Rollable Display Dummy Region Stress Distribution
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Solution Overview
Problem
Rollable display apparatuses face defects at pixels due to stress and bending issues when rolled, leading to potential damage and defects in the flexible display panel.
Innovation Solution
Incorporating a flexible display panel with a display region and a dummy region connected in one direction, along with a housing that includes a main and sub-housing with specific cross-sectional shapes, allowing the flexible display panel to be rolled around the outside surface while distributing stress through dummy portions, preventing damage at pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible display panel is rolled on the housing, then portability is improved, but stress and nicks occur in the display panel causing pixel defects
Solution Approach 1:
The flexible display panel is divided into two distinct regions: a display region containing functional pixels and a dummy region without pixels. This segmentation allows the dummy region to absorb stress and deformation during rolling, protecting the display region from damage while maintaining portability.
Solution Approach 2:
The dummy region is pre-configured as a stress-absorbing zone before rolling occurs. By having this protective region in place beforehand, the structure anticipates and mitigates the harmful effects of rolling stress on the display pixels, preventing defects before they occur.
2Area of moving object
If the flexible display panel is made wider to increase display area, then the display area is improved, but the panel becomes more susceptible to stress and bending damage
Solution Approach 1:
Different regions of the flexible display panel are given different properties: the display region maintains high functional density with pixels, while the dummy region has no pixels and is specifically designed to be more compliant and stress-absorbing. This local differentiation allows the overall panel to be larger without proportionally increasing vulnerability to bending damage.
Solution Approach 2:
The dummy region acts as an intermediary buffer zone between the rigid housing and the fragile display region. It mediates the mechanical stress by absorbing deformation energy, thereby protecting the display pixels from direct exposure to bending forces while allowing the panel to maintain a larger overall area.
Data Source
AI summary
A rollable display apparatus includes a flexible display panel and a housing. The flexible display panel includes a display region which displays an image and a dummy region which does not display an image. The dummy region is connected to a side of the display region, and the dummy region and the display region are disposed in one direction. The flexible display panel is rollable around an outside surface of the housing. The dummy region includes a first dummy portion fixed in the housing and a second dummy portion connected to the first dummy portion. The second dummy portion is wrapped around the housing.