Stretchable Display Rigid Lenses Elastic Refraction
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Solution Overview
Problem
Stretchable display devices face a reduction in pixel-fill factor and subsequent image quality due to increased gaps between pixels when stretched, as the fixed interval between light sources leads to deteriorated image quality.
Innovation Solution
A stretchable display device incorporating a stretchable substrate with a display unit, rigid lenses, and a transparent elastic part, where the transparent elastic part forms convex lens surfaces corresponding to the rigid lenses upon stretching, reducing the apparent gap between pixels by refracting light and increasing the pixel-fill factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the stretchable display device is stretched to increase screen size, then the display area is expanded, but the pixel-fill factor is reduced due to increased gaps between pixels
Solution Approach 1:
The patent applies curvature by forming convex lens surfaces on the transparent elastic part that corresponds to the rigid lenses. When stretched, these convex surfaces refract light to fill the gaps between pixels, maintaining the pixel-fill factor despite the increased display area. The curved surface geometry is specifically designed to redirect light from each pixel to cover the expanded viewing area while filling the spaces between adjacent pixels.
Solution Approach 2:
The patent changes the refractive index parameter by selecting a transparent elastic material whose refractive index differs from that of the rigid lenses. This refractive index difference enables effective light refraction at the interface between the transparent elastic part and the rigid lenses, allowing the convex surfaces to redirect light properly when stretched, thereby maintaining image quality and pixel-fill factor across different display areas.
2Length of moving object
If the interval between light sources is increased during stretching, then the display can be expanded, but image quality deteriorates due to reduced pixel-fill factor
Solution Approach 1:
The convex lens surfaces formed on the transparent elastic part create curved optical paths that redirect light from each light source. When the interval between light sources increases during stretching, these curved surfaces refract light to fill the resulting gaps, ensuring that the illumination intensity and image quality are maintained despite the increased spacing between pixels.
Solution Approach 2:
The transparent elastic part acts as an intermediary optical element between the rigid lenses and the external environment. It mediates the light path by refraction, compensating for the increased interval between light sources. The convex surfaces on this intermediary component redirect light to fill gaps, thereby maintaining image quality even when the display is stretched and the distance between light sources increases.
3Manufacturing precision
If rigid lenses are used to maintain focus, then image quality is improved, but the structure becomes less flexible when stretched
Solution Approach 1:
The patent merges the rigid lenses with the transparent elastic part to create a hybrid optical structure. The rigid lenses provide the necessary optical focusing properties for high image quality, while the transparent elastic part provides flexibility and adaptability during stretching. The convex surfaces formed on the elastic part work in conjunction with the rigid lenses to maintain focus and image quality across different stretched states, combining the advantages of both rigid and flexible components.
Solution Approach 2:
The convex lens surfaces on the transparent elastic part complement the rigid lenses by providing additional optical power and adaptability. When stretched, these curved surfaces dynamically adjust the light paths to maintain proper focus, allowing the rigid lenses to maintain their focusing function while the overall structure remains flexible and adaptable to stretching.
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 solution effectively reduces the gap between pixels when the device is stretched, enhancing image quality by increasing the pixel-fill factor through light refraction, thereby maintaining image quality during expansion.
Implementation Method 1
When being stretched, may form lens surfaces corresponding to the plurality of rigid lenses, respectively... enhancing image quality by increasing the pixel-fill factor through light refraction
Data Source
AI summary
An exemplary embodiment provides a stretchable display device which is stretched in at least one direction. The stretchable display device according to the exemplary embodiment includes a stretchable substrate, a display unit, a plurality of rigid lenses, and a transparent elastic part. The display unit is on the stretchable substrate, and includes a plurality of light sources and a plurality of stretchable electrodes. The rigid lenses are disposed to correspond to the plurality of light sources, respectively. The transparent elastic part encloses the plurality of rigid lenses on the display unit and is stretched along with the stretched substrate and when being stretched, forms lens surfaces corresponding to the plurality of rigid lenses, respectively.