Light-emitting driving circuit and display panel

Abstract

The utility model discloses a light-emitting driving circuit and a display panel, the light-emitting driving circuit comprises a plurality of shift registers, and the nth shift register comprises a pull-up control transistor, a pull-up transistor and a first capacitor. The pull-up transistor can be controlled to be opened through a low-potential signal provided by the pull-up control transistor, and compared with a mode of controlling an N-channel type pull-up transistor to be opened through a high-potential signal, due to the fact that the potential for controlling the pull-up transistor to be opened is lower, the driving power consumption of the pull-up transistor is reduced, and the power consumption is reduced. Especially under the condition that the pull-up transistor needs to be opened for a long time; meanwhile, when the P-channel type pull-up transistor is opened by adopting a low-potential signal, even if the pull-up transistor is aged for a long time or the grid electrode of the pull-up transistor leaks electricity, the working stability is not influenced, and the service life can be prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light-emitting driving circuit and a display panel. Background Art

[0002] As people's tastes improve, higher requirements are placed on panel specifications, such as high refresh rate, high resolution, and long life. Compared with the use of flip film fixed gate driver chip (Gate COF), array substrate row driver (GOA) technology has great advantages in cost and functionality, so it has become the focus of panel development.

[0003] Among them, in a self-luminous display panel, a compensation control signal, a scan signal, an initialization control signal provided by a scan driving circuit, and a light emitting control signal provided by a light emitting driving circuit are usually required to jointly drive the pixel circuit.

[0004] However, the driving power consumption required by the light-emitting driving circuit has long been high, and the working stability is not high, which urgently needs to be optimized. Utility Model Content

[0005] The present application provides a light-emitting driving circuit and a display panel to alleviate the technical problems of high power consumption and low working stability.

[0006] In a first aspect, the present application provides a light-emitting driving circuit, which includes multiple shift registers, wherein the n-th stage shift register includes a pull-up control transistor, a pull-up transistor and a first capacitor, the first electrode of the pull-up control transistor is connected to the first low potential line, the gate of the pull-up control transistor is connected to the first cascade line, and the pull-up control transistor is an N-channel transistor; the gate of the pull-up transistor is connected to the second electrode of the pull-up control transistor, the first electrode of the pull-up transistor is connected to the first high potential line, the second electrode of the pull-up transistor is connected to the n-th stage light-emitting control line, and the pull-up transistor is a P-channel transistor; one end of the first capacitor is connected to the gate of the pull-up transistor, and the other end of the first capacitor is connected to the second electrode of the pull-up transistor.

[0007] In some embodiments, the n-th stage shift register further includes a pull-down control transistor and a pull-down transistor, the first electrode of the pull-down control transistor is connected to the second high potential line, the gate of the pull-down control transistor is connected to the second cascade line, and the pull-down control transistor is an N-channel transistor; the gate of the pull-down transistor is connected to the second electrode of the pull-down control transistor, the first electrode of the pull-down transistor is connected to the second low potential line, the second electrode of the pull-down transistor is connected to the n-th stage light-emitting control line, and the pull-down transistor is an N-channel transistor.

[0008] In some embodiments, the nth stage shift register also includes a first transistor, the first electrode of the first transistor is connected to the second electrode of the pull-up control transistor, the second electrode of the first transistor is connected to the second high potential line, the gate of the first transistor is connected to the second electrode of the pull-down control transistor, and the first transistor is an N-channel transistor.

[0009] In some embodiments, the nth stage shift register also includes a second transistor, a first electrode of the second transistor is connected to the gate of the pull-down transistor, a second electrode of the second transistor is connected to the first low potential line, a gate of the second transistor is connected to the gate of the pull-up transistor, and the second transistor is a P-channel transistor.

[0010] In some embodiments, the nth stage shift register also includes a third transistor, a first electrode of the third transistor is connected to the gate of the pull-down transistor, a second electrode of the third transistor is connected to the first low potential line, a gate of the third transistor is connected to the first cascade line, and the third transistor is an N-channel transistor.

[0011] In some embodiments, the first low potential line transmits a first low potential signal, the second low potential line transmits a second low potential signal, and the potential of the first low potential signal is lower than that of the second low potential signal.

[0012] In some embodiments, the first high potential line transmits a first high potential signal, and the second high potential line transmits a second high potential signal, and a potential of the second high potential signal is higher than a potential of the first high potential signal.

