Optical Plate with Multi-Layer Refractive Index Structure for LCD Brightness
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Solution Overview
Problem
Conventional liquid crystal display (LCD) back light assemblies require multiple light sources to achieve sufficient brightness, which increases power consumption and manufacturing costs, while also facing challenges in maintaining light efficiency and preventing abrasion of optical components.
Innovation Solution
The optical plate is designed with a supporting sheet and three optical layers, each with specific refractive indices and protruding portions, which are bonded using an adhesive to enhance light focusing and prevent abrasion, allowing for improved brightness and reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are used in conventional LCD back light assemblies, then sufficient brightness can be achieved, but power consumption and manufacturing costs increase
Solution Approach 1:
The optical plate is divided into multiple optical layers (first optical layer, second optical layer, third optical layer) with different refractive indices, each segment contributing to light focusing. This segmentation allows a single light source to achieve sufficient brightness through the combined light-guiding effects of all layers, eliminating the need for multiple light sources and reducing power consumption.
Solution Approach 2:
The patent employs composite optical structures with different refractive indices (first optical layer: 1.43-1.54, second optical layer: 1.58-1.62, third optical layer: 1.43-1.54) to enhance light focusing efficiency. This composite material approach allows a single light source to produce sufficient brightness through the synergistic light-guiding effects, reducing the number of light sources needed and thereby lowering power consumption.
2Illumination intensity
If multiple light sources are used in conventional LCD back light assemblies, then sufficient brightness can be achieved, but manufacturing costs increase
Solution Approach 1:
The optical plate is divided into multiple optical layers (first optical layer, second optical layer, third optical layer) with different refractive indices, each segment contributing to light focusing. This segmentation allows a single light source to achieve sufficient brightness through the combined light-guiding effects of all layers, eliminating the need for multiple light sources and reducing manufacturing costs.
Solution Approach 2:
The patent employs composite optical structures with different refractive indices (first optical layer: 1.43-1.54, second optical layer: 1.58-1.62, third optical layer: 1.43-1.54) to enhance light focusing efficiency. This composite material approach allows a single light source to produce sufficient brightness through the synergistic light-guiding effects, reducing the number of light sources needed and thereby lowering manufacturing costs.
3Illumination intensity
If protruding portions are used in optical layers to enhance light focusing, then brightness is improved, but abrasion of optical components occurs
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the optical layers and the supporting sheet. This adhesive layer protects the protruding portions from direct contact and abrasion while maintaining the light-guiding functionality. The adhesive acts as a mediator that preserves both the optical performance and mechanical durability of the protruding portions.
Solution Approach 2:
The adhesive layer functions as a protective thin film that covers and protects the protruding portions of the optical layers. This flexible protective layer prevents abrasion and mechanical damage to the optical components while allowing the light-guiding effect to continue uninterrupted, thus maintaining both brightness and reliability.
4Reliability
If adhesive is used to bond optical layers, then abrasion is prevented, but possible defects such as bubbles may occur
Solution Approach 1:
The patent extracts and eliminates the adhesive layer from the structure, bonding the optical layers directly to the supporting sheet without any intermediate adhesive material. This extraction removes the source of potential defects such as bubbles while maintaining the protective function against abrasion through direct bonding, thus achieving both abrasion prevention and manufacturing precision.
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 plate achieves enhanced brightness and reduced abrasion, while simplifying the manufacturing process, resulting in a more efficient and cost-effective display apparatus with improved light focusing efficiency.
Implementation Method 1
The second optical layer is characterized as having a refractive index that is higher than the refractive index of the first optical layer. The third optical layer is characterized as having a refractive index that is lower than the refractive index of the second optical layer.
Data Source
AI summary
A display apparatus includes a light source, a display panel and an optical plate between the light source and the display panel. The optical plate includes a supporting sheet, a first, a second and a third optical layer. The first optical layer is disposed on a bottom surface of the supporting sheet and has a plurality of first protruding portions on a bottom surface of the first optical layer and has a first refractive index. The second optical layer is disposed on the bottom surface of the first optical layer and covers the first protruding portions. The second optical layer has a second refractive index larger than the first refractive index. The third optical layer is disposed on a top surface of the supporting sheet and has a plurality of second protruding portions on a top surface and has a third refractive index smaller than the second refractive index.