Liquid Crystal Display Stopper Prevents Conductive Paste Flow
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Solution Overview
Problem
In small liquid crystal displays, a narrow frame region limits the space for scanning-line lead lines, sealant, and conductive paste, leading to potential defects during panel separation due to conductive paste spreading beyond the predetermined region.
Innovation Solution
A stopper is formed on the counter substrate outside the conductive paste to prevent it from flowing outward, with the stopper and columnar spacer made of the same material and process, ensuring the conductive paste remains within the frame region, even in narrow frame configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the frame portion width is reduced to increase display region area, then the display region area increases, but the space for scanning-line lead lines, sealant, and conductive paste becomes insufficient
Solution Approach 1:
The frame portion is segmented into distinct functional regions: a sealant formation region with predetermined width for bonding substrates, and a conductive paste formation region for electrical connections. This segmentation allows each region to be optimized independently, ensuring sufficient space for all components even when the overall frame width is minimized to maximize display area.
2Length of moving object
If the frame portion becomes small, then the overall device size is reduced, but it becomes difficult to ensure sufficient space for scanning-line lead lines and sealant formation
Solution Approach 1:
Different regions of the frame portion are assigned different functional characteristics: the sealant formation region is designed with specific width to ensure adequate bonding space, while the conductive paste formation region is positioned to accommodate electrical connections. This local differentiation of functional qualities allows the frame to maintain manufacturing feasibility within a compact overall size.
3Reliability
If conductive paste is formed in the frame region without a stopper, then electrical connection is established, but the conductive paste flows outward causing defects during panel separation
Solution Approach 1:
A stopper structure is introduced as an intermediary element between the conductive paste formation region and the exterior. This stopper confines the conductive paste within the frame region, preventing it from flowing outward during panel separation while maintaining the electrical connection function. The stopper acts as a boundary that mediates between the need for electrical connectivity and the need to prevent paste migration.
Data Source
AI summary
Disclosed is a liquid crystal display device that is capable of preventing a conductive paste for connecting a common wiring line of a TFT substrate and a counter electrode of a counter substrate from flowing outward. A sealant is formed outside a display region of a liquid crystal display device. A conductive paste for connecting a common wiring line of a TFT substrate and a counter electrode of a counter substrate is provided at a corner of the liquid crystal display device outside the sealant. An L-shaped stopper is formed on the counter substrate so as to prevent the conductive paste from flowing outward. With the stopper, even if the width of a frame is equal to or less than 1.5 mm, it is possible to prevent the conductive paste from flowing outward.