the microprocessor interface module and is used to store the data and naming of the image display, which is not specifically limited in this application.

The command decoder 202 , the image data storage module 203 and the timing control module 40 are all electrically connected to the system interface circuit 201 . The command decoder 202 is used to decode commands received by the system interface circuit 201 and convert them into machine language that can be recognized by the display device 1000 . The image data storage module 203 is used to store image data for display.

The gray scale generator 204 is electrically connected to the image data storage module 203 and is used to generate gray scale signals. The gamma corrector 205 is electrically connected to the gray scale generator 204 and the data driving module 71. The gamma corrector 205 is used to correct the gray scale signal and convert the corrected gray scale The signal is transmitted to the data driving module 71 .

Please refer to FIG. 7 , which is a schematic structural diagram of yet another drive compensation circuit 300 disclosed in an embodiment of the present application. As shown in Figure 7, in the embodiment of the present application, the difference between the drive compensation circuit 300 and the drive compensation circuit 200 in the previous embodiment is that the drive compensation circuit 300 may also include an external compensation module 310. The compensation module 310 is electrically connected to the display panel 10 and the data driving module 71 .

The external compensation module 310 is used to obtain the anode voltage of the light-emitting element 151 in the display panel 10 and the current flowing through the light-emitting element 151 . The anode voltage serves as data reflecting the aging degree of the light-emitting element 151 . Specifically, the external compensation module 310 may include an analog-to-digital converter (ADC) and a memory. The anode voltage is stored in the memory after data processing by the analog-to-digital converter. At the same time, the memory also stores the power supply voltage (VDD) and the threshold voltage (Vth) of the driving transistor used to drive the light-emitting element to emit light. The external compensation module 310 calculates the correction value of the image data according to the obtained current, anode voltage, power supply voltage (VDD) and threshold voltage (Vth), and the external compensation module 310 outputs the correction value of the image data to The data driving module 71 corrects some of the sub-pixel units 15 of the display panel 10 according to the correction value.

In this embodiment of the present application, the external compensation module 310 is set up to supplementally compensate part of the sub-pixel units 15 of the display panel 10 to make up for the loss caused by the control module 50 and the data compensation module 60 according to the timing. The control module 40 obtains the display time of different display blocks and the brightness attenuation difference obtained from the pre-stored brightness attenuation rate, and then performs display compensation on some display blocks of the display panel 10 according to the brightness attenuation difference, and then displays There is still a slight uneven aging problem in various areas of the panel 10 .

Please also refer to FIG. 8 , which is a schematic flowchart of a compensation method disclosed in an embodiment of the present application. Based on the same concept, embodiments of the present application also provide a compensation method, which is used for the drive compensation circuit described in any of the above embodiments. The compensation method of the embodiment of the present application involves the content of the drive compensation circuit, Please refer to the relevant description of the driving compensation circuit in the above embodiments, which will not be described again here. The compensation method may at least include the following steps.

Step S10: Obtain the brightness attenuation rates Lx of different luminescent materials corresponding to different initial brightnesses.

Please also refer to FIG. 9 , which is a schematic flowchart of step S10 of the compensation method shown in FIG. 8 . In this embodiment of the present application, step S10 may specifically include the following steps.

Step S11: Determine a plurality of different luminescent materials.

In the embodiment of the present application, the luminescent material in step S11 may be determined according to the luminescent material applied in the display panel 10 , and this application does not impose any specific limitation on this.

In a specific embodiment of the present application, the brightness attenuation rate Lx can be measured for the luminescent materials corresponding to the three sub-pixels R, G, and B.

Step S12: Control each of the luminescent materials to emit light for a preset time corresponding to different initial brightnesses.

In the embodiment of the present application, it can be understood that the greater the driving current adopted for each light-emitting element 151, the higher the luminous brightness will be, and the more severe the brightness attenuation will be. Different initial brightness corresponding to each luminescent material can be achieved by using different driving currents to drive luminescence. Among them, except for the driving current parameter, other test conditions are the same.

