CN115953985A

CN115953985A - Pixel unit, display panel and display device

Info

Publication number: CN115953985A
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: 2023-04-11
Anticipated expiration: 2042-12-28
Also published as: CN115953985B

Abstract

The application relates to a pixel unit, a display panel and a display device. The charging unit of the pixel unit receives and receives the data signal under the control of the scanning signal to store electric energy, and outputs a starting signal to the conduction unit according to the stored electric energy. When the control unit of the pixel unit receives the data signal and the power signal at the first potential and receives the opening signal greater than the reference signal, the control unit outputs the conducting signal at the first potential to the conducting unit. The conducting unit is used for receiving and selectively transmitting the power supply signal to the light-emitting unit according to the conducting signal, the starting signal and the light-emitting signal. The light-emitting unit receives and emits light under the drive of a power supply signal. In the pixel unit of this application, only when data signal, power signal and turn-on signal all reached the working value, power signal just can transmit to the luminescence unit and give out light in order to control the luminescence unit, has avoided the signal time sequence unusual problem that leads to the display frame to appear abnormal phenomena such as scintillation.

Description

Pixel unit, display panel and display device

Technical Field

The present disclosure relates to the field of display technologies, and particularly to a pixel unit, a display panel having the pixel unit, and a display device having the display panel.

Background

Organic Light-Emitting Diode (OLED) display panels can meet new requirements of consumers on display technologies by virtue of their advantages of being thinner, low in power consumption, good in flexibility, and the like, and thus are widely applied to various display devices.

However, when the OLED display panel is turned on or off, the turn-on/off timing is easily abnormal due to factors such as a data voltage timing error, a driving voltage timing error, and incomplete static electricity discharge, which may cause phenomena such as flickering and abnormal pictures when the OLED display panel is turned on or off.

Therefore, it is an urgent need to solve the problem of the OLED display panel that the abnormal on/off timing is caused by the voltage timing error and the static electricity not discharged completely when the OLED display panel is turned on/off.

Disclosure of Invention

In view of the shortcomings of the prior art, the present application provides a pixel unit, a display panel and a display device. Only when the data signal, the power signal and the opening signal reach working values, the power signal can be transmitted to the light-emitting unit to control the light-emitting unit to emit light, and the problem of abnormal phenomena such as flicker of a display picture caused by abnormal signal time sequence is avoided.

In a first aspect, the present application provides a pixel unit, which 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 scanning signal and receive a data signal under the control of the scanning signal to store electric energy, and output a start 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 when the data signal and the power signal are at a first potential and the opening signal is greater than the reference signal, the control unit outputs a conducting signal at the first potential to the conducting unit; 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 driving of the power supply signal.

In some embodiments, the control unit includes a first selection circuit, a second selection circuit, and a comparison circuit, wherein a control terminal of the first selection circuit receives the data signal, a first terminal of the first selection circuit receives the power signal, a second terminal of the first selection circuit is electrically connected to a control terminal 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 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 positive input end of the comparison circuit, the negative 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 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.

In some embodiments, the conducting unit includes a first conducting circuit, a second conducting circuit and a third conducting circuit, wherein 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 start signal transmitted by the charging unit and is in a conducting or disconnecting state according to the start signal, so as to selectively conduct or disconnect between the second conducting circuit and the third conducting circuit; the second conducting circuit is electrically connected to the control unit, and is used for receiving the power signal, the light-emitting signal and the conducting signal transmitted by the control unit and selectively being in a conducting state or a disconnecting state according to the light-emitting signal and the conducting signal; the third conducting circuit is electrically connected to the charging unit, the second conducting circuit, the control unit and the light emitting unit, and is used for receiving the light emitting signal and the conducting signal transmitted by the control unit and selectively being in a conducting or disconnecting state according to the light emitting signal and the conducting signal.

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

In some embodiments, when the first communication switch, the second communication switch and the third communication switch are all in a conducting state, the power signal is transmitted to the light-emitting element through the second communication switch, the first communication switch and the third communication switch, and the light-emitting element receives the power signal to emit light.

