Pixel circuit, driving method thereof and display panel

Abstract

This application discloses a pixel circuit and its driving method, as well as a display panel. The pixel circuit includes: a driving module, the first terminal of which is connected to a first voltage source; a storage capacitor module, the first and second terminals of which are respectively connected to the first voltage source and the control terminal of the driving module; a data writing module, the second and third terminals of which are respectively connected to the first terminal of the driving module and the second scan line; a pre-writing module, the first, second, third, and fourth terminals of which are respectively connected to a data line, the first terminal of the data writing module, the first scan line, and the first terminal of the storage capacitor module, for providing the data voltage on the data line to the first terminal of the data writing module and the first terminal of the storage capacitor module; and a light-emitting module, the first terminal of which is connected to the second terminal of the driving module, and the second terminal of which is connected to a second voltage source. Through the above method, the pixel circuit of this application ensures both high refresh rate display function and good compensation effect.

Description

Technical Field

[0001] This application relates to the field of display panel technology, and in particular to a pixel circuit and its driving method, and a display panel. Background Technology

[0002] Nowadays, with the continuous development of display technology, people's demand for improving screen refresh rate is also increasing. However, the pixel circuit in traditional display panels usually uses a 7T1C (7 transistors and 1 capacitor) circuit. Since the capacitance value of the charging capacitor Cst in the 7T1C circuit is usually fixed, its charging time is limited. Therefore, when the 7T1C circuit performs Vdata (data voltage signal) writing compensation, there is a problem of insufficient high-frequency display compensation due to the shortened downlink time of high refresh rate display. Summary of the Invention

[0003] The main technical problem addressed by this application is to provide a pixel circuit and its driving method, as well as a display panel, which can solve the problem of insufficient compensation in the pixel circuit of the prior art when displaying at high frequencies.

[0004] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a pixel circuit, wherein the pixel circuit includes: a driving module, a first terminal of the driving module being connected to a first voltage source; a storage capacitor module, a first terminal of the storage capacitor module being connected to the first voltage source, and a second terminal of the storage capacitor module being connected to the control terminal of the driving module; a data writing module, a second terminal of the data writing module being connected to the first terminal of the driving module, and a third terminal of the data writing module being connected to a second scan line; a pre-writing module, a first terminal of the pre-writing module being connected to a data line, a second terminal of the pre-writing module being connected to the first terminal of the data writing module, a third terminal of the pre-writing module being connected to the first scan line, and a fourth terminal of the pre-writing module being connected to the first terminal of the storage capacitor module, for providing data voltage on the data line to the first terminal of the data writing module and the first terminal of the storage capacitor module; and a light-emitting module, a first terminal of the light-emitting module being connected to the second terminal of the driving module, and a second terminal of the light-emitting module being connected to the second voltage source.

[0005] The pre-write module includes a pre-write transistor and a pre-write capacitor. The first end of the pre-write transistor is connected to the data line, the second end of the pre-write transistor is connected to the first end of the pre-write capacitor and the first end of the data writing module, the third end of the pre-write transistor is connected to the first scan line, and the second end of the pre-write capacitor is connected to the first end of the storage capacitor module.

[0006] The pixel circuit also includes a compensation module. The first end of the compensation module is connected to the control end of the driving module, the second end of the compensation module is connected to the second end of the driving module, and the third end of the compensation module is connected to the second scan line, which is used to control the connection between the control end of the driving module and the second end of the driving module.

[0007] The compensation module is a dual-gate transistor, including a first compensation transistor and a second compensation transistor. The first end of the first compensation transistor is connected to the control terminal of the driving module, the second end of the first compensation transistor is connected to the first end of the second compensation transistor, the third end of the first compensation transistor is connected to the third end of the second compensation transistor and the second scan line, and the second end of the second compensation transistor is connected to the second terminal of the driving module.

[0008] The pixel circuit further includes a first initialization module and a second initialization module. The first end of the first initialization module is connected to the control end of the driving module, the second end of the first initialization module is connected to the first end of the second initialization module and the reference voltage line, the third end of the first initialization module is connected to the first scan line, the second end of the second initialization module is connected to the first end of the light-emitting module, and the third end of the second initialization module is connected to the first scan line, so as to control the initial voltage to be written to the second end of the storage capacitor module and the first end of the light-emitting module.

