Transparent Light Emitting Module With Mesh Electrode Light Extraction
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Solution Overview
Problem
Existing light emitting devices face challenges in reducing light loss, improving light extraction efficiency, delaying moisture penetration, enhancing reliability, and maintaining high color purity while operating on transparent surfaces like glass.
Innovation Solution
A light emitting apparatus comprising a light transmissive layer, a base film, and a plurality of light emitting devices, where the base film has a mesh-shaped electrode and different transmittance regions, including a low transmittance layer to adjust light paths and improve heat dissipation, allowing for efficient light extraction and moisture delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a reflective electrode is formed on the P-type semiconductor layer and extensions are formed for current distribution, then current distribution is improved and heat dissipation is enhanced, but light loss occurs due to the P-electrode pad
Solution Approach 1:
The patent extracts the P-electrode pad from the light emission path by using a transparent or translucent base film that allows light to pass through while still providing electrical connection. This removes the light-blocking electrode from the optical path, reducing light loss while maintaining heat dissipation functionality through alternative transparent conductive structures.
Solution Approach 2:
The patent applies different properties to different regions: the base film has high transmittance in the light emission area while the electrode layer provides conductive properties where needed. This local differentiation allows simultaneous optimization of light transmission and electrical function without compromise.
2Reliability
If the electrode layer covers a large area of the base film, then electrical connection is improved, but light transmittance decreases
Solution Approach 1:
The patent segments the electrode layer into a mesh pattern rather than using a continuous large-area electrode. This segmentation provides sufficient electrical connection points while leaving gaps that allow light to pass through, thus balancing electrical reliability with optical transparency.
Solution Approach 2:
The electrode layer is strategically positioned and sized to provide local electrical connection where needed while maintaining high transmittance in the overall base film. The mesh structure concentrates conductive material only where electrical function is required, preserving light transmission in other areas.
3Loss of energy
If multiple layers with different refractive indexes are used, then light extraction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent introduces optical property variations locally within the base film rather than requiring multiple separate layers. By creating regions with different refractive indexes within a single integrated base film structure, the patent achieves improved light extraction efficiency while avoiding the complexity of stacking multiple discrete layers.
4Productivity
If the light emitting devices are arranged closely to increase display area, then productivity is improved, but moisture penetration risk increases
Solution Approach 1:
The patent uses a continuous base film structure that acts as a protective barrier against moisture penetration. This thin film encapsulation provides reliable moisture protection even when light emitting devices are arranged closely together, as the continuous film structure maintains integrity regardless of device spacing or density.
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 reduced light loss, improved light extraction efficiency, delayed moisture penetration, enhanced reliability, and high color purity by optimizing light path adjustments and heat dissipation, while maintaining transparency when not in use.
Implementation Method 1
a light transmissive layer; a base film disposed on at least a surface of the light transmissive layer... the plurality of light emitting devices maintains a light transmittance of 70% or more when not turned on
Implementation Method 2
The light transmissive layer may include a plurality of layers having different indexes of refraction
Data Source
AI summary
A light emitting module is disclosed. The light emitting module includes: a light transmissive layer transmitting light; and a film disposed on at least a surface of the light transmissive layer, an electrode layer disposed on the film; and a plurality of light emitting devices disposed on the film and electrically connected to the electrode layer, where in the electrode layer cover 50% or less of an extent of the base film.