CN116863862A - Pixel circuit, display panel and display device - Google Patents

Pixel circuit, display panel and display device Download PDF

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Publication number
CN116863862A
CN116863862A CN202310945793.3A CN202310945793A CN116863862A CN 116863862 A CN116863862 A CN 116863862A CN 202310945793 A CN202310945793 A CN 202310945793A CN 116863862 A CN116863862 A CN 116863862A
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CN
China
Prior art keywords
voltage
thin film
film transistor
light
pixel circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310945793.3A
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Chinese (zh)
Inventor
刘彦宇
杨璐
史大为
李柯远
解洋
温宵松
林自信
郭加琛
赵天龙
范福卓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Chongqing BOE Display Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Chongqing BOE Display Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by BOE Technology Group Co Ltd, Chongqing BOE Display Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to CN202310945793.3A priority Critical patent/CN116863862A/en
Publication of CN116863862A publication Critical patent/CN116863862A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects

Abstract

The application provides a pixel circuit, a display panel and display equipment, and relates to the technical field of display, wherein the pixel circuit comprises: a light-emitting driving circuit, a light-emitting element, an eighth thin film transistor, and a constant voltage terminal; wherein the light-emitting driving circuit provides driving current for the light-emitting element; the first electrode of the thin film transistor is connected with the light emitting element, the control electrode of the eighth thin film transistor is connected with the data signal line of the light emitting driving circuit, and the second electrode of the thin film transistor is connected with the constant voltage end. The pixel circuit can turn on the red pixel when the light-emitting element has low gray scale, and solves the technical problem that the light-emitting element has low gray scale and is greenish in color.

