Display Device Seal Unit Protrusion for Narrow Frame Cutting
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Solution Overview
Problem
In the manufacturing of liquid crystal display devices, the overlap of the seal unit with the cutting or dividing position can lead to cut failure, and if the cut position is distant from the seal unit, it results in a widened frame, complicating the fabrication process.
Innovation Solution
The implementation of a protrusion and a spacing adjustment layer along the outer edge of the seal unit on both substrates, which form a wall to block the seal unit material, preventing overlap and allowing for a narrower frame by ensuring the seal unit does not overlap with the division line during substrate cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the seal unit overlaps with the cutting or dividing position, then the frame can be narrowed, but cut failure occurs
Solution Approach 1:
The invention divides the sealing structure into two separate components: a seal unit and a sealing auxiliary unit. The seal unit is positioned at the display region boundary while the sealing auxiliary unit extends toward the division line, creating a segmented sealing system that prevents material overflow without compromising cut reliability.
Solution Approach 2:
The sealing auxiliary unit acts as an intermediary structure between the seal unit and the division line. It provides an additional barrier that intercepts seal unit material before it can reach the division line, enabling the cut position to be closer to the seal unit without causing cut failure.
2Reliability
If the cut position is distanced from the seal unit, then cut failure is avoided, but the frame is widened
Solution Approach 1:
By segmenting the sealing function into two units positioned at different locations, the invention allows the cut position to be optimally placed between them. This segmentation enables closer cutting distances while maintaining reliability through the distributed sealing approach.
Solution Approach 2:
The sealing auxiliary unit extends in the horizontal direction parallel to the substrate surface, creating a new dimensional approach to blocking material overflow. This horizontal extension allows the seal unit to be positioned closer to the division line without compromising reliability.
3Manufacturing precision
If the seal unit material overflows during cutting, then manufacturing precision deteriorates, but preventing overflow requires additional structural elements
Solution Approach 1:
The sealing function is segmented into two units with distinct roles: the seal unit provides primary sealing at the display boundary, while the sealing auxiliary unit provides secondary protection near the division line. This segmentation prevents material overflow without requiring a single complex sealing structure.
Solution Approach 2:
Different parts of the sealing system have different properties and positions. The seal unit is positioned at the display region boundary with specific sealing properties, while the sealing auxiliary unit is positioned near the division line with extended horizontal dimensions. This local differentiation optimizes each component's function while maintaining overall manufacturing precision.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate, a display layer, a seal unit, a protrusion and a spacing adjustment layer. The display layer is provided between the first substrate and the second substrate. The seal unit surrounds the display layer between the first substrate and the second substrate. The protrusion is provided along an outer edge of the seal unit at an outside of the seal unit on a first major surface of the first substrate facing the display layer. The spacing adjustment layer is provided along the outer edge at the outside of the seal unit, includes a portion overlaying the protrusion as viewed along a direction from the first substrate toward the second substrate, and is in contact with the protrusion.