LIGHT-BASED TOUCH SCREEN USING ELONGATED LIGHT GUIDES
First Claim
1. A touch screen comprising:
- a housing;
a display mounted in said housing;
a plurality of collimating lenses mounted in said housing and arranged along a first edge of said display;
a plurality of light pulse emitters mounted in said housing that are spaced apart from and serially transmit light pulses through said collimating lenses over said display;
a light guide mounted in said housing along the edge of said display opposite the first edge, for receiving the light pulses, the light guide comprising a reflective strip that reflects light pulses to one end of the light guide;
a light pulse receiver mounted in said housing near the one end of said light guide, for receiving the reflected light pulses; and
a calculating unit, mounted in said housing and connected to said receiver, for determining a location of a pointer on said display that partially blocks light pulses transmitted by said emitters, based on outputs of said receiver.
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Accused Products
Abstract
A touch screen including a housing, a display mounted in the housing, a plurality of collimating lenses mounted in the housing and arranged along a first edge of the display, a plurality of light pulse emitters mounted in the housing that are spaced apart from and serially transmit light pulses through the collimating lenses over the display, a light guide mounted in the housing along the edge of the display opposite the first edge, for receiving the light pulses, the light guide including a reflective strip that reflects light pulses to one end of the light guide, a light pulse receiver mounted in the housing near the one end of the light guide, for receiving the reflected light pulses, and a calculating unit, mounted in the housing and connected to the receiver, for determining a location of a pointer on the display that partially blocks light pulses transmitted by the emitters, based on outputs of the receiver.
166 Citations
15 Claims
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1. A touch screen comprising:
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a housing; a display mounted in said housing; a plurality of collimating lenses mounted in said housing and arranged along a first edge of said display; a plurality of light pulse emitters mounted in said housing that are spaced apart from and serially transmit light pulses through said collimating lenses over said display; a light guide mounted in said housing along the edge of said display opposite the first edge, for receiving the light pulses, the light guide comprising a reflective strip that reflects light pulses to one end of the light guide; a light pulse receiver mounted in said housing near the one end of said light guide, for receiving the reflected light pulses; and a calculating unit, mounted in said housing and connected to said receiver, for determining a location of a pointer on said display that partially blocks light pulses transmitted by said emitters, based on outputs of said receiver. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch screen comprising:
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a housing; a display mounted in said housing; a light guide mounted in said housing along a first edge of said display, the light guide comprising a reflective strip that reflects light pulses received at one end of the light guide; a light pulse emitter mounted in said housing near the one end of said light guide, for transmitting light pulses through said light guide, wherein said reflective strip reflects the light pulses over said display; a plurality of collimating lenses mounted in said housing along the edge of said display opposite the first edge; a plurality of light pulse receivers mounted in said housing that are spaced apart from and receive light pulses through said collimating lenses; and a calculating unit, mounted in said housing and connected to said receivers, for determining a location of a pointer on said display that partially blocks the light pulses transmitted by said emitter, based on outputs of said receivers.
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8. A touch screen comprising:
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a housing; a display mounted in said housing; a light guide mounted in said housing along a first edge of said display, the light guide comprising a reflective strip that reflects light pulses received at either end of the light guide; a plurality of light pulse emitters mounted in said housing near each end of said light guide, for transmitting light pulses through said light guide, wherein said reflective strip reflects the light pulses over said display; a plurality of collimating lenses mounted in said housing along the edge of said display opposite the first edge; a plurality of light pulse receivers mounted in said housing that are spaced apart from and receive light pulses through said collimating lenses; and a calculating unit, mounted in said housing and connected to said receivers, for determining a location of a pointer on said display that partially blocks the light pulses transmitted by said emitters, based on outputs of said receivers. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification