CN115953985B

CN115953985B - Pixel unit, display panel and display device

Info

Publication number: CN115953985B
Application number: CN202211698124.2A
Authority: CN
Inventors: 王惠奇; 周仁杰; 康报虹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-11-17
Anticipated expiration: 2042-12-28
Also published as: CN115953985A

Abstract

The application relates to a pixel unit, a display panel and a display device. The charging unit of the pixel unit receives and under the control of the scanning signal receives the data signal to store the electric energy, and outputs an opening signal to the conduction unit according to the stored electric energy. When the received data signal and the received power signal are both at the first potential and the received opening signal is larger than the reference signal, the control unit of the pixel unit outputs a conducting signal at the first potential to the conducting unit. The conduction unit is used for receiving and selectively transmitting the power supply signal to the light-emitting unit according to the conduction signal, the starting signal and the light-emitting signal. The light emitting unit receives and emits light under the drive of the power supply signal. In the pixel unit, only when the data signal, the power signal and the opening signal reach the working values, the power signal can be transmitted to the light-emitting unit to control the light-emitting unit to emit light, so that the problem that abnormal phenomena such as flickering occur in a display picture due to abnormal signal time sequence is avoided.

Description

Pixel unit, display panel and display device

Technical Field

The present application relates to the field of display technologies, and in particular, to a pixel unit, a display panel having the pixel unit, and a display device having the display panel.

Background

An Organic Light-Emitting Diode (OLED) display panel can meet new requirements of consumers on display technology by virtue of its advantages of being lighter and thinner, low in power consumption, good in flexibility, and the like, and thus is widely applied to various display devices.

However, when the OLED display panel is turned on or off, the on/off timing is easily abnormal due to factors such as data voltage timing error, driving voltage timing error, incomplete static electricity discharge, etc., so that phenomena such as flicker, abnormal picture, etc. occur when the OLED display panel is turned on or off.

Therefore, how to solve the problem of abnormal switching on/off time sequence caused by voltage time sequence error, static electricity unreleased and other factors when the OLED display panel is switched on/off is a urgent need for those skilled in the art.

Disclosure of Invention

In view of the shortcomings of the prior art, the application aims to provide a pixel unit, a display panel and a display device. Only when the data signal, the power signal and the opening signal all reach the working values, the power signal can be transmitted to the light-emitting unit to control the light-emitting unit to emit light, so that the problem that abnormal phenomena such as flickering occur in a display picture due to abnormal signal time sequence is avoided.

In a first aspect, the present application provides a pixel unit, where the pixel unit includes a light emitting unit, a charging unit, a conducting unit, and a control unit, where the charging unit, the light emitting unit, and the control unit are all electrically connected to the conducting unit, and the charging unit is configured to receive a scan signal and receive a data signal under control of the scan signal to store electric energy, and output an opening signal to the conducting unit according to the stored electric energy; the control unit is used for receiving the data signal, the power signal, the opening signal and the reference signal, and outputting a conduction signal at a first potential to the conduction unit when the data signal and the power signal are at the first potential and the opening signal is larger than the reference signal; the conduction unit is used for receiving a light-emitting signal and the power supply signal and selectively transmitting the power supply signal to the light-emitting unit according to the conduction signal, the starting signal and the light-emitting signal; the light-emitting unit receives the power supply signal and emits light under the drive of the power supply signal.

In some embodiments, the control unit includes a first selection circuit, a second selection circuit, and a comparison circuit, where a control end of the first selection circuit receives the data signal, a first end of the first selection circuit receives the power signal, a second end of the first selection circuit is electrically connected to a control end of the second selection circuit, and the first selection circuit is configured to be in an on state or an off state under control of the data signal, so as to selectively transmit the power signal to the second selection circuit; the first end of the second selection circuit receives the opening signal, the second end of the second selection circuit is electrically connected to the normal phase input end of the comparison circuit, the reverse phase input end of the comparison circuit receives the reference signal, the output end of the comparison circuit is electrically connected to the conducting unit, the second selection circuit is used for being in a conducting state or a disconnecting state under the control of the power signal so as to selectively transmit the opening signal to the normal phase input end of the comparison circuit, and the comparison circuit outputs a corresponding conducting signal to the conducting unit from the output end of the comparison circuit according to the comparison result of the opening signal and the reference signal.

In some embodiments, the conducting unit includes a first conducting circuit, a second conducting circuit and a third conducting circuit, where the first conducting circuit is electrically connected to the charging unit, the second conducting circuit and the third conducting circuit, and the first conducting circuit is configured to receive the turn-on signal transmitted by the charging unit and is in a turned-on or turned-off state according to the turn-on signal, so as to selectively turn on or turn off between the second conducting circuit and the third conducting circuit; the second conduction circuit is electrically connected to the control unit, and is used for receiving the power supply signal, the light-emitting signal and the conduction signal transmitted by the control unit, and is selectively in a conduction state or a disconnection state according to the light-emitting signal and the conduction signal; the third conduction circuit is electrically connected to the charging unit, the second conduction circuit, the control unit and the light-emitting unit, and is used for receiving the light-emitting signal and the conduction signal transmitted by the control unit, and is selectively in a conduction state or a disconnection state according to the light-emitting signal and the conduction signal.

