Light Control Member with Enlarged Shielding Layer for Adhesiveness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing light diffusing members in liquid crystal display devices face issues with adhesiveness between the transparent substrate and the light diffusing portion, particularly when a large portion of the substrate is covered with a light shielding layer, leading to decreased bonding strength.
Innovation Solution
A light control member is designed with a light-transmissive substrate featuring a light diffusing portion and a light shielding layer, where the light diffusing portion has a larger incident end surface area than the emitting end surface, and the light shielding layer includes an enlarged portion with a larger sectional area, enhancing adhesiveness through an irregular structure on the contact surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a large portion of the transparent substrate is covered with the light shielding layer, then light control functionality is improved, but the bonded area between the transparent substrate and the light diffusing portion is reduced, decreasing adhesiveness
Solution Approach 1:
The light shielding layer is designed with an enlarged portion that extends in the thickness direction (Z-axis) beyond the substrate surface. This three-dimensional structure increases the bonding area between the light shielding layer and the light diffusing portion without increasing the planar footprint, thus maintaining light control functionality while improving adhesiveness through vertical dimension expansion.
Solution Approach 2:
The light shielding layer with enlarged portion is integrated within the light diffusing portion structure, where the enlarged portion extends into the thickness direction and bonds with the substrate. This nested configuration allows the light shielding layer to serve dual purposes: light control and enhanced bonding, resolving the contradiction between coverage area and adhesiveness.
2Use of energy by moving object
If the light diffusing portion has a large incident end surface area, then light utilization efficiency is improved, but the bonding area with the substrate is reduced, decreasing adhesiveness
Solution Approach 1:
The light diffusing portion is designed with a trapezoidal cross-section where the incident end surface area is larger than the emitting end surface area. The bonding area with the substrate is concentrated at the emitting end surface and the side surfaces, while the larger incident end surface captures more light. This dimensional configuration separates the light capture function (large incident surface) from the bonding function (concentrated at emitting end and sides), resolving the contradiction.
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
This configuration improves the adhesiveness between the substrate and the light diffusing portion, resulting in a more reliable light control member with enhanced peeling resistance and light utilization efficiency, while maintaining display characteristics.
Implementation Method 1
A portion of light which is vertically incident on the light diffusing member is totally reflected from a wall surface of the groove and is then emitted. Thereby, light emitted from the light diffusing member is diffused.
Implementation Method 2
radiating light from a second surface on a side opposite the first surface of the substrate, and developing the negative type photosensitive resin layer for which irradiation with light has been completed
Data Source
AI summary
A light control member includes a light-transmissive first substrate, a light diffusing portion which is defined on a first surface of the first substrate, and a light shielding layer which is defined in a first region other than a second region in which the light diffusing portion is formed on the first surface and includes a light emitting end surface in contact with the first substrate, and a light incident end surface opposite the light emitting end surface and having a first area larger than a second area of the light emitting end surface, and structured such that a height from the light incident end surface to the light emitting end surface is larger than a layer thickness of the light shielding layer.