Display panel and brightness compensation method therefor, and display device

Abstract

The present application provides a display panel and a brightness compensation method therefor, and a display device. According to the display panel, a temperature sensing circuit is integrated in a driving circuit, so that the accuracy of temperature monitoring is improved; the voltage of a monitoring point of the temperature sensing circuit is read, and a power supply signal is compensated on the basis of a first compensation data model, or a data signal is compensated on the basis of a second compensation data model, so that the uniformity of the display brightness of the display panel can be improved.

Description

Display panel, brightness compensation method thereof, and display device

[0001] This application claims priority to Chinese patent application No. 202311872736.3 filed on December 29, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of display technology, and in particular to a display panel, a brightness compensation method thereof, and a display device. Background Art

[0003] Micro-LED (micro light emitting diode) display technology has the characteristics of self-luminescence, high efficiency, low power consumption, and fast response. Compared with organic light emitting diode (OLED) display technology, it also has advantages such as high stability and long service life.

[0004] Micro-LED display panels can achieve a high-brightness effect, but high brightness will inevitably cause heat, which will increase the overall temperature of the display panel. As the temperature rises, the concentration of electrons and holes will increase, the speed gap will decrease, and the electron mobility will decrease. In addition, as the temperature rises, the quantum efficiency of the phosphor decreases, the light output decreases, and the external light extraction efficiency of the Micro-LED decreases. When the temperature returns to the initial temperature, the light output will have a restorative growth. This is because some related parameters of the material will change with temperature, which will cause changes in the parameters of the Micro-LED device and affect the light output of the Micro-LED. When the temperature returns to the initial state, the changes in the parameters of the Micro-LED device disappear, and the light output of the Micro-LED will also return to the initial value. In summary, high temperature affects the efficiency of Micro-LED, causing changes in display brightness and affecting the integrity of the display. SUMMARY OF THE INVENTION

[0005] To address the issue of reduced luminous efficiency due to heating of the Micro-LED display panel, a temperature compensation solution is added. This involves connecting an external temperature sensor to the bottom frame of the Micro-LED display panel. This sensor detects the temperature of the display area, converts the detected temperature signal into an electrical signal, and feeds it back to the drive control system. The control system then compensates for the relevant parameters to ensure that the Micro-LED display effect is not affected. However, with this temperature compensation solution, the temperature sensor can only monitor the temperature of the lower half of the display area, not the upper half. This may result in a difference in brightness between the upper and lower halves of the display after compensation.

[0006] Therefore, it is necessary to provide a display panel and a brightness compensation method thereof to improve this defect.

[0007] An embodiment of the present application provides a display panel, comprising a display area and a non-display area disposed outside the display area, the display panel comprising:

[0008] substrate;

[0009] a driving circuit layer, disposed on the substrate, the driving circuit layer comprising a plurality of pixel driving circuits and a plurality of temperature sensing circuits, the pixel driving circuits being disposed in the display area, and the temperature sensing circuits being disposed in at least one of the display area and the non-display area;

[0010] Wherein, the display panel further includes:

[0011] a storage module, configured to store a pre-established first compensation data model and a second compensation data model, wherein the first compensation data model represents a correspondence between the voltage of the monitoring point of the temperature sensing circuit, the voltage of the power signal, and the brightness, and the second compensation data model represents a correspondence between the voltage of the monitoring point, the voltage of the data signal, the voltage of the power signal, and the brightness; and

[0012] A compensation module is used to determine whether brightness compensation is required based on the voltage of the monitoring point; and to select the first compensation data model or the second compensation data model based on the voltage of the monitoring point; compensate the power signal based on the voltage of the monitoring point and the first compensation data model; or compensate the data signal based on the voltage of the monitoring point and the second compensation data model.

[0013] An embodiment of the present application further provides a brightness compensation method for a display panel, wherein the display panel includes a display area and a non-display area disposed periphery of the display area. The display panel further includes a substrate and a drive circuit layer disposed on the substrate, the drive circuit layer having a plurality of pixel drive circuits and a plurality of temperature sensing circuits, the pixel drive circuits being disposed in the display area, and the temperature sensing circuit being disposed in at least one of the display area and the non-display area. The brightness compensation method for the display panel includes:

[0014] Obtaining voltages at a plurality of monitoring points of the temperature sensing circuit;

[0015] Determining whether brightness compensation is required according to the voltage at the monitoring point;

[0016] If brightness compensation is required, selecting the first compensation data model or the second compensation data model according to the voltage of the monitoring point;

[0017] Compensating the power signal according to the voltage at the monitoring point and the first compensation data model; or compensating at least the data signal according to the voltage at the monitoring point and the second compensation data model;

[0018] After all data compensation is completed, the loading screen will appear.

