CN115223501A

CN115223501A - Drive compensation circuit, compensation method and display device

Info

Publication number: CN115223501A
Application number: CN202211000964.7A
Authority: CN
Inventors: 黄佩迪; 郑浩旋
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-10-21
Anticipated expiration: 2042-08-19
Also published as: CN115223501B; WO2024036864A1

Abstract

The application relates to a driving compensation circuit, a compensation method and a display device. The driving compensation circuit comprises a time sequence control module, a driving module, a control module and a data compensation module which are electrically connected with the display panel. The time sequence control module acquires the display time of a plurality of display blocks of the display panel and transmits the display time to the control module. The control module obtains a brightness attenuation difference value according to the display time and transmits the brightness attenuation difference value to the time sequence control module and the data compensation module. The data compensation module obtains compensation data according to the brightness attenuation difference value and transmits the compensation data to the driving module. And the time sequence control module controls the driving module to perform display compensation on part of the display blocks of the display panel in an unused state according to the compensation data according to the brightness attenuation difference value. In the driving compensation circuit of the application, the control module and the data compensation module are arranged to obtain the brightness attenuation difference value so as to compensate the display of part of the display blocks, so that the problem that the display pictures have residual images due to different aging speeds of different luminescent materials is solved.

Description

Drive compensation circuit, compensation method and display device

Technical Field

The present disclosure relates to the field of display technologies, 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

With the development of display technology and the updating of screens in the photoelectric display industry, organic Light-Emitting Diode (OLED) display screens gradually enter the public field of vision, and OLED display screens are more and more commonly applied by virtue of the advantages of no need of backlight, good flexibility, wide viewing angle, uniform image quality, high response speed, rich colors and the like, and are most remarkable in products such as mobile phones, media players, small-sized entry-level televisions and the like. The OLED display screen utilizes current to trigger a self-luminous element to emit light, and the organic semiconductor material and the luminous material are driven by an electric field to emit light after being injected and compounded by current carriers without using a backlight plate.

However, since the self-attenuation rates of different self-luminous element materials are different, the aging of different self-luminous elements under the same current after being used for a long time is not consistent, so that the brightness of part of the self-luminous elements is not enough, and the problem of image sticking of a display screen is easily caused.

Disclosure of Invention

In view of the shortcomings of the prior art, the present application aims to provide a driving compensation circuit, a compensation method and a display device. And arranging a control module and a data compensation module in the driving compensation circuit to obtain the brightness attenuation difference of each display block. And then, the brightness attenuation difference value is utilized to perform display compensation on part of the display blocks so as to balance the problem of residual images of display pictures caused by different aging speeds of the luminescent materials of different display blocks, and the display effect and the display taste of the display device are effectively improved.

In a first aspect, the present application provides a driving compensation circuit, which includes a timing control module and a driving module electrically connected to a display panel, wherein the timing control module drives the driving module to control the display panel to display images. The driving compensation circuit further comprises a control module and a data compensation module, the control module is electrically connected with the time sequence control module and the data compensation module, and the data compensation module is also electrically connected with the driving module;

the time sequence control module acquires the display time of a plurality of display blocks of the display panel and transmits the display time to the control module; the control module obtains a plurality of brightness attenuation difference values according to the display time, and transmits the brightness attenuation difference values to the time sequence control module and the data compensation module; the data compensation module obtains compensation data according to the brightness attenuation difference values and transmits the compensation data to the driving module;

and the time sequence control module controls the driving module to perform display compensation on part of display blocks of the display panel in an unused state according to the compensation data according to the brightness attenuation difference value.

In some embodiments, the control module stores brightness attenuation rates of different luminescent materials corresponding to different initial luminescent brightness in advance, and the control module is configured to obtain a brightness attenuation value corresponding to display time of each block according to the brightness attenuation rates and the display time; the control module is further configured to obtain a preset attenuation value according to a plurality of brightness attenuation values corresponding to a display block of a dynamic picture displayed by the display panel, compare each brightness attenuation value with the preset attenuation value, and obtain a plurality of brightness attenuation difference values according to a comparison result, where the brightness attenuation difference values include information representing compensation time and compensation brightness.

In some embodiments, the preset attenuation value is an average value of a plurality of luminance attenuation values corresponding to a display area displaying a dynamic picture.

In some embodiments, when the absolute value of the brightness attenuation value is greater than the absolute value of the preset attenuation value, the brightness attenuation difference value is a negative value, and the control module transmits the brightness attenuation difference value to the data compensation module and the timing control module;

when the absolute value of the brightness attenuation value is smaller than or equal to the absolute value of the preset attenuation value, the brightness attenuation difference value is a non-negative value, and the display compensation of the display area of the display panel corresponding to the brightness attenuation difference value is not required.

