Voltage control method and device for pixel circuit, storage medium, and display device

Abstract

A voltage control method and device for a pixel circuit (110), a storage medium, and a display device. The voltage control method for a pixel circuit (110) comprises: acquiring the current temperature of a display screen of a display device (S11); and according to a preset rule, determining a voltage value of the current second driving voltage (ELVSS) on the basis of the current temperature, wherein the preset rule is: when a first driving voltage (ELVDD) is kept unchanged, the higher the current temperature, the greater the absolute value of the voltage value of the second driving voltage (ELVSS) (S12).

Description

Voltage control method, device, storage medium and display device for pixel circuit

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 8, 2024, with application number 202410030139.4 and invention name “Voltage control method, device, storage medium and display device for pixel circuit”, the contents of which should be understood as incorporated into this application by reference. Technical Field

[0002] This article relates to but is not limited to the field of display technology, and in particular to a voltage control method, device, storage medium and display device for a pixel circuit. Background Art

[0003] Organic light-emitting diodes (OLEDs) are an emerging display technology. Compared to traditional liquid crystal displays (LCDs), displays made with OLEDs offer wider viewing angles, higher refresh rates, and thinner dimensions. Low-temperature polycrystalline silicon oxide (LTPO) is a new backplane technology primarily used in the manufacture of high-end mobile phones and OLED TVs. Its high refresh rate, low power consumption, and flexibility make it a key technology for flexible OLED screens.

[0004] Some current LTPO OLED models exhibit a bluish color cast when the screen temperature rises at low brightness and low grayscale. The actual visual effect is shown in Figure 1, and the CIE (International Commission on illumination, French: Commission Internationale de l'Eclairage, abbreviated in French as CIE (International Commission on Illumination)) value is relatively low (as shown in Table 2). Summary of the Invention

[0005] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0006] The present disclosure provides a voltage control method for a pixel circuit, the pixel circuit comprising a driving module and a light-emitting element; one end of the driving module is configured to receive a first driving voltage and drive the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by a display device; the other end of the driving module is electrically connected to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is configured to receive a second driving voltage; the voltage control method comprises:

[0007] Acquire the current temperature of the display screen of the display device;

[0008] According to a preset rule, the voltage value of the current second driving voltage is determined according to the current temperature; wherein, the preset rule is that when the first driving voltage is kept unchanged, the higher the current temperature, the greater the absolute value of the voltage value of the current second driving voltage.

[0009] In an exemplary embodiment, the pixel circuit further includes an initialization module, the initialization module being electrically connected to the other end of the driving module and the first electrode of the light-emitting element, respectively, and the initialization module being configured to reset the first electrode of the light-emitting element according to an initial voltage; and the voltage control method further includes:

[0010] The current voltage value of the initial voltage is determined according to the current voltage value of the second driving voltage and the preset difference.

[0011] In an exemplary embodiment, determining the current voltage value of the second driving voltage according to the current temperature includes:

[0012] The current voltage value of the second driving voltage is determined according to the corresponding relationship among the current temperature, the preset display screen temperature and the voltage value of the second driving voltage.

[0013] In an exemplary embodiment, determining the current voltage value of the initial voltage according to the current voltage value of the second driving voltage and the preset difference includes:

[0014] The sum of the current voltage value of the second driving voltage and the preset difference is used as the current voltage value of the initial voltage.

[0015] In an exemplary embodiment, determining the current voltage value of the second driving voltage according to the corresponding relationship between the current temperature, the preset display screen temperature, and the voltage value of the second driving voltage includes:

[0016] According to the current temperature, the voltage value of the second driving voltage corresponding to the current temperature is determined from the correspondence between the preset display screen temperature and the voltage value of the second driving voltage, and the corresponding voltage value of the second driving voltage is used as the current voltage value of the second driving voltage.

[0017] In an exemplary embodiment, the preset voltage difference is 0.3V.

[0018] The present disclosure also provides a voltage control device for a pixel circuit, comprising a memory and a processor.

[0019] The memory is used to store a program of a voltage control method for a pixel circuit;

[0020] The processor is used to read and execute the program for the voltage control method for the pixel circuit, and execute any one of the above-mentioned voltage control methods.

