Light Guide Plate Inclined Surface Protrusions Brightness Homogenization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Side incident type light guide plates exhibit significant longitudinal and transverse brightness differences due to varying distances from the light incident surface, leading to uneven light emission, which existing methods fail to adequately address without increasing light source density.
Innovation Solution
A light guide plate design featuring a first and second light emitting surface connected by an inclined surface with protruding structures that partially reflect light, allowing it to be mixed and homogenized within the plate, reducing both longitudinal and transverse brightness differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pitch of light sources is reduced to increase distribution density, then transverse brightness difference is reduced, but longitudinal brightness difference remains and manufacturing cost increases
Solution Approach 1:
The patent transitions from a conventional planar light guide plate to a three-dimensional structure with an inclined surface. This dimensional change allows light to undergo multiple internal reflections and mixing paths, effectively reducing transverse brightness difference without increasing light source density. The inclined surface creates additional optical paths that homogenize light distribution across the display area.
Solution Approach 2:
The patent introduces a light mixing layer as an intermediary component between the light incident surface and the light emitting surface. This layer facilitates light mixing and homogenization through the inclined surface structure, acting as a mediator that decouples the light source arrangement from the final light distribution quality, thereby reducing transverse brightness difference without requiring denser light source placement.
2Illumination intensity
If discrete light sources are arranged along the light incident surface, then light emission is achieved, but longitudinal and transverse brightness differences occur
Solution Approach 1:
By introducing an inclined surface that creates three-dimensional optical paths, the patent enables light from discrete sources to be redistributed uniformly across the emitting surface. The inclined geometry transforms direct line-of-sight propagation into multiple reflection paths, achieving brightness uniformity without changing the discrete light source arrangement.
Solution Approach 2:
The inclined surface may incorporate curved or non-linear geometric features that optimize light reflection and mixing paths. These curved surfaces help distribute light more evenly by creating varied reflection angles and paths, thereby reducing both longitudinal and transverse brightness differences while maintaining discrete light source configuration.
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 reduces brightness differences by reflecting and mixing light within the plate, improving user experience by minimizing dazzling and enhancing viewing effects without increasing light source density.
Implementation Method 1
part of the light emitted from the inclined surface is reflected back to the light guide plate by the protruding structure and reflected back and forth between the bottom surface of the light guide plate and the inclined surface
Implementation Method 2
each sub-protruding structure comprises a sub-curved surface for partially reflecting the light emitted from the inclined surface
Data Source
AI summary
A light guide plate includes a first light emitting surface and a second light emitting surface. The first light emitting surface and the second light emitting surface are connected by an inclined surface. The first light emitting surface is connected to the light incident surface of the light guide plate and is higher than the second light emitting surface, and the inclined surface is provided with a protruding structure. According to the technical solutions in the embodiments of the present disclosure, part of the light projected onto the inclined surface is reflected back to the light guide plate by the protruding structure and reflected back and forth between the bottom surface of the light guide plate and the inclined surface to be sufficiently mixed and homogenized. A part of the homogenized light emits from the second light emitting surface to compensate for a longitudinal brightness difference. Another part of the homogenized light exits from the protruding structure on the inclined surface and the first light emitting surface, thereby reducing the transverse brightness difference. Thus, the poor user experience such as dazzling can be reduced and the viewing effect can be improved.