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Pixel circuit, driving method thereof and active matrix OLED (organic lighting emitting diode)

A technology of a pixel circuit and a driving method, applied in the field of flat panel display, can solve problems such as uneven brightness, achieve the effects of realizing compensation, avoiding threshold voltage deviation, and realizing IR voltage drop

Active Publication Date: 2015-04-01
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a pixel circuit and its driving method and an active matrix organic light emitting display to solve the problem of uneven brightness in the existing active matrix organic light emitting display

Method used

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  • Pixel circuit, driving method thereof and active matrix OLED (organic lighting emitting diode)
  • Pixel circuit, driving method thereof and active matrix OLED (organic lighting emitting diode)
  • Pixel circuit, driving method thereof and active matrix OLED (organic lighting emitting diode)

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Embodiment 1

[0041] Please refer to figure 2 , which is a schematic structural diagram of a pixel circuit according to Embodiment 1 of the present invention. Such as figure 2 As shown, the pixel circuit 20 includes: a first thin film transistor T1 connected between the data line Data and the first node N1, the gate of which is connected to the first scan line Sn-1; a second thin film transistor T2 connected to Between the third power supply and the second node N2, its gate is connected to the first scanning line Sn-1; the third thin film transistor T3 is connected between the first node N1 and the third node N3, and its gate is connected to the emitter Control line Em; the fourth thin film transistor T4, connected between the first power supply and the fourth node N4, and its gate connected to the third node N3; the fifth thin film transistor T5, connected between the third node N3 and the fourth node N4 Between, its gate is connected to the second scanning line Sn; the sixth thin film...

Embodiment 2

[0073] Please refer to Figure 4 , which is a circuit diagram of a pixel circuit according to Embodiment 2 of the present invention. Such as Figure 4 As shown, the pixel circuit 30 includes: a first thin film transistor T1 connected between the data line Data and the first node N1, the gate of which is connected to the first scan line Sn-1; a second thin film transistor T2 connected to Between the third power supply and the second node N2, its gate is connected to the first scanning line Sn-1; the third thin film transistor T3 is connected between the first node N1 and the third node N3, and its gate is connected to the emitter Control line Em; the fourth thin film transistor T4, connected between the first power supply and the fourth node N4, and its gate connected to the third node N3; the fifth thin film transistor T5, connected between the third node N3 and the fourth node N4 Between, its gate is connected to the second scanning line Sn; the sixth thin film transistor T...

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Abstract

The invention provides a pixel circuit, a driving method thereof and an active matrix OLED (organic lighting emitting diode). Electric current output by a fourth thin film transistor taken as a driving element in the pixel circuit is determined by data voltage provided by a data line and initialized voltage provided by a third power supply and is not relevant to external power voltage and threshold voltage of the fourth thin film transistor, so that uneven brightness caused by threshold voltage deviation and IR voltage drop change can be avoided, compensation for IR voltage drop can be realized even though the display frame is converted to high gray scale from low gray scale, and accordingly, the active matrix OLED adopting the pixel circuit and the driving method of the pixel circuit can display images with even brightness.

Description

technical field [0001] The invention relates to the technical field of flat panel display, in particular to a pixel circuit, a driving method thereof, and an active matrix organic light emitting display. Background technique [0002] An organic light-emitting display uses an organic light-emitting diode (English full name Organic Lighting Emitting Diode, referred to as OLED) to display images. It is an active light-emitting display. TFT-LCD) has different display methods, no backlight is required, and it has many advantages such as high contrast, fast response, and thinness. Therefore, the organic light emitting display is hailed as a new generation of display that can replace the thin film transistor liquid crystal display. [0003] According to different driving methods, organic light-emitting displays are divided into passive matrix organic light-emitting displays (English full name Passive Matrix Organic Lighting Emitting Display, referred to as PMOLED) and active matri...

Claims

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Application Information

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IPC IPC(8): G09G3/32G09G3/3258
Inventor 张九占
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD
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