Flexible Display Wiring Layout for Sharp Bend Reliability
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Solution Overview
Problem
Portable electronic devices with flexible displays face issues such as short-circuits and disconnections at sharp bends, leading to defective operation and reduced reliability, along with high power consumption, susceptibility to damage, and limited visibility in varying light conditions.
Innovation Solution
A display device design featuring distinct regions with meandering wirings and no electrodes at bend points, allowing for flexible substrates and integration of reflective and light-emitting elements, enabling high-quality, reliable, low-power, shock-resistant, and lightweight displays with improved visibility across different illuminance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bend portion of the flexible display has a small radius of curvature to reduce device size, then the portability and compactness are improved, but the wiring and electrode in the bend portion easily experience short-circuit or disconnection, leading to defective operation and lowered reliability
Solution Approach 1:
The display device is divided into distinct regions: a non-bending region containing all electrodes and wirings, and a bending region that is electrode-free. This segmentation allows the bending region to flex without compromising wiring integrity, while the non-bending region maintains reliable electrical connections.
Solution Approach 2:
Electrodes are extracted from the bending region and concentrated in the non-bending region. This extraction eliminates the risk of electrode damage during bending, as the bending region contains no electrodes that could short-circuit or disconnect.
2Adaptability or versatility
If the display device uses a flexible substrate to enable bending, then the adaptability and form factor options are improved, but the susceptibility to damage from bending and external impacts increases
Solution Approach 1:
Different regions of the display device have different mechanical properties: the non-bending region maintains structural integrity and rigidity to protect electrodes, while the bending region is designed to be flexible and shock-absorbent. This local differentiation allows the device to bend without damage.
Solution Approach 2:
The bending region acts as a cushioning zone that absorbs external impacts and mechanical stress before they reach the fragile electrode components in the non-bending region, protecting the device from damage.
3Manufacturing precision
If the display device uses active-matrix technology with transistors in each pixel to increase display size and resolution, then the display quality and functionality are improved, but the power consumption increases
Solution Approach 1:
The display device dynamically switches between two operational modes: a high-resolution active-matrix mode for normal viewing, and a low-power reflective mode for extended battery life. This dynamic operation allows the device to optimize between display quality and power consumption based on usage requirements.
Data Source
AI summary
A highly reliable display device is provided. In a flexible display device including at least a first display region and a second display region, at least a portion of a wiring provided in the first display region or the second display region has a meandering shape or a chain-like shape. Since the wiring has a meandering shape or a chain-like shape, a short-circuit, a disconnection, or the like of the wiring due to curving or bending of the display device does not occur easily. The wiring having a meandering shape or a chain-like shape can prevent defective operation, lowered reliability, or the like of the display device.