Display panel compensation method, device and display device

Abstract

The present invention discloses a compensation method, device and display device for a display panel. The compensation method for the display panel includes: obtaining the first time when the initialization module initializes the light-emitting unit to a preset voltage after the light-emitting unit attenuates; adjusting the data voltage according to the first time and the preset time; wherein the preset time is the time when the initialization module initializes the light-emitting unit to the preset voltage before the light-emitting unit attenuates; and providing the adjusted data voltage to the driving module. By obtaining the first time when the initialization module initializes the light-emitting unit to the preset voltage after the light-emitting unit attenuates, and then adjusting the data voltage according to the first time and the preset time, the driving current formed by the driving module according to the adjusted data voltage is increased, thereby increasing the luminous brightness of the light-emitting unit after attenuation, at least partially offsetting the brightness difference caused by the attenuation of the light-emitting unit, slowing down the brightness attenuation of the light-emitting unit, and improving the display effect and life of the display panel.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of display, and in particular to a compensation method and device for a display panel, and a display device. Background Art

[0002] With the development of display technology, active-matrix organic light-emitting diodes (AMOLED) have been increasingly used in the field of display technology due to their characteristics of high contrast, wide color gamut and low latency.

[0003] AMOLED display panels include pixel driver circuits and light-emitting devices. The pixel driver circuit is used to drive the light-emitting devices to emit light. In the prior art, as the light-emitting devices' emission time increases, their luminous efficiency decreases, resulting in a decrease in their brightness and poor display quality. Summary of the Invention

[0004] The present invention provides a compensation method and device for a display panel and a display device, so as to improve the display effect of the display panel.

[0005] In a first aspect, an embodiment of the present invention provides a compensation method for a display panel, wherein the display panel includes a light-emitting unit and a pixel circuit for driving the light-emitting unit to emit light, the pixel circuit including a driving module and an initialization module, both of which are connected to the light-emitting unit, the initialization module being configured to initialize the light-emitting unit, and the driving module being configured to generate a driving current according to a data voltage to drive the light-emitting unit to emit light; the compensation method includes:

[0006] Acquire a first time for the initialization module to initialize the light emitting unit to a preset voltage after the light emitting unit attenuates;

[0007] The data voltage is adjusted according to the first time and a preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit decays;

[0008] Providing the adjusted data voltage to the driving module.

[0009] Optionally, obtaining a first time for the initialization module to initialize the light emitting unit to a preset voltage after the light emitting unit attenuates includes:

[0010] When the initialization module starts to initialize the first electrode of the light-emitting unit after the light-emitting unit decays, timing is started, and the voltage of the first electrode of the light-emitting unit is obtained during the timing process;

[0011] The first electrode voltage of the light-emitting unit is compared with the preset voltage, and timing is continued when the first electrode voltage of the light-emitting unit is greater than the preset voltage, and timing is ended until the first electrode voltage of the light-emitting unit is no greater than the preset voltage to determine the first time.

[0012] Optionally, comparing the first electrode voltage of the light-emitting unit with the preset voltage, continuing timing when the first electrode voltage of the light-emitting unit is greater than the preset voltage, and ending timing when the first electrode voltage of the light-emitting unit is no greater than the preset voltage, and determining the first time includes:

[0013] Comparing the first electrode voltage of the light emitting unit with the preset voltage by a comparator, and outputting the comparison result to a counter;

[0014] receiving the comparison result through the counter, and continuing pulse counting when the comparison result shows that the voltage at the first pole of the light-emitting unit is greater than the preset voltage, and ending pulse counting when the comparison result shows that the voltage at the first pole of the light-emitting unit is not greater than the preset voltage;

[0015] The first time is determined according to the number of pulses and the pulse period counted by the counter.

[0016] Optionally, adjusting the data voltage according to the first time and the preset time includes:

[0017] determining a time difference between the first time and the preset time;

[0018] determining a compensation voltage according to the time difference; wherein the time difference is positively correlated with the compensation voltage;

[0019] The data voltage is adjusted according to the compensation voltage.

[0020] Optionally, determining a compensation voltage according to the time difference includes:

[0021] According to the correspondence between the preset time difference and the compensation voltage, the compensation voltage corresponding to the time difference between the first time and the preset time is determined.

[0022] Optionally, before the first time for the initialization module to initialize the light emitting unit to a preset voltage after obtaining the attenuation of the light emitting unit, the method further includes:

[0023] The preset time for the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit attenuates is obtained and stored.

[0024] In a second aspect, an embodiment of the present invention further provides a compensation device for a display panel, wherein the display panel includes a light-emitting unit and a pixel circuit for driving the light-emitting unit to emit light, the pixel circuit including a driving module and an initialization module, both of which are connected to the light-emitting unit, the initialization module being configured to initialize the light-emitting unit, and the driving module being configured to generate a driving current according to a data voltage to drive the light-emitting unit to emit light; the compensation device includes:

[0025] An acquisition module, configured to acquire a first time when the initialization module initializes the light emitting unit to a preset voltage after the light emitting unit attenuates;

[0026] an adjusting module, configured to adjust the data voltage according to the first time and a preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit attenuates;

[0027] A module is provided for providing an adjusted data voltage to the driving module.

[0028] Optionally, the acquisition module includes an acquisition unit and a determination unit;

[0029] The acquisition unit is configured to acquire the voltage of the first electrode of the light emitting unit when the initialization module starts to initialize the first electrode of the light emitting unit after the light emitting unit decays;

[0030] The determination unit is used to compare the first pole voltage of the light-emitting unit with the preset voltage, start timing when the first pole voltage of the light-emitting unit is greater than the preset voltage, and end timing when the first pole voltage of the light-emitting unit is no greater than the preset voltage to determine the first time.