In some embodiments, the driving module includes a data driving module and a scan driving module, both of which are electrically connected to the timing control module, the data compensation module and 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; and the time sequence control module controls the data driving module to transmit power signals to corresponding display blocks according to the compensation data according to the brightness attenuation difference value, and further performs display compensation on the corresponding display blocks of the display panel.

In some embodiments, the driving compensation circuit further includes an external compensation module electrically connected to the display panel and the data driving module, wherein the external compensation module stores a power voltage and a threshold voltage of a transistor for driving the light emitting element to emit light;

the external compensation module is used for acquiring anode voltage of a light emitting element of the display panel and current flowing through the light emitting element, calculating a correction value of image data according to the acquired current, the anode voltage, the power supply voltage and the threshold voltage, and transmitting the correction value to the data driving module, and the data driving module corrects part of sub-pixel units of the display panel according to the correction value.

In some embodiments, the display compensation refers to controlling a display area of the display panel to perform low gray scale display such that a brightness attenuation value of the display area is equal to a preset attenuation value.

In a second aspect, the present application further provides a compensation method, including:

obtaining brightness attenuation rates of different luminescent materials corresponding to different initial brightness;

acquiring the display time of each display block of the display panel through a time sequence control module;

obtaining a brightness attenuation difference value according to the brightness attenuation rate and the display time of each display block through a control module;

and obtaining compensation data according to the brightness attenuation difference value, and performing display compensation on part of display blocks of the display panel according to the brightness attenuation difference value and the compensation data.

In some embodiments, the obtaining the luminance decay rate of different luminescent materials corresponding to different initial luminance includes:

determining a plurality of different said luminescent materials;

controlling each luminescent material to emit light for preset time corresponding to different initial brightness;

and measuring the final brightness of each luminescent material after the luminescent material emits light for the preset time, and obtaining the brightness attenuation rate of different luminescent materials corresponding to different initial brightness according to the initial brightness, the final brightness and the preset time.

In some embodiments, the obtaining, by the control module, a brightness attenuation difference value according to the brightness attenuation rate and the display time of each display block includes:

acquiring a plurality of brightness attenuation values corresponding to different display blocks according to the received display time through the control module;

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

and comparing each brightness attenuation value with the preset attenuation value through the control module, and obtaining a plurality of brightness attenuation difference values according to the comparison result.

In a third aspect, the present application further provides a display device, where the display device includes a display panel and the above-mentioned driving compensation circuit, and the driving compensation circuit is configured to perform display compensation on the display panel.

In summary, in the driving compensation circuit, the compensation method and the display device of the present application, in the driving compensation circuit, the compensation method and the display device provided in the present application, the control module and the data compensation module are disposed in the driving compensation circuit, and the display time of each display block is obtained through the timing control module, so as to obtain the brightness attenuation value of each display block and the brightness attenuation difference value of each display block. And then, the brightness attenuation difference value is utilized to perform display compensation on part of the display blocks so as to balance the problem of image retention of a display picture caused by different aging speeds of the luminescent materials of different display blocks, and the service life of the display panel is prolonged. The display effect and the display taste of the display device are effectively improved. Further, the display effect and the service life of the display device are effectively improved. In addition, the problem of increased manufacturing cost caused by the fact that the area of a sub-pixel is increased to overcome the display image retention in the prior art is also solved, therefore, the technical scheme of the application adjusts the attenuation rates and the aging rates of the R, G and B light-emitting elements to be consistent as much as possible by confirming the attenuation rates of different light-emitting elements, thereby avoiding the image retention problem caused by different attenuation rates and aging rates, and the manufacturing cost is lower.

Drawings

Fig. 1 is a schematic view of a light-emitting element disclosed in an embodiment of the present application;

FIG. 2 is a graph showing the decay of the emission luminance of the light-emitting element shown in FIG. 1 with time and the change in cathode voltage;

fig. 3 is a schematic structural diagram of a display device according to an embodiment of the present disclosure;

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

fig. 5 is a functional structure diagram of a driving compensation circuit according to an embodiment of the disclosure;

FIG. 6 is a schematic diagram of another driving compensation circuit according to an embodiment of the disclosure;

FIG. 7 is a schematic structural diagram of another driving compensation circuit disclosed in the embodiments of the present application;

FIG. 8 is a schematic flow chart diagram illustrating a compensation method according to an embodiment of the present disclosure;

FIG. 9 is a flowchart illustrating step S10 of the compensation method shown in FIG. 8;

fig. 10 is a flowchart illustrating step S30 of the compensation method shown in fig. 8.

