Multi-touch sensing light emitting diode display and method...

Details Multi-touch sensing light emitting diode display and method... Multi-touch sensing light emitting diode display and method...

2005-10-24

2009-10-06

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S173000, C345S174000, C345S175000, C345S176000

Reexamination Certificate

active

07598949

ABSTRACT:
Apparatus and method for both displaying graphical output and for sensing, e.g., multi-touch input are provided. A light-emitting diode (“LED”) matrix-array may be configured to both emit and sense light. The array may be driven in such a way so as to enable the array itself to act as the illumination source preferable for either reflective or scattering optical touch sensing. The need for additional opto-electronic components, or an external illumination source, is thus eliminated or at least reduced, and sensing accuracy is likely improved. Additionally, the method is practical for large dimensions.

REFERENCES:
patent: 3621268 (1971-11-01), Friedrich
patent: 4424524 (1984-01-01), Daniele
patent: 4692739 (1987-09-01), Dorn
patent: 5424855 (1995-06-01), Nakamura
patent: 6787810 (2004-09-01), Choi et al.
patent: 7042444 (2006-05-01), Cok

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