In some embodiments, the first conduction circuit includes a first conduction switch, a control end of the first conduction switch is electrically connected to the charging unit, and is configured to receive the start signal from the charging unit; the first end of the first communication switch is electrically connected to the second conduction circuit, and the second end of the first communication switch is electrically connected to the third conduction circuit; the second communication circuit comprises a second communication switch and a first communication circuit, the control end of the second communication switch is electrically connected with the output end of the first communication circuit, the first end of the second communication switch is used for receiving the power signal, the second end of the second communication switch is electrically connected to the first end of the first communication switch, the first input end of the first communication circuit is used for receiving the luminous signal, the second input end of the first communication circuit is electrically connected to the third communication circuit and the output end of the comparison circuit, the second input end of the first communication circuit is used for receiving the communication signal transmitted by the output end of the comparison circuit, and the first communication circuit outputs a corresponding communication signal to the control end of the second communication switch from the output end of the first communication circuit according to the received communication signal and the luminous signal so as to control the second communication switch to be in a conducting state or a disconnecting state; the third communication circuit comprises a third communication switch and a second communication circuit, the control end of the third communication switch is electrically connected with the output end of the second communication circuit, the first end of the third communication switch is electrically connected with the charging unit and the second end of the first communication switch, the second end of the third communication switch is electrically connected to the light emitting unit, the first input end of the second communication circuit is used for receiving the light emitting signal, the second input end of the second communication circuit is electrically connected to the second input end of the first communication circuit and the output end of the comparison circuit, the second input end of the second communication circuit is used for receiving the conduction signal transmitted by the output end of the comparison circuit, and the second communication circuit outputs the corresponding communication signal to the control end of the third communication switch according to the received conduction signal and the light emitting signal so as to control the third communication switch to be in a conduction state or a disconnection state.

In some embodiments, when the first, second and third communication switches are all in an on state, the power signal is transmitted to the light emitting element through the second, first and third communication switches, and the light emitting element receives the power signal to emit light.

In some embodiments, the pixel unit further includes a discharge unit electrically connected to the control unit and the light emitting unit, the control unit selectively outputs the turn-on signal at a second potential to the discharge unit according to the received data signal, and the discharge unit discharges the charge of the light emitting unit according to the turn-on signal at the second potential.

In some embodiments, the discharge unit includes a first discharge path and a second discharge path, wherein the first discharge path is electrically connected to the light emitting unit, the output terminal of the comparison circuit, and the ground terminal, and the second discharge path is electrically connected to the light emitting unit, the output terminal of the comparison circuit, and the ground terminal; the first discharging path receives the conducting signal from the output end of the comparison circuit and selectively conducts the light-emitting unit and the grounding end according to the conducting signal; the second discharging path receives the conducting signal from the output end of the comparison circuit, and selectively conducts the light emitting unit and the grounding end according to the conducting signal.

In some embodiments, the first discharging path includes a first discharging switch and a first discharging resistor, wherein a control end of the first discharging switch is electrically connected to an output end of the comparing circuit, and is configured to receive the on signal from the output end of the comparing circuit, a first end of the first discharging switch is electrically connected to a first end of the light emitting unit, a second end of the first discharging switch is electrically connected to a first end of the first discharging resistor, and a second end of the first discharging resistor is electrically connected to the ground; the second discharging path comprises a second discharging switch and a second discharging resistor, wherein a control end of the second discharging switch is electrically connected to an output end of the comparison circuit and is used for receiving the conducting signal from the output end of the comparison circuit, a first end of the second discharging switch is electrically connected to a second end of the light emitting unit, a second end of the second discharging switch is electrically connected to a first end of the second discharging resistor, and a second end of the second discharging resistor is electrically connected to the grounding end.

In a second aspect, the present application provides a display panel, where the display panel includes a driving circuit and a plurality of the pixel units, and the driving circuit is configured to drive the plurality of the pixel units to emit light.

In a third aspect, the present application provides a display device, where the display device includes a power module and the display panel, and the power module is configured to provide a power supply voltage for displaying images on the display panel.

In summary, in the pixel unit, the display panel and the display device of the present application, by setting the control unit, the potential conditions of the data signal, the power signal and the on signal are determined, and only when the data signal, the power signal and the on signal all reach the working values, the control unit outputs the on signal at the first potential to the on unit, so that the power signal can be transmitted to the light emitting unit through the on unit to control the light emitting unit to emit light, thereby avoiding the problem that the display panel has abnormal phenomena such as flickering due to abnormal time sequence when the data signal, the power signal and the on signal reach the working values, and improving the display effect of the display panel and the user experience. For example, when the display panel is turned off for display, the data signal is controlled to be at the second potential, and even if other signal timing sequences are abnormal, the control unit outputs a conducting signal at the second potential to the conducting unit, so that the transmission of the power signal to the light emitting unit is stopped, the light emitting element is turned off at the fastest speed, and the influence of the mistaken light emission of the light emitting unit on the display effect is avoided.

In addition, through setting up discharge unit, can with the remaining electric charge transmission of luminescent unit extremely the earth terminal releases to avoided display panel when the switch-on and switch-off residual electric charge to cause luminescent unit mistake is luminous, and then lead to display panel to appear the screen and twinkle, the unusual scheduling problem of picture, promoted display panel's display effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a display panel of the display device shown in FIG. 1;

fig. 3 is a schematic structural diagram of a pixel unit according to an embodiment of the present application;

fig. 4 is a schematic diagram of a specific circuit structure of the pixel unit shown in fig. 3.

