Array of light-emitting elements with multilayer wiring
AssigneeOki Data Corporation
InventorsMasumi Taninaka, Mitsuhiko Ogihara
Life of this patent
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Abstract
An array of light-emitting elements is divided into cells, the cells are divided into electrically isolated blocks, and a multilayer wiring scheme is employed in which each block has two wire-bonding pads. A first wire leads from the first wire-bonding pad to one of the light-emitting elements in the block. A second wire leads from the second wire-bonding pad to an electrode disposed adjacent to the light-emitting elements in the block, preferably leading to a point near the middle of this electrode. The relative positions of the first and second bonding pads are varied so that the first wire can reach light-emitting elements in different positions in different blocks without crossing the second wire in any block.
Claims15
An array of light-emitting elements having a substrate with a semiconductor layer, a first dielectric layer formed on the semiconductor layer, and a second dielectric layer formed on the first dielectric layer, the first dielectric layer and the second dielectric layer having respective openings, the array being divided into a plurality of blocks that are electrically isolated by isolation trenches formed in the semiconductor layer, the blocks constituting one or more cells,
- each block having:
- a row of light-emitting elements formed in the semiconductor layer by selective diffusion of an impurity;
- a plurality of first electrodes formed on the first dielectric layer, electrically connected to the light-emitting elements through openings in the first dielectric layer;
- a plurality of first wires formed on the first dielectric layer, electrically connected to respective first electrodes;
- a first electrode pad formed on the first dielectric layer, electrically connected to one of the first wires, thus to one of the first electrodes;
- a second electrode formed on the semiconductor layer adjacent the row of light-emitting elements;
- a second wire formed on the first dielectric layer, electrically connected to the second electrode through an opening in the first dielectric layer, the second wire being wholly disposed to one side of said one of the first wires;
- and
- a second electrode pad formed on the first dielectric layer, electrically connected to the second wire;
- each cell having:
- a plurality of common wires formed on the second dielectric layer, the number of common wires being equal to the number of light-emitting elements per block, each first wire in each block being electrically connected through an opening in the second dielectric layer to one of the common wires;
- wherein relative positions of the first electrode pad and the second electrode pad are varied in different blocks in the cell, enabling the first wires connected to the first electrode pads to be electrically connected to light-emitting elements in different positions in different blocks without crossing the second wires.
An array of light-emitting elements, the array being divided into electrically isolated blocks linked by common wiring, each block including:
- a row of light-emitting elements;
- an electrode disposed adjacent and parallel to the row of light-emitting elements;
- a first pad for attachment of a bonding wire;
- a first wire electrically connecting the first pad to one of the light-emitting elements in the block;
- a second pad for attachment of another bonding wire;
- and
- a second wire electrically connecting the second pad to said electrode;
- wherein the rows of light-emitting elements in the blocks are mutually aligned to form a single row of light-emitting elements having a first end and a second end;
- and
- the blocks are divided into a first group of blocks in which the first pad and the first wire are closer than the second pad and the second wire to the first end, and a second group of blocks in which the second pad and the second wire are closer than the first pad and the first wire to the first end.
Dependencies are inferred from the claim text.