[0031] Optionally, the determining unit includes a comparator, a counter and a determining subunit;

[0032] The positive input terminal of the comparator is connected to the acquisition unit, and the negative input terminal of the comparator is connected to the preset voltage input terminal. The comparator is used to compare the first electrode voltage of the light-emitting unit with the preset voltage and output the comparison result through the output terminal of the comparator; the output terminal of the comparator is connected to the enable input terminal of the counter; the counter is used to receive the comparison result and continue to count pulses when the comparison result shows that the first electrode voltage of the light-emitting unit is greater than the preset voltage, and end the pulse counting when the comparison result shows that the first electrode voltage of the light-emitting unit is not greater than the preset voltage;

[0033] The determining subunit is connected to the counter, and is configured to determine the first time according to the number of pulses and the pulse period counted by the counter.

[0034] In a third aspect, an embodiment of the present invention further provides a display device comprising a display panel and the compensation device for the display panel according to the second aspect.

[0035] The technical solution of the embodiment of the present invention obtains the first time for the initialization module to initialize the light-emitting unit to a preset voltage after the light-emitting unit attenuates, and then adjusts the data voltage according to the first time and the preset time, so that the driving current formed by the driving module according to the adjusted data voltage increases, thereby increasing the luminous brightness of the light-emitting unit after the luminous efficiency attenuates, at least partially offsetting the luminous brightness difference caused by the luminous efficiency attenuation of the light-emitting unit, thereby slowing down the brightness attenuation of the light-emitting unit and improving the display effect and life of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flow chart of a compensation method for a display panel provided by an embodiment of the present invention;

[0037] Figure 2 A schematic structural diagram of a pixel circuit provided by an embodiment of the present invention;

[0038] Figure 3 An equivalent circuit diagram of a light-emitting unit in the initialization stage provided by an embodiment of the present invention;

[0039] Figure 4 A discharge curve diagram of a different residual voltage discharged to a preset voltage provided by an embodiment of the present invention;

[0040] Figure 5 A flowchart of another display panel compensation method provided by an embodiment of the present invention;

[0041] Figure 6 A flowchart of another display panel compensation method provided by an embodiment of the present invention;

[0042] Figure 7 A schematic structural diagram of a compensation device for a display panel provided by an embodiment of the present invention;

[0043] Figure 8 A schematic structural diagram of another compensation device for a display panel provided by an embodiment of the present invention;

[0044] Figure 9 A schematic structural diagram of a display device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0046] Figure 1 A flowchart of a compensation method for a display panel provided in an embodiment of the present invention, this embodiment is applicable to the case where the luminous brightness of the light-emitting unit on the display panel decays as the light-emitting time increases. Specifically, the display panel includes a light-emitting unit and a pixel circuit that drives the light-emitting unit to emit light, and the pixel circuit includes a driving module and an initialization module. Both the driving module and the initialization module are connected to the light-emitting unit. The initialization module is used to initialize the light-emitting unit, and the driving module is used to form a driving current according to the data voltage to drive the light-emitting unit to emit light. This method can be executed by a compensation device of the display panel, and the compensation device of the display panel can be integrated into a driver chip of the display panel. Figure 1 As shown, the compensation method of the display panel specifically includes the following steps:

[0047] S110, obtaining a first time for the initialization module to initialize the light-emitting unit to a preset voltage after the light-emitting unit attenuates;

[0048] in, Figure 2 Schematic diagram of a pixel circuit provided by an embodiment of the present invention. Figure 2 As shown, the pixel circuit includes a driving module 10, a data writing module 20, a threshold compensation module 30, a storage module 40, a reset module 50, a light emitting control module 60 and an initialization module 70, and Figure 2The figure exemplarily shows that the driving module 10 includes a driving transistor Tdr, the data writing module 20 includes a data writing transistor T1, the threshold compensation module 30 includes a threshold compensation transistor T2, the storage module 40 includes a storage capacitor Cst, the reset module 50 includes a reset transistor T3, the light control module 60 includes a first light control transistor T4 and a second light control transistor T5, and the initialization module 70 includes an initialization transistor T6. The first electrode of the data writing transistor T1 is connected to the data voltage Vdata, the second electrode of the data writing transistor T1 is connected to the first electrode of the driving transistor Tdr and the second electrode of the first light control transistor T4, and the gate of the data writing transistor T1 is connected to the second scanning signal S2; the second electrode of the driving transistor Tdr is connected to the first electrode of the threshold compensation transistor T2 and the first electrode of the second light control transistor T5, the gate of the driving transistor Tdr is connected to the second electrode of the threshold compensation transistor T2 and the second electrode of the reset transistor T3, and the gate of the threshold compensation transistor T2 is connected to the second scanning signal S2; the first electrode of the reset transistor T3 is connected to the first electrode of the first light control transistor T4. An initialization signal VREF1 is provided, and the gate of the reset transistor T3 is connected to the first scanning signal S1; the first electrode of the first light-emitting control transistor T4 is connected to the first power signal VDD, the second electrode of the second light-emitting control transistor T5 is connected to the second electrode of the initialization transistor T6 and the first electrode N1 of the light-emitting unit 80, and the gates of the first light-emitting control transistor T4 and the second light-emitting control transistor T5 are connected to the light-emitting control signal EM; the first electrode of the initialization transistor T6 is connected to the second initialization signal VREF2, the gate of the initialization transistor T6 is connected to the third scanning signal S3, and the second electrode of the light-emitting unit 80 is connected to the first power signal VSS. Figure 2 exemplarily shows that the light emitting unit 80 includes a light emitting device D1, Figure 2 The capacitor Cs included in the light emitting unit 80 can be understood as a parasitic capacitor.

