Air Sprayed Alignment Layers for LCD Viewing Angle and Transmissivity
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Solution Overview
Problem
Existing liquid crystal display (LCD) technologies face challenges in increasing viewing angle without decreasing transmissive rate, as features like slits or protrusions on electric field generating electrodes reduce pixel transmissivity.
Innovation Solution
A display panel manufacturing method involving the formation of alignment layers on substrates using air spraying techniques to create pretilted angles in liquid crystal molecules, without forming slit or protrusion patterns, thereby enhancing viewing angle and transmissive rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutting portions or protrusions are formed on electric field generating electrodes to increase viewing angle, then standard viewing angle is improved, but transmissive rate of pixel deteriorates
Solution Approach 1:
The patent replaces the mechanical/structural approach of forming cutting portions or protrusions on electrodes with a chemical/physical approach using alignment layers. The alignment layers are formed by spraying polymer materials with controlled pretilt angles in different directions for different sub-pixel areas, creating multi-domain effects without any physical modifications to the electrode structure, thus maintaining full light transmission.
Solution Approach 2:
The patent changes the parameters of the alignment layer formation process by controlling the spray direction and pretilt angle of polymer materials. By adjusting the spray direction (e.g., +45 degrees for red sub-pixel, -45 degrees for green sub-pixel) and pretilt angles, the patent creates different domain orientations in each sub-pixel area, achieving viewing angle enhancement through parameter control rather than structural modification.
2Manufacturing precision
If alignment layer is formed by conventional methods, then alignment is achieved, but scratches may occur during formation
Solution Approach 1:
The patent replaces conventional mechanical alignment methods (such as rubbing or contact-based processes) with a non-contact spray deposition method. The polymer material is sprayed onto the substrate to form the alignment layer, eliminating mechanical contact that would cause scratches while still achieving precise alignment control through spray direction and pretilt angle parameters.
Solution Approach 2:
The patent uses a polymer material as an intermediary substance that is sprayed to form the alignment layer. This intermediary layer provides the necessary alignment function without requiring direct mechanical interaction with the liquid crystal or substrate, thereby preventing scratches while maintaining alignment quality.
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 increases the transmissive rate and response rate of the LCD, allowing for more effective image display without compromising pixel transmissivity, and reduces the likelihood of scratches during alignment layer formation.
Implementation Method 1
Air is sprayed on the first polymeric film along a first negative direction in the sub pixel areas of an n-th (n is a natural number) row of a unit pixel area, and air is sprayed on the first polymeric film along a first positive direction opposite to the first negative direction in the sub pixel areas of an (n+1)-th row of the unit pixel area to form a first alignment layer
Data Source
AI summary
Air is sprayed on the first polymer film along a first negative direction in the sub pixel areas of an n-th row of a unit pixel area, and air is sprayed on the first polymer film along a first positive direction in the sub pixel areas of an (n+1)-th row of the unit pixel area to form a first alignment layer. Air is sprayed on the second polymer film along a second negative direction crossing the first negative direction in the sub pixel areas of an n-th column of the unit pixel area, and air is sprayed on the second polymer film along a second positive direction crossing the first positive direction in the sub pixel areas of an (n+1)-th column of the unit pixel area to form a second alignment layer.