Display panel aging brightness compensation method and device, electronic equipment and storage medium

Abstract

The invention discloses a display panel aging brightness compensation method and device, electronic equipment and a storage medium, and the method comprises the steps: controlling a brightness sensor in aging test equipment to collect the pixel brightness of a target pixel in a display panel when the aging duration reaches a target duration, judging whether to continue to carry out an aging test or not according to the pixel brightness and the target duration, and if yes, carrying out the aging test; if yes, the lightening voltage of the target pixel is determined, the compensation voltage is calculated according to the lightening voltage and the initial driving voltage and the initial driving current of the target pixel, the compensation voltage is adopted to carry out brightness compensation on the target pixel, so that the brightness of the target pixel is restored to the designed brightness, and the aging test continues to be carried out after the target duration is updated. According to the invention, the brightness of the target pixel does not need to be recovered to the designed brightness in a mode of manually collecting the pixel brightness and gradually applying the voltage, the time consumption of the aging test of the display panel is shortened, and the efficiency of the aging test of the display panel is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of display panel aging tests, and in particular, to a display panel aging brightness compensation method, device, electronic device, and storage medium. Background Art

[0002] During the production and manufacturing process of a display panel, in order to ensure the performance of the display panel, an aging test needs to be performed on the display panel.

[0003] Currently, during the display panel aging test, it is necessary to measure the brightness of pixels after different aging durations, and the performance of the display panel is measured by brightness. At the beginning of the test with different aging durations, the pixels need to be restored to the designed ideal brightness. For example, during the test process, after the display panel has aged for the first aging duration, the brightness of the pixels is measured, and then the display panel is turned off for cooling. Before the test of the second aging duration, the display panel is turned on, and the pixels of the display panel are restored to the ideal brightness. However, after the first aging duration, the aging process causes the transistors and light-emitting materials of the pixels to age. If the display panel is driven with the designed voltage, the brightness of the pixels is usually lower than the ideal brightness. Currently, mainly through testers gradually increasing the voltage of the pixels while measuring the brightness until the measured brightness reaches the ideal brightness.

[0004] The method for restoring the pixel brightness in the target display panel aging test requires manual measurement of the pixel brightness and manual gradual increase of the driving voltage to restore the pixel brightness. When the number of pixels (usually 120 pixels are selected for testing) is large, the entire aging test process takes a long time and has low efficiency. Summary of the Invention

[0005] The present invention provides a display panel aging brightness compensation method, device, electronic device, and storage medium to solve the problems that in the display panel aging test process, manual measurement of pixel brightness and gradual voltage increase to restore pixel brightness result in a long aging test process and low efficiency.

[0006] In a first aspect, the present invention provides a display panel aging brightness compensation method, including:

[0007] Recording the aging duration during the display panel aging test process;

[0008] When the aging duration reaches the target duration, controlling the brightness sensor in the aging test device to collect the pixel brightness of the target pixel in the display panel, and turning off the display panel;

[0009] Judging whether to continue the aging test according to the pixel brightness and the target duration;

[0010] If not, generating an aging test result;

[0011] If so, determine the lighting voltage of the target pixel, where the lighting voltage is the voltage for re-driving the target pixel to light up when it is determined to continue the aging test;

[0012] Calculate the compensation voltage according to the lighting voltage, the initial driving voltage of the target pixel, and the initial driving current;

[0013] Perform brightness compensation on the target pixel using the compensation voltage, update the target duration, and return to the step of recording the aging duration during the aging test of the display panel.

[0014] In a second aspect, the present invention provides a display panel aging brightness compensation device, including:

[0015] An aging duration recording module, configured to record the aging duration during the aging test of the display panel;

[0016] A brightness acquisition module, configured to control a brightness sensor in the aging test device to acquire the pixel brightness of the target pixel in the display panel and turn off the display panel when the aging duration reaches the target duration;

[0017] A judgment module, configured to judge whether to continue the aging test according to the pixel brightness and the target duration. If so, execute the lighting voltage determination module; if not, execute the test result generation module;

[0018] A test result generation module, configured to generate an aging test result;

[0019] A lighting voltage determination module, configured to determine the lighting voltage of the target pixel, where the lighting voltage is the voltage for re-driving the target pixel to light up when it is determined to continue the aging test;

[0020] A compensation voltage calculation module, configured to calculate the compensation voltage according to the lighting voltage, the initial driving voltage of the target pixel, and the initial driving current;

[0021] A compensation module, configured to perform brightness compensation on the target pixel using the compensation voltage, update the target duration, and return to the aging duration recording module.

[0022] In a third aspect, the present invention provides an electronic device, where the electronic device includes:

[0023] At least one processor; and

[0024] A memory communicatively connected to the at least one processor; wherein,

[0025] The memory stores a computer program executable by the at least one processor. When the computer program is executed by the at least one processor, the at least one processor is enabled to execute the display panel aging brightness compensation method described in the first aspect of the present invention.

[0026] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer instructions for causing a processor to implement the display panel aging brightness compensation method described in the first aspect of the present invention when executed.

