Automotive Lamp Wiring Substrate for Uniform LED Voltage
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Solution Overview
Problem
Automotive lamps using semiconductor light-emitting elements face challenges with low light uniformity due to non-uniform voltage application, leading to decreased brightness across the lamp area.
Innovation Solution
A lamp design featuring a wiring substrate with bus electrodes and electrode lines that gradually increase in distance and width towards the central portion, along with protrusions and transparent electrodes, ensures uniform voltage distribution across semiconductor light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lamp has a large area, then the illumination coverage is improved, but the voltage application uniformity deteriorates
Solution Approach 1:
The patent applies local quality by varying the distance between semiconductor light-emitting elements and electrode lines across different regions of the lamp. Specifically, elements in the central portion are positioned closer to electrode lines than elements at the end portions, creating non-uniform spacing that compensates for voltage distribution variations in large-area lamps, thereby maintaining uniform voltage application and light emission across the entire lamp area.
2Quantity of substance
If semiconductor light-emitting elements are densely arranged, then the light output is improved, but the voltage distribution uniformity deteriorates
Solution Approach 1:
The patent implements local quality by adjusting the spacing between light-emitting elements and electrode lines based on position. Central elements are placed closer to electrode lines while end elements are positioned farther away, creating region-specific configurations that ensure uniform voltage distribution even when elements are densely arranged throughout the lamp area.
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
This design allows for consistent voltage application to all semiconductor light-emitting elements, ensuring they emit light with the same brightness and improving light uniformity, particularly in larger lamp areas.
Implementation Method 1
a plurality of semiconductor light-emitting elements aligned along a direction that the electrode lines are formed and disposed to be spaced apart from adjacent electrode lines by a predetermined distance
Data Source
AI summary
Discussed is a lamp or a lighting device including a wiring substrate; a bus electrode provided on the wiring substrate; a plurality of electrode lines provided on the wiring substrate, and extending from the bus electrode, each electrode line having one end and a central portion located between the one end and the bus electrode; a plurality of semiconductor light-emitting elements aligned along an extending direction of the plurality of electrode lines, and disposed to be spaced apart from adjacent electrode lines of the plurality of electrode lines by varying distances, respectively; and a plurality of transparent electrodes that respectively provide an electrical connection between the plurality of electrode lines and the plurality of semiconductor light-emitting elements, wherein the respective varying distances between the plurality of semiconductor light-emitting elements and each of the adjacent electrode lines decrease toward the central portion of the each electrode line.