Pixel structure of active matrix organic light-emitting diode and method for fabricating the same

Abstract

A pixel structure of an active matrix organic light-emitting diode (AMOLED) includes an organic light-emitting diode (OLED), a data line, at least one scan line, at least one switch thin film transistor (TFT), at least one driving TFT and at least one storage capacitor with two transparent electrodes. Since both the electrodes of the transparent storage capacitor are formed by transparent material, the aperture ratio of the pixel and the area of the capacitor largely increase and can reach 50%˜95% of a pixel area. Thus, the display quality of an AMOLED panel can be improved.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the priority benefit of Taiwan application serial no. 94147154, filed on Dec. 29, 2005. All disclosure of the Taiwan application is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of Invention [0003] The present invention relates to an organic light-emitting diode (OLED) and the method for fabricating the same, and particularly to an active matrix organic light-emitting diode (AMOLED) and the method for fabricating the same. [0004] 2. Description of the Related Art [0005] An organic light-emitting diode (OLED) is a semiconductor device capable of converting electrical energy into optical energy. Since OLEDs have advantages of high conversion efficiency, no angle of view (AOV) concern, simpler process, low cost, high response rates, broader operation temperature range and full colorization, OLEDs meet the requirements of multi-media age today and are broadly applied in indicator lights...

AI Technical Summary

Benefits of technology

[0009] The present invention is to provide a pixel structure of an active matrix organic light-emitting diode (AMOLED) and the method for fabricating the same, capable of improving the pixel aperture ratio.

[0022] Since the present invention takes two transparent electrodes to form a storage capacitor in the AMOLED pixel structure, the entire capacitor is transparent, which enables to largely increase the aperture ratio of a pixel and allows the capacitor area to be 50%˜95% of a pixel area for improving the frame quality. On the other hand, since the capacitor area in a pixel area can reach 50%˜95%, the frame quality will not be deteriorated even if the size of the pixel is shrunken. Thus, pixel size can be further minimized.

[0023] Note that the gate, the scan line and the data line of the pixel structure are made of low-resistance metal, which contributes to a shorter RC time delay. Hence, the present invention is applicable to fabricate an active matrix panel with high resolution.

Problems solved by technology

However, the luminance efficiency and the lifetime of a passive driving device are largely declined along with the increase of display size and resolution.

Thus, when a color filter is integrated into an OLED panel, the luminance brightness of the pixel array of a bottom emitting AMOLED is obviously not as good as a top emitting AMOLED.

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