[0027] In the embodiment of the present invention, when the aging duration of the display panel reaches the target duration, the pixel brightness of the target pixel is collected. When it is determined that the aging test needs to continue according to the pixel brightness and the target duration, the lighting voltage of the target pixel is first determined, and the compensation voltage is calculated based on the lighting voltage, the initial driving voltage, and the initial driving current of the target pixel. After the target pixel is compensated for brightness using the compensation voltage, the target duration for continuing the aging test is updated and the aging test is continued. It is possible to automatically collect the pixel brightness of the target pixel after the end of an aging test stage, calculate the compensation voltage for each target pixel in the next aging test stage, and compensate the brightness of the target pixel using the compensation voltage so that the brightness of the target pixel is restored to the designed brightness. There is no need to manually collect the pixel brightness and gradually apply voltages to restore the brightness of the target pixel to the designed brightness, shortening the time consumed by the display panel aging test and improving the efficiency of the display panel aging test.

[0028] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0030] Figure 1 is a flowchart of a display panel aging brightness compensation method provided in Embodiment I of the present invention;

[0031] Figure 2 is a flowchart of a display panel aging brightness compensation method provided in Embodiment II of the present invention;

[0032] Figure 3 is a schematic diagram when the aging test equipment conducts a test on the display panel;

[0033] Figure 4 It is a schematic diagram of the distribution of target pixel points in the display panel;

[0034] Figure 5 It is a schematic diagram of the pixel driving circuit;

[0035] Figure 6 It is a schematic diagram of the current-voltage curve before and after voltage compensation;

[0036] Figure 7 It is a schematic diagram of the structure of a display panel aging brightness compensation device provided in Embodiment III of the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of an electronic device provided in Embodiment IV of the present invention. Specific embodiments

[0038] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Embodiment I

[0040] Figure 1 It is a flowchart of a display panel aging brightness compensation method provided in Embodiment I of the present invention. This embodiment is applicable to the situation of performing brightness compensation on pixels during the display panel aging test so that the brightness of the pixels returns to the designed brightness after aging. This method can be executed by a display panel aging brightness compensation device, and the display panel aging brightness compensation device can be implemented in the form of hardware and / or software and can be configured in an aging test device, such as configured in an electronic device such as a computer or a control center of an aging test device. As Figure 1 shown, the display panel aging brightness compensation method includes:

[0041] S101. Record the aging duration during the display panel aging test.

[0042] The aging test can be an experiment in which the display panel is placed in an environment with preset temperature and humidity and the display panel is powered on to light up the display panel to test the performance of the display panel. Among them, the aging test can be divided into multiple stages according to the aging duration, and the aging duration can be the cumulative duration of multiple-stage aging tests. For example, the aging duration of the first stage is 336 hours, the aging duration of the second stage is 408 hours (including the aging duration of the first stage), the aging duration of the third stage is 480 hours (including the aging duration of the first and second stages), and the aging duration of the fourth stage is 552 hours (including the aging duration of the first, second, and third stages). Multiple stages can be set for different models of display panels or different aging environments.

[0043] At the start of each stage of the aging test, a timer can be started to record the cumulative aging duration of the display panel.

[0044] S102. When the aging duration reaches the target duration, control the brightness sensor in the aging test equipment to collect the pixel brightness of the target pixel in the display panel and turn off the display panel.

[0045] The target duration can be the duration of each aging stage. When the aging duration reaches the target duration, it is determined that a stage of the aging test ends, and the pixel brightness of the target pixel in the display panel can be collected through the brightness sensor in the aging test equipment.

[0046] Specifically, the display panel is composed of multiple pixels, and the target pixel can be a pixel whose brightness needs to be tested and is determined in advance. Exemplarily, the target pixel can be a preset number of pixels evenly distributed on the display panel. The distribution and number of target pixels can be determined according to the size and structure of the display panel. For example, a larger display panel can set more target pixels, and more target pixels can also be arranged at the edge of the display panel.

[0047] In addition, the aging test equipment can also include a manipulator for installing the brightness sensor. After setting the target pixels, a trajectory can be generated according to the distribution of the target pixels on the display panel, and the brightness sensor on the manipulator can be controlled to move along the trajectory to collect the brightness of each target pixel, and the display panel can be controlled to turn off for cooling after collecting the brightness of all target pixels.

[0048] S103. Determine whether to continue the aging test according to the pixel brightness and the target duration.

[0049] After the display panel is aged, under the influence of the aging environment (temperature, humidity), the driving circuit and light-emitting material of the pixels age. When the pixels are lit with the initial driving voltage designed, the brightness will decrease. A brightness decrease rate threshold can be set, and whether to conduct an aging test is determined based on the decrease rate threshold and the target duration. Exemplarily, it can be determined whether the brightness decrease rate of the target pixel is greater than the decrease rate threshold according to the pixel brightness, and whether it is the last stage of the aging test according to the target duration. If the brightness decrease rate of the target pixel is greater than the decrease rate threshold and the current stage is not the last stage, it is determined that there is no need to continue the aging test. Or if the current stage is the last stage, it is also determined that there is no need to continue the aging test, and S104 can be executed. If the brightness decrease rate of the target pixel is less than or equal to the decrease rate threshold and the current stage is not the last stage, it is determined that the aging test needs to be continued, and S105 can be executed.

[0050] S104. Generate the aging test result.

[0051] Specifically, the brightness decrease rate can be calculated based on the pixel brightness, and a test result including the brightness decrease rate, aging duration, and aging conditions (environment, temperature, etc.) can be generated. Exemplarily, if the brightness decrease rate is greater than the decrease rate threshold at a certain stage, a test result indicating non-compliance at a certain stage or aging duration can be generated.

