Optical Sheet Protruding Fibers Backlight Luminance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light diffusion sheets for liquid crystal display devices face a trade-off between light diffusibility and face luminance, where increasing light diffusibility to achieve uniform luminance reduces face luminance, and vice versa.
Innovation Solution
An optical sheet with a transparent substrate layer and an optical function layer featuring protruding fibers, which provides high directional diffusion and maintains both high light diffusibility and face luminance through strategic fiber density, refractive index, and adhesive application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the blended amount of resin beads is increased to enhance light diffusibility, then light diffusibility is improved, but face luminance is reduced
Solution Approach 1:
The invention changes the physical parameters of the optical layer by using hollow spherical beads with specific refractive indices (1.3-1.7) and controlled blending ratios (5-50 mass%). The hollow structure and refractive index control allow optimization of light diffusion while maintaining face luminance, resolving the trade-off between diffusibility and brightness
Solution Approach 2:
The invention creates a composite optical layer combining hollow spherical beads with a binder resin, forming a blended material that achieves both light diffusion and luminance maintenance. The composite structure allows the hollow beads to scatter light effectively while the binder maintains structural integrity and optical properties
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 achieves superior optical functions, enhancing luminance uniformity and light transmittance while preventing fiber detachment, thus improving the quality of liquid crystal display devices.
Implementation Method 1
The rays of light that has passed through one surface side of the substrate layer, and entered the optical function layer diffuses through reflection and refraction on the lateral face of the plurality of fibers
Implementation Method 2
The rays of light that has passed through one surface side of the substrate layer, and entered the optical function layer diffuses through reflection and refraction on the lateral face of the plurality of fibers
Implementation Method 3
The optical function layer preferably includes an adhesive portion joining the plurality of fibers to the substrate layer
Data Source
AI summary
Provided is an optical sheet capable of exhibiting superior optical function, and a high-quality backlight unit using the same. The optical sheet includes a transparent substrate layer, and an optical function layer having a plurality of fibers protruding from one surface side of the substrate layer. The optical function layer preferably includes an adhesive portion joining the plurality of fibers to the substrate layer. The adhesive portion is preferably laminated entirely on the one surface side of the substrate layer. The adhesive portion is preferably formed from acryl emulsion adhesives. The refractive index of the fiber is preferably no less than 1.3 and no greater than 1.8. The density of the fiber per unit area in the plane direction of the substrate layer is preferably no less than 100 fibers/cm2 and no greater than 5000 fibers/cm2.