Reference numerals illustrate:

1000-a display device; 200-a display panel; 300-a power module; 400-supporting frames; 210-a non-display area; 220-a display area; 30-a light emitting unit; a 100-pixel unit; 10-a charging unit; a 20-turn-on unit; 50-a control unit; a 60-discharge unit; 11-a switching circuit; 14-a memory circuit; 22-a first conduction circuit; 24-a second conduction circuit; 26-a third conduction circuit; 24 a-a second communication switch; 24 b-a first communication circuit; 26 a-a third communication switch; 26 b-a second communication circuit; 51-a first selection circuit; 52-a second selection circuit; 53-a comparison circuit; 62-a first discharge path; 62 a-a first discharge switch; 62 b-a first discharge resistor; 64-a second discharge path; 64 a-a second discharge switch; 64 b-a second discharge resistor; scan-Scan signal; vdata-data signal; vdd-power signal; VGH-on signal; vref-reference signal; emit-luminescent signal.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. It will also be understood that the meaning of "at least one" as described herein is one and more, such as one, two or three, etc., and the meaning of "a plurality" is at least two, such as two or three, etc., unless specifically defined otherwise. The terms "step 1", "step 2", and the like in the description and claims of the present application and in the drawings, are used for distinguishing between different objects and not for describing a particular sequential order.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device 1000 according to an embodiment of the application. As shown in fig. 1, in the embodiment of the application, the display device 1000 includes a display panel 200, a power module 300 and a supporting frame 400, wherein the display panel 200 and the power module 300 are fixed on the supporting frame 400, and the power module 300 is disposed on the back surface of the display panel 200, that is, the power module 300 is disposed on the non-display surface of the display panel 200. The power module 300 is configured to provide a power voltage for displaying images on the display panel 200, and the support frame 400 provides fixing and protecting functions for the display panel 200 and the power module 300.

It is understood that the display device 1000 may be used in electronic devices including, but not limited to, tablet computers, notebook computers, desktop computers, and the like. According to the embodiment of the present application, the specific type of the display device 1000 is not particularly limited, and a person skilled in the art can correspondingly design according to the specific use requirement of the application of the display device 1000, which is not described herein.

In an exemplary embodiment, the display device 1000 may further include other necessary components and components such as a driving board, a power board, a high-voltage board, and a key control board, which can be correspondingly supplemented by those skilled in the art according to the specific type and actual function of the display device 200, and will not be described herein.

In an embodiment of the present application, the display device 1000 may be an Organic Light-Emitting Diode (OLED) display device, a liquid crystal display (Liquid Crystal Display, LCD), or the like, which is not particularly limited in the present application.

Referring to fig. 2, fig. 2 is a schematic structural diagram of a display panel 200 in the display device 1000 shown in fig. 1. As shown in fig. 2, in an embodiment of the present application, the display panel 200 includes a non-display area 210 and a display area 220. The display area 220 is used for displaying images, the non-display area 210 is at least partially surrounding the periphery of the display area 220 and is not used for displaying images, and the non-display area 210 is used for setting a corresponding driving circuit to control the display area 220 to realize image display.

It is to be understood that, in some embodiments, the display panel 200 may use a liquid crystal material as a display medium, which is not limited thereto.

In the embodiment of the present application, the display panel 200 is disposed with a plurality of Scan lines (Scan lines) extending along the first direction and a plurality of Data lines (Data lines) extending along the second direction in a grid shape. Wherein the first direction and the second direction are perpendicular to each other, and the scan lines, the data lines, and the scan lines are insulated from each other. That is, the plurality of scan lines are sequentially arranged at intervals along the second direction and are mutually insulated, the plurality of data lines are sequentially arranged at intervals along the first direction and are mutually insulated, and the plurality of scan lines and the plurality of data lines are mutually insulated.

In the embodiment of the present application, the display panel 200 includes a plurality of light emitting units 30 (see fig. 3) and a plurality of pixel circuits for driving the light emitting units 30 to emit light, and for convenience of explanation, the light emitting units 30 and the pixel circuits are integrated into a pixel unit 100 (see fig. 3), that is, the display panel 200 includes a plurality of pixel units 100.

One scanning line is intersected with a plurality of data lines, one data line is intersected with a plurality of scanning lines, namely a plurality of scanning lines and a plurality of data lines are mutually arranged in a grid shape, and the intersection parts of a plurality of scanning lines and a plurality of data lines are respectively provided with a light emitting unit 30 or a pixel unit 100 correspondingly. Specifically, the light emitting units 30 or the pixel units 100 are disposed between any two adjacent scan lines and any two adjacent data lines, the light emitting units 30 or the pixel units 100 located in the same column are electrically connected to the same data line, and the light emitting units 30 or the pixel units 100 located in the same row are electrically connected to the same scan line. In the embodiment of the present application, the plurality of light emitting units 30 or the plurality of pixel units 100 are distributed in an array. The scan lines are used for receiving scan signals from the scan driving circuit, and the data lines are used for receiving data signals from the data driving circuit.

When the light emitting units 30 are disposed at intersections of the scan lines and the data lines, the pixel circuits are disposed in the non-display area 210. Specifically, the pixel circuits are integrally disposed on a corresponding driving chip, and the driving chip is disposed on the non-display area 210 of the display panel 200. When the pixel units 100 are disposed at the intersections of the scan lines and the data lines, the driving circuit of the non-display area 210 of the display panel 200 directly controls the pixel units 100, so as to realize the display of the picture.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a pixel unit 100 according to an embodiment of the application. As shown in fig. 3, in the embodiment of the present application, the pixel unit 100 may at least include a charging unit 10, a conducting unit 20 electrically connected to the charging unit 10, a light emitting unit 30, and a control unit 50. The light emitting unit 30 and the control unit 50 are electrically connected to the conducting unit 20, the charging unit 10 receives a Scan signal Scan, and receives a data signal Vdata under the control of the Scan signal Scan to store electric energy, and the charging unit 10 is further configured to output an opening signal to the conducting unit 20 according to the stored electric energy.

The control unit 50 receives the data signal Vdata, the power signal Vdd, the turn-on signal VGH, and the reference signal Vref. When the data signal Vdata and the power signal Vdd are both at the first potential and the turn-on signal is greater than the reference signal Vref, the control unit 50 outputs a turn-on signal at the first potential to the turn-on unit 20.

