Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit

A technology of pixel driving circuit and driving tube, which is applied in the direction of cathode ray tube indicator, instrument, static indicator, etc., can solve the problems of uneven brightness of the panel and reducing the performance of OLED display.

Inactive Publication Date: 2013-05-08
陈鑫 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to process deviation and inconsistent working status, the threshold voltage of the driving tube in different pixel driving circuits will be different, which will lead to uneven brightness of the panel and reduce the display performance of OLED

Method used

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  • Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit
  • Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit
  • Novel active matrix/organic light emitting diode (AMOLED) pixel driving circuit

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Embodiment Construction

[0021] Such as figure 2 Shown is the pixel driving circuit of the present invention. It has four input ports, which are scanning signal SCAN, sensing signal SENSE, luminous control signal EM and drive tube substrate voltage signal SUB; one input and output port is brightness data signal DATA; the pixel driving circuit consists of four PMOS transistors T1, T2, T3 and T4, composed of a capacitor C and an organic light-emitting diode OLED; the source of the T1 tube is connected to the brightness data signal, the gate is connected to the scanning signal, and the drain is connected to the gate of T2, the source of T3 and the capacitor The port 2 of C is connected; T2 is the driving tube of the pixel driving circuit, the source of T2 is connected with the port 1 of the capacitor C and the power supply VDD, the drain of T2 is connected with the drain of T3 and the source of T4, and the substrate of T2 It is connected to the substrate voltage signal of the drive tube; the gate of T3...

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Abstract

The invention discloses a novel active matrix / organic light emitting diode (AMOLED) pixel driving circuit. The structure of the circuit is beneficial for being tested by a digital testing module composed of an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a controller and other modules, and carries out compensation for threshold voltage excursion caused by the aging of a driving tube. The novel AMOLED pixel driving circuit has three advantages of carrying out automatic compensation for the threshold voltage excursion caused by the aging of the driving tube, being capable of testing the threshold voltage compensation effect of the driving tube after the manufacturing of the driving tube is completed, and being capable of extracting the threshold voltage in real time matched with external equipment and providing a basis for carrying threshold compensation with various methods.

Description

technical field [0001] The invention relates to a pixel drive circuit for an organic light emitting diode. The digital test module modifies the DATA voltage to compensate the threshold voltage shift of the drive tube caused by the aging of the pixel drive circuit. The circuit also has the effect of quickly checking the compensation of the threshold voltage of the drive tube. function. Background technique [0002] In recent years, with the continuous increase of digital consulting and multimedia applications, as well as the promotion of major display manufacturers in the world, flat-panel displays have penetrated into every family and individual rapidly, and human beings are looking forward to high-quality video displays. Organic light-emitting diode displays (OLEDs) have attracted much attention due to their light weight, thin size, fast response, high brightness, power saving, high contrast, wide viewing angle, and low cost. [0003] Due to the various advantages of OLED...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225G09G5/10
Inventor 陈鑫黄辉
Owner 陈鑫
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