Description of the reference numerals: 1000-a display device; 10-a display panel; 15-a sub-pixel unit; 151-a light emitting element; 20-a power module; 100. 200, 300-drive compensation circuit; 30-a support frame; 40-a timing control module; 50-a control module; 60-a data compensation module; 70-a drive module; 71-a data driving module; 72-a scan drive module; 201-system interface circuitry; 202-a command decoder; 203-image data storage module; 204-a gray scale generator; 205-a gamma corrector; 310-an external compensation module; f1-a first direction; f2-a second direction; S1-Sn-scan line; D1-Dm-data line; t1-a first transistor; t2 — a second transistor; cg-storage capacitance; S10-S40-steps of a compensation method; S11-S13-step of S10 in the compensation method; S31-S33-step of S30 in the compensation method.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. The ordinal numbers used herein for the components, such as "first," "second," etc., are used merely to distinguish between the objects described, and do not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). Directional phrases referred to in this application, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer to the orientation of the appended drawings and are therefore used in a better and clearer sense of description and understanding of the present application, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. It should be noted that the terms "step 1", "step 2", etc. in the description and claims of the present application and the drawings are used for distinguishing different objects and not for describing a specific order. The terms "first," "second," and the like in the description and claims of the present application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprises," "comprising," "includes," "including," or "including," when used in this application, specify the presence of stated features, operations, elements, and/or the like, but do not limit one or more other features, operations, elements, and/or the like. Furthermore, the terms "comprises" or "comprising" indicate the presence of the respective features, numbers, steps, operations, elements, components or combinations thereof disclosed in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof, and are intended to cover non-exclusive inclusions. It is also to be understood that the term "at least one" as used herein means one and more than one, such as one, two or three, etc., and the term "plurality" means at least two, such as two or three, etc., unless specifically limited otherwise.

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

Referring to fig. 1, fig. 1 is a schematic diagram of a light emitting device according to an embodiment of the disclosure. As shown in fig. 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, which are sequentially stacked. In the embodiment of the present application, the Light Emitting element may be an Organic Light-Emitting Diode (OLED).

It is understood that the light emission of the organic light emitting diode is mainly driven by an electric field, and the organic semiconductor material and the light emitting material emit light by carrier injection and recombination. In the embodiment of the present application, an Indium Tin Oxide (ITO) glass transparent electrode is used as an anode of the organic light emitting diode, and a metal electrode is used as a cathode of the organic light emitting diode. The cathode of the organic light emitting diode is electrically connected to the cathode of the power supply, and the anode of the organic light emitting diode is electrically connected to the anode of the power supply. The organic light emitting diode is driven by a power supply to transmit electrons from a cathode of the organic light emitting diode to a light emitting layer through an electron transport layer, and holes are injected from an anode of the organic light emitting diode to the light emitting layer through a hole injection layer and a hole transport layer. Then, the electrons and the holes meet at the luminescent layer to generate excitons, so that luminescent molecules are excited, and a light source is generated after radiation.

Referring to fig. 2, fig. 2 is a graph showing the luminance decay of the light-emitting device shown in fig. 1 with time and the cathode voltage. As shown in fig. 2, the axis of abscissa indicates time, the axis of ordinate indicates the cathode voltage of the light emitting element, and the axis of ordinate indicates the luminance of the light emitting element. The two curves in the figure are obtained with a constant current from the power supply to the light-emitting element.

The light emitting element is a self-luminous element, and has a layer of organic compound film on its surface. As can be seen from the graph, the cathode voltage of the light emitting element gradually increases and the luminance gradually decreases with time, and this phenomenon that the luminance gradually decreases with time is caused by the attenuation. Therefore, when a display panel manufactured by using such a light emitting element is used, a part of a display screen is similar to a fixed screen, and when a fixed area on a screen always displays the fixed screen for a long time, the attenuation speed of the light emitting material of the light emitting element corresponding to the part of the area exceeds that of the other dynamic screen, and the aging speed of the light emitting material is increased accordingly. When the material is attenuated, the luminous efficiency is low, and the display brightness of the material is reduced under the same driving current; after a period of time afterimages will appear.

Therefore, the luminous efficiency of the light emitting elements in the corresponding area of the fixed picture is reduced, the luminance of the part of the light emitting elements is gradually reduced under the same current driving as before, and after a while, afterimages appear, thereby affecting the display effect and the taste.

It is understood that the luminance decay of the light emitting element is also caused by other factors such as temperature.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a display device 1000 according to an embodiment of the present disclosure. As shown in fig. 3, the display device 1000 provided in the embodiment of the present application at least includes a display panel 10, a power module 20 and a supporting frame 30, wherein the display panel 10 is fixed to the supporting frame 30, and the power module 20 is disposed on a back surface of the display panel 10, that is, a non-display surface of the display panel 10, that is, a side of the display panel 10 facing away from a user. The display panel 10 is used for displaying images, the power module 20 is electrically connected with the display panel 10 and used for providing power voltage for displaying images on the display panel 10, and the supporting frame 30 provides supporting and protecting effects for the display panel 10 and the power module 20.

