CN210349264U

CN210349264U - Pixel driving circuit and display panel

Info

Publication number: CN210349264U
Application number: CN201920987353.3U
Authority: CN
Inventors: 罗俊珊
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-04-17
Anticipated expiration: 2029-06-28

Abstract

The utility model discloses a pixel drive circuit and a display panel, wherein, the pixel drive circuit comprises an amplifier, two transistors, a luminescent device and a storage capacitor; the advantages are that: the pixel driving circuit can isolate the coupling influence between devices and accelerate the feedback by introducing the amplifier between negative feedback channels, and solves the delay problem of the response speed of the pixel driving circuit in the prior art.

Description

Pixel driving circuit and display panel

Technical Field

The utility model relates to an electronic circuit technical field especially relates to a pixel drive circuit and display panel.

Background

An organic electroluminescent device (OLED) is an all-solid device that directly converts electrical energy into optical energy, and a driving method of the organic electroluminescent device may be divided into Active Matrix (AM) display and Passive Matrix (PM) display according to whether a switching element is introduced or not introduced into each pixel.

The PM-OLED has the advantages of simple structure, low cost and the like, and is mainly used for simple display with low information content; AM-OLED is dominant in large information display, generally using amorphous silicon TFT (a-si TFT) or polysilicon (poly-si TFT) switching devices, and the input signal is stored on a storage capacitor to keep the pixel in the on state in the frame period, so that no transient high brightness is needed, the disadvantage of PM-OLED is overcome, and it is not limited by the duty ratio. Therefore, to realize high-quality display, the OLED must be driven by an active matrix.

AM-OLED drive implementations include both analog and digital. In a digital driving scheme, each pixel is connected to a switch, the TFT is used only as an analog switch, and a gray scale generation method includes time ratio gray scale and area ratio gray scale, or a combination of both. At present, analog pixel circuits still dominate, but in terms of gray scale implementation, the combination of analog technology and time ratio gray scale and area ratio gray scale theory will be a development trend in the future. In the analog scheme, the unit pixel circuit may be classified into a voltage control type and a current control type according to the type of an input data signal. However, the response speed of the conventional voltage-controlled or current-controlled pixel driving circuit is delayed to some extent.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide a pixel drive circuit and display panel, solved the delay problem of the pixel drive circuit response speed who exists among the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, the present invention provides a pixel driving circuit, including: the pixel driving circuit comprises an amplifier, two transistors, a light emitting device and a storage capacitor, wherein the first transistor (T1) is a pixel driving matrix addressing switch tube, and the second transistor (T2) is a driving tube of the light emitting device.

Preferably, the gate and the source of the first transistor (T1) are respectively connected to the scan line and the data line, the drain is connected to the gate of the second transistor (T2), the source of the second transistor (T2) is connected to the gate through an amplifier and is forward grounded through the light emitting device, and the drain of the second transistor (T2) is connected to the power source terminal and is connected to the gate through a storage capacitor.

Preferably, the first transistor (T1) and the second transistor (T2) have the same area.

Preferably, the first transistor (T1) and the second transistor (T2) are any one of a polysilicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor, or an organic thin film transistor.

Preferably, the light emitting device comprises any one of an OLED, DCEL, LED or resistive bulb.

In a second aspect, the present invention provides a display panel, including the pixel driving circuit of the first aspect.

The utility model has the advantages that: the utility model discloses a pixel drive and display panel can play the coupling influence between the isolation device, the problem of feedback with higher speed through introducing the amplifier between the negative feedback passageway, has solved the delay problem of the pixel drive circuit response speed who exists among the prior art.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative efforts.

Fig. 1 is a circuit diagram of an embodiment of a pixel driving circuit according to the present invention.

Detailed Description

The technical solution of the present invention will be described in further detail with reference to the accompanying drawings and embodiments, which are preferred embodiments of the present invention. It is to be understood that the described embodiments are merely a subset of the embodiments of the invention, and not all embodiments; it should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The first embodiment is as follows:

the utility model provides a pixel drive circuit, as shown in FIG. 1, include: the pixel driving circuit comprises an amplifier, two transistors, a light emitting device and a storage capacitor, wherein the first transistor (T1) is a pixel driving matrix addressing switch tube, and the second transistor (T2) is a driving tube of the light emitting device. Wherein the light emitting device comprises any one of an OLED, a DCEL, an LED, or a resistive bulb.

