Light Guide Plate Microstructures for Uniform Front Light Emission
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Solution Overview
Problem
Existing front light modules in reflective display devices suffer from non-uniform light emission, particularly in low ambient light conditions.
Innovation Solution
A surface light source module featuring a light guide plate with microstructures on its surface, where each microstructure has a symmetry plane perpendicular to the surface and specific geometric properties, and an optical adhesive layer covering these microstructures, to enhance light uniformity and reduce stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate with microstructures is used to make light emitted uniformly, then light uniformity is improved, but non-uniform light emission persists
Solution Approach 1:
The patent applies local quality by creating microstructures with specific geometric shapes (ellipsoids, cylinders, or prisms) at different positions on the light guide plate surface. Each microstructure has tailored dimensions and orientations to control light scattering locally, ensuring uniform light emission across the entire surface while addressing the persistence of non-uniformity through precise local geometry design.
Solution Approach 2:
The patent employs parameter changes by varying the geometric parameters of the microstructures, including their height, width, depth, and orientation angles. By adjusting these parameters, the patent optimizes light scattering characteristics to achieve uniform emission, transforming the insufficient light uniformity into consistent illumination through controlled parameter variation.
2Illumination intensity
If microstructures are added to the light guide plate to improve light uniformity, then light emission evenness is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light guide plate surface into multiple regions, each containing microstructures with specific geometric characteristics. This segmentation allows independent optimization of light scattering in different areas while maintaining overall uniformity, managing device complexity through modular microstructure design rather than a monolithic approach.
Solution Approach 2:
The patent utilizes asymmetry by incorporating microstructures with non-uniform geometric shapes (ellipsoids, cylinders, or prisms) that have different dimensions and orientations. This asymmetric design enables precise control over light scattering patterns, achieving even light emission while managing complexity through purposeful geometric variation rather than random structures.
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 provides even light emission in a forward direction, improving visibility and reducing stray light, especially under strong ambient conditions.
Implementation Method 1
a light guide plate... to make light emitted uniformly
Implementation Method 2
a plurality of microstructures are disposed on an upper surface of the light guide plate to make the light emitted more uniformly
Data Source
AI summary
A surface light source module includes a light guide plate. The light guide plate has a first surface on which a plurality of microstructures are provided. Each microstructure has a first structural surface and a symmetry plane, a boundary between the first structural surface and the symmetry plane is provided with a first intersection line, the first intersection line includes a first line segment part, and the first line segment part has a first end and a second end that are opposite to each other. There is a first height between the first end and the first surface, there is a second height between the second end and the first surface, each microstructure has a maximum depth, and an absolute value of a difference between the first height and the second height is greater than or equal to one-third of the maximum depth. A display device is also provided.