[0021] The present disclosure further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable the computer to execute any of the above-mentioned voltage control methods.

[0022] The present disclosure also provides a display device, comprising a display screen having a plurality of pixel units, each pixel unit comprising a pixel circuit; the pixel circuit comprising a driving module and a light-emitting element; one end of the driving module being configured to receive a first driving voltage and driving the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by the display device; the other end of the driving module being electrically connected to a first electrode of the light-emitting element; and a second electrode of the light-emitting element being configured to receive a second driving voltage;

[0023] It also includes a temperature sensor, the above-mentioned voltage control device and a power supply module;

[0024] The temperature sensor is configured to detect the current temperature of the display screen;

[0025] The power supply module is configured to provide the second driving voltage to the second electrodes of the light-emitting elements of the plurality of pixel units according to the current voltage value of the second driving voltage.

[0026] In an exemplary embodiment, at least one pixel circuit further includes an initialization module, the initialization module being electrically connected to the other end of the driving module of the pixel circuit and the first electrode of the light-emitting element, respectively, and the initialization module being configured to reset the first electrode of the light-emitting element according to an initial voltage; characterized in that,

[0027] The power supply module is further configured to provide an initial voltage to the initialization module according to a current initial voltage value.

[0028] Still other aspects will become apparent upon reading and understanding the accompanying drawings and detailed description.

[0029] Summary of the Figures

[0030] The accompanying drawings are intended to provide a further understanding of the technical solutions of the present disclosure and constitute part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solutions of the present disclosure and do not constitute a limitation of the technical solutions of the present disclosure. The shapes and sizes of one or more components in the accompanying drawings do not reflect the actual scale and are intended only to illustrate the contents of the present disclosure.

[0031] The accompanying drawings are used to provide an understanding of the technical solution of the present disclosure and constitute a part of the specification. Together with the embodiments of the present disclosure, they are used to explain the technical solution of the present disclosure and do not constitute a limitation to the technical solution of the present disclosure.

[0032] FIG1 is a schematic diagram showing a blue screen color cast caused by an increase in screen temperature in the related art;

[0033] FIG2 is a schematic diagram of a voltage control method according to at least one embodiment of the present disclosure;

[0034] FIG3 is a schematic diagram of a pixel circuit according to at least one embodiment of the present disclosure;

[0035] FIG4 is a schematic diagram of a pixel circuit according to at least one embodiment of the present disclosure;

[0036] FIG5 is a schematic diagram of a display device according to at least one embodiment of the present disclosure;

[0037] FIG. 6 is a schematic diagram showing an improved display effect shown in FIG. 1 .

[0038] Details

[0039] The inventors of the present disclosure studied the luminance L and CIE coordinates of a pixel with a brightness of 2 nits (nit is the luminous intensity per unit area) and 32 grayscales under normal temperature and heated conditions (as shown in Table 1, where CIE is represented by x and y). They also studied the CIE coordinates of light of different brightnesses at 55 degrees (as shown in Table 2). The inventors of the present disclosure found that as the temperature increased, the brightness and CIE values ​​of the pixels decreased to varying degrees, and that the higher the temperature, the greater the decrease in the brightness and CIE coordinates of pixels with lower grayscales.

[0040] Table 1 Display brightness and CIE coordinates of 2 nit and 32 grayscale pixels at different temperatures

[0041] Table 2 CIE coordinates of pixels with different brightness at 55℃

[0042] The inventors of the present disclosure have discovered that increasing the voltage difference of light-emitting elements can improve screen brightness. Therefore, they have attempted to reduce the cathode voltage (electro luminescence source supply voltage, ELVSS) of light-emitting elements such as light-emitting diodes to increase the voltage difference of light-emitting elements and thus improve screen display brightness.