Description

Pixel circuit, display panel and display device
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel circuit, a display panel, and a display device.
Background
At present, the material characteristics of the light-emitting element enable red pixels to be difficult to turn on and light under low gray scale, and the response is slow, so that the display color is greenish, and display problems such as smear, poor image quality and the like are generated on the display screen.
Therefore, the enhancement of the red pixel response capability of the light emitting element is very important for enhancing the display effect of low gray scale, but no effective solution has been proposed for this problem.
Disclosure of Invention
In view of the above, the present application provides a pixel circuit, a display panel and a display device, so as to solve the technical problem that red pixels are difficult to turn on and light under low gray scale of a light emitting element.
In a first aspect, an embodiment of the present application provides a pixel circuit, including: a light-emitting driving circuit, a light-emitting element, an eighth thin film transistor, and a constant voltage terminal; wherein the light-emitting driving circuit provides driving current for the light-emitting element; the first electrode of the eighth thin film transistor is connected with the light emitting element, the control electrode of the eighth thin film transistor is connected with the data signal line of the light emitting driving circuit, and the second electrode of the eighth thin film transistor is connected with the constant voltage end.
In one possible implementation, the threshold voltage of the eighth thin film transistor is less than the difference between the first voltage and the second voltage; the first voltage is the starting voltage of the red pixel of the light-emitting element; the second voltage is the voltage of the constant voltage terminal.
In one possible implementation, the voltage of the data signal line of the light-emitting driving circuit is greater than or equal to the first voltage, and the eighth thin film transistor is turned on.
In one possible implementation, the voltage of the data signal line of the light emitting driving circuit is smaller than the first voltage, and the eighth thin film transistor is turned off.
In one possible implementation, the eighth thin film transistor is an N-type thin film transistor.
In one possible implementation, the light-emitting driving circuit includes seven thin film transistors and one storage capacitor.
In a second aspect, an embodiment of the present application provides a display panel including the pixel circuit of the above embodiment.
In a third aspect, an embodiment of the present application provides a display apparatus, including: a brightness adjusting part, a voltage adjusting module and the display panel of the above embodiment;
the brightness adjustment section is configured to: generating a brightness adjustment signal in response to a brightness adjustment operation;
the voltage adjustment module is configured to: and adjusting the voltage of a data signal line of a light-emitting driving circuit of a pixel circuit of the display panel according to the brightness adjusting signal.
In one possible implementation, when the voltage of the data signal line is greater than or equal to the first voltage, an eighth thin film transistor in the pixel circuit of the display panel is turned on; the constant voltage end in the pixel circuit of the display panel compensates the voltage of the light-emitting driving circuit, so that the red pixel of the light-emitting element is turned on; the first voltage is a starting voltage of a red pixel of the light-emitting element.
In one possible implementation, when the voltage of the data signal line is less than the first voltage, the eighth thin film transistor in the pixel circuit of the display panel is turned off.
The pixel circuit can turn on the red pixel when the light-emitting element has low gray scale, and solves the technical problem that the light-emitting element has low gray scale and is greenish in color.
Drawings
FIG. 1 is a functional block diagram of a pixel circuit according to an embodiment of the present application;
FIG. 2 is a circuit diagram of an embodiment of a pixel circuit according to the present application;
FIG. 3 is a timing diagram illustrating operation of a pixel circuit according to an embodiment of the application;
fig. 4 is a functional block diagram of a display device according to an embodiment of the present application.
Detailed Description
Various aspects and features of the present application are described herein with reference to the accompanying drawings.
It should be understood that various modifications may be made to the embodiments of the application herein. Therefore, the above description should not be taken as limiting, but merely as exemplification of the embodiments. Other modifications within the scope and spirit of the application will occur to persons of ordinary skill in the art.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with a general description of the application given above, and the detailed description of the embodiments given below, serve to explain the principles of the application.
These and other characteristics of the application will become apparent from the following description of a preferred form of embodiment, given as a non-limiting example, with reference to the accompanying drawings.
It is also to be understood that, although the application has been described with reference to some specific examples, those skilled in the art can certainly realize many other equivalent forms of the application.
The above and other aspects, features and advantages of the present application will become more apparent in light of the following detailed description when taken in conjunction with the accompanying drawings.
Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are merely exemplary of the application, which can be embodied in various forms. Well-known and/or repeated functions and constructions are not described in detail to avoid obscuring the application in unnecessary or unnecessary detail. Therefore, specific structural and functional details disclosed herein are not intended to be limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present application in virtually any appropriately detailed structure.
