Touch sensor array systems and display systems incorporating such
First Claim
1. A touch sensor array system including an array of sensing elements arranged according to rows and columns, and addressing means comprising row and column conductors for selectively addressing a particular one of said sensing elements at an intersection of a selected row conductor and a selected column conductor, characterised in that:
- each sensing element comprises an electronic bistable circuit at the sensing element'"'"'s location in the array, said bistable circuit being responsive to a presence or absence of a touch input at the location of the sensing element so as to adopt a first or a second stable state, respectively, that remains continuously addressable, and which upon addressing by said addressing means provides an output in accordance with its actual state, said system further comprising reset means for periodically resetting said bistable circuits of said sensing elements.
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Accused Products
Abstract
A touch sensor array system includes a row and column array of individual sensing elements each of which has a bistable circuit arranged to adopt one of the other of its two stable state in dependence upon whether or not a touch input, by e.g. a stylus or finger, exists at the sensing element location. The rows of sensing elements are periodically reset in sequence by a scanning address circuit and the states of their bistable circuits are determined at regular intervals related to resetting by a detection circuit using active matrix addressing of the sensing elements. Each sensing element includes a switching device. The array of sensing elements is fabricated using thin film, e.g. TFT, technology so that high resolution is possible. The system can be used as an overlay to a display device, e.g. a matrix liquid crystal display device.
342 Citations
20 Claims
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1. A touch sensor array system including an array of sensing elements arranged according to rows and columns, and addressing means comprising row and column conductors for selectively addressing a particular one of said sensing elements at an intersection of a selected row conductor and a selected column conductor, characterised in that:
each sensing element comprises an electronic bistable circuit at the sensing element'"'"'s location in the array, said bistable circuit being responsive to a presence or absence of a touch input at the location of the sensing element so as to adopt a first or a second stable state, respectively, that remains continuously addressable, and which upon addressing by said addressing means provides an output in accordance with its actual state, said system further comprising reset means for periodically resetting said bistable circuits of said sensing elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification