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Pixel circuit, driving method thereof, OLED display panel and display device

A pixel circuit and display panel technology, applied to static indicators, instruments, etc., can solve the problem of uneven display, achieve the effects of eliminating afterimages, prolonging life, and avoiding excessive charging time

Active Publication Date: 2016-03-16
CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a pixel circuit and its driving method, an OLED display panel and a display device. By providing the pixel circuit with a data current signal and three voltage signals, a hybrid compensation method of voltage driving and current driving is adopted, and at the same time, the driving The threshold voltage and mobility of the transistor are compensated, which solves the problem of uneven display and improves the display effect of the entire screen

Method used

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  • Pixel circuit, driving method thereof, OLED display panel and display device
  • Pixel circuit, driving method thereof, OLED display panel and display device
  • Pixel circuit, driving method thereof, OLED display panel and display device

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Embodiment 1

[0033] figure 1 A schematic structural diagram of a pixel circuit provided by Embodiment 1 of the present invention, as shown in figure 1 As shown, the present invention proposes a pixel circuit applied to an OLED display panel, including first to fourth transistors, first and second capacitors, and a light-emitting diode OLED, wherein the first electrode of the first transistor T1, the first The second electrode of the second transistor T2 and the second electrode of the third transistor T3 are connected to the first node N1, the gate of the second transistor T2, the second electrode of the fourth transistor T4 and one end of the first capacitor C1, the second One end of the second capacitor C2 is connected to the second node N2, the gates of the third transistor T3 and the fourth transistor T4 and the other end of the first capacitor C1 are connected to the third node N3; and

[0034] A first voltage signal S1 is input to the third node N3, a second voltage signal Emit is i...

Embodiment 2

[0040] This embodiment provides a driving method for a pixel circuit, which is applied to the above-mentioned pixel circuit, and the driving method for the pixel circuit includes:

[0041] The first stage: the first voltage signal and the third voltage signal are low-level signals, the second voltage signal is a high-level signal, the second transistor is turned on, its threshold voltage and mobility are compensated, and the gate of the second transistor The voltage is charged to a certain voltage value Vx;

[0042] The second stage: the first voltage signal and the second voltage signal are high-level signals, and the third voltage signal is a low-level signal. Due to the coupling effect of the first capacitor, the gate voltage of the second transistor increases and becomes Vx+ Δx;

[0043] The third stage: the first voltage signal is a high-level signal, the second voltage signal and the third voltage signal are low-level signals, the first transistor is turned on, and the ...

Embodiment 3

[0052] This embodiment provides an OLED display panel, and the OLED display panel includes the pixel circuit described in the first embodiment.

[0053] The OLED display panel of this embodiment has the pixel circuit in the first embodiment, so by providing the data current signal and three voltage signals to the pixel circuit, the mixed compensation method of voltage driving and current driving is adopted, and at the same time, the threshold voltage of the driving transistor Compensated with the mobility, solved the problem of uneven display caused by it, and improved the display effect of the entire screen; since the first voltage signal changed from a low-level signal to a high-level signal in the second stage, the first The coupling of the capacitor increases the gate voltage of the second transistor, and the current flowing through the second transistor decreases in the second stage, which reduces the brightness in the third stage, so that when it is necessary to display a...

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Abstract

The invention provides a pixel circuit, a driving method thereof, an OLED display panel and a display device. The pixel circuit includes transistors from the first transistor to the fourth transistor, a first capacitor, a second capacitor and a light emitting diode; a data current signal is inputted into the first electrode of the third transistor and the first electrode of the fourth transistor; a first voltage signal is inputted into the gates of the third transistor and the fourth transistor as well as one end of the first capacitor; and a second voltage signal is inputted into the gate of the first transistor. By means of the data current signal and the voltage signals provided by the pixel circuit, a voltage driving and current driving hybrid compensation mode is adopted to compensate the threshold voltage and migration rate of the driving transistors, and therefore, the problem of uneven display can be solved, and the display effect of a whole picture can be improved.

Description

technical field [0001] The invention relates to the technical field of plane display, in particular to a pixel circuit and a driving method thereof, an OLED display panel and a display device. Background technique [0002] Active Matrix Organic Light Emitting Diode (AMOLED) display is a display technology used in TVs and mobile devices. It is used in portable electronic devices sensitive to power consumption due to its low power consumption, low cost and large size. It has broad application prospects. [0003] The organic light emitting diode (Organic Light Emitting Diode, referred to as OLED) in AMOLED can emit light and is driven by the driving current generated by the thin film transistor (Thin Film Transistor, referred to as TFT), but due to the problem of inhomogeneity in the process of low temperature polysilicon (LTPS), it will cause There are non-uniform phenomena in the characteristics of the driving transistors, such as threshold voltage, mobility, etc., resulting...

Claims

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Application Information

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IPC IPC(8): G09G3/3258
CPCG09G3/3233G09G3/3258
Inventor 王瑞彬
Owner CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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