Pixel driving circuit, display panel and display device

Abstract

The utility model provides a pixel driving circuit, a display panel and a display device, and relates to the technical field of display, the pixel driving circuit comprises a first light-emitting control transistor, a first reset transistor and a pre-charging module, a first electrode of the first light-emitting control transistor is coupled with a first power supply voltage end, and a second electrode of the first reset transistor is coupled with a second power supply voltage end; the second electrode of the first light-emitting control transistor is electrically connected with the anode of the light-emitting element, the grid of the first light-emitting control transistor is connected with a light-emitting control signal end, and the cathode of the light-emitting element is connected with a second power supply voltage end; a first pole of the first reset transistor is connected with a first reset signal end, a second pole of the first reset transistor is connected with an anode of the light-emitting element, and a grid of the first reset transistor is connected with an anode reset control signal end; the first end of the pre-charging module is connected with the pre-charging voltage end, the second end of the pre-charging module is connected with the anode of the light-emitting element, and the control end of the pre-charging module is connected with the pre-charging control signal end. Therefore, the time for turning on the light-emitting element is shortened, and the display effect is improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular to a pixel driving circuit, a display panel and a display device. BACKGROUND

[0002] With the continuous development of science and technology, more and more display products, such as mobile phones, tablet computers, notebook computers, smart wearable devices, and spliced display devices, are widely used in people's daily life and work, bringing great convenience to people's daily life and work, and becoming an indispensable important tool for people today.

[0003] At present, how to improve the display effect of the display product has become one of the technical problems to be solved. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the above technical problems, the present disclosure provides a pixel driving circuit, a display panel and a display device to improve the display effect.

[0005] In a first aspect, the present disclosure provides a pixel driving circuit for electrically connecting with a light emitting element, comprising a first light emitting control transistor and a pre-charging module, a first electrode of the first light emitting control transistor is coupled with a first power voltage terminal, a second electrode of the first light emitting control transistor is electrically connected with an anode of the light emitting element, a gate of the first light emitting control transistor is connected with a light emitting control signal terminal, and a cathode of the light emitting element is connected with a second power voltage terminal.

[0006] A first end of the pre-charging module is connected with a pre-charging voltage terminal, a second end of the pre-charging module is connected with the anode of the light emitting element, and a control end of the pre-charging module is connected with a pre-charging control signal terminal.

[0007] In a second aspect, based on the same inventive concept, the present disclosure provides a display panel comprising the pixel driving circuit provided in the first aspect of the present disclosure.

[0008] In a third aspect, based on the same inventive concept, the present disclosure further provides a display device comprising the display panel provided in the second aspect of the present disclosure.

[0009] The technical scheme provided by the embodiments of the present disclosure has the following advantages compared with the prior art:

[0010] In the pixel driving circuit, the display panel and the display device provided by the embodiments of the present disclosure, a pre-charging module connected with the anode of the light emitting element is introduced, which is used to pre-charge the anode of the light emitting element before the light emitting element emits light, so as to increase the potential of the anode of the light emitting element. In this way, it is beneficial to reduce the time required for the actual lighting of the light emitting element in the light emitting stage, and to prolong the actual light emitting time, thereby being beneficial to improve the light emitting brightness and to improve the display effect. Attached Figure Description

[0011] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0012] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 The diagram shown is a partial schematic of a pixel driving circuit provided in an embodiment of this disclosure;

[0014] Figure 2 The diagram shows the timing of the corresponding signals at the light emission control terminal and the precharge control terminal.

[0015] Figure 3 The diagram shown is a partial schematic of another pixel driving circuit provided in an embodiment of this disclosure;

[0016] Figure 4 The diagram shows the timing of the signals corresponding to the light emission control signal terminal, the precharge control signal terminal, and the reset control signal terminal.

[0017] Figure 5 The diagram shown is a schematic diagram of a pixel driving circuit provided in an embodiment of this disclosure.

[0018] Figure 6 As shown Figure 5 A timing diagram of a mid-pixel driving circuit;

[0019] Figure 7 The diagram shown is a structural schematic of a display panel provided in an embodiment of this disclosure;

[0020] Figure 8 The diagram shows a pulse of the light emission control signal corresponding to a row of pixel driving circuits.

[0021] Figure 9 The diagram shows the pulses of the light emission control signal, reset control signal, and precharge control signal corresponding to the row pixel driving circuit.

[0022] Figure 10 The figure shows a timing diagram of the light emission control signal and reset control signal corresponding to the Nth pixel circuit row;

[0023] Figure 11A timing diagram of the light-emitting control signal, the reset control signal and the pre-charge control signal corresponding to the Nth row of pixel circuits is shown.

[0024] Figure 12 Another timing diagram of the light-emitting control signal and the reset control signal corresponding to the Nth row of pixel circuits is shown.

[0025] Figure 13 A timing diagram of the anode voltage variation of the light-emitting element under different currents is shown.

[0026] Figure 14 Another timing diagram of the light-emitting control signal, the reset control signal and the pre-charge control signal corresponding to the Nth row of pixel circuits is shown.

[0027] Figure 15 A timing diagram of the anode voltage variation of the light-emitting element under different currents after introducing the pre-charge module is shown.

[0028] Figure 16 Another timing diagram of the anode voltage variation of the light-emitting element under different currents after introducing the pre-charge module is shown.

[0029] Figure 17 A structural schematic diagram of the display device provided by the embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0030] In order to enable a more clear understanding of the above-mentioned purposes, features and advantages of the present disclosure, the schemes of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0031] In the following description, many specific details are set forth in order to fully understand the present disclosure, but the present disclosure can also be implemented in other manners different from those described herein; obviously, the embodiments in the description are only some of the embodiments of the present disclosure, not all the embodiments.

[0032] Figure 1 A partial schematic diagram of the pixel driving circuit provided by the embodiment of the present disclosure is shown, please refer to Figure 1The embodiment of the present disclosure provides a pixel driving circuit 00, which is used for being electrically connected with a light emitting element D0 and comprises a first light emitting control transistor M6 and a pre-charge module 10. The first electrode of the first light emitting control transistor M6 is coupled with a first power voltage terminal ELVDD, the second electrode of the first light emitting control transistor M6 is electrically connected with an anode Anode of the light emitting element D0, the gate of the first light emitting control transistor M6 is connected with a light emitting control signal terminal EM, and the cathode of the light emitting element D0 is connected with a second power voltage terminal ELVSS. Optionally, the first power voltage terminal ELVDD is a positive power voltage terminal, and the second power voltage terminal ELVSS is a negative power voltage terminal. The first end of the pre-charge module 10 is connected with a pre-charge voltage terminal VREFP, the second end of the pre-charge module 10 is connected with the anode Anode of the light emitting element D0, and the control end of the pre-charge module 10 is connected with a pre-charge control signal terminal PCG.