The specification may use the word "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which may each refer to one or more of the same or different embodiments in accordance with the application.
First, the design idea of the embodiment of the present application will be briefly described.
Unlike conventional rigid screens, the flexible screen does not use rigid glass as a substrate, adopts an organic material as a flexible substrate, and is made by a thin film packaging technology, and a protective film is stuck on the back surface of the panel, so that the panel becomes bendable and is not easy to break. Compared with the traditional screen, the flexible screen has obvious advantages, is lighter and thinner in size and lower in power consumption, and is beneficial to improving the cruising ability of the equipment.
The Light Emitting element of the flexible screen is an Organic Light-Emitting Diode (OLED), and in order to reduce power consumption, the response capability of the Light Emitting element and the difference of R/G/B Light Emitting materials must be considered, and the influence of device crosstalk determines that the two characteristics contradict each other, so how to improve the response capability of the Light Emitting element under the condition that the crosstalk level of the Light Emitting element is kept unchanged and the single color relatively difference before and after the reliability is small becomes a great difficulty in improving the current flexible screen.
One particular problem is: when the organic light emitting diode is in low gray level, the red pixels are not bright and the green pixels are bright, so that the color is greenish, and the display effect of the flexible screen is poor.
Therefore, the application provides a pixel circuit with an 8T1C (8 thin film transistors TFT,1 capacitor C) structure by utilizing LTPO (low temperature polycrystalline oxide) process flow, wherein an eighth thin film transistor T8 and a Voffset constant voltage signal line are added on the anode of the original circuit with a 7T1C (7 thin film transistors TFT,1 capacitor C) structure, and the eighth thin film transistor T8 is started in low gray level, so that the voltage of the Voffset signal line performs voltage compensation on the light emission of the organic light emitting diode; the eighth thin film transistor T8 is turned off in the high gray scale without affecting the original 7T1C circuit, and the function of the eighth thin film transistor T8 is a voltage compensation control switch.
When the pixel circuit is in low gray level, the eighth thin film transistor T8 is started to enable the voltage of the Voffset signal line to carry out voltage compensation on the anode of the 7T1C circuit, so that the red pixel under the low gray level is turned on, and the technical problem of greenish color caused by difficult turning on of the red pixel under the low gray level is solved; thereby improving the display effect of the display device.
After the application scenario and the design idea of the embodiment of the present application are introduced, the technical solution provided by the embodiment of the present application is described below.
As shown in fig. 1, an embodiment of the present application provides a pixel circuit, including: a light-emitting driving circuit, a light-emitting element, an eighth thin film transistor, and a constant voltage terminal; wherein the light-emitting driving circuit provides driving current for the light-emitting element; the first electrode of the eighth thin film transistor is connected with the light emitting element, the control electrode of the eighth thin film transistor is connected with the data signal line of the light emitting driving circuit, and the second electrode of the eighth thin film transistor is connected with the constant voltage end.
As illustrated in fig. 2, the light emission driving circuit adopts a 7T1C circuit structure, namely, seven thin film transistors TFTs and one storage capacitor C, for example. The light emitting element is an organic light emitting diode OLED.
In particular, it should be noted that: for a thin film transistor, the first pole may be a drain or a source, the second pole may be a source when the first pole is a drain, and the second pole may be a drain when the first pole is a source. In the thin film transistor of this embodiment, the first electrode is the drain electrode, the second electrode is the source electrode, and the control electrode is the gate electrode.
In the light-emitting driving circuit of fig. 2, the connection relation of the components is as follows:
the control electrode of the first thin film transistor T1 receives a Reset signal reset_P; the first electrode of the first thin film transistor T1 is connected to a first initial voltage Vint1 (negative voltage); the second pole of the first thin film transistor T1 is connected with one end of the capacitor Cst; the other end of the capacitor Cst is connected to the first power supply terminal VDD.
The control electrode of the fifth thin film transistor T5 receives the control light emitting signal EM, the second electrode of the fifth thin film transistor T5 is connected to the first power supply terminal VDD, and the first electrode of the fifth thin film transistor T5 is connected to the second electrode of the third thin film transistor T3.
The control electrode of the third thin film transistor T3 is connected between the capacitor Cst and the first thin film transistor T1; the first pole of the third thin film transistor T3 is connected to the second pole of the sixth thin film transistor T2.
The control electrode of the sixth thin film transistor T6 receives the control light emitting signal EM, and the first electrode of the sixth thin film transistor T6 is connected to the organic light emitting diode OLED, which is connected to the second power supply terminal VSS.
A control electrode of the second thin film transistor T2 receives a first Gate signal gate_N, and a first electrode of the second thin film transistor T2 is connected between a T3 access point and the first thin film transistor T1; the second pole access point of the second thin film transistor T2 is located between the third thin film transistor T3 and the sixth thin film transistor T6.
