Pixel circuit, driving method thereof, driving device and storage medium

Abstract

The embodiment of the present application discloses a pixel circuit and its driving method, driving device and storage medium. The first switch module of the pixel circuit is on for a first luminous period in the first subframe period and is on for a second luminous period in the second subframe period, and the duration of the first luminous period is less than the duration of the second luminous period. It can be seen that the duration of the first luminous period is short. If a lower brightness needs to be displayed at this time, a larger first data voltage can also be used for driving. That is, when the pixel circuit displays a lower brightness, it can ensure that the light-emitting module is in a stable state and no color deviation occurs. At the same time, the display brightness can be improved by adjusting the size of the first data voltage and the second data voltage. Therefore, the pixel circuit provided by the embodiment of the present application can ensure that no color deviation occurs when displaying a lower brightness, and can also display a higher brightness, with a good display effect.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a pixel circuit and a driving method, a driving device, and a storage medium thereof. Background Art

[0002] Glass substrates have high thermal conductivity and better dissipate heat, while also meeting the more complex wiring requirements of higher-density solder products. Furthermore, the high flatness of glass substrates facilitates breakthroughs in chip transfer technology. Compared to glass substrates, PCBs (Printed Circuit Boards) have poor heat dissipation due to inherent material limitations and are prone to warping and deformation in large-scale applications. Therefore, in terms of performance, glass substrates offer significant advantages over PCBs.

[0003] Fabricating a Micro LED (Micro Light Emitting Diode) panel on a glass substrate requires installing pixel circuits containing TFTs (Thin Film Transistors) and peripheral driver circuits to illuminate the Micro LEDs and achieve display. There are two types of TFT-based drive methods: active and passive.

[0004] However, the active driving method will cause color deviation when the driving light board displays low brightness, while the maximum brightness that the passive driving method can display is relatively small, resulting in poor display effect. Summary of the Invention

[0005] The embodiments of the present application disclose a pixel circuit and a driving method, a driving device, and a storage medium thereof. The pixel circuit has a good display effect.

[0006] The present application discloses a pixel circuit, which includes:

[0007] A light-emitting module, wherein the cathode of the light-emitting module is grounded;

[0008] a first switch module, wherein a first end of the first switch module is used to connect to a power supply voltage, and a second end of the first switch module is connected to an anode of the light-emitting module; a conduction period of the first switch module in a first subframe period is a first light-emitting period, and a conduction period of the first switch module in a second subframe period is a second light-emitting period, wherein the first light-emitting period is shorter than the second light-emitting period;

[0009] A driving module is connected to the control end of the first switching module and is used to determine the target brightness of the pixel circuit in a target frame period; and to determine a first data voltage and a second data voltage based on the target brightness, the first light-emitting time period, and the second light-emitting time period; the driving module is also used to control the control end of the first switching module to obtain the first data voltage during the first light-emitting time period; and to control the control end of the first switching module to obtain the second data voltage during the second light-emitting time period.

[0010] As an optional implementation manner, the first subframe period further includes a first compensation time period, and the second subframe period further includes a second compensation time period; and the pixel circuit further includes:

[0011] a second switch module, wherein a first end of the second switch module is connected to the control end of the first switch module, and a second end of the second switch module and the control end of the second switch module are connected to the driving module;

[0012] a third switch module, wherein a first end of the third switch module is connected to a second end of the first switch module, a second end of the third switch module is grounded, and a control end of the third switch module is connected to the driving module;

[0013] a first capacitor module, one end of the first capacitor module being connected to the control end of the first switch module, and the other end of the first capacitor module being connected to the second end of the first switch module;

[0014] In which, the driving module is also used to control the second end of the second switch module to be the first voltage during the first compensation time period and the second compensation time period, and control the second switch module and the third switch module to be in the on state, so that one end of the first capacitor module is the first voltage and the other end of the first capacitor module is the ground voltage; then control the third switch module to be in the off state, so that the voltage difference between the two ends of the first capacitor module gradually changes to the turn-on voltage of the first switch module.

[0015] As an optional implementation manner, the first subframe period further includes a third light-emitting period, and the second subframe period further includes a fourth light-emitting period;

[0016] The driving module is further configured to control the second switch module to be in an off state during a first light-emitting period and a second light-emitting period, control the second switch module to be in an on state during a third light-emitting period and a fourth light-emitting period, and control the voltage at the second end of the second switch module to be a second voltage so that the first switch module is in an off state.

[0017] As an optional implementation, the driving module includes:

[0018] a first switching unit;

[0019] a second switch unit, wherein a first end of the second switch unit is connected to the first end of the first switch unit, and a second end of the second switch unit is connected to the control end of the first switch module;

[0020] The driving unit is respectively connected to the control end of the first switch unit, the second end of the first switch unit and the control end of the second switch unit, and is used to control the second end of the first switch unit to obtain the first data voltage before the first light-emitting time period, and to put the first switch unit into a conductive state so that the first end of the second switch unit is the first data voltage, and to control the second switch unit to be in a conductive state at the start of the first light-emitting time period so that the control end of the first switch module obtains the first data voltage; the driving unit is also used to control the second end of the first switch unit to obtain the second data voltage before the second light-emitting time period, and to put the first switch unit into a conductive state so that the first end of the second switch unit is the second data voltage, and to control the second switch unit to be in a conductive state at the start of the second light-emitting time period so that the control end of the first switch module obtains the second data voltage.

[0021] As an optional implementation, a second capacitor module is further included, one end of the second capacitor module is connected to the first end of the second switch unit, and the other end of the second capacitor is connected to the first end of the first switch module.

[0022] An embodiment of the present application discloses a driving method for a pixel circuit, the method comprising:

[0023] Determining a target brightness of the pixel circuit in a target frame period; the pixel circuit includes a light-emitting module and a first switch module, the cathode of the light-emitting module is grounded, the first end of the first switch module is used to receive a power supply voltage, and the second end of the first switch module is connected to the anode of the light-emitting module; the target frame period includes a first sub-frame period and a second sub-frame period, the on-time period of the first switch module in the first sub-frame period is a first light-emitting period, and the on-time period of the first switch module in the second sub-frame period is a second light-emitting period, wherein the duration of the first light-emitting period is less than the duration of the second light-emitting period;

[0024] determining a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period;

[0025] In a first light-emitting period, the control end of the first switch module is controlled to obtain the first data voltage; in a second light-emitting period, the control end of the first switch module is controlled to obtain the second data voltage.

[0026] As an optional implementation manner, determining the first data voltage and the second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period includes:

[0027] When the target brightness is less than or equal to a minimum brightness threshold, the second data voltage is determined to be a preset voltage, wherein the preset voltage is less than a minimum threshold voltage.

[0028] As an optional implementation manner, determining the first data voltage and the second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period includes:

[0029] When the target brightness is greater than or equal to a maximum brightness threshold, the first data voltage is determined to be a maximum data voltage.