[0033] In the present disclosure, the pixel driving circuit 00 is electrically connected with the light emitting element D0, and is used for providing a driving signal to the light emitting element D0 to drive the light emitting element D0 to emit light. The light emitting element D0 in the present disclosure may, for example, be an organic light emitting device such as an OLED (Organic Light-Emitting Diode), or may be an inorganic light emitting device such as an LED, a Micro LED or a Mini LED, and the like, and the present disclosure does not make specific limitation on this. The pixel driving circuit 00 is at least used for receiving a light emitting control signal EM, which is configured to control the light emitting element D0 to emit light. When an effective pulse signal of the light emitting control signal EM is transmitted to the pixel driving circuit 00, the light emitting element D0 can be controlled to emit light.

[0034] Figure 2 The timing diagram of the signals corresponding to the light emitting control signal terminal EM and the pre-charge control signal terminal PCG is shown, and it should be noted that the same reference signs are used in the present disclosure to represent the signal terminal and the signal transmitted by the signal terminal. Please refer to the above description of the pixel driving circuit 00 for details. Figure 1 and Figure 2When the pre-charge module 10 is introduced in the pixel driving circuit 00 of the present disclosure, the third active level signal S3 can be sent to the pre-charge module 10 before the light emitting element D0 emits light, that is, before the first active pulse signal S1 is sent to the first light emitting control transistor M6 through the light emitting control signal end EM, so as to turn on the pre-charge module 10 and pre-charge the anode Anode of the light emitting element D0 by using the pre-charge module 10 to improve the potential of the anode Anode of the light emitting element D0. For the light emitting element D0, the anode Anode voltage needs to reach a preset voltage value (turn-on voltage value) to realize light emission. When the current is provided to the light emitting element D0, the voltage of the anode Anode of the light emitting element D0 usually has a climbing process, that is, the voltage gradually rises to the turn-on voltage value (the minimum voltage at which the light emitting element can emit light) to emit light. When the pre-charge module 10 is introduced in the present disclosure, the anode Anode of the light emitting element D0 can be pre-charged before the light emitting element D0 emits light, so as to improve the potential of the anode Anode of the light emitting element D0. In this way, the time required to charge the potential of the anode Anode of the light emitting element D0 to the turn-on voltage value can be shortened in the light emitting stage, so as to prolong the time for the light emitting element to stably emit light, improve the light emitting brightness of the light emitting element, and improve the overall display brightness and display effect of the display panel.

[0035] It should be noted that the first pole of the transistor mentioned in the present disclosure generally refers to the input end of the corresponding transistor, and the second pole of the transistor generally refers to the output end of the corresponding transistor.

[0036] Figure 3 Another partial schematic diagram of the pixel driving circuit 00 provided by the present disclosure is shown, Figure 4 The timing diagram of the signals corresponding to the light emitting control signal end EM, the pre-charge control signal end PCG, and the reset control signal end RST is shown. Please refer to Figure 3 and Figure 4The pixel driving circuit 00 further comprises a first reset transistor M7, a first electrode of the first reset transistor M7 is connected with the first reset signal terminal VREFN, a second electrode of the first reset transistor M7 is connected with the anode Anode of the light emitting element D0, and a gate of the first reset transistor M7 is connected with the reset control signal terminal RST. In actual driving, first, the second effective pulse signal S2 in the reset control signal is provided to the gate of the first reset transistor M7 through the reset control signal terminal RST, so as to make the first reset transistor M7 conductive, and the reset signal transmitted by the first reset signal terminal VREFN resets the anode Anode of the light emitting element D0 and completely closes the light emitting element. Then, the pre-charge module 10 is controlled to be conductive, the anode of the light emitting element D0 is pre-charged to a preset voltage, and finally the first light emitting control transistor M6 is controlled to be conductive, so as to drive the light emitting element D0 to emit light. In the present disclosure, before the first effective pulse signal S1 is provided to the pixel driving circuit 00 to control the light emitting element D0 to emit light, the second effective pulse signal S2 is provided to the pixel driving circuit 00 to reset the anode Anode of the light emitting element D0, the reset signal is written into the anode Anode of the light emitting element D0, and the light emitting element D0 is completely closed. Thus, in subsequent pre-charging, the anode of each light emitting element D0 can be pre-charged based on the reset voltage value in the same state, so as to facilitate to ensure that the anode potential of the light emitting element is a fixed value before the light emitting element emits light, and thus the light emitting accuracy of the light emitting element is improved.

[0037] Please continue to refer to Figure 3In an optional embodiment of the present disclosure, the voltage value of the pre-charge voltage terminal VREFP connected with the pre-charge module 10 is greater than the voltage value of the first reset signal terminal VREFN connected with the first reset transistor M7. Assuming that the voltage value of the pre-charge voltage terminal VREFP is V1 and the voltage value of the first reset signal terminal VREFN is V0, V0 < V1 is set in the embodiment of the present disclosure, that is, when the anode of the light emitting element is reset, the light emitting element is completely turned off by the smaller voltage of the first reset signal terminal VREFN, and when pre-charging is performed, the potential of the anode of the light emitting element is increased to the voltage value V1. In the present disclosure, the voltage value V1 of the pre-charge voltage terminal VREFP is less than the turn-on voltage value V2 of the light emitting element. In this way, before entering the light emitting stage, that is, before sending the first effective pulse signal S1 to the first light emitting control transistor, the anode of the light emitting element is pre-charged by the pre-charge module 10, and the voltage value of the anode is increased to V1, which is less than the turn-on voltage value V2 of the light emitting element, which is beneficial to avoid the light emitting element from being accidentally lighted up in the stage when it is not needed to emit light. In the light emitting stage, the driving voltage is transmitted to the anode of the light emitting element, and the voltage value of the anode gradually increases on the basis of V1, and the light emitting element can emit light when the voltage value reaches the turn-on voltage value V2. Since the voltage value V1 is between the voltage value V0 of the first reset signal terminal VREFN and the turn-on voltage value V2, compared with the scheme of increasing the voltage of the anode of the light emitting element from the voltage value V0 to the voltage value V2, in the embodiment of the present disclosure, after introducing the pre-charge module 10, in the light emitting stage, the voltage of the anode of the light emitting element is increased from the voltage value V1 to the voltage value V2, which effectively reduces the time for increasing the potential of the anode of the light emitting element to the turn-on voltage value V2, thereby being beneficial to prolong the time length of stable light emission of the light emitting element, being beneficial to improve the light emission brightness of the light emitting element, and further being beneficial to improve the overall display effect of the display panel.

