臺灣博碩士論文加值系統

隨著製程的進步，以非晶矽薄膜電晶體主動陣列所製成的液晶顯示器由於降低了生產成本與提高了生產良率而越來越受到歡迎。為了能提供液晶顯示器驅動信號與控制訊號，整個面板系統仍然需要由互補式金氧半導體製程所製造的週邊電路。近年來，由於SOG的觀念日漸受到重視，若將顯示器所需之週邊電路用與面板元件相同的製成一同整合在同樣的玻璃基版上，高整合度的系統將可以被實現，而且也可以降低生產成本與提高可靠度。然而，也由於薄膜電晶體元件能力的不足，以非晶矽薄膜電晶體元件來設計積體電路仍然存在著一定的困難度，尤其是設計類比電路，甚至是設計混和訊號積體電路。本篇論文，為了克服薄膜電晶體元件所帶來的先天限制，提出了一個創新的架構。在第三章中，藉由增益放大的技巧，可以讓運算放大器的小訊號增益獲得及大的改善，進而促使運算放大器能夠在非晶矽薄膜電晶體製程中實現與研製。在第四章中，根據第三章所提出的運算放大器，差動差分放大器的架構將被提出，並且利用差動差分放大器來設計所需的濾波器。在第五章中，由傳統架構所改良的積體式觸碰面板系統將被提出並實現。

With the advances in the fabrication technology, the liquid-crystal display (LCD) with amorphous-silicon (a-Si) active-matrix thin-film transistors (TFTs) is the most popular one due to its unparallel advantages in fabrication cost and productivity. In order to provide the control and driving signals for the display, a CMOS chipset is generally required. Recently, the concept of a system on glass (SOG) has been proposed. As the peripheral circuits are integrated with the pixel array on the same glass substrate, a compact system with low cost and high reliability can be realized. However, limited by the characteristics of the TFT devices, it is still a challenging task for designers to implement the integrated circuits in an a-Si TFT technology, especially for analog and mixed-signal building blocks.
In this thesis, to alleviate the device limitations imposed on a-Si technologies, novel circuit topologies are developed. In Chapter 3, a gain-enhancement technique is introduced to the operational amplifier (OPAMP) while the small-signal gain can be boosted, facilitating circuit implementation in a-Si technologies. In Chapter 4, a differential-difference amplifier (DDA) and a low-pass filter (LPF) based on the proposed OPAMP are developed. In Chapter 5, a touch panel system modified by the conventional charge amplifier is presented for demonstration.

Acknowledgement v
Abstract vii
Table of Contents xi
List of Figures xv
List of Tables xix

Chapter 1 Introduction 1
1.1 Introduction to a-Si Technologies 1
1.1.1 A brief history of a-Si Technologies 1
1.1.2 Device Characteristics 4
1.2 Motivation of this Thesis 6
1.2.1 Applications of OPAMP for Panel Systems 7
1.2.2 Design Challenges of OPAMP in a-Si Technologies 8
1.3 Organization of this Thesis 10

Chapter 2 Fundamental of OPAMP 13
2.1 General Consideration of OPAMP 13
2.1.1 Open-Loop Gain of OPAMP 14
2.1.2 Small-Signal Bandwidth of OPAMP 14
2.2 Architectures of OPAMP 15
2.2.1 Two-Stage OPAMP 15
2.2.2 Gain-Boosting OPAMP 16

Chapter 3 The Proposed OPAMP in a-Si Technologies 23
3.1 The Design Procedure of Amplifier in a-Si Technologies 23
3.2 The Proposed Topology of OPAMP in a-Si Technologies 26
3.2.1 A Gain-Enhancement Technique 26
3.2.2 A Feed-Forward Technique 29
3.3 Experimental Results 31
3.4 Summary 33

Chapter 4 The Proposed Analog Filter in a-Si Technologies 37
4.1 Design Challenges of Analog Filter in a-Si Technologies 37
4.2 The Proposed Topology of Analog Filter 38
4.2.1 Differential Difference Amplifier 40
4.2.2 Unity-Gain Buffer 41
4.2.3 Passive Elements 41
4.3 Circuit Implementation 42
4.4 Experimental Results 43
4.5 Summary 45

Chapter 5 The Prototype of Touch Panel in a-Si Technologies 47
5.1 Recent Development of Touch Panel System 48
5.2 The Proposed Topology of Touch Panel 50
5.2.1 Differential Charge Amplifier 52
5.2.2 Comparator 53
5.3 Circuit Implementation 53
5.4 Simulation and Experimental Results 55
5.5 Summary 58

Chapter 6 Conclusion 61

Bibliography 65

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