Front Light Module Microstructure Layout for Uniform Illumination
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Solution Overview
Problem
Reflective display devices require uniform illumination across the visible area, which existing technologies fail to achieve effectively due to insufficient consideration of microstructure distribution and density relative to the light source.
Innovation Solution
A front light module with a light guide plate and linear light strip, where microstructure distribution density and distance from the light source follow the equation y=Kx^n, with K being a constant and n ranging from 1.5 to 3.0, ensuring uniform illumination by compensating for light intensity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source is positioned around the periphery area of the reflective display module, then the display device can provide illumination in low ambient light conditions, but the illumination becomes non-uniform across the visible area
Solution Approach 1:
The patent applies local quality by varying the distribution density of microstructures across different regions of the light guide plate. The density of microstructures is adjusted locally based on the distance from the light source, with higher density near the light source and lower density farther away. This local variation in microstructure density compensates for the non-uniform light distribution, achieving uniform illumination across the entire visible area.
Solution Approach 2:
The patent changes the parameter of microstructure distribution density as a function of position. By following the power law relationship y=Kx^n, the density parameter varies continuously across the light guide plate, transforming the non-uniform light output from the periphery-mounted LED strip into a uniform illumination pattern across the display surface.
2Stability of the object's composition
If microstructures are added to the light guide plate to redistribute light, then illumination uniformity can be improved, but the device complexity increases
Solution Approach 1:
The patent merges the illumination function and the light redistribution function into a single integrated component - the light guide plate. By incorporating microstructures directly into the light guide plate, the design eliminates the need for separate diffusion plates or prism plates that would otherwise be required, thereby reducing overall device complexity while achieving uniform illumination.
Solution Approach 2:
The light guide plate serves multiple functions simultaneously: it guides light from the periphery-mounted LED strip, redistributes the non-uniform light output through its microstructures, and provides the illumination for the reflective display. This multi-functionality reduces the number of components needed and simplifies the overall device structure.
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 design achieves uniform illumination across the display area by guiding light out of the light guide plate, maintaining consistent light intensity despite distance from the light source.
Implementation Method 1
one of the surfaces is formed with a plurality of microstructures... guiding light out of the light guide plate... achieves uniform illumination across the display area
Data Source
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AI summary
The present disclosure provides a front light module, which includes a light source and a light guide plate. The light source includes a linear light strip which includes a plurality of light-emitting diode elements. The light guide plate and the light source are disposed on a same plane. The light guide plate has two opposite surfaces, wherein one of the two surfaces has a plurality of microstructures, and the other of the two surfaces is free of any microstructures. A distribution density of the microstructures and distances of the microstructures from the light source satisfy the following equation: y=Kxn, wherein y is the distribution density of the microstructures, measured in units of number/square millimeter; x is a distance between a sampling centerline and a side of the light guide plate closer to the light source, measured in units millimeter; K is a constant; and n is 1.5-3.0.