[0013] In some implementations, the first cascade line transmits an (n+3)th cascade signal, and the second cascade line transmits an (n-3)th cascade signal.

[0014] In some embodiments, the pull-up transistor is a low temperature polysilicon thin film transistor.

[0015] In a second aspect, the present application provides a display panel, which includes the above-mentioned n-th level light-emitting driving circuit.

[0016] The light-emitting drive circuit and display panel provided in the present application, by constructing a P-channel pull-up transistor, can control the pull-up transistor to turn on through a low-potential signal provided by the pull-up control transistor. Compared with using a high-potential signal to control the N-channel pull-up transistor to turn on, since the potential for controlling the pull-up transistor to turn on is lower, the driving power consumption of the pull-up transistor is reduced, especially when the pull-up transistor needs to be turned on for a long time; at the same time, when a low-potential signal is used to turn on the P-channel pull-up transistor, even if the pull-up transistor is aged for a long time or its gate leaks, it will not affect the working stability and can also extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0018] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application.

[0019] Figure 2 A schematic diagram of the cascade structure of the light-emitting driving circuit provided in an embodiment of the present application.

[0020] Figure 3 A schematic diagram of the structure of an n-th stage shift register provided in an embodiment of the present application.

[0021] Figure 4 for Figure 3 The timing diagram of the nth stage shift register is shown. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0024] Figure 1 The structure diagram of the display panel provided in the embodiment of the present application is as follows: The display panel includes a scan driving circuit 100, a light emitting driving circuit 200, a timing controller 300, a data driver 400 and a pixel unit 500.

[0025] The pixel unit 500 includes a plurality of pixel circuits 510 distributed in an array. The timing controller 300 can generate a scan drive control signal SCS, a data drive control signal DCS and a source drive signal DS based on an externally provided synchronization signal. The data driver 400 can generate corresponding data signals D1, D2...Dm according to the source drive signal DS, and transmit them to the corresponding pixel circuit 510. The scan drive circuit 100 can generate corresponding compensation control signals R[1]...R[n], scan signals G[1]...G[n], and initialization control signals I[1]...I[n] to the corresponding pixel circuit 510 based on the scan drive control signal SCS. The light emitting drive circuit 200 can generate corresponding light emitting control signals EM[1]...EM[n] to the corresponding pixel circuit 510 based on the scan drive control signal SCS.

[0026] Figure 2 Schematic diagram of the cascade structure of the light-emitting driving circuit 200 provided in an embodiment of the present application. Among them, the scanning driving circuit 100 can also provide multiple cascade signals, such as the n-3th level cascade signal Cout[n-3], the nth level cascade signal Cout[n], the n+3th level cascade signal Cout[n+3], etc. The light-emitting driving circuit 200 may include multiple shift registers, such as the n-3th level shift register 210 for outputting the n-3th level light-emitting control signal EM[n-3], the nth level shift register 220 for outputting the nth level light-emitting control signal EM[n], the n+3th level shift register 230 for outputting the n+3th level light-emitting control signal EM[n+3], etc.

[0027] Exemplarily, the scanning driving circuit 100 can provide the n-3th level cascade signal Cout[n-3] for the n-3th level shift register 220. The scanning driving circuit 100 can also provide the n-3th level shift register 210 and the n+3th level shift register 230 with the n-3th level cascade signal Cout[n]. The scanning driving circuit 100 can also provide the n+3th level cascade signal Cout[n+3] for the n-3th level shift register 220. By analogy, the scanning driving circuit 100 can provide the various required cascade signals for the light-emitting driving circuit 200.

[0028] This embodiment provides a light-emitting driving circuit 200, such as Figure 3As shown, the light-emitting driving circuit 200 includes a plurality of shift registers, wherein the n-th stage shift register 220 includes a pull-up control transistor T11, a pull-up transistor T21 and a first capacitor C1, the first electrode of the pull-up control transistor T11 is connected to the first low potential line, the gate of the pull-up control transistor T11 is connected to the first cascade line, and the pull-up control transistor T11 is an N-channel transistor; the gate of the pull-up transistor T21 is connected to the second electrode of the pull-up control transistor T11, the first electrode of the pull-up transistor T21 is connected to the first high potential line, the second electrode of the pull-up transistor T21 is connected to the n-th stage light-emitting control line, and the pull-up transistor T21 is a P-channel transistor; one end of the first capacitor C1 is connected to the gate of the pull-up transistor T21, and the other end of the first capacitor C1 is connected to the second electrode of the pull-up transistor T21.

