Multifunctional Optical Sheet for LCD Light Concentration
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices suffer from light efficiency and viewing angle issues due to side lobes in backlight units, which increase manufacturing costs and reduce process efficiency.
Innovation Solution
A multifunctional optical sheet with a diffusing layer, a light-concentrating layer featuring alternating peaks and valleys, and a reflection layer between the substrate and light-concentrating layer, which redirects light to minimize side lobes and enhance light concentration and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light-concentrating sheet with prism patterns is used, then light concentration towards the liquid crystal panel is improved, but side lobes are generated causing light leakage and reduced viewing angle properties
Solution Approach 1:
The light-concentrating sheet is divided into multiple regions with different prism patterns. Specifically, a first region has prisms oriented to concentrate light toward the liquid crystal panel, while a second region has prisms oriented to redirect side lobe light back toward the panel. This segmentation allows different parts of the sheet to perform different optical functions, eliminating side lobes while maintaining light concentration.
Solution Approach 2:
Different regions of the light-concentrating sheet have locally optimized prism characteristics. The first region uses prisms with specific orientation and geometry for primary light concentration, while the second region uses prisms with different orientation to target side lobe suppression. This local quality approach allows each region to address specific optical issues at its location.
2Adaptability or versatility
If multiple separate optical sheets (diffuser sheet and light-concentrating sheet) are used, then light diffusion and concentration functions are achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The diffuser sheet and light-concentrating sheet are merged into a single integrated optical sheet. The diffuser portion contains diffusion particles for light scattering, while the light-concentrating portion contains prism patterns for light concentration. By combining these previously separate components into one sheet, the invention reduces device complexity and manufacturing cost while maintaining all necessary optical functions.
Solution Approach 2:
The integrated optical sheet performs multiple functions simultaneously: it diffuses light through the diffuser portion, concentrates light toward the liquid crystal panel through the light-concentrating portion, and eliminates side lobes through the specifically oriented prisms. This multi-functionality in a single component replaces what previously required multiple separate optical sheets.
3Ease of manufacture
If conventional optical sheets are used, then basic light diffusion is achieved, but light efficiency and viewing angle properties are reduced due to side lobe light leakage
Solution Approach 1:
The invention converts the harmful side lobe light leakage into a beneficial effect. Instead of allowing side lobe light to escape and reduce efficiency, the second region's prisms are oriented to redirect this previously wasted light back toward the liquid crystal panel. This transforms the harmful side lobes into useful light contribution, improving overall light efficiency while maintaining manufacturing simplicity.
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 improves light efficiency and viewing angle properties, resulting in uniform brightness and high-quality images while simplifying manufacturing processes and reducing costs.
Implementation Method 1
a reflection layer between the substrate and the light-concentrating layer, which redirects light
Data Source
AI summary
A multifunctional optical sheet for a liquid crystal display device includes a substrate diffusing incident light; a light-concentrating layer on the substrate and including a plurality of patterns that arranged to form alternating peaks and valleys; and reflection patterns between the substrate and the light-concentrating layer corresponding to the valleys of the light concentrating layer.