Abstract
We report the effects of monochromatic illumination on
the electrical performance of a-SiGe:H thin-film transistor (TFT) and the
use of this device as infrared (IR) image-sensing touch displays. In order
to reduce the inevitable incidence of visible light into device, the visible
cutting layer was designed, which played a critical role in reducing the optical
noise from visible light. When the photo response was observed in real liquid
crystal display (LCD) operation environment, it showed the display contents
dependence, meaning that the supply of external IR light source for the touch
sensing would be effective independent of any ambient light condition. Additionally,
the optical noise from the display operation was eliminated using the block
operation as well as the backlight IR light-emitting diode (LED) light modulation.
From these, the clear touch images were successfully obtained in the a-SiGe:H
photosensor embedded LCD panel.
© 2012 IEEE
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