[0029] It can be understood that the light-emitting driving circuit 200 provided in the present embodiment, by constructing a P-channel pull-up transistor T21, can control the pull-up transistor T21 to turn on through a low potential signal provided by the pull-up control transistor T11. Compared with using a high potential signal to control the N-channel pull-up transistor T21 to turn on, since the potential for controlling the pull-up transistor T21 to turn on is lower, the driving power consumption of the pull-up transistor T21 is reduced, especially when the pull-up transistor T21 needs to be turned on for a long time; at the same time, when a low potential signal is used to turn on the P-channel pull-up transistor T21, even if the pull-up transistor T21 is aged for a long time or its gate leaks, it will not affect the working stability and can also extend the service life.

[0030] It should be noted that the nth level light emitting control line is used to transmit the nth level light emitting control signal EM[n]. The first low potential line is used to transmit the first low potential signal VGL1. The first high potential line is used to transmit the first high potential signal VGH1. The first cascade line transmits the n+3th level cascade signal Cout[n+3].

[0031] In the present application, the first electrode may be one of the source and the drain, and the second electrode may be the other of the source and the drain. For example, when the first electrode is the source, the second electrode is the drain; or when the first electrode is the drain, the second electrode is the source.

[0032] In the present application, a high potential can turn on an N-channel transistor and turn off a P-channel transistor; a low potential can turn on a P-channel transistor and turn off an N-channel transistor.

[0033] In one embodiment, the pull-up transistor T21 is a low-temperature polysilicon thin film transistor, which has a higher mobility. Therefore, the channel width of the pull-up transistor T21 can be reduced, and the n-th level light emitting control signal EM[n] can be output quickly.

[0034] In one embodiment, the n-th stage shift register 220 further includes a pull-down control transistor T71 and a pull-down transistor T31, wherein the first electrode of the pull-down control transistor T71 is connected to the second high potential line, the gate of the pull-down control transistor T71 is connected to the second cascade line, and the pull-down control transistor T71 is an N-channel transistor; the gate of the pull-down transistor T31 is connected to the second electrode of the pull-down control transistor T71, the first electrode of the pull-down transistor T31 is connected to the second low potential line, the second electrode of the pull-down transistor T31 is connected to the n-th stage light-emitting control line, and the pull-down transistor T31 is an N-channel transistor.

[0035] It should be noted that the second cascade line transmits the n-3 stage cascade signal Cout[n-3]. The second low potential line transmits the second low potential signal VGL2. The potential of the first low potential signal VGL1 is lower than the potential of the second low potential signal VGL2. When the gate of the pull-down transistor T31 is at the potential of the first low potential signal VGL1, the pull-down transistor T31 can be turned off to prevent the leakage current of the pull-down transistor T31 from affecting the stability of the n-stage light emitting control signal EM[n].

[0036] In one embodiment, the n-th stage shift register 220 further includes a first transistor T41, a first electrode of the first transistor T41 is connected to the second electrode of the pull-up control transistor T11, a second electrode of the first transistor T41 is connected to the second high potential line, a gate of the first transistor T41 is connected to the second electrode of the pull-down control transistor T71, and the first transistor T41 is an N-channel transistor.

[0037] It should be noted that the second high potential line transmits a second high potential signal VGH2 whose potential is higher than that of the first high potential signal VGH1 , which can prevent the pull-up node Q[n] from leaking through the first transistor T41 when the first transistor T41 is turned off.

[0038] The first transistor T41 and the pull-down control transistor T71 can share the same second high potential line, thereby saving the number of transmission lines required by the light-emitting driving circuit 200 and reducing the occupied space of the frame.

[0039] In one embodiment, the n-th stage shift register 220 further includes a second transistor T51, a first electrode of the second transistor T51 is connected to the gate of the pull-down transistor T31, a second electrode of the second transistor T51 is connected to the first low potential line, a gate of the second transistor T51 is connected to the gate of the pull-up transistor T21, and the second transistor T51 is a P-channel transistor.

[0040] It can be understood that by constructing a P-channel second transistor T51, the second transistor T51 can be controlled to turn on by a low potential signal provided by the pull-up control transistor T11. Compared with using a high potential signal to control the N-channel second transistor T51 to turn on, the potential for controlling the second transistor T51 to turn on is lower, thereby reducing the driving power consumption of the second transistor T51, especially when the second transistor T51 needs to be turned on for a long time; at the same time, when a low potential signal is used to turn on the P-channel second transistor T51, even if the second transistor T51 is aged for a long time or its gate leaks, it will not affect the working stability and can also extend the service life.

