Display device and display control method

Abstract

The invention discloses a display device and a display control method, a display panel comprises a plurality of sub-pixels, each sub-pixel comprises a light emitting device, a driving unit and a reset unit, the driving unit is configured to drive the light emitting device to emit light, and the reset unit is configured to transmit a reset signal to an anode of the light emitting device. And the anode potential of the light-emitting device is reset. The adjustment control module adjusts the voltage of the reset signal according to at least one of the refresh frequency of the display panel, the accumulated working time of the display panel and the temperature of the environment where the display panel is located so as to adjust the light-emitting time of each light-emitting device in the current frame, and therefore adjustment of the light-emitting brightness of the light-emitting devices is achieved. Moreover, the brightness of the sub-pixels displaying the low-gray-scale content can be obviously adjusted by adjusting the light-emitting duration of the light-emitting device, so that the low-gray-scale brightness deviation can be improved.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a display device and a display control method. Background Technology

[0002] Because the human eye's perception of brightness is non-linear, the brightness changes corresponding to low grayscale levels on a display panel are more easily perceived by the human eye. To ensure that the human eye perceives uniform and natural brightness variations, display panels with different driving characteristics or using different driving methods require numerous gamma curves to adjust the gamma circuitry to meet varying needs, thereby improving low grayscale brightness deviation. Therefore, adjusting low grayscale brightness deviation is quite complex. Summary of the Invention

[0003] This application provides a display device and a display control method, which can be used to improve low grayscale brightness deviation.

[0004] This application provides a display device, including a display panel and an adjustment control module. The display panel includes a plurality of sub-pixels, each sub-pixel including a light-emitting device, a driving unit, and a reset unit. The driving unit is configured to drive the light-emitting device to emit light, and the reset unit is configured to transmit a reset signal to the anode of the light-emitting device to reset the potential of the anode. The adjustment control module is electrically connected to the plurality of sub-pixels, and the adjustment control module is configured to adjust the voltage of the reset signal according to at least one of the refresh rate of the display panel, the cumulative operating time of the display panel, and the ambient temperature of the display panel, so as to adjust the light emission duration of each light-emitting device in the current frame.

[0005] This application provides a display control method for controlling a display panel to display. The display panel includes multiple sub-pixels, each sub-pixel including a light-emitting device, a driving unit, and a reset unit. The driving unit is configured to drive the light-emitting device to emit light, and the reset unit is configured to transmit a reset signal to the anode of the light-emitting device to reset the potential of the anode. The display control method includes adjusting the voltage of the reset signal according to at least one of the refresh rate of the display panel, the cumulative operating time of the display panel, and the ambient temperature of the display panel, thereby adjusting the light-emitting duration of the light-emitting device.

[0006] In the above technical solution, the reset unit of each sub-pixel transmits a reset signal to the anode of the light-emitting device to reset the anode potential of the light-emitting device, thereby stabilizing the anode potentials of the light-emitting devices of multiple sub-pixels. By adjusting the voltage of the reset signal according to at least one of the refresh rate of the display panel, the cumulative working time of the display panel, and the ambient temperature of the display panel, the light-emitting duration of each light-emitting device in the current frame is adjusted, thereby adjusting the brightness of the light-emitting device. Moreover, adjusting the light-emitting duration of the light-emitting device can significantly adjust the brightness of sub-pixels displaying low grayscale content, thus improving low grayscale brightness deviation. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0008] Figure 1 A schematic diagram illustrating the input signal and brightness provided in the embodiments of this application; Figures 2A-2B This is a schematic diagram showing the relationship between the input signal, output signal, and brightness provided in an embodiment of this application. Figure 3 A schematic block diagram of a display device provided in an embodiment of this application; Figure 4 A circuit diagram of the pixel circuit for a sub-pixel provided in an embodiment of this application; Figure 5 For the corresponding Figure 4 The timing diagram of the pixel circuit shown; Figures 6A-6B A schematic diagram illustrating the changes in anode voltage and the light-emitting state of the light-emitting device during the charging and light-emitting periods, as provided in the embodiments of this application; Figure 7 A schematic diagram illustrating the changes in the luminous state of a light-emitting device corresponding to different gray levels, provided in an embodiment of this application; Figures 8A-8B This is a schematic diagram illustrating the changes in the luminous state of the light-emitting device corresponding to different gray levels at different refresh frequencies, as provided in the embodiments of this application. Figures 9A-9B This is a schematic diagram illustrating the relationship between frequency and brightness ratio provided in an embodiment of this application; Figures 10A-10B A schematic diagram illustrating the voltage change of the first power signal provided in an embodiment of this application; Figure 11A schematic diagram showing the relationship between the voltage of the first power signal and the voltage of the second power signal and time, provided in an embodiment of this application; Figures 12A-12C A flowchart of a display control method provided in an embodiment of this application.

[0009] The realization of the objectives, functional features and advantages of the embodiments of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0011] It should be noted that the electrical connection referred to in this application can include both direct and indirect connections. Indirect connections can include connections between connected modules, devices, and nodes achieved through electrical components, wired or wireless media, etc. An electrical connection can refer to a physically existing connection or a connection established through signals.

[0012] Furthermore, descriptions involving "first," "second," etc., in the embodiments of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the various technical features in this application can be applied to achieve different combinations, and are not limited to the technical solutions formed by the combinations listed in the embodiments. Technical solutions between different embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application. The terms "optionally" and "in some embodiments" used in this application indicate that the technical content they refer to can be selectively configured.

[0013] Furthermore, the descriptions provided in the Background section should not be presumed to be prior art simply because they are mentioned in or associated with the description in the Background section. The Background section may include information describing one or more aspects of the subject matter, and the description in this section does not limit the invention.

[0014] like Figure 1 This is a block diagram illustrating the principle of the input signal and brightness provided in the embodiments of this application. Figures 2A-2B This diagram illustrates the relationship between the input signal, output signal, and brightness, as provided in an embodiment of this application. The gamma circuit converts the input signal into an output signal and outputs it to the display panel, causing the display panel to show the corresponding brightness. The input signal can correspond to an image data signal.

[0015] However, the mapping relationship between brightness and input signal differs for display panels with different driving characteristics or using different driving methods. Therefore, even with the same input signal, the brightness-input signal relationship curves exhibited by display panels with different driving characteristics or using different driving methods will not be the same. Figures 2A-2B As shown in La and Lb. Therefore, it is often necessary to adjust the gamma circuit to regulate the relationship between the input signal received by the gamma circuit and the output signal of the gamma circuit, so that the brightness-input signal relationship curves exhibited by display panels with different driving characteristics or using different driving methods are the same, such as... Figures 2A-2B The values ​​Lc and Ld are shown in the diagram. Adjusting the gamma circuit requires a large number of gamma curves, making the brightness adjustment method quite complex.

[0016] Furthermore, because the human eye's perception of brightness is non-linear, the brightness changes corresponding to low grayscale levels on a display panel are more easily perceived by the human eye. Therefore, when display panels with different driving characteristics or using different driving methods achieve low grayscale display, the relationship curve between the brightness of the display panel and the input signal will differ, resulting in brightness deviations that are more easily perceived by the human eye when the display panel is displaying low grayscale. Adjusting the gamma circuit using numerous gamma curves to adjust the brightness and thus improve low grayscale brightness deviation is a complex process.

[0017] Therefore, this application provides a display device and a display control method to improve the above-mentioned problems.

