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In-cell adaptive touch technology for a flexible e-paper display
Authors:Jong-Kwon Lee  Sang-Soo Kim  Yong-In Park  Chang-Dong Kim  Yong-Kee Hwang
Affiliation:a R&D Center, LG Display Co. Ltd., Paju-shi, Gyeonggi-do 413-811, Republic of Korea
Abstract:In-cell adaptive touch technology for use in an electrophoretic display (EPD) has been developed and implemented in 11.5 in. UXGA flexible electronic paper display. Here, two types of a-Si:H photo-sensor arrays fabricated on a stainless steel substrate at the process temperature of 250 °C have been used along with an overall capacitive sensor formed on top of the flexible panel. Thus, we can resolve the sensing issue of normal photo-sensor array as well as maintain the feature of low power consumption in the EPD. Moreover, new touch algorithm adapted depending upon the amount of light intensity has been applied to enhance touch sensitivity regardless of environmental light conditions.
Keywords:Adaptive touch  Electrophoresis  Flexible structure  Thin film transistor
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