Laminated Body Humidity Dimensional Stability
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Solution Overview
Problem
In stereoscopic image display devices, the dimensional change of cellulose acylate films due to humidity causes positional deviations and increased crosstalk, degrading display quality and reducing productivity, as existing solutions either increase costs or require multiple facilities for varying products.
Innovation Solution
A laminated body with a patterned phase difference film and a stiff glass body attached through a first attaching layer, which reduces dimensional change due to humidity, and a polarization plate with a polarizer attached through a second attaching layer with a lower adhering force, minimizing positional deviations and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cellulose acylate film is used as the supporter for the patterned optical anisotropic layer, then the manufacturing cost is reduced and handling properties are improved, but the film undergoes dimensional change due to moisture absorption at high temperature and high humidity, causing positional deviation and increased crosstalk
Solution Approach 1:
The patent uses a composite structure consisting of a cellulose acylate film (supporter) combined with a patterned optical anisotropic layer. The cellulose acylate film provides ease of manufacture and handling, while the optical anisotropic layer provides the necessary optical functionality. This composite approach allows each layer to contribute its strengths while mitigating the weaknesses of individual materials.
Solution Approach 2:
The patent specifies precise parameters for the cellulose acylate film, including thickness (10-50 μm) and moisture absorption characteristics. By controlling these parameters, the patent optimizes the balance between flexibility (for handling) and dimensional stability (for preventing positional deviation). The film is designed to have controlled moisture absorption properties that minimize dimensional change while maintaining manufacturability.
2Device complexity
If the patterned optical anisotropic layer is directly attached to the display panel without a stable supporter, then the structure is simplified, but positional deviation occurs due to humidity-induced dimensional change, degrading display quality and reducing yield
Solution Approach 1:
The cellulose acylate film serves as an intermediary layer between the display panel and the patterned optical anisotropic layer. This intermediary supporter provides a stable base that prevents direct contact between the optical layer and the display panel, thereby preventing positional deviation caused by humidity. The intermediary layer absorbs environmental variations before they affect the critical optical patterns, maintaining manufacturing precision.
3Reliability
If a stiff body is attached to the patterned optical anisotropic layer to reduce dimensional change, then positional deviation is reduced and crosstalk decreases, but the device complexity increases
Solution Approach 1:
The patent addresses dimensional instability not by adding complexity in the same dimension, but by introducing a new dimensional approach - using a very thin film (10-50 μm) that provides dimensional stability through its inherent properties rather than through thickness. This thin-film approach in the thickness dimension achieves stability without adding bulk or structural complexity in the planar dimensions.
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 reduces crosstalk and improves yield by minimizing dimensional changes in the laminated body, maintaining display quality across varying humidity conditions without increasing costs or requiring multiple facilities.
Implementation Method 1
a stiff body attached to a surface of the patterned optical anisotropic layer through a first attaching layer
Implementation Method 2
when a filmed cellulose acylate film is aged at a high temperature and a high humidity, there is a case in which the dimensions change due to the absorption of moisture
Implementation Method 3
an optical member is required to turn an image for the right eye and an image for the left eye into, for example, circularly-polarized images in mutually opposite directions
Data Source
AI summary
Provided are a laminated body which is made to extend and contract to a reduced extent due to humidity so as to reduce the number of the occurrence of crosstalk, a polarization plate having the same, a stereoscopic image display device and a stereoscopic image display system. A laminated body includes a patterned phase difference film having a supporter film and a patterned optical anisotropic layer in which a first phase difference region and a second phase difference region having mutually different in-plane slow axis directions and/or phase differences are disposed in a predetermined pattern on the supporter film, and a stiff body attached to a surface of the patterned optical anisotropic layer through a first attaching layer.