[0030] The embodiment of the present application discloses a driving device for a pixel circuit, comprising:

[0031] a brightness determination module, configured to determine a target brightness of the pixel circuit in a first frame period; the pixel circuit includes a light-emitting module and a first switch module, the cathode of the light-emitting module is grounded, a first end of the first switch module is configured to receive a power supply voltage, and a second end of the first switch module is connected to an anode of the light-emitting module; the first frame period includes a first sub-frame period and a second sub-frame period; a conduction period of the first switch module in the first sub-frame period is a first light-emitting period, and a conduction period in the second sub-frame period is a second light-emitting period; wherein the first light-emitting period is shorter than the second light-emitting period;

[0032] a voltage determination module, configured to determine a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period;

[0033] The light-emitting control module is used to control the control end of the first switch module to obtain the first data voltage in a first light-emitting period, and is also used to control the control end of the first switch module to obtain the second data voltage in a second light-emitting period.

[0034] An embodiment of the present application discloses a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the driving method of any pixel circuit disclosed in the embodiment of the present application is implemented.

[0035] Compared with the related art, the embodiments of the present application have the following beneficial effects:

[0036] The pixel circuit provided in the embodiment of the present application divides a frame period into two sub-frame periods (a first sub-frame period and a second sub-frame period), and the conduction period of the first switch module in the first sub-frame period is a first luminous period, and the conduction period in the second sub-frame period is a second luminous period, and the duration of the first luminous period is less than the duration of the second luminous period. It can be seen that the duration of the first luminous period is shorter. If a lower brightness needs to be displayed at this time, a larger driving current (a larger first data voltage) can also be used for driving. That is, when the pixel circuit displays a lower brightness, it can ensure that the light-emitting module is in a stable state and no color deviation occurs. At the same time, the display brightness can be improved by adjusting the size of the first data voltage and the second data voltage. Therefore, the pixel circuit provided in the embodiment of the present application can ensure that no color deviation occurs when displaying a lower brightness, and can also display a higher brightness, with a good display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 This is a schematic structural diagram of a pixel circuit disclosed in an embodiment of the present application;

[0039] Figure 2 is a schematic structural diagram of another pixel circuit disclosed in an embodiment of the present application;

[0040] Figure 3 This is a schematic structural diagram of another pixel circuit disclosed in an embodiment of the present application;

[0041] Figure 4 is a structural diagram of another pixel circuit disclosed in an embodiment of the present application;

[0042] Figure 5 This is a timing diagram of a pixel circuit disclosed in an embodiment of the present application;

[0043] Figure 6 This is a flowchart of a driving method for a pixel circuit disclosed in an embodiment of the present application;

[0044] Figure 7 This is a flow chart of another method for driving a pixel circuit disclosed in an embodiment of the present application;

[0045] Figure 8 This is a schematic structural diagram of a driving device for a pixel circuit disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0046] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0048] It will be understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor without departing from the scope of this application. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0049] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0050] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0051] As mentioned in the background, glass substrates offer significant performance advantages over PCBs. Furthermore, their cost is significantly lower than PCBs, ensuring the stability and accuracy required by emerging display products. Due to these advantages, glass-based Micro LED panels are poised to become a trend.

[0052] Actively driving LEDs achieves grayscale segmentation by controlling the current flowing through the LED, thereby controlling the brightness. Passively driving LEDs utilizes the human eye's persistence of vision (the longer the light duration within a frame period (typically 16.6ms), the greater the perceived brightness). This achieves grayscale segmentation by controlling the LED's light duration.

[0053] The inventors have discovered that when an actively driven LED is lit, at very low drive currents, the LED is in an unstable state. The color coordinates of the light color emitted by the LED are inconsistent with the color coordinates of the light color emitted by the LED in a stable state. This results in color deviation when the LED displays low brightness (the low brightness described herein corresponds to the current that causes the LED to be in an unstable state) under active drive. When a passively driven LED is lit, because it is driven by a constant current, the LED is in a stable state, and the brightness is controlled by dividing the light emission time, which does not cause color deviation. However, when a passively driven LED is lit, the maximum brightness is limited and difficult to increase because a dark state is required within one frame. In other words, when the passively driven LED is lit, the maximum brightness that can be displayed is relatively low. Consequently, the lighting effect of both the actively and passively driven LEDs is less than ideal.

[0054] In view of this, an embodiment of the present application provides a pixel circuit. Figure 1 , which shows a pixel circuit provided by an embodiment of the present application, which may include a light-emitting module 110, a first switch module 120, and a driving module 130. The first switch module 120 includes a first end, a second end, and a control end. The light-emitting module 110 includes an anode and a cathode. The cathode of the light-emitting module 110 is grounded. The first end of the first switch module 120 is used to receive a power supply voltage VDD. The second end of the first switch module 120 is connected to the anode of the light-emitting module 110. The control end of the first switch module 120 is connected to the driving module 130.

[0055] The power supply voltage VDD is used to provide an operating voltage for the light-emitting module 110 so that the light-emitting module 110 can be lit. Optionally, the light-emitting module 110 may include an LED. Optionally, the light-emitting color of the light-emitting module 110 may be red, green, or blue. The first switch module 120 can control the on and off of the first end of the first switch module 120 and the second end of the first switch module 120 according to the voltage of the control end, that is, the first switch module 120 has an on state and an off state. When the first switch module 120 is in the on state, the first end of the first switch module 120 and the second end of the first switch module 120 are connected; when the first switch module 120 is in the off state, the first end of the first switch module 120 and the second end of the first switch module 120 are disconnected.

[0056] It is understood that the light-emitting module 110 is used to display an image of a corresponding frame within each frame period. In the embodiment of the present application, the frame period is divided into a first sub-frame period and a second sub-frame period, wherein the first sub-frame period can be before or after the second sub-frame period. The conduction period of the first switch module 120 in the first sub-frame period is a first light-emitting period, and the conduction period in the second sub-frame period is a second light-emitting period. The duration of the first light-emitting period is shorter than the duration of the second light-emitting period.

[0057] The driver module 130 can be used to determine a target brightness for the pixel circuit during a target frame period and determine a first data voltage and a second data voltage based on the target brightness, the first light-emitting period, and the second light-emitting period. The driver module 130 is further configured to control the control terminal of the first switch module 120 to obtain the first data voltage during the first light-emitting period, and to control the control terminal of the first switch module 120 to obtain the second data voltage during the second light-emitting period. It will be appreciated that when the first switch module 120 is in the on state, the current flowing through the first and second terminals of the first switch module 120 can be controlled by controlling the voltage at the control terminal of the first switch module 120 to control the brightness of the light-emitting module 110. The brightness of the pixel circuit during the target frame period is the sum of the brightness during the first and second light-emitting periods. That is, the driver module 130 of the present embodiment applies the first data voltage to the control terminal of the first switch module 120 during the first light-emitting period and the second data voltage to the control terminal of the first switch module 120 during the second light-emitting period, so that the brightness of the light-emitting module 110 during the target frame period is the target brightness. The duration of the first light-emitting period and the duration of the second light-emitting period can be set as needed, and the embodiments of the present application do not limit this. When the duration of the first light-emitting period and the duration of the second light-emitting period are determined, by adjusting the magnitude of the data voltage (the first data voltage and the second data voltage) of the pixel circuit, the pixel circuit can display various brightness levels within the target frame period.

[0058] In an embodiment of the present application, the target frame period is divided into a first sub-frame period and a second sub-frame period, and the on-time period of the first switch module 120 in the first sub-frame period is a first luminous period, and the on-time period in the second sub-frame period is a second luminous period, and the length of the first luminous period is shorter than the length of the second luminous period. It can be seen that the length of the first luminous period is shorter, and even if a larger first data voltage is applied in the first luminous period, the luminous brightness of the luminous module 110 can be lower, so that when the pixel circuit displays a lower brightness, the luminous module 110 can also be in a stable state, and there will be no color deviation problem.