[0018] like Figure 3 This is a schematic block diagram of a display device provided in an embodiment of this application. Figure 4 A circuit diagram of the pixel circuit for a sub-pixel provided in an embodiment of this application.

[0019] This application provides a display device, including a display panel 10 and an adjustment control module 20. The adjustment control module 20 is electrically connected to the display panel 10 and is configured to control the display panel 10 to display.

[0020] The display panel 10 includes a plurality of sub-pixels Spx, each sub-pixel Spx including a light-emitting device Le and a pixel circuit. The light-emitting device Lex is electrically connected to the pixel circuit, and the pixel circuit is configured to drive the light-emitting device Lex to emit light, so as to realize the display function of the display panel 10 through the light-emitting device Lex.

[0021] It should be noted that one pixel circuit can be set for each light-emitting device Le. Alternatively, one pixel circuit can be set for multiple light-emitting devices Le, allowing multiple light-emitting devices Le to share the same pixel circuit.

[0022] Optionally, the light-emitting device Le may include at least one of organic light-emitting diodes, sub-millimeter light-emitting diodes, and micro light-emitting diodes.

[0023] Please continue reading. Figure 3 The pixel circuit may include a driving unit 101 and a reset unit 102. The driving unit 101 is electrically connected to the light-emitting device Le and is configured to drive the light-emitting device Le to emit light. The reset unit 102 is electrically connected to the anode of the light-emitting device Le and is configured to transmit a reset signal VI to the anode of the light-emitting device Le to reset the potential of the anode.

[0024] Optionally, the driving unit 101 is configured to generate a driving current to drive the light-emitting device Le to emit light. The cathode of the light-emitting device Le is electrically connected to the first power supply terminal OVSS, and the anode of the light-emitting device Le is electrically connected to the second power supply terminal OVDD through the driving unit 101.

[0025] It should be noted that resetting the anode potential with the reset signal VI means that before a path for the driving current is formed between the first power supply terminal OVSS and the second power supply terminal OVDD, the anode potential of the light-emitting device Le is made to correspond to the voltage of the reset signal VI. That is, when a path for the driving current is formed between the first power supply terminal OVSS and the second power supply terminal OVDD, the anode potential of the light-emitting device Le changes from the voltage Vi corresponding to the reset signal VI to the lighting voltage Vo.

[0026] To control the content displayed in sub-pixels Spx, the display panel 10 may include multiple data lines DL, each data line DL being configured to transmit a corresponding data signal. The pixel circuit of each sub-pixel Spx may also include a data writing unit 103, which is electrically connected between the corresponding data line DL and the driving unit 101. The data writing unit 103 is configured to control the on / off state of the current path between the corresponding data line DL and the driving unit 101 according to the second scan signal Scan2.

[0027] In some embodiments, in order to reduce the impact of the threshold voltage of the driving transistor Tdr on the driving current, the pixel circuit may further include a compensation unit 104, which is configured to write the information of the threshold voltage of the driving transistor Tdr to the gate of the driving transistor Tdr.

[0028] In some embodiments, to prevent the light-emitting device Le from emitting light unnecessarily, the pixel circuit may further include a switching unit. The switching unit may include at least one of a first switching unit 105 and a second switching unit 106. The first switching unit 105 is electrically connected between the second power supply terminal OVDD and the driving unit 101, and the second switching unit 106 is electrically connected between the driving unit 101 and the light-emitting device Le. The switching unit is configured to control, according to the light emission control signal EM, whether a current path for driving current to flow is formed between the first power supply terminal OVSS and the second power supply terminal OVDD.

[0029] In some embodiments, in order to reduce the influence of residual charge on the driving current generated by the driving unit 101, the pixel circuit may further include an initialization unit 107. The initialization unit 107 is electrically connected between the initialization signal line and the driving unit 101. The initialization unit 107 is configured to control the on / off of the current path between the initialization signal line and the driving unit 101 according to the first scan signal Scan1.

[0030] In some embodiments, the reset signal line VL that transmits the reset signal VI is multiplexed as an initialization signal line to reduce the number of signal lines included in the pixel circuit.

[0031] In order for the driving unit 101 to generate a stable driving current according to the data signal, the pixel circuit may also include a potential maintenance unit 108, which is electrically connected to the driving unit 101.

[0032] like Figure 4 This is a circuit diagram of the pixel circuit for a sub-pixel provided in an embodiment of this application. Figure 5 For the corresponding Figure 4 The timing diagram of the pixel circuit is shown. For ease of understanding this application, [the diagram is presented in the format shown]. Figure 4 The pixel circuit shown and Figure 5 The timing sequence shown is used as an example for explanation.

[0033] The driving unit 101 may include a driving transistor Tdr. The control terminal of the driving transistor Tdr is electrically connected to the first node No1. The first source-drain terminal of the driving transistor Tdr is electrically connected to the second node No2. The second source-drain terminal of the driving transistor Tdr is electrically connected to the light-emitting device Le through the third node No3. The driving transistor Tdr is configured to generate a driving current according to the corresponding data signal to drive the light-emitting device Le to emit light.

[0034] The reset unit 102 may include a reset transistor Ti. The control terminal of the reset transistor Ti is configured to receive a first scan signal Scan1. The first source-drain terminal of the reset transistor Ti is electrically connected to the reset signal line VL. The second source-drain terminal of the reset transistor Ti is electrically connected to the anode of the light-emitting device Le. The reset signal line VL is configured to transmit a reset signal VI. The reset transistor Ti is configured to control the on / off state of the current path between the reset signal line VL and the anode according to the first scan signal Scan1.

[0035] Optionally, the data writing unit 103 may include a data transistor Tda, the control terminal of the data transistor Tda is configured to receive a second scan signal Scan2, the first source-drain terminal of the data transistor Tda is electrically connected to the corresponding data line, the second source-drain terminal of the data transistor Tda is electrically connected to the second node No2, and the data transistor Tda is configured to control the on / off state of the current path between the corresponding data line DL and the second node No2 according to the second scan signal Scan2.

[0036] Optionally, the compensation unit 104 may include a compensation transistor Tc, the control terminal of which is configured to receive a second scan signal Scan2, the first source-drain terminal of which is electrically connected to a third node No3, the second source-drain terminal of which is electrically connected to a first node No1, and the compensation transistor Tc is configured to control the on / off state of the current path between the first node No1 and the third node No3 according to the second scan signal Scan2.

[0037] Optionally, the potential maintenance unit 108 includes a storage capacitor Cst, which is electrically connected between the second power supply terminal OVDD and the first node No1.

[0038] In some embodiments, the pixel circuit further includes a first switching unit 105 and a second switching unit 106. The first switching unit 105 includes a first switching transistor Ts1, and the second switching unit 106 includes a second switching transistor Ts2. The control terminals of the first switching transistor Ts1 and the second switching transistor Ts2 are configured to receive a light emission control signal EM. The first source-drain terminal of the first switching transistor Ts1 is electrically connected to the second power supply terminal OVDD, the second source-drain terminal of the first switching transistor Ts1 is electrically connected to the second node No2, the first source-drain terminal of the second switching transistor Ts2 is electrically connected to the third node No3, and the second source-drain terminal of the first switching transistor Ts1 is electrically connected to the anode of the corresponding light-emitting device Le. The first switching transistor Ts1 and the second switching transistor Ts2 are configured to control the on / off state of the current path between the first power supply terminal OVSS and the second power supply terminal OVDD according to the light emission control signal EM.

