用於次世代顯示器驅動電路與觸控偵測電路之設計

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研究生：	賴李沛毅 Lai Lee, Pei-Yi
論文名稱：	用於次世代顯示器驅動電路與觸控偵測電路之設計 Design for Next-Generation Display Driver Circuit and Touch Sensing Circuit
指導教授：	張慶元 Chang, Tsin-Yuan 盧志文 Lu, Chih-Wen
口試委員:	劉柏村 Liu, Po-Tsun 蘇國棟 Su, Guo-Dung 黃柏鈞 Huang, Po-Chiun 劉怡君 Liu, Jenny Yi-Chun
學位類別：	博士 Doctor
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2020
畢業學年度：	108
語文別：	英文
論文頁數：	127
中文關鍵詞：	觸控面板控制器、電場、內建數位類比轉換器之運算放大器、數位類比轉換器、液晶顯示器之源驅動器、基於互補式金氧半導體基底之微型發光二極體顯示器、微型顯示器
外文關鍵詞：	Touch panel controller (TPC), Electric field, DAC embedded op-amp, digital-to-analog converter (DAC), liquid-crystal display (LCD) column driver, Micro LED on CMOS, micro display
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本論文中首先介紹觸摸技術和顯示技術，其二是人們與數位裝置之常見輸入和輸出介面。在本文的第一部分，我們提出了一種新的觸摸檢測機制來實現觸摸功能。藉由生活環境中電力線所散逸出訊號，其耦合至人體來當作觸控訊號來源，由本電路不需要一般傳統電容式觸控之發送電路。所提出的傳感技術可以通過手指觸摸實現46.5 dB的信噪比。在電池電源為1.8V和2.5V的情況下，此讀出電路總功耗為2 mW。
第二部分是提出一種具有高線性度和高面積效率的高分辨率薄膜電晶體面板驅動器電路。具有部分分段的分段線性數位類比轉換器的10位元單色色階，1026通道列驅動器電路的設計。本電路採用新邏輯組合控制之類比數位轉換器，藉此可以有效的減小數位類比轉換器電晶體個數進而達到面積縮小。於輸出緩衝電路具備內建解碼器與內插功能，為解決於多內差位元與大的內差電壓範圍造成之線性度問題，輸出緩衝電路中採用新的輸入對架構，此方式可以有效地增進電壓內插之線性度。本晶片採用台積電0.18μm工藝，1.8V/9V/18V高壓製程製作。在伽瑪曲線的高亮度部分測得的最大擬合誤差為8.2 mV。在10mV的容差範圍內驅動5kΩ電阻和300pF電容的最大建立時間為5.6 μs。沒有失調消除，最大晶片間DVO為16 mV。
第三部分介紹了下一代基於CMOS的Micro LED顯示技術的驅動電路，來實現微型化高解析度螢幕，此技術可以用於虛擬實境的應用中。首先我們提出一個32 × 30 Mini LED，此Mini LED是基於印刷電路板上，用於此面板之驅動電路可以達每秒160幀，PWM的電壓驅動方式可以到10位元的單色色深。此驅動電路之線性度表現上可以達到INL=0.077LSB與DNL=0.08LSB。藉由32 × 30 Mini LED驅動電路再提出基於CMOS的Micro LED分辨率為250 × 250的單尺寸顯示驅動器電路和每秒60幀的基於矽的Micro LED驅動器。在該項目中，採用台積電0.35μm工藝和12.8μm寬像素設計來實現近2000PPI的視覺高分辨率，採用共陰極的連接Micro LED面板，並通過PWM調變與電壓驅動來實現10位色深

In the past ten years, due to the rapid development of semiconductor technology, fast and powerful hardware platforms have provided a proper platform for application software to perform. The combination of hardware and software has created many practical and interesting high-tech products in our lives. We reliance and demand for these high-tech products are also increasing. The development of the input and output interface of human and computer opinion has been the focus of development in recent years.
In the first part of this paper, we proposed a new touch detection mechanism to achieve the touch function. The proposed sensing technique achieves 46.5-dB signal-to-noise ratios with finger touch. With battery power supply of 1.8V and 2.5V, total power consumption of the proposed readout circuit is measured as just 2mW.
The second part is to propose a high-resolution TFT panel driver circuit with high linearity and high area efficiency. The design of a 10-bit 1026-channel column driver IC with partially segmented piecewise linear DACs. The maximal fitting error of 8.2 mV was measured in the high-luminance segment of the gamma curve. The maximum settling time for driving a 5-kΩ-resistance and 300-pF-capacitance load within 10-mV tolerance is 5.6 μs. With no offset cancellation, the maximum inter-chip DVO is 16 mV.
The third part introduces the driving circuit for the next-generation Micro LED display technology. First, we proposed a driver for 32 × 30 Mini LED panel. This Mini LED is based on a printed circuit board. The driving circuit used for this panel can reach 160 frames per second. The PWM voltage driving method can reach a 10-bit single color depth. The linearity performance of this driving circuit can reach INL = 0.077LSB and DNL = 0.08LSB. Through the 32 × 30 Mini LED on PCB driver circuit, a compact Micro LED on CMOS display driver circuit with a resolution of 250 × 250 is proposed, and this Micro LED on CMOS driver can work at 60 frames per second. In this work, the TSMC 0.35μm process and the 12.8μm wide pixel design are used to achieve a high resolution of nearly 2000 PPI for VR/AR usage, and a 10-bit color depth is achieved by PWM modulation.

