Light Guide Plate Prism Microstructure Edge Leakage
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Solution Overview
Problem
Conventional light guide plates with optical microstructures suffer from luminance nonuniformity and edge leakage, resulting in low luminance and inefficient light distribution.
Innovation Solution
A light guide plate with a prism component and optical microstructure featuring specific angles between inclined surfaces, including first, second, and third light guiding units, disposed on the board body's surfaces to enhance light guidance and distribution, replacing conventional structures like V-cut and R-cut designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional optical microstructures (hemisphere, V-cut, R-cut) are used, then the light guide plate can guide light, but luminance nonuniformity and edge leakage occur
Solution Approach 1:
The optical microstructure is divided into multiple light guiding units (first, second, and third units) with different geometric configurations. Each unit type serves specific functions: first units with 45-60 degree angles provide primary light guidance, second units with 10-60 degree angles control edge light extraction, and third units with 90 degree angles enhance uniformity. This segmentation allows independent optimization of each unit's function to achieve overall luminance uniformity while preventing edge leakage.
2Illumination intensity
If conventional optical microstructures are used, then light guidance is achieved, but luminance increases are limited
Solution Approach 1:
Multiple light guiding units with different functions are merged into a single integrated optical microstructure on the light guide plate. The first, second, and third light guiding units are combined in specific spatial arrangements, creating a composite structure that achieves enhanced luminance (up to 140% increase) while maintaining manufacturability through unified fabrication processes.
3Illumination intensity
If conventional optical microstructures are used, then light extraction occurs, but edge leakage problems persist
Solution Approach 1:
Different regions of the optical microstructure are assigned different geometric properties tailored to local requirements. Second light guiding units with 10-60 degree angles are positioned at specific locations to control edge light extraction, while first units with 45-60 degree angles handle central regions. This local differentiation ensures efficient light extraction throughout the plate while preventing harmful edge leakage through targeted geometric design at critical locations.
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 significantly increases luminance and uniformity, achieving up to 140% greater luminance compared to conventional designs while preventing edge leakage and luminance nonuniformity, by effectively guiding and diffusing light through the use of polymers like PMMA, PET, and PC.
Implementation Method 1
The optical microstructure can be adapted to destroy total internal reflection of the light guide plate to guide the beam transmitted through the light emitting surface
Implementation Method 2
A first angle is formed between two inclined surfaces of the first light guiding unit, and the first angle is substantially between 45 ̃60 degrees. The second light guiding units are symmetrically disposed on opposite sides of the first light guiding unit.
Data Source
AI summary
A light guide plate disclosed in the present disclosure includes a board body, a prism component and at least one optical microstructure. The prism component is disposed on at least one surface of the board body. The at least one optical microstructure is disposed on a top end of the prism component. The optical microstructure includes a first light guiding unit and at least two second light guiding units. A first angle is formed between two inclined surfaces of the first light guiding unit, and the first angle is substantially between 45˜60 degrees. The second light guiding units are symmetrically disposed on opposite sides of the first light guiding unit. A second angle is formed between an inclined surface and a bottom surface of each second light guiding unit, and the second angle is substantially between 10˜60 degrees.