A display panel, a brightness compensation method, a compensation device and a display device thereof

Abstract

The application provides a display panel and a brightness compensation method, a compensation device and a display device thereof. The brightness compensation method comprises the following steps: obtaining first brightness attenuation data of the display panel in a first light-emitting state; obtaining second brightness attenuation data of the display panel in a second light-emitting state; calculating net brightness attenuation data according to the first brightness attenuation data and the second brightness attenuation data; the net brightness attenuation data is used to represent the non-recoverable brightness attenuation caused by the efficiency attenuation of the light-emitting device; obtaining brightness compensation data based on the net brightness attenuation data and the target brightness of the display panel, and generating a compensation control signal to adjust the driving parameter of the driving transistor device, so as to compensate the brightness of the display panel. In the brightness compensation, the recoverable attenuation of the driving transistor device is removed, the over-compensation of the brightness is avoided, the attenuation speed of the brightness life is effectively slowed down, and the service life of the display panel is prolonged.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display panel and its brightness compensation method, compensation device and display device. Background Technology

[0002] Organic light-emitting diode (OLED) display panels have been widely used in the display field due to their advantages such as self-illumination, high response speed, high luminous efficiency, wide viewing angle, and good flexibility. The pixel driving circuit of an OLED display panel typically includes driving transistor devices and light-emitting devices. The driving transistor devices drive the light-emitting devices to emit light, thereby controlling the brightness of the pixels.

[0003] However, OLED display panels experience brightness degradation over long-term use. For example... Figure 1 As shown, in existing brightness lifetime compensation solutions for mid-sized automotive OLED displays, the screen lifetime data collection method typically involves continuously lighting the screen and collecting the brightness-time curves for each frame (e.g., ...). Figure 2 As shown in the figure, the screen is then compensated according to the brightness decay trend of the product. Since the brightness decay is actually caused by the combined decay of the efficiency of the light-emitting device and the efficiency decay of the driving transistor, the existing method does not distinguish between them and directly uses the total decay as the basis for compensation, which easily leads to the problem of over-compensation in actual applications.

[0004] Specifically, since the in-vehicle screen is frequently powered on and off, the efficiency of the driving transistors partially recovers after power-off, and the brightness rebounds. If the original total attenuation compensation is still applied, it will result in excessive compensation, which will actually accelerate the lifespan degradation.

[0005] Therefore, how to achieve accurate brightness compensation for display panels has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] Based on this, the present invention provides a display panel and its brightness compensation method, compensation device and display device, to solve the technical problem in the existing brightness compensation scheme that overcompensation and accelerated brightness lifespan decay are caused by the failure to distinguish between the efficiency decay of light-emitting devices and the efficiency decay of driving transistor devices.

[0007] In a first aspect, embodiments of this application also provide a brightness compensation method for a display panel, the display panel including a light-emitting device and a driving transistor device connected to the light-emitting device; the brightness compensation method includes:

[0008] Acquire first brightness decay data of the display panel in a first luminous state; the first brightness decay data is used to characterize the total brightness decay caused by the combined efficiency decay of the light-emitting device and the efficiency decay of the driving transistor device.

[0009] The second brightness decay data of the display panel in the second light-emitting state is obtained; the second brightness decay data is used to characterize the recoverable brightness decay caused solely by the efficiency decay of the driving transistor device; wherein, the light-emitting duration of the light-emitting device in the second light-emitting state is less than the light-emitting duration of the light-emitting device in the first light-emitting state;

[0010] Net brightness decay data is calculated based on the first brightness decay data and the second brightness decay data; the net brightness decay data is used to characterize the irreversible brightness decay caused by the efficiency decay of the light-emitting device.

[0011] Based on the net brightness attenuation data and the target brightness of the display panel, brightness compensation data is obtained, and a compensation control signal is generated to adjust the driving parameters of the driving transistor device to compensate the brightness of the display panel.

[0012] Based on the same inventive concept, embodiments of this application also provide a brightness compensation device for a display panel, used to implement the brightness compensation method for the display panel provided in the first aspect, including:

[0013] The acquisition module is used to acquire first brightness attenuation data of the display panel in the first luminous state, and second brightness attenuation data of the display panel driving the transistor device in the second luminous state.

[0014] The calculation module, connected to the acquisition module, is used to calculate net brightness attenuation data based on the first brightness attenuation data and the second brightness attenuation data, and to obtain brightness compensation data based on the net brightness attenuation data and the target brightness of the display panel.

[0015] A compensation signal generation module, connected to the computing module, is used to generate a compensation control signal based on the compensation brightness driving data;

[0016] A drive control module, connected to the compensation signal generation module and the drive transistor device of the display panel, is used to adjust the drive parameters of the drive transistor device based on the compensation control signal to compensate the brightness of the display panel.

[0017] Based on the same inventive concept, this application also provides a display panel, including:

[0018] Substrate,

[0019] A driving circuit layer, located on one side of the substrate, includes a pixel driving circuit, which includes a plurality of driving transistor devices;

[0020] The light emitter, located on the side of the driving circuit layer away from the substrate, includes multiple light-emitting devices; the driving transistor device is connected to the light-emitting devices; and the brightness compensation device for the display panel provided in this application.

[0021] Based on the same inventive concept, embodiments of this application also provide a display device, including the display panel provided in this application.

