Liquid Crystal Display Column Spacer Protrusion Alignment
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Solution Overview
Problem
Liquid crystal display devices with column spacers suffer from touch degradation due to large static friction and gravity degradation caused by thermal expansion, leading to substrate shifting and opaqueness issues.
Innovation Solution
Incorporating a protrusion on one substrate corresponding to the column spacer and a compensation pattern around its periphery, reducing frictional contact area and allowing for easier substrate alignment, while also providing a dual column spacer structure to manage thermal expansion and external pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If column spacers are used to sustain cell gap, then cell gap stability is improved, but frictional contact area increases causing touch degradation
Solution Approach 1:
The column spacer is divided into two functional parts: a lower portion that contacts the protrusion for stability, and an upper portion that is spaced from the facing substrate to prevent friction-based touch degradation. This segmentation allows the spacer to maintain cell gap stability while eliminating the harmful frictional contact.
Solution Approach 2:
The protrusion acts as an intermediary element between the column spacer and the facing substrate. Instead of the column spacer directly contacting the substrate (causing friction), the protrusion mediates the contact, allowing the spacer to sustain the cell gap without direct frictional interaction with the substrate.
2Stability of the object's composition
If column spacers are used to sustain cell gap, then cell gap stability is improved, but thermal expansion causes gravity degradation
Solution Approach 1:
The column spacer structure is segmented into a lower portion for thermal expansion accommodation and an upper portion for cell gap maintenance. The lower portion can expand thermally without compromising the upper portion's ability to sustain the cell gap, thus preventing gravity degradation while maintaining stability.
Solution Approach 2:
The design allows for parameter changes in the lower portion of the column spacer (specifically its ability to expand thermally) without affecting the critical parameter of cell gap height maintained by the upper portion. This enables the spacer to adapt to thermal expansion while preserving cell gap stability.
3Object-affected harmful factors
If protrusion is added to reduce friction, then touch degradation is prevented, but device complexity increases
Solution Approach 1:
The protrusion is merged with the pixel electrode structure, forming an integrated component rather than a separate element. This combining approach reduces device complexity by eliminating the need for additional discrete components while still achieving the friction-reduction benefit.
Solution Approach 2:
The protrusion serves multiple functions: it reduces frictional contact to prevent touch degradation, maintains cell gap stability, and provides a reference point for substrate alignment. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
Data Source
AI summary
A liquid crystal display device includes first and second substrates facing each other, first and second column spacers on the second substrate, a protrusion on the first substrate corresponding to the first column spacer, a compensation pattern on the first substrate corresponding to a periphery of the second column spacer, and a liquid crystal layer between the first and second substrates.