Light Guide Plate Prism Microstructures Viewing Angle Brightness
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Solution Overview
Problem
Conventional light guide plates for LCD backlight modules face challenges in achieving both high light emitting efficiency and wide viewing angles, often compromising on one aspect due to limitations in fabrication techniques such as stencil printing, laser machining, or the 'Double V' method.
Innovation Solution
A light guide plate with prism microstructures on both surfaces, featuring first and second prism microstructures with different top angles on the light emitting surface and varying heights/depths on the bottom surface, optimized to enhance light emitting efficiency and viewing angles by distributing microstructures accordingly across central and peripheral areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If stencil printing or laser machining is used to form light diffusion structures, then viewing angle is improved, but brightness is deficient
Solution Approach 1:
The patent applies local quality by forming different types of microstructures (prism structures with varying apex angles) in different regions of the light guide plate. Specifically, the first region contains prism structures with a first apex angle while the second region contains prism structures with a second apex angle different from the first, allowing each region to be optimized for its specific function (light extraction vs. light diffusion) while maintaining overall system performance.
2Illumination intensity
If 'Double V' technique is used to form light diffusion structures, then brightness is improved and fabrication cost is reduced, but viewing angle is narrowed
Solution Approach 1:
The patent divides the light guide plate into multiple regions with different microstructure characteristics. The first region has prism structures optimized for light extraction with specific apex angles, while the second region has different prism structures optimized for light diffusion. This regional differentiation allows the plate to achieve high brightness through effective light extraction while maintaining wide viewing angles through proper light diffusion in specific areas.
Solution Approach 2:
The light guide plate is segmented into distinct functional regions: a first region with specific prism microstructures for light extraction and a second region with different prism microstructures for light diffusion. This segmentation allows each region to perform its specialized function optimally, resolving the contradiction between brightness enhancement and viewing angle maintenance.
3Ease of operation
If prism microstructures with larger top angles are disposed in certain areas, then viewing angle is improved, but light emitting efficiency is reduced
Solution Approach 1:
The patent optimizes light emitting efficiency by strategically placing prism structures with different apex angles in different regions. The first region contains prism structures with apex angles optimized for light extraction efficiency, while the second region contains prism structures with different apex angles optimized for light diffusion and viewing angle. This spatial differentiation of microstructure parameters allows each region to excel at its primary function without compromising the other.
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 provides improved light emitting efficiency and wider viewing angles, resulting in a better backlight source that enhances LCD display quality by balancing light distribution and reducing boundary effects.
Implementation Method 1
prism microstructures are respectively formed on the light emitting surface and the bottom surface, wherein the prism microstructures on the light emitting surface includes a plurality of first prism microstructures and a plurality of second prism microstructures... A top angle θ2 of each of the second prism microstructures is greater than a top angle θ1 of each of the first prism microstructures
Implementation Method 2
prism microstructures are respectively formed on the light emitting surface and the bottom surface... so as to achieve light mixture
Data Source
AI summary
A light guide plate including a body and a plurality of prism microstructures is provided. The body has a bottom surface, a light emitting surface opposite to the bottom surface, and a plurality of side surfaces. The light emitting surface has a central area and at least one peripheral area outside the central area. The prism microstructures are disposed on the light emitting surface and the bottom surface. The prism microstructure disposed on the light emitting surface includes a plurality of first prism microstructures in the central area and a plurality of second prism microstructures in the peripheral area. A top angle θ2 of the second prism microstructure is greater than a top angle θ1 of the first prism microstructure. A backlight module including the above-mentioned light guide plate is also provided.