Bonding Filament Cell Seal for Narrow-Bezel Display Panels
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Solution Overview
Problem
Existing display devices face challenges in minimizing the area occupied by cell seals, which affects the display quality and bezel size, particularly in LCD and OLED devices where light transmittance is a critical factor.
Innovation Solution
A display device design featuring a cell seal with a bonding filament that connects two substrates, where the filament has a specific width and refractive index gradient, and is formed using a laser radiation method to reduce the seal area, allowing for a narrower bezel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a traditional cell seal structure is used to bond two substrates, then the bonding strength is sufficient, but the area occupied by the cell seal is large, which increases the bezel size and reduces light transmittance
Solution Approach 1:
The cell seal is segmented into a first sealing structure and a second sealing structure that are disposed at different positions and bonded to different surfaces of the substrates. This segmentation allows each sealing structure to be thinner while collectively providing sufficient bonding strength, thereby reducing the overall area occupied by the cell seal and enabling a narrower bezel structure.
Solution Approach 2:
The sealing structures extend in the thickness direction (Z-axis) of the substrates rather than only in the planar direction. By utilizing the thickness dimension, the sealing structures achieve sufficient bonding strength with reduced planar area occupation, allowing the cell seal to occupy less area in the display device plane while maintaining adequate bonding capability through extended thickness.
2Area of moving object
If the cell seal area is reduced to enable narrower bezel, then the display area increases, but the bonding strength between substrates may be insufficient
Solution Approach 1:
The bonding function is segmented between two separate sealing structures located at different positions. Each sealing structure contributes to the overall bonding strength, so that even with reduced individual area, the combined bonding reliability remains sufficient to hold the substrates together.
Solution Approach 2:
The sealing structures utilize the thickness direction to compensate for reduced planar area. By extending in the Z-axis direction, they achieve adequate bonding volume and strength even when their projection area on the substrate plane is minimized, thus maintaining bonding reliability while maximizing display area.
3Illumination intensity
If a thick cell seal is used to ensure bonding strength, then the bonding reliability is high, but the light transmittance is reduced and the bezel size increases
Solution Approach 1:
The sealing function is divided into two thinner sealing structures instead of one thick sealing structure. Each sealing structure has reduced thickness, allowing light to pass through more effectively, while their combined presence provides sufficient bonding strength, thus improving light transmittance without compromising bonding reliability.
Solution Approach 2:
The sealing structures are oriented to extend primarily in the thickness direction rather than the planar direction. This dimensional reorientation allows them to provide adequate bonding volume with minimal impact on light transmittance, as light travels through the substrates in the thickness direction and the sealing structures are positioned to minimize obstruction.
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 reduces the area occupied by the cell seal, enabling a narrower bezel structure and improved display quality by minimizing the seal's impact on light transmittance and display area.
Implementation Method 1
formed using a laser radiation method to reduce the seal area
Data Source
AI summary
A display device includes: a first substrate in which a display area and a non-display area disposed outside the display area are defined; a second substrate facing the first substrate; and a cell seal disposed on the non-display area, where the cell seal includes a bonding filament connecting the first substrate and the second substrate to each other.