05194862 is referenced by 184 patents and cites 5 patents.

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.

Title
Touch sensor array systems and display systems incorporating such
Application Number
7/713237
Publication Number
5194862
Application Date
June 7, 1991
Publication Date
March 16, 1993
Inventor
Martin J Edwards
Crawley
GB
Agent
Brian J Wieghaus
Assignee
U S Philips Corporation
NY, US
IPC
G09G 3/00
H03M 11/00
View Original Source