Front Light Guide Plate Micro-Structure Angles for High Contrast
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Solution Overview
Problem
The industry faces challenges in achieving a high-contrast structure for front light guide plates used in reflective display devices, such as tablet computers and e-books, which affects image contrast.
Innovation Solution
A front light module with a reflective display device, a front light guide plate featuring micro-structures with specific angles, and a light emitting unit, where the micro-structures on the front light guide plate refract light to increase the proportion entering the reflective display device, enhancing image contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional flat front light guide plate is used, then the structure is simple and easy to manufacture, but the image contrast is insufficient
Solution Approach 1:
The front light guide plate is segmented into multiple regions with different micro-structure configurations. Specifically, a first region contains micro-structures with a first pattern (e.g., first pitch or shape) and a second region contains micro-structures with a second pattern (e.g., second pitch or shape), allowing different areas to optimize for different contrast requirements while maintaining overall structural feasibility
Solution Approach 2:
Different regions of the front light guide plate are assigned different micro-structure characteristics tailored to local optical requirements. The first region and second region have distinct micro-structure patterns that optimize light extraction and contrast performance for their specific locations, achieving local optimization of image contrast
2Illumination intensity
If micro-structures are added to the front light guide plate to improve contrast, then the light extraction efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
Instead of requiring high precision across the entire front light guide plate, the patent applies micro-structures only in specific regions (first region and second region) where they are most needed for contrast enhancement. This partial application reduces the overall manufacturing precision burden while achieving sufficient light extraction efficiency improvement in critical areas
3Illumination intensity
If uniform micro-structures are applied across the entire front light guide plate, then the light extraction is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The front light guide plate is divided into multiple regions with different micro-structure patterns. The first region has a first micro-structure pattern and the second region has a second micro-structure pattern, which reduces overall device complexity compared to applying a single complex uniform pattern across the entire plate while still achieving improved light extraction efficiency in each region
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 refracted light increases the light entering the reflective display device, improving the contrast of the image by controlling light extraction efficiency between bright and dark states.
Implementation Method 1
the light emitted by the light emitting unit can be refracted through the micro-structure in the front light guide plate, so that the ratio of the light entering the reflective display device increases
Data Source
AI summary
A front light module includes a reflective display device, a front light guide, and a light emitting unit plate. The front light guide plate includes a micro-structure. The micro-structure has a first angle between a surface thereof close to the light emitting unit and an upper surface of the front light guide plate. The micro-structure has a second angle between a surface thereof away from the light emitting unit and the upper surface of the front light guide plate. The micro-structure has a third angle between the surface thereof close to the light emitting unit and the surface thereof away from the light emitting unit. The first angle is within a range between 30 degrees and 60 degrees, the second angle is within a range between 30 degrees and 59 degrees, and the third angle is greater than 90 degrees.