[0049] When the pixel circuit drives the light-emitting unit 80 to work, the pixel circuit includes a gate initialization stage, a data writing stage, a light-emitting unit initialization stage and a light-emitting stage. In the gate initialization stage, the first scan signal controls the reset transistor T3 to turn on, and the first initialization signal is transmitted to the gate of the driving transistor Tdr through the reset transistor T3 to reset the gate of the driving transistor Tdr. At the end of the gate initialization stage, the driving transistor Tdr is in the on state. In the data writing stage, the second scan signal controls the data writing transistor T1 and the threshold compensation transistor T2 to turn on, and the data voltage is written to the gate of the driving transistor Tdr through the data writing transistor T1, the driving transistor Tdr and the threshold compensation transistor T2 to achieve the writing of the data voltage and the threshold compensation of the driving transistor Tdr. In the light-emitting unit initialization stage, the third scan signal controls the initialization transistor T6 to turn on, and the second initialization signal is transmitted to the N1 node of the light-emitting unit 80 through the initialization transistor T6. Figure 2 Node N1 is exemplarily shown as the anode of light-emitting device D1. When initializing the anode of light-emitting device D1, the potential of node N1 of light-emitting unit 80 is discharged from the residual voltage of the previous frame to the second initialization voltage VREF2, thereby initializing light-emitting unit 80, that is, initializing the first electrode of light-emitting unit 80. During the light-emitting phase, the light-emitting control signal controls the first light-emitting control transistor T4 and the second light-emitting control transistor T5 to conduct. The first power supply signal VDD is transmitted to the first electrode of the driving transistor Tdr through the first light-emitting control transistor T4. The driving transistor Tdr generates a driving current based on the data voltage of the gate and the first power supply signal VDD at the first electrode. The current is transmitted to the anode of light-emitting device D1 through the second light-emitting control transistor T5, driving the light-emitting device D1 to emit light.

[0050] In the initialization phase of the light emitting unit, when the initialization module 70 initializes the N1 node of the light emitting unit 80, the initialization process of the N1 node of the light emitting unit 80 can be equivalent to the discharge process of the RC circuit. Figure 3 FIG1 is an equivalent circuit diagram of a light emitting unit 80 in the initialization stage provided by an embodiment of the present invention. Figure 3As shown, the light-emitting unit 80 can be equivalent to a discharge circuit of a resistor R1 and a capacitor Cs, wherein the first end of the resistor R1 serves as the N1 node of the light-emitting unit 80 and is connected to the pixel circuit, the second end of the resistor R1 is connected to the first electrode of the capacitor Cs, and the second electrode of the capacitor Cs is connected to the second power supply signal VSS. In addition, the light-emitting unit 80 has a certain luminous efficiency attenuation after emitting light. Before the luminous efficiency of the light-emitting unit 80 attenuates, the value of the resistor R1 in the equivalent RC circuit of the light-emitting unit 80 is different from the value of the resistor R1 in the equivalent RC circuit of the light-emitting unit 80 after the luminous efficiency of the light-emitting unit 80 attenuates, so that the residual voltage of the first electrode of the light-emitting unit 80 is different before the initialization module 70 initializes the light-emitting unit 80. At the beginning of initialization, the potential of the first end of the resistor R1 is the residual voltage when the pixel circuit is operating in the previous frame. During the initialization process, the initialization module 70 is connected to the first end of the resistor R1, and the initialization module 70 is turned on under the control of the third scanning signal, providing a discharge path for the first end of the resistor R1, so that the potential of the first end of the resistor R1 is discharged to the second initialization voltage VREF2, thereby initializing the light-emitting unit 80. Among them, the current light-emitting unit 80 has attenuation, that is, the luminous efficiency of the light-emitting unit 80 has attenuation, which is generally a phenomenon that the luminous efficiency attenuates after the light-emitting unit 80 emits light for a certain period of time. The second initialization voltage can be used as a preset voltage, and the time for the residual voltage to discharge to the preset voltage is used as the first time. In addition, when the initialization module 70 provides a discharge path for the first end of the resistor R1, when the capacitance value of the capacitor Cs remains unchanged and the rate at which the residual voltage discharges to the preset voltage remains unchanged, the time for the residual voltage to discharge to the preset voltage is related to the residual voltage value. The greater the difference between the residual voltage and the preset voltage, the longer the discharge time.

[0051] S120, adjusting the data voltage according to the first time and the preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit attenuates.

[0052] Optionally, the state before attenuation of the light-emitting unit 80 refers to the state before the brightness of the light-emitting unit 80 attenuates to a certain percentage of the initial brightness value, and the state after attenuation of the light-emitting unit 80 refers to the state after the brightness of the light-emitting unit 80 attenuates to a certain percentage of the initial brightness value. For example, the state before the brightness of the light-emitting unit 80 attenuates to 95% of the initial brightness value is considered to be the state before attenuation, and the state after the brightness of the light-emitting unit 80 attenuates to 95% of the initial brightness value is considered to be the state after attenuation.

