Liquid Crystal Display Films for Moisture-Resistant Organic Semiconductors
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Solution Overview
Problem
Organic semiconductors in liquid crystal display (LCD) devices are sensitive to moisture, leading to degradation under extreme conditions such as high temperatures, which existing technologies have not adequately addressed.
Innovation Solution
Incorporating oxygen-permeable, self-supporting plastic films with a thickness of at least 185 microns between polarising filter components and a liquid crystal cell, and using pre-prepared adhesive films with controlled oxygen transmission rates to create a barrier against moisture ingress while allowing molecular oxygen diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive films are used to bond polarising filter components to the liquid crystal cell, then assembly is simple, but moisture ingress occurs leading to degradation of organic semiconductors under high temperature conditions
Solution Approach 1:
The patent employs a multi-layer film structure comprising a moisture barrier layer and an oxygen-permeable adhesive layer. The moisture barrier layer acts as a flexible shell that prevents moisture ingress to the organic semiconductor, while the oxygen-permeable adhesive layer allows oxygen diffusion. This composite film structure resolves the contradiction by providing both moisture protection and oxygen permeability, preventing semiconductor degradation under high temperature conditions.
Solution Approach 2:
The invention uses a composite material structure combining a moisture barrier layer (with low moisture transmission rate) and an oxygen-permeable adhesive layer (with high oxygen transmission rate). This composite approach allows the system to simultaneously achieve moisture blocking and oxygen permeability, which cannot be accomplished with conventional single-material adhesive films. The composite structure directly addresses the technical contradiction by providing differentiated protection against different harmful factors.
2Object-affected harmful factors
If a moisture barrier film with low oxygen transmission rate is used, then moisture protection is improved, but oxygen diffusion to organic semiconductors is restricted
Solution Approach 1:
The protective film is segmented into two distinct functional layers: a moisture barrier layer that blocks moisture transmission, and an oxygen-permeable adhesive layer that allows oxygen diffusion. By dividing the protective function into separate layers, each layer can be optimized for its specific purpose without compromising the other function. This segmentation resolves the contradiction between moisture protection and oxygen diffusion capability.
Solution Approach 2:
Different regions of the film structure have different properties: the moisture barrier layer has low oxygen transmission rate for moisture protection, while the oxygen-permeable adhesive layer has high oxygen transmission rate for oxygen diffusion. This local differentiation of material properties allows the system to simultaneously achieve both moisture protection and oxygen permeability, resolving the technical contradiction.
3Object-affected harmful factors
If thick adhesive films are used to prevent moisture ingress, then moisture barrier performance is improved, but oxygen transmission capability is reduced
Solution Approach 1:
The invention uses a multi-layer film structure where the moisture barrier layer can be made thick to provide excellent moisture protection, while the oxygen-permeable adhesive layer maintains high oxygen transmission. The thin oxygen-permeable layer does not significantly impede oxygen diffusion even when the moisture barrier layer is thick, thus resolving the contradiction between moisture barrier performance and oxygen transmission rate.
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 method significantly reduces degradation of organic semiconductors in LCD devices under high temperatures, maintaining display performance and stability over extended periods.
Implementation Method 1
allowing molecular oxygen diffusion
Implementation Method 2
one or more pre-prepared, oxygenated oxygen-permeable films between a surface adhesive of a pre-prepared first polarising filter component and a control component of a liquid crystal cell
Data Source
AI summary
A display device including a liquid crystal cell having liquid crystal material contained between a control component having at least an organic semiconductor layer supported on a first support film, and a counter component having a second support film. The device further includes a first polarising filter component on the opposite side of the control component to the liquid crystal material and a second polarising filter component on the opposite side of the counter component to the liquid crystal material. The device also includes one or more oxygen-permeable, self-supportable films having a total thickness of at least 185 microns between the first polarising filter component and the control component and/or between the second polarising filter component and the counter component.