It is understood that the display panel 10 further has a display surface disposed opposite to the non-display surface, i.e. the front surface of the display panel 10, i.e. the side of the display panel 10 facing the user. The display surface is used to face a user using the display apparatus 1000 to display an image.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a 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 to Sn (Scan lines) extending along a first direction F1 and a plurality of Data lines D1 to Dm (Data lines) extending along a second direction F2, which are arranged in a grid pattern. The first direction F1 and the second direction F2 are perpendicular to each other, and the plurality of scanning lines S1-Sn, the plurality of data lines D1-Dm, and 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, the plurality of data lines D1-Dm are arranged at intervals along the first direction F1 and are insulated from each other, and the plurality of scan lines S1-Sn and the plurality of data lines D1-Dm are insulated from each other.

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

In the 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 serving as a switch for addressing, and the second transistor T2 serving to supply a driving current to the light emitting element 151. The storage capacitor Cg is used to store an input image data voltage.

When the display panel 10 displays, a scanning signal at a second potential is sequentially applied to each row of scanning lines to turn on the first transistor T1, and a Data signal Data on a 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 magnitude of current flowing through the light emitting element 151.

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

In an exemplary embodiment, when a scan signal of a low level is applied to a scan line of a 1 st row, the first transistor T1 is turned on, and a data signal on a 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 realize current control over the light emitting element 151. When the scan line of row 1 applies a high-level scan signal, the first transistor T1 is turned on, and the voltage of the storage capacitor Cg is used to maintain the second transistor T2 to operate, so as to keep the light-emitting element 151 emitting light continuously until the next scan period.

Referring to fig. 5, fig. 5 is a functional structure diagram of a driving compensation circuit 100 according to an embodiment of the present disclosure. As shown in fig. 5, the present application provides a driving compensation circuit 100, the driving compensation circuit 100 including:

the timing control module 40 is electrically connected to the display panel 10, and is configured to obtain display time of a plurality of 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 a plurality of display times to the control module 50. The control module 50 obtains a plurality of corresponding brightness attenuation differences according to the received display times. Wherein the brightness decay difference value contains information characterizing 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 further transmits the brightness attenuation difference values to the data compensation module 60. The data compensation module 60 is configured to obtain corresponding compensation data according to the received brightness attenuation differences.

And a driving module 70 electrically connected to the timing control module 40, the data compensation module 60 and the display panel 10, wherein the data compensation module 60 obtains compensation data according to the received brightness attenuation differences, and transmits 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 display compensation on the corresponding display block according to the compensation data when the display panel 10 is in an unused state (i.e., in a screen-off state or a power-off state).

In the 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 both the timing control module 40 and the display panel 10, and the timing control module 40 drives the driving module 70 to control the display panel 10 to display images. The driving compensation circuit 100 further includes a control module 50 and a data compensation module 60, the control module 50 is electrically connected to the timing control module 40, the data compensation module 60 is electrically connected to the control module 50 and the driving module 70, and the timing control module 40 is further electrically connected to the display panel 10.

The timing control module 40 is configured to obtain display times of a plurality of display blocks of the display panel 10 and transmit the display times to the control module 50;

the control module 50 obtains a plurality of brightness attenuation difference values according to a plurality of received display times, wherein the brightness attenuation difference values include information representing compensation time and compensation brightness, and the control module 50 transmits the brightness attenuation difference values to the sequential control module 40 and the data compensation module 60;

the data compensation module 60 is configured to obtain compensation data according to the received brightness attenuation differences, and transmit the compensation data to the driving module 70.

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

In the embodiment of the present application, the display panel 10 is divided into a plurality of display blocks, and each display block includes a plurality of sub-pixel units 15. Accordingly, each display block correspondingly comprises a plurality of light emitting elements 151 equal to or multiple of the sub-pixel units 15.

In the process of displaying the image by the display panel 10, 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.

The specific implementation is illustrated by taking the screen resolution of the display panel 10 as 1920 × 1080. In the embodiment of the present application, the display panel 10 may be divided into 10 display blocks, and the number of the sub-pixel units 15 of each display block is 192 × 108. Accordingly, each display region may include 192 × 108 light emitting elements 151. In the process of displaying images by using the display panel 10, 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 the embodiment of the present application, the timing control module 40 may be a timing controller (T-CON), which is not specifically limited in the present application.

In the embodiment of the present application, the control module 50 stores the luminance decay rate Lx of different luminescent materials corresponding to different initial luminance in advance. Wherein the luminance decay rate is a luminance decay rate of the light emitting material per unit time.