[0041] The second transistor T51 and the pull-up control transistor T11 can share the same first low potential line, thereby saving the number of transmission lines required by the light-emitting driving circuit 200 and reducing the occupied space of the frame.

[0042] In one embodiment, the n-th stage shift register 220 further includes a third transistor T61, a first electrode of the third transistor T61 is connected to the gate of the pull-down transistor T31, a second electrode of the third transistor T61 is connected to the first low potential line, a gate of the third transistor T61 is connected to the first cascade line, and the third transistor T61 is an N-channel transistor.

[0043] It should be noted that the third transistor T61 can pull down the potential of the pull-down node QB[n] to the potential of the first low potential signal VGL1 when the n+3th stage cascade signal Cout[n+3] is at a high potential.

[0044] Wherein, each of the above-mentioned N-channel transistors can be a low-temperature polysilicon or indium gallium zinc oxide thin film transistor.

[0045] The third transistor T61 and the pull-up control transistor T11 can share the same first low potential line, thereby saving the number of transmission lines required by the light-emitting driving circuit 200 and reducing the occupied space of the frame.

[0046] Figure 4 for Figure 3 The timing diagram of the n-th stage shift register 220 is shown as follows:

[0047] When the n-3rd-level cascade signal Cout[n-3] is at a high potential, the pull-down control transistor T71 is turned on, the potential of the pull-down node QB[n] is the potential of the second high potential signal VGH2, the first transistor T41 and the pull-down transistor T31 are both turned on, the potential of the pull-up node Q[n] is the potential of the second high potential signal VGH2, and the pull-up transistor T21 and the second transistor T51 are both turned off; when the n+3rd-level cascade signal Cout[n+3] is at a low potential, the pull-up control transistor T11 and the third transistor T61 are both turned off, and the pull-down transistor T31 outputs the second low potential signal VGL2 as the low potential nth-level light-emitting control signal EM[n] to turn on the light-emitting control transistor in the pixel circuit 510 so that the pixel circuit 510 starts to emit light.

[0048] When the n+3th level cascade signal Cout[n+3] is at a high potential, the pull-up control transistor T11 and the third transistor T61 are both turned on, and the potential of the pull-up node Q[n] and the potential of the pull-down node QB[n] are both the potential of the first low potential signal VGL1, then the first transistor T41 and the pull-down transistor T31 are both turned off; the pull-up transistor T21 is turned on, and the first high potential signal VGH1 is output as the high potential nth level light emitting control signal EM[n] to turn off the light emitting control transistor in the pixel circuit 510 and control the pixel circuit 510 not to emit light.

[0049] Among them, in one frame, the n-th level light-emitting control signal EM[n] is at a high potential except for the duration when it is at a low potential. Therefore, the high potential duration of the n-th level light-emitting control signal EM[n] in one frame is longer, which is an improvement of the present application and is also more conducive to saving power consumption, improving stability and extending service life.

[0050] It should be noted that the present application adopts a design in which a low potential signal is used to turn on a P-channel transistor and a high potential signal is used to turn on an N-channel transistor. Even if the transistor is aged for a long time or leaks electricity, the operation of the light-emitting driving circuit 200 is not affected. For example, if the potential of the pull-up node Q[n] is slightly raised, the high potential output of the n-th level light-emitting control signal EM[n] can still be ensured; or if the potential of the pull-down node QB[n] is slightly decreased, the low potential output of the n-th level light-emitting control signal EM[n] can also be ensured, which extends the service life of the light-emitting driving circuit 200.

[0051] Among them, since the first high potential signal VGH1, the second high potential signal VGH2, the first low potential signal VGL1 and the second low potential signal VGL2 can all be provided by the charge pump in the display panel, therefore, when the high potential and the low potential of each cascade signal are respectively the potential of the second high potential signal VGH2 and the potential of the first low potential signal VGL1, some output ends of the charge pump can be shared, thereby saving the number of output ends of the charge pump.

[0052] In one embodiment, the present embodiment provides a display panel, and the display panel includes the above-mentioned light emitting driving circuit 200 .