[0022] In summary, the brightness compensation method for display panels provided by this invention distinguishes between the irreversible degradation of light-emitting devices and the recoverable degradation of driving transistor devices. During brightness compensation, the recoverable degradation of driving transistor devices is excluded, and compensation is only performed on the efficiency degradation of the irreversible light-emitting devices. This avoids the overcompensation problem caused by including the degradation of recoverable driving transistor devices in the compensation, thereby effectively slowing down the rate of brightness lifespan decay and extending the service life of the display panel. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a module in an existing method for collecting brightness lifetime data of an OLED display panel.

[0024] Figure 2 This is a graph showing the brightness decay of an OLED display panel over time in the prior art.

[0025] Figure 3 A schematic flowchart of a brightness compensation method for a display panel provided by the present invention;

[0026] Figure 4 A schematic diagram of the structure of a display panel provided by the present invention;

[0027] Figure 5 This is a schematic diagram of the first sampling period and the second sampling period in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the first brightness attenuation data acquisition process in an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the circuit structure of a pixel driving circuit provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of another display panel provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the structure of a display device provided by the present invention. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the present application and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure. Various modifications and variations can be made to the present application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, the present application is intended to cover modifications and variations of the present application that fall within the scope of the technical solutions claimed in the corresponding claims and their equivalents. It should be noted that the implementation methods provided in the embodiments of the present application can be combined with each other without contradiction.

[0033] Research has revealed that the brightness degradation of OLED display panels is primarily caused by two factors: the efficiency degradation of the light-emitting devices (OLED devices) and the efficiency degradation of the driving transistor devices (TFT devices). The efficiency degradation of the light-emitting devices is irreversible due to the irreversible deterioration of the light-emitting materials (such as organic or quantum dot materials) after prolonged operation. During long-term illumination, the luminous efficiency gradually decreases and cannot be recovered even after emitting light. In contrast, the efficiency degradation of the driving transistor devices mainly involves the drift of the threshold voltage (Vth), which increases with usage time. This is considered recoverable degradation; the threshold voltage of the driving transistor device will drift under long-term stress, but some of its performance can be recovered after a period of inactivity (such as after power-off).

[0034] Based on this, embodiments of the present invention provide a brightness compensation method for a display panel. This brightness compensation method acquires first brightness attenuation data of the display panel in a first light-emitting state and second brightness attenuation data of the display panel in a second light-emitting state. Based on the first brightness attenuation data and the second brightness attenuation data, net brightness attenuation data is calculated. The net brightness attenuation data is used to characterize the irreversible brightness attenuation caused by the efficiency decay of the light-emitting device. Based on the net brightness attenuation data and the target brightness of the display panel, brightness compensation data is obtained, and a compensation control signal is generated to adjust the driving parameters of the driving transistor device to compensate for the brightness of the display panel.

[0035] By employing the above technical solution, this invention collects brightness decay data of the display panel under different light-emitting states, obtaining total brightness decay data (first brightness decay data) including both types of efficiency decay and brightness decay data containing only the efficiency decay of the driving transistor devices (second brightness decay data). The second brightness decay data, which includes recoverable brightness decay, is then discarded to obtain pure light-emitting device efficiency decay data (net brightness decay data). This data serves as the basis for brightness compensation, enabling precise compensation of display brightness. Brightness compensation only addresses the irrecoverable efficiency decay of the light-emitting devices, avoiding overcompensation caused by including recoverable driving transistor device decay in the compensation. This effectively slows down the rate of brightness decay and extends the lifespan of the display panel.

[0036] The above is the core idea of ​​this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0037] Figure 3 This is a schematic flowchart of a brightness compensation method for a display panel provided by the present invention. Figure 4 This is a schematic diagram of the structure of a display panel provided by the present invention. Figure 5 This is a schematic diagram of the circuit structure of a pixel driving circuit provided in an embodiment of the present invention, for reference. Figures 3-5 This application provides a display panel and a brightness compensation method for the display panel. The brightness compensation method only compensates for the efficiency decay of the light-emitting device that cannot be recovered, and eliminates the decay of the driving transistor device that can be recovered, thereby avoiding the problem of overcompensation. It can effectively slow down the decay rate of brightness life and extend the service life of the display panel.

[0038] In this embodiment, the display panel 200 can be a liquid crystal display (LCD), an organic light-emitting diode (OLED) display panel, or a micro LED display panel, etc. This embodiment does not limit the type of display panel. Figure 4 As shown, this application uses an OLED display panel as an example for illustrative purposes only, and the structure of this display panel 200 does not constitute a limitation of this application. (In conjunction with...) Figure 4 and Figure 5 As shown, the display panel 200 provided in this embodiment includes a substrate 201, a driving circuit layer 202 located on one side of the substrate 201, and a light-emitting functional layer 203 located on the side of the driving circuit layer 202 away from the substrate 201. The driving circuit layer 202 includes a pixel driving circuit (…). Figure 4(Not shown in the image) is used to provide driving signals to the light-emitting device 20. The pixel driving circuit includes multiple driving transistor devices (TFTs). The light-emitting functional layer 203 includes multiple light-emitting devices 20; the driving transistor devices (TFTs) are connected to the light-emitting devices 20; the display panel 200 also includes a brightness compensation device for the display panel provided in the following embodiments. The substrate 201 can be a flexible substrate or a rigid substrate.