[0043] Figure 2 is a schematic diagram of a voltage control method according to at least one embodiment of the present disclosure. As shown in Figure 2, the voltage control method is applied to a pixel circuit of a display device, wherein the pixel circuit includes a driving module and a light-emitting element; one end of the driving module is configured to receive a first driving voltage and drive the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by the display device; the other end of the driving module is electrically connected to a first electrode of the light-emitting element, and a second electrode of the light-emitting element is configured to receive a second driving voltage; the voltage control method includes the following steps S11 to S12:

[0044] S11, obtaining the current temperature of the display screen of the display device;

[0045] S12. Determine the current voltage value of the second driving voltage according to the current temperature according to a preset rule;

[0046] The preset rule is that when the first driving voltage is kept unchanged, the higher the current temperature is, the greater the absolute value of the current second driving voltage is.

[0047] The embodiment of the present disclosure determines the voltage value of the current second driving voltage according to the current temperature so that when the first driving voltage is kept unchanged, the higher the current temperature, the lower the voltage value of the current second driving voltage, which can increase the voltage difference between the anode (corresponding to the above-mentioned first pole) and the cathode (corresponding to the above-mentioned second pole) of the light-emitting element, thereby improving the display brightness.

[0048] For example, the light emitting element may be a light emitting diode, the light emitting diode may be an OLED, the first electrode of the light emitting element may be an anode of the OLED, and the second electrode of the light emitting element may be a cathode of the OLED.

[0049] Exemplarily, the first driving voltage is a positive driving voltage, and the second driving voltage is a negative driving voltage. The voltage value of the second driving voltage is generally a negative value.

[0050] Exemplarily, the second driving voltage may be a cathode voltage ELVSS of the light emitting diode.

[0051] For example, the pixel circuit can be as shown in FIG3 . In FIG3 , the pixel circuit 110 includes a driving module 112 and a light-emitting element OLED. Dm represents a data signal, Sn1 represents a light-emission control signal, and a first driving voltage is connected to one end of the driving module. The other end of the driving module is connected to the anode of the OLED, and the cathode of the OLED is connected to a second driving voltage. The driving module 112 includes a first transistor T1, a second transistor T2, and a first capacitor C1.

[0052] In an exemplary embodiment, the pixel circuit may also be a pixel circuit with other structures, which will not be described in detail here.

[0053] For example, the current temperature of the display screen may be sampled every 30 seconds.

[0054] In an exemplary embodiment, the pixel circuit further includes an initialization module, the initialization module being electrically connected to the other end of the driving module and the first electrode of the light-emitting element, respectively, and the initialization module being configured to reset the first electrode of the light-emitting element according to an initial voltage; and the voltage control method further includes:

[0055] The current voltage value of the initial voltage is determined according to the current voltage value of the second driving voltage and the preset difference.

[0056] For example, the pixel circuit can be a pixel circuit with a 7T1C structure, as shown in Figure 4, where 210 in Figure 4 is a driving module, the light-emitting element is an OLED, D represents a data signal line (used to transmit a data signal), and E represents a light-emitting signal line (used to transmit a light-emitting control signal). A first driving voltage is connected to one end of the driving module, the other end of the driving module is connected to the anode of the OLED, and the cathode of the OLED is connected to the second driving voltage.

[0057] The 7T1C pixel circuit includes seven transistors, one storage capacitor, and seven signal lines. The first and seventh transistors T1 and T7 are reset transistors; the second transistor T2 is a compensation transistor; the third transistor T3 is a drive transistor, whose potential difference between its control electrode and the first electrode determines the magnitude of the drive current flowing between the first power line ELVDD and the second power line ELVSS; the fourth transistor T4 is a data write transistor; the fifth and sixth transistors T5 and T6 are light-emission control transistors; and the storage capacitor C stores the potential of the gate electrode of the third transistor T3.

[0058] a first scanning signal line S1 , a second scanning signal line S2 , a light emitting signal line E, a data signal line D, an initial signal line INIT, a first power line ELVDD, and a second power line ELVSS.

[0059] In an exemplary embodiment, the operation process of the pixel circuit may include:

[0060] The first phase A1 is called the reset phase. The conduction signal of S2 turns on the first transistor T1, and the signal of the initial signal line INIT is provided to the second node N2 to initialize (reset) the storage capacitor C and clear the original charge in the storage capacitor.