[0019] An embodiment of the present application further provides a display device, comprising a frame and a display panel, wherein the display panel is disposed on the frame, and comprises:

[0020] substrate;

[0021] a driving circuit layer, disposed on the substrate, the driving circuit layer comprising a plurality of pixel driving circuits and a plurality of temperature sensing circuits, the pixel driving circuits being disposed in the display area, and the temperature sensing circuits being disposed in at least one of the display area and the non-display area;

[0022] Wherein, the display panel further includes:

[0023] a storage module, configured to store a pre-established first compensation data model and a second compensation data model, wherein the first compensation data model represents a correspondence between the voltage of the monitoring point of the temperature sensing circuit, the voltage of the power signal, and the brightness, and the second compensation data model represents a correspondence between the voltage of the monitoring point, the voltage of the data signal, the voltage of the power signal, and the brightness; and

[0024] A compensation module is used to determine whether brightness compensation is required based on the voltage of the monitoring point; and to select the first compensation data model or the second compensation data model based on the voltage of the monitoring point; compensate the power signal based on the voltage of the monitoring point and the first compensation data model; or compensate the data signal based on the voltage of the monitoring point and the second compensation data model. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below only disclose some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] FIG1 is a common voltage load simulation circuit provided by an embodiment of the present application;

[0027] FIG2 is a waveform diagram of points A and B in the common voltage load simulation circuit shown in FIG1 ;

[0028] FIG3 is a schematic plan view of a second display panel provided in an embodiment of the present application;

[0029] FIG4 is a schematic diagram of the structure of a temperature sensing circuit provided in an embodiment of the present application;

[0030] FIG5 is a driving timing diagram of a temperature sensing circuit provided in an embodiment of the present application;

[0031] FIG6 is a schematic flow chart of a brightness compensation method for a display panel provided in an embodiment of the present application;

[0032] FIG7 is a schematic structural diagram of a display device provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0034] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0035] The present application may repeat reference numerals and / or reference letters in different embodiments. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0036] An embodiment of the present application provides a display panel that can improve the accuracy of temperature monitoring and avoid uneven display brightness caused by temperature increase of the display panel.

[0037] An embodiment of the present application provides a display panel, comprising a display area and a non-display area disposed outside the display area, the display panel comprising:

[0038] substrate;

[0039] a driving circuit layer, disposed on the substrate, the driving circuit layer comprising a plurality of pixel driving circuits and a plurality of temperature sensing circuits, the pixel driving circuits being disposed in the display area, and the temperature sensing circuits being disposed in at least one of the display area and the non-display area;

[0040] Wherein, the display panel further includes:

[0041] a storage module, configured to store a pre-established first compensation data model and a second compensation data model, wherein the first compensation data model represents a correspondence between the voltage of the monitoring point of the temperature sensing circuit, the voltage of the power signal, and the brightness, and the second compensation data model represents a correspondence between the voltage of the monitoring point, the voltage of the data signal, the voltage of the power signal, and the brightness; and

[0042] A compensation module is used to determine whether brightness compensation is required based on the voltage of the monitoring point; and to select the first compensation data model or the second compensation data model based on the voltage of the monitoring point; compensate the power signal based on the voltage of the monitoring point and the first compensation data model; or compensate the data signal based on the voltage of the monitoring point and the second compensation data model.

[0043] According to an embodiment of the present application, the temperature sensing circuit is disposed in the non-display area, and a plurality of the temperature sensing circuits are arranged at intervals along multiple side edges of the display area.

[0044] According to an embodiment of the present application, the driving circuit layer further comprises a gate driving circuit, and the gate driving circuit is disposed in the non-display area on at least one side of the display area;

[0045] Part of the temperature sensing circuit is arranged between the gate driving circuit and the display area; or part of the temperature sensing circuit is arranged on a side of the gate driving circuit away from the display area.

[0046] According to an embodiment of the present application, the display panel includes a plurality of light-emitting devices, the light-emitting devices are arranged in the display area, and the temperature sensing circuit is arranged in the display area and located in the gaps between the light-emitting devices.

[0047] According to an embodiment of the present application, the temperature sensing circuit includes a reset transistor, a drive transistor, a leakage transistor, a current source transistor, and a capacitor, and the display panel further includes a readout trace;

[0048] In which, the source of the reset transistor, the source of the drive transistor and the first end of the capacitor are all connected to a DC high-voltage power supply signal, the drain of the reset transistor and the gate of the drive transistor, the source of the leakage transistor and the second end of the capacitor are electrically connected to a first node; the gate of the reset transistor is connected to a reset signal; the gate and drain of the leakage transistor are both connected to a common voltage signal, the drain of the drive transistor and the source of the current source transistor are electrically connected to a second node, the drain of the current source transistor is connected to a DC low-voltage power supply signal, the gate of the current source transistor is connected to a current source control signal, the read line is electrically connected to the second node, the second node is the monitoring point, and the read line is used to read the voltage of the second node.

[0049] According to an embodiment of the present application, the channel area of ​​the leakage transistor is at least larger than the channel area of ​​other transistors in the temperature sensing circuit.

[0050] An embodiment of the present application further provides a brightness compensation method for a display panel, which is applicable to the display panel provided in any of the above embodiments. The brightness compensation method for a display panel includes:

[0051] Obtaining the voltage of each monitoring point of the temperature sensing circuit;

[0052] Determining whether brightness compensation is required according to the voltage at the monitoring point;

[0053] If brightness compensation is required, selecting the first compensation data model or the second compensation data model according to the voltage of the monitoring point;

[0054] Compensating the power signal according to the voltage at the monitoring point and the first compensation data model; or compensating at least the data signal according to the voltage at the monitoring point and the second compensation data model;

[0055] After all data compensation is completed, the loading screen will appear.