In a specific embodiment of the present application, the initial brightness of each luminescent material is selected and controlled to values such as 300 nits (nit), 500 nits, 800 nits, 1200 nits, etc. respectively. Among them, nits is the unit of brightness, which represents the brightness of candlelight per square meter and is used to define the subjective brightness feeling of the observer.

It can be understood that the greater the number of initial brightness values of the luminescent material, the more brightness attenuation values obtained in the test will be obtained, and the higher the accuracy of compensation will be. In addition, the initial brightness may also be determined based on the display panel 10 using more luminous brightness, which is not specifically limited in this application.

In the specific embodiment of this application, the preset time can be selected to be 1000 hours, or other values can be selected according to actual needs. This application does not impose specific restrictions on this.

Step S13: Measure the final brightness of each luminescent material after emitting light for the preset time, and obtain the brightness attenuation rate Lx of different luminescent materials corresponding to different initial brightnesses based on the initial brightness, the final brightness and the preset time. .

In a specific embodiment of the present application, the initial brightness and final brightness of each luminescent material are compared to obtain the brightness attenuation value L, and then according to the preset time, the brightness attenuation rate of different luminescent materials corresponding to different initial luminous brightnesses is obtained. Lx. Wherein, the brightness attenuation rate Lx represents the brightness attenuation value L in unit time.

Step S20: Obtain the display time of each display block of the display panel 10 through the timing control module 40.

In the embodiment of the present application, when the user normally uses the display panel 10 to display images, the timing control module 40 obtains the display time of each display block of the display panel 10 . Specifically, the counting module of the timing control module 40 counts the display time of each display block of the display panel 10 to obtain the display time corresponding to each block.

Step S30: The control module 50 obtains a brightness attenuation difference according to the brightness attenuation rate Lx and the display time of each display block.

Please also refer to FIG. 10 , which is a schematic flowchart of step S30 of the compensation method shown in FIG. 8 .

Step S31: Obtain multiple brightness attenuation values corresponding to different display blocks according to the multiple received display times through the control module 50.

Step S32: Use the control module 50 to obtain a preset attenuation value according to a plurality of brightness attenuation values of the display block corresponding to the display dynamic picture.

In the embodiment of the present application, the preset attenuation value may be an average of multiple brightness attenuation values of the display block corresponding to the dynamic picture, which is not specifically limited in this application.

Step S33: Compare each brightness attenuation value with the preset attenuation value through the control module 50, and obtain multiple brightness attenuation difference values according to the comparison results.

In this embodiment of the present application, the brightness attenuation difference is the difference between the brightness attenuation value and the preset attenuation value.

Step S40: Obtain the compensation data based on the brightness attenuation difference, and perform display compensation on some display blocks of the display panel 10 based on the brightness attenuation difference and the compensation data.

In this embodiment of the present application, when the brightness attenuation difference is a non-negative value, it indicates that the brightness attenuation rate of the display area corresponding to the brightness attenuation difference is relatively low, and no display compensation is required.

In this embodiment of the present application, compensation may refer to performing low-grayscale display on the display area in which the brightness attenuation difference is negative, which may also be referred to as screen-flat display. Then, the brightness attenuation value of the display area is consistent with the brightness attenuation value of other areas. Furthermore, the attenuated brightness values of each display block of the display panel 10 are balanced, and the aging speed of different luminescent materials is balanced, so as to improve the technical effect of the display panel 10 for image display.

It can be understood that low grayscale display or screen display refers to making the display panel emit light without being easily detected by the naked eye of the user.

Based on the same concept, an embodiment of the present application also provides a display device 1000. The display device 1000 includes a display panel 10 and the drive compensation circuit described in any of the previous embodiments. The driving compensation circuit is used to perform display compensation on the display panel 10 .

