Liquid Crystal Display Device with Segmented Adhesive Layers
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Solution Overview
Problem
Existing liquid crystal display devices with liquid crystal capsules face issues such as deterioration of the liquid crystal layer and the formation of bubbles due to adhesive materials, leading to non-uniform distribution of liquid crystal capsules and increased fabrication costs, especially during rework processes.
Innovation Solution
The implementation of a liquid crystal display device with a substrate having thin film transistors, a liquid crystal layer including liquid crystal capsules and a binder, an auxiliary adhesive layer, and an optical film, along with a specific adhesive and polarizing plate arrangement to prevent bubble formation and layer deterioration, while maintaining uniform thickness and reducing rework-related costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive material is applied directly to the liquid crystal layer, then bonding strength is improved, but liquid crystal layer deterioration and non-uniform distribution occur
Solution Approach 1:
The adhesive system is segmented into two distinct layers: a lower adhesive layer positioned between the substrate and liquid crystal layer, and an upper adhesive layer positioned between the liquid crystal layer and the polarizing plate. This segmentation prevents direct contact between adhesive materials and the liquid crystal layer, eliminating deterioration and non-uniform distribution while maintaining bonding strength through the distributed adhesive layers.
2Ease of manufacture
If adhesive layer is placed directly on liquid crystal layer, then attachment is simplified, but bubble formation and rework difficulty increase
Solution Approach 1:
The liquid crystal layer serves as an intermediary protective layer between the adhesive materials and the liquid crystal capsules. By positioning adhesive layers on either side of the liquid crystal layer rather than directly on it, the system prevents bubble formation while maintaining simplified attachment through the multi-layer adhesive configuration.
3Length of stationary object
If liquid crystal layer is made thinner to reduce device thickness, then device profile is improved, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The invention changes the thickness parameters of individual layers (substrate, liquid crystal layer, adhesive layers, polarizing plate) to achieve an optimized overall device thickness. By adjusting these parameters systematically, the device achieves a thin profile while maintaining manufacturability and precise control over each layer's thickness during fabrication.
Data Source
AI summary
A liquid crystal display device includes: a substrate having first, second and third sub-pixels; a thin film transistor in each of the first, second and third sub-pixels on a front surface of the substrate; a pixel electrode and a common electrode in each of the first, second and third sub-pixels on the substrate, the pixel electrode and the common electrode spaced apart from each other; a liquid crystal layer on the pixel electrode and the common electrode, the liquid crystal layer including a liquid crystal capsule and a binder; an auxiliary adhesive layer on the liquid crystal layer; an optical film on the auxiliary adhesive layer; a first adhesive layer and a first polarizing plate sequentially on a rear surface of the substrate; and a second adhesive layer and a second polarizing plate sequentially on the optical film.