[0056] According to an embodiment of the present application, the step of determining whether brightness compensation is required based on the voltage at the monitoring point includes:

[0057] Determining whether the voltage at the monitoring point is less than a preset threshold voltage;

[0058] If the voltage at the monitoring point is less than the threshold voltage, it is determined that brightness compensation is required; if the voltage at the monitoring point is greater than or equal to the threshold voltage, it is determined that brightness compensation is not required.

[0059] According to an embodiment of the present application, the step of selecting the first compensation data model or the second compensation data model according to the voltage of the monitoring point includes:

[0060] Determining whether the voltages of the monitoring points of the temperature sensing circuits are the same;

[0061] If they are the same, the first compensation data model is selected; if they are different, the second compensation data model is selected.

[0062] According to an embodiment of the present application, the step of compensating at least the data signal according to the voltage at the monitoring point and the second compensation data model includes:

[0063] determining whether a target brightness of a display area corresponding to the temperature sensing circuit exceeds a brightness compensation range of the data signal;

[0064] If not, obtaining a compensation coefficient for the data signal according to the voltage at the monitoring point and the second compensation data model;

[0065] compensating the data signal according to a compensation coefficient of the data signal;

[0066] If exceeded, obtaining a compensation coefficient of the power signal and a compensation coefficient of the data signal according to the voltage of the monitoring point and the second compensation data model;

[0067] Compensating the power signal according to the compensation coefficient of the power signal;

[0068] The data signal is compensated according to the compensation coefficient of the data signal.

[0069] Beneficial effects of the embodiments of the present application: The embodiments of the present application provide a display panel and a brightness compensation method thereof, which improves the accuracy of temperature monitoring by integrating a temperature sensing circuit in a driving circuit layer of a display panel and setting it in a display area or a non-display area. By reading the voltage of the monitoring point of the temperature sensing circuit and compensating the power supply signal according to a pre-established first compensation data model, or compensating the data signal according to a pre-established second compensation data model, not only can the influence of temperature increase on the display effect of the actual panel be avoided, but also the uniformity of the display brightness of the display panel can be improved.

[0070] As shown in Figures 1 and 2, Figure 1 is a planar schematic diagram of the first display panel provided by an embodiment of the present application, and Figure 2 is a cross-sectional view of the first display panel shown in Figure 1 along the A-A' direction. The display panel includes a display area AA and a non-display area NA arranged on the periphery of the display area AA. The display area AA is used to realize the function of displaying an image, and the non-display area NA is used to place other driving circuits and wiring. The display panel also includes a substrate 1 and a driving circuit layer 2, and the driving circuit layer 2 is arranged on the substrate 1. The driving circuit layer 2 has a plurality of pixel driving circuits 21 and a plurality of temperature sensing circuits 22. The pixel driving circuit 21 is arranged in the display area AA, and the temperature sensing circuit 22 is arranged in at least one of the display area AA and the non-display area NA.

[0071] In the embodiment of the present application, the substrate 1 is a glass substrate. In practical applications, the material of the substrate 1 is not limited to the glass in the above embodiment, but can also be transparent polyimide.

[0072] The driving circuit layer 2 includes but is not limited to an active layer 201 , a gate insulating layer 202 , a first metal layer 203 , an interlayer dielectric layer 204 , a second metal layer 205 , a passivation layer 206 , a first electrode layer 207 and an organic insulating layer 208 stacked sequentially on the substrate 1 .

[0073] It should be noted that FIG2 only illustrates the film layer positional relationship between the pixel driving circuit 21 and the temperature sensing circuit 22, and FIG2 only illustrates one transistor in the pixel driving circuit 21 and the temperature sensing circuit 22, and does not represent the film layer structure of the driving circuit layer 2, the pixel driving circuit 21, and the temperature sensing circuit 22 in actual applications. In actual applications, the film layer structure of the driving circuit layer 2 and the film layer structure and circuit structure of the pixel driving circuit 21 can be replaced with other known organic light-emitting diode or micro light-emitting diode display panels to achieve the same or similar functions.

[0074] In some implementations, as shown in FIG. 1 and FIG. 2 , the temperature sensing circuit 22 is disposed in the non-display area NA, and a plurality of temperature sensing circuits 22 are arranged at intervals along multiple side edges of the display area AA.

[0075] In one embodiment, the non-display area NA includes a lower border area NA1 located below the display area AA, an upper border area NA2 located above the display area AA, a left border area NA3 located on the left side of the display area AA, and a right border area NA4 located on the right side of the display area AA. The lower border area NA1 is not provided with a temperature sensing circuit 22, and the upper border area NA2, the left border area NA3 and the right border area NA4 are all provided with multiple temperature sensing circuits 22. The multiple temperature sensing circuits 22 are arranged at intervals along the edge of the display area AA close to them.