A control electrode of the fourth thin film transistor T4 is connected to the second Gate signal gate_p, a first electrode of the fourth thin film transistor T4 is connected between the fifth thin film transistor T5 and the third thin film transistor T3, and a second electrode of the fourth thin film transistor T4 is connected to a data signal line (voltage is represented by Vdata); wherein Vdata ranges from 1 to 6.8V; for controlling the switching of the third thin film transistor T3.
The control electrode of the seventh thin film transistor T7 receives a second Gate signal gate_P; the second pole of the seventh thin film transistor T7 is connected between the sixth thin film transistor T6 and the organic light emitting diode OLED, and the first pole of the seventh thin film transistor T7 is connected to the second initial voltage Vint2 (negative voltage).
Based on the above 7T1C circuit structure, specifically, as shown in fig. 2, the first electrode of the eighth thin film transistor T8 of the present embodiment is connected between the seventh thin film transistor T7 and the organic light emitting diode OLED; the control electrode of the thin film transistor is connected with the data signal line, and the constant voltage end is a VOffset signal line for providing constant voltage; the second pole of the thin film transistor is connected with the VOffset signal line.
When the eighth thin film transistor T8 and the VOffset signal line are not connected, the operation timing of the light emission driving circuit is:
first stage (reset stage): the control electrode of the first thin film transistor T1 receives a Reset signal reset_P, the first thin film transistor T1 is turned on, the control electrode of the third thin film transistor T3 receives a first initial voltage Vinit1, and the third thin film transistor T3 is turned on;
second stage (compensation stage): the first thin film transistor T1 is turned off, the control electrode of the second thin film transistor T2 receives a first Gate signal gate_N, and the second thin film transistor T2 is turned on; the control electrodes of the fourth thin film transistor T4 and the seventh thin film transistor T7 receive the second Gate signal gate_P, the fourth thin film transistor T4 and the seventh thin film transistor T7 are both turned on, and the voltage Vdata of the data signal line is written into the third thin film transistor T3 until the voltage reaches Vdata+Vt3, wherein the threshold voltage of the Vt3 third thin film transistor T3; simultaneously charging the capacitor Cst;
third stage (light-emitting stage): the fourth thin film transistor T4 and the seventh thin film transistor T7 are turned off, and the second thin film transistor T2 is turned off; the control electrode of the fifth thin film transistor T5 and the control electrode of the sixth thin film transistor receive the light emitting signal EM, and when both the fifth thin film transistor T5 and the sixth thin film transistor T6 are turned on, the first power supply terminal VDD and the second power supply terminal VSS are turned on, and the organic light emitting diode OLED emits light.
In order to obtain a red pixel of the organic light emitting diode OLED at the low gray level Shi Qiliang, the first voltage Vdata0 of the red pixel is obtained by adjusting the voltage Vdata of the data signal line; this is a threshold voltage, and when Vdata is smaller than Vdata0, the red pixel is bright, and when Vdata is equal to or larger than Vdata0, the red pixel is changed from bright to non-bright in the process that Vdata is changed from small to large. Or alternatively; when Vdata is equal to or greater than Vdata0, the red pixel is not bright, and in the process of Vdata changing from large to small, when Vdata is less than Vdata0, the red pixel is not bright to bright.
Therefore, in a specific implementation of the pixel circuit, the voltage VOffset of the VOffset signal line may be set to any one voltage value smaller than Vdata 0. After the voltage of the VOffset signal line is set, the eighth thin film transistor T8 may be selected, which needs to satisfy: its threshold voltage is greater than the difference between Vdata0 and Voffset.
Preferably, in order to reduce leakage of the third thin film transistor T3, the second thin film transistor T2 uses an N-type thin film transistor. The first thin film transistor T1, the third thin film transistor T3, the fourth thin film transistor T4, the fifth thin film transistor T5, the sixth thin film transistor T6 and the seventh thin film transistor T7 are P-type thin film transistors. The eighth thin film transistor T8 is an N-type thin film transistor.
The realization of the pixel circuit requires that a VOffset constant voltage signal wiring is additionally added in an AA (Active Area) Area, the process is similar to an anode power supply VDD, and all designs can be realized by utilizing the existing LTPO 7T1C circuit and the existing process; according to practical requirements, it is possible to achieve an individual addition of the design to either the red or blue pixels without affecting the green pixels.
It can be seen that, since the voltage Voffset is already fixed, the voltage Vdata of the data signal line is a voltage controlling the eighth thin film transistor T8 to switch, that is, when the voltage Vdata of the data signal line is smaller than Vdata0, the organic light emitting diode OLED is at a high gray level, the voltage of the data signal line is at a low potential, at this time, the voltage difference VGS of the eighth thin film transistor T8 is equal to Vdata minus Voffset, the voltage difference VGS is smaller than the threshold voltage Vth of the eighth thin film transistor T8, the eighth thin film transistor T8 is always turned off, the voltage of the Voffset signal line cannot be written into the anode of the 7T1C circuit, and the organic light emitting diode OLED operates at the same time as the conventional 7T1C circuit;
when the voltage Vdata of the data signal line is greater than or equal to Vdata0, the organic light emitting diode OLED is at a low gray level, the voltage of the data signal line is at a high potential, the voltage difference VGS of the eighth thin film transistor T8 is greater than the threshold voltage Vth, the eighth thin film transistor T8 is turned on, and the voltage of the VOffset signal line is written into the anode of the 7T1C circuit, so that the red pixel of the organic light emitting diode OLED is turned on. Tests show that the larger Vdata is, the lower the gray level is, and the better the compensation effect is.