[0039] Specifically, in combination Figure 3 and Figure 4 As shown, the brightness compensation method for the display panel provided in this application embodiment includes:

[0040] S101. Obtain the first brightness attenuation data of the display panel in the first luminous state.

[0041] The first luminous state refers to the luminous state of the display panel under normal display conditions. In this state, both the light-emitting device 20 and the driving transistor device TFT are operational, and the efficiency degradation of both leads to a decrease in display brightness. The first brightness degradation data characterizes the total brightness degradation caused by the combined effects of light-emitting device efficiency degradation and driving transistor efficiency degradation. The brightness degradation data includes luminous duration and brightness value.

[0042] Specifically, within a preset sampling period, the actual brightness value and brightness decay data of each light-emitting device 20 can be acquired, and a brightness decay curve as a function of light emission time can be plotted. Combined with the pre-stored theoretical display brightness curve corresponding to the light emission duration of the light-emitting device, the degree of brightness decay of the light-emitting device at the current moment can be calculated. The theoretical display brightness curve corresponding to the light emission duration of the light-emitting device can be obtained and stored in the driver chip of the display panel during the pre-shipment testing phase.

[0043] S102. Obtain the second brightness attenuation data of the display panel in the second luminous state.

[0044] The second light-emitting state refers to the light-emitting state of the display panel during a specific detection stage. The light-emitting duration of the light-emitting device 20 in the second light-emitting state is shorter than that in the first light-emitting state. At this time, the light-emitting duration of the light-emitting device 20 is greatly compressed, so the degradation of the light-emitting device itself can be ignored. The second brightness decay data is used to characterize the recoverable brightness decay caused solely by the efficiency decay of the driving transistor device.

[0045] For example, this application can reduce the light-emitting time of the light-emitting device 20 to quickly illuminate and detect the brightness of the light-emitting device 20, thereby achieving the detection of recoverable brightness decay of the driving transistor device. Specifically, within a preset sampling period, by illuminating the light-emitting device 20 and reducing its light-emitting time, the brightness decay data of the light-emitting device 20 caused solely by the efficiency decay of the driving transistor device within the sampling period can be obtained. This data, combined with a pre-stored theoretical display brightness curve of the light-emitting device, allows for the calculation of the degree of brightness decay of the light-emitting device at the current moment. The theoretical display brightness curve of the light-emitting device can be obtained and stored in the driver chip of the display panel during the pre-shipment testing phase.

[0046] S103. Calculate the net brightness decay data based on the first brightness decay data and the second brightness decay data; the net brightness decay data is used to characterize the irreversible brightness decay caused by the decay of the light-emitting device efficiency.

[0047] Specifically, for the total brightness decay data (first brightness decay data) which includes both types of efficiency degradation and the brightness decay data (second brightness decay data) which only includes the efficiency degradation of the driving transistor device, the two sets of data can be differentially processed to extract the light-emitting device efficiency degradation data from the total brightness decay data, which is then used as the net brightness decay data. This data can accurately reflect the brightness loss caused by irreversible degradation of organic light-emitting materials or quantum dot light-emitting materials, without being affected by the drift of the electrical characteristics of the driving transistor device.

[0048] S104. Based on the net brightness attenuation data and the target brightness of the display panel, obtain brightness compensation data and generate a compensation control signal to adjust the driving parameters of the driving transistor device to compensate the brightness of the display panel.

[0049] Furthermore, this application can combine existing linear mapping of current-brightness characteristics, piecewise interpolation, or adaptive PID adjustment algorithms to convert net brightness attenuation data into specific brightness compensation data, such as drive voltage increments, data voltage correction values, or pulse width modulation (PWM) duty cycle adjustments. Based on this, the system generates corresponding compensation control signals from the brightness compensation data and transmits them to the pixel drive circuit of the display panel via the drive interface. This enables real-time or frame-by-frame adjustment of key drive parameters of the TFT (Through-Function Transistor), thereby achieving precise brightness compensation for the display panel. The drive parameters of the TFT include gate data voltage, source drive current, or conduction time.

[0050] It is important to emphasize that this application directly applies the brightness compensation data to the driving parameters of the driving transistor device, enabling it to provide a higher driving current in subsequent light-emitting stages to offset the brightness loss caused by the decrease in the efficiency of the light-emitting material. By using the net brightness attenuation data obtained from the above calculation for brightness compensation, the display panel can consistently approach the target brightness during long-term use, effectively suppressing brightness attenuation caused by material aging, while avoiding over-compensation or under-compensation caused by the drift recovery characteristics of the driving transistor device, thereby improving the display uniformity and reliability of the display panel.

[0051] In summary, this application distinguishes between the irreversible degradation of light-emitting devices and the recoverable degradation of driving transistor devices. When compensating for brightness, it only compensates for the efficiency degradation of irreversible light-emitting devices, avoiding the overcompensation problem caused by including the degradation of recoverable driving transistor devices in the compensation. This effectively slows down the rate of brightness lifespan decay and extends the service life of the display panel.

[0052] Optionally, the formula for calculating the net luminance attenuation data is: .

[0053] Where Dnet(t) is the net brightness decay data, Dtotal(t) is the first brightness decay data, DTFT(t) is the second brightness decay data, and k is the preset compensation weight coefficient.

