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Complementary driving type pixel circuit

A pixel circuit, complementary driving technology, applied in instruments, static indicators, etc., can solve the problems of threshold voltage drift, halving of working time, poor compensation effect, etc., to achieve compensation for threshold voltage drift, prolong service life, simple How it works

Inactive Publication Date: 2011-01-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a complementary driving pixel circuit, which can not only solve the problem of the threshold voltage drift of the driving TFT in the voltage driving pixel circuit, but also enable the OLED to be driven by two driving TFT cycles in parallel. In addition, the compensation effect of the present invention has nothing to do with the scan time, and can solve the problem of pixel circuits displayed by three-dimensional AMOLEDs. Issue with poor compensation for threshold voltage drift due to short sweep times

Method used

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Embodiment Construction

[0022] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0023] In the following examples, V dd For the power input, V scan is the scanning voltage, V data is the data voltage, V recover is the reset voltage, V in1 For the data voltage input, V in2 Input for reset voltage.

[0024] like figure 1 As shown, the pixel circuit of this embodiment includes: an organic light emitting diode OLED and a driving circuit, wherein: the anode of the organic light emitting diode OLED is connected to the power supply V dd Connected, the cathode is connected to the output terminal of the driving circuit and obtains the driving current; the driving circuit includes two symmetrical ...

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Abstract

The invention provides a complementary driving type pixel circuit in the technical field of organic light emitting diodes (OLEDs), comprising an OLED and a driving circuit, wherein the anode of the OLED is connected with a power supply while the cathode thereof is connected with the output end of the driving circuit to obtain driving current. The invention not only can solve the threshold voltage drift problem of a driving TFT (Thin Film Transistor) of a voltage-type driving pixel circuit in a three-dimensional AMOLED (Active Matrix Organic Light Emitting Diode), but also can enable two parallel driving TFTs to periodically supply power to the OLED to halve the work time of the TFTs so as to prolong the service life of the TFTs and finally achieve the effect of prolonging the service life of the AMOLED.

Description

technical field [0001] The present invention relates to a device in the technical field of organic light emitting diodes, in particular to a complementary driving pixel circuit. Background technique [0002] Active matrix organic light-emitting diodes (AMOLED) will become the main force of the next generation of displays due to their active light emission, simple structure, low power consumption, and flexible display. The principle of AMOLED is that each pixel has a driving circuit composed of a thin film transistor (TFT) and a storage capacitor. The signal is charged to and stored in the storage capacitor during the charging phase, so as to ensure continuous light emission during the OLED lighting phase. AMOLED pixel circuits can be divided into voltage-driven circuits and current-driven circuits according to different data signals. However, since the signal delay phenomenon of the current driving pixel circuit is significant, and there is still no effective solution so fa...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3258G09G3/3291
Inventor 徐小丽郭小军
Owner SHANGHAI JIAO TONG UNIV
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