[0038] Please continue to refer to Figure 1 and Figure 3 In the pixel driving circuit 00 provided by the embodiment of the present disclosure, the pre-charge module 10 includes a pre-charge transistor M8, the first electrode of the pre-charge transistor M8 is connected with the pre-charge voltage terminal VREFP, the second electrode of the pre-charge transistor M8 is connected with the anode of the light emitting element D0, and the gate electrode of the pre-charge transistor M8 is connected with the pre-charge control signal terminal PCG. The pre-charge module 10 is formed by using one pre-charge transistor M8, and the pre-charge module 10 does not need to introduce a complex circuit structure, thereby being beneficial to simplify the overall structure of the pixel driving circuit.

[0039] It should be noted that the embodiments of the present disclosure take the pre-charge transistor M8, the first light-emitting control transistor M6 and the first reset transistor M7 as P-type transistors for example, the gate of the P-type transistor is turned on in response to a low-level signal and is turned off in response to a high-level signal, but the present disclosure is not limited thereto, and in some other embodiments of the present disclosure, at least one of the pre-charge transistor M8, the first light-emitting control transistor M6 and the first reset transistor M7 can also be embodied as an N-type transistor, the gate of the N-type transistor is turned on in response to a high-level signal and is turned off in response to a low-level signal.

[0040] Figure 5 Fig. 1 shows a circuit schematic diagram of the pixel driving circuit 00 provided by the embodiments of the present disclosure, please refer to Figure 5 The pixel driving circuit 00 provided by the embodiments of the present disclosure further includes a driving transistor M1 and a second reset transistor M4, the first electrode of the driving transistor M1 is coupled with the first power voltage terminal ELVDD, and the second electrode of the driving transistor M1 is electrically connected with the first electrode of the first light-emitting control transistor M6; the first electrode of the second reset transistor M4 is connected with the second reset signal terminal VREFN, and the embodiments of the present disclosure take the example that the corresponding reset signal terminals of the first reset transistor M7 and the second reset transistor M4 are the same, but the present disclosure is not limited thereto. The second electrode of the second reset transistor M4 is connected with the gate of the driving transistor, and the gate of the second reset transistor M4 is connected with the first control terminal Gate <n>. The embodiment takes the second reset transistor M4 and the driving transistor M1 as P-type transistors for example, but is not limited thereto. In some other embodiments of the present disclosure, at least one of the second reset transistor M4 and the driving transistor M1 can also be embodied as an N-type transistor. In the embodiment, the gate of the second reset transistor M4 is connected to the first control end Gate <n-1>The second reset transistor M4 is turned on by the low level signal of the second reset signal end VREFN, and after being turned on, the reset signal of the second reset signal end VREFN is transmitted to the gate of the driving transistor M1 through the second reset transistor M4, so as to reset the gate of the driving transistor M1.

[0041] Please continue to refer to Figure 5 The pixel driving circuit 00 provided by the embodiment of the present disclosure further comprises a data writing transistor M2 and a threshold compensation transistor M3. The first pole of the data writing transistor M2 is connected with the data signal end Data, the second pole of the data writing transistor M2 is connected with the first pole of the driving transistor M1, and the gate of the data writing transistor M2 is connected with the second control end Gate <n>; a first pole of the threshold compensation transistor M3 is connected to a second pole of the driving transistor M1, a second pole of the threshold compensation transistor M3 is connected to a gate of the driving transistor M1, and a gate of the threshold compensation transistor M3 is connected to the second control end Gate <n>In the present disclosure, the gate of the data writing transistor M2 and the gate of the threshold compensation transistor M3 are both connected to the second control end Gate <n>when the second control terminal Gate <n>When the effective pulse signal is provided, the data writing transistor M2 and the threshold compensation transistor M3 are both turned on, the signal of the data signal terminal Data is written to the first electrode of the driving transistor M1, and is transmitted to the gate of the driving transistor M1 through the threshold compensation transistor M3, so that the threshold compensation transistor M1 is threshold compensated, thereby reducing or avoiding the influence of the threshold voltage drift on the driving current.

[0042] It should be noted that the data writing transistor M2 and the threshold compensation transistor M3 are both P-type transistors in the embodiments of the present disclosure, but the present disclosure is not limited thereto, and in some other embodiments of the present disclosure, the data writing transistor M2 and the threshold compensation transistor M3 can also be N-type transistors, or one is a P-type transistor and the other is an N-type transistor.

[0043] Please continue to refer to Figure 5 The pixel driving circuit 00 provided by the embodiments of the present disclosure further includes a second light-emitting control transistor M5, the first electrode of the second light-emitting control transistor M5 is connected to the first power supply voltage terminal ELVDD, the second electrode of the second light-emitting control transistor M5 is connected to the first electrode of the driving transistor M1, and the gate of the second light-emitting control transistor M5 is connected to the light-emitting control signal terminal EM. In the embodiments, the second light-emitting control transistor M5 and the first light-emitting control transistor M6 are both P-type transistors, and the light-emitting control signal terminal EM is used to transmit the light-emitting control signal EM mentioned in the foregoing embodiments. When the low-level signal in the light-emitting control signal EM is transmitted to the gates of the first light-emitting control transistor M6 and the second light-emitting control transistor M5, the first light-emitting control transistor M6 and the second light-emitting control transistor M5 are turned on, and a current path is formed between the first power supply voltage terminal ELVDD and the second power supply voltage terminal ELVSS connected to the cathode of the light-emitting element D0. When the second light-emitting control transistor M5 is introduced between the first power supply voltage terminal ELVDD and the first electrode of the driving transistor M1, the second light-emitting control transistor M5 is only turned on in the light-emitting stage and remains off in other periods, thereby facilitating avoiding the signal of the first power supply voltage terminal ELVDD from being transmitted to the driving transistor M1 in unnecessary periods and affecting the final driving current.

[0044] Similarly, the embodiments only take the first light-emitting control transistor M6 and the second light-emitting control transistor M5 as P-type transistors for example, but the present disclosure is not limited thereto, and in some other embodiments of the present disclosure, at least one of the first light-emitting control transistor M6 and the second light-emitting control transistor M5 can also be an N-type transistor.

[0045] Optionally, the channel types of the transistors in the pixel driving circuit 00 are the same, for example, all P-type transistors or all N-type transistors, so that the same process can be used to manufacture the transistors with the same channel type in the actual manufacturing process, which is beneficial to simplify the manufacturing process of the pixel driving circuit and improve the production efficiency. Of course, part of the transistors in the pixel driving circuit can also be set as P-type transistors and the other part of the transistors can be set as N-type transistors according to actual needs, and the present disclosure does not limit this.

