Light Guide Plate Concave-Convex Edge Structure
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Solution Overview
Problem
Conventional light guide plates in display devices often suffer from optical degradation due to their shape, leading to issues like bright lines and dark bands, which existing solutions like optical dots cannot fully address, especially when the shape is non-rectangular or has smooth edges that cause light to be reflected in undesirable ways.
Innovation Solution
A light guide plate with a concave-convex structure on its side surfaces that refracts and reflects light, preventing bright lines and dark regions by altering the reflection angle and ensuring uniform brightness, thereby improving optical conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a smooth edge is used in the light guide plate manufacturing process, then manufacturing is easier, but light reflection creates bright lines and dark bands that degrade optical conditions
Solution Approach 1:
The patent applies local quality by introducing a concave-convex structure specifically at the edge region of the light guide plate, while maintaining a smooth surface in the bulk area. This localized structural modification targets the specific problem of light reflection at edges without compromising the ease of manufacturing the overall plate structure.
Solution Approach 2:
The patent employs curvature by forming a concave-convex structure at the edge of the light guide plate. This curved surface modifies the light reflection path, converting the harmful specular reflection that creates bright lines into diffuse reflection, thereby eliminating the optical degradation while maintaining manufacturing feasibility.
2Adaptability or versatility
If the light guide plate has a non-rectangular shape to match display device requirements, then adaptability improves, but optical conditions deteriorate due to edge reflection
Solution Approach 1:
The patent maintains the non-rectangular shape of the light guide plate to match various display device requirements, while simultaneously introducing a concave-convex structure specifically at the edge regions. This localized structural addition allows the plate to adapt to different shapes without the edges causing optical degradation.
Solution Approach 2:
The patent converts the harmful effect of edge reflection into a beneficial outcome by designing the concave-convex structure at the edges. This structure intentionally modifies the reflection behavior to diffuse light, transforming the potential source of bright lines and dark bands into a mechanism that promotes uniform light distribution.
3Illumination intensity
If optical dots are added to low brightness regions to increase brightness, then brightness uniformity improves, but the solution cannot address edge reflection problems
Solution Approach 1:
The patent segments the light guide plate into different functional regions: the bulk area maintains a smooth surface for easy manufacturing, while the edge regions feature concave-convex structures to control light reflection. This segmentation allows the solution to simultaneously address both brightness uniformity and edge reflection issues that cannot be solved by optical dots alone.
Solution Approach 2:
The patent introduces a new dimension of solution by adding a vertical concave-convex structure at the edges, rather than relying solely on horizontal optical dots on the surface. This three-dimensional structural modification at the edges provides an additional mechanism to control light paths, enabling simultaneous improvement of brightness uniformity and elimination of edge reflection artifacts.
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 concave-convex structure on the light guide plate effectively reduces brightness at edges and prevents light from focusing, resulting in improved optical performance by minimizing light and dark contrasts, enhancing the visual experience.
Implementation Method 1
the light irradiates out from the concave-convex structure due to refraction
Implementation Method 2
be reflected back to the light guide plate by the concave-convex structure
Data Source
AI summary
A light emitting device includes a light guide plate and a light source. The light guide plate has a first surface, a second surface that is opposite to the first surface, at least one third surface, and a light incident surface. The third surface and the light incident surface are between the first and second surfaces. The third surface is adjacent to the light incident surface and has a concave-convex structure. The light source is located on the light incident surface. When the light source emits light, the light of the light source enters the light guide plate and transmits to the concave-convex structure, such that the light irradiates out from the concave-convex structure due to refraction, and is reflected back to the light guide plate by the concave-convex structure.