[0052] S105. Determine the lighting voltage of the target pixel. The lighting voltage is the voltage when driving the target pixel to be lit.

[0053] In the driving circuit of the target pixel, after the transistor ages, the driving voltage increases. The lighting voltage when the transistor is driven to turn on and light the target pixel can be determined by the pressure test method. Exemplarily, a voltage can be applied to the target pixel with the initial driving voltage (the driving voltage designed for the transistor), and the voltage can be increased in a preset step. The voltage when the transistor is turned on and lit is the lighting voltage.

[0054] S106. Calculate the compensation voltage based on the lighting voltage, the initial driving voltage of the target pixel, and the initial driving current.

[0055] The compensation voltage in this embodiment includes a first compensation voltage required for the aging of transistors in the driving circuit of the target pixel and a second compensation voltage required for the aging of the light-emitting material. The first compensation voltage is the difference between the lighting voltage and the initial driving voltage. The second compensation voltage is related to the initial driving voltage, the initial driving current, and the lighting voltage. In one embodiment, the initial driving voltage, the initial driving current, and the lighting voltage can be substituted into a preset calculation formula to calculate the second compensation voltage. In another embodiment, a mapping relationship table between the second compensation voltage and the initial driving voltage, the initial driving current, and the lighting voltage can be pre-configured, and the second compensation voltage can be determined by looking up the mapping relationship table. Further, the sum value of the first compensation voltage and the second compensation voltage is calculated as the compensation voltage.

[0056] S107. Perform brightness compensation on the target pixel using the compensation voltage and update the target duration.

[0057] After determining the compensation voltage, when starting the next stage of the aging test, the brightness of the target pixel can be compensated using the compensation voltage. For example, the compensation voltage is applied to the compensation terminal in the driving circuit of the target pixel, so that the brightness of the target pixel is restored to the designed brightness after the end of the previous stage of the aging test, and the target duration of the next stage is used to replace the target duration, and then return to S101 to continue the aging test.

[0058] In the embodiment of the present invention, when the aging duration of the display panel reaches the target duration, the pixel brightness of the target pixel is collected. When it is determined that the aging test needs to be continued according to the pixel brightness and the target duration, first, the lighting voltage of the target pixel is determined, and the compensation voltage is calculated according to the lighting voltage, the initial driving voltage, and the initial driving current of the target pixel. After performing brightness compensation on the target pixel using the compensation voltage, the target duration for continuing the aging test is updated and the aging test is continued. It can automatically collect the pixel brightness of the target pixel after the end of one stage of the aging test, and calculate the compensation voltage of each target pixel in the next stage of the aging test. The brightness of the target pixel is compensated using this compensation voltage so that the brightness of the target pixel is restored to the designed brightness, without the need to manually collect the pixel brightness and gradually apply voltage to restore the brightness of the target pixel to the designed brightness, shortening the time-consuming of the display panel aging test and improving the efficiency of the display panel aging test.

[0059] Embodiment 2

[0060] Figure 2 As shown in the flowchart of a method for compensating the brightness of an aging display panel provided in Embodiment 2 of the present invention, the embodiment of the present invention is optimized on the basis of Embodiment 1 above, such as Figure 2 shown, the method for compensating the brightness of the aging display panel includes:

[0061] S201. Record the aging duration during the aging test of the display panel.

[0062] In this embodiment, the aging test can be divided into multiple stages according to the aging duration. For example, the aging duration of the first stage is 336 hours, the aging duration of the second stage is 408 hours, the aging duration of the third stage is 480 hours, and the aging duration of the fourth stage is 552 hours. The aging duration of each stage is the cumulative value, that is, the cumulative aging duration of the first n stages (except the first stage). Multiple stages can be set for display panels of different models or different aging environments. A timer can be started at the beginning of the aging test in each stage to record the aging duration of the display panel.

[0063] S202. When the aging duration reaches the target duration, control the manipulator to move along the preset trajectory, and multiple sampling points are set on the preset trajectory.

[0064] As Figure 3 shown in the schematic diagram of the aging test equipment, in Figure 3 the display panel 1 is fixed on the frame 2, and the manipulator 3 can perform three-dimensional movement along the track 4. A brightness sensor 5 is arranged on the manipulator 3 to collect the brightness of the target pixels in the display panel 1.

[0065] As Figure 4 shown in the schematic diagram of the distribution of the target pixel points on the display panel, in Figure 4 120 target pixels are set and marked with serial numbers. A trajectory can be generated according to the positions and the sequence of the serial numbers of the 120 target pixels in the display panel. The points on the trajectory facing the target pixels are the sampling points. When the aging duration reaches the target duration, it is determined that the aging test of a stage ends, and the manipulator can be controlled to move along the preset trajectory.

[0066] S203. When the manipulator moves to each sampling point, control the brightness sensor to collect the pixel brightness of the target pixels in the display panel at the sampling point.

[0067] During the movement of the manipulator along the trajectory, when it moves to each sampling point, control the brightness sensor at the end of the manipulator to collect the brightness at the sampling point, and obtain the pixel brightness of the target pixel facing the sampling point. Among them, the brightness sensor can be a spectrometer.

