Light Guide Plate V-Groove Luminance Control
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Solution Overview
Problem
Conventional light guide plates for edge-lit backlights face challenges in achieving consistent luminance and high-quality imaging with low light source output, as they often result in luminance inconsistency and require increased luminance across the entire surface.
Innovation Solution
A light guide plate design featuring a first V-shaped groove with a V-shaped cross-section on its surface, where the groove is deepest at the center and shallower towards the ends, optimizing light reflection and distribution to achieve high luminance in the center with decreasing luminance towards the periphery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light guide plates are used to increase luminance across the entire surface, then luminance consistency is improved, but energy consumption increases
Solution Approach 1:
The light guide plate implements local quality by creating V-shaped grooves with varying depths across different regions. The groove depth is greatest at the center and decreases toward the edges, causing light to be reflected more strongly at the center and less at the periphery. This non-uniform groove structure optimizes luminance distribution locally in different regions, achieving consistent overall luminance while reducing total energy consumption.
2Illumination intensity
If uniform luminance is increased across the entire surface, then imaging quality is improved, but light source output requirements increase
Solution Approach 1:
The patent applies local quality by designing V-shaped grooves with spatially varying depths. The groove depth parameter changes from the center toward the edges, creating region-specific light reflection characteristics. This allows the light guide plate to achieve high luminance in the center region with lower overall light source output, as each region contributes appropriately to the final luminance distribution.
3Illumination intensity
If V-shaped grooves are made deepest at the center and shallower at edges, then luminance distribution is optimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by systematically varying the groove depth parameter across the light guide plate surface. The groove depth is greatest at the center and decreases toward the edges according to a controlled gradient. This continuous parameter variation optimizes luminance distribution while the gradual change in depth reduces the complexity of manufacturing precision requirements compared to abrupt transitions.
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
This design enables high-quality imaging with low light source output and efficient, low-energy backlights without the need for uniform luminance across the entire surface, effectively addressing luminance inconsistency.
Implementation Method 1
an emitting portion which emits the light guided in the first direction by the light guiding path, by reflecting the light towards the first surface in the third direction
Data Source
AI summary
A light guide plate having a first surface and a second surface opposite the first surface receives light in a first direction parallel with the second surface and emits the light towards the first surface in a third direction perpendicular to the first surface. The light guide plate includes a light receiving portion which receives the light; a light guiding path which guides the light in the first direction; and an emitting portion which emits the light by reflecting the guided light towards the first surface in the third direction. The emitting portion includes a plurality of V-shaped grooves extending on the second surface in a second direction crossing the first direction. Each V-shaped groove extends in the first direction and is formed so as to be deepest in the center in the second direction and become shallower as a distance from the center increases.