[0054] In this embodiment, a compensation weighting coefficient k is introduced when calculating the net brightness decay data. k can be adjusted according to the operating temperature of the display panel. In the above calculation formula, DTFT(t) is the decay of the "pure" driving transistor device measured under conditions where the light-emitting device is almost not consumed. However, in actual display conditions, the recoverability of the driving transistor device decay is also affected by factors such as temperature, stress, and device aging. Therefore, directly subtracting at a 1:1 ratio (i.e., directly subtracting DTFT(t)) may result in inaccurate subtraction; excessive subtraction will lead to insufficient compensation (undercompensation), while insufficient subtraction will still result in overcompensation. Therefore, this embodiment can reasonably set the compensation weighting coefficient k by considering the brightness compensation effect, combined with factors such as temperature, stress, and device aging.

[0055] Optionally, the compensation weighting coefficient k ranges from 0.5 to 1.0. As an example, k is 0.9. For instance, when the operating temperature is high, the threshold voltage drift of the driving transistor device increases, and the proportion of recoverable decay in the total decay increases accordingly; in this case, the value of k can be appropriately increased. When the operating temperature is low, the value of k can be appropriately decreased. This application, by introducing a compensation weighting coefficient k (ranging from 0.5 to 1.0), can flexibly adjust the deduction ratio according to the actual operating temperature or device characteristics, accurately separating the recoverable portion caused by the decay of the driving transistor device from the total brightness decay data. This makes the final net brightness decay data Dnet(t) closer to the actual unrecoverable decay of the light-emitting device, thereby further improving the accuracy of brightness compensation, avoiding overcompensation or undercompensation, and thus extending the lifespan of the display panel.

[0056] Based on the above embodiments, refer to Figure 4 Driving crystal devices include field-effect transistors (FETs), and driving parameters include driving voltage. FETs are transistors used in the pixel driving circuit of display panels to drive light-emitting devices (such as OLEDs), such as thin-film transistors (TFTs). The conduction current between the source (S) and drain (D) is controlled by applying a voltage to the gate (G). These FETs are voltage-controlled devices; their output current (i.e., the driving current of the light-emitting device) has a definite functional relationship with the gate (G) and source (S) voltages, making them suitable for precisely controlling the brightness of light emitted by adjusting the gate voltage.

[0057] In the brightness compensation method described in this invention, the driving voltage is used as a data parameter to adjust the output capability of the driving transistor. Specifically, the driving voltage is the data voltage (Vdata) applied to the gate G of the field-effect transistor or the compensated gate bias voltage. By changing the driving voltage, the magnitude of the driving current flowing through the light-emitting device 20 can be adjusted, thereby compensating for the decrease in brightness caused by the degradation of the light-emitting device efficiency.

[0058] Based on the above embodiments, taking the driving crystal device as a field-effect transistor and the driving parameter as the driving voltage as an example, the steps for calculating the net brightness attenuation data and brightness compensation data include:

[0059] Based on the brightness decay curve and the target brightness, the mapping relationship between brightness and driving voltage, the first compensation driving voltage corresponding to the first brightness decay data and the second compensation driving voltage corresponding to the second brightness decay data are obtained.

[0060] The first and second brightness attenuation data include the acquisition time, brightness value, and driving voltage. Specifically, embodiments of this application can establish a complete brightness attenuation dataset for the display panel by recording multi-dimensional data such as acquisition time, brightness value, and driving voltage, providing sufficient data support for subsequent data processing, curve fitting, and compensation calculations.

[0061] Specifically, in the above steps, the step of obtaining the first compensation driving voltage corresponding to the first brightness attenuation data includes:

[0062] S201. During the first sampling period, a threshold voltage is applied to the driving transistor device to drive the light-emitting device to emit light, and at the same time, the first brightness decay curve of the light-emitting device changing with time is obtained.

[0063] S202. Based on the first brightness attenuation curve and the target brightness, the mapping relationship between brightness and driving voltage, calculate the first compensation driving voltage for brightness changes over time.

[0064] For example, combined Figure 4 During the first sampling period, the display panel's driver chip applies a threshold voltage V to the driver transistor device. 阈 This drives the light-emitting device 20 to continuously emit light normally. A first brightness decay curve is obtained using a brightness measurement instrument to measure the brightness of the light-emitting device on the display panel over time. This first brightness decay curve reflects the total brightness decay caused by the combined effect of the light-emitting device efficiency decay and the driving transistor device efficiency decay. The brightness measurement instrument includes, but is not limited to, a luminance meter, a two-dimensional image sensor, a color analyzer, and a spectroradiometer.

[0065] Furthermore, based on the first brightness attenuation curve and the target brightness of the display panel, as well as the mapping relationship between brightness and driving voltage, the first compensation driving voltage V1 is calculated.

[0066] Specifically, in combination Figure 4 , Figure 5 Figure (a) and Figure 6 As shown, during the time period t0~tn, a threshold voltage V is applied to the driving transistor device. 阈 The light-emitting device is driven to emit light normally, and the first brightness decay curve W1 of the light-emitting device over time is recorded. For example, as shown... Figure 6As shown, within the sampling period of the time interval t0 to tn, the luminance gradually attenuates. At the initial time t0, the initial luminance is L0; at the time tn, the luminance attenuates to Ln. Further, taking the initial luminance L0 as the target luminance, the luminance attenuation amount ΔL1=L0−Ln is calculated. Then, in combination with the preset mapping relationship between luminance and driving voltage, the first compensation driving voltage V1 required to compensate the attenuated luminance from Ln back to the initial luminance L0 is calculated. The mapping relationship between luminance and driving voltage refers to the corresponding voltage value that the pixel driving circuit needs to provide to reach the target luminance, based on the type of the display panel, the light-emitting performance of the light-emitting element, and the like.