As shown in FIG. 3 , the display device 1000 may further include a power module 20 and a support frame 30 . The display panel 10 is fixed to the support frame 30 , and the power module 20 is disposed on the display panel 10 . back. The display panel 10 is used to display images. The power module 20 is electrically connected to the display panel 10 and is used to provide power supply voltage for the display panel 10 to display images. The support frame 30 is the display panel. 10 and the power module 20 provide support and protection.

It can be understood that the display device provided by the embodiment of the present application can be a laptop computer display screen, a liquid crystal display, an LCD TV, a mobile phone, a tablet computer, or any other product or component with a display function.

In one embodiment, the display device 1000 also includes other necessary components and components such as a power board, a high voltage board, a key control board, etc. Those skilled in the art can make corresponding adjustments based on the specific type and actual functions of the display device 1000. Supplementary information will not be repeated here.

It can be understood that the display device 1000 can also be used for electronic devices including functions such as personal digital assistant (Personal Digital Assistant, PDA) and/or music player, such as mobile phones, tablet computers, and wearable electronic devices with wireless communication functions. (Such as smart watches) etc. The above-mentioned electronic device may also be other electronic devices, such as a laptop computer (Laptop) with a touch-sensitive surface (such as a touch panel).

To sum up, in the drive compensation circuit, compensation method and display device 1000 provided by this application, the control module 50 and the data compensation module 60 are provided in the drive compensation circuit 100, and each display is obtained through the timing control module 40. The display time of the block is used to obtain the brightness attenuation value of each display block and the brightness attenuation difference value of each display block. Furthermore, the brightness attenuation difference is used to perform display compensation on some display blocks to balance the problem of residual images in the display screen caused by the different aging speeds of the luminescent materials in different display blocks, thereby improving the service life of the display panel 10 . The display effect and display quality of the display device 1000 are effectively improved. Furthermore, the display effect and service life of the display device 1000 are also effectively improved. Moreover, it also overcomes the problem of increased manufacturing costs caused by increasing the sub-pixel area in the prior art to overcome the residual image of the display screen. Therefore, the technical solution of this application adjusts the R, G, and B luminescence by confirming the attenuation speed of different light-emitting elements. The component keeps its attenuation rate and aging speed as consistent as possible to avoid image afterimage problems caused by different attenuation rates and aging speeds, and the manufacturing cost is also low.

The flow chart described in this application is only an embodiment, and various modifications and changes may be made to this illustration or the steps in this application without departing from the spirit of this application. For example, the steps can be performed in a different order, or certain steps can be added, deleted, or modified. Those of ordinary skill in the art can understand that all or part of the processes for implementing the above embodiments, and equivalent changes made in accordance with the claims of this application, still fall within the scope of the invention.

In the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" is intended to be in conjunction with the described implementation. A specific feature, structure, material, or characteristic described in a manner or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. All possible combinations of each technical feature in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-described embodiments only express several implementation modes of the present application, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be noted that, for those of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all fall within the protection scope of the present application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

A driving compensation circuit includes a timing control module and a driving module that are electrically connected to a display panel. The timing control module drives the driving module to control the display panel to display images, wherein the driving compensation circuit It also includes a control module and a data compensation module, the control module is electrically connected to the timing control module and the data compensation module, and the data compensation module is also electrically connected to the driving module;

The timing control module obtains the display times of multiple display blocks of the display panel, and transmits the multiple display times to the control module; the control module determines the display times according to the multiple display times. Obtain multiple brightness attenuation difference values, and transmit the brightness attenuation difference values to the timing control module and the data compensation module; the data compensation module obtains compensation data based on the multiple brightness attenuation difference values, and transmit the compensation data to the driving module;

