Alternating Height Sealing Member for LCD Frame Area Reduction
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Solution Overview
Problem
In liquid crystal display devices, reducing the area of the frame section while maintaining the sealing integrity is challenging due to the spreading of oriented films with high fluidity materials like polyimide resin, which can lead to deteriorated sealing properties and non-uniform thickness of the liquid crystal layer.
Innovation Solution
A sealing section configuration with alternating high and low portions in the sealing member, where the high portions act as spacers and the low portions enhance fluidity, ensuring the sealing material adheres outside the spacer regions, preventing film spreading and maintaining adhesion strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the area of the frame section is reduced, then the display device becomes more compact and efficient, but the separation distance between the display region and sealing section decreases, causing the oriented film to spread and remain sandwiched between the substrate and sealing material, deteriorating sealing properties
Solution Approach 1:
The sealing member is segmented into alternating high portions and low portions along the sealing section. The high portions act as spacers to prevent oriented film spreading, while the low portions allow sealing material adhesion. This segmentation enables the sealing section to maintain reliability even with reduced frame section area.
Solution Approach 2:
Different portions of the sealing member have different heights to perform different functions locally. The high portions provide spacing and prevent film spreading in specific regions, while the low portions facilitate sealing material adhesion in other regions. This local differentiation resolves the contradiction between compact size and sealing reliability.
2Reliability
If a wide space is ensured around the display region by significantly increasing the separation distance, then the oriented film and sealing material are prevented from overlapping, but the area of the frame section increases, reducing device compactness
Solution Approach 1:
The sealing member is divided into alternating high and low portions, where high portions provide localized spacing to prevent oriented film spreading without requiring a large overall separation distance. This segmentation enables reliable sealing with a compact frame section area.
Solution Approach 2:
Instead of increasing the horizontal separation distance (2D approach), the invention utilizes the vertical dimension by creating alternating high and low portions in the sealing member. This vertical differentiation achieves the same effect of preventing film spreading while maintaining a compact overall device size.
3Reliability
If a damping member is provided in the frame region to suppress oriented film spreading, then film spreading is controlled, but the damping member needs to be provided in the sealing section when frame area is reduced, causing spreading of the sealing section to be inhibited
Solution Approach 1:
The sealing member is segmented into alternating high portions (acting as damping members to suppress oriented film spreading) and low portions (allowing sealing material spreading). This segmentation enables both functions to coexist within the sealing section without inhibiting sealing material spreading.
Solution Approach 2:
Different portions of the sealing member have different heights to perform different functions locally. The high portions provide damping to suppress oriented film spreading in specific regions, while the low portions facilitate sealing material spreading in other regions. This local differentiation resolves the contradiction between film spreading control and sealing material productivity.
Data Source
AI summary
To improve the reliability of a display device, a liquid crystal display device includes a substrate having a back surface, a substrate having a front surface opposing the back surface, a display functional layer arranged between the substrate and the substrate, and a sealing section SL that adhesively fixes the substrates around the display functional layer in a plan view. The sealing section SL includes a member PS extending along an outer edge of the display functional layer and sealing materials adjacently arranged on both sides of the member PS and continuously surrounding the periphery of the display functional layer in a plan view. The member PS includes a plurality of portions PS1 having a height TK1 and a plurality of portions PS2 arranged among the plurality of portions PS1 and having a height TK2 smaller than the height TK1.