Pixel circuit, driving method thereof and organic light-emitting display device

A pixel circuit and organic technology, applied in the field of organic light-emitting display devices, can solve the problems of afterimage and light emission of organic light-emitting display devices, and achieve the effects of improving display quality, solving afterimage, and solving parasitic capacitance

Active Publication Date: 2015-03-25
CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] although figure 1 The traditional organic light-emitting display device described in has the advantage of low power consumption, but because the organic light-emitting diode OLED has a stacked metal electrode structure, which is equivalent to a capacitor connected in parallel with a diode, when T3 is turned off, the amount of electricity stored in the OLED's own capacitance Release, when the current passes through the OLED, there will be a phenomenon of light emission, which will cause the problem of residual image in the organic light-emitting display device

Method used

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  • Pixel circuit, driving method thereof and organic light-emitting display device
  • Pixel circuit, driving method thereof and organic light-emitting display device
  • Pixel circuit, driving method thereof and organic light-emitting display device

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Embodiment 1

[0051] This embodiment provides a pixel circuit and its driving method, such as Figure 6 As shown, the pixel circuit in the nth row and the mth column is electrically connected to the data driver 130 through the data line Dm, and is electrically connected to the scanning driver 120 through the scanning line Sni (i is 1, 2, 3, 4); each pixel unit 110 is initialized in the first stage t1 of the scanning control signal provided by the scanning line Sni, accepts the data type provided from the data line Dm in the second stage t2, and emits light having a brightness corresponding to the data signal in the third stage t3. Display images; in the third stage t3, the scan line Sni transitions to a suitable level after providing the scan control signal, so as to provide current to the organic light emitting diode OLED provided in each pixel unit 110 .

[0052] Such as figure 2 As shown, each pixel circuit further includes a first power supply VDD and a second power supply VSS connect...

Embodiment 2

[0074] This embodiment provides a pixel circuit and a driving method thereof. The pixel circuit in the nth row and the mth column is electrically connected to the data driver 130 through the data line Dm, and connected to the scan driver 130 through the scan line Sni (i is 1, 2, 4). 120 is electrically connected; each pixel unit 110 is initialized in the first stage t1 of the scanning control signal provided by the scanning line Sni, in the second stage t2 accepts the data model provided from the data line Dm, and in the third stage t3 by emitting In the third stage t3, the scanning line Sni transitions to an appropriate level after providing the scanning control signal, so as to provide current to the organic light emitting diode OLED provided in each pixel unit 110 .

[0075] Such as Figure 7 As shown, each pixel circuit further includes a first power supply VDD and a second power supply VSS connected externally, and the first power supply VDD and the second power supply VS...

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Abstract

The invention discloses a pixel circuit, a driving method of the pixel circuit and an organic light-emitting display device. Because of influences of the parasitic capacitance of an organic light-emitting diode, after each frame ends, electricity stored by the capacitance of the organic light-emitting diode is released, a light-emitting phenomenon happens when the current passes the organic light-emitting diode, and therefore a ghost shadow happens to the organic light-emitting display device. The pixel circuit is provided with a reverse initialization transistor (a seventh transistor) used for performing reverse initialization on the anode of the organic light-emitting diode, and therefore the ghost shadow problem of the organic light-emitting display device is effectively solved. According to the active matrix organic light-emitting display device, when the pixel circuit responds to a digital signal, it can be displayed that reverse initialization is performed once on the organic light-emitting diode at each frame of time, the problem that the ghost shadow happens to the parasitic capacitance of the organic light-emitting diode is effectively solved, and the display quality of the organic light-emitting display device is effectively improved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit capable of effectively improving the response characteristics of a display device and displaying uniform pixel quality, a driving method thereof, and an organic light-emitting display device using the pixel circuit. Background technique [0002] Flat panel display has the characteristics of complete planarization, lightness, thinness, and power saving. It is an inevitable trend and research focus of image display development. Among various types of flat panel display devices, since the active matrix organic light emitting display device (English full name is Active Matrix Organic Light Emitting Display, referred to as AMOLED) uses self-luminous organic light emitting diode (English full name is Organic Light Emitting Diode, referred to as OLED). ) to display images, has the characteristics of short response time, driving with low power consumption, and re...

Claims

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Application Information

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IPC IPC(8): G09G3/32H01L27/32G09G3/3225
Inventor 张婷婷朱晖张小宝
Owner CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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