[0067] In other embodiments of the present application, the pre-stored display luminance Lx from the factory test of the display panel may also be taken as the target luminance, the luminance attenuation amount ΔL1'=Lx−Ln within the sampling period of the time interval t0 to tn is calculated, and then in combination with the preset mapping relationship between luminance and driving voltage, the first compensation driving voltage V1' required to compensate the attenuated luminance from Ln back to the target luminance Lx is calculated.

[0068] Wherein, the first compensation driving voltage is the compensation amount corresponding to the total attenuation, which is the total compensation amount obtained for the total luminance attenuation jointly caused by the efficiency attenuation of the light-emitting device and the efficiency attenuation of the driving transistor device, and serves as the basis for subsequent separation of the net compensation amount.

[0069] Specifically, the step of acquiring the second compensation driving voltage corresponding to the second luminance attenuation data includes:

[0070] S203. Perform luminance attenuation measurement on the driving transistor device within the second sampling period.

[0071] S204. Acquire a second luminance attenuation curve of the luminance of the driving transistor device varying with time in a plurality of sub-periods.

[0072] S205. Based on the second luminance attenuation curve, the target luminance, and the mapping relationship between luminance and driving voltage, obtain the second compensation driving voltage caused by the attenuation of the driving transistor device.

[0073] Wherein, referring to Figure 5 in figure (b), the second sampling period includes a plurality of sub-periods, and each sub-period includes a consecutive first time interval t1 and a second time interval t2 (t2<t1); within each sub-period, during the first time interval t1, a first driving voltage V is applied to the driving transistor device 01 , V 01 <V 阈, so the light-emitting device does not emit light, but the driving transistor is in a fatigue pressurization state, resulting in efficiency attenuation. In the second time period t2, a threshold voltage V0 is applied to the driving transistor device to briefly drive the light-emitting device to emit light, and the brightness at this time is obtained. By repeating n sub-periods in this way, a second brightness attenuation curve W2 of the brightness changing with time caused only by the attenuation of the driving transistor is obtained, as Figure 5 shown in the figure.

[0074] Wherein, the sampling period of the first brightness attenuation data is the same as the sampling period of the first brightness attenuation data. By setting the same sampling period in the present application, the first brightness attenuation data and the second brightness attenuation data correspond to each other on the same time scale, which facilitates data processing operations such as point-by-point subtraction, and ensures the accuracy and reliability of the calculation of the net brightness attenuation data.

[0075] Exemplarily, as shown in Figure 5 the diagram (b) in the figure, the time period from t0 to tn is divided into n sub-periods, a first driving voltage V is applied in the first time period t1 of each sub-period 01 , to put the driving transistor device in a fatigue pressurization state. In the second time period t2 (t2<t1), a threshold voltage V is applied to the driving transistor device 阈 , to drive the light-emitting device to emit light normally. After multiple sub-periodic tests, the second brightness attenuation curve W2 of the light-emitting device's light-emitting brightness changing with time is recorded, as Figure 6 shown in the figure.

[0076] At the initial time t0, the initial brightness is L1; at the time tn, the brightness attenuates to L2. Within the sampling period of the time period from t0 to tn, the brightness attenuation ΔL2=L1−L2 is calculated. Taking the initial brightness L1 as the target brightness, combined with the mapping relationship between brightness and driving voltage, the second compensation driving voltage V2 required to compensate the attenuated brightness from L2 to the initial brightness L1 is calculated.

[0077] In other embodiments of the present application, the display brightness Lx pre-stored in the factory test of the display panel may also be used as the target brightness, and within the sampling period of the time period from t0 to tn, the brightness attenuation ΔL2'=Lx−L2 is calculated. Combined with the mapping relationship between brightness and driving voltage, the second compensation driving voltage V2' required to compensate the attenuated brightness from L2 to the target brightness Lx is calculated.

[0078] In the present application, the light-emitting device is hardly operated within the first time period t1, so that the recoverable attenuation component of the driving transistor is separately extracted, and the interference of the light-emitting device attenuation is avoided.

[0079] S206: After the first compensation driving voltage V1 and the second compensation driving voltage V2 are obtained, the difference between the first compensation driving voltage V1 and the second compensation driving voltage V2 is calculated as the net brightness attenuation data.

[0080] Specifically, the net brightness decay data ∆v = V1−k×V2. The difference ∆v is the net brightness decay data used to characterize the irreversible brightness decay caused solely by the efficiency decay of the light-emitting device. k is a preset compensation weighting coefficient provided in the above embodiment, and the value of k ranges from 0.5 to 1.0. For example, k=1.

[0081] S207. The net brightness attenuation data is superimposed on the threshold voltage of the light-emitting device to obtain the final compensation driving voltage, and the final compensation driving voltage is used as the brightness compensation data.

[0082] Specifically, the final compensation drive voltage Vx = V 阈 +∆v. Vx is used as the brightness compensation data.

