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Pixel circuit, organic electroluminescent display panel and display device

A pixel circuit and light-emitting device technology, applied in static indicators, instruments, etc., can solve problems such as uneven brightness of images, and achieve the effect of improving uniformity

Inactive Publication Date: 2014-12-17
SHANGHAI TIANMA AM OLED +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes the current flowing through each OLED to vary depending on the threshold voltage V of the drive transistor th and the source voltage VDD of the drive transistor vary, resulting in uneven brightness of the image

Method used

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  • Pixel circuit, organic electroluminescent display panel and display device
  • Pixel circuit, organic electroluminescent display panel and display device
  • Pixel circuit, organic electroluminescent display panel and display device

Examples

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Effect test

example 1

[0090] by Figure 4a The structure of the pixel circuit shown is taken as an example to describe its working process, in which Figure 4a In the pixel circuit shown, the driving transistor is a P-type transistor, and all switching transistors are P-type transistors. Each P-type transistor is turned off under the action of a high level and turned on under the action of a low level; the corresponding input timing diagram is as follows Figure 3a shown. Specifically, choose the Figure 3a The four stages T1, T2, T3 and T4 in the input timing diagram shown.

[0091] In the T1 stage, Scan1=0, Scan2=1, Scan3=1, Emit=1. The second switch transistor T2 , the third switch transistor T3 , the fourth switch transistor T4 and the fifth switch transistor T5 are all in an off state, and the first switch transistor T1 is in an on state. The reset signal Reset is transmitted to the first node A through the turned-on first switching transistor T1, so that the driving transistor T0 is turne...

example 2

[0096] by Figure 4b The structure of the pixel circuit shown is taken as an example to describe its working process, in which Figure 4b In the pixel circuit shown, the driving transistor is a P-type transistor, and all switching transistors are N-type transistors. Each N-type transistor is turned off under the action of a low level and turned on under the action of a high level; the corresponding input timing diagram is as follows Figure 3b shown. Specifically, choose the Figure 3b The four stages T1, T2, T3 and T4 in the input timing diagram shown.

[0097] In the T1 stage, Scan1=1, Scan2=0, Scan3=0, Emit=0. The second switch transistor T2 , the third switch transistor T3 , the fourth switch transistor T4 and the fifth switch transistor T5 are all in an off state, and the first switch transistor T1 is in an on state. The reset signal Reset is transmitted to the first node A through the turned-on first switching transistor T1, so that the driving transistor T0 is turne...

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Abstract

The invention discloses a pixel circuit, an organic electroluminescent display panel and a display device, which comprise a driving transistor, a light-emitting device, a reset control module, a compensation control module, a data writing module, a light emission control module and a voltage regulator module. Due to the fact that the compensation control module in a pixel device is capable of compensating drift of a threshold voltage, working currents for driving the light-emitting device to light in the driving transistor is made to be only related to voltage of a data signal and a reset signal regardless of the threshold voltage and a second voltage source. As a result, effects of the threshold voltage and resistance drop on currents flowing through the light-emitting device are avoided, the working currents for driving the light-emitting device to light are consistent, and uniformity of brightness of the image in a display area of the display device is improved.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to a pixel circuit, an organic electroluminescence display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hot spots in the field of flat panel display research today. Compared with liquid crystal displays, OLED has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. , OLEDs have begun to replace traditional Liquid Crystal Displays (LCDs) in the field of flat panel displays such as mobile phones, PDAs, and digital cameras. Among them, pixel circuit design is the core technical content of OLED display, which has important research significance. [0003] Unlike LCD, which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission. Due to reasons such as process techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3258
Inventor 李玥钱栋
Owner SHANGHAI TIANMA AM OLED
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