Pixel circuits, display panels and display devices

Abstract

This invention discloses a pixel circuit, a display panel, and a display device. The pixel circuit includes: a light-emitting element, a PAM module, a PWM module, and an auxiliary module. The PAM module includes: a first driving unit for providing a first driving signal to the light-emitting element; a first writing unit for writing a first data signal; a storage unit for storing the first data signal; and a light-emitting control unit for controlling the transmission path of the first driving signal. The PWM module includes: a second driving unit for providing a second driving signal to the first driving unit; a second writing unit for writing the second data signal; a coupling unit for coupling a modulation signal to the second driving unit; and a driving control unit for controlling the transmission path of the second driving signal. The auxiliary module is used to reset the light-emitting element. The operating period of the auxiliary module overlaps with at least one operating phase of the light-emitting control unit, the driving control unit, and the modulation signal. Using the above technical solution, the light emission duration can be accurately controlled.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a pixel circuit, a display panel, and a display device. Background Technology

[0002] A light-emitting diode (LED) display panel is a flat panel display panel that includes multiple LEDs. Compared to liquid crystal display (LCD) panels, which require backlighting, LED display panels can provide better contrast, response time, and energy efficiency.

[0003] When LEDs receive a low driving current, their luminous efficiency is low and low grayscale levels are difficult to distinguish. To improve the display effect of LED display panels, a driving method combining pulse width modulation (PWM) and pulse amplitude modulation (PAM) can be used.

[0004] However, when the control voltage of the PWM module is transmitted to the pixel circuits at different locations within the display panel, the voltage signal is easily distorted due to the voltage drop, causing some pixel circuits to be unable to accurately control the duration of LED illumination, thus affecting the display effect. Summary of the Invention

[0005] The present invention provides a pixel circuit, a display panel, and a display device, so that the pixel circuit can accurately control the light-emitting duration of LEDs and improve the display effect.

[0006] According to one aspect of the present invention, a pixel circuit is provided, comprising: a light-emitting element, a pulse amplitude modulation module, a pulse width modulation module, and an auxiliary module;

[0007] The pulse amplitude modulation module includes a first driving unit, a first writing unit, a storage unit, and a light-emitting control unit; the first driving unit is used to provide a first driving signal to the light-emitting element; the first writing unit is used to write a first data signal to the first driving unit; the storage unit is used to store the first data signal in the first driving unit; and the light-emitting control unit is used to control the transmission path of the first driving unit providing the first driving signal to the light-emitting element.

[0008] The pulse width modulation module includes a second driving unit, a second writing unit, a driving control unit, and a coupling unit; the second driving unit is used to provide a second driving signal to the first driving unit; the second writing unit is used to write a second data signal to the second driving unit; the coupling unit is used to couple the change in the modulation signal to the second driving unit; and the driving control unit is used to control the transmission path of the second driving unit to provide the second driving signal to the first driving unit.

[0009] The auxiliary module is used to reset the light-emitting element; wherein the working period of the auxiliary module overlaps with at least one of the working period of the light-emitting control unit, the working period of the drive control unit, and the modulation phase of the modulation signal.

[0010] According to another aspect of the present invention, a display panel is provided, including the above-described pixel circuit.

[0011] According to another aspect of the present invention, a display device is provided, including the above-described display panel.

[0012] The technical solution of this invention, by setting an auxiliary module that overlaps with at least one of the working periods of the light-emitting control unit, the driving control unit, and the modulation phase of the modulation signal, allows the auxiliary module to reset the light-emitting element when the second driving unit is turned on, controlling the light-emitting element to stop emitting light. This ensures the light-emitting element can promptly enter a black state during the driving phase. This avoids signal distortion received by the pulse width modulation module of pixel circuits far from the display chip, which could prevent the first driving unit from being turned off when the second driving unit is turned on. This would cause the light-emitting element, which should stop emitting light, to continue emitting light and fail to enter a black state in time, affecting the pulse width of the first driving signal and consequently the display grayscale, resulting in display abnormalities. Using the solution of this invention, the light-emitting duration of the light-emitting element can be accurately controlled regardless of whether the pixel circuit is close to or far from the display chip, achieving precise control of the display grayscale and improving the display effect.

[0013] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the circuit structure of a pixel circuit provided in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0017] Figure 3 This is a timing diagram of a pixel circuit provided in an embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0019] Figure 5 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0021] Figure 7 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention;

[0023] Figure 9 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0024] Figure 10 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0025] Figure 11 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0026] Figure 12 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0027] Figure 13 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0028] Figure 14 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention;

[0029] Figure 15 This is a top view structural diagram of a display panel provided in an embodiment of the present invention;

[0030] Figure 16 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0033] As mentioned in the background section, existing LED display panels include multiple pixel circuits. To improve display quality, a PWM module is typically used to control the duration of the drive signal provided by the PAM module to the LEDs. This allows multiple LEDs to display various gray levels within a single frame, especially multiple gray levels within the low gray level range. However, due to signal line voltage drops, the voltage signal received by the PWM module of pixel circuits located far from the display chip becomes distorted. This affects the control signal provided by the PWM module to the PAM module, which in turn affects the duration of the drive signal provided by the PAM module to the LEDs. Consequently, the LEDs cannot emit light accurately or accurately enter a black state, thus affecting the display quality.

[0034] To address the aforementioned technical problems, embodiments of the present invention provide a pixel circuit, comprising: a light-emitting element, a pulse amplitude modulation module, a pulse width modulation module, and an auxiliary module; the pulse amplitude modulation module includes a first driving unit, a first writing unit, a storage unit, and a light-emitting control unit; the first driving unit provides a first driving signal to the light-emitting element; the first writing unit writes a first data signal to the first driving unit; the storage unit stores the first data signal in the first driving unit; the light-emitting control unit controls the transmission path of the first driving unit providing the first driving signal to the light-emitting element; the pulse width modulation module includes a second driving unit, a second writing unit, a driving control unit, and a coupling unit; the second driving unit provides a second driving signal to the first driving unit; the second writing unit writes a second data signal to the second driving unit; the coupling unit couples the change in the modulation signal to the second driving unit; the driving control unit controls the transmission path of the second driving unit providing the second driving signal to the first driving unit; the auxiliary module resets the light-emitting element; wherein the operating period of the auxiliary module overlaps with at least one of the operating period of the light-emitting control unit, the operating period of the driving control unit, and the modulation phase of the modulation signal.

[0035] By employing the above technical solution, and by setting an auxiliary module that overlaps with at least one of the working periods of the light-emitting control unit, the driving control unit, and the modulation phase of the modulation signal, the auxiliary module can reset the light-emitting element when the second driving unit is turned on, controlling the light-emitting element to stop emitting light. This allows the light-emitting element to enter the black state promptly during the driving phase. This avoids signal distortion received by the pulse width modulation module of pixel circuits far from the display chip, which could prevent the first driving unit from being turned off when the second driving unit is turned on. This would cause the light-emitting element, which should have stopped emitting light, to continue emitting light and fail to enter the black state promptly, affecting the pulse width of the first driving signal and consequently affecting the display grayscale, resulting in display abnormalities. Using the solution of this invention, the light-emitting duration of the light-emitting element can be accurately controlled regardless of whether the pixel circuit is close to or far from the display chip, thereby achieving precise control of the display grayscale and improving the display effect.