[0083] The display panel provided in this application embodiment also includes a driver ( Figure 4 (Not shown in the diagram), such as a data driver chip, the driving device is connected to the driving transistor device in the pixel driving circuit 10, and together they work to achieve display; details will not be elaborated here. The pixel driving circuit can be a 2T1C, 4T1C, 7T1C, 7T2C, 8T1C, 8T2C, etc. circuit structure; this application embodiment does not impose limitations. The pixel driving circuit includes driving transistor devices, switching transistors, and storage capacitors, etc. As one embodiment, Figure 7 This is a schematic diagram of the circuit structure of a pixel driving circuit provided in an embodiment of the present invention, as shown below. Figure 7 As shown, the embodiments in this application only use a 2T1C pixel driving circuit as an example for illustrative purposes and do not constitute a limitation of this application. The gate of the first driving transistor T1 is electrically connected to the gate line Gate, the first terminal is electrically connected to the data line Date, and the second terminal is electrically connected to the storage capacitor C and the gate of the second driving transistor T2. The first terminal of the second driving transistor T2 is electrically connected to the first voltage terminal PVDD, the second terminal is electrically connected to the anode of the light-emitting device 20, and the cathode of the light-emitting device 20 is electrically connected to the second voltage terminal PVEE. Combined with... Figure 4 and Figure 7 The working principle of the pixel driving circuit 10 is as follows:

[0084] During the data writing phase, the first driving transistor T1 is turned on, and the second driving transistor T2 is turned off. The gate line Gate inputs a scan signal Vgate to the first driving transistor T1, controlling the first driving transistor T1 to turn on. The data line Data inputs a data signal Vdata to the first terminal of the first driving transistor T1, and stores the data signal Vdata in the storage capacitor C through the second terminal.

[0085] During the light-emitting phase, the first driving transistor T1 is off, and the second driving transistor T2 is on. The data signal Vdata stored in the storage capacitor C controls the second driving transistor T2 to turn on. The first voltage terminal PVDD inputs the VDD signal to the first terminal of the second driving transistor T2, so that a path is formed between the first voltage terminal PVDD, the light-emitting device 20, and the second voltage terminal PVSS which is electrically connected to the cathode of the light-emitting device 20. The light-emitting device 20 emits light, and the display panel 200 displays the image.

[0086] Based on the brightness compensation method provided in the above embodiments, after calculating the brightness compensation data of the light-emitting device 20, the driving device of the display panel inputs the brightness compensation data (Vx) to the first terminal of the first driving transistor T1 through the data line Date. In the embodiments of this application, the first driving transistor T1 and the second driving transistor T2 can be thin-film transistors. The first terminal of the thin-film transistor is the source, and the second terminal is the drain; or, the first terminal of the thin-film transistor is the drain, and the second terminal is the source.

[0087] This embodiment of the application increases the data signal Vdata input to the data line Date, thereby increasing the voltage Vg input to the gate of the first driving transistor T1, and thus increasing Vgs (i.e., Vdata-VDD). According to the current formula, under the condition that the channel length L, channel width W, capacitance C, and first voltage terminal PVDD of the driving transistor remain unchanged, increasing the data signal Vdata can increase the driving current I of the light-emitting device 20. When the driving current I on the light-emitting device 20 increases, the brightness of the light-emitting device 20 increases compared to the brightness when it is decayed, thereby achieving precise control of the conduction degree of the driving transistor device, compensating for brightness loss, and achieving accurate compensation for the brightness of the display panel.

[0088] It should be emphasized that the voltage Vg input to the gate of the first driving transistor T1 in this application is the brightness decay compensation data (Vx) obtained after deducting the recoverable efficiency decay of the driving transistor device using the brightness compensation method provided in the above embodiment. In brightness compensation, only the efficiency decay of the light-emitting device that cannot be recovered is compensated, avoiding the overcompensation problem caused by including the decay of the recoverable driving transistor device in the compensation. This makes the brightness after compensation basically the same as the brightness before decay, thereby effectively slowing down the decay rate of brightness life and extending the service life of the display panel.

[0089] Figure 8 A schematic diagram of another display panel provided in an embodiment of this application, referred to... Figure 8In this embodiment, the data line Date is electrically connected to the first electrode of a column of first driving transistors T1, and the gate line Gate is electrically connected to the gate of a row of first driving transistors T1. During the display process, the gate line Gate scans multiple light-emitting devices 20 row by row. Based on this, this application can use the data line Date to individually compensate each row of light-emitting devices 20 after obtaining the brightness attenuation compensation data (Vx) during the scanning of each row of light-emitting devices 20, thereby achieving more accurate brightness compensation for the display panel.

[0090] In summary, this application achieves voltage compensation by adjusting the driving voltage of the field-effect transistor, rather than through direct current compensation. This results in more direct brightness compensation control and a faster response speed. This compensation method can work directly with existing functions such as threshold voltage compensation in pixel driving circuits without requiring large-scale modifications to the pixel driving circuit, demonstrating excellent compatibility. Furthermore, the compensation only targets the irreversible attenuation of light-emitting devices, avoiding overcompensation caused by recoverable attenuation, thus achieving precise brightness compensation and effectively extending panel lifespan.

[0091] Based on the above embodiments, the light-emitting device includes at least three light-emitting devices with different light-emitting colors, and the brightness compensation method of the display panel further includes: controlling the first light-emitting device of the same color to emit light respectively; when the first light-emitting device of the same color emits light, acquiring the first brightness attenuation data of the first light-emitting device of the same color; and the second brightness attenuation efficiency attenuation data of the driving transistor device connected to the first light-emitting device of the same color.

