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A pixel circuit, its driving method, and an organic light-emitting display device

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

Active Publication Date: 2017-10-13
CHENGDU VISTAR OPTEOLECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A pixel circuit, its driving method, and an organic light-emitting display device
  • A pixel circuit, its driving method, and an organic light-emitting display device
  • A pixel circuit, its driving method, and an organic light-emitting display device

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Embodiment 1

[0051] This embodiment provides a pixel circuit and its driving method, such as Image 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] like figure 2 As shown, each pixel circuit further includes a first power supply VDD and a second power supply VSS connected e...

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] like 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 VSS a...

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Abstract

In the pixel circuit and its driving method and organic light emitting display device according to the present invention, due to the influence of the parasitic capacitance of the organic light emitting diode itself, after each frame ends, the electricity stored in the capacitance of the organic light emitting diode itself is released, and the current flows through the organic light emitting diode. During the diode period, there is a phenomenon of light emission, which causes afterimages to appear in the organic light-emitting display device. The pixel circuit has a reverse initialization transistor (seventh transistor) for reverse initialization of the anode of the organic light emitting diode, thereby effectively solving the image sticking problem of the organic light emitting display device. In the active matrix organic light-emitting display device of the present invention, when the pixel circuit responds to a data signal, it can display that the organic light-emitting diode is reversely initialized once for each frame time, which effectively solves the problem of organic light-emitting diode parasitic The image sticking problem caused by capacitance effectively improves the display quality of the organic light emitting display device.

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