Brightness degradation compensation method, brightness degradation compensation device, and display device

Abstract

The application provides a brightness decay compensation method, a brightness decay compensation device and a display device. The brightness decay compensation method comprises the following steps: obtaining a brightness decay degree of an organic electroluminescent diode at a starting moment of a current time period; calculating a target current density flowing through the organic electroluminescent diode in the current time period; obtaining a brightness decay degree of the organic electroluminescent diode in the current time period based on the brightness decay degree of the organic electroluminescent diode at the starting moment of the current time period and the target current density; and performing brightness compensation on the organic electroluminescent diode according to the brightness decay degree of the organic electroluminescent diode in the current time period, so that targeted compensation can be performed and the display uniformity of the display device is improved.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a brightness decay compensation method, a brightness decay compensation device, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) displays are widely used in the display field due to their self-emissive nature, simple structure, ultra-thinness, fast response time, wide viewing angle, low power consumption, and ability to achieve flexible displays. However, the brightness characteristics of organic materials gradually degrade over time, directly affecting the lifespan of the display device.

[0003] The brightness decay model for organic light-emitting diodes is generally considered to be: f(t) = exp(-(t / τ)). β ), where τ is the decay time constant of the organic light-emitting diode, β is the current density flowing through the organic light-emitting diode, and t is the duration.

[0004] The conventional solution to compensate for brightness degradation is to continuously accumulate the working time of the display device by the display driver chip, and then calculate the current degree of brightness degradation in real time according to the above model, thereby increasing the current intensity of the final driver organic light-emitting diode to compensate for the brightness degradation.

[0005] However, the constants τ and β are calculated using fixed values. τ can have a fixed value for the same luminescent material, but β is related to the current density flowing through the organic light-emitting diode, which in turn is related to the display screen. During the operation of the display device, the driving current of each sub-pixel continuously changes, so existing solutions inevitably suffer from distortion in calculating the degree of brightness degradation. Furthermore, because the driving current change experienced by each sub-pixel is different, conventional methods cannot calculate the degree of brightness degradation for each sub-pixel individually. Consequently, sub-pixels with different actual degrees of degradation are mistakenly assumed to have the same degree of degradation, thus using the same compensation value, ultimately leading to uneven display. Summary of the Invention

[0006] This application provides a brightness decay compensation method, a brightness decay compensation device, and a display device, which can compensate the brightness of organic light-emitting diodes, thereby improving the display uniformity of the display device.

[0007] In a first aspect, this application provides a brightness decay compensation method, which includes:

[0008] Obtain the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period;

[0009] Calculate the target current density flowing through the organic light-emitting diode during the current time period;

[0010] The degree of brightness decay of the organic light-emitting diode (OLED) during the current time period is obtained based on the degree of brightness decay at the start of the current time period and the target current density; and

[0011] Brightness compensation is performed on the organic light-emitting diode (OLED) based on the degree of brightness decay during the current time period.

[0012] In the brightness decay compensation method provided in this application, the step of calculating the target current density flowing through the organic light-emitting diode during the current time period includes:

[0013] Obtain each current density flowing through the organic light-emitting diode within the current time period and the duration corresponding to each current density;

[0014] The target current density flowing through the organic light-emitting diode during the current time period is obtained based on each of the current densities and each of the durations.

[0015] In the brightness decay compensation method provided in this application,

[0016]

[0017] Where βave is the target current density flowing through the organic light-emitting diode during the current time period, Δt is the duration of the current time period, and β i t is a current density flowing through the organic light-emitting diode during the current time period. i The duration of a current density.

[0018] In the brightness decay compensation method provided in this application, the current density corresponds to at least one display gray level.

[0019] In the brightness decay compensation method provided in this application, the number of display gray levels corresponding to the current density gradually decreases from low gray level to high gray level.

[0020] In the brightness decay compensation method provided in this application, the step of obtaining the brightness decay degree of the organic light-emitting diode during the current time period based on the brightness decay degree of the organic light-emitting diode at the start time of the current time period and the target current density includes:

[0021] The equivalent decay time of the organic electroluminescent diode in the current time period is obtained based on the degree of brightness decay of the organic electroluminescent diode at the start of the current time period and the target current density;

[0022] The degree of brightness degradation of the organic light-emitting diode in the current time period is obtained based on the equivalent decay time and the target current density.