[0061] In the second phase A2, also known as the data writing phase or the threshold compensation phase, the on-signal of S1 turns on the second transistor T2, the fourth transistor T4, and the seventh transistor T7. The conduction of the seventh transistor T7 causes the initial voltage of the initial signal line INIT to be supplied to the first electrode of the OLED, initializing (resetting) the first electrode of the OLED, clearing the pre-stored voltage within it, and completing initialization. During this phase, since the second end of the storage capacitor C is at a low level, the third transistor T3 is turned on. The data voltage output by the data signal line D is supplied to the second node N2 via the first node N1, the third transistor T3, the third node N3, and the second transistor T2. The voltage at the second end of the storage capacitor C (the second node N2) is Vd-|Vth|.

[0062] In the third stage A3, called the light-emitting stage, the conduction signal of the light-emitting signal line E turns on the fifth transistor T5 and the sixth transistor T6. The power supply voltage output by the first power line VDD provides a driving voltage to the first electrode of the OLED through the turned-on fifth transistor T5, the third transistor T3 and the sixth transistor T6, thereby driving the OLED to emit light.

[0063] During the pixel circuit driving process, the driving current flowing through the third transistor T3 (driving transistor) is determined by the voltage difference between its gate electrode and the first electrode.

[0064] In an exemplary embodiment, the pixel circuit may also be a pixel circuit with other structures, which will not be described in detail here.

[0065] In an exemplary embodiment, determining the current voltage value of the second driving voltage according to the current temperature includes:

[0066] The current voltage value of the second driving voltage is determined according to the corresponding relationship among the current temperature, the preset display screen temperature and the voltage value of the second driving voltage.

[0067] For example, the corresponding relationship between the current display screen temperature, the preset display screen temperature T and the second driving voltage ELVSS can be shown in Table 3. As can be seen from Table 3, the higher the display screen temperature, the greater the absolute value of the corresponding second driving voltage.

[0068] Table 3 Corresponding relationship between the preset display screen temperature T and the second driving voltage ELVSS

[0069] In an exemplary embodiment, determining the current voltage value of the initial voltage according to the current voltage value of the second driving voltage and the preset difference includes:

[0070] The sum of the current voltage value of the second driving voltage and the preset difference is used as the current voltage value of the initial voltage.

[0071] For example, the corresponding relationship between the preset display screen temperature T, the second driving voltage, and the ELVSS initial voltage INIT may be as shown in Table 4. In Table 4, NOR4 to NOR9 represent different BANDs (ie, display brightness value segments).

[0072] Table 4 Correspondence between the preset display screen temperature T and the second driving voltage and the ELVSS initial voltage INIT

[0073] In an exemplary embodiment, determining the current voltage value of the second driving voltage according to the corresponding relationship between the current temperature, the preset display screen temperature, and the voltage value of the second driving voltage includes:

[0074] According to the current temperature, the voltage value of the second driving voltage corresponding to the current temperature is determined from the correspondence between the preset display screen temperature and the voltage value of the second driving voltage, and the corresponding voltage value of the second driving voltage is used as the current voltage value of the second driving voltage.

[0075] For example, the current display screen temperature is 40° C., and according to Table 3, it can be obtained that ELVSS (ie, the second driving voltage) is -1.7.

[0076] In an exemplary embodiment, the preset voltage difference is 0.3V.

[0077] For example, if the current display screen temperature is 40° C., then according to Table 4, the second driving voltage (ie, ELVSS) is -1.7, and the initial voltage (ie, INIT) is -1.4.

[0078] Using ELVSS and INIT in Tables 3 and 4, the measured luminance and CIE coordinates of NOR9 L32, NOR8 L16, NOR7 L16, NOR6 L16, and NOR5 L16 are shown in Table 5.

[0079] Table 5 L / Wx / Wy of NOR9 L32, NOR8 L16, NOR7 L16, NOR6 L16, NOR5 L16 at different temperatures and different ELVSS

[0080] As can be seen from Table 5, after determining ELVSS and INIT according to the screen temperature, the luminance L and CIE coordinates of NOR9 L32, NOR8 L16, NOR7 L16, NOR6 L16, and NOR5 L16 all increase. As shown in Figure 4, the visual effect is also improved.