[0068] It should be noted that the target pixels can include R sub-pixels, G sub-pixels, B sub-pixels, and W pixels. Among them, the W pixel is composed of R sub-pixels, G sub-pixels, and B sub-pixels. A moving trajectory can be generated for each type of target pixel, that is, each trajectory is only used to collect the brightness of one type of target pixel, or a trajectory can be generated for all target pixels, that is, this trajectory is used to collect the brightness of multiple target pixels.

[0069] S204. After collecting the pixel brightness of all target pixels, control the display panel to turn off.

[0070] Specifically, after the manipulator finishes moving along the trajectory, when it is determined that the brightness sensor has collected the pixel brightness of all target pixels, the display panel can be controlled to turn off.

[0071] S205. Determine whether to continue the aging test according to the pixel brightness and the target duration.

[0072] In one embodiment, whether to continue the aging test is related to the pixel brightness and the current aging test stage. The brightness reduction rate can be calculated by using the pixel brightness and the preset brightness, and it is determined whether the brightness reduction rate is greater than the reduction rate threshold. If so, it is determined that there is no need to continue the aging test. If not, it is determined whether the target duration is the preset duration. When the target duration is the preset duration, it is determined that there is no need to continue the aging test. When the target duration is not the preset duration, it is determined that it is necessary to continue the aging test. Herein, the preset duration can be the maximum aging duration of the display panel and also the aging duration of the last aging stage.

[0073] Taking the example that the target pixels include multiple R sub-pixels, G sub-pixels, B sub-pixels, and W pixels (composed of R sub-pixels, G sub-pixels, and B sub-pixels), the average pixel brightness of multiple R sub-pixels, G sub-pixels, B sub-pixels, and W pixels can be calculated respectively to obtain the average R sub-pixel brightness, average G sub-pixel brightness, average B sub-pixel brightness, and average W pixel brightness. Calculate the deviation between the average R sub-pixel brightness and the preset brightness of the R sub-pixel to obtain the R sub-pixel brightness deviation value, calculate the deviation between the average G sub-pixel brightness and the preset brightness of the G sub-pixel to obtain the G sub-pixel brightness deviation value, calculate the deviation between the average B sub-pixel brightness and the preset brightness of the B sub-pixel to obtain the B sub-pixel brightness deviation value, calculate the deviation between the average W pixel brightness and the preset brightness of the W pixel to obtain the W pixel brightness deviation value, calculate the ratio of the R sub-pixel brightness deviation value to the preset brightness of the R sub-pixel to obtain the R sub-pixel brightness reduction rate, calculate the ratio of the G sub-pixel brightness deviation value to the preset brightness of the G sub-pixel to obtain the G sub-pixel brightness reduction rate, calculate the ratio of the B sub-pixel brightness deviation value to the preset brightness of the B sub-pixel to obtain the B sub-pixel brightness reduction rate, and calculate the ratio of the W pixel brightness deviation value to the preset brightness of the W pixel to obtain the W pixel brightness reduction rate.

[0074] Determine whether any one of the R sub-pixel brightness degradation rate, G sub-pixel brightness degradation rate, and B sub-pixel brightness degradation rate is greater than the first degradation rate threshold, and determine whether the W pixel brightness degradation rate is greater than the second degradation rate threshold. The first degradation rate threshold is greater than the second degradation rate threshold. If any one of the R sub-pixel brightness degradation rate, G sub-pixel brightness degradation rate, and B sub-pixel brightness degradation rate is greater than the first degradation rate threshold, or the W pixel brightness degradation rate is greater than the second degradation rate threshold, execute S206 to determine that the display panel is unqualified and determine that there is no need to continue the aging test.

[0075] If the R sub-pixel brightness degradation rate, G sub-pixel brightness degradation rate, and B sub-pixel brightness degradation rate are all less than or equal to the first degradation rate threshold, and the W pixel brightness degradation rate is less than or equal to the second degradation rate threshold, then determine whether the target duration is the preset duration. Among them, the preset duration can be the duration of the last aging stage. If so, determine that all aging stages of the display panel have been executed, the entire aging test is over, and S206 can be executed. If not, it means that there is a next aging stage for the display panel and the aging test needs to be continued, and S207 can be executed.

[0076] Taking the aging stages of the display panel including the first stage (336 hours), the second stage (408 hours), the third stage (480 hours), and the fourth stage (552 hours) as an example, if the aging duration reaches 336 hours, determine that the aging test of the first stage is over. If the R sub-pixel brightness degradation rate, G sub-pixel brightness degradation rate, and B sub-pixel brightness degradation rate are all less than 10%, and the W pixel brightness degradation rate is less than 5%, determine that the display panel is qualified after the aging test of the first stage. Since the aging duration of 336 hours is not the aging duration of 552 hours in the fourth stage, determine that the aging test needs to be continued. If the aging test of the first stage is over, if any one of the R sub-pixel brightness degradation rate, G sub-pixel brightness degradation rate, and B sub-pixel brightness degradation rate is greater than 10%, or the W pixel brightness degradation rate is greater than 5%, determine that the display panel is unqualified after the aging test of the first stage and there is no need to conduct the aging test of the next stage.

[0077] S206. Generate the aging test result.

[0078] Specifically, test results including the brightness degradation rate, aging duration, and aging conditions (environment, temperature, etc.) can be generated. Exemplarily, if the brightness degradation rate is greater than the degradation rate threshold in a certain stage, test results of being unqualified in a certain stage or aging duration can be generated. If the brightness degradation rate is qualified after all stages are over, test results of the qualified display panel can be generated.

