LED array for microdisplays or like application
AssigneeSanken Electric Co., Ltd.
InventorsHitoshi Murofushi, Koji Otsuka
Life of this patent
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Abstract
An array of LEDs are grown by epitaxy on row-connecting conductor strips extending in parallel spaced relationship to one another on the surface of a semiconductor substrate and are thereby electrically interconnected in rows. The row-connecting conductor strips are formed by ion implantation of a p-type dopant into parts of an n-type silicon substrate. Column-connecting conductor strips extend over the light-emitting surfaces of the LEDs for electrically interconnecting them in columns. The LEDs are lit up individually by voltage application between one of the row-connecting conductor strips and one of the column-connecting conductor strips.
Claims4
A light-emitting semiconductor device comprising:
- (a) a substrate made from a semiconductor having a first conductivity type, the substrate having a pair of opposite sides;
- (b) a plurality of row-connecting strips formed in, and constituting integral parts of, the substrate and having a second conductivity type opposite to the first conductivity type;
- (c) a plurality of LEDs formed on the row-connecting conductor strips in the substrate and arranged in rows and columns, each row of LEDs being electrically interconnected by one of the row-connecting conductor strips, each LED having a light-emitting surface facing away from the substrate;
- (d) a plurality of column-connecting conductor strips each extending over the light-emitting surfaces of one column of LEDs for electrically interconnecting them;
- and
- (e) a plurality of row terminals formed on the row-connecting conductor strips for connection to external circuitry, the row terminals being arranged alternately along the pair of opposite sides of the substrate,
- whereby the LEDs are lit up individually by voltage application between one of the row-connecting conductor strips and one of the column-connecting conductor strips.
Dependencies are inferred from the claim text.