[0023] In the brightness decay compensation method provided in this application, Where τ is the decay time constant of the organic electroluminescent diode, and β ave f0 is the target current density flowing through the organic light-emitting diode during the current time period, f0 is the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period, and t0 is the equivalent decay time of the organic light-emitting diode during the current time period.

[0024] In the brightness decay compensation method provided in this application,

[0025]

[0026] Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 is the target current density flowing through the organic light-emitting diode during the current time period, t0 is the equivalent decay time of the organic light-emitting diode during the current time period, Δt is the duration of the current time period, and f1 is the degree of brightness decay of the organic light-emitting diode during the current time period.

[0027] In the brightness decay compensation method provided in this application, the step of compensating the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay during the current time period includes:

[0028] Obtain the input grayscale;

[0029] The driving current value corresponding to the input gray level is obtained from the gray level-current mapping table.

[0030] The actual driving current value is obtained based on the driving current value and the degree of brightness decay of the organic electroluminescent diode during the current time period.

[0031] The display grayscale corresponding to the actual driving current value is obtained from the current-grayscale mapping table.

[0032] In the brightness decay compensation method provided in this application, the step of compensating the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay during the current time period includes:

[0033] Obtain the input grayscale;

[0034] The driving current value corresponding to the input gray level is obtained from the gray level-current mapping table.

[0035] The actual driving current value is obtained based on the driving current value and the degree of brightness decay of the organic electroluminescent diode during the current time period.

[0036] Drive the corresponding LED according to the actual driving current value.

[0037] Secondly, this application also provides a brightness decay compensation device, which includes:

[0038] The acquisition module is used to acquire the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period;

[0039] The calculation module calculates the target current density flowing through the organic light-emitting diode during the current time period;

[0040] The processing module is configured to obtain the degree of brightness decay of the organic light-emitting diode during the current time period based on the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period and the target current density;

[0041] A compensation module is provided to compensate the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay of the OLED during the current time period.

[0042] Thirdly, this application also provides a display device, which includes a display panel and a timing controller electrically connected to the display panel, the timing controller being used to perform the brightness decay compensation method described above.

[0043] The brightness decay compensation method, brightness decay compensation device, and display device provided in this application obtain the brightness decay degree of an organic light-emitting diode (OLED) at the beginning of a current time period; calculate the target current density flowing through the OLED during the current time period; obtain the brightness decay degree of the OLED during the current time period based on the brightness decay degree of the OLED at the beginning of the current time period and the target current density; and perform brightness compensation on the OLED according to the brightness decay degree of the OLED during the current time period, thereby enabling targeted compensation and improving the display uniformity of the display device. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of the display device provided in the embodiments of this application;

[0045] Figure 2 for Figure 1 The schematic circuit diagram of the sub-pixel is shown.

[0046] Figure 3 A schematic flowchart illustrating the brightness decay compensation method provided in this application embodiment;

[0047] Figure 4 A schematic diagram of the brightness decay curve of an organic light-emitting diode provided in an embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the specific process of step 20 in the brightness decay compensation method provided in the embodiments of this application;

[0049] Figure 6 This is a schematic diagram showing the correspondence between current density and display grayscale.

[0050] Figure 7 A schematic diagram illustrating the specific process of step 30 in the brightness decay compensation method provided in the embodiments of this application;

[0051] Figure 8 A schematic diagram of the specific process of step 40 in the brightness decay compensation method provided in the embodiments of this application;

[0052] Figure 9 A schematic illustration of step 40 in the brightness decay compensation method provided in the embodiments of this application;

[0053] Figure 10 Another specific flowchart of step 40 in the brightness decay compensation method provided in the embodiments of this application;

[0054] Figure 11 This is a schematic diagram of the brightness decay compensation device provided in an embodiment of this application. Detailed Implementation

[0055] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0056] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the display device provided in an embodiment of this application. It should be noted that... Figure 1 The display device shown is merely an illustrative illustration, intended to demonstrate that the brightness decay compensation method provided in the embodiments of this application can be used in the display device.

[0057] like Figure 1 As shown, the display device provided in this application embodiment includes an image processor 110, a timing controller 120, a data driver 130, a scan driver 140, and a display panel 150.

