See-through digitizer with clear conductive grid

Details See-through digitizer with clear conductive grid See-through digitizer with clear conductive grid

1991-10-30

1995-01-10

Weldon, Ulysses

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

178 18, G09G 300

Patent

active

053811607

ABSTRACT:
A combined display and electromagnetic digitizing input device for pen-driven computers. There is a graphics display panel having a viewing surface and a back surface. A first grid of parallel transparent conductors for connection to electromagnetic digitizing electronics to sense the location of an electromagnetic stylus is disposed over one of the surfaces. A second grid of parallel transparent conductors for connection to the electromagnetic digitizing electronics is disposed over the first grid of parallel transparent conductors electrically insulated therefrom and perpendicular thereto. The two grids are constructed of flexible transparent substrates carrying a plurality of transparent indium tin oxide conductors thereon. For improved performance, shielding is provided in the form of a sheet of a transparent conductive material connected to ground potential disposed below the grids of conductors as well as a sheet of a metal foil disposed across the extents of the grids of conductors. Viewing of the display panel or backlighting of the display panel can take place through the grids depending on the display panel employed.

REFERENCES:
patent: 4523654 (1985-06-01), Quayle et al.
patent: 4639720 (1987-01-01), Rympalski
patent: 4704501 (1987-11-01), Taguchi et al.
patent: 4853499 (1989-08-01), Watson
patent: 4945348 (1990-07-01), Ibamoto et al.
patent: 4988837 (1991-01-01), Murakami et al.
patent: 5149919 (1992-09-01), Greanias et al.

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