Specifically, the gate and the source of the first transistor (T1) are connected to the scan line and the data line, respectively, the drain is connected to the gate of the second transistor (T2), the source of the second transistor (T2) is connected to the gate through an amplifier and is forward grounded through the light emitting device, and the drain of the second transistor (T2) is connected to a power source terminal and is connected to the gate through a storage capacitor. The first transistor (T1) and the second transistor (T2) have the same area.

It is very important to introduce an amplifier for accelerating feedback between the negative feedback channels of the source and the gate of the second transistor (T2), which not only can isolate the coupling effect between the devices, but also can improve the response speed of the voltage change generated between the source and the gate of the second transistor (T2). In other words, the amplifier increases the speed of light intensity change of the pixel driving circuit.

It should be noted that the first transistor (T1) and the second transistor (T2) in this embodiment may be any one or more of a polycrystalline silicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor, or an organic thin film transistor. The transistor may have a structure in which the gate and the source of the depletion N-channel MOS transistor are connected, but it is needless to say that the transistor may have a structure in which the gate and the source of the depletion P-channel MOS transistor are connected, although not shown.

The utility model discloses a pixel drive circuit theory of operation: the gate of the first transistor (T1) is connected to a scan line, the source of the first transistor (T1) is connected to a data line, and when a scan signal of the scan line is at a high level, the first transistor (T1) is turned on, and the potential of a data signal of the data line is input to the gate of the second transistor (T2), thereby turning on the second transistor (T2). Due to the existence of the storage capacitor, the potential of the data signal can be stored at the grid electrode of the second transistor (T2), the second transistor (T2) is rapidly switched to a conducting state between turning off and turning on through a rapid negative feedback channel of the amplifier, and the current continuously flowing through the second transistor (T2) drives the light-emitting element to emit light. In this way, the pixel driving circuit converts the voltage signal of the data signal end into the driving current required by the light emitting element to drive the light emitting element to rapidly display and turn off at different gray scales.

Therefore, the embodiment of the utility model provides a following technological effect has been reached: the pixel driving circuit can isolate the coupling influence between devices and accelerate the feedback by introducing the amplifier between negative feedback channels, and solves the delay problem of the response speed of the pixel driving circuit in the prior art.

Example two:

an embodiment of the present invention provides a display panel, including the above-mentioned pixel driving circuit.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly. In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Moreover, the technical solutions in the embodiments can be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

It should also be noted that in the description of the present specification, reference to the description of the term "one embodiment", "some embodiments", "an example", "a specific example", 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to 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. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A pixel driving circuit, comprising: the pixel driving circuit comprises an amplifier, two transistors, a light emitting device and a storage capacitor, wherein the first transistor (T1) is a pixel driving matrix addressing switch tube, and the second transistor (T2) is a driving tube of the light emitting device.

2. The pixel driving circuit according to claim 1, wherein the gate and the source of the first transistor (T1) are connected to the scan line and the data line, respectively, and the drain is connected to the gate of the second transistor (T2), the source of the second transistor (T2) is connected to the gate through an amplifier and to the forward ground through the light emitting device, and the drain of the second transistor (T2) is connected to the power source terminal and to the gate through a storage capacitor.

3. The pixel driving circuit according to claim 2, wherein the first transistor (T1) and the second transistor (T2) have the same area.

4. The pixel driving circuit according to any of claims 1-3, wherein the first transistor (T1), the second transistor (T2) is any one of a polysilicon thin film transistor, an amorphous silicon thin film transistor, a zinc oxide-based thin film transistor, or an organic thin film transistor.

5. The pixel driving circuit according to claim 4, wherein the light emitting device comprises any one of an OLED, a DCEL, an LED, or a resistive bulb.

6. A display panel comprising the pixel drive circuit according to any one of claims 1 to 5.