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Pixel circuit and drive method thereof as well as display panel

A technology of pixel circuits and driving transistors, applied in static indicators, instruments, etc., can solve the problems of current difference, poor display effect, poor brightness uniformity, etc., and achieve the effect of improving uniformity and good display effect.

Active Publication Date: 2014-11-19
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the pixel's V thn Drift over time may cause different currents successively, resulting in residual image
And due to the non-uniformity of the OLED device, the OLED operating voltage is different, which will also cause the current difference
It will eventually lead to poor brightness uniformity and poor display effect

Method used

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  • Pixel circuit and drive method thereof as well as display panel
  • Pixel circuit and drive method thereof as well as display panel
  • Pixel circuit and drive method thereof as well as display panel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, the 5T2C circuit is used to compensate Vth, so that I=K(Vgs-Vth) of the drive tube 2 Regardless of the threshold voltage Vth of the drive transistor, the current flowing through the OLED is consistent and the uniformity is improved. Specific as figure 2 As shown, the pixel circuit of this embodiment includes: gate line SCAN, data line DATA, power line V, first signal line CR1, second signal line CR2, ground electrode GND, first switching transistor T1, second switching transistor T2 , a third switching transistor T3, a fourth switching transistor T4, a driving transistor DTFT, a first storage capacitor C1, a second storage capacitor C2 and an OLED device. Among them, five transistors are all P-type transistors.

[0033] The gate of the first switching transistor T1 is connected to the gate line SCAN, the source is connected to the data line DATA, and the drain is connected to the first end of the first storage capacitor C1. The storage capacitor ...

Embodiment 2

[0044] This embodiment provides a display panel, including the pixel circuit in Embodiment 1, the pixel circuit is formed on an array substrate, and the array substrate is provided with a plurality of data lines and gate lines, and a plurality of data lines and gate lines A plurality of the above-mentioned pixel circuits are defined; the array substrate further includes a driver chip for providing timing signals for gate lines, data lines, first signal lines and second signal lines, and power supply signals for power lines.

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Abstract

The invention discloses a pixel circuit and relates to the technical field of organic light emitting display. The grid of a first switch transistor of the circuit is connected with a grid line, the source of the first switch transistor is connected with a data line and the drain of the first switch transistor is connected with a first end of a first storage capacitor; the grid of a third switch transistor is connected with the grid line, the source of the third switch transistor is connected with a power line and the drain of the third switch transistor is connected with a first end of a second storage capacitor; the grid of a drive transistor is connected with the second end of the first storage capacitor and a second end of a second storage capacitor, the source of the drive transistor is connected with the first end of the second storage capacitor and the cathode of an OLED (Organic Light Emitting Display) device so as to provide a drive current for the OLED device, and the anode of the OLED device is connected with the power line. The invention further discloses a drive method and an OLED panel. According to the invention, by compensating the drift of the threshold voltage of the drive transistor, the uniformity of the current flowing through the OLED device is improved, and the display effect is enhanced.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, in particular to a pixel circuit, a driving method thereof, and a display panel. Background technique [0002] The active matrix organic light emitting diode panel (Active Matrix / Organic Light Emitting Diode, AMOLED) can emit light is driven by the current generated by driving the thin film field effect transistor (Thin Film Transistor, TFT) in the saturated state, because the same input When the grayscale voltage is used, different threshold voltages will generate different driving currents, resulting in inconsistency of the currents. The uniformity of Vth in the low temperature polysilicon (LTPS) process is very poor, and the Vth also drifts. Therefore, the brightness uniformity of the traditional 2T1C circuit is very poor. [0003] figure 1 It is a traditional voltage-driven pixel circuit structure (2T1C) composed of 2 TFT transistors and 1 capacitor. Among th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3233
Inventor 祁小敬谭文吴博高永益
Owner BOE TECH GRP CO LTD
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