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

Since the brightness attenuation speed of the display block corresponding to the display fixed frame is faster than that of the display block corresponding to the display dynamic frame, the control module 50 obtains the preset attenuation value according to the brightness attenuation values of the display blocks corresponding to the display dynamic frame. The preset attenuation value may be an average value of a plurality of brightness attenuation values corresponding to a display block displaying a dynamic picture, which is not limited in the present application.

In the embodiment of the present application, the preset attenuation value is obtained only according to the luminance attenuation value of the display block displaying the dynamic picture, and since the absolute value of the luminance attenuation value of the display block displaying the dynamic picture is small, the absolute value of the preset attenuation value obtained according to the preset attenuation value is smaller. Furthermore, the obtained preset attenuation value level is higher, the efficiency of obtaining the preset attenuation value is improved, and meanwhile, more display blocks with unbalanced brightness attenuation values are compensated, so that the uniformity of the brightness attenuation values of the display blocks of the display panel is higher, and the display effect is improved.

For example, if a display panel 10 is divided into 5 blocks, the luminance attenuation value of each block is 1%,1.2%,1.3%, 2.1%. Wherein, 1%,1.2% and 1.3% are the luminance attenuation values of the corresponding display areas displaying the dynamic image, and 2.1% are the luminance attenuation values of the corresponding display areas displaying the static image.

If the preset attenuation value obtained by directly averaging the brightness attenuation values (i.e., 1%,1.2%,1.3%, 2.1%) of all the display areas of the display panel 10 is 1.54%, the display compensation needs to be performed on the display areas with the brightness attenuation values of 2.1% and 2.1%, so that the compensation value of the corresponding display area 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 corresponding display blocks of the display motion picture is 1.16%, the display compensation needs to be performed on the display blocks with the brightness attenuation values of 1.2%,1.3%,2.1%, and 2.1%, so that the compensation value of the corresponding display block is equal to 1.16%. After compensation, the brightness attenuation values of the display panel are 1%,1.16%,1.16%,1.16% and 1.16%.

As can be seen from the compensated brightness attenuation values, the brightness attenuation values of the display blocks corresponding to the dynamic display frames are averaged to obtain a preset attenuation value, and then the display compensation is performed on the display blocks of the display panel 10, so that the brightness attenuation degree of the obtained display panel is more uniform. Further, the display effect of the display panel 10 is further improved.

The control module 50 is further configured 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 values are the difference values between the brightness attenuation values and the preset attenuation values.

And when the absolute value of the brightness attenuation value is larger than the absolute value of the preset attenuation value, the brightness attenuation difference value is a negative value. And 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 value 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, where 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, the display block of the display panel 10 corresponding to the brightness attenuation difference does not need to be compensated for.

In the 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 the 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 scan driving module 72 are electrically connected to the timing control module 40, the data compensation module 60 and the display panel 10, respectively.

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 controls the data driving module 71 to transmit the power signal to the corresponding display block according to the compensation data according to the compensation brightness included in the brightness attenuation difference, so as to perform display compensation on the corresponding display block of the display panel 10.

In the embodiment of the present application, the display compensation may refer to performing low gray level display on the display block with the negative brightness attenuation difference value, so that the brightness attenuation value of the display block is equal to a preset attenuation value. The low gray scale display may also be referred to as a raster display. And the brightness attenuation value of the display block is consistent with the brightness attenuation values of other areas. Further, the attenuation luminance values of the display blocks of the display panel 10 are balanced, and the aging speed of the different light emitting elements 151 is balanced, so as to improve the technical effect of the display panel 10 on displaying images. The display compensation is applied when the display device 1000 is in an unused state, that is, when the display device 1000 is in a screen-off state or a power-off state, the display compensation is performed. It is understood that the user can set a specific time for the display device 1000 to compensate, which is not limited in this application.

It is understood that the low gray scale display or the breath screen display means that the display panel is caused to emit light in a state that cannot be easily found by the naked eye of a user, thereby aging the light emitting element 151.

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

In the embodiment of the present application, for example, a certain display panel may be frequently used for drawing pictures or writing documents, and the status bar, the toolbar, and the like of the use interface of the display panel all display fixed pictures for a long time.

When a user uses the display panel 10, each display block of the display panel continuously transmits back working data to the timing control module 40 to represent the working state of the display panel, and the timing control module 40 obtains display time according to the received working data and transmits the display time to the control module 50 for data processing.

