Flexible Wiring Routing for Narrow Bezel Display Devices
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Solution Overview
Problem
Existing display devices face challenges in achieving a narrow bezel due to the presence of wiring, driving circuits, and sealants in the non-display areas, which hinder the reduction of bezel width and affect aesthetic design and panel spacing.
Innovation Solution
The display device incorporates a first panel with a thin film transistor and a flexible layer in both display and non-display areas, featuring an elongated wiring unit and second flexible layer that extends beyond the substrate edge, allowing the wiring unit to connect the driving circuit and bend along the substrate edge, with a passivation member and buffer layer for enhanced structural integrity and reduced thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If wiring, driving circuit and sealant are placed in the non-display area, then the display device can function properly, but the bezel width increases
Solution Approach 1:
The patent applies dimensionality change by extending the flexible layer and wiring unit beyond the substrate edge in the non-display area, allowing components to be positioned in three-dimensional space rather than constrained to a two-dimensional plane. This enables the wiring to route around the substrate edge, reducing the horizontal bezel width while maintaining proper electrical connections.
Solution Approach 2:
The patent utilizes a flexible layer that can be elongated and bent along the substrate edge. This flexible film allows the wiring unit to follow a curved path around the substrate perimeter, enabling compact bezel design while maintaining electrical connectivity between the driving circuit and display area.
2Length of stationary object
If the flexible layer is elongated beyond the substrate edge, then the bezel width is reduced, but the structural integrity may be compromised
Solution Approach 1:
The flexible layer is designed as a thin film that can be elongated beyond the substrate edge while maintaining structural integrity. The material properties and thickness of the flexible layer are optimized to provide sufficient mechanical strength for the extended portion to be bent along the substrate edge without breaking or detaching.
Solution Approach 2:
The extended portion of the flexible layer and wiring unit is bent along a curved path following the substrate edge rather than a sharp angle. This curvature distribution reduces stress concentration and prevents structural failure at the bend points, maintaining integrity while achieving narrow bezel.
3Length of stationary object
If the wiring unit is extended and bent along the substrate edge, then the bezel width is reduced, but electrical shorts may occur
Solution Approach 1:
The flexible layer serves as an intermediary between the substrate and the wiring unit, providing electrical insulation and mechanical support. This intermediate layer prevents direct contact between conductive elements that might cause shorts, while still allowing the wiring to be extended and bent along the substrate edge for narrow bezel design.
Data Source
AI summary
A display device includes: first and second panels facing each other, each of which includes a display area and a non-display area; and a driving unit connected to the first panel. The first panel includes a first flexible layer on a first substrate and in the display and non-display areas; a thin film transistor on a portion of the first flexible layer in the display area, the thin film transistor including gate, source an drain electrodes and a semiconductor layer; a wiring unit on a portion of the first flexible layer in the non-display area; and a second flexible layer on the wiring unit in the non-display area, the second flexible layer in the non-display area being elongated to define a portion thereof extended further than a terminal edge of the first substrate. The wiring unit connects the driving circuit unit to the first panel.