[0009] The first initialization module is a dual-gate transistor, including a first initialization transistor and a second initialization transistor. The first terminal of the first initialization transistor is connected to the control terminal of the driving module, the second terminal of the first initialization transistor is connected to the first terminal of the second initialization transistor, the third terminal of the first initialization transistor is connected to the third terminal of the second initialization transistor and the first scan line, and the second terminal of the second initialization transistor is connected to the first terminal of the second initialization module and the reference voltage line.

[0010] The pixel circuit further includes a first light-emitting control module and a second light-emitting control module. The first end of the first light-emitting control module is connected to a first voltage source, the second end of the first light-emitting control module is connected to a first end of the driving module, and the third end of the first light-emitting control module is connected to a transmission signal line to control the connection between the first voltage source and the first end of the driving module. The first end of the second light-emitting control module is connected to a second end of the driving module, the second end of the second light-emitting control module is connected to a first end of the light-emitting module, and the third end of the second light-emitting control module is connected to a transmission signal line to control the connection between the second end of the driving module and the first end of the light-emitting module.

[0011] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a driving method for a pixel circuit, applied in the pixel circuit as described above, wherein the driving method includes: in the data writing stage, controlling the pre-write transistor to be turned on, so as to transmit the data voltage to the first terminal of the data writing module and the first terminal of the pre-write capacitor; in the threshold compensation stage, controlling the data writing module and the compensation module to be turned on, charging the control terminal of the driving module to compensate the threshold voltage of the driving module; in the light emission stage during the display cycle, controlling the first light emission control module and the second light emission control module to be turned on, so that the driving module drives the light emission module to emit light according to the voltage of its control terminal and the second terminal.

[0012] The data writing phase also includes: controlling the first initialization module and the second initialization module to turn on, so as to write the initial voltage to the second terminal of the storage capacitor module and the first terminal of the light-emitting module.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a display panel, wherein the display panel includes a driving circuit and a pixel circuit connected to each other; wherein the pixel circuit is the pixel circuit as described in any of the above claims.

[0014] The beneficial effects of this application are as follows: Unlike the prior art, the pixel circuit provided in this application has a first terminal of the driving module connected to a first voltage source, a first terminal and a second terminal of the storage capacitor module connected to the first voltage source and the control terminal of the driving module, a second terminal and a third terminal of the data writing module connected to the first terminal of the driving module and the second scan line, and a first terminal, a second terminal, a third terminal and a fourth terminal of the pre-writing module connected to the data line, the first terminal of the data writing module, the first scan line and the first terminal of the storage capacitor module, respectively. The first terminal and a second terminal of the light-emitting module are connected to the second terminal of the driving module and the second voltage source, respectively. The pre-writing module is used to provide the data voltage on the data line to the first terminal of the data writing module and the first terminal of the storage capacitor module, so as to separate the writing of the data voltage and the compensation stage of the threshold voltage of the driving module, thereby effectively improving the compensation effect and significantly shortening the line writing time to ensure the high refresh rate display function. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0016] Figure 1 This is a schematic diagram of the structure of the pixel circuit of the first embodiment of this application;

[0017] Figure 2 This is a schematic diagram of the second embodiment of the pixel circuit of this application;

[0018] Figure 3 yes Figure 2 A schematic diagram of a specific embodiment of a mid-pixel circuit;

[0019] Figure 4 yes Figure 3 A timing diagram of the control signals corresponding to the driving method of the pixel circuit in the diagram;

[0020] Figure 5 yes Figure 3 A schematic diagram of the simulation results of the pixel circuit grayscale expansion;

[0021] Figure 6 This is a flowchart illustrating one embodiment of the pixel circuit driving method of this application;

[0022] Figure 7 This is a schematic diagram of the structure of one embodiment of the display panel of this application. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the pixel circuit according to the first embodiment of this application. In this embodiment, the pixel circuit 10 includes: a driving module 11, a storage capacitor module 12, a data writing module 13, a pre-writing module 14, and a light-emitting module 15.

[0028] It should be noted that, in the field of display technology, the display panel typically supplies current to the light-emitting module 15 in the pixel circuit 10 continuously via a constant current source output from its system power supply. Specifically, the magnitude of this current is controlled by the voltage regulation at the control terminal of the driving module 11 in the pixel circuit 10. This control terminal voltage is then written by the display panel's driving circuit to the corresponding data signal provided to the pixel circuit 10, and stored in the storage capacitor module 12 within the pixel circuit 10. This ensures that the light-emitting module 15 can continuously emit light during one scan cycle of the driving circuit, thereby achieving the corresponding image display.