[0059] At the same time, the luminous brightness of the pixel circuit in the target frame period can be adjusted by adjusting the magnitude of the first data voltage and the second data voltage, that is, the luminous brightness of the pixel circuit in the target frame period can be increased by increasing the first data voltage and the second data voltage. Compared with passive driving, the luminous brightness of the light-emitting module 110 can be greatly improved, that is, the maximum brightness of the light-emitting module 110 can be made larger.

[0060] In summary, the pixel circuit provided in the embodiment of the present application can ensure that there is no color deviation when displaying lower brightness, and can also ensure that the maximum brightness of the light-emitting module 110 is large, that is, the display effect of the display device equipped with the pixel circuit is better.

[0061] As is understandable, a display device is generally provided with multiple pixel circuits. Due to differences in production processes, the turn-on voltage (or threshold voltage Vth) of the first switch module 120 of each pixel circuit is different. That is, when displaying the same grayscale, although the same data voltage is applied to the control terminal of the first switch module 120, the current flowing through the first terminal and the second terminal of the first switch module 120 are different. In other words, the brightness of the light-emitting module 110 is not uniform. In view of this, the embodiments of the present application provide another pixel circuit to eliminate this difference and ensure uniform brightness of the light-emitting module 110 of each pixel circuit.

[0062] Please refer to Figure 2 , which shows a pixel circuit provided by another embodiment of the present application, such as Figure 2As shown, the pixel circuit may further include a second switch module 140, a third switch module 150, and a first capacitor module 160. The second switch module 140 includes a first end, a second end, and a control end. The third switch module 150 includes a first end, a second end, and a control end. The first end of the second switch module 140 is connected to the control end of the first switch module 120, the second end of the second switch module 140 and the control end of the second switch module 140 are connected to the driving module 130, the first end of the third switch module 150 is connected to the second end of the first switch module 120, the second end of the third switch module 150 is grounded, and the control end of the third switch module 150 is connected to the driving module 130. One end of the first capacitor module 160 is connected to the control end of the first switch module 120, and the other end of the first capacitor module 160 is connected to the second end of the first switch module 120.

[0063] The first subframe period also includes a first compensation period, and the second subframe period also includes a second compensation period. It is understood that the first compensation period does not overlap with the first light-emitting period, and the second compensation period does not overlap with the second light-emitting period. The first compensation period precedes the first light-emitting period, and the second compensation period precedes the second light-emitting period. This allows the turn-on voltage of the first switch module 120 to be stored in the first capacitor module 160 before the light-emitting module 110 emits light, thereby preventing the light-emitting brightness of the light-emitting module 110 from being affected by the turn-on voltage of the first switch module 120.

[0064] Among them, the driving module 130 is also used to control the second end of the second switch module 140 to be the first voltage during the first compensation time period and the second compensation time period, and control the second switch module 140 and the third switch module 150 to be in the on state, so that one end of the first capacitor module 160 is the first voltage and the other end of the first capacitor module 160 is the ground voltage, and then control the third switch module 150 to be in the off state, so that the voltage difference between the two ends of the first capacitor module 160 gradually changes to the turn-on voltage of the first switch module 120.

[0065] It should be noted that the second switch module 140 has an on state and an off state. When the second switch module 140 is in the on state, the first end of the second switch module 140 and the second end of the second switch module 140 are connected; when the second switch module 140 is in the off state, the first end of the second switch module 140 and the second end of the second switch module 140 are disconnected. Similarly, the third switch module 150 has an on state and an off state. When the third switch module 150 is in the on state, the first end of the third switch module 150 and the second end of the third switch module 150 are connected; when the third switch module 150 is in the off state, the first end of the third switch module 150 and the second end of the third switch module 150 are disconnected. When the third switch module 150 is in the off state and the light-emitting module 110 is not lit (not turned on), the second end of the first switch module 120 is in a suspended state. Since the second switch module 140 is in the on state, the voltage at the control end of the first switch module 120 is the first voltage, and the first switch module 120 is in the on state. At this time, the current of the first switch module 120 flows from the first end to the second end, and the voltage at the second end of the first switch module 120 gradually increases until the current flowing through the first and second ends of the first switch module 120 is zero. The voltage difference between the two ends of the first capacitor module 160 is converted to the turn-on voltage of the first switch module 120. At this time, the voltage at the other end of the first capacitor module 160 remains unchanged, that is, the first capacitor module 160 stores the turn-on voltage of the first switch module 120.

[0066] In the first light-emitting period, the driving module 130 controls the control terminal of the first switch module 120 to obtain the first data voltage. Since the voltage difference between the two ends of the first capacitor module 160 in the first compensation period is the turn-on voltage of the first switch module 120, the current I flowing through the first and second ends of the first switch module 120 is ds As shown in the following formula (1.1).

[0067] I ds =K

(Vdata1+Vth)-Vth

[0068] Wherein, K is the intrinsic conductivity factor of the first switch module 120 , Vdata1 is the first data voltage, and Vth is the turn-on voltage of the first switch module 120 .

[0069] As shown in formula (1.1), the current flowing through the first end and the second end of the first switch module 120 at this time is independent of the turn-on voltage of the first switch module 120, thereby eliminating the difference in luminous brightness caused by the different turn-on voltages of the first switch module 120 of each pixel circuit.

[0070] Similarly, in the second light-emitting period, the driving module 130 controls the control terminal of the first switch module 120 to obtain the second data voltage. Since the voltage difference between the two ends of the first capacitor module 160 in the second compensation period is the turn-on voltage of the first switch module 120, at this time, the current I flowing through the first and second ends of the first switch module 120 is ds As shown in the following formula (1.2).

[0071] I ds =K

(Vdata2+Vth)-Vth

[0072] Wherein, K is the intrinsic conductivity factor of the first switch module 120 , Vdata2 is the second data voltage, and Vth is the turn-on voltage of the first switch module 120 .

[0073] As shown in formula (1.2), the current flowing through the first end and the second end of the first switch module 120 at this time is independent of the turn-on voltage of the first switch module 120, thereby eliminating the difference in luminous brightness caused by the different turn-on voltages of the first switch module 120 of each pixel circuit.

[0074] Optionally, the first capacitor module 160 may include a first capacitor, one end of the first capacitor is connected to the control end of the first switch module 120, and the other end of the first capacitor is connected to the second end of the first switch module 120, that is, one end of the first capacitor serves as one end of the first capacitor module 160, and the other end of the first capacitor serves as the other end of the first capacitor module 160.

[0075] The pixel circuit provided in this embodiment is provided with a second switch module 140, a third switch module 150 and a first capacitor module 160, which can achieve that the voltage difference between the two ends of the first capacitor module 160 in the first compensation time period and the second compensation time period is the turn-on voltage of the first switch module 120 of the pixel circuit, so that in the first light-emitting time period, the current flowing through the light-emitting module 110 is independent of the turn-on voltage of the first switch module 120, and in the second light-emitting time period, the current flowing through the light-emitting module 110 is independent of the turn-on voltage of the first switch module 120, so that the light-emitting brightness of the light-emitting module 110 is not affected by the turn-on voltage, and can ensure that the light-emitting brightness of the light-emitting module 110 is consistent when the same data voltage is applied to the control ends of different first switch modules 120.