Therefore, the threshold voltage Vth of the thin film transistor is smaller than the difference between the first voltage Vdata0 and the voltage VOffset of the VOffset signal line; the first voltage is a turn-on voltage of a red pixel of the organic light emitting diode OLED.
In summary, the voltage of the data signal line is greater than or equal to the first voltage, the thin film transistor is turned on, and the voltage of the VOffset signal line is written into the anode of the light-emitting driving circuit to perform voltage compensation. The voltage of the data signal line is smaller than the first voltage, and the thin film transistor is turned off.
As shown in fig. 3, the operation timing of the pixel circuit of the present embodiment is:
the first stage: the control electrode of the first thin film transistor T1 receives a Reset signal reset_P, the first thin film transistor T1 is turned on, the control electrode of the third thin film transistor T3 receives a first initial voltage Vinit1, and the third thin film transistor T3 is turned on;
and a second stage: the first thin film transistor T1 is turned off, the control electrode of the second thin film transistor T2 receives a first Gate signal gate_N, and the second thin film transistor T2 is turned on; the control electrodes of the fourth thin film transistor T4 and the seventh thin film transistor T7 receive the second Gate signal gate_P, the fourth thin film transistor T4 and the seventh thin film transistor T7 are both turned on, and the voltage Vdata of the data signal line is written into the third thin film transistor T3 until Vdata+Vt3, wherein the threshold voltage of the Vth3 third thin film transistor T3; simultaneously charging the capacitor Cst;
and a third stage: the fourth thin film transistor T4 and the seventh thin film transistor T7 are turned off, and the second thin film transistor T2 is turned off; the control electrode of the fifth thin film transistor T5 and the control electrode of the sixth thin film transistor receive the light-emitting signal EM, the fifth thin film transistor T5 and the sixth thin film transistor T6 are both turned on, the first power supply end VDD and the second power supply end VSS are conducted, and the organic light-emitting diode OLED emits light; when the voltage Vdata of the data signal line is greater than or equal to the first voltage Vdata0, the organic light emitting diode OLED is at a low gray level, the voltage difference VGS of the eighth thin film transistor T8 is greater than the threshold voltage Vth, the eighth thin film transistor T8 is turned on, and the voltage of the VOffset signal line is written into the anode, so that the red pixel of the organic light emitting diode OLED is turned on. When the voltage Vdata of the data signal line is smaller than the first voltage Vdata0 and the organic light emitting diode OLED is at a high gray level, the voltage difference VGS of the eighth thin film transistor T8 is smaller than the threshold voltage Vth, the eighth thin film transistor T8 is turned off, and the voltage of the VOffset signal line does not affect the original circuit.
Based on the same inventive concept, this embodiment provides a display panel including the pixel circuit of the above embodiment.
Preferably, the display panel in this embodiment is a display panel in the form of an organic light emitting diode, such as a flexible screen. The display panel of the present embodiment has the same technical effects as the pixel circuit.
Based on the same inventive concept, an embodiment of the present application provides a display apparatus, as shown in fig. 4, including: a brightness adjusting part, a voltage adjusting module and the display panel of the above embodiment;
the brightness adjustment section is configured to: generating a brightness adjustment signal in response to a brightness adjustment operation;
the voltage adjustment module is configured to: and adjusting the voltage of a data signal line of a light-emitting driving circuit of a pixel circuit of the display panel according to the brightness adjusting signal.
Further, when the voltage of the data signal line is greater than or equal to the first voltage, an eighth thin film transistor in the pixel circuit of the display panel is turned on; the constant voltage end in the pixel circuit of the display panel compensates the voltage of the light-emitting driving circuit, so that the red pixel of the light-emitting element is turned on; the first voltage is a starting voltage of a red pixel of the light-emitting element.
When the voltage of the data signal line is smaller than the first voltage, the eighth thin film transistor in the pixel circuit of the display panel is turned off.
The display device shown in fig. 4 is only a schematic illustration, and the display device may be any electronic device having a display function, such as an in-vehicle display apparatus, a mobile phone, a tablet computer, a notebook computer, a display, or a television; the embodiment of the present application is not particularly limited.
For example, when the display device is a mobile phone, a tablet computer, or a notebook computer, the brightness adjustment operation is a sliding brightness display bar; when the display device is a display or a television, the brightness adjustment operation is to press a brightness adjustment button.
Because the display device of the embodiment is provided with the pixel circuit, when the brightness is adjusted to be low gray level, the eighth thin film transistor T8 is started to enable the voltage of the Voffset signal line to perform voltage compensation on the anode of the light-emitting driving circuit, so that the red pixels of the light-emitting element under the low gray level are started to be bright, and the display effect of the display device under the low gray level is improved; the eighth thin film transistor T8 is turned off at a high gray level, and the Voffset signal line voltage does not affect the light emitting driving circuit.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims (10)