[0029] Specifically, the first end of the drive module 11 is connected to the first voltage source 101 provided by the system power supply, and the first voltage source 101 is specifically a constant current source.

[0030] The first end of the storage capacitor module 12 is also connected to the first voltage source, and the second end of the storage capacitor module 12 is connected to the control end of the drive module 11.

[0031] Furthermore, the second end of the data writing module 13 is connected to the first end of the driving module 11, and the third end of the data writing module 13 is connected to the second scan line 203 in the corresponding display panel to receive the second scan signal provided by the second scan line 203.

[0032] The first end of the pre-write module 14 is connected to the data line 201 in the display panel to receive the data voltage provided by the data line 201. The second end of the pre-write module 14 is connected to the first end of the data writing module 13. The fourth end of the pre-write module 14 is connected to the first end of the storage capacitor module 12. The third end of the pre-write module 14 is connected to the first scan line 202 to receive the first scan signal provided by the first scan line 202. When the first scan signal triggers conduction, the data voltage on the data line 201 is provided to the first end of the data writing module 13 and the first end of the storage capacitor module 12.

[0033] Furthermore, the first end of the light-emitting module 15 is specifically connected to the second end of the driving module 11, and the second end of the light-emitting module 15 is correspondingly connected to the second voltage source 102 provided by the power supply of the system, so that in one scan cycle of the driving circuit, it can continuously emit light based on the output voltage provided by the driving module 11 and the second voltage source 102 to realize the corresponding image display.

[0034] It is understood that the first scan line 202 and the second scan line 203 respectively correspond to the first scan signal and the second scan signal provided to the pre-write module 14 and the data write module 13 at different time periods. For example, the first time period and the second time period respectively trigger the pre-write module 14 and the data write module 13 to be turned on. Specifically, the first scan signal can trigger the pre-write module 14 to be turned on in the first time period, so as to provide the data voltage on the data line 201 to the first end of the data write module 13 and the first end of the storage capacitor module 12. Then, the data voltage is coupled and written to the control terminal of the driving module 11 through the storage capacitor module 12 to complete the writing of the data voltage in the pixel circuit 10.

[0035] Furthermore, during the second period, the data writing module 13 will be turned on by the second scanning signal to write the data voltage to the first terminal of the driving module 11. This allows the relatively long second period to compensate for the threshold voltage of the driving module 11, effectively separating the writing of the data voltage from the compensation stage of the threshold voltage of the driving module 11. This significantly shortens the line writing time while effectively improving the compensation effect, thus ensuring the high refresh rate display function.

[0036] Please see Figure 2 , Figure 2 This is a schematic diagram of the second embodiment of the pixel circuit of this application. This embodiment is based on the first embodiment of the pixel circuit provided in this application, and the pre-write module 24 in the pixel circuit 20 further includes a pre-write transistor 241 and a pre-write capacitor 242.

[0037] Specifically, the first end of the pre-write transistor 241 is connected to the data line 201 to receive the data voltage provided by the data line 201. The second end of the pre-write transistor 241 is connected to the first end of the pre-write capacitor 242 and the first end of the data writing module 23. The second end of the pre-write capacitor 242 is connected to the first end of the storage capacitor module 22. The third end of the pre-write transistor 241 is connected to the first scan line 202 to receive the first scan signal provided by the first scan line 202. When the first scan signal triggers conduction, the data voltage on the data line 201 is provided to the first end of the data writing module 23 and the first end of the pre-write capacitor 242. The data voltage is then coupled into the storage capacitor module 22 through the pre-write capacitor 242. Finally, the data voltage is coupled into the control terminal of the drive module 21 through the storage capacitor module 22 to complete the writing of the data voltage in the pixel circuit 20.

[0038] Understandably, compared to the traditional 7T1C circuit, which requires four transistors to write Vdata (i.e., the data voltage), resulting in a larger charging impedance and making it difficult to charge to the predetermined value in a short time, in this embodiment, the data voltage is written through only one pre-write transistor 241. This allows the pre-write capacitor 242 to be fully charged in the first time period, and the second time period can then be extended to compensate for the threshold voltage. This effectively separates the data voltage writing and threshold voltage compensation stages, thereby improving the compensation effect and significantly shortening the row write time.