[0076] In one embodiment, the driving module 130 includes a first control terminal, a second control terminal, a third control terminal, and a fourth control terminal. The first control terminal of the driving module 130 is connected to the control terminal of the first switch module 120 and is configured to provide a first data voltage and a second data voltage to the control terminal of the first switch module 120. The second control terminal of the driving module 130 is connected to the second terminal of the second switch module 140 and is configured to provide the first voltage to the second terminal of the second switch module 140 during the first compensation period and the second compensation period. The third control end of the driving module 130 is connected to the control end of the second switch module 140, and the fourth control end of the driving module 130 is connected to the control end of the third switch module 150, and is used to control the second switch module 140 and the third switch module 150 to be in the on state during the first compensation time period and the second compensation time period, so that one end of the first capacitor module 160 is the first voltage and the other end of the first capacitor module 160 is the ground voltage, and control the third switch module 150 to be in the off state when one end of the first capacitor module 160 is the first voltage and the other end of the first capacitor module 160 is the ground voltage, so that the voltage difference between the two ends of the first capacitor module 160 can be the turn-on voltage of the first switch module 120.

[0077] In one embodiment, different types of first switch modules 120 can be selected so that when the voltage difference across the first capacitor module 160 is equal to the turn-on voltage of the first switch module 120, the light-emitting module 110 is still not illuminated, thereby achieving a voltage difference across the first capacitor module 160 equal to the turn-on voltage of the first switch module 120 (i.e., the difference in light-emitting brightness of each pixel circuit can be eliminated).

[0078] In another embodiment, the pixel circuit further includes a fourth switch module, the fourth switch module including a first end, a second end, and a control end. The first end of the fourth switch module is connected to the second end of the first switch module 120, the second end of the fourth switch module is connected to the anode of the light-emitting module 110, and the control end of the fourth switch module is connected to the driving module 130. The driving module 130 can also be used to control the fourth switch module to be in an off state during the first compensation period and the second compensation period, that is, the first end of the fourth switch module and the second end of the fourth switch module are disconnected, so as to prevent the light-emitting module 110 from being illuminated during the compensation period (the first compensation period and the second compensation period). The driving module is also used to control the fourth switch module to be in an on state during the first light-emitting period and the second light-emitting period, so that the light-emitting module 110 can be illuminated during the first light-emitting period and the second light-emitting period.

[0079] In one embodiment, the driving module 130 can also be used to control the second switch module 140 to be disconnected during the first light-emitting time period and the second light-emitting time period, control the second switch module 140 to be turned on during the third light-emitting time period and the fourth light-emitting time period, and control the voltage at the second end of the second switch module 140 to be the second voltage, so that the first switch module 120 is in the disconnected state.

[0080] The first compensation period, the first light-emitting period, and the third light-emitting period constitute a first subframe period, and the first compensation period, the first light-emitting period, and the third light-emitting period do not overlap. The second compensation period, the second light-emitting period, and the fourth light-emitting period constitute a second subframe period, and the second compensation period, the second light-emitting period, and the fourth light-emitting period do not overlap. It will be appreciated that the second voltage is less than the first voltage. This embodiment does not limit the magnitude of the second voltage; as long as the voltage at the control terminal of the first switch module 120 is the second voltage, the first switch module 120 is in the off state. Optionally, the second voltage is a ground voltage.

[0081] In this embodiment, since the control end of the first switch module 120 obtains the first data voltage during the first light-emitting time period, the first switch module 120 is in the on state, at which time the light-emitting module 110 emits light, and the light-emitting brightness of the light-emitting module 110 corresponds to the first data voltage. The driving module 130 controls the second switch module 140 to be in the on state during the third light-emitting time period. At this time, the voltage of the control end of the first switch module 120 is pulled to the second voltage, the first switch module 120 enters the off state, and the light-emitting module 110 is off, thereby ensuring that the on time period of the first switch module 120 in the first subframe period is the first light-emitting time period. Similarly, in the second luminous time period, the control end of the first switch module 120 obtains the second data voltage, and the first switch module 120 is in the on state. At this time, the light-emitting module 110 emits light, and the luminous brightness of the light-emitting module 110 corresponds to the second data voltage. The driving module 130 controls the third switch module 150 to be in the on state during the fourth luminous time period. At this time, the voltage of the control end of the first switch module 120 is pulled to the second voltage, the first switch module 120 enters the off state, and the light-emitting module 110 is off, thereby ensuring that the on time period of the first switch module 120 in the second subframe period is the second luminous time period.

[0082] Please refer to Figure 3 , which shows another pixel circuit provided by an embodiment of the present application, such as Figure 3As shown, the driving module may include a first switch unit 131, a second switch unit 132, and a driving unit 133. The first switch unit 131 includes a first end, a second end, and a control end, and the second switch unit 132 includes a first end, a second end, and a control end. The first end of the first switch unit 131 is connected to the first end of the second switch unit 132, the second end of the second switch unit 132 is connected to the control end of the first switch module 120, and the driving unit 133 is connected to the control end of the first switch unit 131, the second end of the first switch unit 131, and the control end of the second switch unit 132, respectively.

[0083] The driving unit 133 can be used to control the second end of the first switch unit 131 to obtain the first data voltage before the first light-emitting period (such as the first compensation period), and to turn on the first switch unit 131 so that the first end of the second switch unit 132 is the first data voltage. At the start of the first light-emitting period, the second switch unit 132 can be controlled to be turned on so that the control end of the first switch module 120 obtains the first data voltage. The driving unit 133 can also be used to control the second end of the second switch unit 132 to obtain the second data voltage before the second light-emitting period (such as the second compensation period), and to turn on the first switch unit 131 so that the first end of the second switch unit 132 is the second data voltage. At the start of the second light-emitting period, the second switch unit 132 can be controlled to be turned on so that the control end of the first switch module 120 obtains the second data voltage.

[0084] It should be noted that the first switch unit 131 has an on state and an off state. When the first switch unit 131 is in the on state, the first end of the first switch unit 131 and the second end of the first switch unit 131 are connected; when the first switch unit 131 is in the off state, the first end of the first switch unit 131 and the second end of the first switch unit 131 are disconnected. Similarly, the second switch unit 132 has an on state and an off state. When the second switch unit 132 is in the on state, the first end of the second switch unit 132 and the second end of the second switch unit 132 are connected; when the second switch unit 132 is in the off state, the first end of the second switch unit 132 and the second end of the second switch unit 132 are disconnected.

[0085] In this embodiment, a driving module including a first switch unit 131, a second switch unit 132 and a driving unit 133 is provided, so that the data voltage (the first data voltage and the second data voltage) can be pre-written into the first end of the second switch unit 132, and the control end of the first switch module 120 obtains the first data voltage in the first light-emitting time period, and the control end of the second light-emitting module 110 obtains the second data voltage in the second light-emitting time period.

[0086] Please continue to refer to Figure 3 The pixel circuit may further include a second capacitor module 170, one end of the second capacitor module 170 is connected to the first end of the first switch module 120, and the other end of the second capacitor module 170 is connected to the first end of the second switch unit 132 (that is, the first end of the first switch unit 131).