[0036] The above is the core idea of ​​this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of a pixel circuit structure provided in an embodiment of the present invention, for reference. Figure 1The pixel circuit includes: a light-emitting element LED, a pulse amplitude modulation (PAM) module 100, a pulse width modulation (PWM) module 200, and an auxiliary module 300.

[0038] The PAM module 100 includes a first driving unit 110, a first writing unit 120, a storage unit 130, and a light-emitting control unit 140. The first driving unit 110 is used to provide a first driving signal to the light-emitting element LED. The first writing unit 120 is used to write a first data signal Data1 to the first driving unit 110. The storage unit 130 is used to store the first data signal Data1 in the first driving unit 110. The light-emitting control unit 140 is used to control the transmission path of the first driving unit 110 to provide the first driving signal to the light-emitting element LED.

[0039] The PWM module 200 includes a second drive unit 210, a second write unit 220, a coupling unit 230, and a drive control unit 240. The second drive unit 210 is used to provide a second drive signal to the first drive unit 110. The second write unit 220 is used to write a second data signal Data2 to the second drive unit 210. The coupling unit 230 is used to couple the change of the modulation signal Sweep to the second drive unit 210. The drive control unit 240 is used to control the second drive unit 210 to provide a transmission path for the second drive signal to the first drive unit 110.

[0040] The auxiliary module 300 is used to reset the light-emitting element LED, wherein the working period of the auxiliary module 300 overlaps with at least one of the working periods of the light-emitting control unit 140, the working period of the drive control unit 240, and the modulation phase of the modulation signal Sweep.

[0041] For example, continue to refer to Figure 1 The first terminal of the first driving unit 110 receives the first power signal VDD1, and the second terminal of the first driving unit 110 is electrically connected to the light-emitting control unit 140. The control terminal of the first driving unit 110 is electrically connected to the second terminal of the first writing unit 120 at the first node N1. The first terminal of the first writing unit 120 receives the first data signal Data1, and the control terminal of the first writing unit 120 receives the first writing control signal Scan12. One terminal of the storage unit 130 is electrically connected to the first node N1, and the other terminal receives the first power signal VDD1. The control terminal of the light-emitting control unit 140 can receive the light-emitting control signal Emit1, and the second terminal of the light-emitting control unit 140 is electrically connected to the first electrode of the light-emitting element LED. The second electrode of the light-emitting element LED receives the second power signal PVEE.

[0042] The first end of the second drive unit 210 receives the third power signal VDD2, and the second end is electrically connected to the drive control unit 240. The control end is electrically connected to the second end of the second write unit 220 at the second node N2. The first end of the second write unit 220 receives the second data signal Data2, and the control end of the second write unit 220 receives the second write control signal Scan22. One end of the coupling unit 230 is electrically connected to the second node N2, and the other end receives the modulation signal Sweep. The control end of the drive control unit 240 can receive the drive control signal Emit2, and the second end of the drive control unit 240 is electrically connected to the first node N1.

[0043] The first terminal of the auxiliary module 300 receives an auxiliary reset signal RST, the second terminal of the auxiliary module 300 is electrically connected to the first electrode of the light-emitting element LED, and the control terminal of the auxiliary module 300 receives an auxiliary control signal Scan3. In one optional embodiment, the first electrode of the light-emitting element LED is the anode of the light-emitting element LED, in which case the voltage of the auxiliary reset signal RST can be less than or equal to the voltage of the second power supply signal PVEE; in another optional embodiment, the first electrode of the light-emitting element LED is the cathode of the light-emitting element LED, in which case the voltage of the auxiliary reset signal RST can be greater than or equal to the voltage of the second power supply signal PVEE. When the voltage of the auxiliary reset signal RST is equal to the voltage of the second power supply signal PVEE, the auxiliary reset signal RST can reuse the second power supply signal PVEE.

[0044] In other alternative implementations, Figure 2 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 2The PAM module 100 may further include a first compensation unit 150. The first end of the first compensation unit 150 may be electrically connected to the second end of the first driving unit 110. The second end of the first compensation unit 150 is electrically connected to the control end of the first driving unit 110 at the first node N1. At this time, the second end of the first writing unit 120 is electrically connected to the first end of the first driving unit 110. During at least a part of the time period, the first compensation unit 150 and the first writing unit 120 work simultaneously. In one embodiment, the control end of the first compensation unit 150 may receive the first writing control signal Scan12. And / or, the PWM module 200 may further include a second compensation unit 250, the first end of which may be electrically connected to the second end of the second drive unit 210, and the second end of the second compensation unit 250 and the control end of the second drive unit 210 are electrically connected to the second node N2. At this time, the second end of the second write unit 220 is electrically connected to the first end of the second drive unit 210. During at least a portion of the time, the second compensation unit 250 and the second write unit 220 work simultaneously. In one embodiment, the control end of the second compensation unit 250 may receive the second write control signal Scan 22.

[0045] Taking the case where all control signals are at a low effective level as an example, Figure 3 This is a timing diagram of a pixel circuit provided in an embodiment of the present invention, for reference. Figure 3 The driving cycle of the pixel circuit includes a write phase (TS) and a drive phase (TD). It should be noted that the effective level of the control signal can be either high or low; this embodiment of the invention does not limit this. For ease of description, this embodiment will use a low effective level control signal as an example to illustrate the technical solution of the present invention.

[0046] The write phase TS includes a working period t12 of the first write unit 120 and a working period t22 of the second write unit 220. During the working period t12 of the first write unit 120, the first write unit 120 can write a first data signal Data1 to the first node N1; during the working period t22 of the second write unit 220, the second write unit 220 can write a second data signal Data2 to the second node N2. During the write phase TS, the storage unit 130 can store the first data signal Data1 written by the first node N1, and the coupling unit 230 can store the second data signal Data2 written by the second node N2.

[0047] The driving phase TD includes the working period t3 of the auxiliary module 300, the working period te1 of the light-emitting control unit 140, the working period te2 of the driving control unit 240, and the modulation phase tm of the modulation signal Sweep. During the working period t3 of the auxiliary module 300, the auxiliary module 300 can transmit the auxiliary reset signal RST to the first electrode of the light-emitting element LED to reset the light-emitting element LED and make the light-emitting element LED enter the black state.

[0048] During the working period te1 of the light-emitting control unit 140, the light-emitting control unit 140 can control the transmission path of the first driving unit 110 to provide the first driving signal to the light-emitting element LED to be turned on; during at least part of the working period te1 of the light-emitting control unit 140, the first driving unit 110 can generate a driving current of a corresponding magnitude according to the first data signal Data1 and provide it to the light-emitting element LED, so that the light-emitting element LED can emit light of a corresponding brightness according to the first data signal Data1.

[0049] During the operating period te2 of the drive control unit 240, the drive control unit 240 can control the second drive unit 210 to provide the transmission path for the second drive signal to the first drive unit 110. During the modulation phase tm of the modulation signal Sweep, the modulation signal Sweep changes, and the coupling unit 230 also couples the change in the modulation signal Sweep to the second node N2. Based on the second data signal Data2 written to the second node N2 and the change in the modulation signal Sweep coupled to the second node N2, the operating state of the second drive unit 210 can be controlled. During at least a portion of the operating period te2 of the drive control unit 240, the second drive unit 210 is turned on, and can provide the third power signal VDD2 to the first node N1, causing the first drive unit 110 to stop providing drive current to the light-emitting element LED, and the light-emitting element LED enters a black state.

