Matrix display assembly having multiple point lighting

Details Matrix display assembly having multiple point lighting Matrix display assembly having multiple point lighting

1990-07-16

1991-06-11

Brittain, James R.

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Alphanumeric device

40452, G09F 930

Patent

active

050221710

ABSTRACT:
This graphic character matrix display assembly has a support providing a nonreflecting background for a multiplicity of display units arranged for cooperatively displaying the character. Each of the display units comprises a flat display disk having opposite sides. An electromagnet rotates the disk between display position and reversed position. A light source at each disk projects a light beam through a peripheral cutout in the disk when the disk is in display position. The light beam also projects an outline of the disk by backlighting. The periphery of the disk blocks the light beam when the disk is in reversed position. The light source for each disk may be an incandescent lamp, emitting diodes or the end of a light pipe.

REFERENCES:
patent: 1594703 (1926-08-01), Ballerini
patent: 4389804 (1983-06-01), Seibert et al.
patent: 4761905 (1988-08-01), Black
patent: 4769638 (1988-09-01), Woolfolk
patent: 4800381 (1989-01-01), Joseph et al.
patent: 4833806 (1989-05-01), Gars
patent: 4860470 (1989-08-01), Browne
patent: 4974353 (1990-12-01), Norfolk

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