Display Driver Terminal Layout for Narrow-Bezel Wiring
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Solution Overview
Problem
The existing display devices face challenges in minimizing the frame width due to deformation issues near the end portions of the semiconductor element during thermocompression bonding, which increases the routing space for wiring lines and results in a larger frame size.
Innovation Solution
The display device configuration includes a driver with specific terminal and wiring line arrangements, where first and second terminals are positioned to allow first wiring lines to cross one side portion and second wiring lines to cross the other side portion, optimizing the routing region and minimizing the frame width by using a staggered arrangement of terminals and wiring lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bumps are disposed in the vicinity of both end portions of the long side to suppress deformation during thermocompression bonding, then deformation is suppressed, but wiring line routing space increases and frame width increases
Solution Approach 1:
The patent changes the routing dimension by having second wiring lines extend in the second direction (perpendicular to the long side) rather than only in the first direction (parallel to the long side). This allows wiring lines to route around bumps by changing direction, reducing the horizontal space needed and preventing frame width increase while still suppressing deformation through proper bump placement.
Solution Approach 2:
The patent introduces flexibility in wiring line routing by allowing second wiring lines to extend in multiple directions (first direction and second direction) rather than being constrained to a single path. This dynamic routing approach enables the wiring to adapt around bumps and terminals, optimizing space utilization and reducing frame width while maintaining reliable connections.
2Device complexity
If second terminals are arranged to gradually approach the other long side from the central portion toward the end portion, then terminal arrangement is optimized, but deformation occurs in the vicinity of end portions during thermocompression bonding
Solution Approach 1:
The patent segments the terminal arrangement into two distinct groups: first terminals arranged parallel to the long side, and second terminals arranged to gradually approach the other long side. This segmentation allows each group to serve different functional purposes while managing deformation risks through corresponding bump placements and wiring line routing strategies for each segment.
Solution Approach 2:
The patent employs asymmetric arrangement where second terminals are positioned to gradually approach the other long side rather than being uniformly distributed. This asymmetric placement optimizes electrical connection efficiency while the corresponding asymmetric bump placement and wiring line routing compensate for deformation risks in specific regions during thermocompression bonding.
3Ease of manufacture
If first wiring lines are routed to connect to first terminals and second wiring lines to connect to second terminals with staggered arrangement, then routing space is optimized, but frame width increases
Solution Approach 1:
The patent utilizes the second direction (perpendicular to the long side) as an additional routing dimension for second wiring lines. Instead of routing all wiring lines parallel to the long side which consumes horizontal space, the invention allows wiring lines to extend perpendicular to the long side, effectively using the vertical dimension to reduce frame width while maintaining adequate routing space for manufacturing.
Data Source
AI summary
A display device includes a display panel having a main surface including a display region and a non-display region, a driver, a first terminal provided at a position overlapping with the driver, a first wiring line connected to the first terminal, a second terminal provided at a position overlapping with the driver and being farther from the display region than the first terminal, and a second wiring line connected to the second terminal. The driver has a rectangular planar shape, and has a first side portion closest to the display region and a second side portion connected to the first side portion. The first wiring line extends from the first terminal and is disposed across the first side portion, and the second wiring line extends from the second terminal and is disposed across the second side portion.