LCD Panel Cross Protrusion for Narrow Bezel Sealant Cutting
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Solution Overview
Problem
The challenge in manufacturing ultra-narrow bezel LCD panels is the excessive cornering radius of sealant coating machines, which leads to issues like cracking and peeling when directly cutting the sealant, affecting the display area and overall display effect.
Innovation Solution
The design incorporates a cross-shaped protrusion on the inner sides of the thin film transistor and color filter substrates at the corners, along with a barrier wall, to prevent sealant overflow and improve cutting accuracy, ensuring the sealant is removed without damaging the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the sealant width is greatly reduced to achieve narrow bezels, then the bezel width is reduced, but the cornering radius cannot be reduced below 500 um due to machine limitations, causing the sealant to affect the display area
Solution Approach 1:
The sealant coating process is segmented into multiple passes: a first coating pass and a second coating pass. The first pass applies sealant with a larger effective coating width to ensure corner coverage, while the second pass applies sealant with a narrower effective coating width to define the final narrow bezel width. This segmentation allows the machine's cornering radius limitation to be overcome by using the first pass for cornering and the second pass for precision width control.
2Manufacturing precision
If cross coating or circular coating methods are used to reduce cornering radius effects, then the sealant can be applied to ultra-narrow bezels, but excess sealant must be removed by cutting, causing cracking and peeling due to adhesion
Solution Approach 1:
A release layer is applied to the color filter substrate before the sealant coating process. This release layer serves as a preliminary action that prevents the sealant from adhering to the color filter substrate during coating and subsequent cutting operations. By incorporating this release layer, the sealant can be cleanly removed without causing cracking or peeling of the color filter substrate, thereby maintaining reliability during the cutting process.
3Shape
If the sealant is directly cut off at the corners, then the narrow bezel shape is achieved, but cracking and peeling occur due to sealant adhesion
Solution Approach 1:
The release layer acts as an intermediary between the sealant and the color filter substrate. During the cutting process, this intermediary layer allows the sealant to be separated cleanly from the color filter substrate without causing damage. The release layer absorbs the stress that would otherwise cause cracking and peeling, thereby preserving the strength and integrity of the color filter substrate while still achieving the desired narrow bezel shape.
Data Source
AI summary
A liquid crystal display (LCD) panel is disclosed. The LCD panel includes a thin film transistor substrate having a display area and a peripheral area; a color filter substrate disposed on the thin film transistor substrate with a distance; and a cross-shaped protrusion disposed on an inner side of the thin film transistor substrate, an inner side of the color filter substrate, or the inner side of the thin film transistor substrate and the inner side of the color filter substrate. The cross-shaped protrusion is located at a corner of the peripheral area. The LCD panel is provided with the cross-shaped protrusion to prevent sealant adhesion resulting in poor cutting.