Flexible Display Cover Window with Localized Vibration Transfer
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Solution Overview
Problem
Conventional display devices lack improved sound transfer capability and have significant bezel sizes, which affect the quality of sound and aesthetics.
Innovation Solution
A display device design featuring a stretchable display area with higher flexibility, a normal display area with lesser flexibility, and a vibration member using piezo materials to enhance sound transfer, along with a cover window structure that includes a central and peripheral portion with varying flexibility to minimize vibration loss and bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid cover window is used, then structural strength is improved, but sound transfer capability deteriorates
Solution Approach 1:
The cover window is designed with different flexibility characteristics in different regions: the peripheral portion has higher flexibility to transfer sound vibrations, while the central portion maintains lower flexibility for structural strength. This local differentiation resolves the contradiction between overall strength and local sound transfer capability.
2Stability of the object's composition
If a large bezel is used, then structural stability is improved, but device aesthetics and space utilization deteriorate
Solution Approach 1:
The display device employs a flexible display panel with stretchable display area that can deform without compromising structural integrity. This flexibility allows the device to achieve narrow bezel designs while maintaining structural stability through the inherent properties of the flexible display technology.
3Reliability
If a stretchable display area with high flexibility is used, then sound transfer capability is improved, but structural stability deteriorates
Solution Approach 1:
The display panel is designed with differentiated flexibility: the peripheral display area has high flexibility to transfer sound vibrations effectively, while the central display area maintains lower flexibility for structural stability. This spatial differentiation of mechanical properties resolves the contradiction between sound transfer and structural stability.
4Reliability
If the peripheral portion of the cover window is made flexible, then sound transfer is improved, but manufacturing complexity increases
Solution Approach 1:
The cover window is constructed as a composite structure with different material properties in different regions: the peripheral portion uses materials or structures with higher flexibility for sound transfer, while the central portion uses materials with lower flexibility. This composite approach enables differentiated functionality while maintaining manufacturability through established composite material techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves sound transfer quality and reduces bezel size, enhancing both call quality and aesthetics by maximizing vibration transfer efficiency and minimizing vibration recognition.
Implementation Method 1
a vibration member which transfers sound through vibration, the vibration member disposing the normal display area having the flexibility less than that of the stretchable display area between the central portion of the cover window and the vibration member
Data Source
AI summary
A display device includes a display panel including a display area including: a stretchable display area at which the display panel is stretchable, disposed at an outer edge of the display device, and a normal display area having flexibility less than that of the stretchable display area, the normal display area disposed further from the outer edge of the display device than the stretchable display area; a cover window disposed on the display panel, including a peripheral portion and a central portion which is disposed further from the outer edge of the display device than the peripheral portion; and a vibration member disposing the normal display area having the flexibility less than that of the stretchable display area between the central portion of the cover window and the vibration member along a thickness direction of the display device.