[0079] S207. Starting from the initial driving voltage of the target pixel, apply a voltage to the target pixel with a preset step size.

[0080] As Figure 5 shown in the schematic diagram of the driving circuit of the target pixel, after the transistor D-TFT is driven by the voltage at the VDATA terminal to turn on and conduct, the current flows from the ELVDD terminal through the transistor D-TFT, the LED into the ground terminal, and the LED is lit. During the aging test of the display panel, both the transistor D-TFT and the LED are aged, and the driving voltage of the transistor D-TFT rises. Assume that before the aging test, the voltage at the VDATA terminal is the initial driving voltage V DATA , after the transistor D-TFT is aged, applying the initial driving voltage V DATA cannot drive the transistor D-TFT to conduct. The initial driving voltage V DATA can be applied to the VDATA terminal first, and then the voltage is increased at the VDATA terminal with a preset step size, so that the voltage at the VDATA terminal is increased. The preset step size can be determined according to the initial driving voltage V DATA , for example, it can be 1% or 5% of the initial driving voltage V DATA , and specifically can be determined according to the magnitude of the initial driving voltage V DATA and the anti-aging performance of the material of the transistor D-TFT. Exemplarily, assuming that the initial driving voltage of the transistor D-TFT is 5.0V, it can be determined that the preset step size can be 5.0×5% = 0.25V. When the second-stage aging test needs to be carried out after the first-stage aging test, first apply a voltage of 5.0V to the transistor D-TFT. If the transistor D-TFT does not conduct, increase it by 0.25V, that is, apply a voltage of 5.25V. If the transistor D-TFT still does not conduct, increase it by 0.25V again, that is, apply a voltage of 5.5V, and so on to increase the voltage with the preset step size until the transistor D-TFT conducts.

[0081] S208. When the target pixel is lit, determine the applied voltage as the lit voltage.

[0082] As Figure 5 shown, apply a voltage to the VDATA terminal. When the LED in the target pixel is lit, determine the voltage at the VDATA terminal as the lit voltage V GS , where, after aging, the lit voltage V GS is greater than the initial driving voltage V DATA .

[0083] S209. Calculate the difference between the lit voltage and the initial driving voltage to obtain the first compensation voltage.

[0084] Specifically, the first compensation voltage Φ = V GS −V DATA .

[0085] S210. Calculate the second compensation voltage using the first compensation voltage, the initial driving voltage, the initial driving current, and the lighting voltage.

[0086] In one embodiment, the compensation factor α can be calculated first through the following formula REF：

[0087]

[0088] I DS is the initial driving current, and V DATA is the initial driving voltage;

[0089] Calculate the second compensation voltage V through the following formula α :

[0090]

[0091] V GS is the lighting voltage, and Φ is the first compensation voltage.

[0092] S211. Calculate the sum of the first compensation voltage and the second compensation voltage as the compensation voltage.

[0093] As Figure 6 shown is the simulation schematic diagram of voltage compensation. The red curve is the voltage-current curve of the target pixel before the aging test, and the blue curve is the voltage-current curve of the compensation after aging. As can be seen from Figure 6 it, before compensating with the first compensation voltage Φ, when the current I flowing through the LED is not 0, that is, when the transistor D-TFT in Figure 5 is turned on and makes the current I not 0, compared with before aging, the first compensation voltage Φ needs to be added to V. After compensating the first compensation voltage Φ, to reach the designed brightness, the current I flowing through the LED DS , there is still a difference of the second compensation voltage V in voltage α . After performing Φ + V α compensation, the blue curve coincides completely with the red curve, indicating that after compensating the target pixel with the compensation voltage calculated in this embodiment, the brightness of the target pixel can be restored to the designed brightness.

[0094] S212. Perform brightness compensation on the target pixel using the compensation voltage and update the target duration.

[0095] Exemplarily, as Figure 5 shown, the compensation voltage can be applied at the compensation terminal to make the current flowing through the LED reach the initial driving current I DS, that is, the brightness of the LED reaches the designed brightness so as to continue the aging test, and the duration of the next aging stage is used to replace the target duration. Exemplarily, the current aging stage is the first stage of 336 hours, and the next aging stage is the second stage of 408 hours. The target duration in the timer can be updated to 408 hours. After returning to S201, the timer starts cumulative timing, that is, starts timing from 336 hours, and continues the aging test.

[0096] In this embodiment, when the aging duration reaches the target duration, when controlling the manipulator to move to the sampling point according to the preset trajectory, the brightness sensor is controlled to collect the pixel brightness of the target pixel in the display panel. After collecting the pixel brightness of all target pixels, it is judged whether to continue the aging test according to the pixel brightness and the target duration. If so, starting from the initial driving voltage of the target pixel, a voltage is applied to the target pixel with a preset step size. When the target pixel is lit, the applied voltage is determined as the lighting voltage. The difference between the lighting voltage and the initial driving voltage is calculated to obtain the first compensation voltage. The second compensation voltage is calculated by using the first compensation voltage, the initial driving voltage, the initial driving current and the lighting voltage. The sum value of the first compensation voltage and the second compensation voltage is calculated to obtain the compensation voltage. The compensation voltage is used to perform brightness compensation on the target pixel so that the brightness of the target pixel is restored to the designed brightness, and the target duration is updated to continue the aging test. There is no need to manually collect the pixel brightness and gradually apply the voltage to restore the brightness of the target pixel to the designed brightness, which shortens the time-consuming of the aging test of the display panel and improves the efficiency of the aging test of the display panel and the automation degree of the aging test.