When the display panel is in an unused state, the driving module performs display compensation on part of the display blocks of the display panel according to the compensation data.
The drive compensation circuit of claim 1, wherein the control module pre-stores brightness attenuation rates of different luminescent materials corresponding to different initial luminous luminances, and the control module is configured to adjust the brightness attenuation rate and the The display time is used to obtain the brightness attenuation value of each block corresponding to the display time; the control module is also used to obtain a preset attenuation value based on the plurality of brightness attenuation values corresponding to the display block of the display panel displaying the dynamic picture. , and compare each brightness attenuation value with the preset attenuation value, and obtain multiple brightness attenuation difference values according to the comparison results, wherein the brightness attenuation difference values include information characterizing the compensation time and compensation brightness. .
The drive compensation circuit of claim 2, wherein the preset attenuation value is an average of a plurality of brightness attenuation values corresponding to the display block displaying the dynamic image.
The drive compensation circuit of claim 2, wherein when the absolute value of the brightness attenuation value is greater than the absolute value of the preset attenuation value, the brightness attenuation difference is a negative value, and the control module will The brightness attenuation difference is transmitted to the data compensation module and the timing control module;

When the absolute value of the brightness attenuation value is less than or equal to the absolute value of the preset attenuation value, the brightness attenuation difference is a non-negative value, indicating that there is no need to modify the display panel corresponding to the brightness attenuation difference. Display block performs display compensation.
The drive compensation circuit of claim 1, wherein the drive module includes a data drive module and a scan drive module, and the data drive module and the scan drive module are connected to the timing control module and the data compensation module. The module is electrically connected to the display panel, and the timing control module drives the scan drive module to scan the corresponding display area according to the brightness attenuation difference; the timing control module controls the display according to the brightness attenuation difference. The data driving module transmits the power signal to the corresponding display block according to the compensation data, and then performs display compensation on the corresponding display block of the display panel.
The driving compensation circuit of claim 5, wherein the driving compensation circuit further includes an external compensation module, the external compensation module is electrically connected to the display panel and the data driving module, wherein the external compensation module The compensation module stores the power supply voltage and the threshold voltage of the transistor used to drive the light-emitting element to emit light;

The external compensation module is used to obtain the anode voltage of the light-emitting element of the display panel and the current flowing through the light-emitting element, and is used to calculate based on the obtained current, the anode voltage, the power supply voltage and the threshold voltage. A correction value of the image data is obtained, and the correction value is transmitted to the data driving module. The data driving module corrects some sub-pixel units of the display panel according to the correction value.
The driving compensation circuit of claim 2, wherein the display compensation refers to controlling the display area of the display panel to perform low grayscale display, so that the brightness attenuation value of the display area is equal to the Default attenuation value.
A compensation method for the drive compensation circuit as claimed in claim 1, wherein the compensation method includes:

Obtain the brightness decay rate of different luminescent materials corresponding to different initial brightness;

Obtain the display time of each display block of the display panel through the timing control module;

The brightness attenuation difference is obtained by the control module according to the brightness attenuation rate and the display time of each display block;

Compensation data is obtained according to the brightness attenuation difference value, and display compensation is performed on part of the display blocks of the display panel according to the brightness attenuation difference value and the compensation data.
The compensation method according to claim 8, wherein said obtaining the brightness attenuation rates of different luminescent materials corresponding to different initial brightnesses includes:

Determining a plurality of different said luminescent materials;

Control each of the luminescent materials to emit light for a preset time corresponding to different initial brightnesses;

The final brightness of each luminescent material after emitting light for the preset time is measured, and all the values of the different initial luminances corresponding to the different luminescent materials are obtained based on the initial brightness, the final brightness and the preset time. The brightness attenuation rate.
The compensation method according to claim 8, wherein the control module obtains the brightness attenuation difference according to the brightness attenuation rate and the display time of each display block, including:

Obtain multiple brightness attenuation values corresponding to different display blocks according to the multiple received display times through the control module;

Obtain a preset attenuation value through the control module according to the plurality of brightness attenuation values corresponding to the display block displaying the dynamic picture;