[0039] In some embodiments, the pixel circuit further includes an initialization unit 107, which includes an initialization transistor Tr. The control terminal of the initialization transistor Tr is configured to receive a first scan signal Scan1. The first source-drain terminal of the initialization transistor Tr is electrically connected to an initialization signal line, and the second source-drain terminal of the initialization transistor Tr is electrically connected to a first node No1. The initialization transistor Tr is configured to control the on / off state of the current path between the first node No1 and the initialization signal line according to the first scan signal Scan1.

[0040] In some embodiments, the pixel circuit may further include a first capacitor C1, which is electrically connected between the anode of the light-emitting device Le and the first power supply terminal OVSS.

[0041] It should be noted that the aforementioned control terminal can be the gate of a transistor, the first source-drain terminal can be one of the source and drain terminals of the transistor, and the second source-drain terminal can be the other of the source and drain terminals of the transistor. The active layer of each transistor can include silicon semiconductor material or oxide semiconductor material. The silicon semiconductor material includes monocrystalline silicon, polycrystalline silicon, or amorphous silicon, etc. The oxide semiconductor material includes indium gallium zinc oxide or indium zinc oxide, etc. The aforementioned transistors can be implemented as bipolar junction transistors, field-effect transistors, or thin-film transistors, respectively. The aforementioned transistors can be P-type transistors or N-type transistors, respectively. In some embodiments, Figure 4 The first capacitor C1 shown can be considered as a parasitic capacitor.

[0042] It should be understood that, Figure 4 The pixel circuit shown is for illustrative purposes only and is not intended to limit the pixel circuit of this application to only using... Figure 4 The design of the pixel circuit is as follows. Those skilled in the art can modify the device type, number of devices, device connection relationships, and device implementation of each unit according to actual needs. They can also modify the connection relationships between the data writing unit 103 and the driving unit 101, and between the potential maintenance unit 108 and the driving unit 101. The compensation unit 104 and the switching unit can be selectively configured. Furthermore, other units can be selectively added to the pixel circuit.

[0043] Please continue reading. Figures 4-5 Taking the pixel circuit as an example where each transistor is a P-type transistor and the reset signal line VL is multiplexed as the initialization signal line, the working principle of the pixel circuit will be explained.

[0044] In the first stage t1: the first scan signal Scan1 is low, the second scan signal Scan2 and the light emission control signal EM are high, the reset transistor Ti and the initialization transistor Tr are turned on, and the reset signal VI resets the potential of the first node No1 and the potential of the anode of the light emission device Le, so that the voltage of the first node No1 and the anode voltage are the voltage of the reset signal VI.

[0045] In the second stage t2: the second scan signal Scan2 is low, the first scan signal Scan1 and the light emission control signal EM are high, the data transistor Tda and the compensation transistor Tc are turned on, so that the data signal and the threshold voltage information of the driving transistor Tdr are transmitted to the first node No1, so that the potential of the first node No1 is the difference between the data signal and the threshold voltage.

[0046] In the third stage (t3), the light-emitting control signal EM is low, while the first scan signal Scan1 and the second scan signal Scan2 are high. The first switching transistor Ts1, the second switching transistor Ts2, and the driving transistor Tdr are turned on, causing the potential of the second node No2 to change from the voltage of the data signal to the voltage of the second power supply signal supplied by the second power supply terminal OVDD. The voltage difference VA between the second node No2 and the first node No1 is the sum of the second power supply signal voltage Vdd minus the data signal voltage Vdata and the threshold voltage Vth of the driving transistor Tdr, i.e., VA = Vdd - Vdata + Vth. The driving transistor Tdr generates a driving current. The flow path formed between the first power supply terminal OVSS and the second power supply terminal OVDD allows the driving current to charge the anode of the light-emitting device Le. When the anode potential changes from the voltage Vi corresponding to the reset signal VI to the lighting voltage Vo, the light-emitting device Le begins to emit light.

[0047] Therefore, the third stage t3 can correspond to both the charging stage t31 and the light-emitting stage t32. For example... Figures 6A-6B This is a schematic diagram illustrating the changes in anode voltage and the light-emitting state of the light-emitting device during the charging and light-emitting periods, as provided in an embodiment of this application. Figure 6A In this context, VB represents the potential corresponding to the change in anode potential from the voltage Vi corresponding to the reset signal VI to the lighting voltage Vo. Figure 6B In this context, V_ano represents the change in anode potential. Figure 6B In this context, Le_s represents the change in the luminous state of the light-emitting device Le.

[0048] During the charging phase t31, the driving current charges the anode of the light-emitting device Le, causing the anode potential of Le to rise until the voltage Vi corresponding to the anode potential self-reset signal VI rises to the lighting voltage Vo, at which point the light-emitting device Le emits light. During the transition of the light-emitting device Le from a non-emitting state to an emitting state, the rate of potential change of the light-emitting device Le is directly proportional to the amount of driving current driving the light-emitting device Le to emit light. Therefore, the larger the driving current, the faster the voltage corresponding to the anode potential self-reset signal VI rises to the lighting voltage Vo, and the faster the light-emitting device Le emits light.

[0049] Because the driving current corresponding to the high grayscale sub-pixel (referred to as the first sub-pixel) is different from the driving current corresponding to the low grayscale sub-pixel (referred to as the second sub-pixel), the anode potential change of the first sub-pixel's light-emitting device Le will be different from that of the second sub-pixel's light-emitting device Le during the process of the light-emitting device Le switching from a non-light-emitting state to a light-emitting state. This results in a difference between the light-emitting duration of the first sub-pixel's light-emitting device Le and the light-emitting duration of the second sub-pixel's light-emitting device Le.

[0050] like Figure 7 This is a schematic diagram illustrating the changes in the light-emitting state of light-emitting devices corresponding to different gray levels, provided in an embodiment of this application. The driving current corresponding to the sub-pixel displaying a higher gray level is greater than the driving current corresponding to the sub-pixel displaying a lower gray level. This causes the anode potential of the light-emitting device Le to change from a non-light-emitting state to a light-emitting state before the anode potential of the light-emitting device Le of the first sub-pixel changes to the starting voltage Vo corresponding to the reset signal VI, thus making the light-emitting duration of the light-emitting device Le of the first sub-pixel greater than that of the light-emitting device Le of the second sub-pixel.

[0051] The brightness of the sub-pixel Spx is influenced by both the driving current of the light-emitting device Le and the emission duration of Le. Furthermore, to represent different grayscale levels, the driving current of the first sub-pixel must differ from that of the second sub-pixel. Therefore, the brightness of the light-emitting device Le can be adjusted by regulating its emission duration.