The control module 50 obtains the brightness attenuation value of each display block according to the received display time and the brightness attenuation rate Lx. And comparing the brightness attenuation value with the preset attenuation value to obtain a brightness attenuation difference value. 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 may further 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 providing the control module 50 and the data compensation module 60 in the driving 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 brightness attenuation value of each display block is obtained. And the brightness attenuation difference is used for carrying out display compensation on partial display blocks so as to balance the problem of residual images of the display picture caused by different aging speeds of the luminescent materials of different display blocks.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another driving compensation circuit 200 according to an embodiment of the disclosure. As shown in fig. 6, in the embodiment of the present application, the driving compensation circuit 200 is different from the driving compensation circuit 100 in the previous embodiment in that the driving compensation circuit 200 may further include a system interface circuit 201, a command decoder 202, an image data storage module 203, a gray scale generator 204, a gamma (gamma) corrector 205, and the like. Specifically, the system interface circuit 201 is configured to receive data and commands and store the received data and commands. The system interface circuit 201 may include a Microprocessor Unit (MPU) interface module and an instruction register module, where the Microprocessor interface module is configured to transmit image display data and commands between a system control and a display screen, and the instruction register module is electrically connected to the Microprocessor interface module and is configured to store the image display data and names, which is not 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 configured to decode the command received by the system interface circuit 201, and convert the command into a machine language recognizable by the display apparatus 1000. The image data storage module 203 is used for storing image data for display.

The gray scale generator 204 is electrically connected to the image data storage module 203, and is configured to generate a gray scale signal. The gamma corrector 205 is electrically connected to the gray scale generator 204 and the data driving module 71, and the gamma corrector 205 is configured to correct gray scale signals and transmit the corrected gray scale signals to the data driving module 71.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another driving compensation circuit 300 according to an embodiment of the disclosure. As shown in fig. 7, in the embodiment of the present application, the difference between the driving compensation circuit 300 and the driving compensation circuit 200 in the previous embodiment is that the driving compensation circuit 300 may further include an external compensation module 310, and the external compensation module 310 is electrically connected to both the display panel 10 and the data driving module 71.

The external compensation module 310 is used for obtaining the anode voltage of the light emitting element 151 in the display panel 10 and the current flowing through the light emitting element 151, wherein the anode voltage is used 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, and the anode voltage is stored in the memory after being processed by the ADC. Meanwhile, the memory also stores a power supply Voltage (VDD) and a threshold voltage (Vth) of a driving transistor for driving the light emitting element to emit light. The external compensation module 310 calculates a correction value of the image data according to the obtained current, the anode voltage, the power Voltage (VDD) and the threshold voltage (Vth), the external compensation module 310 outputs the correction value of the image data to the data driving module 71, and the data driving module 71 corrects a part of the sub-pixel units 15 of the display panel 10 according to the correction value.

In this embodiment of the application, the external compensation module 310 is configured to perform compensation on part of the sub-pixel units 15 of the display panel 10, so as to make up for a brightness attenuation difference obtained by the control module 50 and the data compensation module 60 according to the display time of different display blocks acquired by the timing control module 40 and a pre-stored brightness attenuation rate, and further, after performing display compensation on part of the display blocks of the display panel 10 according to the brightness attenuation difference, the problem that the small-amplitude aging degree of each block of the display panel 10 is still uneven still exists.

Referring to fig. 8, fig. 8 is a schematic flow chart illustrating a compensation method according to an embodiment of the present disclosure. Based on the same concept, an embodiment of the present application further provides a compensation method, where the compensation method is used in the driving compensation circuit described in any of the above embodiments, and the content of the driving compensation circuit related to the compensation method in the embodiment of the present application refers to the description related to the driving compensation circuit in the above embodiments, and is not repeated herein. The compensation method may include at least the following steps.

And S10, obtaining the brightness attenuation rate Lx of different luminescent materials corresponding to different initial brightness.

Referring to fig. 9, fig. 9 is a flowchart illustrating the step S10 of the compensation method shown in fig. 8. In the embodiment of the present application, the step S10 may further include the following steps.

Step S11, determining 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 the present application is not particularly limited thereto.

In the embodiment of the present application, the luminance decay rate Lx of the luminescent materials corresponding to the three sub-pixels R, G, and B can be selected.

And S12, controlling each luminescent material to emit light for preset time corresponding to different initial brightness.

In the embodiment of the present application, it is understood that the larger the driving current applied to each light emitting element 151 is, the higher the light emission luminance is, and the more the luminance is attenuated. Different initial brightness of each luminescent material can be achieved by driving the luminescence with different driving currents. The test conditions were the same except for the drive current.

In the specific embodiment of the present application, the initial brightness of each luminescent material is selected to be controlled to be 300 nit (nit), 500nit, 800nit, 1200nit, and the like. Where nits is the unit of brightness, representing the candle brightness per square meter, used to define the subjective perception of brilliance by an observer.

It can be understood that the more the number of initial brightness values of the luminescent material is taken, the more brightness attenuation values obtained by the test are, and the higher the accuracy in compensation is. In addition, the initial brightness may also be determined by using more light emitting brightness according to the display panel 10, which is not particularly limited in the present application.