[0046] Figure 6 Fig. 1 shows a working timing diagram of the pixel driving circuit 00, and the following will be combined with Fig. 1 to describe the working process of the pixel driving circuit 00. Figure 5 Figure 5 The working process of the pixel driving circuit 00 in the embodiment will be described. The pixel driving circuit 00 includes nine working periods, which are as follows: Figure 6

[0047] Stage 1: The light emitting element D0 starts to close: the light emitting control signal EM jumps from low to high, and the light emitting element D0 controlled by the high level signal in the light emitting control signal EM starts to enter the non-light emitting stage. Since there is a parasitic capacitor across the light emitting element D0 and a stray capacitor in the pixel driving circuit 00, the light emitting element D0 is gradually closed as shown in Fig. 1. Figure 6 Stage 1 is gradually closed.

[0048] Stage 2: Pixel reset: the first control signal Gate <n-1>From high level to low level, for the reset of the gate of the driving transistor M1 in the pixel driving circuit 00, so as to ensure better uniformity of the pixel current.

[0049] Stage 3: pixel compensation and data writing and anode reset of the light emitting element D0: second control signal Gate <n>When the high level jumps to the low level, the data write transistor M2 and the threshold compensation transistor M3 are both turned on, the data signal terminal Data writes the data signal required to emit light, and the threshold voltage Vth of the drive transistor M1 is compensated by the unidirectional conduction of the threshold compensation transistor M3. The reset control signal RST controls the first reset transistor M7 to be turned on at the same time, and the reset signal VREFN voltage of the first reset signal terminal is written to Anode, and the light emitting element D0 is completely turned off.

[0050] Stage 4: The light emitting control signal EM is maintained at the high level, and pre-charging is performed: This stage is a maintenance stage from the anode reset of the light emitting element D0 to the low level of the light emitting control signal EM, and before the signal of the light emitting control signal EM jumps from high to low, the pre-charge control signal PCG jumps from high to low, the third effective pulse signal S3 appears, the pre-charge control transistor is turned on, and the pre-charge voltage signal of the pre-charge voltage terminal VREFP is written to the anode Anode of the light emitting element D0. The voltage difference in the process of charging the anode Anode of the light emitting element D0 from low to high in the subsequent light emitting stage can be reduced, and the waiting time of the light emitting control signal EM outputting the first effective pulse signal S1 to the stable light emitting stage of the light emitting element D0 can be reduced.

[0051] Stage 5: The light emitting element D0 starts to emit light: This stage is that the light emitting control signal EM jumps from high to low, which is equivalent to the first effective pulse signal S1, and the light emitting current generated by the drive transistor M1 starts to flow through the anode Anode of the light emitting element D0. Due to the stray capacitance inside the pixel and the parasitic capacitance of the light emitting element D0, the voltage of the anode Anode of the light emitting element D0 will gradually rise until it reaches the forward conduction voltage of the light emitting element D0, and then the voltage of the anode Anode of the light emitting element D0 will tend to be stable. Since the pre-charge module 10 is introduced, Figure 15 The time required in stage 5 will be reduced, that is, the time required from the conduction of the first light emitting control transistor M6 to the stable light emitting of the light emitting element D0 is reduced.

[0052] Stage 6: The light emitting element D0 stably emits light.

[0053] Stage 7: The light emitting control signal EM jumps from the low level to the high level again, the reset control signal RST jumps from the high level to the low level, the first reset transistor M7 is controlled to be turned on, the reset signal VREFN voltage of the first reset signal terminal is written to Anode, and the light emitting element D0 is completely turned off.

[0054] Stage 8: The pulse high level maintenance stage of the light emitting control signal EM, which repeats stage 4, pre-charges before the first effective pulse signal S1 of the light emitting control signal EM arrives, and reduces the waiting time before stable light emitting.

[0055] Stage 9: the pulse of the light emitting control signal EM changes from high to low, which is equivalent to the appearance of another first effective pulse signal S1, the stage repeats stage 5, and the light emitting element D0 gradually opens in this stage.

[0056] Based on the same inventive concept, the display panel 100 provided by the embodiment of the present disclosure also has the beneficial effects of the pixel driving circuit 00 mentioned in the foregoing embodiments of the present disclosure, and the same parts will not be described again. Figure 7 As shown in a structural schematic diagram of the display panel 100 provided by the embodiment of the present disclosure, the display panel 100 includes the pixel driving circuit 00 mentioned in the foregoing embodiments of the present disclosure. The display panel 100 provided by the embodiment of the present disclosure has the beneficial effects of the foregoing pixel driving circuit 00, and the same parts will not be described again.

[0057] Please refer to Figure 7 The display panel 100 provided by the embodiment of the present disclosure includes a plurality of pixel circuit rows 80, and each pixel circuit row 80 includes a plurality of pixel driving circuits 00 mentioned in the foregoing embodiments. In the embodiment, the plurality of pixel circuit rows 80 are arranged along the Y direction, and the pixel driving circuits in the pixel circuit row 80 are arranged along the X direction, but this is not a limitation. In some other embodiments of the present disclosure, the plurality of pixel circuit rows 80 can also be arranged along the X direction, and the pixel driving circuits in the pixel circuit row 80 are arranged along the Y direction. It should be noted that Figure 7 The number of pixel circuit rows 80 and the number of pixel driving circuits 00 included in the pixel circuit row 80 are only schematic, and do not limit the number of pixel circuit rows 80 actually included in the display panel and the number of pixel driving circuits 00 actually included in the pixel circuit row 80.

[0058] In the display panel 100 provided by the present disclosure, the plurality of pixel driving circuits 00 in one pixel circuit row 80 are connected to the same light emitting control signal line EM-L and receive the same light emitting control signal EM. It should be noted that Figure 7 Only the light emitting control signal line EM-L and the reset control signal line RST-L corresponding to the first pixel circuit row 80 are shown. Actually, the light emitting control signal line EM-L and the reset control signal line RST-L are also provided for other pixel circuit rows 80. The connection relationship between the pixel driving circuit 00 in the other pixel circuit row 80 and the light emitting control signal line EM-L and the reset control signal line RST-L can be referred to the first pixel circuit row 80, and the present disclosure will not be described again.