[0087] In one embodiment, the second capacitor module 170 may include a second capacitor, one end of which is connected to the first end of the first switch module 120, and the other end of the second capacitor is connected to the first end of the second switch unit 132 (that is, the first end of the first switch unit 131), that is, one end of the second capacitor serves as one end of the second capacitor module 170, and the other end of the second capacitor serves as the other end of the second capacitor module 170.

[0088] The pixel circuit provided in this embodiment, by setting the second capacitor module 170, ensures that when the first switch unit 131 is in the disconnected state, the voltage at the other end of the second capacitor module 170 is still the data voltage (the first data voltage or the second data voltage), ensuring that when the second switch unit 132 is in the on state, the data voltage can be transmitted to the control end of the first switch module 120, so that the control end of the first switch module 120 can obtain the first data voltage at the starting moment of the first light-emitting time period, or the control end of the first switch module 120 can obtain the second data voltage at the starting moment of the second light-emitting time period.

[0089] As can be seen from the above description, the display device may include multiple pixel circuits. Optionally, the multiple pixel circuits may be arranged in an array, and the driving unit 133 may be used to control the first switching units 131 and the second switching units 132 of the multiple pixel circuits, that is, each pixel circuit may share one driving unit 133. The multiple pixel circuits are arranged in an array, and the driving unit 133 may simultaneously control the first switching units 131 of the multiple pixel circuits in the same column to be in an on state or an off state, so as to write the data voltage (the first data voltage and the second data voltage) corresponding to each pixel circuit to the first end of the second switching unit 132, and then sequentially turn on the first switching units 131 of the multiple pixel circuits in each column to achieve the writing of the data voltage to the first end of each corresponding second switching unit 132.

[0090] It should be noted that, in one embodiment, the driving unit 133 is connected to the second end of the second switch module, the control end of the second switch module, and the control end of the third switch module. The driving unit 133 is also used to control the second end of the second switch module to be the first voltage, and control the second switch module and the third switch module to be in the on state during the first compensation time period and the second compensation time period, so that one end of the first capacitor module is the first voltage and the other end of the first capacitor module is the ground voltage; then control the third switch module to be in the off state, so that the voltage difference between the two ends of the first capacitor module gradually changes to the turn-on voltage of the first switch module 120.

[0091] In one embodiment, the driving unit is further used to control the second switch module to be in an off state during the first light-emitting time period and the second light-emitting time period, and to control the second switch module to be in an on state during the third light-emitting time period and the fourth light-emitting time period, and to control the voltage at the second end of the second switch module to be the second voltage, so that the first switch module 120 is in an off state.

[0092] In one embodiment, the driving unit may be used to simultaneously control the on / off states of the second switch module and the third switch module of each pixel circuit, as well as the voltage at the second end of the second switch module.

[0093] In one embodiment, at least one of the first switch module 120, the second switch module, the third switch module, the fourth switch unit, the fifth switch unit and the fourth switch module of the above embodiment includes a TFT. It can be understood that the gate of the TFT can serve as the control end of the module and the unit (at least one of the first switch module 120, the second switch module, the third switch module, the fourth switch unit, the fifth switch unit and the fourth switch module), the source of the TFT can serve as one of the first end and the second end of the module and the unit, and the drain of the TFT can serve as the other of the first end and the second end of the module and the unit.

[0094] Please refer to Figure 4 , which shows another pixel circuit provided by an embodiment of the present application, such as Figure 4 As shown, the first switch module includes a first thin film field effect transistor T1, the second switch module includes a second thin film field effect transistor T2, the third switch module includes a third thin film field effect transistor T3, the first switch unit includes a fourth thin film field effect transistor T4, the second switch unit includes a fifth thin film field effect transistor T5, the first capacitor module includes a first capacitor C1, the second capacitor module includes a second capacitor C2, the light emitting module includes a light emitting diode D1, and the pixel circuit may further include a driving unit ( Figure 4 Not shown). Figure 4As shown, one of the source or drain of the first thin-film field effect transistor T1 is used to access the power supply voltage VDD, the other of the source or drain of the first thin-film field effect transistor T1 is respectively connected to the other end of the first capacitor C1, the anode of the light-emitting diode D1, and one of the source or drain of the third thin-film field effect transistor T3, the other of the source or drain of the third thin-film field effect transistor T3 and the cathode of the light-emitting diode D1 are grounded, and the gate of the first thin-film field effect transistor T1 is respectively connected to one end of the first capacitor C1, one of the source or drain of the second thin-film field effect transistor T2, and one of the source or drain of the fifth thin-film field effect transistor T5. The other of the source or drain of the fifth thin-film field-effect transistor T5 is connected to the other end of the second capacitor C2 and one of the source or drain of the fourth thin-film field-effect transistor T4, one end of the second capacitor C2 is connected to one of the source or drain of the first thin-film field-effect transistor T1, the other of the source or drain of the second thin-film field-effect transistor T2, the gate of the second thin-film field-effect transistor T2, the gate of the third thin-film field-effect transistor T3, the gate of the fourth thin-film field-effect transistor T4, the other of the source or drain of the fourth thin-film field-effect transistor T4, and the gate of the fifth thin-film field-effect transistor T5 are connected to the driving unit.

[0095] Please refer to Figure 4 and Figure 5 The driving unit provides a reference voltage Vref to the other of the source or drain of the second thin-film field effect transistor T2, provides a reset voltage Reset to the gate of the second thin-film field effect transistor T2, provides a compensation voltage Com_vth to the gate of the third thin-film field effect transistor T3, provides a column scanning voltage Scan(i) to the gate of the fourth thin-film field effect transistor T4, where 0≤i≤n (the display device includes n+1 columns of pixel circuits, and the column scanning voltage Scan(i) represents the column scanning voltage corresponding to the i-th column), provides a data voltage (a first data voltage and a second data voltage) to the other of the source or drain of the fourth thin-film field effect transistor T4, and provides an emission voltage Emitting to the gate of the fifth thin-film field effect transistor T5.

[0096] like Figure 5As shown, in a first compensation time period state1 of a first sub-frame period Sub-frame1 of a target frame period 1fame, the driving unit controls the reset voltage Reset and the reference voltage Vref to be the first voltage, and controls the compensation voltage Com_vth to be the first voltage at the start moment of the first compensation time period state1, thereby controlling the second thin-film field effect transistor T2 and the third thin-film field effect transistor T3 to be in the on state, so that the voltage VG at point G is the reference voltage Vref, and the voltage VS at point S is the ground voltage, and then controls the compensation voltage Com_vth to be the second voltage, so that the third thin-film field effect transistor T3 is in the off state. At this time, due to the capacitive coupling effect, the voltage VG at point G remains unchanged and remains Vref, and the point S is in a floating state. The voltage VS at point S will climb up until VG-VS=Vth (where Vth is the turn-on voltage of the first thin-film field effect transistor T1), and the voltage VS at point S remains stable. Then, the reset voltage Reset is controlled to the second voltage, so that the second thin-film field effect transistor T2 is in the off state, thereby storing Vth in the second capacitor C2.

[0097] Please continue to refer to Figure 5 It can be understood that, for the display device, the column scanning voltage Scan(i) can drive the on and off of the fourth thin film field effect transistors T4 of all pixel circuits in the i-th column. In the first compensation period state1, the column scanning voltage Scan(i) is controlled to be the first voltage, thereby writing the first data voltage Vdata1 to the point P, that is, the voltage VP at the point P is Vdata1( Figure 5 VP shown in is the voltage of point P corresponding to a pixel circuit in column 0. Therefore, at the start time of state1, the voltage VP of point P is Vdata1), thereby realizing that the first data voltage Vdata1 is stored at point P during the first compensation period state1.