[0052] In some embodiments, the duration of light emission can be adjusted by changing the duty cycle of the light emission control signal EM. However, adjusting the duty cycle of the light emission control signal EM increases the complexity of light emission control, which is detrimental to improving brightness adjustment efficiency. Furthermore, since the driving current also affects display brightness, and the driving current corresponding to high grayscale sub-pixels differs from that corresponding to low grayscale sub-pixels, when adjusting the duty cycle of the light emission control signal EM to adjust the duration of light emission, the adjustment of the duty cycle of the light emission control signal EM corresponding to high grayscale sub-pixels cannot be completely synchronized with the adjustment of the duty cycle of the light emission control signal EM corresponding to low grayscale sub-pixels. This results in high brightness adjustment complexity and is detrimental to improving brightness adjustment efficiency. Therefore, to simplify the brightness adjustment method and improve brightness adjustment efficiency, the brightness of the light emission device Le can be adjusted by adjusting the duration of the charging phase t31 of the light emission device Le. That is, the duration of light emission of the light emission device Le can be adjusted by adjusting the voltage corresponding to the start time of the charging phase t31 of the light emission device Le. As shown in Figure 7, the duration of light emission of the light-emitting device Le can be adjusted by adjusting the voltage of the reset signal VI to change the voltage Vi corresponding to the anode self-reset signal VI to the lighting voltage Vo.

[0053] Accordingly, please continue reading Figure 3 The adjustment control module 20 is electrically connected to multiple sub-pixels Spx. The adjustment control module 20 is configured to adjust the voltage of the reset signal VI according to the working state of the display panel 10, so as to adjust the light emission duration of each light-emitting device Le in the current frame, thereby realizing the adjustment of the display brightness of the display panel 10.

[0054] Furthermore, even though sub-pixels displaying high grayscale and those displaying low grayscale share the same reset signal VI, the human eye is more sensitive to changes in low grayscale brightness. Therefore, the brightness change of sub-pixels displaying low grayscale will be more pronounced than that of sub-pixels displaying high grayscale due to the voltage adjustment of the reset signal VI. This results in a significant adjustment to the display brightness of the low grayscale sub-pixels, thereby improving low grayscale brightness deviation. Sharing the same reset signal VI with sub-pixels displaying high and low grayscale eliminates the need for separate adjustments to the brightness adjustment methods for each sub-pixel, reducing brightness adjustment complexity and improving both low grayscale brightness and adjustment efficiency.

[0055] Furthermore, adjusting the display brightness allows for adjustment of the mapping relationship between the input signal received by the gamma circuit and the brightness exhibited by the display panel 10. Therefore, by adjusting the display brightness through adjusting the light emission duration, the gamma curve characterizing grayscale and brightness is also adjusted.

[0056] It should be noted that, except Figure 4 and Figure 5 In addition to the design shown, the reset signal VI can also be implemented by multiplexing the signal used to reset the third node No3. That is, in some embodiments, the reset unit 102 is electrically connected to the anode of the light-emitting device Le through the third node No3. In any one or more stages before the third stage t3, the reset signal VI is transmitted to the anode of the light-emitting device Le via the reset transistor Ti or via the reset transistor Ti and the second switching transistor Ts2 to reset the anode potential of the light-emitting device Le. In other words, the reset signal VI of this application can be transmitted to the anode in any one or more stages before the third stage t3 to achieve the reset of the anode potential. The reset signal VI can be transmitted to the anode of the light-emitting device Le via the reset unit 102, or via the reset unit 102 or other units in the pixel circuit.

[0057] It should be noted that the boundary between low and high grayscale in this application may vary depending on the actual display requirements. In some embodiments, low grayscale corresponds to grayscale values ​​less than or equal to m, and high grayscale corresponds to grayscale values ​​greater than m. Here, m can be 64.

[0058] The operating state of the display panel 10 can be considered a state requiring brightness adjustment. For example, when the display panel 10 displays at a variable refresh rate, the brightness of the display panel 10 varies with the refresh rate, causing flickering. Therefore, brightness adjustment is necessary to improve the flickering problem. Furthermore, as the cumulative operating time of the display panel 10 increases, the characteristics of the light-emitting device Le will deteriorate, thus requiring brightness adjustment. Additionally, the characteristics of transistors differ under different temperature conditions, resulting in differences in the driving current generated by the driving transistor Tdr for the same brightness, also requiring brightness adjustment.

[0059] Therefore, the adjustment control module 20 can be configured to adjust the voltage of the reset signal VI according to at least one of the refresh rate of the display panel 10, the cumulative operating time of the display panel 10, and the ambient temperature of the display panel 10, so as to adjust the light emission duration of each light-emitting device Le in the current frame, thereby adjusting the display brightness of the display panel 10. By adjusting the voltage of the reset signal VI to adjust the display brightness, it is no longer necessary to use a large number of gamma curves to adjust the gamma circuit, which helps to simplify the complexity of brightness adjustment and improve the brightness adjustment efficiency. Moreover, adjusting the light emission duration of the light-emitting device Le can significantly adjust the brightness of sub-pixels displaying low grayscale content, thereby improving low grayscale brightness deviation.

[0060] Optionally, the adjustment control module 20 is configured to increase the light-emitting duration of the light-emitting device Le when the voltage of the reset signal VI is increased according to at least one of the refresh frequency, cumulative operating time, and ambient temperature, thereby increasing the light-emitting brightness of the light-emitting device Le. Conversely, the adjustment control module 20 is configured to decrease the light-emitting duration of the light-emitting device Le when the voltage of the reset signal VI is decreased according to at least one of the refresh frequency, cumulative operating time, and ambient temperature, thereby decreasing the light-emitting brightness of the light-emitting device Le.

[0061] Figures 8A-8B This is a schematic diagram showing the changes in the luminous state of light-emitting devices corresponding to different gray levels at different refresh frequencies, as provided in the embodiments of this application. Figures 9A-9B This is a schematic diagram illustrating the relationship between frequency and brightness ratio provided in an embodiment of this application. Figures 8A-8B In this context, Dat_w represents the data signal; Le_sh represents the change in the light-emitting state of the light-emitting device in the sub-pixel corresponding to the display of high grayscale; and Le_sl represents the change in the light-emitting state of the light-emitting device in the sub-pixel corresponding to the display of low grayscale.

[0062] In some embodiments, the display panel 10 displays at a variable refresh rate. However, when the display panel 10 displays at a high refresh rate, the light-emitting device Le emits light for a shorter duration. Conversely, when the display panel 10 displays at a low refresh rate, the light-emitting device Le emits light for a longer duration. Therefore, the sub-pixel Spx exhibits different low grayscale brightness at different refresh rates, causing flickering issues in the display panel 10. Figure 8A and Figure 9A As shown. Therefore, to reduce the brightness difference caused by frequency changes, the voltage of the reset signal VI can be adjusted synchronously with the refresh frequency of the display panel 10, so as to change the duration of the light-emitting device Le with the refresh frequency, thereby adjusting the brightness of the light-emitting device Le, as shown. Figure 8B and Figure 9B As shown.

[0063] Optionally, the adjustment control module 20 is configured to increase the voltage of the reset signal VI when the refresh frequency increases, thereby reducing the charging voltage difference corresponding to the transition of the light-emitting device Le from a non-emitting state to an emitting state. This accelerates the charging speed of the anode potential of the light-emitting device Le from the voltage corresponding to the reset signal VI to the lighting voltage Vo, increasing the duration of the light-emitting device Le. Conversely, when the refresh frequency decreases, the adjustment control module 20 is configured to decrease the voltage of the reset signal VI, thereby increasing the charging voltage difference corresponding to the transition of the light-emitting device Le from a non-emitting state to an emitting state. This slows down the charging speed of the anode potential of the light-emitting device Le from the voltage corresponding to the reset signal VI to the lighting voltage Vo, reducing the duration of the light-emitting device Le. This can improve the brightness difference of the light-emitting device Le at different refresh frequencies, thus improving flickering and other problems. Furthermore, the brightness deviation of the low grayscale sub-pixels at different refresh frequencies can also be improved by adjusting the emitting duration.