[0058] The image processor 110 outputs a data enable signal DE and an externally provided data signal DATA. In addition to the data enable signal DE, the image processor 110 may output one or more of the following signals: a vertical synchronization signal, a horizontal synchronization signal, and a clock signal. For ease of illustration, these signals are omitted from the accompanying drawings.

[0059] The timing controller 120 receives a data signal DATA and a data enable signal DE, or a drive signal including a vertical synchronization signal, a horizontal synchronization signal, and a clock signal, from the image processor 110. Based on the drive signal, the timing controller 120 outputs a gate timing control signal GDC for controlling the operating timing of the scan driver 140 and a data timing control signal DDC for controlling the operating timing of the data driver 130.

[0060] Data driver 130, in response to the data timing control signal DDC provided from timing controller 120, samples and latches the data signal DATA provided from timing controller 120, converts this signal into a gamma reference voltage, and outputs it. Data driver 130 provides data lines DL1 to DLn to output the data signal DATA. Data driver 130 may be provided in the form of an IC (integrated circuit).

[0061] The scan driver 140 responds to the gate timing control signal GDC provided from the timing controller 120, and outputs a scan signal while shifting the level of the gate voltage. The scan driver 140 outputs the scan signal through scan lines GL1 to GLm. The scan driver 140 may be provided in the form of an IC (integrated circuit) or may be disposed on the display panel 150 as an in-panel gate.

[0062] Display panel 150 displays an image in response to data signals DATA and scan signals provided from data driver 130 and scan driver 140, respectively. Display panel 150 includes subpixels SP for displaying the image. Subpixels SP may include red subpixels, green subpixels, and blue subpixels, or may include white subpixels, red subpixels, green subpixels, and blue subpixels.

[0063] For further details, please refer to Figure 2 , Figure 2 Figure 2 for Figure 1 The diagram shown is a schematic circuit diagram of a sub-pixel. It should be noted that... Figure 2 The sub-pixels shown are merely illustrative. It is understood that sub-pixels include organic light-emitting diodes.

[0064] like Figure 2 As shown, a sub-pixel includes a switching transistor SW, a driving transistor DR, a capacitor Cst, and an organic light-emitting diode (OLED). The switching transistor SW acts as a switch in response to a scan signal provided via a first scan line GL1, storing a data signal provided via a first data line DL1 as a data voltage in the capacitor Cst. The driving transistor DR is used to cause a driving current to flow between a first power line EVDD and a second power line EVSS according to the data voltage stored in the capacitor Cst. The organic light-emitting diode (OLED) emits light according to the driving current generated by the driving transistor DR. Of course, in some embodiments, the sub-pixel may also include a compensation circuit; the compensation circuit is a circuit added within the sub-pixel to compensate for threshold voltages, etc., of the driving transistor DR. The compensation circuit may consist of one or more transistors.

[0065] Please see Figure 3 , Figure 3 This is a schematic flowchart illustrating the brightness decay compensation method provided in an embodiment of this application. This brightness decay compensation method can be applied to the display devices described above. Figure 3 As shown, the specific process of the brightness decay compensation method provided in this application embodiment can be as follows:

[0066] 10. Obtain the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period.

[0067] The brightness degradation degree characterizes the ratio of the current luminous intensity of an organic light-emitting diode (OLED) to its original luminous intensity under the same current. The brightness degradation degree is a value between 0 and 1. Generally, as an organic light-emitting diode is used, the brightness degradation degree gradually decreases from 1. For example, please refer to... Figure 4 , Figure 4 This is a schematic diagram illustrating the brightness decay curve of an organic light-emitting diode provided in an embodiment of this application. Figure 4 As shown, at time t0, the organic light-emitting diode (OLED) shows no degradation; at this time, the brightness degradation of the OLED is 1.

[0068] During the time interval from t0 to t1, the degree of brightness degradation of the organic light-emitting diode (OLED) corresponds to the β1 curve in the figure. The degree of brightness degradation of the OLED at time t1 can be determined as L1 based on the β1 curve.

[0069] The degree of brightness degradation of the organic light-emitting diode (OLED) during the time period from t1 to t2 corresponds to the β2 curve in the figure. The degree of brightness degradation of the OLED at time t2 can be determined as L2 based on the β2 curve.