[0076] Taking the upper bezel area NA2 as an example, multiple temperature sensing circuits 22 are provided in the upper bezel area NA2. The temperature sensing circuits 22 are arranged at intervals along the upper edge of the display area AA. The temperature sensing circuits 22 in the left bezel area NA3 and the right bezel area NA4 are also arranged at intervals along the left or right edge of the display area AA.

[0077] It should be noted that FIG. 1 only illustrates the arrangement of the temperature sensing circuits 22 in the non-display area NA, and the number of the temperature sensing circuits 22 in FIG. 1 does not represent the number of temperature sensing circuits 22 in actual applications.

[0078] In the above-described structure of the embodiment of the present application, by integrating the temperature sensing circuit 22 into the display panel's drive circuit layer 2 and placing it on multiple edges of the display area AA, the accuracy of temperature monitoring in the display area AA can be improved, thereby avoiding uneven brightness of the display panel after compensation. In addition, compared to externally connecting a temperature detection device to the non-display area NA, the embodiment of the present application, by integrating the temperature sensing circuit 22 into the display panel's drive circuit layer 2, can reduce the space occupied by the temperature sensing circuit 22 in the non-display area NA, thereby reducing the width of the display panel's border and achieving the technical effect of a narrow border.

[0079] In some embodiments, the driving circuit layer 2 further has a gate driving circuit 23, which is arranged in the non-display area NA on at least one side of the display area AA, and part of the temperature sensing circuit 22 is arranged between the gate driving circuit 23 and the display area AA; or, part of the temperature sensing circuit 22 is arranged on the side of the gate driving circuit 23 away from the display area AA.

[0080] In one embodiment, as shown in FIG1 , the drive circuit layer 2 has two gate drive circuits 23 , which are respectively disposed in the non-display areas NA on opposite sides of the display area AA, i.e., one gate drive circuit 23 is disposed in the left border area NA3 and the other gate drive circuit 23 is disposed in the right border area NA4 . The drive circuit layer 2 also includes a source drive circuit 24 , which is disposed in the lower border area A1 . In the left border area NA3 , multiple temperature sensing circuits 22 are disposed between the gate drive circuit 23 and the display area AA. In the right border area NA4 , multiple temperature sensing circuits 22 are also disposed between the gate drive circuit 23 and the display area AA.

[0081] In one embodiment, the driver circuit layer 2 includes two gate driver circuits 23, which are disposed in the non-display area NA on opposite sides of the display area AA. Specifically, one gate driver circuit 23 is disposed in the left border area NA3, and the other gate driver circuit 23 is disposed in the right border area NA4. In the left border area NA3, multiple temperature sensing circuits 22 are disposed on the side of the gate driver circuit 23 away from the display area AA. In the right border area NA4, multiple temperature sensing circuits 22 are also disposed on the side of the gate driver circuit 23 away from the display area AA.

[0082] As shown in Figure 3, Figure 3 is a planar schematic diagram of the second display panel provided in an embodiment of the present application. The structure of the second display panel shown in Figure 3 is roughly the same as the structure of the first display panel shown in Figure 1, with the difference that the area where the temperature sensing circuit 22 is set is different. In the second display panel shown in Figure 3, the temperature sensing circuit 22 is set in the display area AA.

[0083] Specifically, the display panel further includes a plurality of light-emitting devices 4, which are disposed in display area AA. The temperature sensing circuit 22 is also disposed in display area AA and is located in the gaps between the light-emitting devices 4. In this structure, by integrating the temperature sensing circuit 22 into the display panel's drive circuit layer 2 and disposing it in display area AA, the accuracy of temperature monitoring can be improved, thereby avoiding uneven brightness on the display screen after compensation.

[0084] In one embodiment, the light emitting device 4 is a Micro-LED. In other embodiments, the type of the light emitting device is not limited to the Micro-LED in the above embodiment, and may also be an OLED, a Mini-LED, or other electroluminescent devices.

[0085] It should be noted that Figure 3 only illustrates the area where the temperature sensing circuits 22 are located. The number and density of the temperature sensing circuits 22 in Figure 3 do not represent the number and density of the temperature sensing circuits 22 within the display area AA in actual applications. In actual applications, the number and density of the temperature sensing circuits 22 within the display area AA can be set based on the resolution of the display panel, the distance between the light-emitting devices, and the requirements for temperature monitoring accuracy, and are not limited here.

[0086] In some embodiments, as shown in Figure 4, Figure 4 is a structural diagram of the temperature sensing circuit provided in an embodiment of the present application. The temperature sensing circuit 22 includes a reset transistor T1, a driving transistor T2, a leakage transistor T3, a current source transistor T4 and a capacitor C, and the display panel also includes a read line Readout.

[0087] Specifically, the source of the reset transistor T1, the source of the drive transistor T2, and the first end of the capacitor C are all connected to the DC high-voltage power supply signal VDD. The drain of the reset transistor T1, the gate of the drive transistor T2, the source of the leakage transistor T3, and the second end of the capacitor C are electrically connected to a first node Q. The gate of the reset transistor T1 is connected to the reset signal Rst. The gate and drain of the leakage transistor T3 are connected to the common voltage signal Com. The drain of the drive transistor T2 and the source of the current source transistor T4 are electrically connected to a second node N. The drain of the current source transistor T4 is connected to the DC low-voltage power supply signal VSS. The gate of the current source transistor T4 is connected to the current source control signal Vb. The read trace Readout is electrically connected to the second node N, which is a monitoring point of the temperature sensing circuit 22. The read trace Readout is used to read the voltage of the second node N.

