Segmented Column Spacer Structure for LCD Cell Gap Stability
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices with column spacers suffer from touch defects due to large frictional forces and gravity defects caused by thermal expansion, leading to long-lasting spots and swollen portions, respectively, and are prone to deformation during push tests.
Innovation Solution
The implementation of a liquid crystal display device with protrusions on one substrate and corresponding column spacers on the other, reducing the contact area and frictional force, and maintaining a stable cell gap through the use of elastic materials and strategically positioned spacers to prevent deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If column spacers are used to maintain cell gap, then the cell gap is maintained, but large contact area causes large frictional force leading to touch defects
Solution Approach 1:
The column spacer is divided into two distinct parts: a first column spacer that contacts the first substrate and a second column spacer that contacts the second substrate. This segmentation allows the first column spacer to have a smaller contact area with the first substrate, reducing frictional force and preventing touch defects, while the second column spacer maintains the cell gap between substrates.
Solution Approach 2:
Different parts of the column spacer structure are given different properties: the first column spacer has a smaller contact area optimized for reducing friction, while the second column spacer is positioned to maintain the cell gap. This local differentiation of properties allows simultaneous achievement of low friction and stable cell gap maintenance.
2Stability of the object's composition
If column spacers are used to maintain cell gap, then the cell gap is maintained, but thermal expansion causes gravity defects and swollen portions
Solution Approach 1:
The column spacer is segmented into first and second column spacers positioned at different locations between the substrates. This segmentation allows for better distribution of thermal expansion forces and prevents concentrated stress that leads to gravity defects and swollen portions.
Solution Approach 2:
The column spacer acts as an intermediary structure between the first and second substrates, absorbing and distributing thermal expansion forces. By positioning the first column spacer with smaller contact area and the second column spacer to maintain gap, the structure mediates thermal stresses to prevent gravity defects.
3Device complexity
If conventional column spacers are used, then structure is simple, but deformation occurs during push tests
Solution Approach 1:
The column spacer is divided into first and second column spacers with different functions and positions. The first column spacer with smaller contact area reduces friction, while the second column spacer maintains cell gap stability. This segmented structure enhances overall reliability during push tests without significantly increasing device complexity.
Solution Approach 2:
The column spacer structure is designed in advance with specific geometries and positions to prevent deformation during push tests. The first column spacer's smaller contact area and the second column spacer's gap-maintaining position are predetermined to distribute forces and prevent deformation before the push test occurs.
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 configuration enables rapid restoration from touch defects, prevents gravity-induced swelling, and enhances durability during push tests by distributing pressure and maintaining a stable cell gap, thus improving the overall structural integrity and performance of the LCD device.
Implementation Method 1
conventional liquid crystal display (LCD) devices with column spacers suffer from touch defects due to large frictional forces
Implementation Method 2
maintaining a stable cell gap through the use of elastic materials and strategically positioned spacers to prevent deformation
Data Source
AI summary
A liquid crystal display device includes a first substrate and a second substrate arranged to face each other; at least one protrusion formed on the first substrate at a first region, the at lest one protrusion having a recess therein; a first column spacer formed on the second substrate corresponding to the at least one protrusion; and a liquid crystal layer filled between the first and second substrates.