[0064] Since the light emission duration of the light-emitting device Le is different for different refresh frequencies, in order to further improve flickering and other problems, the light emission duration of the light-emitting device Le for different frames at the same refresh frequency can be controlled, and / or the ratio of the light emission duration of the light-emitting device Le for different refresh frequencies can be controlled.

[0065] In some embodiments, the adjustment control module 20 is configured to control the proportion of the light emission duration of the sub-pixel Spx in each frame to be the same at the same refresh rate of the display panel 10, so that the light emission brightness of the sub-pixel Spx tends to be consistent in each frame, thereby improving the flicker problem.

[0066] In some embodiments, the driving unit 101 of each sub-pixel Spx includes a driving transistor Tdr, which is configured to generate a driving current according to the corresponding data signal. The time from when the gate of the driving transistor Tdr in each sub-pixel Spx begins to receive the corresponding data signal to when the light-emitting device Le begins to emit light is a first time period. Here, f1 / f2=N, t2 / t1=N; f1 represents the first refresh frequency, f2 represents the second refresh frequency, t1 represents the duration of the first time period corresponding to the sub-pixel Spx when the refresh frequency of the display panel 10 is the first refresh frequency, t2 represents the duration of the first time period corresponding to the sub-pixel Spx when the refresh frequency of the display panel 10 is the second refresh frequency, and N≥2. By making the ratio of the first time period corresponding to the second refresh frequency to the first time period corresponding to the first refresh frequency equal to the ratio of the first refresh frequency to the second refresh frequency, the brightness ratios corresponding to different frequencies tend to be consistent, thereby improving the flicker problem.

[0067] Please continue reading. Figure 8B and Figure 9BTaking the refresh rates of display panel 10 as 60Hz, 120Hz, and 240Hz as examples, when the refresh rate of display panel 10 is 60Hz, the duration of the first time segment corresponding to the display of high grayscale subpixels in each frame is 'a', and the duration of the first time segment corresponding to the display of low grayscale subpixels in each frame is 'b', thus ensuring that the proportion of the emission duration of subpixel Spx in each frame is the same. Where a > 0 and b > 0.

[0068] When the refresh rate of the display panel 10 is 120Hz, the duration of the first time segment corresponding to the high grayscale subpixel in each frame is a / 2, and the duration of the first time segment corresponding to the low grayscale subpixel in each frame is b / 2, thus ensuring that the proportion of the light-emitting duration of the subpixel Spx in each frame is the same. Furthermore, the ratio of the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 60Hz to the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 120Hz is equal to the ratio of 120Hz to 60Hz. This allows the proportion of the light-emitting duration to change proportionally with the frequency, which helps to improve flicker issues.

[0069] When the refresh rate of the display panel 10 is 240Hz, the duration of the first time segment corresponding to the high grayscale subpixel in each frame is a / 4, and the duration of the first time segment corresponding to the low grayscale subpixel in each frame is b / 4, thus ensuring that the proportion of the emission duration of the subpixel Spx in each frame is the same. Furthermore, the ratio of the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 60Hz to the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 240Hz is equal to the ratio of 240Hz to 60Hz, allowing the proportion of the emission duration to change proportionally with the frequency, which helps to improve flicker issues. Similarly, the ratio of the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 120Hz to the duration of the first time segment corresponding to the subpixel Spx when the refresh rate of the display panel 10 is 240Hz is equal to the ratio of 240Hz to 120Hz, allowing the proportion of the emission duration to change proportionally with the frequency, which also helps to improve flicker issues.

[0070] In some embodiments, to adjust the voltage of the reset signal VI according to the refresh frequency of the display panel 10, the adjustment control module 20 may include a timing control unit 201 and a power management unit 202, such as... Figure 3As shown. The timing control unit 201 is electrically connected to the display panel 10, and is configured to generate a first adjustment signal when the refresh rate of the display panel 10 changes. The power management unit 202 is electrically connected to the timing control unit 201, and is configured to adjust the voltage of the reset signal VI according to the first adjustment signal.

[0071] Optionally, the timing control unit 201 can be a timing controller, and the power management unit 202 can be a power management chip.

[0072] In some embodiments, the timing control unit 201 is configured to determine the refresh frequency of the display panel 10 based on the vertical synchronization control signal, thereby reducing the difficulty of determining the refresh frequency of the display panel 10. For example, the timing control unit 201 is configured to determine the refresh frequency of the display panel 10 based on the frequency of the vertical synchronization control signal. When the frequency of the vertical synchronization control signal changes, the refresh frequency of the display panel 10 changes accordingly. A larger frequency in the vertical synchronization control signal corresponds to a larger refresh frequency in the display panel 10, and a smaller frequency in the vertical synchronization control signal corresponds to a smaller refresh frequency in the display panel 10.

[0073] In some embodiments, the voltage of the first power supply signal is adjusted due to factors such as changes in the voltage difference between the drain and source of the driving transistor Tdr and the degradation of the characteristics of the light-emitting device Le. For example... Figures 10A-10BThis is a schematic diagram illustrating the voltage change of the first power supply signal provided in an embodiment of this application. In Figure 10B, Y=a1x+b1 and Y=a2x+b2 represent the mapping relationship between the driving current Id and the voltage difference Vds between the drain and source of the driving transistor Tdr. When the driving transistor Tdr operates in the linear region, the driving current Id changes significantly with the voltage difference Vds between its drain and source, and correspondingly, the brightness of the light-emitting device Le also changes significantly. However, when the driving transistor Tdr operates in the saturation region, the influence of the voltage difference Vds on the driving current Id decreases. When the mapping relationship between the driving current Id and the voltage difference Vds is different, the corresponding gamma curves reflecting the relationship between grayscale and brightness will also be different. When the voltage difference Vds between the drain and source of the driving transistor Tdr increases due to the tunneling effect, the brightness increases. The brightness of sub-pixels displaying lower grayscale levels changes rapidly, causing the relationship between grayscale and brightness to no longer conform to the gamma curve design. Furthermore, the degradation of the characteristics of the light-emitting device Le increases the driving voltage difference Vol between the anode and cathode of Le, leading to an increase in the brightness of sub-pixels displaying lower grayscale levels. Therefore, to improve the display brightness deviation and reduce power consumption, the voltage Vss of the first power supply signal and the voltage Vi of the reset signal VI can be adjusted to mitigate the influence of changes in the voltage difference Vds between the drain and source of the driving transistor Tdr on brightness, as well as the impact of factors such as the degradation of the characteristics of the light-emitting device Le on brightness.

[0074] Figure 11 This diagram illustrates the relationship between the voltage of the first power signal and the voltage of the second power signal and time, as provided in an embodiment of this application. Figure 11In the diagram, Vi_r represents the voltage change of the reset signal VI when the decrease in voltage of the reset signal VI with increasing cumulative operating time is equal to the decrease in voltage of the first power supply signal Vss with increasing cumulative operating time. In some embodiments, the cathode of the light-emitting device Le of each sub-pixel Spx is electrically connected to the first power supply terminal OVSS. The adjustment control module 20 is configured to control the voltage of the first power signal supplied by the first power terminal OVSS to decrease as the cumulative working time increases when the cumulative working time of the display panel 10 exceeds a preset threshold, and to control the voltage Vi of the reset signal VI to decrease as the cumulative working time increases. The amount of decrease in the voltage Vi of the reset signal VI as the cumulative working time increases is greater than the amount of decrease in the voltage Vss of the first power signal as the cumulative working time increases. This is to reduce power consumption while using the change in the voltage Vi of the reset signal VI to improve the effect of the increase in the driving voltage difference Vol between the anode and cathode and the change in the voltage difference Vds between the drain and source of the driving transistor Tdr on the driving current, thereby reducing the increase in brightness of the sub-pixels with low grayscale and improving the low grayscale brightness deviation.

