Design and implementation of readout circuit on glass substrate with digital correction for touch-panel applications

被引：0
|
作者：
Wang, Tzu-Ming [1 ]
Ker, Ming-Dou [2 ,3 ]
机构：
[1] Natl Chiao Tung Univ, Inst Elect, Nanoelect & Gigascale Syst Lab, Hsinchu 300, Taiwan
[2] I Shou Univ, Dept Elect Engn, Kaohsiung, Taiwan
[3] Natl Chiao Tung Univ, Dept Elect Engn, Hsinchu 300, Taiwan
来源：
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY | 2011年 / 19卷 / 07期
关键词：
Readout circuit; low-temperature polysilicon ( LTPS); system-on-panel (SOP); touch panel; digital correction;
D O I：
10.1889/JSID19.7.463
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 with digital correction, which contains a transconductance amplifier, counter, and digital correction circuit, has been designed for touch-panel applications for 3-mu m low-temperature polysilicon (LTPS) technology. The voltage difference as a result of a change in capacitance due to a touch event is converted to current by a transconductance amplifier. By charging and discharging the capacitor in the counter, the counter displays different digital-output codes according to touch or non-touch events. Furthermore, not only can the touch or non-touch event be distinguished, but also the influence of LTPS process variation can be compensated by a digital correction circuit in the proposed readout circuit.
引用
收藏
页码：463 / 470
页数：8
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