Trapezoid Light Guide Plate for Uniform Luminance
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Solution Overview
Problem
Conventional light guide plates with V-shaped or R-shaped microstructures suffer from excessive light concentration and directivity, leading to brightness and darkness bands, hotspots, and surface damage due to friction and collisions, affecting their optical appearance and functionality.
Innovation Solution
A light guide plate featuring trapezoid-like structures with varying shapes, angles, heights, and arrangements on its surfaces to adjust light concentration and optical trends, along with a flat surface design to prevent damage from friction during transportation and manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If V-shaped or R-shaped microstructures are disposed on the light-emitting surfaces to mix light uniformly, then light mixing capability is improved, but light concentration becomes too strong and light directivity increases, causing brightness and darkness bands and hotspots
Solution Approach 1:
The patent changes the geometric parameters of the microstructures from V-shaped or R-shaped to trapezoid-like structures with specific width, height, and angle parameters. By optimizing these parameters (width ratio between 0.1-0.5, height ratio between 0.05-0.3, top angle between 30-150 degrees), the patent achieves better light mixing while reducing excessive light concentration and directivity, thereby eliminating brightness and darkness bands.
Solution Approach 2:
Instead of using sharp V-shaped or R-shaped structures that concentrate light, the patent inverts the approach by using trapezoid-like structures with flat tops and broader bases. This inverted geometry distributes light more evenly across the emission surface, reducing hotspots while maintaining effective light mixing capability.
2Stability of the object's composition
If V-shaped microstructures are used to mix light, then light distribution is improved, but the tip portions are likely to be scratched and collapsed due to collisions, affecting the function of the light guide plate
Solution Approach 1:
The patent applies beforehand cushioning by designing trapezoid-like structures with flat tops and broader bases instead of sharp V-shaped tips. This structural design anticipates potential mechanical damage during handling and transportation, as the flatter, more robust geometry is less susceptible to scratching and collapsing, thereby maintaining structural integrity and functional reliability.
Solution Approach 2:
The patent employs curved side surfaces in the trapezoid-like structures, transitioning from sharp angular edges to smoother, more rounded contours. This curvature reduces stress concentration points that would otherwise be vulnerable to mechanical damage, enhancing the structural resilience of the microstructures against scratching and collapse during handling.
3Stability of the object's composition
If conventional microstructures are used, then light mixing is achieved, but friction during transportation causes white dots or stains on the surface, affecting appearance and yield
Solution Approach 1:
The patent protects against friction damage beforehand by designing trapezoid-like structures with flat tops and broader surfaces. These geometries distribute contact forces more evenly during handling and transportation, reducing localized stress and friction that would otherwise cause white dots or stains on the surface, thereby preventing appearance defects and improving manufacturing yield.
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 trapezoid-like structures enhance luminance uniformity and value, reduce brightness bands, and improve the light guide plate's durability by minimizing damage from friction, resulting in improved optical performance and increased yield.
Implementation Method 1
Light provided by a light source enters the light guide plate from the light-incident surface and is emitted out from the light-emitting surface
Implementation Method 2
the second main surface is a reflecting surface
Data Source
AI summary
A light guide plate includes a main body and trapezoid-like structures. The main body includes a light-incident surface, a first main surface and a second main surface opposite to the first main surface. The trapezoid-like structures are disposed on at least one of the first main surface and the second main surface. The trapezoid-like structures extend along a direction from one side of the main body near the light-incident surface to the other side of the main body away from the light-incident surface. Each of the trapezoid-like structures has a width gradually increasing from one end of the trapezoid-like structure near the light-incident surface to the other end of the trapezoid-like structure away from the light-incident surface. Each of the trapezoid-like structures comprises a flat surface and two side surfaces, and the side surfaces are respectively connected to two sides of the flat surface.