[0070] The degree of brightness degradation of the organic light-emitting diode (OLED) during the time period from t2 to t3 corresponds to the β3 curve in the figure. The degree of brightness degradation of the OLED at time t3 can be determined as L3 based on the β3 curve.

[0071] The degree of brightness degradation of the organic light-emitting diode (OLED) during the time period from t3 to t4 corresponds to the β4 curve in the figure. The degree of brightness degradation of the OLED at time T4 can be determined as L4 based on the β4 curve.

[0072] The degree of brightness degradation of the organic light-emitting diode (OLED) during the period from t4 to t5 corresponds to the β5 curve in the figure. The degree of brightness degradation of the OLED at time t5 can be determined as L5 based on the β5 curve.

[0073] It should be noted that the brightness decay level of the organic light-emitting diode (OLED) at the beginning of the current time period can be pre-stored in the display device and automatically updated as the OLED is used. For example, during the time period from t0 to t1, the brightness decay level of the OLED is initially set to 1 and stored in the display device. As the OLED is used, the brightness decay level is updated to L1 in time period t1, to L2 in time period t2, to L3 in time period t3, to L4 in time period t4, and to L5 in time period t5.

[0074] Step 20: Calculate the target current density flowing through the organic light-emitting diode during the current time period.

[0075] Within the current time period, the organic light-emitting diode (OLED) corresponds to multiple current densities, each lasting for a certain duration. The target current density can be calculated based on multiple current densities and their durations according to a preset rule. This preset rule can be adjusted as needed.

[0076] In some implementations, please refer to Figure 5 , Figure 5 This is a schematic diagram illustrating the specific process of step 20 in the brightness decay compensation method provided in the embodiments of this application. Figure 5 As shown, the steps for calculating the target current density flowing through the organic light-emitting diode in the current time period include the following specific procedures:

[0077] Step 201: Obtain the current density flowing through the organic light-emitting diode and the duration corresponding to each current density within the current time period.

[0078] Step 202: Obtain the target current density flowing through the organic light-emitting diode in the current time period based on each current density and each duration.

[0079] The formula for calculating the target current density is as follows:

[0080]

[0081] , where β ave β represents the target current density flowing through the organic light-emitting diode during the current time period, Δt represents the duration of the current time period, and β represents the current current density. i t represents a current density flowing through the organic light-emitting diode during the current time period. i The duration of a current density.

[0082] It should be noted that the current density can correspond to at least one display grayscale level. In some embodiments, the current density corresponds to one display grayscale level, which can result in better compensation. In other embodiments, it is not necessary for each display grayscale level to correspond to a single current density; instead, the current density can correspond to multiple display grayscale levels, thereby reducing costs.

[0083] Of course, this application can also use other methods to obtain the target current density flowing through the organic light-emitting diode in the current time period. For example, the median value of multiple current densities in the current time period can be obtained, and this median value can be used as the target current density flowing through the organic light-emitting diode in the current time period. Another example is using the maximum value, minimum value, or any value as the target current density flowing through the organic light-emitting diode in the current time period.

[0084] For details, please refer to Figure 6 , Figure 6 This is a schematic diagram illustrating the correspondence between current density and displayed grayscale. For example... Figure 6 As shown, the number of display gray levels corresponding to the current density gradually decreases from low gray levels to high gray levels. That is, a common typical current density can be used to reduce the size of the summation logic by using segments. Because the brightness decays faster under high current at high gray levels than under low current at low gray levels, it is generally advisable to use denser segments for high gray levels and sparser segments for low gray levels.

[0085] For example, the number of display gray levels corresponding to current density β1 is greater than the number of display gray levels corresponding to current density β2, the number of display gray levels corresponding to current density β2 is greater than the number of display gray levels corresponding to current density β3, the number of display gray levels corresponding to current density β3 is greater than the number of display gray levels corresponding to current density β4, the number of display gray levels corresponding to current density β4 is greater than the number of display gray levels corresponding to current density β5, the number of display gray levels corresponding to current density β5 is greater than the number of display gray levels corresponding to current density β6, the number of display gray levels corresponding to current density β6 is greater than the number of display gray levels corresponding to current density β7, and the number of display gray levels corresponding to current density β7 is greater than the number of display gray levels corresponding to current density β8.