[0075] Optionally, to control the voltage of the first power supply signal and the voltage of the reset signal VI, the adjustment control module 20 includes a storage unit 203, a timing control unit 201, and a power management unit 202, such as... Figure 3 As shown. Storage unit 203 is configured to store information about the cumulative operating time of display panel 10. Timing control unit 201 is electrically connected to display panel 10 and storage unit 203. Timing control unit 201 is configured to read the information about the cumulative operating time stored in storage unit 203 when display panel 10 is powered on, and to generate a second adjustment signal and a third adjustment signal when the cumulative operating time exceeds a preset threshold. Power management unit 202 is electrically connected to timing control unit 201. Power management unit 202 is configured to adjust the voltage Vi of reset signal VI according to the second adjustment signal, and to adjust the voltage Vss of first power signal according to the third adjustment signal.

[0076] It should be noted that the storage unit 203 can be a non-volatile memory, the timing control unit 201 can be a timing controller, and the power management unit 202 can be a power management chip. The cumulative operating time refers to the duration of use of the display panel 10 from its factory manufacturing time to the current time. The preset threshold can be set differently depending on actual usage requirements. For example, in some embodiments, the preset threshold can be set to equal to h hours, where h ≥ 0.

[0077] In some embodiments, the characteristics of devices such as the driving transistor Tdr may vary due to temperature, resulting in differences in driving current and consequently, differences in brightness. Therefore, the voltage of the reset signal VI can be adjusted according to the driving current under different ambient temperatures. Accordingly, the adjustment control module 20 is configured to adjust the voltage of the reset signal VI based on the ambient temperature of the environment where the display panel 10 is located and the driving current driving the light-emitting device Le to emit light, so as to adjust the brightness of the light-emitting device Le according to the characteristics of the device and reduce the display brightness differences caused by differences in device characteristics.

[0078] Optionally, when the ambient temperature of the display panel 10 changes, if the driving current decreases in response to the temperature change, the voltage of the reset signal VI is increased to increase the light-emitting duration of the light-emitting device Le. Conversely, if the driving current increases in response to the temperature change, the voltage of the reset signal VI is decreased to shorten the light-emitting duration of the light-emitting device Le.

[0079] Optionally, to adjust the voltage of the reset signal VI based on the ambient temperature of the display panel 10, the adjustment control module 20 may include a temperature detection unit 204, a timing control unit 201, and a power management unit 202, such as... Figure 3 As shown. The temperature detection unit 204 is configured to detect the ambient temperature of the environment in which the display panel 10 is located. The timing control unit 201 is electrically connected to the display panel 10 and the temperature detection unit 204. The timing control unit 201 is configured to generate a fourth adjustment signal based on the ambient temperature detected by the temperature detection unit 204 and the driving current driving the light-emitting device Le to emit light. The power management unit 202 is electrically connected to the timing control unit 201. The power management unit 202 is configured to adjust the voltage of the reset signal VI according to the fourth adjustment signal.

[0080] The temperature detection unit 204 may include devices such as a temperature sensor, the timing control unit 201 may be a timing controller, and the power management unit 202 may be a power management chip.

[0081] It should be noted that when adjusting the voltage of the reset signal VI based on the refresh frequency, cumulative working time, and ambient temperature, the weight ratios of the first, second, and fourth adjustment signals can be adjusted according to the weight of the refresh frequency, cumulative working time, and ambient temperature on the brightness, so as to comprehensively adjust the voltage of the reset signal VI by considering the effects of the refresh frequency, cumulative working time, and ambient temperature.

[0082] This application also provides a display control method for controlling any of the above-mentioned display panels 10 to display.

[0083] like Figures 12A-12CThis is a flowchart of a display control method provided in an embodiment of this application. The display control method may include: adjusting the voltage of a reset signal VI according to at least one of the refresh rate of the display panel 10, the cumulative operating time of the display panel 10, and the ambient temperature of the display panel 10, to adjust the light-emitting duration of the light-emitting device Le. By adjusting the light-emitting duration of the light-emitting device Le to adjust its brightness, it is no longer necessary to use a large number of gamma curves to adjust the gamma circuit, which simplifies the complexity of brightness adjustment and improves the efficiency of brightness adjustment. Moreover, adjusting the light-emitting duration of the light-emitting device Le can significantly adjust the brightness of sub-pixels Spx displaying low grayscale content, thereby improving low grayscale brightness deviation.

[0084] In some embodiments, the step of adjusting the voltage of the reset signal VI to adjust the light-emitting duration of the light-emitting device Le according to at least one of the refresh frequency of the display panel 10, the cumulative operating time of the display panel 10, and the ambient temperature of the display panel 10 includes: Determine if the refresh rate of display panel 10 has changed; When it is determined that the refresh rate of the display panel 10 has not changed, the voltage of the reset signal VI is not adjusted.

[0085] When it is determined that the refresh rate of the display panel 10 has changed, it is determined whether the refresh rate of the display panel 10 has increased.

[0086] When the refresh rate of the display panel 10 is increased, the voltage of the reset signal VI is increased to increase the light emission duration of the light-emitting device Le; When it is determined that the refresh rate of the display panel 10 has decreased, the voltage of the reset signal VI is reduced to reduce the light-emitting duration of the light-emitting device Le. Figure 12B As shown.

[0087] Optionally, the timing control unit 201 can determine whether the refresh frequency of the display panel 10 has changed, and the voltage of the reset signal VI can be adjusted by the voltage management unit. In some embodiments, the timing control unit 201 can determine whether the refresh frequency of the display panel 10 has changed based on the frequency of the vertical synchronization control signal. Accordingly, the step of determining whether the refresh frequency of the display panel 10 has changed may include: determining whether the frequency of the vertical synchronization control signal has changed; when it is determined that the frequency of the vertical synchronization control signal has not changed, determining that the refresh frequency of the display panel 10 has not changed; when it is determined that the frequency of the vertical synchronization control signal has changed, determining that the refresh frequency of the display panel 10 has changed, and determining whether the frequency of the vertical synchronization control signal has increased; when it is determined that the frequency of the vertical synchronization control signal has increased, determining that the refresh frequency of the display panel 10 has increased; when it is determined that the frequency of the vertical synchronization control signal has decreased, determining that the refresh frequency of the display panel 10 has decreased.

[0088] Optionally, when the timing control unit 201 determines that the refresh frequency of the display panel 10 has changed, it generates a first adjustment signal, and the power management unit 202 adjusts the voltage of the reset signal VI according to the first adjustment signal.

