Light Diffusing Member Hollow Portions Viewing Angle
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Solution Overview
Problem
Existing light diffusing members in liquid crystal display devices face issues with low adhesiveness between components, leading to separation and reduced light transmittance, and have manufacturing challenges that decrease productivity and viewing angle.
Innovation Solution
A light diffusing member with a base material featuring scattered light blocking sections and a thicker light transmissive material layer with hollow portions, where the refractive index difference and inclined interfaces enhance mechanical strength and viewing angle without compromising light transmittance, and a manufacturing method that includes forming these features to increase productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a light absorbing adhesive is provided between light diffusing ribs and a light transmissive shield to bond them, then the components are joined together, but the adhesiveness is low causing separation and the adhesive remains at contact surfaces reducing light transmittance
Solution Approach 1:
The patent removes the light absorbing adhesive from the optical path by forming hollow portions in the light transmissive material layer at the bonding locations. This extraction eliminates the adhesive's harmful effect on light transmittance while maintaining the bonding function through direct contact between the light diffusing member and light transmissive shield at these hollow portion regions.
Solution Approach 2:
The light transmissive material layer is designed with hollow portions (porous structure) at specific bonding locations. These hollow portions allow direct bonding between components without adhesive, eliminating the adhesive layer that would otherwise block light while maintaining structural integrity through the porous design.
2Adaptability or versatility
If light blocking sections are formed on a base material to increase viewing angle, then viewing angle is improved, but mechanical strength is reduced due to the scattered structure
Solution Approach 1:
The patent creates a composite structure where light blocking sections (made of light absorbing material) are integrated with a light transmissive material layer having hollow portions. This composite design allows the light blocking sections to provide viewing angle enhancement while the surrounding light transmissive material with hollow portions provides mechanical support, combining the benefits of both materials.
Solution Approach 2:
The hollow portions extend in the thickness direction of the light transmissive material layer, creating a three-dimensional structure. This vertical dimensionality provides additional mechanical support to the light blocking sections without compromising the viewing angle enhancement function, as the hollow portions act as reinforcing pillars.
3Manufacturing precision
If high precision joining is required between light diffusing layer and light blocking sheet to maintain alignment, then light transmittance is maintained, but processing time increases reducing productivity
Solution Approach 1:
The hollow portions in the light transmissive material layer serve a dual function: they provide structural support and act as self-aligning bonding locations. When the light diffusing member is placed on the base material, the hollow portions automatically position the bonding interfaces, eliminating the need for complex external alignment procedures and reducing processing time.
Solution Approach 2:
The hollow portions are pre-formed in the light transmissive material layer before the bonding step. This preliminary action creates predetermined bonding locations that guide the assembly process, ensuring proper alignment is achieved automatically during assembly without requiring additional precision adjustment steps.
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 provides a light diffusing member with improved mechanical strength, increased viewing angle, and high productivity, maintaining excellent display quality and light transmittance.
Implementation Method 1
a light transmissive material layer that is formed at the one surface of the base material, wherein a thickness of the light transmissive material layer is larger than a thickness of each light blocking section, wherein the light transmissive material layer has hollow portions in regions where the light blocking sections are formed
Data Source
AI summary
A light diffusing member includes a base material having a light transmitting property; a plurality of light blocking sections that are formed in a scattered manner at one surface of the base material; and a light transmissive material layer that is formed at the one surface of the base material. A thickness of the light transmissive material layer is larger than a thickness of each light blocking section. The light transmissive material layer has hollow portions in regions where the light blocking sections are formed. Each hollow portion has a shape in which a cross-section area when each hollow portion is cut at a plane that is parallel to the one surface of the base material is large on a side of the corresponding light blocking section and becomes gradually smaller with increasing distance from the corresponding light blocking section. A portion of the light transmissive material layer other than where the hollow portions are formed is a light transmitting section.