[0086] For example, in the 0-255 grayscale range, 0-30% of the display grayscale corresponds to β1, 30%-50% corresponds to β2, 50%-70% corresponds to β3, 70%-80% corresponds to β4, 80%-90% corresponds to β5, 90%-90% corresponds to β6, 95%-98% corresponds to β7, and 98%-100% corresponds to β8.

[0087] Step 30: Based on the brightness decay of the organic light-emitting diode at the beginning of the current time period and the target current density, obtain the brightness decay of the organic light-emitting diode during the current time period.

[0088] In some implementations, please refer to Figure 7 , Figure 7 This is a schematic diagram illustrating the specific process of step 30 in the brightness decay compensation method provided in the embodiments of this application. Figure 7 As shown, the steps for determining the brightness degradation of an organic light-emitting diode (OLED) within the current time period based on the brightness degradation at the beginning of the current time period and the target current density include the following specific procedures:

[0089] Step 301: Based on the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period and the target current density, obtain the equivalent decay time of the organic light-emitting diode in the current time period.

[0090] Step 302: Obtain the degree of brightness decay of the organic light-emitting diode in the current time period based on the equivalent decay time and the target current density.

[0091] in, Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 represents the target current density flowing through the organic light-emitting diode (OLED) during the current time period, f0 represents the degree of brightness decay of the OLED at the beginning of the current time period, and t0 represents the equivalent decay time of the OLED during the current time period.

[0092] in,

[0093]

[0094] Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 is the target current density flowing through the organic light-emitting diode in the current time period, t0 is the equivalent decay time of the organic light-emitting diode in the current time period, Δt is the duration of the current time period, and f1 is the degree of brightness decay of the organic light-emitting diode in the current time period.

[0095] Specifically, only one calculation of the brightness decay curve formula is needed for the organic light-emitting diode during each duration. Therefore, the hardware can be designed with only one set of calculation logic to perform brightness decay calculation of the organic light-emitting diode in a pipeline manner during each duration, thereby greatly reducing hardware consumption.

[0096] Step 40: Perform brightness compensation on the organic light-emitting diode (OLED) based on the degree of brightness decay of the OLED within the current time period.

[0097] In some implementations, please refer to Figure 8 , Figure 8 This is a schematic diagram illustrating the specific process of step 40 in the brightness decay compensation method provided in the embodiments of this application. Figure 8 As shown, the steps for compensating the brightness of an organic light-emitting diode (OLED) based on its brightness decay over the current time period include the following specific procedures:

[0098] Step 401: Obtain the input grayscale.

[0099] Step 402: Obtain the driving current value corresponding to the input gray level from the gray level-brightness mapping table.

[0100] Step 403: Obtain the actual drive current value based on the drive current value and the degree of brightness decay in the current time period.

[0101] Step 404: Obtain the display grayscale corresponding to the actual driving current value from the current-grayscale mapping table.

[0102] For details, please refer to Figure 9 , Figure 9 This is an illustrative description of step 40 in the brightness decay compensation method provided in the embodiments of this application. (In conjunction with...) Figure 8 , Figure 9 As shown, when performing brightness compensation, the input grayscale needs to be obtained by first obtaining the driving current value according to the grayscale-current mapping table, then the driving current value is divided by the brightness decay degree of the current time period to obtain the actual driving current value that needs to be raised, and finally the required display grayscale is obtained according to the current-grayscale mapping table to complete the compensation.

[0103] The brightness decay compensation method, brightness decay compensation device, and display device provided in this application embodiment obtain the brightness decay degree of the organic light-emitting diode at the beginning of the current time period; calculate the target current density flowing through the organic light-emitting diode during the current time period; obtain the brightness decay degree of the organic light-emitting diode during the current time period based on the brightness decay degree of the organic light-emitting diode at the beginning of the current time period and the target current density; and perform brightness compensation on the organic light-emitting diode according to the brightness decay degree of the organic light-emitting diode during the current time period, thereby enabling targeted compensation and improving the display uniformity of the display device.

[0104] In some implementations, please refer to Figure 10 , Figure 10This is another specific flowchart illustrating step 40 of the brightness decay compensation method provided in the embodiments of this application. For example... Figure 10 As shown, the steps for compensating the brightness of an organic light-emitting diode (OLED) based on its brightness decay over the current time period include the following specific procedures:

[0105] Step 401: Obtain the input grayscale.