[0089] In some embodiments, the power management unit 202 can increase or decrease the voltage of the reset signal VI by adjusting the level of the first adjustment signal. Correspondingly, the step of increasing the voltage of the reset signal VI to increase the light-emitting duration of the light-emitting device Le when it is determined that the refresh frequency of the display panel 10 has increased may include: generating a first level of the first adjustment signal when it is determined that the refresh frequency of the display panel 10 has increased; and increasing the voltage of the reset signal VI according to the first adjustment signal. The step of decreasing the voltage of the reset signal VI to decrease the light-emitting duration of the light-emitting device Le when it is determined that the refresh frequency of the display panel 10 has decreased may include: generating a second level of the first adjustment signal when it is determined that the refresh frequency of the display panel 10 has decreased; and decreasing the voltage of the reset signal VI according to the first adjustment signal. Wherein, the first level is one of a low level and a high level, and the second level is the other of a low level and a high level.

[0090] In some embodiments, the first adjustment signal may include a first sub-adjustment signal and a second sub-adjustment signal. The power management unit 202 may increase the voltage of the reset signal VI through the first sub-adjustment signal, and the power management unit 202 may increase the voltage of the reset signal VI through the second sub-adjustment signal. Accordingly, the step of increasing the voltage of the reset signal VI to increase the light emission duration of the light-emitting device Le when it is determined that the refresh frequency of the display panel 10 has increased may include: generating a first sub-adjustment signal when it is determined that the refresh frequency of the display panel 10 has increased; and increasing the voltage of the reset signal VI according to the first sub-adjustment signal. The step of decreasing the voltage of the reset signal VI to decrease the light emission duration of the light-emitting device Le when it is determined that the refresh frequency of the display panel 10 has decreased may include: generating a second sub-adjustment signal when it is determined that the refresh frequency of the display panel 10 has decreased; and decreasing the voltage of the reset signal VI according to the second sub-adjustment signal.

[0091] Optionally, the display control method further includes: controlling the proportion of the emission duration of the sub-pixel Spx in each frame to be the same at the same refresh rate. This allows the brightness of the sub-pixel Spx to be more consistent across different frames at the same refresh rate.

[0092] It should be understood that the voltage of the reset signal VI can be adjusted by the timing control unit 201 and the power management unit 202 to adjust the duration of light emission, thereby adjusting the proportion of the duration of light emission of the sub-pixel Spx in each frame.

[0093] Optionally, the display control method further includes: controlling the ratio of the duration of the first time period corresponding to the sub-pixel Spx at the second refresh frequency to the duration of the first time period corresponding to the sub-pixel Spx at the first refresh frequency to be equal to the ratio of the first refresh frequency to the second refresh frequency. This can improve the display brightness difference problem when the display panel 10 displays at different refresh frequencies, and is beneficial for reducing flicker.

[0094] It should be understood that the voltage of the reset signal VI can be adjusted by the timing control unit 201 and the power management unit 202 to adjust the duration of light emission, thereby adjusting the duration of the first time period corresponding to different refresh frequencies.

[0095] In some embodiments, the step of adjusting the voltage of the reset signal VI to adjust the light-emitting duration of the light-emitting device Le according to at least one of the refresh frequency of the display panel 10, the cumulative operating time of the display panel 10, and the ambient temperature of the display panel 10 includes: Determine whether the cumulative working time of the display panel 10 is greater than or equal to a preset threshold; When the cumulative operating time of the display panel 10 is determined to be greater than or equal to a preset threshold, the voltage of the first power signal supplied by the first power terminal OVSS is controlled to decrease as the cumulative operating time increases, and the voltage of the reset signal VI is controlled to decrease as the cumulative operating time increases. Furthermore, the amount of decrease in the voltage of the reset signal VI as the cumulative operating time increases is greater than the amount of decrease in the voltage of the first power signal as the cumulative operating time increases. Figure 12C As shown.

[0096] By adjusting the voltage of the first power signal and the voltage of the reset signal VI according to the cumulative working time of the display panel 10, the power consumption can be reduced, while the impact of the voltage difference between the drain and source of the driving transistor Tdr and the degradation of the light-emitting device Le on the brightness can be reduced. It can also reduce the increase in low grayscale brightness, which is beneficial to improving the low grayscale brightness deviation.

[0097] Optionally, before determining whether the cumulative operating time of the display panel 10 exceeds a preset threshold, the display control method may include: reading the cumulative operating time of the display panel 10 when it is powered on. The information regarding the cumulative operating time of the display panel 10 may be stored in the storage unit 203. The information regarding the cumulative operating time of the display panel 10 may be read by the timing control unit 201.

[0098] Optionally, the timing control unit 201 can determine whether the cumulative operating time of the display panel 10 is greater than a preset threshold, and generate a second adjustment signal and a third adjustment signal when the cumulative operating time of the display panel 10 is determined to be greater than the preset threshold. The power management unit 202 can adjust the voltage of the reset signal VI according to the second adjustment signal and adjust the voltage of the first power signal according to the third adjustment signal. For example, when the cumulative operating time of the display panel 10 is determined to be greater than the preset threshold, the second adjustment signal and the third adjustment signal are generated; the voltage of the reset signal VI is controlled to decrease as the cumulative operating time increases according to the second adjustment signal, and the voltage of the first power signal supplied by the first power terminal OVSS is controlled to decrease as the cumulative operating time increases according to the third adjustment signal. Among them, the amount of decrease in the voltage of the reset signal VI as the cumulative operating time increases is greater than the amount of decrease in the voltage of the first power signal as the cumulative operating time increases.

[0099] It should be understood that when the cumulative working time of the display panel 10 is determined to be less than a preset threshold, the voltage of the first power signal is kept constant, and the voltage of the reset signal VI is kept constant.

[0100] In some embodiments, the step of adjusting the voltage of the reset signal VI according to at least one of the refresh rate of the display panel 10, the cumulative operating time of the display panel 10, and the ambient temperature of the display panel 10, to adjust the light emission duration of the light-emitting device Le, includes: adjusting the voltage of the reset signal VI according to the ambient temperature of the environment where the display panel 10 is located and the driving current driving the light-emitting device Le to emit light. By adjusting the voltage of the reset signal VI according to the ambient temperature of the environment where the display panel 10 is located and the driving current, the brightness difference caused by the difference in device characteristics can be improved.

[0101] Optionally, the ambient temperature of the environment where the display panel 10 is located can be detected by the temperature detection unit 204. The timing control unit 201 can generate a fourth adjustment signal based on the ambient temperature of the environment where the display panel 10 is located and the driving current driving the light-emitting device Le to emit light. The power management unit 202 then adjusts the voltage of the reset signal VI based on the fourth adjustment signal. The method of adjusting the voltage of the reset signal VI based on the ambient temperature of the environment where the display panel 10 is located and the driving current driving the light-emitting device Le to emit light can be referred to the above description and will not be repeated here.

[0102] It should be noted that the timing control unit 201 can generate the first adjustment signal to the fourth adjustment signal simultaneously or separately. When the timing control unit 201 generates the first adjustment signal to the fourth adjustment signal simultaneously, the influence weights of the first adjustment signal to the fourth adjustment signal on the voltage of the adjustment reset signal VI may be different. The influence weights of the first adjustment signal to the fourth adjustment signal on the voltage of the adjustment reset signal VI may be set differently depending on the actual application scenario and method of the display panel 10.

