Liquid Alignment Device for LCD Panel Curing
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Solution Overview
Problem
Large size liquid crystal display panels experience sagging and curvature due to ultraviolet light absorption by color resist layers, leading to uneven liquid crystal orientation and pretilt angles, which affects display quality and increases manufacturing costs.
Innovation Solution
A liquid alignment device featuring a stage with a light guide plate and ultraviolet sources that converts point light into an area light source, allowing ultraviolet light to irradiate the first substrate without passing through the color resist layer, combined with clamping devices to maintain the panel horizontally, ensuring uniform liquid crystal alignment and preventing curvature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ultraviolet light is used to cure liquid crystal alignment from above through the first substrate, then liquid crystal pretilt angle can be achieved, but the color resist layer absorbs ultraviolet light reducing production rate and increasing manufacturing cost
Solution Approach 1:
The patent inverts the conventional curing direction by placing the curing light source below the second substrate instead of above the first substrate. This allows ultraviolet light to cure the liquid crystal alignment without passing through the color resist layer, eliminating light absorption issues and improving both alignment precision and production rate
Solution Approach 2:
The patent changes the spatial dimension of the curing approach from vertical irradiation through the first substrate to vertical irradiation from below through the second substrate. This dimensional reversal enables the curing light to reach the liquid crystal layer without encountering the color resist layer, resolving the contradiction between alignment quality and production efficiency
2Object-affected harmful factors
If the first substrate is placed on the upper place and the second substrate on the lower place for ultraviolet irradiation, then color resist layer protection is achieved, but the liquid crystal display panel sags and curves affecting display quality
Solution Approach 1:
The patent inverts the substrate arrangement and curing direction, placing the curing light source below the second substrate instead of above the first substrate. This reversal eliminates the need to position the first substrate above the second, preventing panel sagging and curvature while still achieving effective liquid crystal alignment curing
Solution Approach 2:
The patent introduces a transparent support structure as an intermediary between the curing light source and the liquid crystal layer. This support structure holds the panel in a flat position during curing, preventing sagging and curvature while allowing ultraviolet light to pass through and cure the alignment effectively
3Area of stationary object
If large size liquid crystal display panel is used, then display area is increased, but two ends of the panel sag and curve with maximum deformation at probe location
Solution Approach 1:
The patent applies preliminary support and positioning actions to the liquid crystal display panel before the curing process begins. The transparent support structure is placed underneath the panel to maintain its flatness, preventing sagging and curvature from occurring during the curing of large-sized panels
Solution Approach 2:
The patent introduces a transparent support structure as an intermediary element between the curing light source and the liquid crystal display panel. This support structure provides mechanical stability to large panels, preventing end sagging and curvature while allowing ultraviolet light to pass through for effective curing
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
Improves the efficiency of liquid alignment by preventing ultraviolet light absorption by the color resist layer, enhancing yield rates and reducing manufacturing costs by maintaining the panel horizontally and ensuring uniform liquid crystal orientation and pretilt angles.
Implementation Method 1
a curing light source configured to irradiate the first substrate along a direction from the first substrate to the second substrate to cure a pretilt angle of liquid crystal
Implementation Method 2
the light guide plate is configured to change an emission direction of ultraviolet light emitted by the ultraviolet sources such that the ultraviolet light irradiates the first substrate along the direction from the first substrate to the second substrate
Implementation Method 3
a probe configured to provide the first substrate with a curing voltage through an exposed electrode of the first substrate
Data Source
AI summary
The present invention provides a liquid alignment device including: a stage configured to carry a liquid crystal display panel, wherein in the liquid crystal display panel a first substrate is placed on the stage; a curing light source configured to irradiate the first substrate; a probe configured to provide the first substrate with a voltage. The present invention employs a color resist layer disposed in a second substrate of the liquid crystal display panel to solve the issue that during liquid alignment the second substrate must be disposed on a lower place and the first substrate must be disposed on an upper place to prevent efficiency of the liquid alignment.