[0106] Step 402: Obtain the driving current value corresponding to the input gray level from the gray level-brightness mapping table.

[0107] Step 403: Obtain the actual drive current value based on the drive current value and the degree of brightness decay in the current time period.

[0108] Step 404: Drive the corresponding LED according to the actual drive current value.

[0109] Please see Figure 11 , Figure 11 This is a schematic diagram of the brightness decay compensation device provided in an embodiment of this application. Figure 11 As shown, the brightness decay compensation device 50 provided in this application embodiment includes an acquisition module 501, a calculation module 502, a processing module 503, and a compensation module 504.

[0110] The acquisition module 501 is used to acquire the brightness decay rate of the organic light-emitting diode (OLED) at the start of the current time period. The calculation module 502 calculates the target current density flowing through the OLED during the current time period. The processing module 503 is used to obtain the brightness decay rate of the OLED during the current time period based on the brightness decay rate at the start of the current time period and the target current density. The compensation module 504 is used to perform brightness compensation on the OLED based on the brightness decay rate during the current time period.

[0111] In some implementations, the calculation module 502 is specifically used to perform the following steps: obtaining each current density flowing through the organic light-emitting diode and the duration corresponding to each current density within the current time period; and obtaining the target current density flowing through the organic light-emitting diode within the current time period based on each current density and each duration.

[0112] in,

[0113] Where βave is the target current density flowing through the organic light-emitting diode in the current time period, Δt is the duration of the current time period, and β i t represents a current density flowing through the organic light-emitting diode during the current time period.i The duration of a current density.

[0114] In some implementations, the processing module 503 is specifically used to perform the following steps: obtaining the equivalent decay time of the organic light-emitting diode in the current time period based on the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period and the target current density; and obtaining the degree of brightness decay of the organic light-emitting diode in the current time period based on the equivalent decay time and the target current density.

[0115] in, Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 represents the target current density flowing through the organic light-emitting diode (OLED) during the current time period, f0 represents the degree of brightness decay of the OLED at the beginning of the current time period, and t0 represents the equivalent decay time of the OLED during the current time period.

[0116] in,

[0117]

[0118] Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 is the target current density flowing through the organic light-emitting diode in the current time period, t0 is the equivalent decay time of the organic light-emitting diode in the current time period, Δt is the duration of the current time period, and f1 is the degree of brightness decay of the organic light-emitting diode in the current time period.

[0119] In some implementations, the compensation module 504 is specifically used to perform the following steps: obtaining the input grayscale; obtaining the driving current value corresponding to the input grayscale in the grayscale-current mapping table; obtaining the actual driving current value based on the driving current value and the brightness decay degree of the organic electroluminescent diode in the current time period; and obtaining the display grayscale corresponding to the actual driving current value in the current-grayscale mapping table.

[0120] The brightness decay compensation device 50 provided in this application acquires the brightness decay degree of the organic light-emitting diode at the beginning of the current time period through the acquisition module 501; the calculation module 502 calculates the target current density flowing through the organic light-emitting diode during the current time period; the processing module 503 obtains the brightness decay degree of the organic light-emitting diode during the current time period based on the brightness decay degree of the organic light-emitting diode at the beginning of the current time period and the target current density; and the compensation module 504 performs brightness compensation on the organic light-emitting diode according to the brightness decay degree of the organic light-emitting diode during the current time period, thereby enabling targeted compensation and improving the display uniformity of the brightness decay compensation device 50.

[0121] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A brightness decay compensation method, characterized in that, include: The brightness decay level of the organic light-emitting diode at the beginning of the current time period is obtained; wherein, the brightness decay level of the organic light-emitting diode at the beginning of the current time period is pre-stored in the display device and is automatically updated as the organic light-emitting diode is used. Calculate the target current density flowing through the organic light-emitting diode during the current time period; The brightness decay rate of the organic light-emitting diode (OLED) during the current time period is obtained based on the brightness decay rate at the start of the current time period and the target current density; wherein, the brightness decay curve calculation for the OLED only needs to be performed once for each duration; and Brightness compensation is performed on the organic electroluminescent diode based on the degree of brightness decay during the current time period; The step of compensating the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay during the current time period includes: Obtain the input grayscale; The driving current value corresponding to the input gray level is obtained from the gray level-current mapping table. The actual driving current value is obtained based on the driving current value and the degree of brightness decay of the organic electroluminescent diode during the current time period. Drive the corresponding LED according to the actual driving current value.