[0059] Figure 8 As shown in a pulse schematic diagram of the light emitting control signal corresponding to a row of pixel driving circuits, the embodiment shows the light emitting control signals EM corresponding to three pixel circuit rows 80 in the display panel, which are EM<1>, EM<2>, and EM<3>. Please continue to refer to Figure 7 and Figure 8 The pulse width of at least two first effective pulse signals S1 in the light-emitting control signal EM corresponding to one pixel circuit row 80 is different. That is, in the light-emitting control signal EM corresponding to one pixel circuit row 80 in the embodiment of the present disclosure, there are at least two first effective pulse signals S1 with different pulse widths. The pulse width of the first effective pulse signal S1 is at least related to the light-emitting duration of the light-emitting element D0. The greater the pulse width, the longer the light-emitting duration. Conversely, the smaller the pulse width, the shorter the light-emitting duration. For light-emitting elements with different gray scale requirements, when the gray scale is high, the first effective pulse signal S1 with a smaller pulse width or a larger pulse width can drive the light-emitting element D0 to emit light with the expected brightness; when the gray scale is low, the first effective pulse signal S1 with a larger pulse width is needed to drive the light-emitting element D0 to emit light with the expected brightness, and the first effective pulse signal S1 with a smaller pulse width cannot drive the light-emitting element D0 to emit light or cannot reach the expected brightness. Therefore, for light-emitting elements D0 with different gray scale requirements, if the first effective pulse signal S1 with a larger pulse width is used for control, the light-emitting duration of the light-emitting elements D0 with different gray scales is consistent and all emit light, which will lead to difficulty in further improving the contrast of the display product. Therefore, in the embodiment of the present disclosure, the first effective pulse signal S1 with different pulse widths is introduced, so that the light-emitting time of the light-emitting elements D0 with different gray scale requirements is modulated by the light-emitting time of the first effective pulse signal S1 with different pulse widths. For the light-emitting element D0 with high gray scale requirement, it can still emit light normally after receiving the control of the first effective pulse signal S1 with a smaller pulse width. For the light-emitting element D0 with low gray scale requirement, it will not emit light or the light-emitting time is short after receiving the first effective pulse signal S1 with a smaller pulse width. In this way, the light-emitting brightness of the light-emitting element D0 with high gray scale requirement can be higher, and the light-emitting brightness of the light-emitting element D0 with low gray scale requirement can be lower or not, thereby facilitating the improvement of the contrast of the display panel and the improvement of the display effect. At the same time, the effect of PAM+PWM common modulation can be achieved without introducing two sets of PAM and PWM circuits, and the structure of the pixel driving circuit 00 can be simplified by introducing the first effective pulse signal S1 with different pulse widths. In addition, the modulation of the light-emitting time and the light-emitting brightness of the light-emitting element with different gray scale requirements can be achieved by introducing the first effective pulse signal with different pulse widths, so that the PWM circuit for light-emitting time modulation and the PAM circuit for light-emitting brightness modulation do not need to be introduced again. Therefore, only one transmission of data signal is needed to achieve the modulation of the light-emitting time and the light-emitting brightness of the light-emitting element, so that compared with the scheme of simultaneously introducing the PWM circuit and the PAM circuit in the related art, the display panel of the present disclosure is beneficial to simplify the data transmission logic and reduce the amount of data transmission, thereby facilitating the reduction of bandwidth and the improvement of maximum light-emitting time.

[0060] Figure 9 Fig. 2 shows a pulse diagram of the light-emitting control signal EM, the reset control signal RST and the pre-charge control signal PCG corresponding to one row of pixel driving circuits 00. For reference, please refer to Figure 5 Figure 7 to Figure 9 In some optional embodiments of the present disclosure, the pixel driving circuit 00 is further configured to receive a reset control signal RST and a pre-charge control signal PCG. The reset control signal RST is configured to reset the anode of the light-emitting element D0, and the pre-charge control signal PCG is configured to control the pre-charge control module. The reset control signal corresponding to at least one row of pixel circuits includes N second active pulse signals S2, and the pre-charge control signal includes N third active pulse signals S3. The pixel driving circuit includes N pulse periods H0, each of which includes a first active pulse signal S1, a second active pulse signal S2 and a third active pulse signal S3. In each pulse period, the second active pulse signal S2 is located before the first active pulse signal S1, and the third active pulse signal S3 is located between the first active pulse signal S1 and the second active pulse signal S2. The first active pulse signal S1 is a signal for controlling the first light-emitting control transistor M6 to turn on and then make the light-emitting element D0 emit light, the second active pulse signal S2 is a signal for controlling the first reset transistor M7 to turn on and then reset the anode Anode of the light-emitting element D0, and the third active pulse signal S3 is a signal for controlling the pre-charge module 10 to turn on and then pre-charge the anode Anode of the light-emitting element D0.

[0061] It should be noted that the pulse period mentioned in the present embodiment is described by taking one row of pixel circuits as an example. Corresponding to Figure 9 In the first row, the starting time of the n-th second pulse signal S2 in the reset control signal RST<1> to the end time of the n-th first pulse signal S1 in the light-emitting control signal EM<1> corresponds to one pulse period H0. In the second row, the starting time of the n-th second pulse signal S2 in the reset control signal RST<2> to the end time of the n-th first pulse signal S1 in the light-emitting control signal EM<2> corresponds to one pulse period H0. In the third row, the starting time of the n-th second pulse signal S2 in the reset control signal RST<3> to the end time of the n-th first pulse signal S1 in the light-emitting control signal EM<3> corresponds to one pulse period H0.

[0062] ​In actual working process, first, the anode Anode of the light emitting element D0 is reset, and the light emitting element D0 is completely turned off. Then, the anode Anode of the light emitting element D0 is pre-charged by using the pre-charging module 10, so that the potential of the anode Anode is raised to a certain fixed voltage value. Finally, the first light emitting control transistor M6 is turned on, so that the driving current flows to the anode Anode of the light emitting element D0, and the potential of the anode Anode of the light emitting element D0 is continuously raised. When the potential is raised to the preset voltage value, the light emitting is realized. It can be seen that, by introducing the pre-charging module 10, the time from receiving the first effective pulse signal S1 to charging the potential of the anode Anode of the light emitting element D0 to the preset voltage value for stable light emitting is reduced. In this way, the time for stable light emitting of the light emitting element D0 is effectively improved within the corresponding time of the first effective pulse signal S1 with the preset pulse width, thereby facilitating the improvement of the overall display effect of the display panel.

[0063] Please refer to Figure 5 and Figure 9 In an optional embodiment of the present disclosure, the pulse widths of different second effective pulse signals S2 are the same. The second effective pulse signal S2 is a pulse for controlling the first reset transistor M7 to be turned on. In the reset control signal RST corresponding to a row of pixel driving circuits, the pulse widths of different second effective pulse signals S2 are set to be the same, so that the time length for performing the reset of the anode Anode of the light emitting element D0 each time is the same, which is beneficial to guarantee the reliability of the anode reset to ensure that the light emitting element D0 can be reliably turned off, and is also beneficial to simplify the anode reset control timing.