[0088] As the temperature rises, the leakage current capability of the leakage transistor T3 changes, the potential of the first node Q changes, and the voltage of the second node N read by the readout line Readout also changes. As the temperature rises, the current Ioff of the leakage transistor T3 in the off state increases, the leakage current increases, and the potential of the first node Q changes within the same time, resulting in different voltages of the second node N read by the readout line Readout.

[0089] In some embodiments, the channel area of ​​the leakage transistor T3 is at least larger than the channel areas of other transistors in the temperature sensing circuit 22 , so that the leakage of the leakage transistor T3 can be more obvious and the voltage of the second node N can be read more easily.

[0090] In some embodiments, the channel area of ​​the leakage transistor T3 is not only larger than the channel areas of other transistors in the temperature sensing circuit 22 , but also larger than the channel areas of other transistors in the driving circuit layer 2 .

[0091] 4 and 5 , FIG5 is a driving timing diagram of the temperature sensing circuit provided in an embodiment of the present application. The driving timing of the temperature sensing circuit includes a reset phase t1 , a leakage phase t2 , and a reading phase t3 .

[0092] In the reset phase t1, the reset signal Rst is at a high level, the common voltage signal Com and the current source control signal Vb are both at a low level, the reset transistor T1 is turned on, the driving transistor T2, the leakage transistor T3 and the current source transistor T4 are all turned off, and the potential of the first node Q is reset to the same as the potential of the DC high voltage power supply signal VDD.

[0093] During leakage phase t2, the reset signal Rst, the common voltage signal Com, and the current source control signal Vb are all at low potentials. The reset transistor T1, the drive transistor T2, the leakage transistor T3, and the current source transistor T4 are all turned off. The potential of the first node Q decreases, and the potential of the second node N also decreases. During leakage phase t2, the leakage time can be set based on actual needs and is not limited here.

[0094] In the reading phase t3 , the read signal line Readout collects the potential of the second node N.

[0095] Based on the characteristics of the aforementioned temperature-sensing circuit 22, a temperature-voltage model can be established. The temperature-voltage model represents the corresponding relationship between the temperature of the display area corresponding to the temperature-sensing circuit 22 and the voltage of the second node N. By reading the voltage of the second node N, the current temperature of the display area corresponding to the temperature-sensing circuit 22 can be determined. Temperature changes cause changes in the brightness of the display panel. By establishing a temperature-brightness model that represents the corresponding relationship between the temperature and brightness of the display area corresponding to the temperature-sensing circuit 22, a voltage-brightness model is ultimately formed. This model is stored in a storage unit and can be used to calculate compensation to perform brightness compensation on the display panel.

[0096] In an embodiment of the present application, the display panel further includes a storage module 31 and a compensation module 32. The storage module 31 is used to store a pre-established first compensation data model and a second compensation data model, wherein the first compensation data model represents the correspondence between the voltage of the monitoring point, the voltage of the power signal, and the brightness, and the second compensation data model represents the correspondence between the voltage of the monitoring point, the voltage of the data signal, the voltage of the power signal, and the brightness.

[0097] The compensation module 32 is used to determine whether brightness compensation is required based on the voltage of the monitoring point; and is used to select the first compensation data model or the second compensation data model based on the voltage of the monitoring point; compensate the power signal based on the voltage of the monitoring point and the first compensation data model; or compensate the data signal based on the voltage of the monitoring point and the second compensation data model.

[0098] In an embodiment of the present application, the temperature sensing circuit is integrated into the driving circuit layer of the display panel and is set in the display area or the non-display area to improve the accuracy of temperature monitoring. By reading the voltage of the monitoring point of the temperature sensing circuit and compensating the power signal according to a pre-established first compensation data model, or compensating the data signal according to a pre-established second compensation data model, a compensation mechanism that mixes the power signal and the data signal can solve the problems of limited compensation capability of a single compensation mechanism and excessive compensation data processing volume, thereby maximizing the optimization of data volume processing in compensation.

[0099] In one embodiment, the display panel also includes a peripheral circuit control system 3, which may include but is not limited to a timing control circuit, which is electrically connected to the source drive circuit 24 and the gate drive circuit 23. The timing control circuit includes a storage module and a compensation module, and the read line Readout is electrically connected to the compensation module to feed back the voltage of the second node N read in real time to the compensation module.

[0100] An embodiment of the present application also provides a brightness compensation method for a display panel, which is applicable to a display panel provided by any of the above embodiments, as shown in Figure 6, which is a flow chart of the brightness compensation method for a display panel provided by an embodiment of the present application, the brightness compensation method for a display panel includes: obtaining the voltages of monitoring points of multiple temperature sensing circuits; judging whether brightness compensation is required based on the voltages of the monitoring points; if brightness compensation is required, selecting a first compensation data model or a second compensation data model based on the voltages of the monitoring points; compensating the power supply signal based on the voltages of the monitoring points and the first compensation data model; or, compensating at least the data signal based on the voltages of the monitoring points and the second compensation data model; after each data compensation is completed, loading the screen.