The turn-on unit 20 receives the light-emitting signal Emit and the power signal Vdd, and the turn-on unit 20 transmits the received power signal Vdd to the light-emitting unit 30 according to the received turn-on signal, the turn-on signal, and the light-emitting signal Emit. The light emitting unit 30 receives the power signal Vdd and emits light under the driving of the power signal Vdd.

In a specific embodiment of the present application, the opening signal VGH may be the Scan signal Scan when at the first potential, which is not particularly limited in the present application.

In other embodiments of the present application, the pixel unit 100 may further include a discharge unit 60, and the discharge unit 60 is electrically connected to the control unit 50 and the light emitting unit 30. The control unit 50 selectively outputs a turn-on signal at a second potential to the discharge unit 60 according to the received data signal Vdata, and the discharge unit 60 discharges the electric charges of the light emitting unit 30 according to the turn-on signal at the second potential.

In the embodiment of the present application, it is understood that the circuit structure of the pixel unit 100 other than the light emitting unit 30 is a pixel circuit, that is, the pixel circuit includes the charging unit 10, the conducting unit 20, the control unit 50, and the like. The pixel circuits may be disposed at intersections of the plurality of scan lines and the data lines together with the light emitting unit 30, or may be disposed on a driving chip of the non-display region 210, which is not particularly limited in the present application.

Referring to fig. 4 together, fig. 4 is a schematic circuit diagram of the pixel unit 100 shown in fig. 3. In an embodiment of the present application, the light emitting unit 30 may be one or more light emitting elements. Specifically, the Light Emitting unit 30 may include at least one Organic Light Emitting Diode (OLED), which is not particularly limited in the present application.

As shown in fig. 4, in an embodiment of the present application, the light emitting unit 30 may be an organic light emitting diode, and the light emitting unit 30 includes a first end and a second end. The first end of the light emitting unit 30 is electrically connected to the conducting unit 20 to receive the power signal Vdd from the conducting unit 20. The second end of the light emitting unit 30 is electrically connected to the ground GND.

In some embodiments, the first end may be an anode of the organic light emitting diode and the second end may be a cathode of the organic light emitting diode, which is not particularly limited by the present application.

As shown in fig. 4, in the embodiment of the present application, the charging unit 10 includes a switching circuit 11 and a storage circuit 14. The switch circuit 11 is electrically connected to the memory circuit 14, and receives the Scan signal Scan and the data signal Vdata. The switch circuit 11 is selectively turned on or off with the memory circuit 14 according to the Scan signal Scan to selectively charge the memory circuit 14.

Specifically, when the Scan signal Scan is at the second potential, the switch circuit 11 is in an on state, that is, the switch circuit 11 is on with the memory circuit 14. The data signal Vdata is transmitted to the memory circuit 14 to charge the memory circuit 14. When the Scan signal Scan is at the first potential, the switch circuit 11 is in an off state, that is, the switch circuit 11 is disconnected from the memory circuit 14, so that the memory circuit 14 cannot be charged.

In an embodiment of the present application, the switch circuit 11 may be a charging transistor, and the storage circuit 14 may be a storage capacitor. The charge transistor includes a control terminal, a first terminal, and a second terminal, and the storage capacitor includes a first terminal and a second terminal. The control terminal of the charging transistor receives the Scan signal Scan, the first terminal of the charging transistor receives the data signal Vdata, and the second terminal of the charging transistor is electrically connected to the first terminal of the storage capacitor and the turn-on unit 20. The second end of the storage capacitor is electrically connected to the conducting unit 20.

At this time, when the Scan signal Scan is at the second potential, the charging transistor is in a conductive state, that is, the charging transistor is conductive to the storage capacitor. The data signal Vdata is transmitted to the storage capacitor to charge the storage capacitor. When the Scan signal Scan is at the first potential, the charging transistor is in an off state, that is, the charging transistor is disconnected from the storage capacitor, so that the storage capacitor cannot be charged.

In a specific embodiment of the present application, the first potential may be a high potential and the second potential may be a low potential, which is not particularly limited in the present application.

In a specific embodiment of the present application, the charging transistor may be a thin film field effect transistor (Thin Film Transistor, TFT), which is not particularly limited by the present application.

As shown in fig. 4, in the embodiment of the present application, the conducting unit 20 includes a first conducting circuit 22, a second conducting circuit 24, and a third conducting circuit 26. The first conducting circuit 22 is electrically connected to the switch circuit 11, the memory circuit 14, the second conducting circuit 24 and the third conducting circuit 26. The first conducting circuit 22 is configured to receive an on signal transmitted by the charging unit 10, and conduct or disconnect the second conducting circuit 24 and the third conducting circuit 26 according to the on signal.

That is, when the on signal is at the first potential, the first conductive circuit 22 is in a conductive state, and the second conductive circuit 24 and the third conductive circuit 26 are conductive; when the on signal is at the second potential, the first conductive circuit 22 is in an off state, and the second conductive circuit 24 and the third conductive circuit 26 are disconnected.

The second conducting circuit 24 is electrically connected to the first conducting circuit 22 and the control unit 50. The second conducting circuit 24 receives the power signal Vdd, the light emitting signal Emit, and the conducting signal transmitted by the control unit 50, and is selectively in a conducting state or a disconnecting state according to the light emitting signal Emit and the conducting signal. That is, when both the on signal and the light emitting signal Emit are at the first potential, the second on circuit 24 is in the on state. The second on-circuit 24 is in an off state when at least one of the on-signal and the light-emitting signal Emit is at a second potential.

