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

The present invention provides a pixel structure of an active matrix organic light-emitting diode (AMOLED) with improved pixel aperture ratio and sufficient luminance brightness. The pixel structure includes an OLED, a data line, at least one scan line, at least one switch TFT, at least one driving TFT, and at least one storage capacitor. The first transparent electrode of the storage capacitor is made of a transparent semiconductor layer, while the second transparent electrode is made of a transparent metal layer. The method for fabricating the AMOLED pixel includes forming a transparent semiconductor layer on a substrate, patterning the semiconductor layer to form a first channel layer, a lower electrode of a storage capacitor, and a second channel layer of a driving TFT, sequentially adding a first dielectric layer, a second gate dielectric layer, and a second opaque metal gate on the substrate, and forming a data line and an OLED over the substrate. The technical effects of the invention include improved pixel aperture ratio and sufficient luminance brightness.

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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