Flexible Display Bezel Redundant Signal Paths
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Solution Overview
Problem
Flexible display devices face reliability and stability issues due to signal line cracks and disconnections when subjected to stress during bending, leading to defective screen driving.
Innovation Solution
A flexible display device design featuring multiple signal transmission paths in the bezel region, with bypass lines connected via contact holes through insulating layers, ensuring continuous signal delivery even if primary paths are blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single signal line is used to transmit signals in the bezel region, then the device structure is simple, but the signal transmission path may crack or disconnect under bending stress, causing defective screen driving
Solution Approach 1:
The signal transmission function is segmented into multiple independent paths: the original signal line and multiple bypass lines. Each path can independently transmit signals, so if one path cracks or disconnects under bending stress, other paths remain functional and maintain signal transmission reliability.
Solution Approach 2:
Bypass lines are pre-configured in the bezel region as backup signal transmission paths before any cracking or disconnection occurs. These bypass lines remain inactive during normal operation but automatically become active when the primary signal line fails, providing beforehand protection against signal transmission failures.
2Reliability
If bypass lines are added to create redundant signal paths, then reliability under bending stress is improved, but the device structure becomes more complex
Solution Approach 1:
The bypass lines are localized specifically in the bezel region where bending stress concentrates, rather than distributing complexity across the entire display device. This targeted approach provides reliability improvement where it is most needed while minimizing overall structural complexity.
Solution Approach 2:
The bypass lines are positioned at different spatial locations and orientations within the bezel region, creating redundant signal transmission paths in multiple dimensions. This dimensional diversification ensures that cracking in one direction or location does not affect all signal transmission paths simultaneously.
3Reliability
If multiple bypass contact holes are provided to connect bypass lines, then redundant signal paths are ensured, but manufacturing precision requirements increase
Solution Approach 1:
Multiple bypass contact holes are provided in an excessive manner, meaning more contact holes are created than the absolute minimum required for single-path connectivity. This redundancy in contact holes ensures that even if some contact holes fail to form properly or become blocked, sufficient conductive paths remain to maintain signal transmission through the bypass lines.
Data Source
AI summary
A flexible display device including a substrate having an active region in which an input image is implemented and a bezel region outside the active region; a signal line (or an electrode) extending from the bezel region and transmitting a signal (or a voltage) to the active region; and a first bypass line provided above or below the signal line with one or more insulating layers interposed therebetween in the bezel region, wherein the first bypass line is connected to the signal line via a first bypass contact hole penetrating through the one or more insulating layers and receives the same signal as that of the signal line, and wherein the first bypass contact hole is provided as at least two bypass contact holes.