LCD Alignment Film Sealing for Narrow Frame and Reliability
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Solution Overview
Problem
In liquid crystal displays (LCDs), the alignment film made of water-absorbing materials can hydrolyze when exposed to outside air, leading to nonuniform display near the frame due to partial overlap with the sealant, and fine cracks in the glass edge during cutting can compromise panel reliability.
Innovation Solution
An LCD panel design where the alignment film extends outside the sealant and is covered with a sealing layer, made of water-based glue materials like epoxy resin or organic silicon, to prevent hydrolysis and crack propagation, ensuring reliable sealing and improved production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the alignment film is partially overlapped with the sealant to achieve narrow frame, then the substrate utilization rate is improved, but the alignment film hydrolyzes due to exposure to outside air, causing nonuniform display near the frame
Solution Approach 1:
A sealing layer is introduced as an intermediary between the alignment film and the outside air. This sealing layer prevents the alignment film from hydrolyzing while allowing the alignment film to extend beyond the sealant for narrow frame design, thus resolving the contradiction between substrate utilization rate and display uniformity
Solution Approach 2:
The sealing layer acts as a protective thin film that covers the alignment film exposed outside the sealant. This flexible film prevents moisture and oxygen from reaching the alignment film, preventing hydrolysis while maintaining the narrow frame structure
2Productivity
If the alignment film is extended outside the sealant to achieve narrow frame, then the substrate utilization rate is improved, but fine cracks in the glass edge can spread into the panel, compromising reliability
Solution Approach 1:
The sealing layer serves as a protective intermediary that fills and seals the area where the alignment film extends outside the sealant. This prevents fine cracks in the glass edge from spreading into the panel while maintaining the narrow frame design
Solution Approach 2:
The sealing layer is applied beforehand to prevent crack propagation. By sealing the edge area where the alignment film extends, the structure is reinforced against impact forces that could cause cracks to spread, thus improving panel reliability
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
The solution effectively isolates the alignment film from outside air, prevents hydrolysis, and enhances panel reliability by sealing the glass edge cracks, resulting in improved display quality and reduced material costs.
Implementation Method 1
the alignment film (PI) is made of a water absorbing material, if the alignment film (PI) is completely overlapped with the sealant, and the alignment film (PI) is in contact with the outside air, the alignment film (PI) will be hydrolyzed because of absorbing the outside vapor
Data Source
AI summary
The invention provides an LCD panel, an LCD device, and a method for manufacturing a panel. The LCD panel includes an upper substrate and a lower substrate which are arranged opposite to each other. Opposite inner sides of the upper substrate and the lower substrate are respectively provided with a layer of alignment film, a sealant is arranged between the upper substrate and the lower substrate, the alignment film is arranged to extend outside the sealant area, and a surface of the alignment film exposed outside the sealant is provided with a sealing layer. In the invention, the alignment film is arranged to extend outside the sealant, which enable a narrow frame to be used to the LCD panel, and improves the utilization rate of the substrate; moreover, the alignment film exposed outside the sealant is sealed, to completely isolate the alignment film from the outside air; thus, the alignment film cannot be hydrolyzed because of absorbing the outside vapor, thereby ensuring the display quality.