Abstract
For active matrix organic light emitting diode (AMOLED), thin film transistors (TFTs) are used as driving and switching components in a pixel circuit. However, during fabricated process, the inevitable variations, such as threshold voltage variation, cause different driving currents leading to luminance non-uniformity. In addition, OLED degradation decreases the luminance over time, and excessive components in a pixel with bottom emission decrease aperture ratio.In this work, three proposed pixel circuits ameliorate the quality of display. The first pixel circuit, composed of 5T2C with top emission, can improve luminance non-uniformity and degradation. The second pixel circuit, composed of 4T1C, is the improved circuit of the first one. The third circuit is that 3T1C in the pixel with bottom emission increase aperture ratio due to the compensation functionality achieved by the external driving circuit. These circuits have contributions for AMOLED application in the future.
| Date of Award | 2008 |
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| Original language | Chinese (Traditional) |