In the specific embodiment of the present application, the preset time may be 1000 hours, or other values may be selected according to actual requirements, which is not limited in the present application.

And S13, measuring the final brightness of each luminescent material after the luminescent material emits light for the preset time, and obtaining the brightness attenuation rate Lx of different luminescent materials corresponding to different initial brightness according to the initial brightness, the final brightness and the preset time.

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

Step S20, obtaining 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, in the process of displaying an image by using the display panel 10 normally, 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, obtaining a brightness attenuation difference value according to the brightness attenuation rate Lx and the display time of each display block through the control module 50.

Referring to fig. 10, fig. 10 is a flowchart illustrating the step S30 of the compensation method shown in fig. 8.

Step S31, obtaining a plurality of brightness attenuation values corresponding to different display blocks according to the received plurality of display times through the control module 50.

Step S32, obtaining a preset attenuation value according to the brightness attenuation values of the display blocks corresponding to the dynamic display through the control module 50.

In this embodiment, the preset attenuation value may be an average value of a plurality of brightness attenuation values of a display area corresponding to the display motion picture, which is not limited in this application.

In the embodiment of the present application, the preset attenuation value is obtained only according to the luminance attenuation value of the display block displaying the dynamic picture, and since the absolute value of the luminance attenuation value of the display block displaying the dynamic picture is smaller, the absolute value of the preset attenuation value obtained according to the preset attenuation value is smaller. Furthermore, the obtained preset attenuation value level is higher, the efficiency of obtaining the preset attenuation value is improved, and meanwhile, more display blocks with unbalanced brightness attenuation values are compensated, so that the uniformity of the brightness attenuation values of the display blocks of the display panel is higher, and the display effect is improved.

Step S33, comparing each brightness attenuation value with the preset attenuation value through the control module 50, and obtaining a plurality of brightness attenuation difference values according to the comparison result.

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

And when the absolute value of the brightness attenuation value is greater than the absolute value of the preset attenuation value, the brightness attenuation difference value is a negative value. And 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 value is a non-negative value.

Step S40, obtaining the compensation data according to the brightness attenuation difference, and performing display compensation on a part of the display blocks of the display panel 10 according to the brightness attenuation difference and the compensation data.

In this embodiment, when the brightness attenuation difference is a non-negative value, it indicates that the brightness attenuation rate of the display block corresponding to the brightness attenuation difference is low, and display compensation is not required.

In the embodiment of the present application, the compensation may refer to performing low gray scale display on the display area where the brightness attenuation difference is a negative value, and may also be referred to as screen saver display. And the brightness attenuation value of the display block is consistent with the brightness attenuation values of other areas. Further, the attenuation brightness values of the display blocks of the display panel 10 are balanced, and the aging speeds of the different luminescent materials are balanced, so as to improve the technical effect of the display panel 10 on displaying the image.

It is understood that the low gray scale display or the breath screen display means that the display panel is made to emit light in a case where it cannot be easily found by the naked eye of the user.

Based on the same concept, the embodiment of the present application further provides a display device 1000, where the display device 1000 includes the display panel 10 and the driving compensation circuit described in any of the foregoing embodiments. The driving compensation circuit is used for performing 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 supporting frame 30, wherein the display panel 10 is fixed to the supporting frame 30, and the power module 20 is disposed on the back of the display panel 10. The display panel 10 is used for displaying images, the power module 20 is electrically connected with the display panel 10 and used for providing power voltage for displaying images on the display panel 10, and the supporting frame 30 provides supporting and protecting effects for the display panel 10 and the power module 20.

It can be understood that the display device provided in the embodiments of the present application may be any product or component having a display function, such as a display screen of a notebook computer, a liquid crystal display, a liquid crystal television, a mobile phone, and a tablet computer.

In one embodiment, the display device 1000 further includes other necessary components and components such as a power panel, a high-voltage board, a key control board, etc., and those skilled in the art can supplement the display device 1000 accordingly according to the specific type and actual functions of the display device, and details are not repeated herein.

It is understood that the display device 1000 may also be used in electronic devices including functions such as a Personal Digital Assistant (PDA) and/or a music player, such as a mobile phone, a tablet computer, a wearable electronic device with wireless communication function (e.g., a smart watch), and the like. The electronic device may also be other electronic devices such as a Laptop computer (Laptop) with a touch sensitive surface (e.g., a touch panel), etc.