[0101] In one embodiment, the step of determining whether brightness compensation is required based on the voltage at the monitoring point includes: determining whether the voltage at the monitoring point is less than a preset threshold voltage; if the voltage at the monitoring point is less than the threshold voltage, determining that brightness compensation is required; if the voltage at the monitoring point is greater than or equal to the threshold voltage, determining that brightness compensation is not required.

[0102] In one embodiment, the step of selecting the first compensation data model or the second compensation data model based on the voltage of the monitoring point includes: determining whether the voltages of the monitoring points of multiple temperature sensing circuits are the same; if they are the same, selecting the first compensation data model; if they are different, selecting the second compensation data model.

[0103] The same voltage at the monitoring points of the temperature sensing circuit indicates that the temperatures of the display areas corresponding to the temperature sensing circuits are the same. Different voltages at the monitoring points of the temperature sensing circuits indicate that the temperatures of the display areas corresponding to the temperature sensing circuits are different.

[0104] It should be noted that a display panel may have multiple temperature-sensing circuits. If the voltages at the monitoring points of all temperature-sensing circuits are the same, a first compensation data model is selected, and the power signal is compensated based on the voltages at the monitoring points and the first compensation data model. If the voltage at the monitoring point of at least one temperature-sensing circuit is different from the voltages at the monitoring points of the other temperature-sensing circuits, a second compensation data model is selected, and the data signal is compensated based on the voltages at the monitoring points and the second compensation data model.

[0105] In one embodiment, the power signal includes a DC high-voltage power signal VDD and a DC low-voltage power signal VSS. The first compensation data model represents a correspondence between the voltage at the monitoring point, the DC high-voltage power signal VDD, the DC low-voltage power signal VSS, and the brightness. The step of compensating the power signal according to the voltage at the monitoring point and the first compensation data model includes:

[0106] According to the voltage of the monitoring point and the first compensation data model, a compensation coefficient of the DC high-voltage power signal VDD and a compensation coefficient of the DC low-voltage power signal VSS are obtained; the DC high-voltage power signal VDD is compensated according to the compensation coefficient of the DC high-voltage power signal VDD, and the DC low-voltage power signal VSS is compensated according to the compensation coefficient of the DC low-voltage power signal VSS.

[0107] If data is retrieved from the first compensation data model, the DC high-voltage power signal VDD and the DC low-voltage power signal VSS are compensated using the first compensation data model. This eliminates the need to perform separate compensation processing on the image data of multiple display areas, thereby reducing the amount of system data processing.

[0108] In some embodiments, based on the voltage at the monitoring point and the second compensation data model, at least the step of compensating the data signal includes: determining whether the target brightness of the display area corresponding to the temperature sensing circuit exceeds the brightness compensation range of the data signal; if not, obtaining the compensation coefficient of the data signal based on the voltage at the monitoring point and the second compensation data model; compensating the data signal based on the compensation coefficient of the data signal; if exceeded, obtaining the compensation coefficient of the power signal and the compensation coefficient of the data signal based on the voltage at the monitoring point and the second compensation data model; compensating the power signal based on the compensation coefficient of the power signal; compensating the data signal based on the compensation coefficient of the data signal.

[0109] It should be noted that if the second compensation data model is accessed to retrieve data and the data signal Vdata of different display areas is compensated, the system needs to process and compensate the image data. In actual situations, the brightness compensation capability of the data signal Vdata is limited. When the target brightness is within the brightness compensation range of the data signal Vdata, the compensation coefficient of the data signal Vdata is obtained according to the voltage of the monitoring point and the second compensation data model, and the data signal Vdata is compensated according to the compensation coefficient of the data signal Vdata. When the brightness of the display panel changes significantly, the data signal Vdata cannot be compensated. It is necessary to first perform power signal compensation, that is, according to the voltage of the monitoring point and the second compensation data model, obtain the compensation coefficient of the DC high-voltage power signal VDD and the compensation coefficient of the data signal Vdata, call the power signal compensation module in the compensation module, and compensate the DC high-voltage power signal VDD according to the compensation coefficient of the DC high-voltage power signal VDD to adjust the target brightness of the display panel to within the compensation range of the data signal Vdata; then, according to the compensation coefficient of the data signal Vdata, call the data signal compensation module in the compensation module to compensate the data signal Vdata. In this way, a compensation mechanism that mixes the data signal Vdata, the DC high-voltage power signal VDD, and the DC low-voltage power signal VSS can be utilized to solve the problems of limited compensation capability and large amount of compensation data processing of a single compensation mechanism, thereby optimizing the data processing during compensation to the maximum extent.