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

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

In some embodiments, the first discharge path includes a first discharge switch and a first discharge resistor, wherein a control terminal of the first discharge switch is electrically connected to the 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 the first terminal of the light emitting unit, a second terminal of the first discharge switch is electrically connected to the 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 discharge path includes a second discharge switch and a second discharge resistor, wherein a control terminal of the second discharge switch is electrically connected to the output terminal of the comparison circuit, and is configured to receive the on-signal from the output terminal of the comparison circuit, a first terminal of the second discharge switch is electrically connected to the second terminal of the light emitting unit, a second terminal of the second discharge switch is electrically connected to the first terminal of the second discharge resistor, and a second terminal of the second discharge resistor is electrically connected to the ground terminal.

In a second aspect, the present application provides a display panel, which includes a driving circuit and a plurality of the above pixel units, wherein 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, which includes a power module and the display panel, where the power module is configured to provide a power voltage for the display panel to display an image.

To sum up, in the pixel element, display panel and display device of this application, through setting up the control unit, judge data signal, signal power and the electric potential condition of opening the signal, only work as data signal power and when opening the signal and all reaching the working value, the control unit just can export the conducting signal that is in first electric potential to the unit that switches on, and then makes signal power can transmit to luminescence unit in order to control through the unit that switches on the light-emitting unit is luminous, has avoided display panel when the switching on and shutting down, because data signal, signal power and opening the time sequence that the signal reached the working value are unusual, and lead to display panel's display screen to appear the problem of unusual phenomena such as scintillation, has improved display panel's display effect, has promoted user experience. For example, when the display panel is turned off to display, the data signal is controlled to be at the second potential, even if the time sequence of other signals is abnormal, the control unit outputs the conducting signal at the second potential to the conducting unit, and then the power supply signal is stopped being transmitted to the light emitting unit, so that the light emitting element is turned off at the fastest speed, and the phenomenon that the display effect is influenced by mistaken light emission of the light emitting unit is avoided.

In addition, through setting up the discharge unit, can with the remaining electric charge of luminescence unit transmits to the earthing terminal releases to avoided display panel's remaining electric charge when the switching on and shutting down to cause the luminescence unit mistake is luminous, and then lead to display panel appears screen scintillation, picture scheduling problem unusually, has promoted display panel's display effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a display device disclosed in 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 disclosure;

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

Description of reference numerals:

1000-a display device; 200-a display panel; 300-a power module; 400-a support frame; 210-a non-display area; 220-a display area; 30-a light emitting unit; 100-pixel unit; 10-a charging unit; 20-conducting unit; 50-a control unit; 60-discharge cells; 11-a switching circuit; 14-a storage circuit; 22-a first conducting circuit; 24-a second conduction circuit; 26-a third conduction circuit; 24 a-a second communication switch; 24 b-a first connection circuit; 26 a-third communication switch; 26 b-a second pass circuit; 51-a first selection circuit; 52-a second selection circuit; 53-a comparison circuit; 62-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 supply signal; VGH-open signal; vref-reference signal; emit-the luminescent signal.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. 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 various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments that can be implemented by the application. The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified. Directional phrases used in this application, such as, for example, "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the appended drawings and are, therefore, used herein for better and clearer illustration and understanding of the application and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for 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 order. Furthermore, the terms "comprises," "comprising," "includes," "including," or "including," when used in this application, specify the presence of stated features, operations, elements, and/or the like, but do not limit one or more other features, operations, elements, and/or the like. Furthermore, the terms "comprises" or "comprising" indicate the presence of the respective features, numbers, steps, operations, elements, components or combinations thereof disclosed in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, elements, components or combinations thereof, and are intended to cover non-exclusive inclusions. It is also to be understood that the term "at least one" as used herein means one and more than one, such as one, two or three, etc., and the term "plurality" means at least two, such as two or three, etc., unless specifically limited otherwise. The terms "step 1", "step 2", and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular 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 present 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 present disclosure. As shown in fig. 1, in the embodiment of the present application, a 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 to the supporting frame 400, and the power module 300 is disposed on a back surface of the display panel 200, that is, the power module 300 is disposed on a non-display surface of the display panel 200. The power module 300 is used for providing power voltage for the display panel 200 to display images, and the supporting 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 invention, the specific type of the display device 1000 is not particularly limited, and those skilled in the art can design the display device 1000 accordingly according to the specific use requirement of the application, and the details are not repeated herein.

In an exemplary embodiment, the display device 1000 may further include other necessary components and compositions such as a driving board, a power board, a high voltage board, a key control board, etc., and those skilled in the art may supplement the display device 200 accordingly according to the specific type and actual functions thereof, which are not described herein again.