[0053] It can be understood that, since the display panel provided in this embodiment includes the above-mentioned light-emitting driving circuit 200, it is also possible to construct a P-channel pull-up transistor T21, and the pull-up transistor T21 can be controlled to turn on by a low potential signal provided by the pull-up control transistor T11. Compared with using a high potential signal to control the N-channel pull-up transistor T21 to turn on, since the potential for controlling the pull-up transistor T21 to turn on is lower, the driving power consumption of the pull-up transistor T21 is reduced, especially when the pull-up transistor T21 needs to be turned on for a long time; at the same time, when a low potential signal is used to turn on the P-channel pull-up transistor T21, even if the pull-up transistor T21 is aged for a long time or its gate leaks, it will not affect the working stability and can also extend the service life.

[0054] Among them, the display panel can be a self-luminous display panel, and the self-luminous display panel can be exemplarily an organic light emitting diode display panel, a micro light emitting diode display panel, a mini light emitting diode display panel or a quantum dot light emitting diode display panel.

[0055] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0056] The light-emitting driving circuit 200 and the display panel provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A light-emitting driving circuit, characterized in that: The light-emitting driving circuit includes a plurality of shift registers, wherein the n-th stage shift register includes: A pull-up control transistor, wherein a first electrode of the pull-up control transistor is connected to a first low potential line, a gate of the pull-up control transistor is connected to a first cascade line, and the pull-up control transistor is an N-channel transistor; A pull-up transistor, wherein the gate of the pull-up transistor is connected to the second electrode of the pull-up control transistor, the first electrode of the pull-up transistor is connected to the first high potential line, the second electrode of the pull-up transistor is connected to the n-th level light emitting control line, and the pull-up transistor is a P-channel transistor; A first capacitor, one end of the first capacitor is connected to the gate of the pull-up transistor, and the other end of the first capacitor is connected to the second electrode of the pull-up transistor.

2. The light-emitting driving circuit according to claim 1, characterized in that: The n-th stage shift register further includes: a pull-down control transistor, wherein a first electrode of the pull-down control transistor is connected to a second high potential line, a gate of the pull-down control transistor is connected to a second cascade line, and the pull-down control transistor is an N-channel transistor; A pull-down transistor, wherein the gate of the pull-down transistor is connected to the second electrode of the pull-down control transistor, the first electrode of the pull-down transistor is connected to the second low potential line, the second electrode of the pull-down transistor is connected to the n-th level light emitting control line, and the pull-down transistor is an N-channel transistor.

3. The light-emitting driving circuit according to claim 2, characterized in that: The n-th stage shift register also includes a first transistor, a first electrode of the first transistor is connected to the second electrode of the pull-up control transistor, the second electrode of the first transistor is connected to the second high potential line, and a gate of the first transistor is connected to the second electrode of the pull-down control transistor. The first transistor is an N-channel transistor.

4. The light-emitting driving circuit according to claim 3, characterized in that: The n-th stage shift register also includes a second transistor, a first electrode of the second transistor is connected to the gate of the pull-down transistor, a second electrode of the second transistor is connected to the first low potential line, a gate of the second transistor is connected to the gate of the pull-up transistor, and the second transistor is a P-channel transistor.

5. The light-emitting driving circuit according to claim 4, characterized in that: The n-th stage shift register also includes a third transistor, a first electrode of the third transistor is connected to the gate of the pull-down transistor, a second electrode of the third transistor is connected to the first low potential line, a gate of the third transistor is connected to the first cascade line, and the third transistor is an N-channel transistor.

6. The light-emitting driving circuit according to claim 2, characterized in that: The first low potential line transmits a first low potential signal, and the second low potential line transmits a second low potential signal. The potential of the first low potential signal is lower than that of the second low potential signal.

7. The light-emitting driving circuit according to claim 2, characterized in that: The first high potential line transmits a first high potential signal, and the second high potential line transmits a second high potential signal, wherein a potential of the second high potential signal is higher than a potential of the first high potential signal.

8. The light-emitting driving circuit according to claim 2, characterized in that: The first cascade line transmits an n+3th level cascade signal, and the second cascade line transmits an n-3th level cascade signal.

9. The light-emitting driving circuit according to any one of claims 1 to 8, characterized in that: The pull-up transistor is a low-temperature polysilicon thin film transistor.

10. A display panel, characterized in that: The display panel comprises the n-th level light-emitting driving circuit as described in any one of claims 1 to 9.

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