[0097] Embodiment III

[0098] Figure 7 It is a schematic structural diagram of a display panel aging brightness compensation device provided by Embodiment III of the present invention. As Figure 7 shown, the display panel aging brightness compensation device includes:

[0099] An aging duration recording module 701, configured to record the aging duration during the aging test of the display panel;

[0100] A brightness acquisition module 702, configured to control a brightness sensor in the aging test device to collect the pixel brightness of the target pixel in the display panel when the aging duration reaches the target duration, and turn off the display panel;

[0101] A judgment module 703, configured to judge whether to continue the aging test according to the pixel brightness and the target duration. If so, execute the lighting voltage determination module 705. If not, execute the test result generation module 704;

[0102] A test result generation module 704, configured to generate an aging test result;

[0103] The lighting voltage determination module 705 is configured to determine the lighting voltage of the target pixel, where the lighting voltage is the voltage for re-driving the target pixel to light up when determining to continue the aging test;

[0104] The compensation voltage calculation module 706 is configured to calculate a compensation voltage according to the lighting voltage, the initial driving voltage, and the initial driving current of the target pixel;

[0105] The compensation module 707 is configured to perform brightness compensation on the target pixel by using the compensation voltage, update the target duration, and return to the aging duration recording module.

[0106] Optionally, the aging test device is provided with a manipulator for installing the brightness sensor, and the brightness acquisition module 702 includes:

[0107] The manipulator control unit is configured to control the manipulator to move along a preset trajectory, and a plurality of sampling points are set on the preset trajectory;

[0108] The brightness acquisition unit is configured to control the brightness sensor to acquire the pixel brightness of the target pixel in the display panel at each sampling point when the manipulator moves to each sampling point;

[0109] The display screen control unit is configured to control the display panel to turn off after acquiring the pixel brightness of all target pixels.

[0110] Optionally, the determination module 703 includes:

[0111] The decline rate calculation unit is configured to calculate a brightness decline rate by using the pixel brightness and a preset brightness;

[0112] The decline rate determination unit is configured to determine whether the brightness decline rate is greater than a preset decline rate threshold. If so, execute the first determination unit; if not, execute the duration determination unit;

[0113] The first determination unit is configured to determine that it is not necessary to continue the aging test;

[0114] The duration determination unit is configured to determine whether the target duration is a preset duration. If so, execute the first determination unit; if not, execute the second determination unit;

[0115] The second determination unit is configured to determine that it is necessary to continue the aging test.

[0116] Optionally, the target pixel includes a plurality of R sub-pixels, G sub-pixels, B sub-pixels, and W pixels, and the decline rate calculation unit includes:

[0117] A brightness average calculation sub-unit, configured to calculate the pixel brightness averages of a plurality of R sub-pixels, G sub-pixels, B sub-pixels, and W pixels respectively, to obtain an R sub-pixel brightness average, a G sub-pixel brightness average, a B sub-pixel brightness average, and a W pixel brightness average;

[0118] A brightness deviation value calculation sub-unit, configured to calculate the deviation between the R sub-pixel brightness average and the preset brightness of the R sub-pixel to obtain an R sub-pixel brightness deviation value, calculate the deviation between the G sub-pixel brightness average and the preset brightness of the G sub-pixel to obtain a G sub-pixel brightness deviation value, calculate the deviation between the B sub-pixel brightness average and the preset brightness of the B sub-pixel to obtain a B sub-pixel brightness deviation value, and calculate the deviation between the W pixel brightness average and the preset brightness of the W pixel to obtain a W pixel brightness deviation value;

[0119] A brightness decrease rate calculation sub-unit, configured to calculate the ratio of the R sub-pixel brightness deviation value to the preset brightness of the R sub-pixel to obtain an R sub-pixel brightness decrease rate, calculate the ratio of the G sub-pixel brightness deviation value to the preset brightness of the G sub-pixel to obtain a G sub-pixel brightness decrease rate, calculate the ratio of the B sub-pixel brightness deviation value to the preset brightness of the B sub-pixel to obtain a B sub-pixel brightness decrease rate, and calculate the ratio of the W pixel brightness deviation value to the preset brightness of the W pixel to obtain a W pixel brightness decrease rate;

[0120] The decrease rate determination unit includes:

[0121] A first determination sub-unit, configured to determine whether any one of the R sub-pixel brightness decrease rate, the G sub-pixel brightness decrease rate, and the B sub-pixel brightness decrease rate is greater than a first decrease rate threshold, and determine whether the W pixel brightness decrease rate is greater than a second decrease rate threshold, where the first decrease rate threshold is greater than the second decrease rate threshold;

[0122] A first determination unit, configured to, if any one of the R sub-pixel brightness decrease rate, the G sub-pixel brightness decrease rate, and the B sub-pixel brightness decrease rate is greater than the first decrease rate threshold, or the W pixel brightness decrease rate is greater than the second decrease rate threshold, determine to execute the first determination unit;

[0123] A second determination unit, configured to, if the R sub-pixel brightness decrease rate, the G sub-pixel brightness decrease rate, and the B sub-pixel brightness decrease rate are all less than or equal to the first decrease rate threshold, and the W pixel brightness decrease rate is less than or equal to the second decrease rate threshold, determine to execute the duration determination unit.

