Planar Light Source Electrode Layout to Reduce Wiring Light Absorption
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Solution Overview
Problem
Existing planar light sources face challenges in effectively utilizing light from light emitting diodes due to absorption by wiring materials, leading to reduced luminance and increased power consumption.
Innovation Solution
A planar light source design that includes a light guide member covering the light source with exposed electrodes, a wiring substrate connected via conducting members through aligned through holes in a light reflecting sheet, and a method of manufacturing this structure to minimize light absorption by the wiring layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring material is used to connect electrodes to wiring layer, then electrical connection is achieved, but light absorption increases reducing luminance efficiency
Solution Approach 1:
The patent extracts the wiring material from the light path area by creating through-holes in the light guide member, allowing electrodes to extend directly through the light guide without wiring material in the light extraction region. This removes the harmful light-absorbing wiring material from the optical path while maintaining electrical connectivity through the through-holes.
Solution Approach 2:
The patent introduces an intermediary structure (through-holes with conducting members) that enables electrical connection without requiring traditional wiring material in the light path. The conducting members fill the through-holes and provide electrical connectivity while the light guide member structure mediates between the light source and wiring substrate.
2Reliability
If wiring material is present in light path, then electrical connection is established, but light extraction efficiency decreases
Solution Approach 1:
The wiring material is extracted from the light path by creating through-holes that allow electrodes to pass through the light guide member directly. This eliminates the wiring material's interference with light extraction while maintaining electrical connectivity through the conducting members in the through-holes.
Solution Approach 2:
The patent transitions from a planar wiring layout to a three-dimensional structure with through-holes penetrating the light guide member. This dimensional change allows electrodes to connect to the wiring layer from the light source side, bypassing the need for wiring material in the light extraction path.
3Use of energy by stationary object
If power consumption is reduced, then energy efficiency improves, but luminance output may decrease
Solution Approach 1:
The patent converts the harmful light absorption by wiring material into a benefit by removing the wiring material from the light path. This eliminates energy loss through absorption, allowing more light energy to reach the viewer while maintaining the same power consumption, thus improving overall energy efficiency and luminance output.
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 design effectively utilizes emitted light by reducing absorption by the wiring material, enhancing luminance and reducing power consumption.
Implementation Method 1
a light guide member covering the light source while the electrodes are exposed from the light guide member
Implementation Method 2
a light reflecting sheet interposed between the light guide member and the wiring substrate
Data Source
AI summary
A planar light source includes a light source, a light guide member, a wiring substrate, a light reflecting sheet and a pair of conducting members. The light source has a pair of electrodes on one face. The light guide member covers the light source while the electrodes are exposed from the light guide member. The wiring substrate has a wiring layer. The light reflecting sheet is interposed between the light guide member and the wiring substrate and defining a pair of first through holes at positions aligned with the electrodes on a one-to-one basis. The conducting members are respectively disposed in the first through holes and electrically connecting the electrodes to the wiring layer.