Stretchable Display Pixel Layout to Reduce Mura When Stretched
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Solution Overview
Problem
Stretchable display devices face issues with image quality deterioration and mura artifacts, such as a lattice pattern, when stretched, due to non-uniform stretching and increased distance between light-emitting elements.
Innovation Solution
A stretchable display device is designed with a specific structure that includes a lower substrate with light-emitting elements disposed on it, and additional sub-pixels in flexible regions that emit light when stretched, helping to maintain image quality and reduce mura artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a stretchable display device is stretched, then flexibility and shape adaptability are improved, but image quality deteriorates and mura artifacts appear due to non-uniform stretching and increased distance between light-emitting elements
Solution Approach 1:
The display device is divided into multiple rigid regions connected by flexible regions. Each rigid region contains light-emitting elements arranged in a matrix, while the flexible regions allow stretching without containing light-emitting elements. This segmentation enables the display to be stretched while maintaining image quality in the rigid regions.
Solution Approach 2:
Different regions of the display device have different properties: rigid regions maintain structural stability and contain light-emitting elements for high-quality image display, while flexible regions provide stretchability and connect the rigid regions. This local differentiation allows the display to achieve both shape adaptability and image quality.
2Adaptability or versatility
If the distance between light-emitting elements increases when stretched, then flexibility is improved, but aperture ratio is reduced and image quality deteriorates
Solution Approach 1:
The display is segmented into rigid regions with light-emitting elements and flexible regions without light-emitting elements. When stretched, only the flexible regions expand, while the rigid regions maintain their internal structure and aperture ratio, thus preserving image quality while providing flexibility.
3Manufacturing precision
If additional sub-pixels are disposed in flexible regions, then mura artifacts are reduced and image quality is maintained, but device complexity increases
Solution Approach 1:
Additional sub-pixels are selectively disposed only in the flexible regions, which are areas that would otherwise contribute to mura artifacts during stretching. This local addition compensates for the non-uniform stretching effects specifically where needed, without adding complexity to the entire display structure.
Data Source
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AI summary
The present disclosure relates to a stretchable display device (100, 400, 600, 800). According to an embodiment of the present disclosure, a stretchable display device (100, 400, 600, 800) includes: a lower substrate (110) comprising a plurality of first areas (Al) on which a plurality of sub-pixels (SPX) is defined and spaced apart from one another, a plurality of second areas (A2) in which a plurality of connection lines (150) connecting between adjacent ones of the first areas (Al) is disposed, and a plurality of third areas (A3) other than the first areas (Al) and the second areas (A2); a plurality of additional sub-pixels (SPXA) disposed in the third areas (A3), respectively; and a plurality of piezoelectric patterns (PP) electrically connected to the additional sub-pixels (SPXA), respectively. The stretchable display device (100, 400, 600, 800) can suppress deterioration of image quality when it is stretched.