[0064] Please refer to Figure 5 and Figure 9 In an optional embodiment of the present disclosure, the pulse widths of different third effective pulse signals S3 are the same. The third effective pulse signal S3 is a pulse for controlling the pre-charging module 10 to be turned on. In the pre-charge control signal PCG corresponding to a row of pixel driving circuits 00, the widths of different third effective pulse signals S3 are set to be the same, so that the time for performing the pre-charging of the anode Anode of the light emitting element D0 each time is the same, thereby making the potential of the anode Anode of the light emitting element D0 before light emitting be the same. In the light emitting stage, the anode Anode of the light emitting element D0 corresponding to a row of pixel driving circuits is charged based on the same initial potential to realize light emitting, which is beneficial to improve the accuracy of light emitting of the light emitting element D0.

[0065] Figure 10 A timing diagram of the light emitting control signal and the reset control signal corresponding to the Nth row of pixel circuits is shown. Please refer to Figure 5 , Figure 7 and Figure 10 In an optional embodiment of the present disclosure, the first effective pulse signal S1 corresponding to the pixel circuit row 80 includes a first type of pulse signal S11 and a second type of pulse signal S12, the pulse width of the first type of pulse signal S11 is greater than the pulse width of the second type of pulse signal S12; the output current of the different pixel driving circuits 00 corresponding to the pixel circuit row 80 includes a first type of current and a second type of current, the current value of the first type of current is greater than the current value of the second type of current. When the display panel actually emits light, the gray scale of different light emitting elements D0 corresponding to one pixel row may be different. In this embodiment, it is assumed that in the light emitting elements D0 corresponding to one pixel row, the current required by some light emitting elements D0 with low gray scale is small, and the current required by some light emitting elements D0 with high gray scale is large. It should be noted that the first type of current and the second type of current output by the different pixel driving circuits 00 in one pixel circuit row 80 mentioned in this embodiment can refer to the current values of a part of the pixel driving circuits 00 corresponding to different pixel driving circuits 00 in one pixel row, which are the same and have a larger current value, and the current values of another part of the pixel driving circuits 00 are the same and have a smaller current value; or it can refer to dividing the current values output by the different pixel driving circuits 00 in one pixel circuit row into two types, the first type of current includes multiple currents with larger current values, and the second type of current includes multiple currents with smaller current values. That is, the current values output by at least two pixel driving circuits 00 in one pixel driving circuit 00 are different, and the two have a size, the currents with larger current values belong to the first type of current, and the currents with smaller current values belong to the second type of current.

[0066] In the embodiment, the light emitting element D0 receiving the first type of current emits light in response to the first type of pulse signal S11 or the second type of pulse signal S12, and the light emitting element D0 receiving the second type of current emits light in response to the first type of pulse signal S11. Considering that the grayscale requirement and current requirement of different light emitting elements D0 in one pixel circuit row are not completely the same, in the embodiment, the pulse widths of the multiple first active pulse signals S1 of the light emitting control signal EM corresponding to the pixel circuit row 80 are set to be not completely the same, the first active pulse signal S1 includes the first type of pulse signal S11 with a larger pulse width and the second type of pulse signal S12 with a smaller pulse width, so that when each pixel driving circuit 00 in the pixel circuit row 80 receives the first type of pulse signal S11 with a larger pulse width, each light emitting element D0 receiving the first type of current and the second type of current can emit light because the anode Anode of the light emitting element D0 is charged for a longer time. When each pixel driving circuit 00 in the pixel circuit row 80 receives the second type of pulse signal S12 with a smaller pulse width, the light emitting element D0 receiving the second type of current can not emit light or emit light for a shorter time because the anode Anode of the light emitting element D0 is charged for a shorter time and the light emitting element D0 receiving the second type of current can not be charged to the voltage for emitting light or the time for being charged to the voltage for emitting light is shorter because the current value of the second type of current is smaller, so that by introducing the first active pulse signal S1 with different pulse widths, the luminance of the light emitting element D0 with a high grayscale requirement can be higher, and the luminance of the light emitting element D0 with a low grayscale requirement can be lower or the light emitting element D0 can not emit light, so that the contrast of the display panel is improved.

[0067] Figure 11 The figure shows a timing diagram of the light emitting control signal, the reset control signal and the pre-charge control signal corresponding to the Nth pixel circuit row. Please refer to Figure 5 , Figure 7 and Figure 11 In an optional embodiment of the present disclosure, the pixel driving circuit 00 is further configured to receive a pre-charge control signal PCG, the pre-charge control signal PCG includes N third active pulse signals S3; each pulse period further includes a third active pulse signal S3, and the third active pulse signal S3 is located between the first active pulse signal S1 and the second active pulse signal S2 in each pulse period; and the light emitting element D0 receiving the second type of current emits light in response to the second type of pulse signal S12.

[0068] When the pre-charge module 10 is introduced into the pixel driving circuit 00, after the anode Anode of the light emitting element D0 is reset, and before the first effective pulse signal S1 is sent to the first light emitting control transistor N7, the pre-charge module 10 is turned on by the pre-charge control signal PCG to pre-charge the anode Anode of the light emitting element D0, so that the potential of the anode Anode of the light emitting element D0 is increased. After receiving the first effective pulse signal S1 subsequently, the potential of the anode Anode of the light emitting element D0 can be increased to the potential for emitting light in a short time, that is, the time from receiving the first effective pulse signal S1 to the light emitting element D0 stably emitting light can be saved. At this time, for the light emitting element D0 with low gray scale requirement, after receiving the second type pulse signal S12 with small pulse width, although the charging time of the anode Anode of the light emitting element D0 in the light emitting stage is shortened, since the time length of the light emitting element D0 entering the stable light emitting stage in the light emitting stage is also short, the light emitting element D0 can emit light in response to the second type pulse signal S12, but since the light emitting time is short, the low gray scale requirement of the light emitting element D0 can still be met.

[0069] Figure 12 Fig. 6 shows another timing diagram of the light emitting control signal and the reset control signal corresponding to the Nth pixel circuit row, Figure 13 Fig. 7 shows a timing diagram of the anode voltage change of the light emitting element under different current conditions, please refer to Figure 5 、 Figure 7 、 Figure 12 and Figure 13 In an optional embodiment of the present disclosure, the first effective pulse signal S1 corresponding to the pixel circuit row 80 includes a first type pulse signal S11, a second type pulse signal S12 and a third type pulse signal S13, the pulse width of the first type pulse signal S11 is greater than the pulse width of the second type pulse signal S12, and the pulse width of the second type pulse signal S12 is greater than the pulse width of the third type pulse signal S13; the output current of the different pixel driving circuits 00 corresponding to the pixel circuit row 80 includes a first type current, a second type current and a third type current, the current value of the first type current is greater than the current value of the second type current, and the current value of the second type current is greater than the current value of the third type current; the light emitting element D0 receiving the first type current emits light in response to the first type pulse signal S11, the second type pulse signal S12 or the third type pulse signal S13, the light emitting element D0 receiving the second type current emits light in response to the first type pulse signal S11 or the second type pulse signal S12, and the light emitting element D0 receiving the third type current emits light in response to the first type pulse signal S11.

