Light Source Device Single-Side Terminal Design
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Solution Overview
Problem
Existing light source devices with lead wires inserted through the substrate increase device thickness and planar size, leading to larger apparatuses when multiple devices are configured, especially when combined with drive circuits that require connections on both sides of the package.
Innovation Solution
A light source device configuration where input terminals project from one side of the base substrate, allowing for a compact design with reduced drive circuit size and efficient light emission, and enabling the integration of light emitting elements into sub-units for reduced optical variations and easier repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lead wires are inserted through the substrate of the light source device, then electrical connection is achieved, but the thickness of the device is increased
Solution Approach 1:
The patent extracts the lead wires from the substrate structure and relocates them to project from one side of the base substrate. This separation allows the substrate to be thinner while maintaining electrical connection functionality through the externally positioned lead wires that connect to terminals on the same side.
Solution Approach 2:
The patent transitions from a through-substrate connection approach (z-dimension penetration) to a side-projection approach (x-y plane arrangement). By positioning lead wires and terminals on one side of the base substrate, the design reduces thickness requirements while achieving the same electrical connection purpose through spatial reconfiguration.
2Reliability
If terminals are provided on both sides of the package, then electrical connection is achieved, but the planar size of the device and drive circuit is increased
Solution Approach 1:
The patent merges the functions of both-sided terminals into a single-sided terminal configuration. By providing both first polarity terminals and second polarity terminals on one side of the base substrate, the design eliminates the need for opposite-side terminals, thereby reducing the drive circuit's planar size while maintaining complete electrical connection capability.
Solution Approach 2:
The single side of the base substrate serves multiple functions by accommodating both types of polarity terminals, lead wire connections, and drive circuit interfaces. This multi-functional arrangement on one side replaces the traditional distributed terminal layout across both sides, achieving space efficiency without compromising electrical connection reliability.
3Illumination intensity
If multiple light source devices are configured in an apparatus, then lighting coverage is improved, but the overall apparatus size is increased
Solution Approach 1:
The patent enables multiple light source devices to be closely integrated by reducing their individual terminal and connection requirements to one side. This compact configuration allows multiple devices to be arranged in tighter spaces within an apparatus, improving lighting coverage density without proportionally increasing the overall apparatus footprint.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables high luminance light emission with reduced device size, suppressed luminance variations, and simplified drive circuits, while allowing for efficient light distribution and easy maintenance by integrating light emitting elements into sub-units.
Implementation Method 1
a light source device (light emitting diode (LED) module)
Implementation Method 2
The plurality of LEDs include a light emitting element row formed of a plurality of LEDs arranged in one row
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A light source device includes: a base substrate; a plurality of light emitting elements disposed on the base substrate along each of an X-direction and a Y-direction crossing the X-direction; and a first polarity terminal and a second polarity terminal for supplying power to the plurality of light emitting elements. The first polarity terminal and the second polarity terminal project from one side of the base substrate in the X-direction as viewed in a Z-direction orthogonal to the X-direction and the Y-direction.