Bent Substrate Tiled Display Structure for Seamless Boundaries
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Solution Overview
Problem
Large-sized display devices face increased defect rates and reduced productivity due to the number of pixels, leading to a sense of disconnection and reduced immersion when multiple display devices are tiled together, as the boundary portions between them are noticeable.
Innovation Solution
A tiled display device design that bends a substrate and bonds a flexible film and source driver at the rear surface, minimizing the boundary area by using pattern holes and fan-out lines to connect pixels across adjacent display areas, thereby reducing the visibility of seams and improving immersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple display devices are tiled together to create a large-sized screen, then the display area is increased, but the boundary portions between devices create a sense of disconnection and reduce immersion
Solution Approach 1:
The patent merges adjacent display devices by bonding their substrates together at boundary portions through the bent regions. This integration makes the boundary portions invisible or unrecognizable, creating a unified large-sized display that eliminates the sense of disconnection between individual devices while maintaining the increased display area.
2Ease of manufacture
If the substrate is bent to minimize boundary areas, then the sense of immersion is improved, but the structural strength may be compromised
Solution Approach 1:
The patent applies curvature to the substrate by forming bent regions at the boundary portions. These bent regions allow the substrate to be flexed and bonded to adjacent devices while maintaining structural integrity. The curved configuration enables the substrate to accommodate the bonding process without compromising overall strength, thereby minimizing visible boundaries while preserving mechanical properties.
3Area of stationary object
If a flexible film and source driver are bonded at the rear surface, then the boundary portions are minimized, but the device complexity increases
Solution Approach 1:
The patent moves the bonding of the flexible film and source driver to the rear surface of the substrate, utilizing the third dimension (depth/thickness) rather than expanding the lateral footprint. This dimensional transition allows the boundary portions to be minimized without increasing the horizontal device complexity, as all additional components are integrated in the vertical dimension at the rear surface.
Data Source
AI summary
A tiled display device includes a plurality of display devices including a plurality of display areas including pixels, and a coupling area between adjacent display areas from among the plurality of display areas. Each of the plurality of display devices includes: a substrate including a first portion configured to support the display area, a second portion extending from the first portion to be bent, and a third portion extending from the second portion, a display layer on the first portion of the substrate and including the pixels, a connection line at an edge of the first portion of the substrate and connected to the plurality of pixels, a pad portion on the third portion of the substrate, a fan-out line on the second portion of the substrate and connected between the pad portion and the connection line, and pattern holes penetrating the second portion of the substrate.