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Pixel driving circuit of light-emitting diode

A technology of pixel drive circuit and light-emitting diode, which is applied in the direction of lamp circuit layout, light source, electric light source, etc., and can solve the problems of uneven pixel brightness, complicated implementation, and uneven brightness of panels

Inactive Publication Date: 2010-06-09
TPO DISPLAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the structure of 2T1C is simple, it has the problem of uneven brightness of the panel
The applicant's U.S. Patent Application No. 2006 / 0023551 also mentioned the same problem, but still uses voltage compensation to solve it, which is more complicated to implement and requires too many transistors
[0004] Therefore, it is necessary to provide a new pixel driving circuit for light-emitting diodes, which uses a simple, easy-to-implement and energy-saving method to solve the problem of uneven brightness of pixels

Method used

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  • Pixel driving circuit of light-emitting diode
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  • Pixel driving circuit of light-emitting diode

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Embodiment Construction

[0013] figure 2 An electronic device 10 according to an embodiment of the invention is shown. Those skilled in the art should know that the electronic device 10 may include, but is not limited to, mobile phones, digital cameras, personal digital assistants, notebook computers, desktop computers, televisions, global positioning systems, car displays, aviation displays, Digital photo frame or portable DVD player, etc. In this embodiment, the electronic device 10 may include an active organic light emitting diode (AMOLED) display 20 and a controller 25, a display panel 21 on the display 20, and an active display area 22 on the display panel 21, and a pixel array. 23 is located in the effective display area 22 and contains a plurality of data lines and scanning lines, and the controller 25 is used to control the operation of multiple pixel driving circuits in the pixel array 23 to display images, and the details will be described later. It is worth mentioning that the drawings ...

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Abstract

A pixel driving circuit of a light-emitting diode (LED) comprises a storage capacitor, a first commutation circuit and a driving element, wherein the storage capacitor comprises a first node and a second node; the second node receives signal voltage in a first period and the first node receives reference voltage during a second period of the first period; the first commutation circuit isolates the first node and a fixed voltage source in the first period and conducts the first node and the fixed voltage source after the first period to provide fixed voltage for the first node; and the driving element outputs drive current which is not related to the fixed voltage after the first period.

Description

technical field [0001] The present invention relates to a pixel driving circuit, in particular to a pixel driving circuit of an organic light emitting diode, more particularly to a driving circuit of an active organic light emitting diode (AMOLED). Background technique [0002] Active organic light-emitting diode technology has always been regarded as one of the most forward-looking display technologies. Due to the characteristics of active organic light-emitting diodes, such as thinness, high color saturation, self-illumination, fast response time, high contrast ratio and flexibility, etc., Therefore, it is considered possible to become the mainstream of next-generation display technology. [0003] figure 1 It shows a known “2T1C” pixel driving circuit of an OLED, that is, only two TFTs M1 and M2 and one capacitor Cst are used to drive each pixel. Although the structure of 2T1C is simple, it has the problem of uneven brightness of the panel. In addition to changes in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02G09G3/32G09F9/33G09G3/3233
Inventor 曾章和
Owner TPO DISPLAY
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