[0053] During the operation of the pixel circuit, after the data voltage is fixed, the driving current formed by the driving module 10 according to the data voltage is fixed, so that when the pixel circuit drives the light-emitting unit 80 to emit light, it is a voltage-controlled current constant current mode. Before the light-emitting unit 80 attenuates, the luminous efficiency of the light-emitting unit 80 has no attenuation or attenuates slightly, the resistance R1 in the equivalent discharge circuit of the light-emitting unit 80 is relatively small, and the residual voltage is relatively small. When the pixel circuit of the next frame works in the initialization stage of the light-emitting unit, the discharge time required for the residual voltage to discharge the light-emitting unit 80 through the initialization module 70 is relatively short, and is used as the preset time. When the luminous time of the light-emitting unit 80 increases, the light-emitting unit 80 attenuates, and the luminous efficiency decreases, the resistance R1 in the equivalent discharge circuit of the light-emitting unit 80 increases. At the same time, the driving current provided by the pixel circuit to the light-emitting unit 80 is constant, so that the residual voltage at the connection between the light-emitting unit 80 and the pixel circuit increases, that is, Figure 2 The residual voltage at node N1 in the pixel circuit increases. When the pixel circuit operates in the light-emitting unit initialization phase of the next frame, the discharge time required for the residual voltage to discharge the light-emitting unit 80 through the initialization module 70 is relatively long, that is, the first time is greater than the preset time. Since the capacitance value of capacitor Cs in the equivalent discharge circuit of the light-emitting unit 80 can be considered constant, the discharge rate of the light-emitting unit 80 remains unchanged. The difference between the first time and the preset time can be used to adjust the data voltage, thereby adjusting the drive current provided by the driver module 10 to the light-emitting unit 80, and further adjusting the brightness of the light-emitting unit 80, thereby reducing the difference in brightness before and after the luminous efficiency of the light-emitting unit 80 decays. For example, when the luminous efficiency of the light-emitting unit 80 decays, the brightness of the light-emitting unit 80 decreases at the same drive current. By adjusting the data voltage, the drive current formed by the driver module 10 based on the data voltage is increased, thereby increasing the brightness of the light-emitting unit 80 after the luminous efficiency decays, offsetting the difference in brightness caused by the luminous efficiency decay of the light-emitting unit 80, thereby slowing the brightness decay of the light-emitting unit 80 and improving the display quality and life of the display panel. Among them, the difference between the first time and the preset time is positively correlated with the luminous efficiency attenuation value of the light-emitting unit 80, the luminous efficiency attenuation value of the light-emitting unit 80 is positively correlated with the luminous brightness difference of the light-emitting unit 80, and the luminous brightness of the light-emitting unit 80 is related to the data voltage, so that the data voltage can be adjusted by the difference between the first time and the preset time, and then the luminous brightness of the light-emitting unit 80 can be adjusted.

[0054] For example, Figure 4 A discharge curve diagram of a different residual voltage discharged to a preset voltage provided by an embodiment of the present invention. The horizontal axis is time, the unit is microseconds (us), and the vertical axis is the residual voltage, the unit is volt (V). Figure 4 As shown, curve 1 is the residual voltage V at the N1 node before the luminous efficiency of the light-emitting unit 80 decays.OLED1 Discharge to the preset voltage V REF Curve 2 is the residual voltage V at the N1 node after the luminous efficiency of the light-emitting unit 80 decays. OLED2 Discharge to the preset voltage V REF From curve 1 and curve 2, we can see that the residual voltage V OLED2 The residual voltage V at node N1 is greater than that of curve 1. OLED1 When the luminous efficiency of the light-emitting unit 80 decays at different rates, the discharge rate of the residual voltage at the N1 node remains unchanged, such that the first time T1 for the residual voltage at the N1 node to discharge to a preset voltage in curve 2 is greater than the preset time T0 for the residual voltage at the N1 node to discharge to the preset voltage in curve 1. The data voltage is then adjusted based on the difference between the first time T1 and the preset time T0. This can offset the difference in luminous brightness of the light-emitting unit 80 caused by the decay of the luminous efficiency of the light-emitting unit 80 in subsequent processes, thereby improving the luminous brightness difference before and after the decay of the luminous efficiency of the light-emitting unit 80.

[0055] S130 , providing the adjusted data voltage to the driving module.

[0056] Among them, after the adjusted data voltage is provided to the driving module 10, the driving module 10 forms a driving current according to the data voltage of the gate and the first power signal VDD of the first electrode, and transmits it to the anode of the light-emitting device D1 through the second light-emitting control transistor T5, driving the light-emitting device D1 to emit light.

[0057] The technical solution of this embodiment obtains the first time for the initialization module to initialize the light-emitting unit to a preset voltage after the light-emitting unit attenuates, and then adjusts the data voltage according to the first time and the preset time, so that the driving current formed by the driving module according to the adjusted data voltage increases, thereby increasing the luminous brightness of the light-emitting unit after the luminous efficiency attenuates, at least partially offsetting the luminous brightness difference caused by the luminous efficiency attenuation of the light-emitting unit, thereby slowing down the brightness attenuation of the light-emitting unit and improving the display effect and life of the display panel.

[0058] Figure 5 Flowchart of another compensation method for a display panel provided by an embodiment of the present invention. Figure 5 As shown, the compensation method of the display panel specifically includes the following steps:

[0059] S210, when the initialization module starts to initialize the first electrode of the light-emitting unit after the light-emitting unit attenuates, start timing, and obtain the first electrode voltage of the light-emitting unit during the timing process;

[0060] Among them, reference Figure 2In the pixel circuit, when the first power signal VDD is high, the first power signal VSS is low, and the light-emitting unit 80 is a light-emitting device, the node N1 connecting the pixel circuit and the light-emitting unit 80 is the first electrode of the light-emitting unit 80. When the third scan signal S3 controls the initialization module 70 to turn on, the initialization module 70 begins to initialize the light-emitting unit 80. At this time, timing begins according to the changes in the third scan signal S3. As the initialization module 70 initializes the light-emitting unit 80, the equivalent discharge circuit of the light-emitting unit 80 continuously discharges through the initialization module 70, causing the voltage at the first electrode of the light-emitting unit 80 to change. By obtaining the first electrode voltage of the light-emitting unit 80, the completion status of the initialization module 70 can be determined. For example, when obtaining the first electrode voltage of the light-emitting unit 80, the first electrode voltage of the light-emitting unit 80 can be obtained by the driver chip of the display panel. The first electrode voltage of the light-emitting unit 80 can be obtained in real time to ensure the accuracy of the first electrode voltage of the light-emitting unit 80, or it can be obtained periodically to reduce the performance requirements of the driver chip. This is not limited here.

[0061] S220 , comparing the first electrode voltage of the light emitting unit with a preset voltage, continuing timing when the first electrode voltage of the light emitting unit is greater than the preset voltage, and ending timing when the first electrode voltage of the light emitting unit is not greater than the preset voltage, thereby determining a first time.

