Optically-based touch screen input device
First Claim
1. An input device comprising:
- an overlay for a display screen comprising an optically conductive material, the overlay having a central region for transmitting first electromagnetic radiation corresponding to an object in contact with the overlay at a first location, and a light conduit along the edge of and integrally formed with the central region for receiving and transmitting the first electromagnetic radiation, the light conduit being configured to inhibit transmission of the first electromagnetic radiation back into the central region of the overlay;
at least one detector coupled to the light conduit for receiving the first electromagnetic radiation and generating a signal indicative thereof; and
location circuitry for receiving the signal and generating location data indicative of the first location.
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Abstract
An input device comprising an overlay for a display screen comprising an optically conductive material is described. The overlay has a central region for transmitting first electromagnetic radiation corresponding to an object in contact with the overlay at a first location, and a light conduit along the edge of the central region for receiving and transmitting the first electromagnetic radiation. The light conduit is configured to inhibit transmission of the first electromagnetic radiation back into the central region of the overlay. At least one detector is coupled to the light conduit for receiving the first electromagnetic radiation and generating a signal indicative thereof. Location circuitry receives the signal and generates location data indicative of the first location.
162 Citations
23 Claims
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1. An input device comprising:
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an overlay for a display screen comprising an optically conductive material, the overlay having a central region for transmitting first electromagnetic radiation corresponding to an object in contact with the overlay at a first location, and a light conduit along the edge of and integrally formed with the central region for receiving and transmitting the first electromagnetic radiation, the light conduit being configured to inhibit transmission of the first electromagnetic radiation back into the central region of the overlay;
at least one detector coupled to the light conduit for receiving the first electromagnetic radiation and generating a signal indicative thereof; and
location circuitry for receiving the signal and generating location data indicative of the first location. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An input device for a system having a display screen comprising:
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an overlay for the display screen comprising an optically conductive material, the overlay having a central region for transmitting first electromagnetic radiation corresponding to an object in contact with the overlay at a first location, and a light conduit along the edge of and integrally formed with the central region for receiving and transmitting the first electromagnetic radiation, the thickness of the central region being controlled to inhibit second electromagnetic radiation corresponding to parasitic reflections from reaching the light conduit, the light conduit having a cross-section which is larger than the thickness of the central region adjacent the light conduit;
at least one detector coupled to the light conduit for receiving the first electromagnetic radiation and generating a signal indicative thereof; and
circuitry for receiving the signal and generating data indicative of the first location.
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- 18. An overlay for a display screen composing an optically conductive material, the overlay having a central region for transmitting first electromagnetic radiation corresponding to an object in contact with the overlay at a first location, and a light conduit along the edge of and integrally formed with the central region for receiving and transmitting the first electromagnetic radiation, the light conduit being configured to inhibit transmission of the first electromagnetic radiation back into the central region of the overlay.
Specification