[0050] As described above, in addition to the control signal, the PAM module 100 can receive the first data signal Data1 and the first power signal VDD1, and control the amplitude of the driving current supplied to the light-emitting element LED according to the first data signal Data1 and the first power signal VDD1; in addition to the control signal, the PWM module 200 can receive the second data signal Data2, the modulation signal Sweep and the third power signal VDD2, and control the time when the third power signal VDD2 is supplied to the PAM module 100 according to the second data signal Data2 and the modulation signal Sweep, thereby controlling the pulse width of the driving current supplied by the PAM module 100 to the light-emitting element LED.

[0051] By determining the amplitude and pulse width of the driving current, the display grayscale of the LED can be determined. Due to the influence of the signal line voltage drop, one or more of the second data signal Data2, the modulation signal Sweep, and the third power signal VDD2 received by the PWM module 200 may be distorted, affecting the pulse width of the driving current provided to the LED by the control PAM module 100. However, when the pulse width of the driving current is inaccurate due to signal distortion, the auxiliary module 300 can ensure that the LED can still enter the black state in time, ensuring that the LED can be displayed with accurate grayscale and improving the display effect.

[0052] In this embodiment of the invention, by setting an auxiliary module that overlaps with at least one of the working periods of the light-emitting control unit, the driving control unit, and the modulation phase of the modulation signal, the auxiliary module can reset the light-emitting element when the second driving unit is turned on, controlling the light-emitting element to stop emitting light. This allows the light-emitting element to enter a black state promptly during the driving phase. This avoids signal distortion received by the pulse width modulation module of pixel circuits far from the display chip, which could prevent the first driving unit from being turned off when the second driving unit is turned on. This would cause the light-emitting element, which should have stopped emitting light, to continue emitting light and fail to enter a black state promptly, affecting the pulse width of the first driving signal and consequently the display grayscale, resulting in display abnormalities. Using the solution of this invention, the light-emitting duration of the light-emitting element can be accurately controlled regardless of whether the pixel circuit is close to or far from the display chip, achieving precise control of the display grayscale and improving the display effect.

[0053] Optional, Figure 4 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 The PAM module 100 also includes a reset unit 160, which is also used to reset the device. At least part of the working period of the reset unit 160 does not overlap with the working period of the light-emitting control unit 140, the working period of the drive control unit 240, and the modulation phase of the modulation signal Sweep.

[0054] For example, continue to refer to Figure 4 The first terminal of the reset unit 160 receives the reset signal Vref3, the second terminal of the reset unit 160 is electrically connected to the first electrode of the light-emitting element LED, and the control terminal of the reset unit 160 receives the reset control signal Scan1.

[0055] Taking the case where all control signals are at a low effective level as an example, Figure 5 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 5The driving cycle of the pixel circuit also includes a reset phase TR. The reset phase TR includes the working period t1 of the reset unit 160, at least a portion of which is located before and / or after the driving phase TD. During the working period t1 of the reset unit 160, the reset unit 160 can transmit a reset signal Vref3 to the first electrode of the light-emitting element LED to reset the light-emitting element LED, thereby clearing the electrical signal of the light-emitting element LED in the current driving cycle or the previous driving cycle, which helps to improve the accuracy of the light-emitting brightness of the light-emitting element LED.

[0056] In one optional embodiment, the first electrode of the LED is the anode of the LED. In this case, the voltage of the reset signal Vref3 can be less than the voltage of the second power supply signal PVEE, which is beneficial for clearing the electrical signal of the anode of the LED. In yet another optional embodiment, the first electrode of the LED is the cathode of the LED. In this case, the voltage of the reset signal Vref3 can be greater than the voltage of the second power supply signal PVEE, which is beneficial for clearing the electrical signal of the anode of the LED. In a feasible embodiment, the reset signal Vref3 can reuse the auxiliary reset signal RST received by the auxiliary module 300.

[0057] Optional, continue to refer to Figure 4 and Figure 5 The PAM module 100 further includes a first initialization unit 170, which is used to initialize the first drive unit 110; and / or, the PWM module 200 further includes a second initialization unit 270, which is used to initialize the second drive unit 210. The working period t1 of the reset unit 160 is the same as the working period of the first initialization unit 170 and / or the second initialization unit 270, and the working period t1 of the reset unit 160 does not overlap with the working period t3 of the auxiliary module 300.

[0058] For example, continue to refer to Figure 4The first initialization unit 170 receives a first initialization signal Vref1 at its first terminal, and its second terminal is electrically connected to the control terminal of the first driving unit 110 at the first node N1. The control terminal of the first initialization unit 170 receives a reset control signal Scan1. Alternatively, the second initialization unit 270 receives a second initialization signal Vref2 at its first terminal, and its second terminal is electrically connected to the control terminal of the second driving unit 210 at the second node N2. The control terminal of the second initialization unit 270 also receives a reset control signal Scan1. The driving cycle of the pixel circuit also includes an initialization phase TI, which includes the working time of the first initialization unit 170 and / or the second initialization unit 270. When the control terminals of the first initialization unit 170 and / or the second initialization unit 270, like the control terminal of the reset unit 160, also receive the reset control signal Scan1, the initialization phase TI and the reset phase TR at least partially overlap. The working time of the first initialization unit 170 and / or the second initialization unit 270 is the same as the working time t1 of the reset unit 160.

[0059] Taking the example that the control terminals of the first initialization unit 170 and / or the second initialization unit 270 both receive the reset control signal Scan1, at least a portion of the working period t1 of the reset unit 160 is located before the write phase TS. Before the write phase TS, the first initialization unit 170 can transmit the first initialization signal Vref1 to the first node N1 to initialize the control terminal of the first drive unit 110, thereby clearing the electrical signal of the control terminal of the first drive unit 110 in the previous drive cycle, so that the first drive unit 110 reaches the initial state, so as to facilitate the writing of the first data signal Data1 in the next phase; and / or, before the write phase TS, the second initialization unit 270 can transmit the second initialization signal Vref2 to the second node N2 to initialize the control terminal of the second drive unit 210, thereby clearing the electrical signal of the control terminal of the second drive unit 210 in the previous drive cycle, so as to facilitate the writing of the second data signal Data2 in the next phase.

[0060] In other optional embodiments, the control terminals of the first initialization unit 170 and / or the second initialization unit 270 may also receive an initialization control signal (not shown in the figure). The operating time periods of the first initialization unit 170 and / or the second initialization unit 270 and the operating time period t1 of the reset unit 160 may not overlap. In this case, the initialization phase TI and the reset phase TR of the pixel circuit may also not overlap. In the same driving cycle, the initialization phase TI is located before the write phase TS. During the initialization phase TI, the initialization control signal jumps to an active level, and the control terminals of the first driving unit 110 and / or the second initialization unit 270 are initialized. Wherein, when the operating time period t1 of the reset unit 160 and the initialization phase TI do not overlap, the operating time period t1 of the reset unit 160 may not be located before the write phase TS.

[0061] In an alternative embodiment, reference continues. Figure 4 The PAM module 100 includes at least seven transistors and one capacitor (M1, M2, M3, M4, M5, M6, M7, C1), the PWM module includes at least six transistors and one capacitor (M8, M9, M10, M11, M12, M13, C2), and the auxiliary module 300 includes at least one transistor (M14).

