Design and Implementation of Readout Circuit on Glass Substrate for Touch Panel Applications

被引：4
|
作者：
Wang, Tzu-Ming [1 ]
Ker, Ming-Dou [1 ,2 ]
机构：
[1] Natl Chiao Tung Univ, Nanoelect & Gigascale Syst Lab, Inst Elect, Hsinchu 30010, Taiwan
[2] I Shou Univ, Dept Elect Engn, Kaohsuing Cty 840, Japan
来源：
JOURNAL OF DISPLAY TECHNOLOGY | 2010年 / 6卷 / 08期
关键词：
Low temperature poly-silicon (LTPS); readout circuit; system-on-panel (SOP); touch panel; OUTPUT BUFFER; COMPENSATION;
D O I：
10.1109/JDT.2010.2050577
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A readout circuit on glass substrate for touch panel application has been designed and fabricated in a 3-mu m low temperature poly-silicon (LTPS) technology. In this work, the switch-capacitor (SC) technique is applied to amplify the small voltage difference from capacitance change due to the touch event on panel. In addition, the corrected double-sampling (CDS) technique is also employed to reduce the offset originated from LTPS process variation. The minimum detectable voltage difference of the proposed circuit is 40 mV. To further identify the different touch area during touch events, a 4-bit analog-to-digital converter is used to converter the output of readout circuit into 4-bit digital codes.
引用
收藏
页码：290 / 297
页数：8
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