Drive control system for display devices

Details Drive control system for display devices Drive control system for display devices

1981-12-16

1983-12-27

Perkey, William B.

Music

Accessories

Teaching devices

84470R, 340365S, 340802, G09B 1508, G06F 302

Patent

active

044223650

ABSTRACT:
Light-emitting diodes (LEDs) are provided for operation keys such as a tone select switch or performance keys of an electronic musical instrument. The display drive lines for the LEDs are arranged in the form of a matrix, and a dynamic drive signal is supplied to them. With these LEDs, the operation state of the operation keys is indicated. The LEDs are adapted to indicate the performance key to be operated next to the player.

REFERENCES:
patent: 3950743 (1976-04-01), Hatano et al.
patent: 3990070 (1976-11-01), Spence
patent: 4051471 (1977-09-01), Hatano et al.
patent: 4281579 (1981-08-01), Bennett, Sr.

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