Electric Field Alignment for LCD Panels Without Rubbing
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Solution Overview
Problem
The existing rubbing alignment method for liquid crystal displays suffers from light leakage due to non-uniform cloth arrangement and lack of physical contact between the rubbing cloth and the substrate, leading to non-uniform liquid crystal alignment.
Innovation Solution
A method and apparatus that utilize an electric or magnetic field to align the alignment material on a substrate without physical contact, allowing for uniform liquid crystal alignment by applying a field flux to determine the alignment direction, eliminating the need for physical contact and curing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rubbing alignment method is used with physical contact between rubbing cloth and substrate, then alignment direction can be established, but light leakage occurs due to non-uniform cloth arrangement and lack of physical contact
Solution Approach 1:
The patent replaces the mechanical rubbing system with an electric field-based alignment system. Instead of using a physical rubbing cloth that contacts the substrate, the invention applies an electric field through electrodes to align the liquid crystal molecules and alignment layer, eliminating the mechanical contact that causes non-uniform alignment and light leakage.
Solution Approach 2:
The patent introduces an electric field as an intermediary between the electrodes and the liquid crystal alignment layer. This electric field serves as a mediator that transfers alignment information without requiring physical contact, allowing uniform alignment to be achieved across the entire substrate surface simultaneously.
2Manufacturing precision
If rubbing alignment method is used, then alignment layer can be formed, but additional curing steps are required
Solution Approach 1:
The patent extracts and eliminates the curing step from the alignment layer formation process. By using electric field alignment instead of thermal rubbing, the method removes the need for high-temperature curing that is traditionally required to set the alignment layer, thereby reducing processing time and simplifying the manufacturing sequence.
Solution Approach 2:
The patent skips the curing step entirely by using electric field alignment. The alignment is achieved directly through the electric field action on the alignment layer molecules, allowing the process to rush through to completion without the time-consuming curing phase that would otherwise be necessary.
3Manufacturing precision
If rubbing alignment method is used, then alignment can be achieved, but flexible and heat-sensitive substrates cannot be used due to high temperature curing
Solution Approach 1:
The patent replaces the thermal-mechanical rubbing system with an electric field system, eliminating the high-temperature curing step that limits substrate material choices. This substitution enables the use of flexible plastics and other heat-sensitive materials that would decompose or deform under traditional curing temperatures.
Solution Approach 2:
The patent changes the operating parameters from high-temperature mechanical rubbing to low-temperature electric field alignment. By operating at lower temperatures through electric field application, the method expands the range of usable substrates to include flexible and heat-sensitive materials that cannot withstand traditional high-temperature processing.
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
This approach prevents light leakage by ensuring uniform liquid crystal alignment, allows the use of flexible and heat-sensitive substrates, and reduces processing time by eliminating the need for physical contact and additional curing steps.
Implementation Method 1
applying an electric or magnetic field to the alignment material to determine the alignment direction of the alignment material
Implementation Method 2
applying an electric or magnetic field to the alignment material to determine the alignment direction of the alignment material
Data Source
AI summary
A method for forming an alignment layer for a liquid crystal display includes preparing a substrate, applying an alignment material for initial alignment of a liquid crystal, and applying a field flux (e.g., an electric or magnetic field) to the alignment material to determine the alignment direction of the alignment material. Further disclosed is an apparatus for forming an alignment layer for a liquid crystal display. The apparatus comprises a substrate stage on which a substrate is mounted, and an electric or magnetic field generator installed at the periphery of the substrate stage. According to the method and the apparatus, since the alignment direction of an alignment material is determined by using an electric or magnetic field, no physical contact with a substrate is required and thus the problem of light leakage caused by rubbing alignment is solved.