Stretchable Display Pixel Protection for LED Alignment and Luminance
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Solution Overview
Problem
Existing display devices are prone to damage when stretched repeatedly, and they often suffer from reduced light extraction efficiency and misalignment of light emitting diodes.
Innovation Solution
A stretchable display device is designed with a ductile substrate and a protection layer covering each pixel, which includes a plurality of substrates and connection lines to maintain pixel alignment and enhance light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display device is stretched repeatedly, then the device can be adapted to flexible applications, but the light emitting diodes are damaged and reliability deteriorates
Solution Approach 1:
A protection layer is formed over the light emitting diodes before stretching operations. This protection layer acts as a cushion that absorbs stress and prevents damage to the LEDs during repeated stretching, thereby maintaining reliability while enabling flexible applications
Solution Approach 2:
The protection layer is implemented as a thin film structure that can flex with the substrate during stretching. This thin film protects the rigid LED components while accommodating the flexible deformation of the overall device structure
2Reliability
If a protection layer is added to protect pixels, then stretching reliability is improved, but device complexity increases
Solution Approach 1:
The protection layer serves multiple functions simultaneously: it protects LEDs from damage during stretching, provides a surface for forming connection lines, and assists in light extraction. By combining multiple functions into a single layer, structural complexity is minimized while achieving reliability improvements
3Illumination intensity
If light extraction efficiency is improved, then luminance is enhanced, but device complexity increases due to additional structures
Solution Approach 1:
The protection layer is designed to simultaneously provide mechanical protection and optical functions for light extraction. By integrating these functions into a single component rather than adding separate optical elements, luminance is enhanced without proportionally increasing device complexity
Solution Approach 2:
The protection layer incorporates optical structures such as prisms or microlenses that manipulate light extraction efficiency. These optical features are formed within the protection layer itself, enhancing luminance through optical design rather than adding complex mechanical or electronic components
4Ease of manufacture
If connection lines are extended on first substrates, then manufacturing is simplified, but misalignment of light emitting diodes occurs
Solution Approach 1:
The protection layer is formed first as a reference structure, and then connection lines are formed on the first substrates with reference to this protection layer. This preliminary establishment of the protection layer provides alignment markers that prevent LED misalignment while allowing manufacturing simplification
Solution Approach 2:
The protection layer acts as an intermediary reference structure between the connection lines and the light emitting diodes. By providing a stable, pre-formed structure that both connection lines and LEDs can align to, manufacturing precision is maintained even as manufacturing processes are simplified
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 improves stretching reliability by protecting the light emitting diodes, increases light extraction efficiency for enhanced luminance, and ensures precise alignment of LEDs during the transfer process.
Implementation Method 1
a protection layer covering the plurality of pixels
Implementation Method 2
a ductile substrate that is reversibly expandable and contractible
Implementation Method 3
light extraction efficiency can be improved
Data Source
AI summary
According to an aspect of the present disclosure, the display device includes: a stretchable lower substrate and a plurality of first substrates disposed on the lower substrate. The display device also includes a plurality of second substrates coupling first substrates adjacent to each other among the plurality of first substrates. The display device further includes a plurality of pixels disposed on the plurality of first substrates. The display device also includes a plurality of connection lines disposed on the plurality of second substrates and coupling the plurality of pixels. The display device further includes a protection layer disposed on each of the plurality of pixels.