Electronic sketch pad

Details Electronic sketch pad Electronic sketch pad

1981-01-12

1987-01-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340707, 340365C, G09G 300

Patent

active

046397205

ABSTRACT:
A graphics input/output device contains a graphics input pad having an array of transparent capacitive pixels the capacitance characteristics of which are changed in response to the passing of a conductive-tipped stylus over the surface of the pad. This change in capacitance is sensed by sense buffers disposed along the columns of the matrix, as the rows are scanned at a prescribed scanning rate.
The sensed data is read out of the sense buffer and loaded into a RAM. An array of display pixels formed of an LCD matrix is addressed by a scan sequence control unit, and the energization of the display pixels is multiplexed with the read-out scanning of the sensed data, so as to present to the user a real time generated image of the graphics created by the stylus. As a result, it appears to the user that the stylus is actually "writing" on the display pad.

REFERENCES:
patent: 3128458 (1964-04-01), Romero
patent: 3932862 (1976-01-01), Graven
patent: 4177354 (1979-12-01), Matthews
patent: 4224615 (1980-09-01), Penz
patent: 4232311 (1980-11-01), Agneta
patent: 4257117 (1981-03-01), Besson
patent: 4290052 (1981-09-01), Eichelberger et al.
patent: 4290061 (1981-09-01), Serrano
patent: 4373784 (1983-02-01), Nonomura et al.

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