[0070] The first type of pulse signal S11, the second type of pulse signal S12 and the third type of pulse signal S13 are introduced in this embodiment, which is equivalent to dividing the plurality of first effective pulse signals S1 corresponding to the pixel circuit row 80 into three types according to the pulse width, wherein the pulse width corresponding to the first type of pulse signal S11 is the largest, the pulse width corresponding to the second type of pulse signal S12 is in the middle, and the pulse width corresponding to the third type of pulse signal S13 is the smallest. Correspondingly, the output currents of different pixel driving circuits 00 in the pixel circuit row 80 are also divided into three types, wherein the current value corresponding to the first type of current is the largest, the current value corresponding to the second type of current is in the middle, and the current value corresponding to the third type of current is the smallest. Please combine the following table, assuming that different pixel driving circuits 00 in a pixel circuit row 80 simultaneously output the above three gear currents, and these currents are modulated by the above three-gear first effective pulse signals S1, the following three situations will exist:

[0071] The first type of current, i.e. the large current, the pixel driving circuit 00 can complete the charging of the internal parasitic capacitor of the corresponding light emitting element D0 and charge the anode Anode voltage of the light emitting element D0 to be greater than the preset voltage value required for the light emitting element D0 to emit light within the time corresponding to the above three-gear first effective pulse signal S1.

[0072] The second type of current, i.e. the medium current, the pixel driving circuit 00 can complete the charging of the internal parasitic capacitor of the corresponding light emitting element D0 and charge the anode Anode voltage of the light emitting element D0 to be greater than the preset voltage value required for the light emitting element D0 to emit light within the time corresponding to the first type of pulse signal S11 and the second type of pulse signal S12. Since the pulse width of the third type of pulse signal S13 is small, the charging time is short, and the corresponding light emitting element D0 does not emit light. In this way, the light emitting time of the light emitting element D0 receiving the second type of current can be modulated by the first type of pulse signal S11 and the second type of pulse signal S12.

[0073] The third type of current, i.e. the small current, the pixel driving circuit 00 can complete the charging of the internal parasitic capacitor of the corresponding light emitting element D0 and charge the anode Anode voltage of the light emitting element D0 to be greater than the preset voltage value required for the light emitting element D0 to emit light within the time corresponding to the first type of pulse signal S11. Since the pulse widths of the second type of pulse signal S12 and the third type of pulse signal S13 are small, the charging time is shorter than that of the first type of pulse signal S11, and the corresponding light emitting element D0 does not emit light. In this way, the light emitting time of the light emitting element D0 receiving the third type of current is modulated by the first type of pulse signal S11. At this time, the gray scale of the light emitting element D0 receiving the third type of current can be made lower to improve the contrast of the display panel.

[0074] Light emitting state table 1

[0075]

[0076] Figure 14 Fig. 6 shows another timing diagram of the light-emitting control signal, the reset control signal and the pre-charge control signal corresponding to the Nth pixel circuit row, Figure 15 Fig. 7 shows a timing diagram of the anode voltage variation of the light-emitting element under different currents after the pre-charge module is introduced, Figure 16 Fig. 8 shows another timing diagram of the anode voltage variation of the light-emitting element under different currents after the pre-charge module is introduced, please refer to Figure 5 、 Figure 7 、 Figure 14 、 Figure 15 and Figure 16 In an optional embodiment of the present disclosure, the pixel driving circuit 00 is further configured to receive a pre-charge control signal PCG, the pre-charge control signal PCG comprising N third active pulse signals S3; each pulse period H0 further comprises a third active pulse signal S3, and the third active pulse signal S3 is located between the first active pulse signal S1 and the second active pulse signal S2 in each pulse period; the light-emitting element D0 receiving the second type of current emits light in response to the third type of pulse signal S13; and / or the pixel driving circuit 00 receiving the third type of current emits light in response to the second type of pulse signal S12 or the third type of pulse signal S13.

[0077] When the pre-charge module 10 is introduced into the pixel driving circuit 00, after the anode Anode of the light-emitting element D0 is reset, and before the first active pulse signal S1 is sent to the first light-emitting control transistor T7, the pre-charge control signal PCG is used to turn on the pre-charge module 10 to pre-charge the anode Anode of the light-emitting element D0, so as to increase the potential of the anode Anode of the light-emitting element D0. After receiving the first active pulse signal S1 subsequently, the potential of the anode Anode of the light-emitting element D0 can be increased to the potential for emitting light in a short time, that is, the time from receiving the first active pulse signal S1 to the light-emitting element D0 stably emitting light can be saved. At this time, for the light-emitting element D0 with lower gray scale requirement, after receiving the second type of pulse signal S12 or the third type of pulse signal S13 with smaller pulse width, although the charging time of the anode Anode of the light-emitting element D0 in the light-emitting stage is shortened, since the light-emitting element D0 enters the stable light-emitting stage for a short time, the light-emitting element D0 receiving the second type of current can emit light in response to the third type of pulse signal S13; the pixel driving circuit 00 receiving the third type of current can emit light in response to the second type of pulse signal S12 or the third type of pulse signal S13, and the middle gray scale or low gray scale requirement of these light-emitting elements D0 can still be met.

[0078] Please combine the following table, assuming that a pixel circuit row 80 in different pixel drive circuit 00 output current of the above three gears, these currents are modulated by the above three gears first effective pulse signal S1, there will be three cases as follows:

[0079] The first type of current, that is, the case of large current, the pixel drive circuit 00 can complete the charging of the corresponding internal parasitic capacitor of the light emitting element D0 in the time corresponding to the above three gears first effective pulse signal S1 and can charge the anode Anode voltage of the light emitting element D0 to be greater than the preset voltage value required for the light emitting element D0 to emit light. Moreover, due to the introduction of the pre-charge module, the time from receiving the first effective pulse control signal to the stable light emitting of the light emitting element D0 is effectively shortened.

[0080] The second type of current, that is, the case of medium current, the pixel drive circuit 00 can complete the charging of the corresponding internal parasitic capacitor of the light emitting element D0 in the time corresponding to the above first type pulse signal S11 and second type pulse signal S12 and can charge the anode Anode voltage of the light emitting element D0 to be greater than the preset voltage value required for the light emitting element D0 to emit light. And because of the introduction of the pre-charge module, even if the pulse width of the third type pulse signal S13 is small and the charging time is short, the anode Anode potential of the light emitting element D0 can be raised by the pre-charge module. The voltage value of the pre-charge voltage signal provided by the pre-charge module to the anode Anode of the light emitting element D0 can be determined to determine the time from receiving the first light emitting control signal EM to the stable light emitting of the light emitting element D0. Therefore, for the light emitting element D0 receiving the second type of current, if the voltage value of the pre-charge voltage signal is large, the start-up time is relatively short, and it can emit light when receiving the third type pulse signal S13; if the voltage value of the pre-charge voltage signal is small, the start-up time is relatively long, and it cannot emit light when receiving the third pulse signal. In this way, the light emitting time of the light emitting element D0 receiving the second type of current can be modulated by the first type pulse signal S11 and the second type pulse signal S12, and whether it can emit light in response to the third type pulse signal S13 can be determined according to the voltage value of the pre-charge voltage.

