Tiled Display Pad Connection Layout for Narrow Bezels
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Solution Overview
Problem
Tiled display devices have non-display areas, known as bezels, which hinder viewer immersion due to overlapping display device bezels, and existing fabrication processes can damage the circuit layer during the formation of driving circuits and pad units.
Innovation Solution
A display device design featuring a circuit layer on a substrate with a first pad unit, an auxiliary substrate with a driving circuit and second pad unit, and connection electrodes that align and electrically connect the first and second pad units, reducing the size of non-display areas and preventing circuit layer damage by attaching the auxiliary substrate to the substrate separately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the driving circuit and pad unit are formed directly on the substrate, then the fabrication process is simplified, but the circuit layer may be damaged during the formation process
Solution Approach 1:
The patent divides the substrate into two separate substrates: a first substrate for forming the circuit layer and a second substrate for forming the driving circuit and pad unit. This segmentation allows each substrate to be processed independently, preventing damage to the circuit layer while maintaining fabrication simplicity.
Solution Approach 2:
The patent introduces a separate second substrate as an intermediary carrier for the driving circuit and pad unit. This intermediary structure enables the driving circuit to be formed without direct contact with or potential damage to the circuit layer on the first substrate.
2Ease of manufacture
If the bezel area is enlarged to accommodate drive IC and printed circuits, then the driving circuit can be properly disposed, but the non-display area increases reducing viewer immersion
Solution Approach 1:
The patent moves the driving circuit and pad unit from the traditional planar bezel area onto a separate second substrate that is attached to the side surface of the first substrate. This dimensional transition from 2D (bezel plane) to 3D (side surface attachment) enables compact integration without increasing the front-facing non-display area.
Solution Approach 2:
The patent nests the second substrate containing the driving circuit and pad unit within the overall device structure by attaching it to the side surface of the first substrate. This nesting approach allows the driving circuit to be accommodated within the device footprint rather than adding to the external dimensions.
Data Source
AI summary
A display device and a method for fabricating the same. The display device includes a substrate including a circuit layer and a first pad unit; an auxiliary substrate disposed below the substrate and comprising a driving circuit and a second pad unit; a light-emitting unit disposed on the circuit layer; and a connection electrode in contact with a side surface of the substrate and electrically connecting the first pad unit with the second pad unit. The method includes forming a circuit layer and a first pad unit on a first surface of a substrate; forming a driving circuit and a second pad unit on a fourth surface of an auxiliary substrate; and attaching a second surface of the substrate opposite the first surface to a third surface of the auxiliary substrate opposite the fourth surface.