[0062] In one optional embodiment, the first driving unit 110 includes a first driving transistor M3, and a first initialization signal Vref1 can control the first driving transistor M3 to turn on. The absolute value of the first initialization signal Vref1 is greater than the absolute value of the threshold voltage of the first driving transistor M3. In another optional embodiment, the second driving unit 210 includes a second driving transistor M10, and a second initialization signal Vref2 can control the second driving transistor M10 to turn on. The absolute value of the second initialization signal Vref2 is greater than the absolute value of the threshold voltage of the second driving transistor M10. In a feasible embodiment, the first initialization signal Vref1 can reuse the reset signal Vref3 received by the reset module 160 and / or the auxiliary reset signal RST received by the auxiliary module 300, and the second initialization signal Vref2 can reuse the reset signal Vref3 received by the reset module 160 and / or the auxiliary reset signal RST received by the auxiliary module 300.

[0063] Based on the above embodiments, continue to refer to Figure 4 and Figure 5 The auxiliary module 300 and the reset unit 160 are two independent structures. For example, the auxiliary module 300 may include an auxiliary transistor M14, and the reset unit 160 may include a reset transistor M7. The working period t1 of the reset module 160 and the working period t3 of the auxiliary module 300 do not overlap.

[0064] For example, the working period t1 of the reset unit 160 is located before the driving phase TD, and the working period t3 of the auxiliary module 300 is located within the driving phase TD. The driving cycle of the pixel circuit includes only one working period t1 of the reset unit 160, and the driving cycle of the pixel circuit also includes only one working period t3 of the auxiliary module 300. This ensures that in the driving cycle of the pixel circuit, the reset control signal Scan1 has exactly one valid pulse, and in the driving cycle of the pixel circuit, the auxiliary control signal Scan3 also has exactly one valid pulse. This simplifies timing design, reduces development costs, and avoids setting multiple valid pulses of the control signal in one driving cycle, shortening the effective duration of the valid pulse, which is detrimental to signal transmission.

[0065] In yet another alternative embodiment, Figure 6 This is a schematic diagram of another pixel circuit structure provided in an embodiment of the present invention. Figure 7 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 6 and Figure 7 The auxiliary module 300 is reused as the reset unit 160. For example, the auxiliary transistor M14 can be reused as the reset transistor M7. The working period of the reset module 160 is the same as the working period t3 of the auxiliary module 300. At this time, the effective period of the effective pulse of the reset control signal Scan1 is the working period t0 of the first initialization unit 170 and / or the second initialization unit 20.

[0066] Continue to refer to Figure 6 and Figure 7 The working period t3 of the auxiliary module 300 includes a first working period t31 and a second working period t32. The first working period t31 does not overlap with the working period te1 of the light-emitting control unit 140, the working period te2 of the drive control unit 240, and the modulation phase tm of the modulation signal Sweep. The second working period t32 overlaps with at least one part of the working period te1 of the light-emitting control unit 140, the working period te2 of the drive control unit 240, and the modulation phase tm of the modulation signal Sweep.

[0067] For example, refer to Figure 6 and Figure 7During the first operating period t31, the auxiliary module 300 transmits an auxiliary reset signal RST to the first electrode of the LED to reset the LED, clearing the electrical signal of the LED in the current or previous driving cycle, which helps improve the accuracy of the LED's brightness. During the second operating period t32, the auxiliary module 300 transmits the auxiliary reset signal RST to the first electrode of the LED to reset the LED, causing the LED to enter a black state. By multiplexing the reset unit 160 and the auxiliary module 300, the hardware structure of the pixel circuit can be reduced, for example, the number of transistors in the pixel circuit can be reduced, which helps to reduce the space occupied by the pixel circuit and improve the resolution.

[0068] Optional, Figure 8 This is a schematic diagram of the circuit structure of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 8 The second driving unit 210 includes a second driving transistor M10. The first terminal of the second driving transistor M10 receives a third power supply signal VDD2. The second terminal of the second driving transistor M10 is electrically connected to the first driving unit 110. The gate of the second driving transistor M10 is electrically connected to the coupling unit 230. The auxiliary module 300 includes an auxiliary transistor M14. The first terminal of the auxiliary transistor M14 receives an auxiliary reset signal. The second terminal of the auxiliary transistor M14 is electrically connected to the light-emitting element LED. The gate of the auxiliary transistor M14 is electrically connected to the gate of the second driving transistor M10.

[0069] For example, the second driving transistor M10 and the auxiliary transistor M14 are of the same transistor type; for instance, both the second driving transistor M10 and the auxiliary transistor M14 may be P-type transistors. Assume the first driving unit 110 includes a first driving transistor M3. The first terminal of the first driving transistor M3 receives the first power supply signal VDD1. The second terminal of the first driving transistor M3 can be electrically connected to the second terminal of the auxiliary transistor M14. The gate of the first driving transistor M3 can be electrically connected to the second terminal of the second driving transistor M10. The first driving transistor M3 is also a P-type transistor. When the voltage difference between the gate potential of the second driving transistor M10 and the third power supply signal VDD2 is less than or equal to the threshold voltage Vth(M10) (negative value) of the second driving transistor M10, the second driving transistor M10 is turned on. At this time, the gate potential of the first driving transistor M3 is the third power supply signal VDD2. The voltage difference between the gate potential of the first driving transistor M3 and the first power supply signal VDD1 is greater than the threshold voltage Vth(M3) (negative value) of the first driving transistor M3, the first driving transistor M3 is turned off, and the light-emitting element LED can be controlled to stop emitting light. Therefore, VDD2-VDD1>Vth(M3), that is, VDD2+|Vth(M3)|>VDD1.

[0070] In the conventional configuration, the absolute values ​​of the threshold voltages Vth(M10)| of the second driving transistor M10 and the first driving transistor M3 are both relatively large, while the absolute values ​​of the threshold voltages of other transistors are relatively small. For example, the absolute value of the threshold voltage Vth(M14)| of the auxiliary transistor M14 is relatively small. Therefore, in this embodiment of the invention, the voltage of the first power supply signal VDD1 can be set to be less than the voltage of the third power supply signal VDD2. The gate potential of the second driving transistor M10 is equal to the gate potential of the auxiliary transistor M14. When the second driving transistor M10 is in the critical conduction state, the voltage difference between the gate potential of the second driving transistor M10 and the third power supply signal VDD2 is equal to the threshold voltage Vth(M10) of the second driving transistor M10 (negative value). At this time, the voltage difference between the gate potential of the auxiliary transistor M14 and the first power supply signal VDD1 can also be equal to the threshold voltage Vth(M14) of the auxiliary transistor M14 (negative value), so that the auxiliary transistor M14 and the second driving transistor M10 can be turned on at the same time. On the one hand, when the second driving transistor M10 is turned on, the auxiliary transistor M14 can control the light-emitting element LED to enter the black state in a timely manner. This avoids the distortion of the third power supply signal VDD2 provided by the second driving transistor M10 to the first driving transistor M3 when the second driving transistor M10 is turned on, which would prevent the first driving transistor M3 from being turned off in time and affect the light-emitting duration of the light-emitting element LED. On the other hand, there is no need to design separate control signals and control signal lines for the auxiliary transistor M14, which helps to reduce signal routing, simplify timing design, and also avoids the working period of the auxiliary module 300 being inconsistent with the working period of the second driving unit 210, which would affect the display grayscale.

