Touch screen
First Claim
1. A touch screen, comprising:
- a first and second substrate, said first substrate being spaced apart from said second substrate by a gap,a pair of regions formed of conductive material formed on said first and second substrates respectively, in overlapping relationship,a pair of strips formed from a resistive material coupled to opposed edges of each conductive region such that said resistance strips of said first substrate extend in a substantially perpendicular direction to said resistance strips of said second substrate,a circuit which applies a first reference voltage across the resistance strips of the first substrate, and subsequently applies a second reference voltage across the resistance strips of the second substrate, said circuit being structured and arranged to calculate an X coordinate based on a voltage drop across each resistance strip of said first substrate independent of a voltage drop across the other resistance strip of said first substrate and being structured and arranged to calculate a Y coordinate based on a voltage drop across each resistance strip of said second substrate independent of a voltage drop across the other resistance strip of said second substrate.
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Accused Products
Abstract
An touch screen of the voltage-divider type is provided which includes two substrates spaced apart from each other by a gap, each substrate including a region formed of conductive material formed in overlapping relationship to each other. A pair of strips formed from a resistive material is coupled to opposed edges of each conductive region such that the resistance strips of the first substrate extend in a substantially perpendicular direction to the resistance strips of said the second substrate. A circuit is provided which applies a first reference voltage across the resistance strips of the first substrate, and subsequently applies a second reference voltage across the resistance strips of the second substrate.
61 Citations
13 Claims
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1. A touch screen, comprising:
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a first and second substrate, said first substrate being spaced apart from said second substrate by a gap, a pair of regions formed of conductive material formed on said first and second substrates respectively, in overlapping relationship, a pair of strips formed from a resistive material coupled to opposed edges of each conductive region such that said resistance strips of said first substrate extend in a substantially perpendicular direction to said resistance strips of said second substrate, a circuit which applies a first reference voltage across the resistance strips of the first substrate, and subsequently applies a second reference voltage across the resistance strips of the second substrate, said circuit being structured and arranged to calculate an X coordinate based on a voltage drop across each resistance strip of said first substrate independent of a voltage drop across the other resistance strip of said first substrate and being structured and arranged to calculate a Y coordinate based on a voltage drop across each resistance strip of said second substrate independent of a voltage drop across the other resistance strip of said second substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A touch screen, comprising:
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a first rectangular conductive region having an active area of a negligible resistance adapted to be touched and an inactive area situated on the perimeter of said active area, said first conductive region being coupled to a first pair of resistance strips, each resistance strip of said first pair being arranged along a vertical edge of said first conductive region in said inactive area, a second rectangular conductive region having an active area of a negligible resistance and an inactive area situated on the perimeter of said active area, said second conductive region situated in a plane parallel to said first conductive region, said second conductive region being coupled to a second pair of resistance strips, each resistance strip of said second pair being arranged along a horizontal edge of said second conductive region in said inactive area, and a circuit which applies a first reference voltage across said resistance strips of said first substrate, and subsequently applies a second reference voltage across said resistance strips of said second substrate, said circuit being structured and arranged to calculate an X coordinate based on a voltage drop across each resistance strip of said first substrate independent of a voltage drop across the other resistance strip of said first substrate and being structured and arranged to calculate a Y coordinate based on a voltage drop across each resistance strip of said second substrate independent of a voltage drop across the other resistance strip of said second substrate.
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Specification