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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Jae Hyuk Jang Minho Kwon Tjandranegara, E. Kywro Lee Byunghoo Jung |
| Copyright Year | 2009 |
| Description | Author affiliation: Purdue University, West Lafayette, IN, USA (Jae Hyuk Jang; Minho Kwon; Tjandranegara, E.; Byunghoo Jung) || LG Electronics, Seoul, Korea (Kywro Lee) |
| Abstract | Active-matrix organic LED (AMOLED) is one of the most promising contenders for next-generation displays. However, the V-shift issue in thin-film transistors (TFT) has to be addressed to enable wide deployment [1]. Voltage programming and current programming are well-known V-shift-compensation techniques for analog driving. However, they all need more than 4 TFTs per pixel, which increases the panel complexity and decreases yield and aperture ratio. Recently, a V-shift compensation technique that uses a 2TFT-1C pixel in an analog driving AMOLED has been reported [2]. However, it requires OLED supply voltage programming, and shows a 14% variation in OLED current after V-shift compensation, which is not enough for high-definition applications. Digital driving has been proposed as an alternative to mitigate the V-shift issue with a simple pixel structure and to provide flexibility to the driver design. Figure 15.4.1 shows the pixel structures for voltage programming, current programming and digital driving. While the gate of the driving TFT (M2) is in the high state, the voltage across M2 is very small due to the large current-driving capability of a TFT as compared with an OLED. Hence, the current through the OLED is dominated by the supply voltage (PVDD), and minimally affected by the variations in TFT characteristics [3]. Digital driving is also useful for true dark-level expression since the OLED can be completely turned off for black gray levels. |
| File Size | 1868068 |
| File Format | |
| ISBN | 9781424434589 |
| DOI | 10.1109/ISSCC.2009.4977412 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2009-02-08 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Active matrix organic light emitting diodes Digital modulation Driver circuits Flat panel displays Humans Visual system Pulse width modulation Energy consumption Thin film transistors Noise shaping |
| Content Type | Text |
| Resource Type | Article |
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