The third conducting circuit 26 is electrically connected to the memory circuit 14, the first conducting circuit 22, the control unit 50 and the light emitting unit 30. The third conducting circuit 26 receives the light emitting signal Emit and the conducting signal transmitted by the control unit 50, and is selectively in a conducting or disconnecting state according to the light emitting signal and the conducting signal. That is, when both the on signal and the light emitting signal Emit are at the first potential, the third on circuit 26 is in the on state. When at least one of the on signal and the light emitting signal Emit is at the second potential, the third on circuit 26 is in an off state.

It will be appreciated that the discharge will begin when the memory circuit 14 is fully charged, and that the discharge of the memory circuit 14 will then transmit an on signal to the first pass circuit 22.

In an embodiment of the present application, the first conducting circuit 22 may include a first on switch, where the first on switch includes a control terminal, a first terminal and a second terminal, and the control terminal of the first on switch is electrically connected to the second terminal of the charging transistor (i.e. the switch circuit 11) and is configured to receive the on signal from the switch circuit 11. The first end of the first communication switch is electrically connected to the second conductive circuit 24, and the second end of the first communication switch is electrically connected to the third conductive circuit 26.

In an embodiment of the present application, the second conducting circuit 24 may include a second communicating switch 24a and a first communicating circuit 24b, where the second communicating switch 24a includes a control terminal, a first terminal and a second terminal, and the first communicating circuit 24b includes a first input terminal, a second input terminal and an output terminal.

The first input end of the first communication circuit 24b is configured to receive the light emitting signal Emit, and the second input end of the first communication circuit 24b is electrically connected to the third conductive circuit 26 and the control unit 50, and is configured to receive a conductive signal transmitted by the control unit 50. The output end of the first communication circuit 24b is electrically connected to the second communication switch 24a, and is configured to output a corresponding communication signal to the second communication switch 24a according to the on signal and the light emitting signal Emit, so as to control the second communication switch 24a to be in an on state or an off state. That is, when the on signal and the light emitting signal Emit are both at the first potential, the output terminal of the first communication circuit 24b outputs the communication signal at the first potential to the second communication switch 24a, and the communication signal at the first potential controls the second communication switch 24a to be in the on state. When at least one of the on signal and the light emitting signal Emit is at a second potential, the output terminal of the first communication circuit 24b outputs a communication signal at the second potential to the second communication switch 24a, and the communication signal at the second potential controls the second communication switch 24a to be in an off state.

The control end of the second communication switch 24a is electrically connected to the output end of the first communication circuit 24b, for receiving the communication signal transmitted by the first communication circuit 24b, the first end of the second communication switch 24a is for receiving the power signal Vdd, and the second end of the second communication switch 24a is electrically connected to the first end of the first communication switch (i.e. the first conductive circuit 22). When the control end of the second communication switch 24a receives the communication signal at the first potential, the second communication switch 24a is in a conductive state, that is, the first end and the second end of the second communication switch 24a are conductive. When the control end of the second communication switch 24a receives the communication signal at the second potential, the second communication switch 24a is in an off state, i.e., the first end and the second end of the second communication switch 24a are turned off.

In an embodiment of the present application, the third conducting circuit 26 may include a third communication switch 26a and a second communication circuit 26b, where the third communication switch 26a includes a control terminal, a first terminal and a second terminal, and the second communication circuit 26b includes a first input terminal, a second input terminal and an output terminal. The first input terminal of the second communication circuit 26b is configured to receive the light emitting signal Emit. The second input end of the second communication circuit 26b is electrically connected to the second input end of the first communication circuit 24b and the control unit 50, and is configured to receive the on signal transmitted by the control unit 50. The output end of the second communication circuit 26b is electrically connected to the third communication switch 26a, and is configured to output a corresponding communication signal to the third communication switch 26a according to the on signal and the light emitting signal Emit, so as to control the third communication switch 26a to be in an on state or an off state. That is, when the on signal and the light emitting signal Emit are both at the first potential, the output terminal of the second communication circuit 26b outputs the communication signal at the first potential to the third communication switch 26a, and the communication signal at the first potential controls the third communication switch 26a to be in the on state. When at least one of the on signal and the light emitting signal Emit is at a second potential, the output terminal of the second communication circuit 26b outputs a communication signal at the second potential to the third communication switch 26a, and the communication signal at the second potential controls the third communication switch 26a to be in an off state.

In this embodiment of the present application, the control end of the third communication switch 26a is electrically connected to the output end of the second communication circuit 26b, for receiving the communication signal transmitted by the second communication circuit 26b, and the first end of the third communication switch 26a is electrically connected to the second end of the first communication switch (i.e. the first conductive circuit 22) and the second end of the storage capacitor. The second end of the second communication switch 24a is electrically connected to the first end of the light emitting unit 30. When the control end of the third communication switch 26a receives the communication signal at the first potential, the third communication switch 26a is in a conductive state, that is, the first end and the second end of the third communication switch 26a are conductive. When the control end of the third communication switch 26a receives the communication signal at the second potential, the third communication switch 26a is in an off state, that is, the first end and the second end of the third communication switch 26a are off.

In the embodiment of the present application, when the first conductive circuit 22, the second conductive circuit 24 and the third conductive circuit 26 are in the conductive state, the power signal Vdd is transmitted to the light emitting unit 30 through the second conductive circuit 24, the first conductive circuit 22 and the third conductive circuit 26, and the light emitting unit 30 receives the power signal Vdd to emit light. Specifically, when the first, second and third communication switches 24a and 26a are in the on state, the power signal Vdd is transmitted to the light emitting element through the second, first and third communication switches 24a and 26a, and the light emitting unit 30 receives the power signal Vdd to emit light.

