Liquid Crystal Device Pillar Spacer Alignment Control
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Solution Overview
Problem
In liquid crystal devices with variable lens arrays, controlling the position of scattered spacers is challenging, leading to unstable lens shapes and increased risk of abnormal alignment, which can result in display defects and reduced yield.
Innovation Solution
A liquid crystal device with pillar spacers on an alignment film, where the alignment treatment is applied except at areas overlapping with the spacers, ensuring consistent alignment and reducing the occurrence of abnormal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If scattered spacers are used to maintain liquid crystal layer thickness, then the device structure is simplified, but the positions of spacers cannot be controlled and lens characteristics become unstable
Solution Approach 1:
The patent divides the spacer function into two distinct components: scattered spacers for maintaining liquid crystal layer thickness and pillar spacers for defining lens patterns. This segmentation allows each type of spacer to perform its specific function independently, resolving the contradiction between structural simplicity and position control precision.
Solution Approach 2:
The alignment film serves as an intermediary layer between the scattered spacers and the liquid crystal molecules. By applying alignment treatment to the alignment film except at areas overlapping with pillar spacers, the patent enables precise control of liquid crystal alignment while maintaining the simplicity of scattered spacer structure.
2Manufacturing precision
If pillar spacers are used to control spacer positions, then spacer position control is improved, but abnormal alignment of liquid crystal molecules occurs
Solution Approach 1:
The patent applies alignment treatment to the alignment film locally, specifically excluding areas where pillar spacers are positioned. This local differentiation ensures that liquid crystal molecules align properly in lens regions while the pillar spacers maintain their position-defining function without causing abnormal alignment.
Solution Approach 2:
The alignment film is prepared with selective alignment treatment before the liquid crystal layer is formed. This preliminary action prevents abnormal alignment from occurring in the first place, rather than attempting to correct it afterward, thereby improving reliability while maintaining the precision benefits of pillar spacers.
3Reliability
If alignment treatment is applied to the entire alignment film, then liquid crystal alignment is improved, but abnormal alignment occurs at pillar spacer positions
Solution Approach 1:
The patent implements local quality by applying alignment treatment only to specific regions of the alignment film, specifically excluding areas where pillar spacers are located. This selective approach maintains alignment uniformity in lens regions while preventing the harmful effect of abnormal alignment at spacer positions.
Solution Approach 2:
The patent converts the potential harmful effect of pillar spacers into a beneficial feature by deliberately excluding alignment treatment at spacer positions. This approach ensures that pillar spacers serve as precise position markers without disrupting liquid crystal alignment, transforming what could be a source of defects into a functional advantage.
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 stabilizes the alignment of liquid crystal molecules, reducing display defects and improving yield by maintaining consistent lens performance.
Implementation Method 1
an alignment film with alignment treatment such that the liquid crystal molecules align
Data Source
AI summary
A liquid crystal device including: a first substrate, the first substrate being transparent; a second substrate disposed opposite the first substrate, the second substrate being transparent; a liquid crystal layer provided between the first substrate and the second substrate, the liquid crystal layer including liquid crystal molecules; an alignment film with alignment treatment such that the liquid crystal molecules align, the alignment film being provided on a surface of the first substrate, the surface facing the liquid crystal layer; and pillar spacers provided on the alignment film, wherein the alignment treatment is applied to the alignment film except at least a part of area in which each of the pillar spacers overlaps with the alignment film.