[0098] Please continue to refer to Figure 5, in the second light-emitting time period t1, the emission voltage Emitting is controlled to be the first voltage, so that the fifth thin-film field-effect transistor T5 is in the on state. At this time, the voltage at point G is Vth+Vdata1. At this time, the first thin-film field-effect transistor T1 is in the on state, and the light-emitting diode D1 is lit. When the first thin-film field-effect transistor T1 is in the on state for the length of the first light-emitting time period t1 (that is, the end moment of the first light-emitting time period), the reset voltage Reset is controlled to be the first voltage, and the reference voltage Vref is controlled to be the second voltage, so that the first thin-film transistor T1 is in the off state, so that the light-emitting diode D1 is extinguished. It can be understood that controlling the reference voltage Vref to be the second voltage can be achieved when the second thin-film field-effect transistor T2 is in the off state, that is, it is not necessary to control the reset voltage Reset to the first voltage and the reference voltage Vref to the second voltage at the same time in the second light-emitting time period t1.

[0099] It can be understood that the control timing of the second compensation period state3 of the second sub-frame period Sub-frame2 is similar to the control timing of the first compensation period state1 of the first sub-frame period Sub-frame1, except that the second data voltage Vdata2 stored at point P during the second compensation period state3 of the second sub-frame period Sub-frame2 may be different from the first data voltage Vdata1 stored at point P during the first compensation period state1 of the first sub-frame period Sub-frame1. The control timing of the second light-emitting period t2 of the second sub-frame period Sub-frame2 is similar to the control timing of the first light-emitting period t1 of the first sub-frame period Sub-frame1, except that the duration of the second light-emitting period t2 is different from the duration of the first light-emitting period t1, and thus the reset voltage Reset and the reference voltage Vref should be controlled accordingly based on the end time of the second light-emitting period t2.

[0100] It is understandable that the above embodiment only uses the first voltage and the second voltage, but the above embodiment is only one example, and other voltages may also be used as long as the corresponding purpose can be achieved.

[0101] In an embodiment of the present application, the length of the first light-emitting time period t1 and the length of the second light-emitting time period t2 are predetermined, so that when determining the target brightness of the pixel circuit in the target frame period, the magnitude of the first data voltage Vdata1 and the second data voltage Vdata2 can be determined according to the target brightness, the length of the first light-emitting time period t1 and the length of the second light-emitting time period t2, so that the light-emitting brightness of the pixel circuit in the target frame period is the target brightness, and no color deviation occurs when displaying a lower brightness, and the maximum light-emitting brightness can also be made larger.

[0102] It can be understood that the reset voltage Reset, the reference voltage Vref, the compensation voltage Com_vth, and the emission voltage Emitting are global variables, that is, each pixel circuit of the display device can share the same reset voltage Reset, the reference voltage Vref, the compensation voltage Com_vth, and the emission voltage Emitting, thereby reducing the wiring complexity of the display device. Scan(i) is the scanning voltage that controls each pixel circuit in the i-th column. The data voltage Vdata corresponds to each pixel circuit one by one, so that when the duration of the first light-emitting time period t1 and the duration of the second light-emitting time period t2 are determined, the light-emitting brightness of each pixel circuit can be different.

[0103] The present application also provides a display device comprising a plurality of pixel circuits according to any of the above embodiments. Optionally, each pixel circuit is disposed on a glass substrate and arranged in an array. Optionally, each pixel circuit may share a common driving unit.

[0104] In one embodiment, the driving unit is configured to receive video data of a target frame period, and determine a target brightness of each pixel circuit in the target frame period according to the video data of the target frame period.

[0105] In one embodiment, the driving unit is further configured to be connected to a power supply module, which can be configured to provide the driving module with an operating voltage and a data voltage for driving the light-emitting module to light up.

[0106] In one embodiment, the driving unit may further include a first input terminal and a second input terminal. The first input terminal of the driving unit is used to receive video data of a target frame period, and the second input terminal of the driving unit is used to connect to the power supply module.

[0107] Please refer to Figure 6 , which shows a driving method of a pixel circuit provided by an embodiment of the present application, such as Figure 6 As shown, the driving method of the pixel circuit may include steps S620 to S660.

[0108] S620, determining a target brightness of the pixel circuit in a target frame period.

[0109] The pixel circuit may include a light-emitting module and a first switch module. The light-emitting module includes a cathode and an anode. The first switch module includes a first terminal, a second terminal, and a control terminal. The cathode of the light-emitting module is grounded. The first terminal of the first switch module is used to receive a power supply voltage, and the second terminal of the first switch module is connected to the anode of the light-emitting module. It is understood that when the first switch module is in an on state, the light-emitting module can be illuminated under the drive of the power supply voltage.

[0110] Among them, the target frame period includes a first sub-frame period and a second sub-frame period, the conduction time period of the first switch module in the first sub-frame period is a first luminous time period, and the conduction time period of the first switch module in the second sub-frame period is a second luminous time period, wherein the length of the first luminous time period is less than the length of the second luminous time period.

[0111] S640 , determining a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period.

[0112] In one embodiment, determining the first data voltage and the second data voltage based on the target brightness, the first light-emitting period, and the second light-emitting period includes determining the first data voltage and the second data voltage based on the target brightness, the duration of the first light-emitting period, and the duration of the second light-emitting period. Since the light-emitting brightness is related to the light-emitting duration and the magnitude of the data voltage, the first data voltage and the second data voltage can be determined based on the target brightness, the duration of the first light-emitting period, and the duration of the second light-emitting period, so that the light-emitting brightness of the pixel circuit in the target frame period is the target brightness.

[0113] S660 , in a first light-emitting period, controlling the control end of the first switch module to obtain a first data voltage; in a second light-emitting period, controlling the control end of the first switch module to obtain a second data voltage.

[0114] In the driving method for a pixel circuit provided in an embodiment of the present application, the on-time period of the first switch module in the first subframe period of the target frame period is a first luminous period, and the on-time period of the first switch module in the second subframe period of the target frame period is a second luminous period, and the duration of the first luminous period is shorter than the duration of the second luminous period. Therefore, it can be seen that the duration of the first luminous period is shorter. The driving method provided in an embodiment of the present application can control the control terminal of the first switch module to obtain a larger first data voltage during the first luminous period, and can also reduce the luminous brightness of the luminous module. Therefore, when the pixel circuit displays a lower brightness, the luminous module can remain in a stable state without causing color deviation.

[0115] At the same time, the driving method can adjust the luminous brightness of the pixel circuit in the target frame period by adjusting the size of the first data voltage and the second data voltage, that is, the luminous brightness of the pixel circuit in the target frame period can be increased by increasing the first data voltage and the second data voltage. Compared with passive driving, the luminous brightness of the light-emitting module can be greatly improved, that is, the maximum brightness of the light-emitting module can be made larger.

[0116] To sum up, the driving method of the pixel circuit provided in the embodiment of the present application can ensure that the pixel circuit will not have color deviation when displaying lower brightness, and can also ensure that the display brightness of the light-emitting module is relatively high. That is, by driving the pixel circuit for display through the driving method provided in the embodiment of the present application, the display effect can be improved.

