Light Guide Plate Microstructures for 3D Display Cross-Talking
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Solution Overview
Problem
Conventional light guide plates with microstructures suffer from light divergence and increased cross-talking between sections, particularly in single short edge light incidence, which degrades 3D displaying performance.
Innovation Solution
A light guide plate with upper and lower microstructures comprising periodically juxtaposed strip-like units forming prisms, where the upper microstructures are of circular arc or U-shape and the lower microstructures are of circular arc or wavy shape, arranged parallel to the light propagation direction to enhance collimation and reduce cross-talking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If upper microstructures are formed on the light guide plate to eliminate total reflection, then light extraction efficiency is improved, but light divergence increases causing severe cross-talking between sections
Solution Approach 1:
The light guide plate is divided into multiple sections with independent microstructure arrangements. Each section has its own microstructure pattern that confines light to that specific section, preventing light from one section from interfering with adjacent sections. This segmentation approach directly addresses the cross-talking problem while maintaining effective light extraction in each section.
Solution Approach 2:
Different microstructure patterns are applied to different regions of the light guide plate. The microstructures are specifically designed and positioned in each section to optimize light extraction locally while maintaining section isolation. This local quality approach allows each section to have optimized light extraction without causing cross-talking to adjacent sections.
2Device complexity
If single short edge light incidence is used to simplify the backlight structure, then device complexity is reduced, but light divergence becomes more severe at remote sides
Solution Approach 1:
The patent introduces a vertical dimension to light control by forming microstructures on the light guide plate surface. These microstructures manipulate light in the vertical dimension (perpendicular to the light propagation direction) to improve collimation and reduce divergence. This dimensional approach allows the simple single short edge light incidence structure to achieve better light control without adding complex optical components.
Solution Approach 2:
The microstructures formed on the light guide plate have curved surfaces that refract and redirect light rays. The curved geometry of the microstructures helps to converge diverging light rays and improve collimation, particularly at remote sides of the light guide plate. This curvature-based approach maintains the simplicity of the single short edge light incidence while correcting light shape degradation.
3Ease of manufacture
If conventional flat light guide plate is used, then manufacturing is simple, but light shape diverges significantly with propagation distance
Solution Approach 1:
The patent replaces complex mechanical optical systems (such as multiple lenses or prisms) with microstructure-based optical control. The microstructures are formed directly on the light guide plate surface using conventional manufacturing techniques, eliminating the need for additional mechanical optical components. This substitution maintains ease of manufacture while achieving superior light shape control through the microstructure-induced refraction and collimation effects.
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 improved collimation and convergence of light within sections significantly reduce cross-talking between sections, enhancing 3D displaying performance by minimizing light divergence and brightness distribution issues.
Implementation Method 1
The upper and lower micro-structures each comprise a plurality of periodically and successively juxtaposed strip-like units. Each of the strip-like units forms a prism... so as to improve collimation of light after the light enters the light guide plate
Implementation Method 2
the geometric variation on the upper surface of the light guide plate is useful to eliminate the conditions for occurrence of total reflection
Data Source
AI summary
The present invention provides a light guide plate and a backlight module using the light guide plate. The light guide plate has an upper surface forming upper micro-structures and a lower surface forming lower micro-structures. The upper and lower micro-structures are set parallel to propagation direction of the light that emits from a backlight source traveling within the light guide plate. The upper and lower micro-structures each include a plurality of periodically and successively juxtaposed strip-like units. Each of the strip-like units forms a prism. The strip-like units of the upper and lower micro-structures are juxtaposed in the same direction. With the combination and arrangement of the upper micro-structures and lower micro-structures, collimation of light is improved after the light from an LED light source enters the light guide plate so as to improve convergence of the light inside a section.