Front Light Module Micro-Structure Groups Enhance Luminance
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Solution Overview
Problem
Color electronic readers suffer from reduced luminance and image contrast due to the color filter's absorption of light, which limits the brightness and overall image quality compared to black-and-white electronic readers.
Innovation Solution
A front light module comprising a light guide plate with micro-structure groups and a transparent cover, where the micro-structure groups are arranged to enhance light reflection and emission, increasing the luminance and contrast of the display image by utilizing the difference in refractive indices between the light guide plate material and air in the gap between the micro-structure groups and the transparent cover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a color filter is disposed on a reflective display panel to achieve full-color display, then color saturation is improved, but luminance and image contrast are reduced due to light absorption
Solution Approach 1:
The light guide plate is segmented into multiple micro-structure groups with individual micro-structures, each having specific optical surfaces. This segmentation allows precise control of light paths and reflection angles to maximize luminance while maintaining color filter functionality
Solution Approach 2:
Different regions of the light guide plate have different micro-structure configurations. The first optical surface has a specific inclination angle range (30-50 degrees) while the second optical surface has a different inclination angle range (60-80 degrees), creating local optical quality variations to optimize both luminance and color performance
2Loss of information
If a color filter is used to display full-color images, then color information is improved, but energy efficiency is reduced due to light absorption and re-transmission
Solution Approach 1:
The micro-structure groups are pre-configured with specific inclination angles and geometric shapes before light incidence. This preliminary structural preparation ensures that light is efficiently guided and reflected in optimal directions, reducing energy loss when passing through the color filter
Solution Approach 2:
The light guide plate with micro-structure groups acts as an intermediary between the light source and the color filter. It mediates light transmission by controlling reflection and refraction paths, reducing the energy loss that would otherwise occur during light passage through the color filter
3Illumination intensity
If the light guide plate uses micro-structure groups with specific optical surfaces to enhance light emission, then luminance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies range values for optical surface inclination angles (first surface: 30-50 degrees, second surface: 60-80 degrees) rather than requiring exact fixed values. This parameter approach allows manufacturing flexibility while maintaining optimal optical performance, reducing precision requirements
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 enhanced front light module efficiently emits more light to illuminate the reflective display panel, improving the quality and contrast of the display image by ensuring more light is transmitted in a collimated manner, thereby addressing the limitations of existing color display technologies.
Implementation Method 1
utilizing the difference in refractive indices between the light guide plate material and air in the gap between the micro-structure groups and the transparent cover
Implementation Method 2
arranged to enhance light reflection and emission
Implementation Method 3
ensuring more light is transmitted in a collimated manner
Data Source
AI summary
A front light module including a light guide plate, a light source, a transparent cover lens and an annular connecting unit is provided. The light guide plate includes a first surface, a plurality of micro-structure groups, a second surface and a light entering surface. The first surface includes a first area and a second area surrounding the first area. The micro-structure groups are disposed on the first surface and within the first area. The micro-structure groups have a plurality of adjacent micro-structures, and the micro-structures groups are separate from each other. The light entering surface connects the first surface and the second surface. The light source is disposed beside the light entering surface. The annular connecting unit connects the second area of the first surface and the transparent cover lens, and keeps a gap between the micro-structure groups and the transparent cover lens. A display device is also provided.