[0117] Please refer to Figure 7 , which shows another driving method of a pixel circuit provided by an embodiment of the present application, such as Figure 7 As shown, determining the first data voltage and the second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period may include step S642.

[0118] S620, determining a target brightness of the pixel circuit in a target frame period.

[0119] S642: When the target brightness is less than or equal to the minimum brightness threshold, determine that the second data voltage is a preset voltage.

[0120] The preset voltage is less than the minimum threshold voltage, and the first brightness threshold may include the brightness corresponding to the minimum driving current at which the light-emitting module is in a stable state. That is, in the case of active drive, when the light-emitting brightness of the light-emitting module is less than the first brightness threshold, the light-emitting module is in an unstable state. The minimum threshold voltage may be the minimum voltage that can illuminate the light-emitting module, that is, when the control terminal of the first switch module obtains the minimum threshold voltage, the light-emitting module can be illuminated.

[0121] The embodiments of the present application provide a method for driving a pixel circuit. When the target brightness is less than or equal to the minimum brightness threshold, the second data voltage can be controlled to be less than the minimum threshold voltage, so that the light-emitting module does not emit light during the second light-emitting period, thereby avoiding the light-emitting module being in an unstable state. At the same time, because the first light-emitting period is short, a larger first data voltage can be applied to the control terminal of the first switch module to ensure that the brightness of the pixel circuit during the target frame period is the target brightness, and color deviation of the pixel circuit will not occur. Optionally, the preset voltage can be a ground voltage.

[0122] Optionally, determining the first data voltage and the second data voltage based on the target brightness, the first light-emitting period, and the second light-emitting period may further include determining the first data voltage based on the target brightness and the first light-emitting period. It is understandable that since the second data voltage is less than the minimum threshold voltage, that is, the display brightness of the pixel circuit in the second light-emitting period is 0, when the first light-emitting period is fixed, the magnitude of the first data voltage can be determined based on the target brightness, and the first data voltage is positively correlated with the target brightness.

[0123] S660 , in a first light-emitting period, controlling the control end of the first switch module to obtain a first data voltage; in a second light-emitting period, controlling the control end of the first switch module to obtain a second data voltage.

[0124] Please continue to refer to Figure 7 In one embodiment, the first data voltage and the second data voltage are determined according to the target brightness, the first light-emitting period, and the second light-emitting period, and step S644 may be further included.

[0125] S644: When the target brightness is greater than or equal to the maximum brightness threshold, determine the first data voltage as the maximum data voltage.

[0126] The maximum brightness threshold includes a brightness greater than the maximum brightness of the passive drive, and the maximum data voltage is the maximum data voltage that the driving unit can provide. The driving method provided in the embodiment of the present application applies the maximum data voltage to the control terminal of the first switch module when the target brightness is greater than or equal to the maximum brightness threshold, so that the current flowing through the light-emitting module in the first light-emitting period is maximized (the first light-emitting period is fixed), and the brightness of the light-emitting module in the first light-emitting period is maximized, thereby achieving a higher light-emitting brightness of the light-emitting module in the target frame period.

[0127] Optionally, determining the first data voltage and the second data voltage based on the target brightness, the first light-emitting period, and the second light-emitting period may further include determining the second data voltage based on the target brightness, the first light-emitting period, the second light-emitting period, and the maximum data voltage. It will be understood that since the light-emitting brightness of the pixel circuit during the target frame period is the superposition of the light-emitting brightness of the pixel circuit during the first light-emitting period and the second light-emitting period, when the first light-emitting period, the second light-emitting period, and the maximum data voltage are fixed, the magnitude of the second data voltage can be determined based on the target brightness, and the second data voltage is positively correlated with the target brightness.

[0128] It should be understood that although Figure 6-7 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. In addition, Figure 6-7 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0129] Please refer to Figure 8, which shows a driving device for a pixel circuit provided by an embodiment of the present application. Figure 8 As shown, the pixel circuit driving device 800 may include a brightness determination module 820, a voltage determination module 840, and a light control module 860. The brightness determination module 820 is configured to determine a target brightness of the pixel circuit during a target frame period. The pixel circuit includes a light-emitting module and a first switch module. The cathode of the light-emitting module is grounded, the first terminal of the first switch module is connected to a power supply voltage, and the second terminal of the first switch module is connected to the anode of the light-emitting module. The first frame period includes a first sub-frame period and a second sub-frame period. The first switch module is on during the first sub-frame period as a first light-emitting period, and is on during the second sub-frame period as a second light-emitting period. The first light-emitting period is shorter than the second light-emitting period. The voltage determination module 840 is configured to determine a first data voltage and a second data voltage based on the target brightness, the first light-emitting period, and the second light-emitting period. The light control module 860 is configured to control the control terminal of the first switch module to obtain the first data voltage during the first light-emitting period, and to control the control terminal of the first switch module to obtain the second data voltage during the second light-emitting period.

[0130] In one embodiment, the voltage determination module may include a first voltage unit, wherein the first voltage unit is configured to determine the second data voltage to be a preset voltage when the target brightness is less than or equal to a minimum brightness threshold, and the preset voltage is less than the minimum threshold voltage.

[0131] In one embodiment, the voltage determination module may include a second voltage unit, wherein the second voltage unit is configured to determine the first data voltage as the maximum data voltage when the target brightness is greater than or equal to a maximum brightness threshold.

[0132] For the specific definition of the driving device of the pixel circuit, please refer to the definition of the driving method of the pixel circuit above, which will not be repeated here. The various modules in the driving device of the pixel circuit can be implemented in whole or in part by software, hardware, and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0133] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the following is achieved: determining a target brightness of a pixel circuit in a target frame period; determining a first data voltage and a second data voltage based on the target brightness, a first light-emitting time period, and a second light-emitting time period; controlling the control end of a first switch module to obtain the first data voltage during the first light-emitting time period; and controlling the control end of the first switch module to obtain the second data voltage during the second light-emitting time period.

[0134] In one embodiment, when the computer program is executed by the processor, the following is further achieved: when the target brightness is less than or equal to the minimum brightness threshold, determining the second data voltage to be a preset voltage, the preset voltage being less than the minimum threshold voltage.

[0135] In one embodiment, when the computer program is executed by the processor, the computer program further implements: when the target brightness is greater than or equal to a maximum brightness threshold, determining the first data voltage to be a maximum data voltage.

[0136] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static random access memory (SRAM) and dynamic random access memory (DRAM).