[0039] In one embodiment, the pixel circuit 20 further includes a compensation module 26. The first end of the compensation module 26 is connected to the control end of the driving module 21, the second end of the compensation module 26 is connected to the second end of the driving module 21, and the third end of the compensation module 26 is connected to the second scan line 203 in the display panel. The compensation module 26 receives the second scan signal provided by the second scan line 203 to the third end of the compensation module 26. When the second scan signal triggers the conduction, the control end of the driving module 21 is connected to the second end of the driving module 21 to compensate the threshold voltage of the driving module 21. This prevents the light emission brightness of the light-emitting module 25 from changing due to the instability of the threshold voltage, thus avoiding severe uneven light emission.

[0040] Furthermore, in a specific embodiment, the compensation module 26 is a dual-gate transistor, including a first compensation transistor (not shown) and a second compensation transistor (not shown). The first end of the first compensation transistor is connected to the control terminal of the driving module 21, the second end of the first compensation transistor is connected to the first end of the second compensation transistor, the third end of the first compensation transistor is connected to the third end of the second compensation transistor and the second scan line 203, and the second end of the second compensation transistor is connected to the second terminal of the driving module 21. This composite connection of the first and second compensation transistors reduces the driving power requirements of the compensation module 26, achieving a more stable compensation effect.

[0041] In one embodiment, the pixel circuit 20 further includes a first initialization module 271 and a second initialization module 272. The first terminal of the first initialization module 271 is connected to the control terminal of the driving module 21, and the second terminal of the first initialization module 271 is connected to the first terminal of the second initialization module 272 and the reference voltage line 204 in the display panel, so that the first initialization module 271 and the second initialization module 272 can receive the initial voltage provided by the reference voltage line 204.

[0042] Furthermore, the third end of the first initialization module 271 is connected to the first scan line 202, and the second end of the second initialization module 272 is connected to the first end of the light-emitting module 25. The third end of the second initialization module 272 is also connected to the first scan line 202. The first initialization module 271 and the second initialization module 272 are used to receive the first scan signal provided by the first scan line 202. When the first scan signal triggers conduction, the first initial voltage provided by the reference voltage line 204 is written to the second end of the storage capacitor module 22 and the first end of the light-emitting module 25 to initialize the storage capacitor module 22 and the light-emitting module 25 at the same time, that is, to reset them and clear any signal residue that may exist in the previous stage.

[0043] Furthermore, in a specific embodiment, the first initialization module 271 is a dual-gate transistor, including a first initialization transistor (not shown) and a second initialization transistor (not shown). The first terminal of the first initialization transistor is connected to the control terminal of the drive module 21, the second terminal of the first initialization transistor is connected to the first terminal of the second initialization transistor, the third terminal of the first initialization transistor is connected to the third terminal of the second initialization transistor and the first scan line 202, and the second terminal of the second initialization transistor is connected to the first terminal of the second initialization module 272 and the reference voltage line 204. This combined connection of the first and second initialization transistors reduces the driving power requirements of the first initialization module 271, achieving a more stable initialization effect.

[0044] In one embodiment, the pixel circuit 20 further includes a first light-emitting control module 281 and a second light-emitting control module 282. The first end of the first light-emitting control module 281 is connected to a first voltage source 101 provided by the system power supply, the second end of the first light-emitting control module 281 is connected to a first end of the driving module 21, and the third end of the first light-emitting control module 281 is connected to a transmission signal line 205 in the display panel to receive the transmission signal provided by the transmission signal line 205 and trigger conduction under the action of the transmission signal to control the connection between the first voltage source 101 and the first end of the driving module 21.

[0045] Furthermore, the first end of the second light-emitting control module 282 is connected to the second end of the driving module 21, the second end of the second light-emitting control module 282 is connected to the first end of the light-emitting module 25, and the third end of the second light-emitting control module 282 is also connected to the transmitting signal line 205 to receive the transmitting signal provided by the transmitting signal line 205, and trigger conduction under the action of the transmitting signal to control the connection between the second end of the driving module 21 and the first end of the light-emitting module 25, thereby outputting the data voltage stored in the storage capacitor module 22 to the light-emitting module 25 to ensure that the light-emitting module 25 continuously emits light in one scan cycle.

[0046] Optionally, the driving module 21, compensation module 26, data writing module 23, pre-writing transistor 241, first initialization module 271, second initialization module 272, first light emission control module 281, and second light emission control module 282 may specifically include any reasonable switching device such as transistor, P-type thin film transistor, N-type thin film transistor, and field-effect transistor, and this application does not limit it.