[0081] The embodiment of the present disclosure determines the current second driving voltage according to the current temperature of the display screen of the display device in accordance with a preset rule, wherein the preset rule is that when the first driving voltage is kept unchanged, the higher the current temperature, the lower the voltage value of the current second driving voltage, thereby improving the screen brightness.

[0082] In an exemplary embodiment, the current initial voltage is determined according to the current second driving voltage and a preset difference, thereby solving the problem of obvious screen flickering caused by obvious brightness jump when switching the second driving voltage.

[0083] The present disclosure also provides a voltage control device for a pixel circuit, comprising a memory and a processor.

[0084] The memory is used to store a program of a voltage control method for a pixel circuit;

[0085] The processor is used to read and execute the program for the voltage control method for the pixel circuit, and execute any one of the above-mentioned voltage control methods.

[0086] The present disclosure further provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable the computer to execute any of the above-mentioned voltage control methods.

[0087] Figure 5 is a schematic diagram of a display device according to at least one embodiment of the present disclosure. As shown in Figure 5, the display device provided by the present disclosure includes a display screen having a plurality of pixel units, each pixel unit including a pixel circuit; the pixel circuit includes a driving module and a light-emitting element; one end of the driving module is configured to receive a first driving voltage and drive the light-emitting element to emit light or extinguish light according to a light-emitting control signal and a data signal provided by the display device; the other end of the driving module is electrically connected to a first terminal of the light-emitting element; and a second terminal of the light-emitting element is configured to receive a second driving voltage.

[0088] It also includes a temperature sensor, the above-mentioned voltage control device and a power supply module;

[0089] The temperature sensor is configured to detect the current temperature of the display screen;

[0090] The power supply module is configured to provide the second driving voltage to the second electrodes of the light-emitting elements of the plurality of pixel units according to the current voltage value of the second driving voltage.

[0091] In an exemplary embodiment, at least one pixel circuit further includes an initialization module, the initialization module being electrically connected to the other end of the driving module of the pixel circuit and the first electrode of the light-emitting element, respectively, and the initialization module being configured to reset the first electrode of the light-emitting element according to an initial voltage; characterized in that,

[0092] The power supply module is further configured to provide an initial voltage to the initialization module according to a current initial voltage value.

[0093] Compared with the related art, the embodiment of the present disclosure determines the current second driving voltage according to the current temperature of the display screen of the display device in accordance with a preset rule, wherein the preset rule is that when the first driving voltage is kept unchanged, the higher the current temperature, the lower the voltage value of the current second driving voltage, thereby improving the screen brightness.

[0094] In an exemplary embodiment, the current initial voltage is determined according to the current second driving voltage and a preset difference, thereby solving the problem of obvious screen flickering caused by obvious brightness jump when switching the second driving voltage.

[0095] The present disclosure describes a plurality of embodiments, but this description is exemplary rather than restrictive, and it will be apparent to those skilled in the art that there may be more embodiments and implementations within the scope of the embodiments described in the present disclosure. Although many possible feature combinations are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are also possible. Unless specifically limited, any feature or element of any embodiment may be used in combination with any other feature or element in any other embodiment, or may replace any other feature or element in any other embodiment.

[0096] The present disclosure includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The disclosed embodiments, features, and elements of the present disclosure may also be combined with any conventional features or elements to form a unique inventive solution defined by the claims. Any features or elements of any embodiment may also be combined with features or elements from other inventive solutions to form another unique inventive solution defined by the claims. Therefore, it should be understood that any feature shown and / or discussed in this disclosure may be implemented individually or in any appropriate combination. Therefore, the embodiments are not subject to other limitations except for the limitations set forth in the appended claims and their equivalents. In addition, various modifications and changes may be made within the scope of protection of the appended claims.

[0097] In addition, when describing representative embodiments, the specification may have presented the method and / or process as a specific sequence of steps. However, to the extent that the method or process does not rely on the specific order of the steps described herein, the method or process should not be limited to the steps in the specific order described. As will be understood by those skilled in the art, other orders of steps are also possible. Therefore, the specific order of the steps set forth in the specification should not be interpreted as a limitation on the claims. In addition, the claims to the method and / or process should not be limited to performing their steps in the order written, and those skilled in the art can readily understand that these orders can be changed and still remain within the spirit and scope of the disclosed embodiments.

