Mounting Substrate Terminal Stacking for Narrow Bezel Displays
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Solution Overview
Problem
The increasing demand for higher definition and narrower bezel designs in liquid crystal display devices leads to a need for smaller terminal formation areas on TFT substrates, as the number of lead wires and data driver terminals increases, making it challenging to maintain adequate clearance and reduce the overlapping area with data drivers.
Innovation Solution
A mounting substrate configuration with multiple terminal portions and insulation films, where each terminal portion is connected through specific contact holes, allowing for adjustable overlap and reduced formation area, ensuring constant contact surfaces and minimizing the terminal's footprint while maintaining electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lead wires and data driver terminals is increased to achieve higher definition, then the display quality is improved, but the terminal formation area increases and clearance becomes insufficient
Solution Approach 1:
The terminal is designed with multiple terminal portions (first, second, and third terminal portions) arranged in the vertical direction (thickness direction of the substrate) rather than only in the plan view. This three-dimensional arrangement allows the terminal to connect to multiple contact holes at different heights, effectively utilizing the vertical dimension to reduce the horizontal footprint area required for terminal formation.
2Area of stationary object
If the terminal formation area is reduced to achieve narrower bezel, then the display area ratio is improved, but the contact surface area between terminal portions and contact holes may be insufficient
Solution Approach 1:
The terminal portions are nested within the contact holes in a stacked configuration. The first terminal portion is disposed in the first contact hole, the second terminal portion in the second contact hole, and the third terminal portion in the third contact hole, with each subsequent terminal portion positioned above the previous one. This nesting arrangement ensures that each terminal portion has sufficient contact area with its respective contact hole while maintaining a compact overall footprint.
3Area of stationary object
If multiple terminal portions are stacked vertically to reduce footprint, then the terminal formation area is reduced, but the structural complexity increases
Solution Approach 1:
The terminal is segmented into multiple distinct terminal portions (first, second, and third terminal portions) corresponding to different contact holes at different heights. Each terminal portion can be independently designed and optimized for its specific contact hole, while the overall structure maintains a systematic pattern that simplifies the manufacturing process through repetitive structures.
Data Source
AI summary
An array substrate includes at least: a glass substrate on which a driver is mounted; a panel side output terminal disposed in a mounting area of the glass substrate and connected to the driver; a first terminal portion; a gate insulation film including a first contact hole at a position overlapping a first terminal portion; a second terminal portion disposed to overlap at least a first contact hole and an opening edge of the first contact hole; a first interlayer insulation film including a second contact hole at a position overlapping a second terminal portion not to overlap the first contact hole; and a third terminal portion disposed to overlap at least the second contact hole and an opening edge of the second contact hole.