In the embodiment of the present application, the first communication switch, the second communication switch 24a and the third communication switch 26a may be thin film field effect transistors (Thin Film Transistor, TFT), and the first communication circuit 24b and the second communication circuit 26b may be and gates, which are not limited in this application.

As shown in fig. 4, in the embodiment of the present application, the control unit 50 includes a first selection circuit 51, a second selection circuit 52, and a comparison circuit 53. The first selection circuit 51 and the second selection circuit 52 each include a control terminal, a first terminal, and a second terminal, and the comparison circuit 53 includes a non-inverting input terminal, an inverting input terminal, and an output terminal. The control end of the first selection circuit 51 receives the data signal Vdata, the first end of the first selection circuit 51 receives the power signal Vdd, and the second end of the first selection circuit 51 is electrically connected to the control end of the second selection circuit 52. The first end of the second selection circuit 52 receives the open signal VGH, and the second end of the second selection circuit 52 is electrically connected to the non-inverting input end of the comparison circuit 53. An inverting input terminal of the comparison circuit 53 receives the reference signal Vref, and an output terminal of the comparison circuit 53 is electrically connected to the second input terminal of the first communication circuit 24b and the second input terminal of the second communication circuit 26 b. Wherein the data signal Vdata is used for controlling the first selection circuit 51 to be in an on state or an off state so as to selectively transmit the power signal Vdd to the second selection circuit 52. The power signal Vdd is used to control the second selection circuit 52 to be in an on state or an off state, so as to selectively transmit the open signal VGH to the non-inverting input terminal of the comparison circuit 53.

Specifically, when the data signal Vdata is at the first potential, the first selection circuit 51 is in the on state, and the power signal Vdd is transmitted to the second selection circuit 52. At this time, when the power supply signal Vdd is at the first potential, the power supply signal Vdd controls the second selection circuit 52 to be in the on state, and the open signal VGH is transmitted to the non-inverting input terminal of the comparison circuit 53. That is, the turn-on signal VGH can be transmitted to the non-inverting input terminal of the comparison circuit 53 only when both the data signal Vdata and the power supply signal Vdd are at the first potential.

In the embodiment of the present application, the comparison circuit 53 outputs a corresponding on signal to the on unit 20 from the output terminal of the comparison circuit 53 according to the comparison result of the received open signal VGH and the reference signal Vref. Specifically, when the open signal VGH is greater than the reference signal Vref, the output terminal of the comparison circuit 53 outputs a turn-on signal at a first potential to the turn-on unit 20. Specifically, the output terminal of the comparison circuit 53 outputs the on signal at the first potential to the second input terminal of the first communication circuit 24b and the second input terminal of the second communication circuit 26 b.

When the turn-on signal VGH is less than or equal to the reference signal Vref, the output terminal of the comparison circuit 53 outputs a turn-on signal at a second potential to the turn-on unit 20. Specifically, the output terminal of the comparison circuit 53 outputs the on signal at the second potential to the second input terminal of the first communication circuit 24b and the second input terminal of the second communication circuit 26 b.

In the embodiment of the present application, the first selection circuit 51 and the second selection circuit 52 may be transistors, and specifically may be N-type Metal-Oxide-semiconductor (N-Metal-Oxide-Semiconductor NMOS), which is not particularly limited in the present application. The comparison circuit 53 may be a comparator, and the present application is not particularly limited thereto.

In the embodiment of the present application, the control unit 50 is configured to determine the potential conditions of the data signal Vdata, the power signal Vdd and the turn-on signal VGH, and only when the data signal Vdata, the power signal Vdd and the turn-on signal VGH all reach the working values, that is, when the data signal Vdata, the power signal Vdd and the turn-on signal VGH are at the first potential, the control unit 50 outputs the turn-on signal at the first potential to the turn-on unit 20, so that the power signal Vdd can be transmitted to the light emitting unit 30 via the turn-on unit 20 to control the light emitting unit 30 to emit light, thereby avoiding abnormal phenomena such as flickering of the display screen of the display panel due to abnormal time sequence when the data signal Vdata, the power signal Vdd and the turn-on signal VGH reach the working values, and improving the display effect of the display panel 200 and user experience. For example, when the display panel 200 is turned off and displaying, the data signal Vdata is controlled to be at the second potential, and even if the timing of other signals is abnormal, the control unit 50 outputs the conducting signal at the second potential to the conducting unit 20, so that the transmission of the power signal Vdd to the light emitting unit 30 is stopped, and the light emitting element is turned off at the fastest speed, so that the display effect is prevented from being affected by the mislighting of the light emitting unit 30.

In other embodiments of the present application, the discharge cell 60 includes a first discharge path 62 and a second discharge path 64. The first electrical path 62 is electrically connected to the light emitting unit 30, the output end of the comparing circuit 53 of the control unit 50, and the ground GND, the second electrical path 64 is electrically connected to the light emitting unit 30, the output end of the comparing circuit 53 of the control unit 50, and the ground GND, and the first electrical path 62 and the second electrical path 64 are used for discharging charges at two ends of the light emitting unit 30.

The first discharging path 62 receives a turn-on signal from the output terminal of the comparing circuit 53, and selectively turns on the light emitting unit 30 and the ground terminal GND according to the turn-on signal. The second discharging path 64 receives a turn-on signal from the output terminal of the comparing circuit 53, and selectively turns on the light emitting unit 30 and the ground terminal GND according to the turn-on signal.

In the embodiment of the present application, the first discharge path 62 includes a first discharge switch 62a and a first discharge resistor 62b. The first discharge switch 62a includes a control terminal, a first terminal, and a second terminal. The control end of the first discharging switch 62a is electrically connected to the output end of the comparing circuit 53, and is configured to receive the conducting signal from the output end of the comparing circuit 53. The first end of the first discharge switch 62a is electrically connected to the first end of the light emitting unit 30, and the second end of the first discharge switch 62a is electrically connected to the first end of the first discharge resistor 62b. The second end of the first discharging resistor 62b is electrically connected to the ground GND.