[0062] After the luminous efficiency of the light-emitting unit 80 decays, the residual voltage of the light-emitting unit 80 is relatively large, that is, the first-pole voltage of the light-emitting unit 80 is relatively large. At the beginning of the initialization phase of the light-emitting unit 80, the first-pole voltage of the light-emitting unit 80 is greater than the preset voltage, at which point timing begins. During the initialization phase of the light-emitting unit 80, the first-pole voltage of the light-emitting unit 80 continues to discharge, and the first-pole voltage of the light-emitting unit 80 remains greater than the preset voltage, at which point timing continues. When the first-pole voltage of the light-emitting unit 80 discharges to the preset voltage, the initialization phase of the light-emitting unit 80 ends, and the discharge process of the light-emitting unit 80 is complete. At this point, timing stops, and the first time is determined based on the timing.

[0063] Optionally, comparing the first electrode voltage of the light-emitting unit with a preset voltage, continuing timing when the first electrode voltage of the light-emitting unit is greater than the preset voltage, and ending timing when the first electrode voltage of the light-emitting unit is no greater than the preset voltage, to determine the first time, includes:

[0064] Comparing the first electrode voltage of the light emitting unit with a preset voltage through a comparator, and outputting the comparison result to a counter;

[0065] The acquired first-pole voltage of the light-emitting unit 80 can be transmitted to one input of a comparator, and a preset voltage is input to the other input of the comparator. The comparator can then compare the first-pole voltage of the light-emitting unit 80 with the preset voltage. When the first-pole voltage of the light-emitting unit 80 is greater than the preset voltage, the comparator outputs a first voltage signal; when the first-pole voltage of the light-emitting unit 80 is less than the preset voltage, the comparator outputs a second voltage signal. The first voltage signal or the second voltage signal is then transmitted to a counter. For example, the comparator can be integrated into a driver chip. After acquiring the first-pole voltage of the light-emitting unit 80, the driver chip can transmit the first-pole voltage of the light-emitting unit 80 to the positive-inverting input of the comparator, while simultaneously inputting the preset voltage to the negative-inverting input of the comparator. When the first-pole voltage of the light-emitting unit 80 is greater than the preset voltage, the first voltage signal output by the comparator is a high-level signal; when the first-pole voltage of the light-emitting unit 80 is less than the preset voltage, the second voltage signal output by the comparator is a low-level signal.

[0066] It should be noted that, in other embodiments, the first voltage of the light-emitting unit 80 can be transmitted to the negative input terminal of the comparator, while the positive input terminal of the comparator inputs a preset voltage. In this case, the first voltage signal output by the comparator is a low-level signal, and the second voltage signal is a high-level signal, which is not limited here.

[0067] The comparison result is received by the counter, and pulse counting is continued when the comparison result shows that the first pole voltage of the light emitting unit is greater than the preset voltage, and pulse counting is ended when the comparison result shows that the first pole voltage of the light emitting unit is not greater than the preset voltage.

[0068] The first voltage signal output by the comparator can serve as an enable signal for the counter. Upon receiving the enable signal, the counter can begin counting pulses. When the comparator outputs the second voltage signal, the counter stops counting pulses, thereby counting the number of pulses when the voltage at the first electrode of the light-emitting unit is greater than a preset voltage.

[0069] The first time is determined according to the number of pulses and the pulse period obtained by counting the counter.

[0070] After the number of pulses when the voltage of the first electrode of the light emitting unit is greater than the preset voltage is determined by the counter, the first time can be determined according to the number of pulses and the pulse period, wherein the first time is the product of the number of pulses and the pulse period.

[0071] S230, adjusting the data voltage according to the first time and the preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit turns on attenuation;

[0072] S240 , providing the adjusted data voltage to the driving module.

[0073] Figure 6 Flowchart of another compensation method for a display panel provided by an embodiment of the present invention. Figure 6 As shown, the compensation method of the display panel specifically includes the following steps:

[0074] S310, obtaining the first time for the initialization module to initialize the light-emitting unit to a preset voltage after the light-emitting unit attenuates;

[0075] S320, determining a time difference between the first time and the preset time;

[0076] The preset time may be pre-stored in the display panel. After determining the first time, a time difference between the first time and the preset time may be determined by subtraction. If the first time is greater than the preset time, the subtraction may be performed using a calculation function of the driver chip.

[0077] S330, determining a target compensation voltage according to the time difference; wherein the time difference is positively correlated with the target compensation voltage;

[0078] The target compensation voltage is the adjustment value of the data voltage. The time difference between the first time and the preset time is positively correlated with the luminous efficiency decay value of the light-emitting unit 80. The luminous efficiency decay value of the light-emitting unit 80 is positively correlated with the difference in the light-emitting brightness of the light-emitting unit 80. The greater the difference in the light-emitting brightness of the light-emitting unit 80, the greater the voltage value that needs to be adjusted for the data voltage. Therefore, it can be determined that the time difference is positively correlated with the target compensation voltage. After determining the time difference, the target compensation voltage can be directly determined based on the time difference for subsequent adjustment of the data voltage.

[0079] Optionally, determining the target compensation voltage according to the time difference includes:

[0080] According to the correspondence between the preset time difference and the compensation voltage, the compensation voltage corresponding to the time difference between the first time and the preset time is determined, and the compensation voltage is the target compensation voltage.

[0081] Before determining the target compensation voltage based on the time difference, the corresponding relationship between the time difference and the compensation voltage can be determined through an aging test of the light-emitting unit and then stored in a storage unit. The corresponding relationship between the time difference and the compensation voltage can be in the form of a matching curve table or a functional relationship. Specifically, the corresponding relationship between the time difference and the compensation voltage can be a functional formula between the time difference and the compensation voltage. The time difference between the first time and the preset time can be substituted into the functional formula between the time difference and the compensation voltage to calculate the target compensation voltage. The corresponding relationship between the time difference and the compensation voltage is not limited here.