[0071] In an optional embodiment, the voltage of the first power signal VDD1 is less than the voltage of the third power signal VDD2; the voltage of the first power signal VDD1 is equal to the voltage of the third power signal VDD2 minus a preset compensation value.

[0072] In one embodiment, the preset compensation value can be the absolute value of the threshold voltage Vth(M10)| of the second driving transistor M10, for example, the average or median of the absolute values ​​of the threshold voltages Vth(M10)| of multiple auxiliary transistors M10 can be tested or calculated as the preset compensation value. Thus, when the second driving transistor M10 is in the critical conduction state, the voltage VN2 of the second node N2 is VDD2-|Vth(M10)|, the gate-source voltage VGS(M14) of the auxiliary transistor M14 is VN2-VDD1=0, and the auxiliary transistor M14 is also in the critical conduction state, which allows the auxiliary transistor M14 and the second driving transistor M10 to conduct simultaneously (the absolute value of the threshold voltage Vth(M14)| of the auxiliary transistor M14 is small and can be ignored).

[0073] In another embodiment, the preset compensation value can be the absolute value of the threshold voltage Vth(M10)| of the second driving transistor M10 minus the absolute value of the threshold voltage Vth(M14)| of the auxiliary transistor M14. Thus, when the second driving transistor M10 is in a critical conduction state, the voltage VN2 of the second node N2 = VDD2 - |Vth(M10)|, and the gate-source voltage VGS(M14) of the auxiliary transistor M14 = VN2 - VDD1 = -|Vth(M14)|. The auxiliary transistor M14 is also in a critical conduction state, allowing the auxiliary transistor M14 and the second driving transistor M10 to conduct simultaneously (the threshold voltage Vth(M14) of the auxiliary transistor M14 is not ignored).

[0074] Optional, Figure 9 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 9 The driving cycle of the pixel circuit includes at least a write phase TS and a driving phase TD; the working time period t21 of the first write unit 120 and the working time period t22 of the second write unit 220 both overlap with the write phase TS; the working time period te1 of the light-emitting control unit 140, the working time period te2 of the driving control unit 240, and the modulation phase tm of the modulation signal Sweep overlap simultaneously in at least a portion of the driving phase TD. The driving phase TD includes a first driving phase td1 and a second driving phase td2; in the first driving phase td1, the light-emitting element LED emits light; in the second driving phase td2, the light-emitting element LED stops emitting light; the second driving phase td2 of the same driving phase TD is located after the first driving phase td1; the working time period t3 of the auxiliary module 300 overlaps with the second driving phase td2; the working time period t3 of the auxiliary module 300 does not overlap with the first driving phase td1.

[0075] For example, the driving phase TD includes the working period t3 of the auxiliary module 300, the working period te1 of the light-emitting control unit 140, the working period te2 of the driving control unit 240, and the modulation phase tm of the modulation signal Sweep. The first driving phase td1 includes a portion of the working period te1 of the light-emitting control unit 140. In the first driving phase td1, the light-emitting control unit 140 of the PAM module 100 can control the first driving unit 110 to provide the transmission path of the first driving signal to the light-emitting element LED. The first driving unit 110 can generate a driving current of a corresponding magnitude according to the first data signal Data1 and provide it to the light-emitting element LED, so that the light-emitting element LED can emit light of a corresponding brightness according to the first data signal Data1.

[0076] The first driving phase td1 may also include a portion of the working period te2 of the driving control unit 240 and a portion of the modulation phase tm of the modulation signal Sweep. In the first driving phase td1, the driving control unit 240 can control the second driving unit 210 to provide the transmission path of the third power signal VDD2 to the first driving unit 110, and the modulation signal Sweep changes. Taking the second driving unit 210 as including the second driving transistor M10, and the second driving transistor M10 being a P-type transistor, the voltage of the modulation signal Sweep in this phase is greater than the voltage of the modulation signal Sweep before this phase, and the voltage of the modulation signal Sweep is relatively large in this phase. The coupling unit 230 will also couple the potential of the second node N2 to a higher potential, so that the second driving transistor M10 is turned off, the third power signal VDD2 is not transmitted to the first node N1, and the first driving unit 110 can provide driving current to the light-emitting element LED, so that the light-emitting element LED can emit light of corresponding brightness according to the first data signal Data1. The first driving phase td1 and the working period t3 of the auxiliary module 300 do not overlap, so as to ensure that when the voltage of the modulation signal Sweep is large and the second driving transistor M10 is turned off, the auxiliary module 300 will not control the light-emitting element LED to enter the black state in advance, thus affecting the grayscale display.

[0077] The second driving phase td2 includes a portion of the working period te2 of the drive control unit 240 and a portion of the modulation phase tm of the modulation signal Sweep. In the second driving phase td2, the drive control unit 240 can control the second driving unit 210 to provide the transmission path of the third power signal VDD2 to the first driving unit 110. Taking the second driving unit 210 as including the second driving transistor M10, and the second driving transistor M10 being a P-type transistor, as an example, the voltage of the modulation signal Sweep in this phase is lower than the voltage of the modulation signal Sweep in the first driving phase td1. In this phase, the voltage of the modulation signal Sweep is relatively small, and the coupling unit 230 will couple the potential of the second node N2 low, causing the second driving transistor M10 to conduct. The third power signal VDD2 is transmitted to the first node N1, the first driving unit 110 stops providing driving current to the light-emitting element LED, and the light-emitting element LED stops emitting light.

[0078] The second driving phase td2 also includes at least a portion of the working period t3 of the auxiliary module 300 to ensure that when the voltage of the modulation signal Sweep is low and the second driving transistor M10 is turned on, the auxiliary module 300 can control the light-emitting element LED to enter the black state in time, so as to avoid the distortion of the third power supply signal VDD2, which would cause the first driving unit 110 to fail to stop providing driving current in time when the second driving transistor M10 is turned on, causing the light-emitting element LED, which should have entered the black state, to continue to emit light, affecting the grayscale display.

[0079] Furthermore, the second driving phase td2 may also include a portion of the operating period te1 of the light-emitting control unit 140. After coupling by the coupling unit 230, whether the second driving transistor M10 can be turned on depends on the voltage of the second data signal Data2 written by the second node N2 during the operating period t22 of the second writing unit 220 and the change in the voltage of the modulation signal Sweep during the modulation phase tm of the modulation signal Sweep. Therefore, the duration for which the second driving transistor M10 is turned on and the first driving unit 110 stops providing driving current to the light-emitting element LED can be determined by the voltage of the second data signal Data2. The second driving phase td2 includes a portion of the working period te1 of the light-emitting control unit 140. In different driving cycles, the voltage of the second data signal Data2 can be controlled to transform a portion of the second driving phase td2 into the first driving period td2, increasing the light-emitting duration of the LED. Similarly, the voltage of the second data signal Data2 can be controlled to transform a portion of the first driving phase td1 into the second driving period td2, shortening the light-emitting duration of the LED. This allows for flexible adjustment of the LED's light-emitting duration, thereby flexibly controlling the display grayscale. Regardless of how the first driving phase td1 and the second driving period td2 change, the first driving phase td1 does not overlap with the working period t3 of the auxiliary module 300.

[0080] It should be noted that the voltage of the modulation signal can, as shown in the attached figure, first jump to a higher potential and then gradually decrease until it returns to the potential before the jump. In other embodiments, the voltage of the modulation signal can also first jump to a lower potential and then gradually increase until it returns to the potential before the jump, or first gradually increase and then jump to the potential before the change, or first gradually decrease and then jump to the potential before the change. The modulation waveform of the modulation signal can be set according to actual needs, and the embodiments of the present invention do not specifically limit it in this regard.

