Touch screen with light-enhancing layer

Details Touch screen with light-enhancing layer Touch screen with light-enhancing layer

2008-07-01

2008-07-01

Monbleau, Davienne (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S222100, C250S227140, C385S012000, C385S013000, C345S173000, C345S175000, C345S176000

Reexamination Certificate

active

11484908

ABSTRACT:
A touch indication device comprises a light guide structure for passing light of a light source via total internal reflection. A touch surface disturbs the total internal reflection when touched, causing light to leave the light guide structure. A light enhancement layer converts the light leaving the light guide and sends the converted light to a light detector. The light enhancement layer amplifies the intensity and/or changes the color of the light leaving the light guide. The detector determines the position of the touch on the touch surface based on the light from the light enhancement layer.

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patent: 2007/0125937 (2007-06-01), Eliasson et al.
patent: WO 2005/029394 (2005-03-01), None

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