Display Fan-Out Line Layout for ESD Protection and Short Isolation
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Solution Overview
Problem
Display devices face challenges in reducing the size of non-display areas, protecting electrodes and lines from static electricity, and preventing short-circuit risks in fan-out areas.
Innovation Solution
The display device incorporates a fan-out line in the metal layer of the fan-out area, with a first voltage line and a second voltage line disposed in the source-drain and electrode layers, respectively, featuring plate portions that overlap in the thickness direction, and a specific thickness and area configuration to reduce the fan-out area size and prevent short circuits while protecting against static electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the fan-out area is reduced in size, then the display area can be expanded, but the risk of short circuits and static electricity damage increases
Solution Approach 1:
The patent transitions from planar voltage line arrangement to three-dimensional stacking, placing voltage lines in different layers (first voltage line in lower layer, second voltage line in upper layer) to achieve spatial separation. This vertical dimensionality change allows reduced fan-out area while maintaining electrical isolation and preventing short circuits.
Solution Approach 2:
The patent implements nested layering where the first voltage line is embedded in a lower layer and the second voltage line is embedded in an upper layer, with insulating layers nested between them. This nested structure allows compact arrangement of multiple voltage lines in a small fan-out area while maintaining electrical isolation.
2Area of stationary object
If voltage lines are placed closer together to reduce fan-out area, then device size is reduced, but static electricity protection capability deteriorates
Solution Approach 1:
The patent uses nested layering with the first voltage line in a lower layer and the second voltage line in an upper layer, separated by insulating layers. This vertical nesting maintains adequate electrical isolation distance for static electricity protection while reducing the horizontal fan-out area.
Solution Approach 2:
The patent moves voltage line separation from horizontal distance to vertical distance by placing voltage lines in different layers. This dimensional change allows compact horizontal arrangement while maintaining sufficient vertical isolation for static electricity protection.
3Reliability
If plate portions of voltage lines are increased in area to reduce resistance, then electrical performance is improved, but the fan-out area size increases
Solution Approach 1:
The patent increases the effective area of voltage lines by extending them into the vertical dimension across multiple layers. The first plate portion and second plate portion are positioned at different heights, providing larger total conductive area for reduced resistance without increasing the horizontal footprint of the fan-out area.
Solution Approach 2:
The patent nests voltage line plate portions in different layers, allowing each plate portion to have sufficient area for low resistance while the nested arrangement keeps the overall horizontal area compact.
Data Source
AI summary
A display device includes a display area comprising pixels, a fan-out area, a pad area, a display driver, a metal layer disposed on a substrate, a data line, a first voltage line, and a second voltage line extending in a first direction on the metal layer in the display area, a fan-out line electrically connecting the data line to the display driver on the metal layer in the fan-out area, a gate line disposed on the metal layer in the display area and extending in a second direction intersecting the first direction, a source-drain layer disposed on the gate line, and an electrode layer disposed on the source-drain layer. The first voltage line includes a first plate portion disposed on the source-drain layer in the fan-out area, and the second voltage line comprises a second plate portion disposed on the electrode layer in the fan-out area.