[0081] The third type of current, i.e. small current, the pixel driving circuit 00 can complete the charging of the internal parasitic capacitor of the corresponding light emitting element D0 in the time corresponding to the first type of pulse signal S11 and can charge the anode voltage of the light emitting element D0 to a value greater than the preset voltage required for the light emitting element D0 to emit light. Due to the introduction of the pre-charging module 10, even if the pulse width of the second type of pulse signal S12 and the third type of pulse signal S13 is smaller than the pulse width of the first type of pulse signal S11, the charging time is short, but the anode potential of the light emitting element D0 has been raised by the pre-charging module, and the voltage value of the pre-charge voltage signal provided by the pre-charging module to the anode of the light emitting element D0 can be determined to determine the time from receiving the first light emitting control signal EM to the light emitting element D0 stably emitting light. Therefore, for the light emitting element D0 receiving the third type of current, if the voltage value of the pre-charge voltage signal is large, the start-up time is relatively short, and it can emit light when receiving the second type of pulse signal S12 or the third type of pulse signal S13; if the voltage value of the pre-charge voltage signal is small, the start-up time is relatively long, and it cannot emit light when receiving the second type of pulse signal S12 or the third type of pulse signal. In this way, the light emitting time of the light emitting element D0 receiving the third type of current can be modulated by the first type of pulse signal S11, and whether it can emit light in response to the second type of pulse signal S12 and the third type of pulse signal S13 can be determined according to the voltage value of the pre-charge voltage. That is, the size of the voltage value of the pre-charge voltage signal can be used to determine whether the light emitting element D0 corresponding to the small current emits light, thereby improving the modulation accuracy.

[0082] Table 2

[0083]

[0084] Based on the same inventive concept, the present disclosure provides a display device, Figure 17 The display device 200 provided by the embodiment of the present disclosure can be a tablet computer, a mobile phone, a television, a vehicle-mounted display device or any electronic device with display function. The display device 200 provided by the embodiment of the present disclosure has the beneficial effects of the display panel 100 provided by the embodiment of the present disclosure. For specific description of the display panel 200, please refer to the specific description of the display panel 200 in the above embodiments, which will not be repeated here.

[0085] It can be understood that, Figure 17 The display device is only schematically shown in a rectangular structure, in some other embodiments of the present disclosure, the display device 200 can also be embodied as a rounded rectangular, a circular, an elliptical or any other feasible shape, which is not limited in the present disclosure.

[0086] It should be noted that, in this document, the terms "first" and "second" and the like are used merely to distinguish one entity or action from another, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises... " does not, without more limitations, preclude the existence of further identical elements in the process, method, article, or apparatus that comprises the recited element.

[0087] The above description is merely that of the specific implementations of the present disclosure, to enable a person skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.< / n> ​​< / n> < / n> < / n> < / n> < / n>

Claims

1. A pixel driving circuit for electrically connecting with a light emitting element, characterized by, The pixel driving circuit comprises a first light-emitting control transistor and a pre-charge module, a first electrode of the first light-emitting control transistor is coupled with a first power voltage terminal, a second electrode of the first light-emitting control transistor is electrically connected with an anode of the light-emitting element, a gate electrode of the first light-emitting control transistor is connected with a light-emitting control signal terminal, and a cathode of the light-emitting element is connected with a second power voltage terminal. A first end of the pre-charge module is connected with a pre-charge voltage terminal, a second end of the pre-charge module is connected with the anode of the light-emitting element, and a control terminal of the pre-charge module is connected with a pre-charge control signal terminal.

2. The pixel driving circuit according to claim 1, characterized in that, The pixel driving circuit further comprises a first reset transistor, a first electrode of the first reset transistor is connected with a first reset signal terminal, a second electrode of the first reset transistor is connected with the anode of the light-emitting element, and a gate electrode of the first reset transistor is connected with a reset control signal terminal.

3. The pixel driving circuit of claim 2, wherein, A voltage value of the pre-charge voltage terminal is greater than a voltage value of the first reset signal terminal.

4. The pixel driving circuit of claim 2, wherein, The voltage value of the pre-charge voltage terminal is less than a turn-on voltage value of the light-emitting element.

5. The pixel driving circuit of claim 1, wherein, The pre-charge module comprises a pre-charge transistor, a first electrode of the pre-charge transistor is connected with the pre-charge voltage terminal, a second electrode of the pre-charge transistor is connected with the anode of the light-emitting element, and a gate electrode of the pre-charge transistor is connected with the pre-charge control signal terminal.

6. The pixel driving circuit of claim 1, wherein, The pixel driving circuit further comprises a driving transistor and a second reset transistor, a first electrode of the driving transistor is coupled with the first power voltage terminal, a second electrode of the driving transistor is electrically connected with the first electrode of the first light-emitting control transistor, a first electrode of the second reset transistor is connected with a second reset signal terminal, a second electrode of the second reset transistor is connected with a gate electrode of the driving transistor, and a gate electrode of the second reset transistor is connected with a first control terminal.

7. The pixel driving circuit of claim 6, wherein, The pixel driving circuit further comprises a data write transistor and a threshold compensation transistor, a first electrode of the data write transistor is connected with a data signal terminal, a second electrode of the data write transistor is connected with the first electrode of the driving transistor, and a gate electrode of the data write transistor is connected with a second control terminal; a first electrode of the threshold compensation transistor is connected with a second electrode of the driving transistor, a second electrode of the threshold compensation transistor is connected with the gate electrode of the driving transistor, and a gate electrode of the threshold compensation transistor is connected with the second control terminal.

8. The pixel driving circuit of claim 6, wherein, The pixel driving circuit further comprises a second light-emitting control transistor, a first electrode of the second light-emitting control transistor is connected with the first power voltage terminal, a second electrode of the second light-emitting control transistor is connected with the first electrode of the driving transistor, and a gate electrode of the second light-emitting control transistor is connected with the light-emitting control signal terminal.

9. A display panel, characterized by, The display panel comprises the pixel driving circuit according to any one of claims 1 to 8.

10. A display device, characterized by comprising: The display panel comprises the pixel driving circuit according to claim 9.

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