[0081] It should also be noted that the driving cycle of the pixel circuit includes, but is not limited to, the write phase and the drive phase. In other embodiments, the driving cycle of the pixel circuit may also include an initialization phase, a reset phase, etc. The contents of the initialization phase and the reset phase have been described by example above and will not be described in detail here.

[0082] In an optional embodiment, the overlap duration between the working period t3 of the auxiliary module 300 and the driving phase TD is the duration of the second driving phase td2.

[0083] Specifically, during the working period t3 of the auxiliary module 300, the LED is in a black state and does not emit light. The proportion of the working period t3 of the auxiliary module 300 within the driving stage TD is the duration of the LED being in a black state after the first driving stage td1, which is the duration of the second driving stage td2. Thus, by setting the overlap duration between the working period t3 of the auxiliary module 300 and the driving stage TD, the duration of the second driving stage td2 can be set, thereby determining the duration of the first driving stage td1 and achieving precise control over the light-emitting duration of the LED.

[0084] Based on the above embodiments, the proportion of the second driving stage td2 in the driving stage TD is less than or equal to 70%. Thus, the proportion of the duration of the first driving stage td1 in the driving stage TD can be greater than or equal to 30%, allowing the light-emitting element LED sufficient charging and discharging time. This avoids the light-emitting element LED being in the bright state for too short a time, which would affect the precise control of the light-emitting duration of the light-emitting element LED.

[0085] In yet another alternative embodiment, reference continues to... Figure 4 and Figure 9 The second driving unit 210 includes a second driving transistor M10. The first terminal of the second driving transistor M10 receives a third power supply signal VDD2, the second terminal of the second driving transistor M10 is electrically connected to the first driving unit 110, and the gate of the second driving transistor M10 is electrically connected to the coupling unit 230. The voltage of the third power supply signal VDD2 is V2; the voltage of the second data signal Data is Vdata2; during the modulation phase tm, the voltage of the modulation signal Sweep changes linearly with a slope of k; at the switching time between the first driving phase td1 and the second driving phase td2, compared with the non-modulation phase, the voltage change of the modulation signal Sweep is ΔV = |V2 - Vdata2|; the overlap time between the working period t3 of the auxiliary module 300 and the modulation phase tm is ΔV / k.

[0086] For example, taking the second driving transistor M10 as a P-type transistor, when the voltage of the modulation signal Sweep increases significantly compared to the non-modulation stage, the second driving transistor M10 can remain off, allowing the first driving unit 110 to continue providing driving current to the LED. When the voltage of the modulation signal Sweep increases only slightly compared to the non-modulation stage, the gate-source voltage VGS(M10) = VN2 - V2 = [Vdata2 - |Vth(M10)| + ΔV] - V2 of the second driving transistor M10 may be less than or equal to -|Vth(M10)|, and the second driving transistor M10 turns on, causing the first driving unit 110 to stop providing driving current to the LED. When ΔV = V2 - Vdata2, the second driving transistor M10 is in a critical on-state, and the duration from the moment the second driving transistor M10 is in a critical on-state to the end of the modulation stage tm is ΔV / k.

[0087] By setting the overlap duration of the working period t3 of the auxiliary module 300 and the modulation stage tm to ΔV / k, the moment when the auxiliary module 300 controls the light-emitting element LED to enter the black state can change with the change of Vdata2. That is, the working period t3 of the auxiliary module 300 can change with the change of the switching time between the bright state and the black state. This can ensure that the auxiliary module 300 can flexibly and accurately control the light-emitting duration of the LED according to the second data signal Data, and avoid the auxiliary module 300 controlling the light-emitting element LED to enter the black state in advance or lag, which would affect the display grayscale.

[0088] Optional, Figure 10 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 10 The termination time of the driving phase TD overlaps with the working period t3 of the auxiliary module 300.

[0089] For example, the driving phase TD includes the operating period te1 of the light emission control unit 140, the operating period te2 of the driving control unit 240, and the modulation phase tm of the modulation signal Sweep. In the same driving cycle, the end time of the operating period t3 of the auxiliary module 300 may overlap with the end time of the driving phase TD, or the end time of the operating period t3 of the auxiliary module 300 may be located after the end time of the driving phase TD; wherein, the end time of the operating period t3 of the auxiliary module 300 may be located before the next driving cycle, or it may be located before the first driving period td1 of the next cycle.

[0090] In this way, the end time of the working period t3 of the auxiliary module 300 can be located after the end time of the working period te1 of the light-emitting control unit 140. This ensures that before the end time of the working period te1 of the light-emitting control unit 140, the auxiliary module 300 can keep the light-emitting element LED in a black state. This avoids the first driving transistor M3 being turned on due to the distortion of the third power signal VDD after the end time of the working period t3 of the auxiliary module 300, which would cause the light-emitting element LED, which should be in a black state, to emit light and affect the display grayscale.

[0091] Optional, Figure 11 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 11 The termination time of the modulation phase tm of the modulation signal Sweep overlaps with the working period te1 of the light emission control unit 140; and / or, the termination time of the modulation phase tm of the modulation signal Sweep overlaps with the working period te2 of the drive control unit 240.

[0092] For example, the end time of the modulation phase tm of the modulation signal Sweep overlaps with the end time of the working period te1 and / or the working period te2, or the end time of the modulation phase tm of the modulation signal Sweep is before the end time of the working period te1 and / or the working period te2. This ensures that when the second driving transistor M10 is turned on near the end time of the modulation phase tm, the third power supply signal VDD2 can be transmitted to the first node N1 via the second driving transistor M10 and the driving control unit 240, allowing the light-emitting element LED to enter the black state of the driving phase TD; avoiding the inability to control the LED to enter the black state when the second driving transistor M10 is turned on near the end time of the modulation phase tm, which would be detrimental to precise grayscale control.

[0093] Optional, Figure 12 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 12 The end time of the working period te2 of the drive control unit 240 overlaps with the working period te1 of the light-emitting control unit 140.

[0094] For example, the end time of the operating period te2 of the drive control unit 240 overlaps with the end time of the operating period te1 of the light-emitting control unit 140, or the end time of the operating period te2 of the drive control unit 240 is before the end time of the operating period te1 of the light-emitting control unit 140. After the end time of the operating period te1, the first drive unit 110 stops providing drive current to the light-emitting element LED, and the light-emitting element LED enters the black state. The overlap of the end time of the operating period te2 with the operating period te1 ensures that the second drive unit 210 and the drive control unit 240 can also stop transmitting the third power signal VDD2 to the first drive unit 110 after the first drive unit 110 stops providing drive current to the light-emitting element LED. This reduces the leakage current of the first drive unit 110 and the light-emitting control unit 140, and prevents the leakage current from affecting the black state of the light-emitting element LED.

[0095] Optional, Figure 13 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 13 The start time of the working period te1 of the light-emitting control unit 140 overlaps with the modulation phase tm of the modulation signal Sweep; and / or, the start time of the working period te2 of the drive control unit 240 overlaps with the working period te1 of the light-emitting control unit 140.

