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38.1: Embedded Liquid Crystal Capacitive Touch Screen Technology for Large Size LCD Applications
Author(s) -
Takahashi Seiki,
Lee Byoung Jun,
Koh Jai Hyun,
Saito Satoru,
You Bong Hyun,
Kim Nam Deog,
Kim Sang Soo
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256838
Subject(s) - liquid crystal display , capacitive sensing , sensitivity (control systems) , pixel , materials science , capacitance , voltage , amplifier , optoelectronics , calibration , response time , electrical engineering , electronic engineering , computer science , engineering , computer graphics (images) , cmos , artificial intelligence , electrode , physics , quantum mechanics
A new embedded touch screen panel (TSP) incorporated with liquid crystal capacitive (LCC) sensors and a‐Si:H TFT amplifiers has been developed. The size of sensor pixels and capacitance values have been optimized for improved sensitivity. The readout current from a sensor pixel is converted to readout voltage data, and a digital calibration process is conducted. A sensing voltage larger than 1V is obtained with 50gf finger touch, and a highly sensitive multi‐finger touch operation has been demonstrated with aproto‐type 16 inch qHD panel.