Optical Sheet With Elastic Recovery Layer
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Solution Overview
Problem
Optical sheets used in liquid crystal displays (LCDs) face issues with damage from external shocks and scratches, leading to reduced brightness and increased production costs due to the need for protective films and complex handling processes.
Innovation Solution
An optical sheet with a resin cured layer containing a slippable element, providing an elastic recovery rate of 85% or more, which prevents damage from external shocks and eliminates the need for protective films by ensuring slippability and reducing adhesion between sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective film is added to prevent damage, then reliability is improved, but device complexity and production cost increase
Solution Approach 1:
The optical sheet's surface itself provides damage resistance through high elastic recovery rate (85% or more), eliminating the need for separate protective films. The material self-protects by recovering from compression and shock without external protective layers.
Solution Approach 2:
The patent changes the elastic recovery rate parameter to 85% or higher, which fundamentally alters the surface's mechanical properties. This parameter change enables the surface to resist damage without additional protective structures, resolving the contradiction between reliability and complexity.
2Illumination intensity
If multiple prism films are laminated to increase brightness, then illumination intensity is improved, but the risk of structural damage increases due to contact between films
Solution Approach 1:
The high elastic recovery rate surface acts as an intermediary layer between stacked optical sheets. When sheets are laminated, the elastic surface absorbs compression forces and prevents direct contact damage between prism structures, enabling safe multi-layer configuration for enhanced brightness.
3Manufacturing precision
If the optical sheet is made rigid to maintain structure, then manufacturing precision is improved, but ease of operation deteriorates due to adhesion and handling difficulty
Solution Approach 1:
The optical sheet combines structural rigidity with dynamic elastic recovery. The surface can temporarily deform under handling stress then automatically recover to its original precise shape, providing both manufacturing precision and handling ease through this dynamic property.
Solution Approach 2:
By setting the elastic recovery rate parameter to 85% or higher, the patent creates a material that is both structurally accurate and easy to handle. This parameter change enables the sheet to slip rather than adhere during handling while maintaining structural precision.
4Illumination intensity
If power of backlight unit is increased to enlarge view angle, then illumination intensity is improved, but use of energy increases leading to heat loss
Solution Approach 1:
The patent replaces the mechanical approach of increasing backlight power with an optical-mechanical solution using elastic optical sheets. The sheets physically redirect and concentrate light through their elastic deformation and prism structures, achieving higher front brightness without increasing energy input.
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 optical sheet maintains brightness and structural integrity, reduces production costs, and enhances handling efficiency by preventing damage from external shocks and adhesion issues, thus improving workability and reliability.
Implementation Method 1
An elastic optical sheet which has an elastic recovery rate of 85% or more
Data Source
AI summary
The present invention relates to an optical sheet for use in a liquid crystal display. The optical sheet of the present invention allows for ease of handling, reduces defective proportions and manufacturing costs, improves throughput, and prevents the deterioration of luminance attributable to the damage of the optical sheet.