Cathode ray tube optical filter device with cursor pointing func

Details Cathode ray tube optical filter device with cursor pointing func Cathode ray tube optical filter device with cursor pointing func

1993-08-18

1994-07-12

Coles, Sr., Edward L.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

348835, G09G 100

Patent

active

053292910

ABSTRACT:
A crt optical filter device includes a transparent plastic sheet and a transparent glass panel, each of which is provided with a transparent conductive circuit layer and a pair of conductors. The outer surface of the glass panel is disposed adjacent to the inner surface of the transparent plastic sheet, while the inner surface thereof is to be disposed adjacent to a screen of a computer monitor. A plurality of spacers, which are made of an insulative material, normally space apart the conductive circuit layers of the transparent plastic sheet and the glass panel. An interface card is connected electrically to the conductors and is to be connected electrically to a computer. The interface card receives analog X and Y signals that correspond to a selected part of the transparent plastic sheet from the conductors when the conductive circuit layers are brought into electrical contact due to application of pressure on the selected part of the transparent plastic sheet. The interface card processes the analog X and Y signals into corresponding digital signals for controlling the computer to move a cursor on the screen of the computer monitor so as to coincide with the selected part of the transparent plastic sheet and for controlling the computer to accomplish predetermined functions.

REFERENCES:
patent: 4017848 (1977-04-01), Tannas, Jr.
patent: 4634845 (1987-01-01), Hale et al.
patent: 4922061 (1990-05-01), Meadows et al.

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