[0098] It will be appreciated by those skilled in the art that all or some of the steps, systems, and functional modules / units in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. In hardware implementations, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As is well known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable, and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, it is well known to those skilled in the art that communication media generally embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

Claims

1. A voltage control method for a pixel circuit, the pixel circuit comprising a driving module and a light-emitting element; one end of the driving module is configured to receive a first driving voltage and drive the light-emitting element to emit light or go out according to a light-emitting control signal and a data signal provided by a display device, the other end of the driving module is electrically connected to a first pole of the light-emitting element, and a second pole of the light-emitting element is configured to receive a second driving voltage; The voltage control method includes obtaining the current temperature of the display screen of the display device; determining the voltage value of the current second driving voltage according to the preset rule and the current temperature; wherein, the preset rule is that when the first driving voltage remains unchanged, the higher the current temperature, the larger the absolute value of the voltage value of the current second driving voltage.

2. The voltage control method according to claim 1, wherein the pixel circuit further includes an initialization module, and the initialization module is electrically connected to the other end of the driving module and the first pole of the light-emitting element respectively, and the initialization module is configured to reset the first pole of the light-emitting element according to an initial voltage; the voltage control method further includes: determining the voltage value of the current initial voltage according to the voltage value of the current second driving voltage and a preset difference.

3. The voltage control method according to claim 1, wherein determining the voltage value of the current second driving voltage according to the current temperature includes: determining the voltage value of the current second driving voltage according to the corresponding relationship between the current temperature, the preset display screen temperature and the voltage value of the second driving voltage.

4. The voltage control method according to claim 2, wherein determining the voltage value of the current initial voltage according to the voltage value of the current second driving voltage and a preset difference includes: taking the sum of the voltage value of the current second driving voltage and the preset difference as the voltage value of the current initial voltage.

5. The voltage control method according to claim 3, wherein determining the voltage value of the current second driving voltage according to the corresponding relationship between the current temperature, the preset display screen temperature and the voltage value of the second driving voltage includes: determining the voltage value of the second driving voltage corresponding to the current temperature from the corresponding relationship between the preset display screen temperature and the voltage value of the second driving voltage according to the current temperature, and taking the corresponding voltage value of the second driving voltage as the voltage value of the current second driving voltage.

6. The voltage control method according to claim 2 or 4, wherein the preset pressure difference is 0.3V.

7. A voltage control device for a pixel circuit, characterized in that, including a memory and a processor, characterized in that: the memory is used to store a program for the voltage control method of the pixel circuit; the processor is used to read and execute the program for the voltage control method of the pixel circuit, and execute the method according to any one of claims 1 to 6.

8. A computer-readable storage medium stores computer-executable instructions, wherein, The computer-executable instructions are used to cause the computer to execute the method according to any one of claims 1 to 6.

9. A display device includes a display screen having a plurality of pixel units, and each pixel unit includes a pixel circuit; The pixel circuit includes a driving module and a light-emitting element; one end of the driving module is configured to access a first driving voltage and drive the light-emitting element to emit light or go out according to a light-emitting control signal and a data signal provided by the display device, the other end of the driving module is electrically connected to the first pole of the light-emitting element, and the second pole of the light-emitting element is configured to access the second driving voltage; the display device further includes further includes a temperature sensor, the voltage control device according to claim 7 and a power supply module; the temperature sensor is configured to detect the current temperature of the display screen; The power supply module is configured to provide a second driving voltage to the second poles of the light-emitting elements of the plurality of pixel units according to the voltage value of the current second driving voltage.

10. The display device according to claim 9, wherein at least one pixel circuit further includes an initialization module, the initialization module is electrically connected to the other end of the driving module of the pixel circuit and the first pole of the light-emitting element respectively, and the initialization module is configured to reset the first pole of the light-emitting element according to an initial voltage; wherein, the power supply module is further configured to provide the initial voltage to the initialization module according to the voltage value of the current initial voltage.

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