Tiled Display Panel Trace Layout for Narrow Bezels and Stable Signals
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Solution Overview
Problem
The mass transfer process of mini LED and micro LED chips is difficult, making it challenging to create large-size display apparatuses, and the bezel size and seam width in tiled displays affect image display quality.
Innovation Solution
A display panel design with connecting traces formed by three-dimensional printing, which are wider at specific portions to prevent corrosion and improve signal transmission, and a tiled display apparatus with aligned side surfaces for reduced bezel size and seam width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple small-sized mini LED display apparatuses are tiled together to achieve large-sized display panels, then the display size is increased, but the bezel size and seam width increase affecting image display quality
Solution Approach 1:
The connecting traces are designed to extend from the first surface through the side surface to the second surface of the substrate, utilizing the third dimension (depth/thickness) to route connections. This allows the traces to be positioned closer to the selected side surface, reducing the horizontal space required and thereby minimizing bezel size and seam width while maintaining electrical connectivity across tiled displays.
Solution Approach 2:
The connecting traces have varying widths along their length, with the first and third portions having greater maximum widths than the second portion. This local variation in trace width provides enhanced electrical connection areas at the electrode interfaces while maintaining a narrower profile along the side surface, thus reducing overall bezel size without compromising electrical performance.
2Reliability
If the connecting traces are made wider to improve signal transmission, then the signal transmission is improved, but the bezel size increases
Solution Approach 1:
The connecting traces employ variable width design where the first and third portions have greater maximum widths than the second portion. This ensures adequate signal transmission capability at the electrode connection points (first and third portions) while the narrower second portion along the side surface minimizes the horizontal space occupation, thus reducing bezel size without compromising signal integrity.
Solution Approach 2:
By routing the connecting traces through the side surface and utilizing the substrate thickness dimension, the design achieves sufficient electrical connection area without increasing the horizontal footprint. The traces extend vertically through the substrate, allowing adequate trace area for signal transmission while maintaining a compact horizontal profile that reduces bezel size.
3Area of stationary object
If the connecting traces are made narrower to reduce bezel size, then the bezel size is reduced, but the corrosion resistance and signal transmission deteriorate
Solution Approach 1:
The connecting traces have enhanced width at critical locations (first and third portions near the electrodes) to provide adequate electrical connection area and corrosion resistance, while the second portion along the side surface is narrower to minimize bezel size. This local variation ensures reliability where needed without sacrificing compactness.
Solution Approach 2:
The traces utilize the vertical dimension by extending from the first surface through the side surface to the second surface of the substrate. This three-dimensional routing allows the traces to achieve sufficient electrical performance and corrosion resistance through adequate trace area and electrode overlap, while maintaining a narrow horizontal profile that reduces bezel size.
Data Source
AI summary
A display panel includes a substrate, a plurality of light-emitting devices, first electrodes, second electrodes and connecting traces. The substrate includes a first surface, a second surface and a plurality of side surfaces connecting the two. At least one of the side surfaces is a selected side surface. Each of the plurality of connecting traces includes a first portion, a second portion, and a third portion connected in sequence; the first portion is disposed at least on the first surface and electrically connected to one of the plurality of first electrodes, the second portion is disposed on the selected side surface, and the third portion is disposed at least on the second surface and electrically connected to one of the plurality of second electrodes. In a first direction, a maximum width of the first portion and/or that of the third portion is greater that that of the second portion.