[0047] It is worth noting that, to distinguish the two ends of the drive module 21 other than the control terminal, one terminal is referred to as the first terminal and the other as the second terminal. When the drive module 21 is a transistor, the control terminal can specifically be the base, the first terminal is the collector, and the second terminal is the emitter; or, the control terminal can also specifically be the base, the first terminal is the emitter, and the second terminal is the collector.

[0048] When the driving module 21 is a thin-film transistor or a field-effect transistor, the control terminal can specifically be the gate, the first terminal is the drain, and the second terminal is the source; or, the control terminal can specifically be the gate, the first terminal is the source, and the second terminal is the drain.

[0049] Furthermore, the first, second, and third ends of each of the above modules, excluding the drive module 21, correspond to the first, second, and control ends of the drive module 21, respectively.

[0050] In particular, when each module is a thin-film transistor or a field-effect transistor, it can also be a composite transistor or a single transistor, which is not limited in this application.

[0051] For ease of understanding, let's take a specific example of a P-type thin-film transistor in each of the above modules. Please refer to the relevant documentation for further details. Figure 3 and Figure 4 Among them, the Figure 3 yes Figure 2 A schematic diagram of a specific embodiment of a mid-pixel circuit. Figure 4 yes Figure 3 The timing diagram of the control signals corresponding to the driving method of the pixel circuit in the diagram.

[0052] It is understood that, in this embodiment, as Figure 3 As shown, the driving module 21, data writing module 23, pre-writing transistor 241, compensation module 26, first initialization module 271, second initialization module 272, first light-emitting control module 281, and second light-emitting control module 282 can specifically correspond to the first transistor T1, the second transistor T2, the eighth transistor T8, the third transistor T3, the fourth transistor T4, the seventh transistor T7, the fifth transistor T5, and the sixth transistor T6, respectively; and the storage capacitor module 22 corresponds to the first capacitor C1, the pre-writing capacitor 242 corresponds to the second capacitor C2, and the light-emitting module 25 corresponds to the light-emitting device. LED; the first scan line 202, the second scan line 203, the data line 201, the reference voltage line 204, and the transmit signal line 205 correspond to the first scan line Scan1, the second scan line Scan2, the data line Vdata, the reference voltage line Vref, and the transmit signal line EM, respectively; the first voltage source 101 and the second voltage source 102 correspond to the first voltage source Vdd and the second voltage source Vss, respectively; wherein, the third transistor T3 and the fourth transistor T4 can specifically be composite transistors to reduce the device's driving power requirements, and the connection method of the above-mentioned components is as follows. Figure 3 As shown, I will not go into detail here.

[0053] Therefore, it can be concluded that, Figure 4As shown, during the initialization and data writing phase, i.e., phase t1, the first scan signal provided by the first scan line Scan1 is in a low-level state, which can control the fourth transistor T4, the seventh transistor T7, and the eighth transistor T8 to be triggered and turned on, thereby writing the initial voltage provided by the reference voltage line Vref into the first capacitor C1 and the light-emitting device LED, respectively, to initialize the first capacitor C1 and the light-emitting device LED at the same time, that is, to reset the first capacitor C1 and the light-emitting device LED to clear any signal residue that may exist in the previous phase; at the same time, the data voltage on the data line Vdata is provided to the first terminal of the second capacitor C2 and the first terminal of the second transistor T2, and the data voltage is coupled into the first capacitor C1 through the second capacitor C2, and then coupled into the control terminal of the first transistor T1 through the first capacitor C1, so as to complete the writing of the data voltage in the pixel circuit 20.

[0054] Furthermore, during the threshold compensation stage, i.e. stage t2, the second scan signal provided by the second scan line Scan2 is in a low-level state, which can control the second transistor T2 and the third transistor T3 to be turned on, so as to transmit the data voltage of the first terminal of the second transistor T2 to the first terminal of the first transistor T1; and at the same time, the third transistor T3 will charge the control terminal of the first transistor T1 to compensate the threshold voltage of the first transistor T1.

[0055] Furthermore, during the light-emitting phase of the display cycle, i.e., during phase t3, the emission signal provided by the emission signal line EM is in a low-level state, which can control the fifth transistor T5 and the sixth transistor T6 to be triggered and turned on, thereby driving the first transistor T1 to emit light according to the voltage of its control terminal and the second terminal.