[0124] Optionally, the lighting voltage determination module 705 includes:

[0125] A voltage application unit, configured to start from the initial driving voltage of the target pixel and apply a voltage to the target pixel with a preset step size;

[0126] A voltage determination unit, configured to determine the applied voltage as the lighting voltage when the target pixel is lit.

[0127] Optionally, the compensation voltage calculation module 706 includes:

[0128] A first compensation voltage calculation unit for calculating the difference between the lighting voltage and the initial driving voltage to obtain a first compensation voltage;

[0129] A second compensation voltage calculation unit for calculating a second compensation voltage by using the first compensation voltage, the initial driving voltage, the initial driving current, and the lighting voltage;

[0130] A compensation voltage calculation unit for calculating the sum of the first compensation voltage and the second compensation voltage as the compensation voltage.

[0131] Optionally, the second compensation voltage calculation unit includes:

[0132] A compensation factor calculation subunit for calculating a compensation factor α through the following formula REF :

[0133]

[0134] I DS is the initial driving current, V DATA is the initial driving voltage;

[0135] A second compensation voltage calculation subunit for calculating a second compensation voltage V α :

[0136]

[0137] V GS is the lighting voltage, and Φ is the first compensation voltage.

[0138] The display panel aging brightness compensation device provided by the embodiments of the present invention can execute the display panel aging brightness compensation method provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

[0139] Embodiment 4

[0140] Figure 8FIG. 0 shows a schematic structural diagram of an aging test device 80 that can be used to implement an embodiment of the present invention. The aging test device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processors, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0141] As Figure 8 shown, the electronic device 80 includes at least one processor 81, and a memory communicatively connected to the at least one processor 81, such as a read-only memory (ROM) 82, a random access memory (RAM) 83, etc. The memory stores a computer program executable by the at least one processor. The processor 81 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 82 or the computer program loaded from the storage unit 88 into the random access memory (RAM) 83. In the RAM 83, various programs and data required for the operation of the electronic device 80 can also be stored. The processor 81, the ROM 82, and the RAM 83 are connected to each other through a bus 84. An input / output (I / O) interface 85 is also connected to the bus 84.

[0142] A plurality of components in the electronic device 80 are connected to the I / O interface 85, including: an input unit 86, such as a keyboard, a mouse, etc.; an output unit 87, such as various types of displays, speakers, etc.; a storage unit 88, such as a magnetic disk, an optical disk, etc.; and a communication unit 89, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 89 allows the electronic device 80 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0143] The processor 81 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 81 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The processor 81 executes the various methods and processes described above, such as the display panel aging brightness compensation method.

[0144] In some embodiments, the display panel aging brightness compensation method may be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 88. In some embodiments, part or all of the computer program may be loaded and / or installed onto the electronic device 80 via the ROM 82 and / or the communication unit 89. When the computer program is loaded into the RAM 83 and executed by the processor 81, one or more steps of the display panel aging brightness compensation method described above may be executed. Alternatively, in other embodiments, the processor 81 may be configured to execute the display panel aging brightness compensation method by any other suitable means (e.g., by means of firmware).

[0145] The various embodiments of the systems and techniques described above in this document may be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGA), application specific integrated circuits (ASIC), application specific standard products (ASSP), systems on a chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: implemented in one or more computer programs that may be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a special-purpose or general-purpose programmable processor that receives data and instructions from a storage system, at least one input device, and at least one output device, and transmits the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0146] The computer program for implementing the method of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowchart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0147] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0148] In order to provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, speech input, or tactile input).

[0149] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0150] A computing system may include a client and a server. The client and the server are generally far from each other and usually interact via a communication network. The client-server relationship is created by computer programs running on respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system, solving the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0151] It should be understood that various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0152] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for compensating the aging brightness of a display panel, characterized in that, Including: Recording the aging duration during the aging test of the display panel; When the aging duration reaches the target duration, controlling the brightness sensor in the aging test equipment to collect the pixel brightness of the target pixel in the display panel, and turning off the display panel; Judging whether to continue the aging test according to the pixel brightness and the target duration; If not, generating the aging test result; If so, determining the lighting voltage of the target pixel, where the lighting voltage is the voltage when the target pixel is redriven to light up when it is determined to continue the aging test; Calculating the compensation voltage according to the lighting voltage, the initial driving voltage and the initial driving current of the target pixel; Performing brightness compensation on the target pixel by using the compensation voltage, updating the target duration, and returning to the step of recording the aging duration during the aging test of the display panel.

2. The display panel aging brightness compensation method according to claim 1, wherein The aging test equipment is provided with a manipulator for installing the brightness sensor. When the aging duration reaches the target duration, controlling the brightness sensor in the aging test equipment to collect the pixel brightness of the target pixel in the display panel, and turning off the display panel includes: Controlling the manipulator to move along a preset trajectory, and a plurality of sampling points are set on the preset trajectory; When the manipulator moves to each sampling point, controlling the brightness sensor to collect the pixel brightness of the target pixel in the display panel at the sampling point; After collecting the pixel brightness of all target pixels, controlling the display panel to turn off.

