Light Diffusion Control Layer for Orientation-Stable Reflective Displays
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Solution Overview
Problem
Reflective display bodies face issues with visibility deterioration due to varying light source positions, and existing light diffusion control layers fail to maintain optimal visibility when the up-down direction of display content is changed.
Innovation Solution
A light diffusion control member with a regular internal structure and a diffusion pressure sensitive adhesive layer containing light-diffusing fine particles, optimized to maintain uniform brightness and visibility across different orientations by satisfying specific luminance and standard deviation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a general light diffusion plate is incorporated into the display body to improve visibility, then light diffusion capability is enhanced, but light loss due to stray light or backscattering occurs which impairs image clarity
Solution Approach 1:
The light diffusion control layer is designed with a specific regular internal structure consisting of columnar bodies with tilted extension directions. This localized structural quality enables selective light diffusion - diffusing light within a predetermined incident angle range while maintaining image clarity, thereby resolving the contradiction between light diffusion capability and light loss
Solution Approach 2:
The patent optimizes specific parameters including the incident angle range (predetermined angle), the tilt angle of columnar bodies, and the refractive index differences between regions. By controlling these parameters, the light diffusion control layer achieves strong light diffusion within the target angle range while minimizing stray light and backscattering, thus reducing light loss
2Illumination intensity
If a light diffusion control layer is provided to improve visibility by diffusing reflected light, then visibility deterioration due to light source position is reduced, but the effect cannot be fully obtained when the up-down direction of display content is changed
Solution Approach 1:
The light diffusion control layer employs an asymmetric regular internal structure where columnar bodies are tilted at specific angles relative to the normal direction. This asymmetric structure creates different light diffusion characteristics for different incident angles, enabling the layer to maintain effective light diffusion across various display orientations while preserving visibility
Solution Approach 2:
The patent introduces a directional dimension to the light diffusion control by tilting columnar bodies at specific angles. This dimensional adjustment allows the light diffusion control layer to adapt to different display orientations (portrait/landscape) by controlling light diffusion in multiple angular directions, thereby improving adaptability to orientation changes
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
Ensures excellent visibility and uniform brightness regardless of the up-down direction of display content, effectively diffusing and reflecting light to prevent brightness variations.
Implementation Method 1
a light diffusion control layer having a regular internal structure which includes a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index
Implementation Method 2
a diffusion pressure sensitive adhesive layer which is laminated on one surface side of the light diffusion control layer and contains light-diffusing fine particles
Data Source
AI summary
A light diffusion control member includes a light diffusion control layer having a regular internal structure that includes a plurality of regions having a relatively high refractive index in a region having a relatively low refractive index, and a diffusion pressure sensitive adhesive layer containing light-diffusing fine particles. L1, L2, and L3 identified from reflected light measured for the light diffusion control member (1a, 1b) satisfy the following expressions: (1) L1>1.00; (2) 0.70≤L2≤1.00; and (3) L3<2.00.