[0082] For example, when the correspondence between time differences and compensation voltages is in the form of a matching curve table, each time difference in the matching curve table corresponds to a compensation voltage. Therefore, after determining the time difference between the first time and the preset time, the target compensation voltage corresponding to the time difference can be determined by looking up the table. When determining the correspondence between time differences and compensation voltages through an aging test of a light-emitting unit, the luminance differences corresponding to different aging levels of the light-emitting unit can be first determined. The luminance differences corresponding to different aging levels can be determined by subtracting the current luminances of the light-emitting unit at different aging levels. Then, the data voltage is adjusted based on the luminance of the light-emitting unit at different aging levels, so that the luminance differences of the light-emitting unit at different aging levels are less than a preset value. The adjusted data voltage value is recorded as the compensation voltage. The preset value can be set as needed, for example, it can be less than the luminance difference observable to the human eye. Finally, the degree of luminous efficiency degradation of the light-emitting unit at different aging levels can be determined. The degree of degradation can be characterized by the time required for the first electrode voltage of the light-emitting unit to discharge to the preset voltage. Thus, the correspondence between time differences and compensation voltages can be determined and stored in a storage unit. The storage unit can be integrated into the driver chip.

[0083] S340 , adjusting the data voltage according to the target compensation voltage.

[0084] Exemplarily, adjusting the data voltage according to the target compensation voltage may specifically include: calculating the sum of the target compensation voltage and the data voltage before adjustment to obtain the adjusted data voltage.

[0085] Among them, after determining the target compensation voltage, the data voltage is adjusted according to the target compensation voltage, so that the driving current formed by the driving module 10 according to the data voltage and the first power supply signal VDD is increased, thereby increasing the luminous brightness of the light-emitting unit 80 after the luminous efficiency is attenuated, offsetting the luminous brightness difference caused by the attenuation of the luminous efficiency of the light-emitting unit 80, thereby slowing down the brightness attenuation of the light-emitting unit 80 and improving the display effect and life of the display panel.

[0086] S350 , providing the adjusted data voltage to the driving module.

[0087] On the basis of the above technical solutions, before obtaining the first time for the initialization module to initialize the light-emitting unit to the preset voltage, the method further includes:

[0088] The preset time for the initialization module to initialize the light emitting unit to a preset voltage before the light emitting unit attenuates is obtained and stored.

[0089] Before obtaining the first time for the initialization module to initialize the light-emitting unit to the preset voltage, it is also necessary to obtain a preset time for the initialization module to initialize the light-emitting unit to the preset voltage when the light-emitting efficiency of the light-emitting unit does not decay, and store the preset time so that the preset time can be called when subsequently adjusting the data voltage based on the first time and the preset time. The preset time can be stored in a storage unit, for example, the storage unit can be a flash memory external to the display panel.

[0090] Exemplarily, when the luminous efficiency of the light-emitting unit remains unchanged, the process of obtaining the preset time is similar to the process of obtaining the first time the initialization module initializes the light-emitting unit to a preset voltage. Specifically, when the luminous efficiency of the light-emitting unit remains unchanged, the initialization module begins timing when it begins initializing the first electrode of the light-emitting unit. During the timing process, the voltage of the first electrode of the light-emitting unit is obtained. The voltage of the first electrode of the light-emitting unit is then compared with the preset voltage. Timing continues when the voltage of the first electrode of the light-emitting unit is greater than the preset voltage, and ends when the voltage of the first electrode of the light-emitting unit is no greater than the preset voltage, thereby determining the preset time. A comparator can compare the voltage of the first electrode of the light-emitting unit with the preset voltage and output the comparison result to a counter. The counter receives the comparison result and continues counting pulses when the comparison result indicates that the voltage of the first electrode of the light-emitting unit is greater than the preset voltage, and ends counting pulses when the comparison result indicates that the voltage of the first electrode of the light-emitting unit is no greater than the preset voltage. This allows the number of pulses to be counted when the voltage of the first electrode of the light-emitting unit is greater than the preset voltage, and the preset time is then determined based on the number of pulses counted by the counter and the pulse period.

[0091] It should be noted that when the preset time is obtained through a comparator and a counter, the comparator and the counter can be integrated into the driver chip. In addition, when the first time is obtained through a comparator and a counter, the driver chip can include multiple comparators and counters for respectively obtaining the preset time and the first time.

[0092] The embodiment of the present invention also provides a compensation device for a display panel, which is used to compensate for the luminous brightness attenuation phenomenon caused by the reduction of the luminous efficiency of the luminous unit in the display panel, thereby slowing down the brightness attenuation of the luminous unit and improving the display effect and life of the display panel. Figure 2 The display panel includes a light-emitting unit 80 and a pixel circuit that drives the light-emitting unit 80 to emit light. The pixel circuit includes a driving module 10 and an initialization module 70. The driving module 10 and the initialization module 70 are both connected to the light-emitting unit 80. The initialization module 70 is used to initialize the light-emitting unit 80. The driving module 10 is used to form a driving current according to the data voltage to drive the light-emitting unit 80 to emit light. Figure 7 Schematic diagram of the structure of a compensation device for a display panel provided by an embodiment of the present invention. Figure 7 As shown, the compensation device for the display panel includes an acquisition module 100, an adjustment module 200, and a providing module 300. The acquisition module 100 is used to obtain a first time after the light-emitting unit 80 decays and the initialization module 70 initializes the light-emitting unit 80 to a preset voltage; the adjustment module 200 is used to adjust the data voltage according to the first time and the preset time; wherein the preset time is the time before the light-emitting unit 80 decays and the initialization module 70 initializes the light-emitting unit 80 to the preset voltage; and the providing module 300 is used to provide the adjusted data voltage to the driving module 10.