3. The display panel aging brightness compensation method according to claim 1, wherein, Judging whether to continue the aging test according to the pixel brightness and the target duration includes: Calculating the brightness reduction rate by using the pixel brightness and a preset brightness; Judging whether the brightness reduction rate is greater than a preset reduction rate threshold; If so, determining that there is no need to continue the aging test; If not, judging whether the target duration is a preset duration; When the target duration is the preset duration, determining that there is no need to continue the aging test; When the target duration is not the preset duration, determining that it is necessary to continue the aging test.

4. The display panel aging brightness compensation method according to claim 3, wherein The target pixel includes a plurality of R sub-pixels, G sub-pixels, B sub-pixels, and W pixels. Calculating the brightness reduction rate by using the pixel brightness and a preset brightness includes: Respectively calculating the pixel brightness means of a plurality of R sub-pixels, G sub-pixels, B sub-pixels, and W pixels to obtain the R sub-pixel brightness mean, the G sub-pixel brightness mean, the B sub-pixel brightness mean, and the W pixel brightness mean; Calculating the deviation between the R sub-pixel brightness mean and the preset brightness of the R sub-pixel to obtain the R sub-pixel brightness deviation value, calculating the deviation between the G sub-pixel brightness mean and the preset brightness of the G sub-pixel to obtain the G sub-pixel brightness deviation value, calculating the deviation between the B sub-pixel brightness mean and the preset brightness of the B sub-pixel to obtain the B sub-pixel brightness deviation value, and calculating the deviation between the W pixel brightness mean and the preset brightness of the W pixel to obtain the W pixel brightness deviation value; Calculate the ratio of the R sub-pixel brightness deviation value to the preset brightness of the R sub-pixel to obtain the R sub-pixel brightness reduction rate, calculate the ratio of the G sub-pixel brightness deviation value to the preset brightness of the G sub-pixel to obtain the G sub-pixel brightness reduction rate, calculate the ratio of the B sub-pixel brightness deviation value to the preset brightness of the B sub-pixel to obtain the B sub-pixel brightness reduction rate, and calculate the ratio of the W pixel brightness deviation value to the preset brightness of the W pixel to obtain the W pixel brightness reduction rate; Determine whether the brightness reduction rate is greater than a preset reduction rate threshold, including: Determine whether any one of the R sub-pixel brightness reduction rate, G sub-pixel brightness reduction rate, and B sub-pixel brightness reduction rate is greater than the first reduction rate threshold, and determine whether the W pixel brightness reduction rate is greater than the second reduction rate threshold, where the first reduction rate threshold is greater than the second reduction rate threshold; If any one of the R sub-pixel brightness reduction rate, G sub-pixel brightness reduction rate, and B sub-pixel brightness reduction rate is greater than the first reduction rate threshold, or the W pixel brightness reduction rate is greater than the second reduction rate threshold, perform the step of determining that there is no need to continue the aging test; If the R sub-pixel brightness reduction rate, G sub-pixel brightness reduction rate, and B sub-pixel brightness reduction rate are all less than or equal to the first reduction rate threshold, and the W pixel brightness reduction rate is less than or equal to the second reduction rate threshold, perform the step of determining whether the target duration is a preset duration.

5. The display panel aging brightness compensation method according to claim 1, wherein Determine the lighting voltage of the target pixel, including: Starting from the initial driving voltage of the target pixel, apply a voltage to the target pixel with a preset step size; When the target pixel is lit, determine the applied voltage as the lighting voltage.

6. The aging brightness compensation method for a display panel according to any one of claims 1-5, characterized in that, Calculate the compensation voltage according to the lighting voltage, the initial driving voltage of the target pixel, and the initial driving current, including: Calculate the difference between the lighting voltage and the initial driving voltage to obtain the first compensation voltage; Calculate the second compensation voltage using the first compensation voltage, the initial driving voltage, the initial driving current, and the lighting voltage; Calculate the sum value of the first compensation voltage and the second compensation voltage to obtain the total compensation voltage.

7. The display panel aging brightness compensation method according to claim 6, wherein, Calculate the second compensation voltage using the first compensation voltage, the initial driving voltage, the initial driving current, and the lighting voltage, including: Calculate the compensation factor α using the following formula REF： I DS is the initial drive current, V DATA is the initial drive voltage; The second compensation voltage V is calculated by the following formula α : V GS is the lighting voltage, and Φ is the first compensation voltage.

8. An aging brightness compensation device for a display panel, characterized in that, Include: An aging duration recording module for recording the aging duration during the aging test of the display panel; A brightness acquisition module for controlling the brightness sensor in the aging test equipment to acquire the pixel brightness of the target pixel in the display panel when the aging duration reaches the target duration, and turning off the display panel; A judgment module for judging whether to continue the aging test according to the pixel brightness and the target duration. If so, execute the lighting voltage determination module. If not, execute the test result generation module; A test result generation module for generating an aging test result; A lighting voltage determination module for determining the lighting voltage of the target pixel, where the lighting voltage is the voltage when the target pixel is re-driven to be lit when it is determined to continue the aging test; A compensation voltage calculation module for calculating the compensation voltage according to the lighting voltage, the initial driving voltage of the target pixel, and the initial driving current; A compensation module, configured to perform brightness compensation on the target pixel using the compensation voltage, update the target duration, and return to the aging duration recording module.

9. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the display panel aging brightness compensation method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a processor to implement the display panel aging brightness compensation method according to any one of claims 1-7 when executed.

Images