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Pixel driving circuit

A pixel driving circuit and pixel technology, applied in instruments, static indicators, etc., can solve the problems of compressing OLED area, affecting service life, and occupying a large number of pixel areas, so as to save layout space, increase service life, and improve opening rate effect

Inactive Publication Date: 2013-06-12
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the panel resolution increases day by day, the layout space of AMOLED will occupy a large amount of pixel area due to the need of compensation circuit, which will not only compress the provided OLED area, but also affect the service life

Method used

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Embodiment Construction

[0036] In order to make the technical content disclosed in this application more detailed and complete, reference may be made to the drawings and the following various specific embodiments of the present invention, and the same symbols in the drawings represent the same or similar components. However, those skilled in the art should understand that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are only for schematic illustration and are not drawn according to their original scale.

[0037] The specific implementation manners of various aspects of the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] figure 1 A schematic diagram showing the principle of a pixel driving circuit using a "4T2C" architecture in the prior art, figure 2 show figure 1 Schematic diagram of the timing of the key signals of the pixel driving circuit.

[0039] refer to...

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Abstract

The invention provides a pixel driving circuit. The pixel driving circuit comprises a first switch, a second switch, a third switch, a fourth switch, a first capacitor, a second capacitor and an organic light-emitting diode, wherein a first end of the first switch receives reference voltage or data voltage; a second end of the first switch receives a first switch signal; a first end of the second switch receives reset voltage; a second end of the second switch is electrically connected with a third end of the second switch; a first end of the third switch receives first voltage; a second end of the third switch receives a third switch signal; a first end of the fourth switch is electrically coupled to the third end of the third switch; a second end of the fourth switch is electrically coupled to the third end of the first switch; a first end of the second capacitor is coupled to a first end of the third switch; and a second end of the second capacitor is coupled to the third end of the fourth switch. According to the pixel driving circuit, the source electrode of the second switch is reset by the method similar to the connecting method of a diode, so that the layout space occupied for maintaining voltage routing in the current design can be eliminated, the aperture opening ratio of an OLED (Organic Light Emitting Diode) is improved, and the service life of the OLED is prolonged.

Description

technical field [0001] The present invention relates to an active matrix organic light emitting diode (AMOLED, Active Matrix Organic Light Emitting Diode) display, in particular to a pixel driving circuit of the AMOLED display. Background technique [0002] Organic light emitting diodes (Organic Light Emitting Diode, OLED) can be divided into passive matrix driving (Passive Matrix OLED, PMOLED) and active matrix driving (Active Matrix OLED, AMOLED) according to the driving method. Among them, the PMOLED does not emit light when data is not written, but only emits light during data writing. This driving method is simple in structure, low in cost, and easy to design, and is mainly suitable for small and medium-sized displays. [0003] The biggest difference between AMOLED and PMOLED is that each pixel has a capacitor to store data, so that each pixel can maintain a light-emitting state. Since the power consumption of AMOLED is significantly lower than that of PMOLED, and its...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/32G09G3/3225
CPCG09G3/3233G09G2300/0465G09G2300/0819G09G2300/0852G09G2300/0861G09G2320/045
Inventor 许文曲
Owner AU OPTRONICS CORP
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