[0092] Since the material systems and luminous efficiency decay characteristics of different color light-emitting devices are different, the present invention can also control the light-emitting devices of the same color to emit light separately, obtain the first brightness decay data and the second brightness decay data corresponding to the color, and then calculate the brightness compensation data of each emitting color according to the above steps S101-S204 and S201-S207. The driving device is controlled to write the brightness compensation data of each color light-emitting device into the gate of its corresponding driving transistor device, thereby providing independent and accurate compensation for each color light-emitting device, avoiding color shift problems caused by the difference in decay between colors, and thus ensuring the color accuracy and display uniformity of the display panel.

[0093] Preferably, the present invention also establishes a brightness attenuation database, storing the mapping relationship between usage time, temperature, brightness value and various attenuation data. In practical applications, the compensation amount can be directly queried based on the current driving parameters, improving response speed and serving as a standardized compensation basis for products of the same model.

[0094] Based on the above embodiments, the brightness compensation method for the display panel provided in this application further includes:

[0095] Establish a brightness attenuation database and perform brightness compensation on the display panel based on the brightness attenuation database.

[0096] The brightness decay database is used to characterize the mapping relationship between the display panel's driving parameters and the first brightness decay data, the second brightness decay data, and the net brightness decay data; the driving parameters include usage time, temperature, and brightness value.

[0097] Specifically, this application embodiment establishes a brightness attenuation database, which stores the brightness attenuation characteristics of a specific display panel in the form of a data table or function. In subsequent use, the corresponding brightness compensation data can be directly queried or calculated from the database based on parameters such as current usage time, temperature, and brightness value, eliminating the need for complex real-time attenuation data collection and calculation. This improves response speed and serves as a standardized compensation basis for products of the same model. Furthermore, this database can also serve as a standard for brightness compensation for products of the same model, possessing significant industrialization value.

[0098] Based on the same inventive concept, this application also provides a brightness compensation device for a display panel, used to implement the brightness compensation method for the display panel provided in the above embodiments. The brightness compensation device for the display panel provided by this invention includes:

[0099] The acquisition module is used to acquire the first brightness decay data of the display panel in the first luminous state, and the second brightness decay data of the display panel driving the transistor device in the second luminous state.

[0100] The calculation module, connected to the acquisition module, is used to calculate the net brightness attenuation data based on the first brightness attenuation data and the second brightness attenuation data, and to obtain brightness compensation data based on the net brightness attenuation data and the target brightness of the display panel.

[0101] The compensation signal generation module, connected to the arithmetic module, is used to generate compensation control signals based on the compensation brightness drive data.

[0102] The drive control module is connected to the compensation signal generation module and the drive transistor device of the display panel. It is used to adjust the drive parameters of the drive transistor device based on the compensation control signal to compensate the brightness of the display panel.

[0103] The brightness compensation device for the display panel provided in this application embodiment, through the coordinated work of the acquisition module, the calculation module, the compensation signal generation module, and the drive control module, realizes the automatic acquisition of brightness decay data, the automatic calculation of net brightness decay data, and the generation and output of compensation control signals, forming a complete closed-loop brightness compensation. By distinguishing between the irreversible decay of light-emitting devices and the recoverable decay of driving transistor devices, the brightness compensation only targets the efficiency decay of irreversible light-emitting devices, avoiding the overcompensation problem caused by including the decay of recoverable driving transistor devices in the compensation, thereby effectively slowing down the decay rate of brightness life and extending the service life of the display panel.

[0104] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 9 This is a schematic diagram of a display device provided in an embodiment of the present invention. (In conjunction with...) Figure 9 As shown, the display device 300 includes any of the display panels 200 provided in the above embodiments. Therefore, the display device 300 also has the beneficial effects of the display panels 200 in the above embodiments. The similarities can be understood with reference to the explanation of the display panels 200 above, and will not be repeated below.

[0105] The display device 300 provided in this embodiment of the invention can be Figure 9 The vehicle display screen shown can also be any electronic product with display function, including but not limited to the following categories: mobile phones, televisions, laptops, desktop monitors, tablets, digital cameras, smart bracelets, smart glasses, industrial control equipment, medical displays, touch interactive terminals, etc. The embodiments of the present invention do not make any special limitations on this.

[0106] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Features of various embodiments of the present invention can be partially or wholly coupled or combined with each other, and can cooperate and be technically driven in various ways. Various obvious changes, readjustments, combinations, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A brightness compensation method for a display panel, the display panel comprising a light-emitting device and a driving transistor device connected to the light-emitting device; characterized in that, include: Obtain the first brightness attenuation data of the display panel in the first luminous state; The first brightness decay data is used to characterize the total brightness decay caused by the combined efficiency decay of the light-emitting device and the efficiency decay of the driving transistor device; Obtain the second brightness attenuation data of the display panel in the second luminous state; The second brightness decay data is used to characterize the recoverable brightness decay caused solely by the efficiency decay of the driving transistor device; wherein, the light emission duration of the light-emitting device in the second light emission state is less than the light emission duration of the light-emitting device in the first light emission state; Net brightness decay data is calculated based on the first brightness decay data and the second brightness decay data; the net brightness decay data is used to characterize the irreversible brightness decay caused by the efficiency decay of the light-emitting device. Based on the net brightness attenuation data and the target brightness of the display panel, brightness compensation data is obtained, and a compensation control signal is generated to adjust the driving parameters of the driving transistor device to compensate the brightness of the display panel.