1. A pixel circuit, comprising: a light-emitting driving circuit, a light-emitting element, an eighth thin film transistor, and a constant voltage terminal; wherein the light-emitting driving circuit provides driving current for the light-emitting element; the first electrode of the eighth thin film transistor is connected with the light emitting element, the control electrode of the eighth thin film transistor is connected with the data signal line of the light emitting driving circuit, and the second electrode of the eighth thin film transistor is connected with the constant voltage end.
2. The pixel circuit according to claim 1, wherein a threshold voltage of the eighth thin film transistor is smaller than a difference between the first voltage and the second voltage; the first voltage is the starting voltage of the red pixel of the light-emitting element; the second voltage is the voltage of the constant voltage terminal.
3. The pixel circuit according to claim 2, wherein a voltage of the data signal line of the light-emitting drive circuit is equal to or higher than the first voltage, and the eighth thin film transistor is turned on.
4. The pixel circuit according to claim 2, wherein a voltage of the data signal line of the light-emitting drive circuit is smaller than the first voltage, and the eighth thin film transistor is turned off.
5. The pixel circuit according to claim 1, wherein the eighth thin film transistor is an N-type thin film transistor.
6. The pixel circuit according to claim 1, wherein the light-emitting driver circuit includes seven thin film transistors and one storage capacitor.
7. A display panel comprising the pixel circuit of any one of claims 1-6.
8. A display device, characterized by comprising: a brightness adjusting part, a voltage adjusting module, and the display panel of claim 7;
the brightness adjustment section is configured to: generating a brightness adjustment signal in response to a brightness adjustment operation;
the voltage adjustment module is configured to: and adjusting the voltage of a data signal line of a light-emitting driving circuit of a pixel circuit of the display panel according to the brightness adjusting signal.
9. The display device according to claim 8, wherein when the voltage of the data signal line is equal to or higher than the first voltage, an eighth thin film transistor in a pixel circuit of the display panel is turned on; the constant voltage end in the pixel circuit of the display panel compensates the voltage of the light-emitting driving circuit, so that the red pixel of the light-emitting element is turned on; the first voltage is a starting voltage of a red pixel of the light-emitting element.
10. The display device according to claim 9, wherein when the voltage of the data signal line is smaller than the first voltage, an eighth thin film transistor in a pixel circuit of the display panel is turned off.
CN202310945793.3A 2023-07-28 2023-07-28 Pixel circuit, display panel and display device Pending CN116863862A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310945793.3A CN116863862A (en) 2023-07-28 2023-07-28 Pixel circuit, display panel and display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310945793.3A CN116863862A (en) 2023-07-28 2023-07-28 Pixel circuit, display panel and display device

Publications (1)

Publication Number Publication Date
CN116863862A true CN116863862A (en) 2023-10-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310945793.3A Pending CN116863862A (en) 2023-07-28 2023-07-28 Pixel circuit, display panel and display device

Country Status (1)

Country Link
CN (1) CN116863862A (en)

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