[0103] It should be noted that the adjustment control module 20 may also include a system-level processing chip, a source driver chip, a gate driver circuit, and other components not shown. The system-level processing chip may include at least one of a central processing unit, a graphics processor, etc., and can provide input signals to the timing control unit 201, which may correspond to graphics data signals. The timing control unit 201 is electrically connected to the source driver chip and the gate driver circuit to provide the control signals required to drive the display panel 10 for display. Both the source driver chip and the gate driver circuit are electrically connected to the display panel 10. The source driver chip is used to provide the required data signals to the display panel 10, and the gate driver circuit is used to provide the required scanning signals to the display panel 10.

[0104] It should be understood that display devices can be mobile phones, computers, virtual reality displays, augmented reality displays, and so on. Display devices can be used in fields such as education, entertainment, transportation, medical care, and national defense to achieve display functions.

[0105] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the inventive concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A display device, characterized in that, include: The display panel includes multiple sub-pixels, each sub-pixel including a light-emitting device, a driving unit, and a reset unit. The driving unit is configured to drive the light-emitting device to emit light, and the reset unit is configured to transmit a reset signal to the anode of the light-emitting device to reset the potential of the anode. An adjustment control module, electrically connected to a plurality of the sub-pixels, is configured to adjust the voltage of the reset signal according to at least one of the refresh frequency of the display panel, the cumulative operating time of the display panel, and the ambient temperature of the display panel, so as to adjust the light emission duration of each of the light-emitting devices in the current frame.

2. The display device according to claim 1, characterized in that, The adjustment control module is configured such that when the voltage of the reset signal is increased according to at least one of the refresh frequency, the cumulative working time, and the ambient temperature, the light emission duration of the light-emitting device increases; and when the adjustment control module is configured such that the voltage of the reset signal is decreased according to at least one of the refresh frequency, the cumulative working time, and the ambient temperature, the light emission duration of the light-emitting device decreases.

3. The display device according to claim 1, characterized in that, The adjustment and control module is configured as follows: When the refresh frequency increases, the voltage of the reset signal is increased; and when the refresh frequency decreases, the voltage of the reset signal is decreased.

4. The display device according to claim 3, characterized in that, The adjustment and control module includes: A timing control unit, electrically connected to the display panel, is configured to generate a first adjustment signal when the refresh frequency of the display panel changes; A power management unit, electrically connected to the timing control unit, is configured to adjust the voltage of the reset signal according to the first adjustment signal.

5. The display device according to claim 4, characterized in that, The timing control unit is configured to determine the refresh rate of the display panel based on the vertical synchronization control signal.

6. The display device according to claim 3, characterized in that, The adjustment control module is configured to control the proportion of the light emission duration of the sub-pixel to be the same in each frame at the same refresh rate of the display panel.

7. The display device according to claim 6, characterized in that, The driving unit of each sub-pixel includes a driving transistor, which is configured to generate a driving current according to a corresponding data signal; the time from when the gate of the driving transistor in each sub-pixel begins to receive the corresponding data signal to when the light-emitting device begins to emit light is a first time period; Where f1 / f2=N, t2 / t1=N; f1 represents the first refresh frequency, f2 represents the second refresh frequency, t1 represents the duration of the first time period corresponding to the sub-pixel when the refresh frequency of the display panel is the first refresh frequency, t2 represents the duration of the first time period corresponding to the sub-pixel when the refresh frequency of the display panel is the second refresh frequency, and N≥2.

8. The display device according to any one of claims 1 to 7, characterized in that, The cathode of the light-emitting device of each sub-pixel is electrically connected to the first power supply terminal; The adjustment and control module is configured as follows: When the cumulative working time of the display panel is greater than or equal to a preset threshold, the voltage of the first power signal supplied by the first power supply terminal decreases as the cumulative working time increases, and the voltage of the reset signal decreases as the cumulative working time increases; the amount of decrease in the voltage of the reset signal as the cumulative working time increases is greater than the amount of decrease in the voltage of the first power signal as the cumulative working time increases.

9. The display device according to claim 8, characterized in that, The adjustment and control module includes: The storage unit is configured to store information about the cumulative operating time of the display panel; The timing control unit is electrically connected to the display panel and the storage unit, and is configured to read the information of the cumulative working time stored in the storage unit when the display panel is powered on, and generate a second adjustment signal and a third adjustment signal when the cumulative working time is greater than the preset threshold. The power management unit, electrically connected to the timing control unit, is configured to adjust the voltage of the reset signal according to the second adjustment signal and adjust the voltage of the first power signal according to the third adjustment signal.

10. The display device according to any one of claims 1 to 7, characterized in that, The adjustment and control module is configured as follows: The voltage of the reset signal is adjusted according to the ambient temperature of the environment where the display panel is located and the driving current that drives the light-emitting device to emit light.

11. The display device according to claim 10, characterized in that, The adjustment and control module includes: A temperature detection unit is configured to detect the ambient temperature of the environment in which the display panel is located; The timing control unit, electrically connected to the display panel and the temperature detection unit, is configured to generate a fourth adjustment signal based on the ambient temperature detected by the temperature detection unit and the driving current that drives the light-emitting device to emit light. The power management unit, electrically connected to the timing control unit, is configured to adjust the voltage of the reset signal according to the fourth adjustment signal.

12. A display control method, characterized in that, This is used to control a display panel to display information. The display panel includes multiple sub-pixels. Each sub-pixel includes a light-emitting device, a driving unit, and a reset unit. The driving unit is configured to drive the light-emitting device to emit light, and the reset unit is configured to transmit a reset signal to the anode of the light-emitting device to reset the potential of the anode. The display control method includes: The voltage of the reset signal is adjusted according to at least one of the refresh rate of the display panel, the cumulative working time of the display panel, and the ambient temperature of the display panel, so as to adjust the light emission duration of the light-emitting device.

13. The display control method according to claim 12, characterized in that, The step of adjusting the voltage of the reset signal to adjust the light-emitting duration of the light-emitting device based on at least one of the refresh rate of the display panel, the cumulative working time of the display panel, and the ambient temperature of the display panel includes: Determine whether the refresh rate of the display panel has changed; When it is determined that the refresh rate of the display panel increases, the voltage of the reset signal is increased to increase the light emission duration of the light-emitting device; When it is determined that the refresh rate of the display panel has decreased, the voltage of the reset signal is reduced to reduce the light emission duration of the light-emitting device.

14. The display control method according to claim 12, characterized in that, The cathode of the light-emitting device of each sub-pixel is electrically connected to the first power supply terminal; The step of adjusting the voltage of the reset signal to adjust the light-emitting duration of the light-emitting device based on at least one of the refresh frequency of the display panel, the cumulative working time of the display panel, and the ambient temperature of the display panel includes: Determine whether the cumulative working time of the display panel is greater than or equal to a preset threshold; When it is determined that the cumulative working time of the display panel is greater than or equal to the preset threshold, the voltage of the first power signal supplied by the first power supply terminal is controlled to decrease as the cumulative working time increases, and the voltage of the reset signal is controlled to decrease as the cumulative working time increases, and the amount of decrease in the voltage of the reset signal as the cumulative working time increases is greater than the amount of decrease in the voltage of the first power signal as the cumulative working time increases.

15. The display control method according to claim 12, characterized in that, The step of adjusting the voltage of the reset signal to adjust the light-emitting duration of the light-emitting device based on at least one of the refresh rate of the display panel, the cumulative working time of the display panel, and the ambient temperature of the display panel includes: The voltage of the reset signal is adjusted according to the ambient temperature of the environment where the display panel is located and the driving current that drives the light-emitting device to emit light.

Images