Tiled Display Device With Contact-Hole Dam Isolation
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Solution Overview
Problem
Large-sized display devices face increased defects in light-emitting elements due to the number of pixels, leading to decreased productivity and reliability, and the seams between sub-display devices cause a sense of disconnection in the image, lowering viewer immersion.
Innovation Solution
A dam pattern made of insulating material is formed around contact holes to prevent short-circuiting of adjacent conductive lines, ensuring reliable connection and disconnection in the patterning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of pixels is increased to achieve large-sized display, then the display area is improved, but the defect rate of light-emitting elements increases and reliability decreases
Solution Approach 1:
The display device is divided into multiple sub-display devices that are tiled together to form a large-sized display. Each sub-display device contains a reduced number of pixels, which decreases the defect rate of light-emitting elements in each individual device while achieving a large overall display area through the segmentation of the display into multiple manageable units.
2Area of stationary object
If sub-display devices are connected to form large-sized screen, then the display area is improved, but seams appear between adjacent sub-display devices causing disconnection sense
Solution Approach 1:
The non-display area or bezel area that causes visible seams between adjacent sub-display devices is removed or minimized. By extracting or eliminating this separating element, the sub-display devices can be connected directly edge-to-edge, creating a seamless large-sized display without the disconnection sense caused by traditional bezels or boundaries.
3Ease of manufacture
If conductive lines are disposed adjacent to contact hole without dam pattern, then the manufacturing process is simplified, but short-circuiting between lines occurs
Solution Approach 1:
A dam pattern made of insulating material is introduced as an intermediary element between adjacent conductive lines near contact holes. This dam pattern acts as a physical barrier that prevents short-circuiting between the lines during the patterning process, while being formed through standard manufacturing steps that integrate smoothly into the existing fabrication workflow.
4Reliability
If dam pattern is formed around contact hole, then short-circuiting is prevented and reliability is improved, but device complexity increases
Solution Approach 1:
The dam pattern is formed using standard patterning parameters and materials that are already part of the manufacturing process. By utilizing existing process parameters and materials, the dam pattern can be integrated without significantly increasing device complexity, while still providing the necessary electrical isolation to prevent short-circuiting between adjacent conductive lines.
Data Source
AI summary
A display device includes a first substrate, an external signal line disposed on the first substrate, a second substrate disposed on the external signal line, the second substrate includes a contact hole exposing a surface of the external signal line, a lower metal layer disposed on the second substrate, the lower metal layer includes a lower connection pattern, a dam pattern disposed on the lower metal layer and adjacent to the contact hole, and a first conductive layer disposed on the lower metal layer, the first conductive layer includes a voltage line and a connection line spaced apart from each other with the dam pattern disposed between the voltage line and the connection line.