2. The brightness compensation method according to claim 1, characterized in that, The formula for calculating the net brightness attenuation data is: ； Wherein, Dnet(t) is the net brightness attenuation data, Dtotal(t) is the first brightness attenuation data, DTFT(t) is the second brightness attenuation data, and k is a preset compensation weight coefficient.

3. The brightness compensation method according to claim 2, characterized in that, The value range of the compensation weight coefficient k is 0.5 to 1.

0.

4. The brightness compensation method according to claim 1, characterized in that, The driving crystal device includes a field-effect transistor; The driving parameters include the driving voltage, and the steps for calculating the net brightness attenuation data and brightness compensation data include: Based on the brightness decay curve and the target brightness, the mapping relationship between brightness and driving voltage, the first compensation driving voltage corresponding to the first brightness decay data and the second compensation driving voltage corresponding to the second brightness decay data are obtained. The difference between the first compensation driving voltage and the second compensation driving voltage is calculated and used as the net brightness attenuation data. The net brightness attenuation data is superimposed on the threshold voltage of the light-emitting device to obtain the final compensation driving voltage, which is then used as the brightness compensation data.

5. The brightness compensation method according to claim 4, characterized in that, The step of obtaining the first compensation driving voltage corresponding to the first brightness attenuation data includes: During the first sampling period, a threshold voltage is applied to the driving transistor device to drive the light-emitting device to emit light; a first brightness decay curve of the light-emitting device over time is obtained; Based on the first brightness attenuation curve and the target brightness, the mapping relationship between brightness and driving voltage is used to calculate the first compensation driving voltage for brightness changes over time.

6. The brightness compensation method according to claim 4, characterized in that, The step of obtaining the second compensation driving voltage corresponding to the second brightness attenuation data includes: During the second sampling period, the brightness attenuation of the driving transistor device is measured; the second sampling period includes multiple sub-periods, each sub-period including a continuous first time period and a second time period; during each sub-period, in the first time period, a first driving voltage is applied to the driving transistor device to prevent the light-emitting device from emitting light; in the second time period, a threshold voltage is applied to the driving transistor device to drive the light-emitting device to emit light; Obtain the second brightness decay curve of the driving transistor device over time in multiple sub-cycles; Based on the second brightness decay curve and the target brightness, the mapping relationship between brightness and driving voltage, the second compensation driving voltage caused by the decay of the driving transistor device is obtained.

7. The brightness compensation method according to claim 6, characterized in that, The first driving voltage is less than the threshold voltage; the second time period is less than the first time period.

8. The brightness compensation method according to claim 4, characterized in that, The sampling period of the first brightness attenuation data is the same as that of the first brightness attenuation data.

9. The brightness compensation method according to claim 4, characterized in that, The display panel further includes a driving device, which is connected to the driving transistor device; The step of adjusting the driving parameters of the driving transistor device includes: The control driver device writes the brightness compensation data into the gate of the driving transistor device.

10. The brightness compensation method according to claim 1, characterized in that, The light-emitting device includes at least three light-emitting devices with different emitting colors, and the brightness compensation method of the display panel further includes: Each of the first light-emitting devices of the same color is controlled to emit light. When the first light-emitting device of the same color emits light, the first brightness attenuation data of the first light-emitting device of the same color is obtained; and the second brightness attenuation efficiency attenuation data of the driving transistor device connected to the first light-emitting device of the same color is obtained.

11. The brightness compensation method according to claim 4, characterized in that, The first brightness attenuation data and the second brightness attenuation data include the acquisition time, brightness value and driving voltage.

12. The brightness compensation method according to claim 1, characterized in that, Also includes: Establish a brightness attenuation database, and perform brightness compensation on the display panel based on the brightness attenuation database; The brightness attenuation database is used to characterize the mapping relationship between the driving parameters of the display panel and the first brightness attenuation data, the second brightness attenuation data and the net brightness attenuation data; the driving parameters include usage time, temperature and brightness value.

13. A brightness compensation device for a display panel, used to implement the brightness compensation method for the display panel according to any one of claims 1-12, characterized in that, include: The acquisition module is used to acquire first brightness attenuation data of the display panel in the first luminous state, and second brightness attenuation data of the display panel driving the transistor device in the second luminous state. The calculation module, connected to the acquisition module, is used to calculate net brightness attenuation data based on the first brightness attenuation data and the second brightness attenuation data, and to obtain brightness compensation data based on the net brightness attenuation data and the target brightness of the display panel. A compensation signal generation module, connected to the computing module, is used to generate a compensation control signal based on the compensation brightness driving data; A drive control module, connected to the compensation signal generation module and the drive transistor device of the display panel, is used to adjust the drive parameters of the drive transistor device based on the compensation control signal to compensate the brightness of the display panel.

14. A display panel, characterized in that, include: Substrate, A driving circuit layer, located on one side of the substrate, includes a pixel driving circuit, which includes a plurality of driving transistor devices; A light-emitting functional layer, located on the side of the driving circuit layer away from the substrate, includes multiple light-emitting devices; the driving transistor device is connected to the light-emitting devices; as well as The brightness compensation device for the display panel as described in claim 13.

15. A display device, characterized in that, Includes the display panel as described in claim 14.

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