Foldable Display Device Shutter and Shielding Layers
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Solution Overview
Problem
Foldable display devices face challenges in reliability due to tensile and compressive stresses when folded, requiring innovative designs to maintain functionality and durability.
Innovation Solution
A foldable display device design featuring a housing with distinct folding and unfolding areas, a dual-sided display panel, a shutter layer for light control, and a shielding layer to manage stress and enhance reliability, allowing for image display on both sides using a single panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a foldable display device uses a single display panel for both inside and outside display, then device miniaturization is achieved, but tensile and compressive stresses during folding reduce reliability
Solution Approach 1:
The housing is divided into distinct functional areas: a first unfolding area for display, a second unfolding area for additional display or interaction, and a folding area that accommodates the bending stress. This segmentation allows each area to be optimized for its specific function while managing the mechanical stresses of folding through dedicated structural zones.
Solution Approach 2:
Different regions of the display device are assigned different properties: the first unfolding area contains the display panel with shutter layer for light control, the second unfolding area has a shielding layer for light blocking, and the folding area is designed to handle mechanical stress. This local differentiation optimizes each region for its specific function while maintaining overall device reliability during folding operations.
2Adaptability or versatility
If a shutter layer and shielding layer are added to control light transmission, then display functionality is improved, but device complexity increases
Solution Approach 1:
The shutter layer is integrated directly onto the display panel in the first unfolding area, combining the display function with the light control function in a single integrated structure. The shielding layer is similarly integrated into the second unfolding area of the housing. This merging eliminates the need for separate, standalone light control mechanisms, thereby reducing overall device complexity while maintaining versatile light control capabilities.
Solution Approach 2:
The shutter layer serves multiple functions: it controls light transmission for display visibility, enables the device to function in different display modes (inside/outside display), and works in conjunction with the shielding layer to manage light blocking. This multi-functionality reduces the need for additional separate components, thereby controlling device complexity while enhancing adaptability.
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 enhances product reliability and miniaturization by effectively managing stress and maintaining functionality, reducing vulnerability to external impact while enabling image display on both sides of the device.
Implementation Method 1
a display panel which is disposed in the first unfolding area and the second unfolding area and provides light through a first surface and a second surface opposite the first surface
Implementation Method 2
a shutter layer which is disposed on the display panel in the first unfolding area and determines whether to transmit light
Implementation Method 3
a shielding layer which is disposed in the second unfolding area and blocks the light
Data Source
AI summary
Provided is a foldable display device. The foldable display device includes a housing comprising a folding area, a first unfolding area adjacent to the folding area, and a second unfolding area adjacent to the folding area and under the first unfolding area; a display panel located at the first unfolding area and the second unfolding area that is capable of providing light through a first surface and a second surface opposite the first surface; a shutter layer on the display panel in the first unfolding area that controls whether light is transmitted; a window on the shutter layer; and a shielding layer located at the second unfolding area that is capable of blocking the light.