[0093] The technical solution of this embodiment is to obtain the first time after the light-emitting unit attenuates by the initialization module, initialize the light-emitting unit to a preset voltage, and then adjust the data voltage according to the first time and the preset time by the adjustment module, and provide the adjusted data voltage to the driving module through the providing module, so that the driving current formed by the driving module according to the adjusted data voltage is increased, thereby increasing the luminous brightness of the light-emitting unit after the luminous efficiency attenuates, at least partially offsetting the luminous brightness difference caused by the luminous efficiency attenuation of the light-emitting unit, thereby slowing down the brightness attenuation of the light-emitting unit and improving the display effect and life of the display panel.

[0094] Based on the above technical solutions, continue to refer to Figure 7 The acquisition module 100 includes an acquisition unit 110 and a determination unit 120; the acquisition unit 110 is connected to the light-emitting unit 80, and the acquisition unit 110 is used to obtain the first pole voltage of the light-emitting unit 80 when the initialization module 170 starts to initialize the first pole of the light-emitting unit 80 after the light-emitting unit 80 attenuates; the determination unit 120 is connected to the acquisition unit 110, and the determination unit 120 is used to compare the first pole voltage of the light-emitting unit 80 with a preset voltage, and start timing when the first pole voltage of the light-emitting unit 80 is greater than the preset voltage, and end timing until the first pole voltage of the light-emitting unit 80 is no greater than the preset voltage, and determine the first time.

[0095] The acquisition unit 110 is connected to the light-emitting unit 80. When the initialization module 70 begins to initialize the light-emitting unit 80, the acquisition unit 110 begins to acquire the first-pole voltage of the light-emitting unit 80. For example, the acquisition unit 110 may be a voltage sensing structure for sensing the first-pole voltage of the light-emitting unit 80. After acquiring the first-pole voltage of the light-emitting unit 80, the acquisition unit 110 transmits the first-pole voltage of the light-emitting unit 80 to the determination unit 120. Simultaneously, the determination unit 120 acquires a preset voltage and compares the first-pole voltage of the light-emitting unit 80 with the preset voltage. When the first-pole voltage of the light-emitting unit 80 is greater than the preset voltage, timing is started. Timing ends when the first-pole voltage of the light-emitting unit 80 is no greater than the preset voltage, thereby determining the first time.

[0096] Figure 8 This is a schematic diagram of the structure of another compensation device for a display panel provided by an embodiment of the present invention. Figure 8 As shown, the determination unit 120 includes a comparator P1, a counter M1 and a determination sub-unit 121; the positive input terminal P+ of the comparator P1 is connected to the acquisition unit 110, and the negative input terminal P- of the comparator P1 is connected to the preset voltage input terminal V1. The comparator P1 is used to compare the first pole voltage of the light-emitting unit 80 with the preset voltage, and output the comparison result through the output terminal of the comparator P1; the output terminal Pout of the comparator P1 is connected to the enable input terminal EN of the counter M1; the counter M1 is used to receive the comparison result, and continue to count pulses when the comparison result is that the first pole voltage of the light-emitting unit 80 is greater than the preset voltage, until the pulse counting is ended when the comparison result is that the first pole voltage of the light-emitting unit 80 is not greater than the preset voltage; the determination sub-unit 121 is connected to the counter M1, and the determination sub-unit 121 is used to determine the first time according to the number of pulses and the pulse period counted by the counter M1.

[0097] The preset voltage input terminal V1 is used to provide a preset voltage. The positive input terminal P+ of the comparator P1 can input the first pole voltage of the light-emitting unit 80, and the negative input terminal P- of the comparator P- can input the preset voltage. When the first pole voltage of the light-emitting unit 80 is greater than the preset voltage, the output terminal Pout of the comparator P1 outputs a high-level first voltage signal, which serves as an enable signal for the counter M1, causing the counter M1 to start counting pulses. When the first pole voltage of the light-emitting unit 80 is less than or equal to the preset voltage, the output terminal Pout of the comparator P1 outputs a low-level second voltage signal, which is transmitted to the enable input terminal EN of the counter M1, controlling the counter M1 to stop counting pulses. In this way, the number of pulses when the first pole voltage of the light-emitting unit 80 is greater than the preset voltage can be calculated. Then, the determination subunit 121 can determine the first time based on the number of pulses and pulse period counted by the counter M1.

[0098] On the basis of the above technical solutions, the adjustment module may further include:

[0099] A first determining unit, configured to determine a time difference between a first time and a preset time;

[0100] a second determining unit, configured to determine a compensation voltage according to the time difference; wherein the time difference is positively correlated with the compensation voltage;

[0101] The regulating unit is configured to regulate the data voltage according to the compensation voltage.

[0102] On the basis of the above technical solutions, the second determining unit is specifically configured to determine the compensation voltage corresponding to the time difference between the first time and the preset time according to a correspondence between the preset time difference and the compensation voltage.

[0103] On the basis of the above technical solutions, the compensation device of the display panel further includes:

[0104] The acquisition storage module is used to acquire and store the preset time that the initialization module initializes the light emitting unit to a preset voltage before the light emitting unit attenuates.

[0105] An embodiment of the present invention further provides a display device. Figure 9 Schematic diagram of the structure of a display device provided by an embodiment of the present invention. Figure 9 As shown, the display device includes a display panel 101 and a compensation device 201 for a display panel provided by any embodiment of the present invention.

