Optical Sheet Laminate for Image Display Light Control
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Solution Overview
Problem
Conventional optical sheets face challenges in achieving a high light blocking effect while maintaining high light utilization efficiency and preventing interference fringes and scintillation, which are issues in existing light control films and optical sheets used in image display devices.
Innovation Solution
A laminate structure comprising a substrate layer and an optical function layer with light transmission and absorption parts arranged in a specific pattern, where the cross-sectional area of the light transmission parts to the total cross-sectional area of adjacent light transmission and absorption parts is between 78.2% and 88.5%, and a reflective polarizing plate is used to control light diffusion and reflection, ensuring optimal light blocking and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If light absorption parts are added to control light in a desired direction, then light blocking effect is improved, but light utilization efficiency deteriorates
Solution Approach 1:
The patent optimizes the width ratio parameter of light transmission parts to fall within 30-70%, and controls the thickness ratio of light absorption parts to be within 0-50% of light transmission part thickness. These parameter optimizations allow the optical sheet to achieve effective light blocking while minimizing light absorption losses, thereby resolving the contradiction between light blocking effect and light utilization efficiency.
Solution Approach 2:
The patent employs a composite structure combining light transmission parts (with refractive index 1.45-1.65) and light absorption parts (with refractive index 1.40-1.60) in a specific geometric arrangement. This composite design enables simultaneous achievement of light blocking function and maintained light utilization efficiency through optimized material selection and structural configuration.
2Object-generated harmful factors
If a rough surface is provided to prevent interference fringes, then interference fringes are eliminated, but light blocking effect deteriorates
Solution Approach 1:
The patent specifies precise geometric parameters: light transmission part width ratio of 30-70% and light absorption part thickness ratio of 0-50%. These parameter controls enable the optical sheet to achieve effective light blocking while maintaining smooth surface characteristics that prevent interference fringe generation, thus resolving the contradiction between eliminating interference fringes and maintaining light blocking effect.
3Object-affected harmful factors
If light transmission parts and absorption parts are arranged in stripe pattern, then light control is improved, but interference fringes and scintillation are generated
Solution Approach 1:
The patent optimizes the width ratio of light transmission parts to 30-70% and controls the thickness ratio of light absorption parts to be within 0-50% of light transmission parts. These parameter optimizations enable effective light control through stripe pattern arrangement while minimizing the generation of interference fringes and scintillation, resolving the contradiction between light control performance and visual quality.
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 effectively prevents interference fringes and scintillation while maintaining a high light blocking effect, ensuring efficient light utilization and improved image quality in image display devices.
Implementation Method 1
an optical function layer that is layered on one surface of the substrate layer, and has a plurality of light transmission parts which are arranged in a row along a surface of the substrate layer so as to be light-transmissive
Implementation Method 2
light absorption parts in a row, each of which is arranged between adjacent ones of the light transmission parts so as to be light-absorptive
Implementation Method 3
a reflective polarizing plate that is arranged on the optical function layer on a side opposite to the substrate layer
Data Source
AI summary
A laminate includes: a substrate layer; and an optical function layer that is layered on one surface of the substrate layer, and has a plurality of light transmission parts which are arranged in a row along a surface of the substrate layer so as to be light-transmissive, and light absorption parts in a row, each of which is arranged between adjacent ones of the light transmission parts so as to be light-absorptive, wherein on a cross section of the optical function layer in the layer thickness direction, a cross-sectional area of one of the light transmission parts to the total cross-sectional area of one of the light transmission parts and one of the light absorption parts which are adjacent to each other is 78.2% to 88.5%, and optical diffuse reflectances thereof satisfy predetermined values.