Porous Rubbing Roller with Liquid Jet for LCD Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large-sized LCD devices face issues with non-uniform rubbing pressure and static electricity, leading to deteriorated display quality and particle adsorption during the alignment process.
Innovation Solution
An apparatus and method that incorporates a rotating rubbing roller with a liquid jet to maintain uniform pressure and prevent particle adsorption, using a conductive adhesive and jetting liquid such as water or isopropylalcohol to fill the roller's bends and reduce static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional rubbing roller is used for large-sized LCD devices, then the rubbing process can be performed, but non-uniform rubbing pressure occurs leading to deteriorated display quality
Solution Approach 1:
The rubbing roller is designed with multiple holes penetrating through its length, allowing liquid to be injected into the roller body. This porous structure enables the liquid to fill bends and gaps in the roller, ensuring uniform pressure distribution across the rubbing surface and eliminating non-uniform rubbing pressure that deteriorates display quality.
Solution Approach 2:
A liquid injection system is integrated with the rubbing roller, allowing liquid to be supplied through the holes in the roller. The liquid fills the roller's bends and gaps, maintaining uniform pressure during rubbing and preventing display quality deterioration caused by pressure non-uniformity.
2Manufacturing precision
If friction occurs during rubbing, then alignment layer rubbing is achieved, but static electricity is generated causing particle adsorption
Solution Approach 1:
Liquid is introduced as an intermediary substance between the rubbing roller and the alignment layer. This liquid reduces friction and prevents static electricity generation during rubbing, thereby preventing particle adsorption while maintaining alignment uniformity.
Solution Approach 2:
The introduction of liquid changes the friction parameters during rubbing, reducing static electricity generation. This parameter change eliminates particle adsorption caused by static electricity while preserving the alignment layer rubbing effectiveness.
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
Ensures uniform alignment layer rubbing across the entire surface, preventing defects from uneven pressure and particle adsorption, while reducing static electricity and maintaining display quality.
Implementation Method 1
a liquid jet to jet liquid when the alignment layer is rubbed by the rubbing means
Implementation Method 2
the rubbing cloth adhered to the outer circumference of the roller contacts the surface of the alignment layer so that the surface of the alignment layer is rubbed with the rubbing cloth
Data Source
AI summary
An apparatus and method for rubbing an alignment layer of an LCD device is disclosed. The alignment layer is rubbed over an entire surface of a substrate at uniform pressure and dust or particle is not adsorbed into the alignment layer during rubbing process. The apparatus for rubbing an alignment layer of an LCD device includes a rubbing means to rub the alignment layer while the rubbing means is rotated along one direction to contact a surface of the alignment layer formed on a substrate, and a liquid jet to jet liquid when the alignment layer is rubbed by the rubbing means.