Design and Implementation of Image Processing Unitsing a-Si TFT Process on Flexible Substrate
Date Issued
2008
Date
2008
Author(s)
Bai, Jiun-Ying
Abstract
Flexible electronics is the technique where circuits are designed and fabricated on a flexible substrate, for example, plastic or paper substrates. Display panel is theost important application of flexible electronics. In many panels, each pixel is drived by a thin-film-transistor(TFT), which are named as active matrix flat panel display. In fact, TFTs are also transistors, and in many panels, they are also used to implement driver circuits on the same glass substrate of pixels. When more and more circuits are designed and integrated on TFT process, a panel becomes a system, which is so-called System-on-Panel (SOP) or System on-Glass (SOG). Besides driver circuits, there are some previous works in the implementation of digital circuits by use of TFT process on the glass substrates and flexible substrates, where CG-silicon TFTs and LTPS TFT technologies are used respectively. Other than these two kinds of TFTs processes, amorphous-silicon (a-Si) TFT is widely used in many large-area electronics as well, such as liquid-crystal-display (LCD). It is worth to consider the circuit design on flexible a-Si TFT technology. In this thesis, an asynchronous FIR filter design and a multi-core image display system using a-Si TFTs process on flexible substrate are proposed. There are three major contributions in this thesis. First, the characteristic of a-Si TFTs on digital circuit design are analyzed, and some basic cell libraries have been built. Second, we also verify that asynchronous circuit design can deal with the problems dueo the flexible process variation. Finally, it is also proved that for the low mobility process, the high parallelism structure, can improve the circuit performance.ased on this concept, an image display system, which is composed of a image control unit core and several DSP cores, is developed.he proposed design techniques are verified by ITRI a-Si TFTs process and fabricated on glass substrate and plastic substrate. Implementation results show that the asynchronous FIR filter design can work correctly, and the processing speed is 500 samples/s with 10V supply voltage. Experiential results show that the multicore image display systemcan work at 1KHz and output two pixels per cycle whenxecuting simple image processing algorithms. We believe that the design experiences described in this thesis can be the base for the larger flexible electronics design in the future.
Subjects
flexible electronic
astynchronous
a-Si
multi-core
DSP
Type
thesis
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