[0056] Understandably, compared to the traditional 7T1C circuit for writing Vdata (i.e., the data voltage), which requires passing through four transistors and has a larger charging impedance, making it difficult to charge to the predetermined value in a short time, in this embodiment, the second capacitor C2 and the eighth transistor T8 are used. Since the data voltage is written through only the eighth transistor T8, the second capacitor C2 can be fully charged in a short time during the t1 stage. After that, the t2 stage can be lengthened to compensate for the threshold voltage. This effectively separates the data voltage writing stage from the threshold voltage compensation stage, thereby effectively improving the compensation effect and significantly shortening the row write time.

[0057] For further information, please refer to [link / reference]. Figure 5 , Figure 5 yes Figure 3 A schematic diagram of the simulation results of the pixel circuit with 20 grayscale expansion.

[0058] Therefore, according to the simulation results, the pixel circuit 20 in this embodiment can work normally and the grayscale unfolding is normal. The current ratio is >1E6 in the vdata range of 0 to 7V (the difference between the source-drain current Ids of the first transistor T1 corresponding to the two brightness levels and its gate voltage Vgs), which meets the switching ratio requirements of the light-emitting device LED.

[0059] This application also provides a method for driving pixel circuits; please refer to [link to relevant documentation]. Figure 6 , Figure 6 This is a flowchart illustrating one embodiment of the pixel circuit driving method of this application. Specifically, it may include the following steps:

[0060] S31: During the data writing phase, the pre-write transistor is turned on to transmit the data voltage to the first terminal of the data writing module and the first terminal of the pre-write capacitor.

[0061] It is understood that the driving method in this embodiment specifically refers to the driving circuit in the corresponding display panel driving such as... Figure 2 For details on the method of driving the pixel circuit shown, please refer to [reference needed]. Figure 2 and Figure 4 The relevant textual content will not be repeated here.

[0062] Among them, such as Figure 4 As shown, during the data writing stage, i.e., during stage t1, the first scan signal provided by the first scan line is in a low-level state, which can control the pre-write transistor and the compensation module to be triggered and turned on, so as to transmit the data voltage provided by the data line to the first end of the data writing module and the first end of the pre-write capacitor.

[0063] S32: During the threshold compensation stage, the control data writing module and the compensation module are turned on to charge the control terminal of the drive module in order to compensate the threshold voltage of the drive module.

[0064] Furthermore, during the threshold compensation stage, i.e. stage t2, the second scan signal provided by the second scan line is in a low-level state, which can control the data writing module and the compensation module to be turned on, so as to transmit the data voltage at the first end of the data writing module to the first end of the drive module, and at the same time, the compensation module will charge the control end of the drive module to compensate the threshold voltage of the drive module.

[0065] S33: During the light-emitting phase of the display cycle, the first light-emitting control module and the second light-emitting control module are turned on so that the driving module drives the light-emitting module to emit light according to the voltage of its control terminal and the second terminal.

[0066] Furthermore, during the light-emitting phase of the display cycle, specifically during phase t3, the transmission signal provided by the transmission signal line is in a low-level state, which enables the first light-emitting control module and the second light-emitting control module to be triggered and turned on, thereby allowing the driving module to drive the light-emitting module to emit light according to the voltage of its control terminal and the second terminal.

[0067] Furthermore, in one embodiment, the above-mentioned S31 may further include: an initialization stage, that is, in stage t1, the first scan signal provided by the first scan line is in a low-level state, so as to simultaneously control the first initialization module and the second initialization module to be turned on, thereby writing the initial voltage provided by the reference voltage line to the second terminal of the storage capacitor module and the first terminal of the light-emitting module respectively, so as to simultaneously initialize the adjustable capacitor module and the light-emitting module, that is, to reset the adjustable capacitor module and the light-emitting module, so as to clear the signal residue that may exist in the previous stage.

[0068] This application also provides a display panel; please refer to [link / reference]. Figure 7 , Figure 7 This is a schematic diagram of one embodiment of the display panel of this application. In this embodiment, the display panel 40 includes a driving circuit 41 and a pixel circuit 42 connected to each other.

[0069] It should be noted that the pixel circuit 42 described in this embodiment is either the pixel circuit 10 or the pixel circuit 20 described in any of the above embodiments. Please refer to [link / reference] for details. Figures 1-5 The relevant textual content will not be elaborated upon here.