[0137] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0138] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A pixel circuit, characterized in that: The pixel circuit comprises: A light-emitting module, wherein the cathode of the light-emitting module is grounded; a first switch module, wherein a first end of the first switch module is used to connect to a power supply voltage, and a second end of the first switch module is connected to an anode of the light-emitting module; a conduction period of the first switch module in a first subframe period is a first light-emitting period, and a conduction period of the first switch module in a second subframe period is a second light-emitting period, wherein the first light-emitting period is shorter than the second light-emitting period; a second switch module, wherein a first end of the second switch module is connected to a control end of the first switch module; a third switch module, wherein a first end of the third switch module is connected to a second end of the first switch module, and a second end of the third switch module is grounded; a first capacitor module, one end of the first capacitor module being connected to the control end of the first switch module, and the other end of the first capacitor module being connected to the second end of the first switch module; a driving module, connected to the control end of the first switch module, the second end of the second switch module, the control end of the second switch module, and the control end of the third switch module, respectively, the driving module being configured to determine a target brightness of the pixel circuit in a target frame period; and to determine a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period; the target frame period includes a first sub-frame period and a second sub-frame period, the first sub-frame period includes a first compensation period, the first light-emitting period, and a third light-emitting period, and the second sub-frame period also includes a second compensation period, the second light-emitting period, and a fourth light-emitting period; The driving module is further configured to control the second end of the second switch module to be at a first voltage, and control the second switch module and the third switch module to be in an on state during the first compensation time period and the second compensation time period, so that one end of the first capacitor module is at the first voltage and the other end of the first capacitor module is at a ground voltage; and then control the third switch module to be in an off state, so that the voltage difference between the two ends of the first capacitor module gradually changes to the turn-on voltage of the first switch module. The driving module is further configured to control the second switch module to be in an off state during the first light-emitting period, and to control the control end of the first switch module to obtain the first data voltage; and to control the second switch module to be in an off state during the second light-emitting period, and to control the control end of the first switch module to obtain the second data voltage; The driving module is further configured to control the second switch module to be in an on state during the third light-emitting time period and the fourth light-emitting time period, and to control the voltage at the second end of the second switch module to be a second voltage, so as to place the first switch module in an off state.

2. The pixel circuit according to claim 1, wherein: The driving module includes: a first switching unit; a second switch unit, wherein a first end of the second switch unit is connected to the first end of the first switch unit, and a second end of the second switch unit is connected to the control end of the first switch module; The driving unit is respectively connected to the control end of the first switch unit, the second end of the first switch unit and the control end of the second switch unit, and is used to control the second end of the first switch unit to obtain the first data voltage before the first light-emitting time period, and to put the first switch unit into a conductive state so that the first end of the second switch unit is the first data voltage, and to control the second switch unit to be in a conductive state at the start of the first light-emitting time period so that the control end of the first switch module obtains the first data voltage; the driving unit is also used to control the second end of the first switch unit to obtain the second data voltage before the second light-emitting time period, and to put the first switch unit into a conductive state so that the first end of the second switch unit is the second data voltage, and to control the second switch unit to be in a conductive state at the start of the second light-emitting time period so that the control end of the first switch module obtains the second data voltage.

3. The pixel circuit according to claim 2, wherein: It also includes a second capacitor module, one end of the second capacitor module is connected to the first end of the second switch unit, and the other end of the second capacitor is connected to the first end of the first switch module.

4. A method for driving a pixel circuit, characterized in that: The method comprises: determining a target brightness of the pixel circuit in a target frame period; the pixel circuit includes a light-emitting module, a first switch module, a second switch module, a third switch module, and a first capacitor module, the cathode of the light-emitting module is grounded, a first end of the first switch module is used to connect to a power supply voltage, a second end of the first switch module is connected to an anode of the light-emitting module, a first end of the second switch module is connected to a control end of the first switch module, a first end of the third switch module is connected to the second end of the first switch module, and a second end of the third switch module is grounded; one end of the first capacitor module is connected to the control end of the first switch module, and the other end of the first capacitor module is connected to the second end of the first switch module; the target frame period includes a first sub-frame period and a second sub-frame period, the first sub-frame period includes a first compensation period, a first light-emitting period, and a third light-emitting period, the second sub-frame period also includes a second compensation period, a second light-emitting period, and a fourth light-emitting period, the conduction period of the first switch module in the first sub-frame period is a first light-emitting period, and the conduction period in the second sub-frame period is a second light-emitting period, wherein the duration of the first light-emitting period is less than the duration of the second light-emitting period; determining a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period; During the first compensation time period and the second compensation time period, the second end of the second switch module is controlled to be at a first voltage, and the second switch module and the third switch module are controlled to be in an on state, so that one end of the first capacitor module is at the first voltage and the other end of the first capacitor module is at a ground voltage; then, the third switch module is controlled to be in an off state, so that the voltage difference between the two ends of the first capacitor module gradually changes to the turn-on voltage of the first switch module; During the first light-emitting period, the second switch module is controlled to be in an off state, and the control end of the first switch module is controlled to obtain the first data voltage; during the second light-emitting period, the second switch module is controlled to be in an off state, and the control end of the first switch module is controlled to obtain the second data voltage; In the third light-emitting period and the fourth light-emitting period, the second switch module is controlled to be in an on state, and the voltage at the second end of the second switch module is controlled to be a second voltage, so that the first switch module is in an off state.

5. The driving method according to claim 4, wherein: Determining a first data voltage and a second data voltage according to the target brightness, a first light-emitting period, and a second light-emitting period includes: When the target brightness is less than or equal to a minimum brightness threshold, the second data voltage is determined to be a preset voltage, wherein the preset voltage is less than a minimum threshold voltage.

6. The driving method according to claim 4, wherein: Determining a first data voltage and a second data voltage according to the target brightness, a first light-emitting period, and a second light-emitting period includes: When the target brightness is greater than or equal to a maximum brightness threshold, the first data voltage is determined to be a maximum data voltage.

7. A driving device for a pixel circuit, characterized in that: include: a brightness determination module, configured to determine a target brightness of the pixel circuit in a target frame period; The pixel circuit includes a light-emitting module, a first switch module, a second switch module, a third switch module, and a first capacitor module. The cathode of the light-emitting module is grounded. The first end of the first switch module is used to connect to a power supply voltage. The second end of the first switch module is connected to the anode of the light-emitting module. The first end of the second switch module is connected to the control end of the first switch module. The first end of the third switch module is connected to the second end of the first switch module. The second end of the third switch module is grounded. One end of the first capacitor module is connected to the control end of the first switch module, and the other end of the first capacitor module is connected to the second end of the first switch module. The target frame period includes a first sub-frame period and a second sub-frame period. The first sub-frame period includes a first compensation period, a first light-emitting period, and a third light-emitting period. The second sub-frame period also includes a second compensation period, a second light-emitting period, and a fourth light-emitting period. The first switch module is turned on during the first sub-frame period as a first light-emitting period, and is turned on during the second sub-frame period as a second light-emitting period. The first light-emitting period is shorter than the second light-emitting period. a voltage determination module, configured to determine a first data voltage and a second data voltage according to the target brightness, the first light-emitting period, and the second light-emitting period; a light-emitting control module, configured to control the second end of the second switch module to be at a first voltage, and to control the second switch module and the third switch module to be in an on state during the first compensation time period and the second compensation time period, so that one end of the first capacitor module is at the first voltage and the other end of the first capacitor module is at a ground voltage; and then control the third switch module to be in an off state, so that the voltage difference between the two ends of the first capacitor module gradually changes to the turn-on voltage of the first switch module; the light-emitting control module is further configured to control the second switch module to be in an off state during the first light-emitting period, and to control the control end of the first switch module to obtain the first data voltage; and is further configured to control the second switch module to be in an off state during the second light-emitting period, and to control the control end of the first switch module to obtain the second data voltage; In the third light-emitting period and the fourth light-emitting period, the second switch module is controlled to be in an on state, and the voltage at the second end of the second switch module is controlled to be a second voltage, so that the first switch module is in an off state.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 4 to 6 is implemented.

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