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

Referring to fig. 2, fig. 2 is a schematic structural diagram of the display panel 200 in the display device 1000 shown in fig. 1. As shown in fig. 2, in the 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 at least partially surrounds 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 understood that, in some embodiments, the display panel 200 may use a liquid crystal material as a display medium, and is not limited thereto.

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

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 illustration, 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 intersects with a plurality of data lines, and one data line intersects with a plurality of scanning lines, that is, the plurality of scanning lines and the plurality of data lines are arranged in a grid shape, and the intersection parts of the plurality of scanning lines and the plurality of data lines are correspondingly provided with light emitting units 30 or pixel units 100. Specifically, the light emitting units 30 or the pixel units 100 are disposed between any two adjacent scanning 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 scanning line. In the embodiment of the present application, a plurality of the light emitting units 30 or a plurality of the 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.

It should be noted that, when the light emitting units 30 are disposed at the intersections of the plurality of scan lines and the plurality of data lines, the pixel circuits are disposed in the non-display region 210. Specifically, the pixel circuits are integrally disposed on corresponding driving chips disposed in the non-display region 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 in the non-display area 210 of the display panel 200 directly controls the pixel units 100, so that image display can be achieved.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a pixel unit 100 according to an embodiment of the disclosure. As shown in fig. 3, in the embodiment of the present application, the pixel unit 100 at least includes 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 a start 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 conducting unit 20 receives the light emitting signal Emit and the power signal Vdd, and the conducting unit 20 transmits the received power signal Vdd to the light emitting unit 30 according to the received conducting 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 turn-on signal VGH may be the Scan signal Scan at the first potential, which is not particularly limited in the present application.

In other embodiments of the present disclosure, 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 discharging unit 60 according to the received data signal Vdata, and the discharging unit 60 discharges the 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 except for the light emitting unit 30 is a pixel circuit, that is, the pixel circuit includes a charging unit 10, a conducting unit 20, a control unit 50, and the like. The pixel circuit may be disposed at an intersection of the plurality of scan lines and the plurality of 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, fig. 4 is a schematic circuit diagram of the pixel unit 100 shown in fig. 3. In the 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 the 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 terminal and a second terminal. 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 terminal may be an anode of the organic light emitting diode, and the second terminal may be a cathode of the organic light emitting diode, which is not particularly limited in this 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 storage circuit 14, and receives the Scan signal Scan and the data signal Vdata. The switch circuit 11 selectively switches on or off the storage circuit 14 according to the Scan signal Scan to selectively charge the storage circuit 14.

Specifically, when the Scan signal Scan is at the second potential, the switch circuit 11 is in a conductive state, that is, the switch circuit 11 and the memory circuit 14 are conductive. The data signal Vdata is transmitted to the storage circuit 14 to charge the storage 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 storage circuit 14, and the storage circuit 14 cannot be charged.

In this embodiment, the switch circuit 11 may be a charging transistor, and the storage circuit 14 may be a storage capacitor. The charging transistor comprises a control terminal, a first terminal and a second terminal, and the storage capacitor comprises a first terminal and a second terminal. The control end of the charging transistor receives the Scan signal Scan, the first end of the charging transistor receives the data signal Vdata, and the second end of the charging transistor is electrically connected to the first end of the storage capacitor and the conducting 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 conducting state, that is, the charging transistor is conducted with 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 a first potential, the charging transistor is in a disconnected state, that is, the charging transistor is disconnected from the storage capacitor, and 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 Transistor (TFT), which is not particularly limited in the present application.

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

That is, when the on signal is at the first potential, the first conducting circuit 22 is in a conducting state, and the second conducting circuit 24 and the third conducting circuit 26 are conducted; when the on signal is at the second potential, the first conducting circuit 22 is in an off state, and the second conducting circuit 24 and the third conducting 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 conduction circuit 24 receives the power signal Vdd, the emission signal Emit and the conduction signal transmitted by the control unit 50, and is selectively in a conduction state or a disconnection state according to the emission signal Emit and the conduction signal. That is, when both the on signal and the emission signal Emit are at the first potential, the second on circuit 24 is in the on state. When at least one of the on signal and the emission signal Emit is at the second potential, the second on circuit 24 is in an off state.

