Liquid crystal cells – elements and systems – Liquid crystal system – Liquid crystal writing tablet
Reexamination Certificate
2006-09-05
2010-11-30
Nelms, David (Department: 2871)
Liquid crystal cells, elements and systems
Liquid crystal system
Liquid crystal writing tablet
C345S173000, C345S175000, C178S018090, C178S018110
Reexamination Certificate
active
07843516
ABSTRACT:
A liquid crystal display (LCD) device (100) having an integrated touchscreen, includes a touchscreen surface and LC layer (20) that are partitioned according to the touchscreen keys (200). A corresponding probe light source (82) and sensor (92) positioned behind each partition is assigned to the corresponding touchscreen key. Each probe light sensor is configured to detect user contact on the touchscreen surface by sensing a reflection of the probe light. To further distinguish between different keys, each key may be made active according to a scanning or timesharing process. In this process, when a particular key is active, the neighboring keys are inactive. The scanning/timesharing process may be performed during a touchscreen mode of operation, which is interleaved with a normal display mode.
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Honeywell International , Inc.
Ingrassia Fisher & Lorenz P.C.
Merlin Jessica M
Nelms David
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