2. The brightness decay compensation method according to claim 1, characterized in that, The step of calculating the target current density flowing through the organic light-emitting diode during the current time period includes: Obtain each current density flowing through the organic light-emitting diode within the current time period and the duration corresponding to each current density; The target current density flowing through the organic light-emitting diode during the current time period is obtained based on each of the current densities and each of the durations.

3. The brightness decay compensation method according to claim 2, characterized in that, , where β ave β is the target current density flowing through the organic light-emitting diode during the current time period, Δt is the duration of the current time period, and β is the value of β. i t is a current density flowing through the organic light-emitting diode during the current time period. i The duration of a current density.

4. The brightness decay compensation method according to claim 2, characterized in that, The current density corresponds to at least one display grayscale level.

5. The brightness decay compensation method according to claim 4, characterized in that, The number of display gray levels corresponding to the current density gradually decreases from low gray level to high gray level.

6. The brightness decay compensation method according to claim 1, characterized in that, The step of obtaining the brightness decay degree of the organic light-emitting diode during the current time period based on the brightness decay degree of the organic light-emitting diode at the start time of the current time period and the target current density includes: The equivalent decay time of the organic electroluminescent diode in the current time period is obtained based on the degree of brightness decay of the organic electroluminescent diode at the start of the current time period and the target current density; The degree of brightness degradation of the organic light-emitting diode in the current time period is obtained based on the equivalent decay time and the target current density.

7. The brightness decay compensation method according to claim 6, characterized in that, Where τ is the decay time constant of the organic light-emitting diode, and β ave f0 is the target current density flowing through the organic light-emitting diode during the current time period, f0 is the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period, and t0 is the equivalent decay time of the organic light-emitting diode during the current time period.

8. The brightness decay compensation method according to claim 6, characterized in that, Where τ is the decay time constant of the organic light-emitting diode, and β ave t0 is the target current density flowing through the organic light-emitting diode during the current time period, t0 is the equivalent decay time of the organic light-emitting diode during the current time period, Δt is the duration of the current time period, and f1 is the degree of brightness decay of the organic light-emitting diode during the current time period.

9. A brightness decay compensation method, characterized in that, The brightness decay level of the organic light-emitting diode at the beginning of the current time period is obtained; wherein, the brightness decay level of the organic light-emitting diode at the beginning of the current time period is pre-stored in the display device and is automatically updated as the organic light-emitting diode is used. Calculate the target current density flowing through the organic light-emitting diode during the current time period; The brightness decay rate of the organic light-emitting diode (OLED) during the current time period is obtained based on the brightness decay rate at the start of the current time period and the target current density; wherein, the brightness decay curve calculation for the OLED only needs to be performed once for each duration; and Brightness compensation is performed on the organic electroluminescent diode based on the degree of brightness decay during the current time period; The step of compensating the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay during the current time period includes: Obtain the input grayscale; The driving current value corresponding to the input gray level is obtained from the gray level-current mapping table. The actual driving current value is obtained based on the driving current value and the degree of brightness decay of the organic electroluminescent diode during the current time period. The display grayscale corresponding to the actual driving current value is obtained from the current-grayscale mapping table.

10. A brightness decay compensation device, based on the brightness decay compensation method according to any one of claims 1 to 9, characterized in that, The device includes: The acquisition module is used to acquire the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period; The calculation module calculates the target current density flowing through the organic light-emitting diode during the current time period; The processing module is configured to obtain the degree of brightness decay of the organic light-emitting diode during the current time period based on the degree of brightness decay of the organic light-emitting diode at the beginning of the current time period and the target current density; A compensation module is provided to compensate the brightness of the organic light-emitting diode (OLED) based on the degree of brightness decay of the OLED during the current time period.

11. A display device, characterized in that, The device includes a display panel and a timing controller electrically connected to the display panel, the timing controller being used to perform the brightness decay compensation method as described in any one of claims 1 to 9.

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