The third conducting circuit 26 is electrically connected to the storage 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 state or a disconnecting state according to the light emitting signal and the conducting signal. That is, when both the on signal and the emission signal Emit are at the first potential, the third on circuit 26 is in an on state. When at least one of the conduction signal and the emission signal Emit is at the second potential, the third conduction circuit 26 is in an off state.

It will be appreciated that the memory circuit 14 will begin to discharge when fully charged, and that the memory circuit 14 will transmit a turn-on signal to the first turn-on circuit 22 when discharged.

In an embodiment of the present invention, the first conduction circuit 22 may include a first conduction switch, the first conduction switch includes a control terminal, a first terminal and a second terminal, and the control terminal of the first conduction switch is electrically connected to the second terminal of the charging transistor (i.e., the switch circuit 11) for receiving the turn-on signal from the switch circuit 11. A first terminal of the first conduction switch is electrically connected to the second conduction circuit 24, and a second terminal of the first conduction switch is electrically connected to the third conduction circuit 26.

In this embodiment, the second turn-on circuit 24 may include a second turn-on switch 24a and a first turn-on circuit 24b, the second turn-on switch 24a includes a control terminal, a first terminal and a second terminal, and the first turn-on circuit 24b includes a first input terminal, a second input terminal and an output terminal.

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

The control end of the second connection switch 24a is electrically connected to the output end of the first connection circuit 24b, and is configured to receive the connection signal transmitted by the first connection circuit 24b, the first end of the second connection switch 24a is configured to receive the power signal Vdd, and the second end of the second connection switch 24a is electrically connected to the first end of the first connection switch (i.e., the first connection circuit 22). When the control end of the second connection switch 24a receives the connection signal at the first potential, the second connection switch 24a is in a conduction state, that is, the first end and the second end of the second connection switch 24a are conducted. When the control terminal of the second connection switch 24a receives the connection signal at the second potential, the second connection switch 24a is in an off state, that is, the first terminal and the second terminal of the second connection switch 24a are off.

In the embodiment of the present application, the third conducting circuit 26 may include a third conducting switch 26a and a second conducting circuit 26b, the third conducting switch 26a includes a control terminal, a first terminal and a second terminal, and the second conducting circuit 26b includes a first input terminal, a second input terminal and an output terminal. A first input terminal of the second communication circuit 26b is configured to receive the emission signal Emit. A 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 conduction 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 conduction signal and the emission signal Emit, so as to control the third communication switch 26a to be in a conduction state or a disconnection state. That is, when both the on signal and the emission signal Emit are at the first potential, the output terminal of the second communicating circuit 26b outputs the communicating signal at the first potential to the third communicating switch 26a, and the communicating signal at the first potential controls the third communicating switch 26a to be in the on state. When at least one of the conduction signal and the emission signal Emit is at the second potential, the output end of the second connection circuit 26b outputs a connection signal at the second potential to the third connection switch 26a, and the connection signal at the second potential controls the third connection switch 26a to be in an off state.

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

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

In this embodiment, the first communication switch, the second communication switch 24a, and the third communication switch 26a may be Thin Film Transistor (TFT), and the first communication circuit 24b and the second communication circuit 26b may be and circuits, which are not specifically 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 terminal of the first selection circuit 51 receives the data signal Vdata, the first terminal of the first selection circuit 51 receives the power signal Vdd, and the second terminal of the first selection circuit 51 is electrically connected to the control terminal of the second selection circuit 52. A first terminal of the second selection circuit 52 receives the open signal VGH, and a second terminal of the second selection circuit 52 is electrically connected to the non-inverting input terminal of the comparison circuit 53. An inverting input terminal of the comparing circuit 53 receives the reference signal Vref, and an output terminal of the comparing circuit 53 is electrically connected to the second input terminal of the first pass circuit 24b and the second input terminal of the second pass circuit 26 b. The data signal Vdata is used to control 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 a conducting state or a disconnecting 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 an on state, and the power supply 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 a conducting state, and the turn-on signal VGH is transmitted to the non-inverting input terminal of the comparison circuit 53. That is, the turn-on signal VGH may be transmitted to the non-inverting input terminal of the comparison circuit 53 only when the data signal Vdata and the power supply signal Vdd are both at the first potential.

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

When the turn-on signal VGH is less than or equal to the reference signal Vref, the output terminal of the comparing circuit 53 outputs a turn-on signal at a second potential to the turn-on unit 20. Specifically, the output end of the comparison circuit 53 outputs a conducting signal at a second potential to the second input end of the first connecting circuit 24b and the second input end of the second connecting 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-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, which is not particularly limited in this application.