[0110] Based on the display panel and brightness compensation method thereof provided in the above-mentioned embodiments of the present application, an embodiment of the present application further provides a display device, as shown in FIG7 , which is a schematic structural diagram of the display device provided in the embodiment of the present application. The display device includes at least a frame 200 and a display panel 100, and the display panel 100 is disposed on the frame 200. The display panel 100 in the embodiment of the present application can be the display panel provided in any of the above-mentioned embodiments, and the display panel 100 can have the same function as the display panel provided in any of the above-mentioned embodiments in the display device provided in the embodiment of the present application. In addition, the display panel 100 in the embodiment of the present application can be compensated using the brightness compensation method of the display panel provided in any of the above-mentioned embodiments, which will not be described in detail here.

[0111] The display device in the embodiments of the present application may be a mobile display device, such as a smart phone, a smart watch, a laptop computer, or a tablet computer, or may be a fixed terminal, such as a television, a desktop computer, or the like.

[0112] Beneficial effects of the embodiments of the present application: The embodiments of the present application provide a display panel and a brightness compensation method for a display panel, which improves the accuracy of temperature monitoring by integrating a temperature sensing circuit into a driving circuit of the display panel and setting it in a display area or a non-display area. By reading the voltage of the monitoring point of the temperature sensing circuit and compensating the power signal according to a pre-established first compensation data model, or compensating the data signal according to a pre-established second compensation data model, not only can the influence of temperature increase on the display effect of the actual panel be avoided, but also the uniformity of the display brightness of the display panel can be improved.

[0113] In summary, although the present application is disclosed above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application is based on the scope defined by the claims.

Claims

1. A display panel includes a display area and a non-display area disposed around the display area. The display panel includes: a substrate; a driving circuit layer disposed on the substrate. The driving circuit layer has a plurality of pixel driving circuits and a plurality of temperature sensing circuits. The pixel driving circuits are disposed in the display area, and the temperature sensing circuits are disposed in at least one of the display area and the non-display area; wherein, the display panel further includes: a storage module for storing a pre-established first compensation data model and a second compensation data model. The first compensation data model represents the corresponding relationship between the voltage of the monitoring point of the temperature sensing circuit, the voltage of the power supply signal, and the luminance. The second compensation data model represents the corresponding relationship between the voltage of the monitoring point, the voltage of the data signal, and the voltage of the power supply signal and the luminance; and a compensation module for determining whether brightness compensation is required according to the voltage of the monitoring point; and for selecting the first compensation data model or the second compensation data model according to the voltage of the monitoring point; compensating the power supply signal according to the voltage of the monitoring point and the first compensation data model; or compensating the data signal according to the voltage of the monitoring point and the second compensation data model.

2. The display panel according to claim 1, wherein, The temperature sensing circuits are disposed in the non-display area, and the plurality of temperature sensing circuits are arranged at intervals along the multi-side edges of the display area.

3. The display panel according to claim 2, wherein, The driving circuit layer further has a gate driving circuit, and the gate driving circuit is disposed in the non-display area on at least one side of the display area; wherein, some of the temperature sensing circuits are disposed between the gate driving circuit and the display area; or some of the temperature sensing circuits are disposed on the side of the gate driving circuit away from the display area.

4. The display panel according to claim 1, wherein, The display panel includes a plurality of light emitting devices, the light emitting devices are disposed in the display area, and the temperature sensing circuits are disposed in the display area and located in the vacancies between the light emitting devices.

5. The display panel according to claim 1, wherein, The temperature sensing circuit includes a reset transistor, a driving transistor, a leakage transistor, a current source transistor, and a capacitor. The display panel further includes a reading trace; wherein, the source of the reset transistor, the source of the driving transistor, and the first end of the capacitor are all connected to a DC high voltage power supply signal. The drain of the reset transistor is electrically connected to the gate of the driving transistor, the source of the leakage transistor, and the second end of the capacitor at a first node. The gate of the reset transistor is connected to a reset signal. The gate and the drain of the leakage transistor are both connected to a common voltage signal. The drain of the driving transistor is electrically connected to the source of the current source transistor at a second node. The drain of the current source transistor is connected to a DC low voltage power supply signal. The gate of the current source transistor is connected to a current source control signal. The reading trace is electrically connected to the second node, and the second node is the monitoring point. The reading trace is used to read the voltage of the second node.

6. The display panel according to claim 5, wherein, The channel area of the leakage transistor is at least larger than the channel areas of other transistors in the temperature sensing circuit.

7. The display panel according to claim 5, wherein, The display panel further includes a peripheral circuit control system, a source driver circuit, and a gate driver circuit. The peripheral circuit control system includes a timing control circuit, and the timing control circuit is electrically connected to the source driver circuit and the gate driver circuit.

8. The display panel according to claim 7, wherein, The timing control circuit includes the storage module and the compensation module. The reading trace is electrically connected to the compensation module, and the reading trace is used to feed back the voltage of the second node read in real time to the compensation module.

9. A method for compensating the brightness of a display panel. The display panel includes a display area and a non-display area disposed outside the display area. The display panel further includes a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer has a plurality of pixel driving circuits and a plurality of temperature sensing circuits. The pixel driving circuits are disposed in the display area, and the temperature sensing circuits are disposed in at least one of the display area and the non-display area. The method for compensating the brightness of the display panel includes: Obtaining the voltages of the monitoring points of a plurality of the temperature sensing circuits; Judging whether brightness compensation is required according to the voltages of the monitoring points; If brightness compensation is required, selecting a pre-established first compensation data model or a second compensation data model according to the voltages of the monitoring points; Compensating the power supply signal according to the voltages of the monitoring points and the first compensation data model; or compensating at least the data signal according to the voltages of the monitoring points and the second compensation data model; After each data compensation is completed, loading a picture.