[0096] For example, taking the second driving unit 210 as including the second driving transistor M10, which is a P-type transistor, at the beginning of the modulation stage tm of the modulation signal Sweep, the voltage of the modulation signal Sweep jumps to a higher level in a short time. The coupling unit 230 can couple the voltage of the second node N2 to a higher level and control the second driving transistor M10 not to turn on. At this time, the second driving transistor M10 does not provide the third power signal VDD2 to the first driving unit 110.

[0097] The start time of the working period te1 of the light-emitting control unit 140 is after the start time of the modulation phase tm of the modulation signal Sweep. This ensures that in the early stage of the working period te1 of the light-emitting control unit 140, the voltage of the second node N2 has been coupled to a higher level by the coupling unit 230, and the second driving transistor M10 is turned off, preventing the third power signal VDD2 from being transmitted to the first driving unit 110. And / or, the start time of the working period te2 of the driving control unit 240 is after the start time of the working period te1 of the light-emitting control unit 140. This ensures that in the early stage of the working period te1 of the light-emitting control unit 140, the driving control unit 240 is not in the working period te2. This also prevents the third power signal VDD2 from being transmitted to the first driving unit 110 in the early stage of the working period te1 of the light-emitting control unit 140, affecting the accuracy of the first data signal Data1 stored in the first node N1, and thus affecting the brightness of the light-emitting element LED.

[0098] Optional, Figure 14 This is a timing diagram of another pixel circuit provided in an embodiment of the present invention, for reference. Figure 4 and Figure 14 The start time of the working period te1 of the drive control unit 240 overlaps with the modulation phase tm of the modulation signal Sweep.

[0099] For example, taking the second driving unit 210 as including a second driving transistor M10, where the second driving transistor M10 is a P-type transistor, at the start of the modulation phase tm of the modulation signal Sweep, the voltage of the modulation signal Sweep jumps to a higher level in a short time. The start time of the modulation phase tm of the modulation signal Sweep is located before the start time of the working period te1 of the driving control unit 240, to ensure that when the driving control unit 240 controls the second driving transistor M10 to provide the transmission path of the third power signal VDD2 to the first driving unit 110, the voltage of the second node N2 has been coupled to a higher level by the coupling unit 230, and the second driving transistor M10 can be in the off state. This prevents the third power signal VDD2 from being transmitted to the first driving unit 110 at the beginning of the working period te1 of the driving control unit 240, which would affect the accuracy of the first data signal Data1 stored in the first node N1, and thus affect the luminous brightness of the light-emitting element LED.

[0100] Specifically, when the start time of the working period te1 of the drive control unit 240 overlaps with the modulation phase tm of the modulation signal Sweep, the start time of the working period te2 of the drive control unit 240 can be located before the start time of the working period te1 of the light-emitting control unit 140. In the early stage of the working period te1 of the light-emitting control unit 140, the voltage of the second node N2 has been coupled to a higher level by the coupling unit 230, and the second drive transistor M10 is turned off. Regardless of whether the drive control unit 240 is in the working period te2, the third power signal VDD2 can be avoided from being transmitted to the first drive unit 110, affecting the light-emitting element LED to display light emission. At the same time, the start time of the working period te2 of the drive control unit 240 should be avoided from being located before the modulation phase tm of the modulation signal Sweep. In this way, it can be ensured that in the early stage of the working period te2 of the drive control unit 240, the third power signal VDD2 will not be transmitted to the first drive unit 110, thus avoiding affecting the written first data signal Data1.

[0101] Based on the same inventive concept, embodiments of the present invention also provide a display panel. Figure 15 This is a top view structural diagram of a display panel provided in an embodiment of the present invention, for reference. Figure 15 The display panel 01 includes a display area AA and a non-display area NA. The display panel 01 also includes a plurality of pixels P located in the display area AA. Each pixel P includes a pixel circuit 41 and a light-emitting element LED. The pixel circuit 41 can be a pixel circuit provided in any embodiment of the present invention.

[0102] For example, each pixel circuit 41 includes the auxiliary module 300 described in any of the above embodiments. The control terminal of the auxiliary module 300 can receive an auxiliary control signal. When the auxiliary control signal is at an effective level, the auxiliary module 300 resets the light-emitting element LED, so that the light-emitting element LED enters the black state, so as to accurately control the light-emitting duration of the light-emitting element LED, thereby achieving precise control of the display grayscale and improving the display effect.

[0103] In one embodiment, each pixel circuit 41 can receive an auxiliary control signal, and two adjacent pixel circuits 41 can receive different auxiliary control signals, which is beneficial to accurately control the light-emitting duration of the light-emitting element LED of each pixel P, thereby achieving precise control of the display grayscale and improving contrast.

[0104] Optional, continue to refer to Figure 15The display panel 01 also includes a signal receiver 50, and the pixel circuit 41 includes a first pixel circuit 401 and a second pixel circuit 402. The first pixel circuit 401 is located on the side of the second pixel circuit 402 away from the signal receiver 50. The first pixel circuit 41 includes an auxiliary module 300; the second pixel circuit does not include an auxiliary module, and / or the second pixel circuit includes an auxiliary module 300, but the auxiliary module 300 is not operational.

[0105] For example, the display panel 01 may include multiple signal receivers 50, which can be used to receive power signals, auxiliary control signals, clock signals, and other signals supplied to the pixel circuit 41. The display panel 01 also includes multiple signal lines (not shown in the figure) connecting the signal receivers 50 and the pixel circuit 40. These signal lines are used to transmit signals supplied to the pixel circuit 41. The signal lines may include first signal lines and second signal lines. The first signal line is used to connect the receiver 50 and the first pixel circuit 401, and the second signal line is used to connect the receiver 50 and the first pixel circuit 402 (not shown in the figure). The first pixel circuit 41 is farther away from the signal receiver 50, and the second pixel circuit 402 is closer to the signal receiver 50. Therefore, the first signal line is longer and / or has a larger load, resulting in a more significant voltage drop on the first signal line, making the signal transmitted to the first pixel circuit more prone to distortion. The second signal line is shorter and / or has a smaller load, resulting in a smaller voltage drop on the second signal line, making the signal transmitted to the first pixel circuit less prone to distortion.

[0106] By setting the second pixel circuit 402, which is closer to the signal receiver 50, to not include the auxiliary module, and / or by including the auxiliary module 300 in the second pixel circuit but not operating the auxiliary module 300, the number of signal lines can be effectively reduced, especially the number of second signal lines used to transmit auxiliary control signals. This simplifies the structural design and reduces the difficulty of manufacturing processes.

[0107] In one embodiment, if the second pixel circuit 402, which is closer to the signal receiving end 50, includes an auxiliary module 300, the control terminal of the auxiliary module 300 in the second pixel circuit 402 can be connected to a signal with a fixed potential, so that the auxiliary module 300 in the second pixel circuit 402 is always in a non-working state, while the control terminal of the auxiliary module 300 in the first pixel circuit 401 can receive an auxiliary control signal including a valid pulse.

[0108] Optionally, the auxiliary module 300 of the pixel circuit 41 is used to reset the light-emitting element LED under the control of the auxiliary control signal; at least some of the auxiliary control signals received by the pixel circuit 41 are multiplexed from the auxiliary control signals received by the adjacent pixel circuit 41.