The second discharge path 64 includes a second discharge switch 64a and a second discharge resistor 64b. The second discharge switch 64a includes a control terminal, a first terminal, and a second terminal. The control end of the second discharging switch 64a is electrically connected to the output end of the comparing circuit 53, and is configured to receive the conducting signal from the output end of the comparing circuit 53. The first end of the second discharge switch 64a is electrically connected to the second end of the light emitting unit 30, and the second end of the second discharge switch 64a is electrically connected to the first end of the second discharge resistor 64b. The second end of the second discharging resistor 64b is electrically connected to the ground GND.

Specifically, when the control terminal of the first discharge switch 62a and the control terminal of the second discharge switch 64a receive a conduction signal at a second potential, the conduction signal at the second potential controls the first discharge switch 62a and the second discharge switch 64a to be in a conduction state, that is, to be respectively conducted between the first terminal and the second terminal of the first discharge switch 62a and the second terminal of the second discharge switch 64 a. The charges at both ends of the light emitting element 30 are transferred to the ground GND via the first and second discharge paths 62 and 64 to be discharged. When the control end of the first discharge switch 62a and the control end of the second discharge switch 64a receive a conducting signal at a first potential, the conducting signal at the first potential controls the first discharge switch 62a and the second discharge switch 64a to be in an off state.

In an embodiment of the present application, the first discharging switch 62a and the second discharging switch 64a may be PMOS transistors, where the first potential is a high potential and the second potential is a low potential, and the present application is not limited thereto.

It should be understood that, in other embodiments of the present application, if the first selection circuit 51 and the second selection circuit 52 are PMOS transistors, the first discharge switch 62a and the second discharge switch 64a may be NMOS transistors, which is not particularly limited in the present application.

In the embodiment of the present application, the discharging unit 60 is configured to transfer the charges remaining in the light emitting unit 30 to the ground GND for release, so as to avoid the problem that the light emitting unit 30 emits light by mistake due to the remaining charges when the display panel is turned on or off, and further cause the display panel 100 to have screen flicker, abnormal picture, etc., and improve the display effect of the display panel 100.

Based on the same concept, the embodiment of the application also discloses a display panel 200, where the display panel 200 includes the pixel unit 100 and a driving circuit, and the driving circuit is used to drive the pixel unit 100 to emit light.

Based on the same concept, the embodiment of the application also discloses a display device 1000, where the display device 1000 includes the display panel 200 and the power module 300, and the power module 300 is used for providing a power supply voltage for displaying images of the display panel 200.

In summary, in the pixel unit 100, the display panel 200 and the display device 1000 of the present application, the control unit 50 is configured to determine the potential conditions of the data signal Vdata, the power signal Vdd and the open signal VGH, and only when the data signal Vdata, the power signal Vdd and the open signal VGH all reach the working values (i.e. all the three are at the first potential), the control unit 50 outputs the conducting signal at the first potential to the conducting unit 20, so that the power signal Vdd can be transmitted to the light emitting unit 30 via the conducting unit 20 to control the light emitting unit 30 to emit light, thereby avoiding the problem that the display panel has abnormal phenomena such as flickering due to the time sequence abnormality of the data signal Vdata, the power signal Vdd and the open signal VGH reaching the working values when the display panel is turned on or off, improving the display effect of the display panel 200 and enhancing the user experience. For example, when the display panel 200 is turned off to display, the data signal Vdata is controlled to be at the second potential, and even if the timing of other signals is abnormal, the control unit 50 outputs the conducting signal at the second potential to the conducting unit 20, so that the power signal Vdd is stopped from being transmitted to the light emitting unit 30, and the light emitting element is turned off at the fastest speed, so that the display effect is prevented from being affected by the mislighting of the light emitting unit 30.

In addition, by setting the discharging unit 60, the residual charges of the light emitting unit 30 can be transferred to the ground GND for release, so that the problem that the light emitting unit 30 emits light by mistake due to the residual charges of the display panel when the display panel is turned on or off is avoided, and further, the display panel 100 has the problems of screen flicker, abnormal picture and the like, and the display effect of the display panel 100 is improved.

All possible combinations of the technical features in the above embodiments are described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It is to be understood that the above examples represent only a few embodiments of the present application, which are described in more detail and detail, but are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. The pixel unit comprises a light emitting unit, and is characterized by further comprising a charging unit, a conducting unit and a control unit, wherein the charging unit, the light emitting unit and the control unit are electrically connected with the conducting unit,

the charging unit is used for receiving a scanning signal, receiving a data signal under the control of the scanning signal so as to store electric energy, and outputting an opening signal to the conducting unit according to the stored electric energy;

the control unit is used for receiving the data signal, the power signal, the opening signal and the reference signal, and outputting a conduction signal at a first potential to the conduction unit when the data signal and the power signal are at the first potential and the opening signal is larger than the reference signal; the control unit comprises a first selection circuit, a second selection circuit and a comparison circuit, wherein the control end of the first selection circuit receives the data signal, the first end of the first selection circuit receives the power signal, the second end of the first selection circuit is electrically connected with the control end of the second selection circuit, and the first selection circuit is used for being in a connection state or a disconnection state under the control of the data signal so as to selectively transmit the power signal to the second selection circuit; the first end of the second selection circuit is used for receiving the opening signal, the second end of the second selection circuit is electrically connected to the positive input end of the comparison circuit, the negative input end of the comparison circuit is used for receiving the reference signal, the output end of the comparison circuit is electrically connected to the conducting unit, the second selection circuit is used for being in a conducting state or a disconnecting state under the control of the power supply signal so as to selectively transmit the opening signal to the positive input end of the comparison circuit, and the comparison circuit outputs the corresponding conducting signal to the conducting unit from the output end of the comparison circuit according to the comparison result of the opening signal and the reference signal;

The conduction unit is used for receiving a light-emitting signal and the power supply signal and selectively transmitting the power supply signal to the light-emitting unit according to the conduction signal, the starting signal and the light-emitting signal; the light-emitting unit receives the power supply signal and emits light under the drive of the power supply signal.

