Display Device Slit Pattern for Crack-Free Partitioning
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Solution Overview
Problem
The performance of display devices can deteriorate due to cracking in partition sections during the production process of EL elements, which affects the integrity and functionality of the devices.
Innovation Solution
A display device design that includes a TFT layer with multiple inorganic insulating films, a light emitting element layer, and a sealing layer, featuring a slit pattern that penetrates through at least one of the inorganic insulating films outside the display region and inside the edges of the support material, reducing the risk of cracking during partitioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the layered body is partitioned to obtain individual display devices, then productivity is improved, but cracking occurs in the partition sections causing performance deterioration
Solution Approach 1:
The patent introduces slit patterns that penetrate through inorganic insulating films to create predetermined separation zones. These slits segment the layered body in a controlled manner, allowing clean partitioning into individual display devices while preventing uncontrolled cracking in the TFT and sealing layers. The segmentation principle is applied by creating deliberate weak points (slits) that guide the partitioning process.
Solution Approach 2:
The slit patterns are formed in advance during the manufacturing process, before the partitioning step is performed. This preliminary action of creating slits in the inorganic insulating films prepares the structure for subsequent clean separation, preventing cracking during the actual partitioning operation. The slits act as pre-defined separation paths that guide the cutting process.
2Reliability
If the slit pattern penetrates through inorganic insulating films, then cracking is prevented during partitioning, but device structure becomes more complex
Solution Approach 1:
The slit pattern is applied locally only in specific regions where partitioning is required, rather than uniformly across the entire device. The slits are positioned in the inorganic insulating films at predetermined locations to create separation zones, while leaving other critical areas intact. This localized application maintains device integrity while enabling clean partitioning.
Data Source
AI summary
A display device includes: a support material; a TFT layer that includes a plurality of inorganic insulating films; a light emitting element layer; and a sealing layer. A slit pattern that penetrates through the plurality of inorganic insulating films is formed, in a plan view, outside a display region and inside edges of the support material.