Drive control system for display devices
First Claim
Patent Images
1. An electronic musical instrument having a plurality of operation keys and display devices provided for said respective operation keys, comprising:
- matrix wiring means coupled to said operation keys and including intersecting row lines and column lines for wiring said plurality of operation keys in a matrix;
wiring means coupled to said display devices for connecting display devices corresponding to said plurality of operation keys to said row lines and column lines of said matrix wiring means at the intersections of said row lines and column lines of said matrix;
scanning signal generating means coupled to said matrix wiring means for supplying a scanning signal to said matrix wiring means for scanning said plurality of operation keys; and
drive signal generating means coupled to said matrix wiring means for supplying a drive signal to said matrix wiring means for selectively turning one said display devices.
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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.
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Citations
12 Claims
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1. An electronic musical instrument having a plurality of operation keys and display devices provided for said respective operation keys, comprising:
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matrix wiring means coupled to said operation keys and including intersecting row lines and column lines for wiring said plurality of operation keys in a matrix; wiring means coupled to said display devices for connecting display devices corresponding to said plurality of operation keys to said row lines and column lines of said matrix wiring means at the intersections of said row lines and column lines of said matrix; scanning signal generating means coupled to said matrix wiring means for supplying a scanning signal to said matrix wiring means for scanning said plurality of operation keys; and drive signal generating means coupled to said matrix wiring means for supplying a drive signal to said matrix wiring means for selectively turning one said display devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An electronic apparatus having a plurality of operation keys and display devices provided for said respective operation keys, comprising:
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matrix wiring means coupled to said operation keys and including intersecting row lines and column lines for wiring said plurality of operation keys in a matrix; wiring means coupled to said display devices for connecting said display devices corresponding to said plurality of operation keys to said row lines and column lines of said matrix wiring means at the intersections of said row lines and column lines of said matrix; scanning signal generating means coupled to said matrix wiring means for supplying a scanning signal to said matrix wiring means for scanning said plurality of operation keys; key operation detecting means coupled to said matrix wiring means for detecting key depressions of said operation keys according to signals delivered from said matrix wiring means; and drive signal generating means coupled to said matrix wiring means and to said key operation detecting means for supplying a drive signal to said matrix wiring means for selectively turning on said display devices in accordance with the detected key depressions of said operation keys. - View Dependent Claims (10, 11, 12)
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Specification