In the embodiment of the present application, by setting the control unit 50, the potential conditions of the data signal Vdata, the power signal Vdd, and the open signal VGH are determined, and only when the data signal Vdata, the power signal Vdd, and the open signal VGH all reach the working value, that is, the data signal Vdata, the power signal Vdd, and the open signal VGH are all 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 abnormal phenomena such as flicker of the display screen of the display panel due to abnormal timing sequence when the data signal Vdata, the power signal Vdd, and the open signal VGH reach the working value when the display panel is turned on or turned off, improving the display effect of the display panel 200, and improving the user experience. For example, when the display panel 200 is turned off, the data signal Vdata is controlled to be at the second potential, and even if the timing sequence of other signals is abnormal, the control unit 50 outputs the on signal at the second potential to the on unit 20, and further stops transmitting the power signal Vdd to the light emitting unit 30, so that the light emitting element is turned off at the fastest speed, and the display effect is prevented from being influenced by the light emission of the light emitting unit 30 by mistake.

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 terminal of the comparison circuit 53 of the control unit 50, and a ground terminal GND, the second electrical discharge path 64 is electrically connected to the light emitting unit 30, the output terminal of the comparison circuit 53 of the control unit 50, and the ground terminal GND, and the first electrical discharge path 62 and the second electrical discharge path 64 are used for discharging charges at two ends of the light emitting unit 30.

The first discharge path 62 receives a turn-on signal from the output terminal of the comparison circuit 53, and selectively turns on the light emitting unit 30 and the ground terminal GND according to the turn-on signal. The second discharge path 64 receives a turn-on signal from the output terminal of the comparison 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 terminal of the first discharge switch 62a is electrically connected to the output terminal of the comparison circuit 53, and is configured to receive the turn-on signal from the output terminal of the comparison circuit 53. A first terminal of the first discharge switch 62a is electrically connected to the first terminal of the light emitting unit 30, and a second terminal of the first discharge switch 62a is electrically connected to the first terminal of the first discharge resistor 62b. The second end of the first discharge 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 terminal of the second discharge switch 64a is electrically connected to the output terminal of the comparison circuit 53, and is configured to receive the turn-on signal from the output terminal of the comparison circuit 53. A first terminal of the second discharge switch 64a is electrically connected to a second terminal of the light emitting unit 30, and a second terminal of the second discharge switch 64a is electrically connected to a first terminal of the second discharge resistor 64b. The second end of the second discharge resistor 64b is electrically connected to the ground GND.

Specifically, when the control terminal of the first discharging switch 62a and the control terminal of the second discharging switch 64a receive the conducting signal at the second potential, the conducting signal at the second potential controls the first discharging switch 62a and the second discharging switch 64a to be in the conducting state, that is, the first terminal and the second terminal of the first discharging switch 62a and the second terminal of the second discharging switch 64a are respectively conducted. The charges at both ends of the light emitting element 30 are transferred to the ground GND through the first and second discharging

paths

62 and 64 to be discharged. When the control terminal of the first discharge switch 62a and the control terminal of the second discharge switch 64a receive the on signal at the first potential, the on signal at the first potential controls both the first discharge switch 62a and the second discharge switch 64a to be in the off state.

In a specific embodiment of the present application, the first discharge switch 62a and the second discharge switch 64a may be PMOS transistors, and the first potential is a high potential and the second potential is a low potential, which is not limited in this application.

It is 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, and the present application is not limited in this respect.

In the embodiment of the present application, by setting the discharging unit 60, the residual charges of the light emitting unit 30 are transmitted to the ground terminal GND for releasing, so that the residual charges of the display panel when the display panel is turned on or off are prevented from causing the light emitting unit 30 to emit light by mistake, 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.

Based on the same concept, the embodiment of the present application further 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 for driving the pixel unit 100 to emit light.

Based on the same concept, the embodiment of the present application further 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 configured to provide a power voltage for the display panel 200 to perform image display.

