Surface Light Source Module with Optical Adhesive for Reduced Reflection
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Solution Overview
Problem
Conventional front light modules in reflective display devices suffer from reduced visibility due to reflections at the interface between the light guide plate and air gaps under strong ambient light, affecting optical performance.
Innovation Solution
A surface light source module with a light guide plate featuring microstructures and an optical adhesive layer that covers these microstructures, where the microstructures have specific included angles and ratios of line segments, reducing reflections and enhancing light emission in a forward direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an air gap is retained between the light guide plate and glass plate to avoid affecting the optical effect of microstructures, then the optical effect of microstructures is preserved, but reflection occurs at the interface under strong ambient light, reducing visibility
Solution Approach 1:
The patent introduces an optical adhesive layer as an intermediary substance between the light guide plate and the glass plate, replacing the air gap. This adhesive layer has a refractive index that is optimized to reduce reflection at the interface while maintaining the optical effectiveness of the microstructures, thus resolving the contradiction between preserving optical effect and eliminating harmful reflections.
Solution Approach 2:
The patent changes the refractive index parameter of the medium between the light guide plate and glass plate by using an optical adhesive layer with specifically selected refractive index characteristics. This parameter change reduces the reflection coefficient at the interface under strong ambient light while maintaining adequate optical coupling for the microstructures to function effectively.
2Object-affected harmful factors
If the optical adhesive layer completely covers the microstructures, then reflection is reduced, but the microstructures may be obscured affecting light emission
Solution Approach 1:
The optical adhesive layer is applied with varying local properties: it covers the microstructures to reduce reflection, but its thickness and optical characteristics are locally optimized to maintain light emission effectiveness. The adhesive layer's refractive index and thickness are specifically designed to allow light to pass through while minimizing interface reflection, achieving both goals simultaneously through spatially varying optical properties.
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
Improves visibility of reflective display devices under strong ambient light by minimizing reflections and ensuring even light distribution.
Implementation Method 1
this configuration may cause reflection at the interface between the front light module and the air gap under strong ambient light
Implementation Method 2
The first surface is provided with a plurality of microstructures... to emit light beams uniformly
Data Source
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AI summary
A surface light source module includes a light guide plate, a light source component, a covering layer, and an optical adhesive layer. The light guide plate has a first surface, a second surface, and a light incident surface. The first surface has multiple microstructures. The optical adhesive layer is disposed between the light guide plate and the covering layer. Each microstructure has a symmetry plane and a first structural surface. The interface between the first structural surface and the symmetry plane has a first intersection line. The first intersection line includes a first-part line segment, a second-part line segment, and a third-part line segment. A third included angle between the third-part line segment and the first surface is 50-90 degrees. A third length of the third-part line segment is greater than or equal to 5% of the total length of the first intersection line.