Tapering Light Guide Plate Optical Elements Brightness Uniformity
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Solution Overview
Problem
Edge-light type surface light source devices exhibit non-uniform light distribution, leading to increased brightness in central areas and decreased brightness in peripheral areas, especially when using linear arrays of light emitting diodes, resulting in in-plane variation of brightness and patterns of alternating bright and dark portions.
Innovation Solution
A light guide plate with specific optical elements arranged to increase the proportion of optical elements in central areas and reduce them in peripheral areas, where the width and height of optical elements change along the light guide direction, optimizing light exit angles and distribution to enhance brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light scattering components are dispersed uniformly in the light guide plate, then light can exit gradually at various positions, but the amount of exiting light is not uniform and tends to be large in areas close to the light source
Solution Approach 1:
The patent applies local quality by varying the density of light scattering components according to position. Specifically, the density is set to be higher in peripheral areas and lower in central areas of the light guide plate. This non-uniform distribution compensates for the natural tendency of light to concentrate in certain areas, achieving uniform light exit across the entire surface while optimizing overall light utilization efficiency.
2Ease of manufacture
If the light guide plate structure is simplified, then manufacturing is easier, but in-plane variation of brightness and alternating bright and dark patterns occur when using LED arrays
Solution Approach 1:
The patent introduces position-dependent variation in light scattering component density to eliminate brightness non-uniformity and alternating patterns caused by LED arrays. By making the optical properties location-specific rather than uniform, the invention resolves the contradiction between structural simplicity and brightness uniformity, achieving homogeneous illumination without complex structural modifications.
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 effectively increases brightness perception in central areas while reducing excessive brightness in peripheral areas, minimizing in-plane variation of brightness and improving light utilization efficiency.
Implementation Method 1
a light scattering component is dispersed in the light guide plate in order to change the direction of light traveling in the light guide plate
Implementation Method 2
The light traveling in the light guide plate is subject to the optical action of the light guide plate and is caused to gradually exit the light exit surface as it travels in the light guide plate
Data Source
AI summary
A light guide plate includes a body portion, first unit optical elements extending on the body portion in the light guide direction, and second unit optical elements disposed in between the first unit optical elements on the body portion. The width of each first unit optical element gradually decreases from that at the center to that at each end in the light guide direction. The ratio of the height to the width in each first unit optical element at the center is higher than the ratio of the height to the width in each second unit optical element.