[0070] The beneficial effects of this application are as follows: Unlike the prior art, the pixel circuit provided in this application has a first terminal of the driving module connected to a first voltage source, a first terminal and a second terminal of the storage capacitor module connected to the first voltage source and the control terminal of the driving module, a second terminal and a third terminal of the data writing module connected to the first terminal of the driving module and the second scan line, and a first terminal, a second terminal, a third terminal and a fourth terminal of the pre-writing module connected to the data line, the first terminal of the data writing module, the first scan line and the first terminal of the storage capacitor module, respectively. The first terminal and a second terminal of the light-emitting module are connected to the second terminal of the driving module and the second voltage source, respectively. The pre-writing module is used to provide the data voltage on the data line to the first terminal of the data writing module and the first terminal of the storage capacitor module, so as to separate the writing of the data voltage and the compensation stage of the threshold voltage of the driving module, thereby effectively improving the compensation effect and significantly shortening the line writing time to ensure the high refresh rate display function.

[0071] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A driving method of a pixel circuit, characterized by, The pixel circuit comprises: a driving module, a first end of the driving module being connected to a first voltage source; a storage capacitor module, a first end of the storage capacitor module being connected to the first voltage source, and a second end of the storage capacitor module being connected to a control end of the driving module; a data writing module, a second end of the data writing module being connected to a first end of the driving module, and a third end of the data writing module being connected to a second scan line; a pre-writing module, a first end of the pre-writing module being connected to a data line, a second end of the pre-writing module being connected to a first end of the data writing module, a third end of the pre-writing module being connected to a first scan line, and a fourth end of the pre-writing module being connected to a first end of the storage capacitor module, so as to provide a data voltage on the data line to the first end of the data writing module and the first end of the storage capacitor module; a light emitting module, a first end of the light emitting module being connected to a second end of the driving module, and a second end of the light emitting module being connected to a second voltage source; the pre-writing module comprises a pre-writing transistor and a pre-writing capacitor, a first end of the pre-writing transistor being connected to the data line, a second end of the pre-writing transistor being connected to a first end of the pre-writing capacitor and a first end of the data writing module, and a third end of the pre-writing transistor being connected to the first scan line, and a second end of the pre-writing capacitor being connected to the first end of the storage capacitor module; the pixel circuit further comprises a compensation module, a first end of the compensation module being connected to the control end of the driving module, a second end of the compensation module being connected to the second end of the driving module, and a third end of the compensation module being connected to the second scan line, so as to control the communication between the control end of the driving module and the second end of the driving module; the compensation module is a double-gate transistor, comprising a first compensation transistor and a second compensation transistor, a first end of the first compensation transistor being connected to the control end of the driving module, a second end of the first compensation transistor being connected to a first end of the second compensation transistor, a third end of the first compensation transistor being connected to a third end of the second compensation transistor and the second scan line, and a second end of the second compensation transistor being connected to the second end of the driving module; the pixel circuit further comprises a first initialization module and a second initialization module, a first end of the first initialization module being connected to the control end of the driving module, a second end of the first initialization module being connected to a first end of the second initialization module and a reference voltage line, a third end of the first initialization module being connected to the first scan line, a second end of the second initialization module being connected to a first end of the light emitting module, and a third end of the second initialization module being connected to the first scan line, so as to control the writing of an initial voltage to the second end of the storage capacitor module and the first end of the light emitting module. The first initialization module is a double-gate transistor, comprising a first initialization transistor and a second initialization transistor, a first end of the first initialization transistor is connected to a control end of the driving module, a second end of the first initialization transistor is connected to a first end of the second initialization transistor, a third end of the first initialization transistor is connected to a third end of the second initialization transistor and the first scan line, and a second end of the second initialization transistor is connected to a first end of the second initialization module and the reference voltage line; The pixel circuit further comprises a first light-emitting control module and a second light-emitting control module, a first end of the first light-emitting control module is connected to the first voltage source, a second end of the first light-emitting control module is connected to a first end of the driving module, and a third end of the first light-emitting control module is connected to an emission signal line, so as to control the communication between the first voltage source and the first end of the driving module; a first end of the second light-emitting control module is connected to a second end of the driving module, a second end of the second light-emitting control module is connected to a first end of the light-emitting module, and a third end of the second light-emitting control module is connected to the emission signal line, so as to control the communication between the second end of the driving module and the first end of the light-emitting module, The driving method comprises: in the data writing stage, the pre-writing transistor is controlled to be turned on, and the data line provides a data voltage to transmit the data voltage to the first end of the data writing module and the first end of the pre-writing capacitor; the data writing stage further comprises: controlling the first initialization module and the second initialization module to be turned on, so as to write an initial voltage to the second end of the storage capacitor module and the first end of the light-emitting module; in the threshold compensation stage, the data writing module and the compensation module are controlled to be turned on, the control end of the driving module is charged, so as to compensate the threshold voltage of the driving module, at the same time, the pre-writing capacitor writes the stored data voltage to the gate of the driving transistor through the data writing module and the compensation module, the storage capacitor module stores the voltage written to the gate of the driving transistor, and the time when the pre-writing capacitor writes the stored data voltage to the gate of the driving transistor is located before the light-emitting stage; in the light-emitting stage in the display period, the first light-emitting control module and the second light-emitting control module are controlled to be turned on, so that the driving module drives the light-emitting module to emit light according to the voltages of the control end and the second end thereof.