[0106] The display panel 101 includes a light-emitting unit 80 and a pixel circuit that drives the light-emitting unit 80 to emit light. The pixel circuit includes a driving module 10 and an initialization module 70. Both the driving module 10 and the initialization module 70 are connected to the light-emitting unit 80. The initialization module 70 is used to initialize the light-emitting unit 80. The driving module 10 is used to generate a driving current based on a data voltage to drive the light-emitting unit 80 to emit light. The compensation device 201 of the display panel includes an acquisition module 100, an adjustment module 200, and a provision module 300. The acquisition module 100 is used to acquire a first time after the light-emitting unit attenuates and the initialization module 70 initializes the light-emitting unit 80 to a preset voltage; the adjustment module 200 is used to adjust the data voltage based on the first time and the preset time; wherein the preset time is the time before the light-emitting unit 80 attenuates and the initialization module 70 initializes the light-emitting unit 80 to the preset voltage; and the provision module 300 is used to provide the adjusted data voltage to the driving module 10. The acquisition module 100 obtains the first time after the initialization module 70 initializes the light-emitting unit 80 to a preset voltage after the light-emitting unit decays. The adjustment module 200 then adjusts the data voltage according to the first time and the preset time, and the provision module 300 provides the adjusted data voltage to the driver module 10, causing the driver module 10 to increase the driving current formed according to the adjusted data voltage, thereby increasing the luminous brightness of the light-emitting unit 80 after the luminous efficiency decays, at least partially offsetting the luminous brightness difference caused by the luminous efficiency decay of the light-emitting unit 80, thereby slowing the luminance decay of the light-emitting unit 80 and improving the display effect and lifespan of the display panel 101. For example, the compensation device 201 of the display panel can be integrated into the driver chip of the display panel.

[0107] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A compensation method for a display panel, characterized in that: The display panel includes a light-emitting unit and a pixel circuit for driving the light-emitting unit to emit light. The pixel circuit includes a driving module and an initialization module. Both the driving module and the initialization module are connected to the light-emitting unit. The initialization module is used to initialize the light-emitting unit. The driving module is used to generate a driving current according to a data voltage to drive the light-emitting unit to emit light. The compensation method includes: Acquire a first time for the initialization module to initialize the light emitting unit to a preset voltage after the light emitting unit attenuates; The data voltage is adjusted according to the first time and a preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit decays; providing an adjusted data voltage to the driving module; Acquiring a first time for the initialization module to initialize the light emitting unit to a preset voltage after the light emitting unit attenuates, including: After the light emitting unit decays and the initialization module starts to initialize the first electrode of the light emitting unit, timing is started, and the voltage of the first electrode of the light emitting unit is obtained during the timing process; The first electrode voltage of the light-emitting unit is compared with the preset voltage, and timing is continued when the first electrode voltage of the light-emitting unit is greater than the preset voltage, and timing is ended until the first electrode voltage of the light-emitting unit is no greater than the preset voltage to determine the first time.

2. The display panel compensation method according to claim 1, wherein: Comparing the first electrode voltage of the light-emitting unit with the preset voltage, continuing timing when the first electrode voltage of the light-emitting unit is greater than the preset voltage, and ending timing when the first electrode voltage of the light-emitting unit is no greater than the preset voltage, and determining the first time, includes: Comparing the first electrode voltage of the light emitting unit with the preset voltage by a comparator, and outputting the comparison result to a counter; receiving the comparison result through the counter, and continuing pulse counting when the comparison result shows that the voltage at the first pole of the light-emitting unit is greater than the preset voltage, and ending pulse counting when the comparison result shows that the voltage at the first pole of the light-emitting unit is not greater than the preset voltage; The first time is determined according to the number of pulses and the pulse period counted by the counter.

3. The display panel compensation method according to claim 1, wherein: Adjusting the data voltage according to the first time and the preset time includes: determining a time difference between the first time and the preset time; determining a target compensation voltage according to the time difference; wherein the time difference is positively correlated with the target compensation voltage; The data voltage is adjusted according to the target compensation voltage.

4. The display panel compensation method according to claim 3, wherein: Determining a target compensation voltage according to the time difference includes: According to the correspondence between the preset time difference and the compensation voltage, a target compensation voltage corresponding to the time difference between the first time and the preset time is determined.

5. The display panel compensation method according to claim 1, wherein: Before the first time when the initialization module initializes the light emitting unit to a preset voltage after obtaining the attenuation of the light emitting unit, the method further includes: The preset time for the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit attenuates is obtained and stored.

6. A compensation device for a display panel, characterized in that: The display panel includes a light-emitting unit and a pixel circuit for driving the light-emitting unit to emit light. The pixel circuit includes a driving module and an initialization module. Both the driving module and the initialization module are connected to the light-emitting unit. The initialization module is used to initialize the light-emitting unit. The driving module is used to generate a driving current according to a data voltage to drive the light-emitting unit to emit light. The compensation device comprises: An acquisition module, configured to acquire a first time when the initialization module initializes the light emitting unit to a preset voltage after the light emitting unit attenuates; an adjusting module, configured to adjust the data voltage according to the first time and a preset time; wherein the preset time is the time taken by the initialization module to initialize the light emitting unit to the preset voltage before the light emitting unit attenuates; providing a module for providing an adjusted data voltage to the driving module; The acquisition module includes an acquisition unit and a determination unit; The acquisition unit is configured to acquire the voltage of the first electrode of the light emitting unit when the initialization module starts to initialize the first electrode of the light emitting unit after the light emitting unit decays; The determination unit is used to compare the first pole voltage of the light-emitting unit with the preset voltage, start timing when the first pole voltage of the light-emitting unit is greater than the preset voltage, and end timing when the first pole voltage of the light-emitting unit is no greater than the preset voltage to determine the first time.

7. The compensation device for a display panel according to claim 6, wherein: The determining unit includes a comparator, a counter and a determining subunit; The positive input terminal of the comparator is connected to the acquisition unit, and the negative input terminal of the comparator is connected to the preset voltage input terminal. The comparator is used to compare the first electrode voltage of the light-emitting unit with the preset voltage and output the comparison result through the output terminal of the comparator; the output terminal of the comparator is connected to the enable input terminal of the counter; The counter is used to receive the comparison result, and continue to count pulses when the comparison result shows that the voltage of the first electrode of the light-emitting unit is greater than the preset voltage, and end the pulse counting when the comparison result shows that the voltage of the first electrode of the light-emitting unit is not greater than the preset voltage; The determining subunit is connected to the counter, and is configured to determine the first time according to the number of pulses and the pulse period counted by the counter.

8. A display device, characterized in that: A compensation device comprising a display panel and the display panel according to any one of claims 6 to 7.

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