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 arranged 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 value (that is, the data signal Vdata, the power signal Vdd and the turn-on signal VGH are all 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 through the conducting unit 20 to control the light-emitting unit 30 to emit light, thereby avoiding the problem that the display screen of the display panel has abnormal phenomena such as flickering due to the abnormal timing sequence that the data signal ata, the power signal Vdd and the turn-on signal VGH reach the working value when the display panel is turned on and turned 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, 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, and further stops transmitting the power signal Vdd to the light emitting unit 30, so that the light emitting element is turned off at the fastest speed, and the display effect is prevented from being influenced by the false light emission of the light emitting unit 30.

In addition, by arranging the discharge unit 60, the residual charges of the light emitting unit 30 can be transmitted to the ground terminal GND for releasing, so that the problems of screen flicker, abnormal pictures and the like of the display panel 100 caused by mistaken light emission of the light emitting unit 30 due to the residual charges of the display panel during the startup and shutdown are avoided, and the display effect of the display panel 100 is improved.

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

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like 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 application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. 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 should be understood that the above-described examples merely represent several embodiments of the present application, which are described in greater detail and detail, but are not to be construed as limiting the scope of the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A pixel unit comprises a light emitting unit, and is characterized in that the pixel unit further comprises a charging unit, a conduction unit and a control unit, wherein the charging unit, the light emitting unit and the control unit are electrically connected with the conduction unit,

the charging unit is used for receiving a scanning signal, receiving a data signal under the control of the scanning signal to store electric energy, and outputting a starting 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 when the data signal and the power signal are at a first potential and the opening signal is greater than the reference signal, the control unit outputs a conducting signal at the first potential to the conducting unit;

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 driving of the power supply signal.

2. The pixel unit according to claim 1, wherein the control unit comprises a first selection circuit, a second selection circuit and a comparison circuit, wherein a control terminal of the first selection circuit receives the data signal, a first terminal of the first selection circuit receives the power signal, a second terminal of the first selection circuit is electrically connected to a control terminal 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 to selectively transmit the power signal to the second selection circuit;

the first end of the second selection circuit receives the turn-on 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 receives the reference signal, the output end of the comparison circuit is electrically connected to the conduction unit, the second selection circuit is used for being in a conduction state or a disconnection state under the control of the power signal so as to selectively transmit the turn-on signal to the positive input end of the comparison circuit, and the comparison circuit outputs the corresponding conduction signal from the output end of the comparison circuit to the conduction unit according to the comparison result of the turn-on signal and the reference signal.

3. The pixel cell of claim 2, wherein the conduction cell comprises a first conduction circuit, a second conduction circuit, and a third conduction 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 starting signal transmitted by the charging unit and selectively conducting or disconnecting the second conduction circuit and the third conduction circuit according to the starting signal in a conducting or disconnecting state;

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

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

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

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

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

5. The pixel cell of claim 4, wherein when the first pass switch, the second pass switch, and the third pass switch are all in a conducting state, the power signal is transmitted through the second pass switch, the first pass switch, and the third pass switch to the light emitting element, and the light emitting element receives the power signal to emit light.

6. The pixel unit according to any one of claims 2-5, further comprising a discharging unit electrically connected to the control unit and the light emitting unit, wherein the control unit selectively outputs the conducting signal at a second potential to the discharging unit according to the received data signal, and the discharging unit discharges the charge of the light emitting unit according to the conducting signal at the second potential.

7. The pixel cell of claim 6, wherein the discharge cell comprises a first discharge path electrically connected to the light emitting cell, an output terminal of the comparison circuit, and a ground terminal, and a second discharge path electrically connected to the light emitting cell, an 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 discharge path receives the conduction signal from the output end of the comparison circuit and selectively conducts the light emitting unit and the grounding end according to the conduction signal.

8. The pixel cell of claim 7, 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 the 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 discharge path includes a second discharge switch and a second discharge resistor, wherein a control terminal of the second discharge switch is electrically connected to the output terminal of the comparison circuit, and is configured to receive the conduction signal from the output terminal of the comparison circuit, a first terminal of the second discharge switch is electrically connected to the second terminal of the light emitting unit, a second terminal of the second discharge switch is electrically connected to the first terminal of the second discharge resistor, and a second terminal of the second discharge resistor is electrically connected to the ground terminal.

9. A display panel comprising a plurality of pixel units according to any one of claims 1 to 8 and a driving circuit for driving the plurality of pixel units to emit light.

10. A display device, comprising a power module and the display panel as claimed in claim 9, wherein the power module is configured to provide a power voltage for the display panel to display images.