ABSTRACT------------------------------------------------------------------------------- III
CONTENTS------------------------------------------------------------------------------- VII
LIST OF FIGURES------------------------------------------------------------------------  XI
LIST OF TABLES-------------------------------------------------------------------------XVII
Chapter 1
Introduction------------------------------------------------------------------------------1
1    Background and Motivation---------------------------------------------------------2
2    Thesis Organization---------------------------------------------------------------6
Chapter 2    Overview of Touch Sensing Circuitry and Display Driver Circuitry----------7
1    Introduction----------------------------------------------------------------------7
2    Touch Sensing Circuit-------------------------------------------------------------7
2.1    Resistive Touch Sensing Circuit---------------------------------------------------9
2.2    Capacitive Touch Sensing Circuit-------------------------------------------------10
3    Flat Display Technology----------------------------------------------------------15
3.1    Thin Film Transistor Liquid Crystal----------------------------------------------15
3.2    Gamma Correction for TFT-LCD-----------------------------------------------------24
3.3    LCD Control Module---------------------------------------------------------------25
4    Self-emission Display Panel------------------------------------------------------30
4.1    OLED Display Panel---------------------------------------------------------------31
4.2    LED Display Panel----------------------------------------------------------------32
4.3    Mini/Micro Display Technology----------------------------------------------------32
5    Summary--------------------------------------------------------------------------35
Chapter 3    Electric Hum Signal Readout Circuit for Touch Screen Panel Applications--36
1    Introduction---------------------------------------------------------------------36
2    Architecture---------------------------------------------------------------------38
2.1    Interface Circuitry--------------------------------------------------------------42
2.2    10-bit Low-Power SAR-ADC---------------------------------------------------------48
3    Measurement Results--------------------------------------------------------------50
4    Summary--------------------------------------------------------------------------54
Chapter 4    The Design of a 10-bit Source Driver with High Linearity Mechanism and High Efficiency of Layout Area Technique--------------------------------------------------------------------55
1    Introduction---------------------------------------------------------------------55
2    Proposed Circuit Technique-------------------------------------------------------59
2.1    Architecture of Proposed Column Driver-------------------------------------------60
2.2    Two-Voltage Selector-------------------------------------------------------------61
2.3    Logic-Embedded Level Shifter-----------------------------------------------------63
2.4    DAC-Embedded Op-Amp with Gm-Modulation-------------------------------------------73
3    Measurement Results--------------------------------------------------------------83
4    Summary--------------------------------------------------------------------------90
Chapter 5    The Design of High-Resolution Driver Circuit for Micro LED on CMOS-------91
1    Introduction---------------------------------------------------------------------91
2    Driver for Micro LED on CMOS-----------------------------------------------------92
2.1    Architecture---------------------------------------------------------------------93
2.2    Connection between Micro LED and CMOS substrate----------------------------------94
3    The Implementation of Driving for Micro LED--------------------------------------97
3.1    A 32×30 mini LED Array on PCB Panel----------------------------------------------97
3.2    Voltage Driving Implementation---------------------------------------------------99
3.3    Current Driving Implementation--------------------------------------------------103
4    Measurement Results-------------------------------------------------------------105
4.1    Driver circuit for Passive-Matrix Mini LED Displays-----------------------------105
4.2    Driver circuit for Micro LED on CMOS Displays-----------------------------------109
5    Summary-------------------------------------------------------------------------114
Chapter 6    Conclusions-------------------------------------------------------------115
1    Summary-------------------------------------------------------------------------115
2    Future Works--------------------------------------------------------------------116
BIBLIOGRAPHY----------------------------------------------------------------------------117

                                

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