In summary, in the driving compensation circuit, the compensation method and the display device 1000 provided in the present application, the control module 50 and the data compensation module 60 are disposed in the driving compensation circuit 100, and the timing control module 40 obtains the display time of each display block, and further obtains the brightness attenuation value of each display block and the brightness attenuation difference value of each display block. Furthermore, the luminance attenuation difference is used to perform display compensation on a part of the display blocks, so as to balance the problem of image retention of the display picture caused by different aging speeds of the light-emitting materials of different display blocks, and improve the service life of the display panel 10. The display effect and the display taste of the display device 1000 are effectively improved. Further, the display effect and the service life of the display device 1000 are also effectively improved. In addition, the problem of increased manufacturing cost caused by the fact that the area of a sub-pixel is increased to overcome the display image retention in the prior art is also solved, therefore, the technical scheme of the application adjusts the attenuation rates and the aging rates of the R, G and B light-emitting elements to be consistent as much as possible by confirming the attenuation rates of different light-emitting elements, thereby avoiding the image retention problem caused by different attenuation rates and aging rates, and the manufacturing cost is lower.

The flow chart described in this application is only one example and many modifications may be made to this illustration or the steps in this application without departing from the spirit of the application. For instance, the steps may be performed in a differing order, or steps may be added, deleted or modified. It will be understood by those skilled in the art that all or a portion of the above described embodiments may be implemented and equivalents may be made thereto without departing from the scope of the invention as set forth in the claims.

In the description of the present specification, reference to the description of "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment 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 particular 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 the respective technical features in the above embodiments are described, however, the scope of the present specification should be considered as being described as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A drive compensation circuit comprises a time sequence control module and a drive module which are electrically connected with a display panel, wherein the time sequence control module drives the drive module to control the display panel to display images;

the time sequence control module acquires the display time of a plurality of display blocks of the display panel and transmits the display time to the control module; the control module obtains a plurality of brightness attenuation difference values according to the plurality of display time, and transmits the brightness attenuation difference values to the time sequence control module and the data compensation module; the data compensation module obtains compensation data according to the brightness attenuation difference values and transmits the compensation data to the driving module;

and when the display panel is in an unused state, the driving module performs display compensation on part of display blocks of the display panel according to the compensation data.

2. The driving compensation circuit as claimed in claim 1, wherein the control module stores in advance luminance decay rates corresponding to different initial luminance of different light-emitting materials, and the control module is configured to obtain luminance decay values corresponding to the display time for each block according to the luminance decay rates and the display time; the control module is further configured to obtain a preset attenuation value according to a plurality of brightness attenuation values corresponding to a display block of a dynamic picture displayed by the display panel, compare each brightness attenuation value with the preset attenuation value, and obtain a plurality of brightness attenuation difference values according to a comparison result, where the brightness attenuation difference values include information representing compensation time and compensation brightness.

3. The driving compensation circuit as claimed in claim 2, wherein the predetermined attenuation value is an average value of a plurality of the luminance attenuation values corresponding to a display block displaying a moving picture.

4. The driving compensation circuit as claimed in claim 2, wherein the luminance attenuation difference value is a negative value when the absolute value of the luminance attenuation value is greater than the absolute value of the preset attenuation value, the control module transmits the luminance attenuation difference value to the data compensation module and the timing control module;

and when the absolute value of the brightness attenuation value is smaller than or equal to the absolute value of the preset attenuation value, the brightness attenuation difference value is a non-negative value, and the display compensation of the display block of the display panel corresponding to the brightness attenuation difference value is not required.

5. The driving compensation circuit of claim 1, wherein the driving module comprises a data driving module and a scan driving module, the data driving module and the scan driving module are electrically connected to the timing control module, the data compensation module and the display panel, and the timing control module drives the scan driving module to scan a corresponding display block according to the brightness attenuation difference; and the time sequence control module controls the data driving module to transmit power signals to corresponding display blocks according to the compensation data according to the brightness attenuation difference value, and further performs display compensation on the corresponding display blocks of the display panel.

6. The driving compensation circuit according to claim 5, further comprising an external compensation module electrically connected to both the display panel and the data driving module, wherein the external compensation module stores a power supply voltage and a threshold voltage of a transistor for driving the light emitting element to emit light;

7. The driving compensation circuit according to any one of claims 2 to 6, wherein the display compensation means controlling a display area of the display panel to perform a low gray scale display such that the luminance attenuation value of the display area is equal to the preset attenuation value.

8. A compensation method for a drive compensation circuit according to any one of claims 1 to 7, wherein the compensation method comprises:

9. The compensation method of claim 8, wherein obtaining the luminance decay rate for different luminescent materials for different initial luminances comprises:

determining a plurality of different said luminescent materials;

10. The compensation method as claimed in claim 8, wherein the obtaining of the brightness attenuation difference value according to the brightness attenuation rate and the display time of each display block by the control module comprises:

obtaining a plurality of brightness attenuation values corresponding to different display blocks according to the received display time through the control module;

11. A display device comprising a display panel and the drive compensation circuit of any one of claims 1 to 7, wherein the drive compensation circuit is configured to perform display compensation on the display panel.