[0109] Specifically, adjacent pixel circuits 41 are close to each other, and the pixels P where adjacent pixel circuits 41 are located are also close to each other. Therefore, the gray levels of pixels P where adjacent pixel circuits 41 are located are also similar, which can provide the same auxiliary control signal to adjacent pixel circuits 41. This helps to reduce the number of signal lines used to transmit auxiliary control signals, simplify the structural design, reduce the difficulty of manufacturing, and at the same time, has little impact on the display effect.

[0110] Based on the same inventive concept, embodiments of the present invention also provide a display device. Figure 16 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention, such as... Figure 16 The display device 02 includes the display panel 01 provided in any embodiment of the present invention. The display device 02 provided in the embodiments of the present invention can be... Figure 16 The mobile phone shown can also be any electronic product with display function, including but not limited to the following categories: television, laptop, desktop monitor, tablet computer, digital camera, smart bracelet, smart glasses, in-vehicle display, medical equipment, industrial control equipment, touch interactive terminal, etc. The embodiments of the present invention do not make any special limitations on this.

[0111] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A pixel circuit, characterized in that, include: Light-emitting element, pulse amplitude modulation module, pulse width modulation module and auxiliary module; The pulse amplitude modulation module includes a first driving unit, a first writing unit, a storage unit, and a light-emitting control unit; the first driving unit is used to provide a first driving signal to the light-emitting element; the first writing unit is used to write a first data signal to the first driving unit; and the storage unit is used to store the first data signal in the first driving unit. The light-emitting control unit is used to control the first driving unit to provide the transmission path of the first driving signal to the light-emitting element; The pulse width modulation module includes a second driving unit, a second writing unit, a driving control unit, and a coupling unit; the second driving unit is used to provide a second driving signal to the first driving unit; the second writing unit is used to write a second data signal to the second driving unit; the coupling unit is used to couple the change in the modulation signal to the second driving unit; the driving control unit is used to control the second driving unit to provide a transmission path for the second driving signal to the first driving unit; The auxiliary module is used to reset the light-emitting element; wherein the working period of the auxiliary module overlaps with at least one of the working period of the light-emitting control unit, the working period of the drive control unit, and the modulation phase of the modulation signal.

2. The pixel circuit according to claim 1, characterized in that, The pulse amplitude modulation module also includes a reset unit; The reset unit is also used to reset the signal; wherein at least a portion of the working period of the reset unit does not overlap with the working period of the light-emitting control unit, the working period of the drive control unit, and the modulation phase of the modulation signal.

3. The pixel circuit according to claim 2, characterized in that, The pulse amplitude modulation module further includes a first initialization unit; the first initialization unit is used to initialize the first driving unit; And / or, the pulse width modulation module further includes a second initialization unit; the second initialization unit is used to initialize the second driving unit; The working period of the reset unit is the same as that of the first initialization unit and / or the second initialization unit, and the working period of the reset unit does not overlap with that of the auxiliary module.

4. The pixel circuit according to claim 2, characterized in that, The auxiliary module is reused as the reset unit; The working periods of the auxiliary module include a first working period and a second working period; The first working period does not overlap with the working period of the light-emitting control unit, the working period of the drive control unit, or the modulation phase of the modulation signal; The second working period overlaps with at least one portion of the working period of the light-emitting control unit, the working period of the drive control unit, and the modulation phase of the modulation signal.

5. The pixel circuit according to claim 1, characterized in that, The second driving unit includes a second driving transistor, the first terminal of the second driving transistor receives a third power supply signal, the second terminal of the second driving transistor is electrically connected to the first driving unit, and the gate of the second driving transistor is electrically connected to the coupling unit. The auxiliary module includes an auxiliary transistor, the first terminal of which receives an auxiliary reset signal, the second terminal of which is electrically connected to the light-emitting element, and the gate of which is electrically connected to the gate of the second driving transistor.

6. The pixel circuit according to claim 5, characterized in that, The first driving unit includes a first driving transistor, the first terminal of the first driving transistor receives a first power supply signal, and the second terminal of the first driving transistor is electrically connected to the second terminal of the auxiliary transistor. The voltage of the first power signal is less than the voltage of the third power signal; the voltage of the first power signal is equal to the voltage of the third power signal minus a preset compensation value.

7. The pixel circuit according to claim 1, characterized in that, The driving cycle of the pixel circuit includes at least a writing phase and a driving phase; The working periods of both the first writing unit and the second writing unit overlap with the writing phase; The operating period of the light-emitting control unit, the operating period of the driving control unit, and the modulation phase of the modulation signal overlap simultaneously during at least a portion of the driving phase. The driving phase includes a first driving phase and a second driving phase; During the first driving phase, the light-emitting element emits light; During the second driving phase, the light-emitting element stops emitting light; The second driving stage, within the same driving stage, is located after the first driving stage; The working period of the auxiliary module overlaps with the second driving phase; the working period of the auxiliary module does not overlap with the first driving phase.

8. The pixel circuit according to claim 7, characterized in that, The overlap between the working period of the auxiliary module and the driving phase is the duration of the second driving phase.

9. The pixel circuit according to claim 8, characterized in that, The second driving phase accounts for less than or equal to 70% of the total driving phase.

10. The pixel circuit according to claim 7, characterized in that, The second driving unit includes a second driving transistor, the first terminal of the second driving transistor receives a third power supply signal, the second terminal of the second driving transistor is electrically connected to the first driving unit, and the gate of the second driving transistor is electrically connected to the coupling unit. The voltage of the third power supply signal is V2; the voltage of the second data signal is Vdata2; During the modulation phase, the voltage of the modulation signal changes linearly with a slope of k; At the switching moment between the first driving phase and the second driving phase, compared with the non-modulation phase, the voltage change of the modulated signal is ΔV = |V2 - Vdata2|. The overlap duration between the working period of the auxiliary module and the modulation stage is ΔV / k.

11. The pixel circuit according to claim 7, characterized in that, The termination time of the driving phase overlaps with the working period of the auxiliary module.

12. The pixel circuit according to claim 1, characterized in that, The termination time of the modulation phase of the modulation signal overlaps with the working period of the light-emitting control unit; And / or, the termination time of the modulation phase of the modulation signal overlaps with the operating period of the drive control unit.

13. The pixel circuit according to claim 1, characterized in that, The end time of the working period of the drive control unit overlaps with the working period of the light-emitting control unit.

14. The pixel circuit according to claim 1, characterized in that, The start time of the working period of the light-emitting control unit overlaps with the modulation phase of the modulation signal; And / or, the start time of the working period of the drive control unit overlaps with the working period of the light emission control unit.

15. The pixel circuit according to claim 1, characterized in that, The start time of the working period of the drive control unit overlaps with the modulation phase of the modulation signal.

16. A display panel, characterized in that, It includes the pixel circuits described in any one of claims 1-15.

17. The display panel according to claim 16, characterized in that, It also includes a signal receiver; The pixel circuit includes a first pixel circuit and a second pixel circuit; the first pixel circuit is located on the side of the second pixel circuit away from the signal receiving end; The first pixel circuit includes the auxiliary module; The second pixel circuit does not include the auxiliary module; and / or the second pixel circuit includes the auxiliary module, but the auxiliary module is not operational.

18. The display panel according to claim 16, characterized in that, The auxiliary module of the pixel circuit is used to reset the light-emitting element under the control of the auxiliary control signal; The auxiliary control signals received by at least a portion of the pixel circuits are multiplexed from the auxiliary control signals received by adjacent pixel circuits.

19. A display device, characterized in that, Includes the display panel as described in any one of claims 16-18.

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