Light Source Device Wiring Configuration for Compact Substrate Design
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Solution Overview
Problem
Existing light source devices with multiple light emitting elements require a large substrate area to prevent short circuits between light emitting elements and protective elements, limiting the miniaturization of the device due to the need for separate wiring and insulating margins.
Innovation Solution
A light source device design where the top electrodes of light emitting elements and protective elements have the same polarity, with specific wiring configurations that include first, second, and third wires to connect these elements, allowing for efficient arrangement and discrete control of light emitting elements while preventing short circuits, thereby reducing the substrate area required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wirings are used for light emitting elements and protective elements, then short circuits are prevented, but the substrate area increases
Solution Approach 1:
The patent combines the wirings for light emitting elements and protective elements into a common wiring structure. By making the upper-surface-side electrodes of both element types have the same polarity and connecting them to the same wiring, the patent eliminates the need for separate wirings, thereby reducing substrate area while preventing short circuits through the polarity arrangement.
Solution Approach 2:
The patent uses vertical stacking to arrange light emitting elements and protective elements in different layers on the substrate. By utilizing the third dimension (height), the patent allows both element types to share the same wiring plane without short circuits, as their electrodes are at different vertical positions, thus reducing the required substrate area.
2Reliability
If insulating margins are increased between wirings, then short circuits are prevented, but the device size increases
Solution Approach 1:
The patent merges the wiring paths for light emitting elements and protective elements by making them share common wirings. This eliminates the need for large insulating margins between separate wirings, as there is only one wiring structure with unified polarity, thereby reducing device size while maintaining short circuit prevention.
3Power
If the number of light emitting elements is increased, then light output is improved, but the substrate area increases due to wiring requirements
Solution Approach 1:
The patent implements a common wiring structure where multiple light emitting elements and their protective elements share the same wirings. This merged wiring approach allows more elements to be packed onto the substrate without proportionally increasing wiring area, enabling higher light output with limited substrate area growth.
Solution Approach 2:
The patent arranges elements in vertical layers, allowing multiple light emitting elements to be stacked or closely packed on the substrate. This three-dimensional arrangement, combined with shared wirings, enables increased light output without linearly increasing substrate area.
Data Source
AI summary
A light source device includes at least one first wiring, a plurality of second wirings, a plurality of light emitting elements each having a lower-surface-side electrode connected to a respective one of the at least one first wiring, a plurality of protective elements each having a lower-surface-side electrode connected to a respective one of the plurality of second wirings each corresponding to a respective one of the plurality of light emitting elements, each of the plurality of protective elements connected to a respective one of the plurality of light emitting elements, a plurality of first wirings each connecting an upper-surface-side electrode of each of the plurality of light emitting elements and a respective one of the plurality of second wirings, a plurality of second wires each connecting the upper-surface-side electrodes of two adjacent ones of the protective elements; and a plurality of third wires each connecting an upper-surface-side electrode of a respective one of the plurality of protective elements and a corresponding one of the at least one first wiring. The upper-surface-side electrodes of the plurality of light emitting elements and the upper-surface-side electrodes of the plurality of protective elements are of a same polarity, and the plurality of first wires are disposed below the plurality of second wires.