Foldable Display Rotation Geometry for Low-Stress OLED Bending
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Solution Overview
Problem
Foldable display devices face screen failure due to stress during bending processes, which existing technologies have not adequately addressed.
Innovation Solution
A foldable display device design featuring a dual-axes rotation mechanism with casings and a flexible OLED array layer, where the casings are configured to support the display panel with specific rotation centers and distances to minimize stress, utilizing a dual-axes rotation mechanism and linkage mechanism to evenly distribute stress and prevent peeling or fracture during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display panel is bent during folding operation, then the device achieves foldable functionality and compact form factor, but the screen is subjected to stress that causes failure risk
Solution Approach 1:
The patent applies parameter changes by precisely controlling the coordinates of rotation centers (x1, y1) to satisfy specific mathematical relationships. By adjusting these geometric parameters, the invention reduces stress concentration on the flexible display panel during bending, thereby preventing screen failure while maintaining foldable functionality
Solution Approach 2:
The patent introduces rotation centers as intermediary elements that mediate between the folding motion and the flexible display panel. By positioning these rotation centers at specific coordinates that satisfy the given mathematical relationships, the invention creates an optimal stress distribution pattern that protects the screen during bending operations
2Reliability
If the rotation centers are positioned to minimize stress on the display panel, then screen reliability is improved, but the device structure becomes more complex with specific coordinate requirements
Solution Approach 1:
The patent transforms a complex structural design problem into a parameter optimization problem. By defining specific coordinate relationships for the rotation centers (x1, y1 satisfying the given mathematical relationships), the invention simplifies the design process while achieving stress minimization, rather than requiring complex structural modifications
Data Source
AI summary
A foldable display device includes a first casing and a second casing. The first casing is rotatable about a first rotation center, and the second casing is rotatable about a second rotation center. Coordinates of an orthographic projection of the first rotation center on an xoy coordinate plane are (x1, y1), and coordinates of an orthographic projection of the second rotation center on the xoy coordinate plane are (−x1, y1). A predetermined value is defined by a sum of coordinate values x1 and y1, the coordinate value x1 is greater than zero, and the coordinate value y1 is greater than −0.3 millimeter (mm) and less than or equal to one mm.