10. The brightness compensation method of the display panel according to claim 9, wherein, The step of judging whether brightness compensation is required according to the voltages of the monitoring points includes: Judging whether the voltages of the monitoring points are less than a pre-set threshold voltage; If the voltages of the monitoring points are less than the threshold voltage, it is determined that brightness compensation is required; if the voltages of the monitoring points are greater than or equal to the threshold voltage, it is determined that brightness compensation is not required.

11. The brightness compensation method of the display panel according to claim 9, wherein, The step of selecting the first compensation data model or the second compensation data model according to the voltages of the monitoring points includes: Judging whether the voltages of the monitoring points of a plurality of the temperature sensing circuits are the same; If they are the same, selecting the first compensation data model; if they are different, selecting the second compensation data model.

12. The brightness compensation method for a display panel according to claim 9, wherein, The step of compensating at least the data signal according to the voltages of the monitoring points and the second compensation data model includes: Judging whether the target brightness of the display area corresponding to the temperature sensing circuit exceeds the brightness compensation range of the data signal; If it does not exceed, obtaining the compensation coefficient of the data signal according to the voltages of the monitoring points and the second compensation data model; Compensating the data signal according to the compensation coefficient of the data signal; If it exceeds, obtaining the compensation coefficient of the power supply signal and the compensation coefficient of the data signal according to the voltages of the monitoring points and the second compensation data model; Compensating the power supply signal according to the compensation coefficient of the power supply signal; Compensating the data signal according to the compensation coefficient of the data signal.

13. A display device, the display device includes a frame and a display panel, the display panel is disposed on the frame, and the display panel includes: a substrate; a driving circuit layer disposed on the substrate, the driving circuit layer having a plurality of pixel driving circuits and a plurality of temperature sensing circuits, the pixel driving circuits are disposed in the display area, and the temperature sensing circuits are disposed in at least one of the display area and the non-display area; Wherein, the display panel further includes: a storage module for storing a pre-established first compensation data model and a second compensation data model, the first compensation data model representing the correspondence between the voltage of the monitoring points of the temperature sensing circuit, the voltage of the power supply signal and the brightness, and the second compensation data model representing the correspondence between the voltage of the monitoring points, the voltage of the data signal, and the voltage of the power supply signal and the brightness; and a compensation module for judging whether brightness compensation is required according to the voltage of the monitoring points; and for selecting the first compensation data model or the second compensation data model according to the voltage of the monitoring points; compensating the power supply signal according to the voltage of the monitoring points and the first compensation data model; or compensating the data signal according to the voltage of the monitoring points and the second compensation data model.

14. The display device according to claim 13, wherein, The temperature sensing circuits are disposed in the non-display area, and a plurality of the temperature sensing circuits are arranged at intervals along the multi-side edges of the display area.

15. The display device according to claim 14, wherein, The driving circuit layer further has a gate driving circuit, and the gate driving circuit is disposed in the non-display area on at least one side of the display area; Wherein, some of the temperature sensing circuits are disposed between the gate driving circuit and the display area; or some of the temperature sensing circuits are disposed on a side of the gate driving circuit away from the display area.

16. The display device according to claim 13, wherein, The display panel includes a plurality of light emitting devices, the light emitting devices are disposed in the display area, and the temperature sensing circuits are disposed in the display area and are located in the vacancies between the light emitting devices.

17. The display device according to claim 13, wherein, The temperature sensing circuit includes a reset transistor, a driving transistor, a leakage transistor, a current source transistor, and a capacitor, and the display panel further includes a reading trace; Wherein, the source of the reset transistor, the source of the driving transistor, and the first end of the capacitor are all connected to a DC high voltage power supply signal, the drain of the reset transistor is electrically connected to the gate of the driving transistor, the source of the leakage transistor, and the second end of the capacitor at a first node; the gate of the reset transistor is connected to a reset signal; the gate and the drain of the leakage transistor are both connected to a common voltage signal, the drain of the driving transistor is electrically connected to the source of the current source transistor at a second node, the drain of the current source transistor is connected to a DC low voltage power supply signal, the gate of the current source transistor is connected to a current source control signal, the reading trace is electrically connected to the second node, the second node is the monitoring point, and the reading trace is used to read the voltage of the second node.

18. The display device according to claim 17, wherein, The channel area of the leakage transistor is at least larger than the channel areas of other transistors in the temperature sensing circuit.

19. The display device according to claim 17, wherein, The display panel further includes a peripheral circuit control system, a source driver circuit, and a gate driver circuit. The peripheral circuit control system includes a timing control circuit, and the timing control circuit is electrically connected to the source driver circuit and the gate driver circuit.

20. The display device according to claim 17, wherein, The timing control circuit includes the storage module and the compensation module. The read line is electrically connected to the compensation module, and the read line is used to feedback the voltage of the second node read in real time to the compensation module.

Images