2. A pixel circuit, characterized by comprising: The pixel circuit adopts the driving method according to claim 1, and the pixel circuit comprises: a driving module, a first end of the driving module is connected to a first voltage source; a storage capacitor module, a first end of the storage capacitor module is connected to the first voltage source, and a second end of the storage capacitor module is connected to a control end of the driving module; a data writing module, a second end of the data writing module is connected to a first end of the driving module, and a third end of the data writing module is connected to a second scan line; a pre-write module, a first end of the pre-write module is connected with the data line, a second end of the pre-write module is connected with the first end of the data write module, a third end of the pre-write module is connected with the first scan line, and a fourth end of the pre-write module is connected with the first end of the storage capacitor module, so as to provide the data voltage on the data line to the first end of the data write module and the first end of the storage capacitor module; a light emitting module, a first end of the light emitting module is connected with the second end of the driving module, and a second end of the light emitting module is connected with the second voltage source; the pre-write module comprises a pre-write transistor and a pre-write capacitor, a first end of the pre-write transistor is connected with the data line, a second end of the pre-write transistor is connected with the first end of the pre-write capacitor and the first end of the data write module, a third end of the pre-write transistor is connected with the first scan line, and a second end of the pre-write capacitor is connected with the first end of the storage capacitor module; the pixel circuit further comprises a compensation module, a first end of the compensation module is connected with the control end of the driving module, a second end of the compensation module is connected with the second end of the driving module, and a third end of the compensation module is connected with the second scan line, so as to control the communication between the control end of the driving module and the second end of the driving module; the compensation module is a double-gate transistor, comprising a first compensation transistor and a second compensation transistor, a first end of the first compensation transistor is connected with the control end of the driving module, a second end of the first compensation transistor is connected with a first end of the second compensation transistor, a third end of the first compensation transistor is connected with a third end of the second compensation transistor and the second scan line, and a second end of the second compensation transistor is connected with the second end of the driving module; the pixel circuit further comprises a first initialization module and a second initialization module, a first end of the first initialization module is connected with the control end of the driving module, a second end of the first initialization module is connected with a first end of the second initialization module and the reference voltage line, a third end of the first initialization module is connected with the first scan line, a second end of the second initialization module is connected with a first end of the light emitting module, and a third end of the second initialization module is connected with the first scan line, so as to control the writing of the initial voltage to the second end of the storage capacitor module and the first end of the light emitting module; the first initialization module is a double-gate transistor, comprising a first initialization transistor and a second initialization transistor, a first end of the first initialization transistor is connected with the control end of the driving module, a second end of the first initialization transistor is connected with a first end of the second initialization transistor, a third end of the first initialization transistor is connected with a third end of the second initialization transistor and the first scan line, and a second end of the second initialization transistor is connected with the first end of the second initialization module and the reference voltage line; The pixel circuit further comprises a first light-emitting control module and a second light-emitting control module, a first end of the first light-emitting control module is connected with the first voltage source, a second end of the first light-emitting control module is connected with a first end of the driving module, and a third end of the first light-emitting control module is connected with the emission signal line, so as to control the communication between the first voltage source and the first end of the driving module; a first end of the second light-emitting control module is connected with a second end of the driving module, a second end of the second light-emitting control module is connected with a first end of the light-emitting module, and a third end of the second light-emitting control module is connected with the emission signal line, so as to control the communication between the second end of the driving module and the first end of the light-emitting module.

3. A display panel, characterized by, The display panel comprises a driving circuit and a pixel circuit connected with each other. The pixel circuit is the pixel circuit as claimed in claim 2.

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