Light-Emitting Element Array Wiring for Higher Density and Lower Delay
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Solution Overview
Problem
Existing light-emitting element arrays face challenges in increasing density due to limited space for wiring and increased operation delay with higher element density, as existing configurations struggle with wire formation and resistance.
Innovation Solution
A light-emitting element array design featuring first and second wires that overlap with and are electrically connected to specific light-emitting elements, allowing for independent emission while increasing density, with the wires formed in the same layer and separated by insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the interval between light-emitting elements is reduced to increase density, then the density of light-emitting elements is improved, but the space for providing wires is limited making it difficult to form wires
Solution Approach 1:
The patent transitions from planar wiring to three-dimensional wiring by having wires extend in the thickness direction (vertical direction) of the light-emitting element array. This vertical wiring approach utilizes the Z-dimension to bypass the limited horizontal space, allowing wires to connect to light-emitting elements without requiring additional lateral space, thus resolving the contradiction between element density and wire formation ease.
Solution Approach 2:
The patent segments the wiring structure into multiple independent wires, each dedicated to specific light-emitting elements. This segmentation allows for optimized wire routing where each wire can be independently positioned and sized, reducing interference between adjacent wires and enabling efficient use of the limited space while maintaining manufacturability.
2Quantity of substance
If the density of light-emitting elements is increased, then the quantity of light-emitting elements is improved, but the operation delay increases
Solution Approach 1:
By extending wires in the thickness direction rather than laterally, the patent reduces the wire length that current must traverse. This vertical routing shortens the electrical path compared to horizontal routing across dense element arrays, thereby reducing resistance and capacitance effects that cause operation delay, while still accommodating high element density.
3Reliability
If the width of wires is increased to reduce wiring resistance, then the wiring resistance is improved, but the device complexity increases
Solution Approach 1:
The patent achieves reduced wiring resistance by extending wires in the thickness direction with sufficient width, utilizing the vertical dimension to provide adequate conduction cross-section without requiring complex lateral wire routing. This approach maintains simple wire geometry while achieving low resistance through optimized vertical extent and width in the thickness direction.
Data Source
AI summary
A light-emitting element array according to the present technology includes: a light-emitting element group; a first wire; and a second wire. The light-emitting element group includes a plurality of first light-emitting elements and a plurality of second light-emitting elements that are arrayed in a planar manner to form a light-emitting element surface. The first wire extends in a direction parallel to the light-emitting element surface, has a region overlapping with the plurality of first light-emitting elements and a region overlapping with the plurality of second light-emitting elements as viewed from a direction perpendicular to the light-emitting element surface, is electrically connected to the plurality of first light-emitting elements, and is not electrically connected to the plurality of second light-emitting elements. The second wire extends in a direction parallel to the light-emitting element surface, has a region overlapping with the plurality of first light-emitting elements and a region overlapping with the plurality of second light-emitting elements as viewed from a direction perpendicular to the light-emitting element surface, is electrically connected to the plurality of second light-emitting elements, and is not electrically connected to the plurality of first light-emitting elements.