2. The pixel cell of claim 1, wherein the turn-on unit includes a first turn-on circuit, a second turn-on circuit, and a third turn-on circuit, wherein,

the first conduction circuit is electrically connected to the charging unit, the second conduction circuit and the third conduction circuit, and is used for receiving the opening signal transmitted by the charging unit and is in a conduction state or a disconnection state according to the opening signal so as to selectively conduct or disconnect the second conduction circuit and the third conduction circuit;

the second conduction circuit is electrically connected to the control unit, and is used for receiving the power supply signal, the light-emitting signal and the conduction signal transmitted by the control unit, and is selectively in a conduction state or a disconnection state according to the light-emitting signal and the conduction signal;

The third conduction circuit is electrically connected to the charging unit, the second conduction circuit, the control unit and the light-emitting unit, and is used for receiving the light-emitting signal and the conduction signal transmitted by the control unit, and is selectively in a conduction state or a disconnection state according to the light-emitting signal and the conduction signal.

3. The pixel cell of claim 2, wherein the first turn-on circuit comprises a first turn-on switch, a control terminal of the first turn-on switch being electrically connected to the charging unit for receiving the turn-on signal from the charging unit; the first end of the first communication switch is electrically connected to the second conduction circuit, and the second end of the first communication switch is electrically connected to the third conduction circuit;

the second communication circuit comprises a second communication switch and a first communication circuit, the control end of the second communication switch is electrically connected with the output end of the first communication circuit, the first end of the second communication switch is used for receiving the power signal, the second end of the second communication switch is electrically connected to the first end of the first communication switch, the first input end of the first communication circuit is used for receiving the luminous signal, the second input end of the first communication circuit is electrically connected to the third communication circuit and the output end of the comparison circuit, the second input end of the first communication circuit is used for receiving the communication signal transmitted by the output end of the comparison circuit, and the first communication circuit outputs a corresponding communication signal to the control end of the second communication switch from the output end of the first communication circuit according to the received communication signal and the luminous signal so as to control the second communication switch to be in a conducting state or a disconnecting state;

The third communication circuit comprises a third communication switch and a second communication circuit, the control end of the third communication switch is electrically connected with the output end of the second communication circuit, the first end of the third communication switch is electrically connected with the charging unit and the second end of the first communication switch, the second end of the third communication switch is electrically connected to the light emitting unit, the first input end of the second communication circuit is used for receiving the light emitting signal, the second input end of the second communication circuit is electrically connected to the second input end of the first communication circuit and the output end of the comparison circuit, the second input end of the second communication circuit is used for receiving the conduction signal transmitted by the output end of the comparison circuit, and the second communication circuit outputs the corresponding communication signal to the control end of the third communication switch according to the received conduction signal and the light emitting signal so as to control the third communication switch to be in a conduction state or a disconnection state.

4. The pixel cell of claim 3, wherein the power signal is transmitted to the light emitting unit via the second, first and third communication switches when the first, second and third communication switches are all in an on state, the light emitting unit receiving the power signal to emit light.

5. The pixel cell of any one of claims 1-4, further comprising a discharge unit electrically connected to the control unit and the light emitting unit, the control unit selectively outputting the on signal at a second potential to the discharge unit according to the received data signal, the discharge unit discharging the charge of the light emitting unit according to the on signal at the second potential.

6. The pixel cell of claim 5, wherein the discharge cell comprises a first discharge path and a second discharge path, wherein the first discharge path is electrically connected to the light emitting cell, the output of the comparator circuit, and the ground, and the second discharge path is electrically connected to the light emitting cell, the output of the comparator circuit, and the ground;

the first discharging path receives the conducting signal from the output end of the comparison circuit and selectively conducts the light-emitting unit and the grounding end according to the conducting signal;

the second discharging path receives the conducting signal from the output end of the comparison circuit, and selectively conducts the light emitting unit and the grounding end according to the conducting signal.

7. The pixel cell of claim 6, wherein the first discharge path comprises a first discharge switch and a first discharge resistor, wherein a control terminal of the first discharge switch is electrically connected to an output terminal of the comparison circuit for receiving the turn-on signal from the output terminal of the comparison circuit, a first terminal of the first discharge switch is electrically connected to a first terminal of the light emitting unit, a second terminal of the first discharge switch is electrically connected to a first terminal of the first discharge resistor, and a second terminal of the first discharge resistor is electrically connected to the ground terminal;

the second discharging path comprises a second discharging switch and a second discharging resistor, wherein a control end of the second discharging switch is electrically connected to an output end of the comparison circuit and is used for receiving the conducting signal from the output end of the comparison circuit, a first end of the second discharging switch is electrically connected to a second end of the light emitting unit, a second end of the second discharging switch is electrically connected to a first end of the second discharging resistor, and a second end of the second discharging resistor is electrically connected to the grounding end.

8. A display panel comprising a driving circuit for driving a plurality of the pixel units to emit light, and a plurality of the pixel units as claimed in any one of claims 1 to 7.

9. A display device comprising a power supply module and the display panel of claim 8, wherein the power supply module is configured to provide a power supply voltage for displaying images on the display panel.