The control module compares each brightness attenuation value with the preset attenuation value, and obtains a plurality of brightness attenuation difference values according to the comparison results.
The compensation method of claim 8, wherein the control module pre-stores brightness attenuation rates of different luminescent materials corresponding to different initial luminous luminances, and the luminance attenuation difference includes information representing compensation time and compensation brightness.
The compensation method according to claim 8, wherein the display compensation refers to controlling the display area of the display panel to perform low grayscale display so that the brightness attenuation value of the display area is equal to the preset value. Set the attenuation value.
The compensation method according to claim 10, wherein the preset attenuation value is an average of a plurality of brightness attenuation values corresponding to the display block displaying the dynamic picture.
A display device, wherein the display device includes a display panel and a drive compensation circuit, the drive compensation circuit is used to perform display compensation on the display panel, wherein the drive compensation circuit includes a drive compensation circuit that is electrically connected to the display panel. The timing control module and the driving module are electrically connected, and the timing control module drives the driving module to control the display panel to display the picture, wherein the driving compensation circuit also includes a control module and a data compensation module, so The control module is electrically connected to the timing control module and the data compensation module, and the data compensation module is also electrically connected to the driving module;

The timing control module obtains the display times of multiple display blocks of the display panel, and transmits the multiple display times to the control module; the control module determines the display times according to the multiple display times. Obtain multiple brightness attenuation difference values, and transmit the brightness attenuation difference values to the timing control module and the data compensation module; the data compensation module obtains compensation data based on the multiple brightness attenuation difference values, and transmit the compensation data to the driving module;

When the display panel is in an unused state, the driving module performs display compensation on part of the display blocks of the display panel according to the compensation data.
The display device of claim 14, wherein the control module pre-stores brightness attenuation rates of different luminescent materials corresponding to different initial luminous luminances, and the control module is configured to adjust the brightness attenuation rate and the display according to the brightness attenuation rate and the display device. time to obtain the brightness attenuation value of each block corresponding to the display time; the control module is also used to obtain a preset attenuation value based on a plurality of the brightness attenuation values corresponding to the display block of the display panel displaying the dynamic picture, Each of the brightness attenuation values is compared with the preset attenuation value, and a plurality of the brightness attenuation difference values are obtained according to the comparison results, where the brightness attenuation difference values include information representing the compensation time and the compensation brightness.
The display device of claim 15, wherein the preset attenuation value is an average of a plurality of brightness attenuation values corresponding to the display block displaying the dynamic image.
The display device of claim 15, wherein when the absolute value of the brightness attenuation value is greater than the absolute value of the preset attenuation value, the brightness attenuation difference is a negative value, and the control module The brightness attenuation difference is transmitted to the data compensation module and the timing control module;

When the absolute value of the brightness attenuation value is less than or equal to the absolute value of the preset attenuation value, the brightness attenuation difference is a non-negative value, indicating that there is no need to modify the display panel corresponding to the brightness attenuation difference. Display block performs display compensation.
The display device of claim 14, wherein the driving module includes a data driving module and a scan driving module, and the data driving module and the scanning driving module are connected with the timing control module, the data compensation module The group is electrically connected to the display panel, and the timing control module drives the scan driving module to scan the corresponding display block according to the brightness attenuation difference; the timing control module controls the corresponding display area according to the brightness attenuation difference. The data driving module transmits the power signal to the corresponding display block according to the compensation data, and then performs display compensation on the corresponding display block of the display panel.
The display device according to claim 18, wherein the driving compensation circuit further includes an external compensation module, the external compensation module is electrically connected to the display panel and the data driving module, wherein the external compensation module The module stores a power supply voltage and a threshold voltage of a transistor used to drive the light-emitting element to emit light;

The external compensation module is used to obtain the anode voltage of the light-emitting element of the display panel and the current flowing through the light-emitting element, and is used to calculate based on the obtained current, the anode voltage, the power supply voltage and the threshold voltage. A correction value of the image data is obtained, and the correction value is transmitted to the data driving module. The data driving module corrects some sub-pixel units of the display panel according to the correction value.
The display device of claim 15, wherein the display compensation refers to controlling a display block of the display panel to perform low grayscale display so that the brightness attenuation value of the display block is equal to the preset value. Set the attenuation value.