Stretchable Display Layout for Red Light Conversion Efficiency
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Solution Overview
Problem
Existing display devices lack efficient light conversion and light emitting diode configurations that enhance red light emission and flexibility, particularly in stretchable and flexible display devices.
Innovation Solution
A display device design featuring a lower substrate with rigid and malleable areas, where light emitting diodes and light conversion layers are strategically positioned to improve light conversion efficiency, with reflective layers enhancing red light emission and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a light conversion layer is formed to have a long length to improve light conversion efficiency, then the light conversion efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The patent transitions from increasing light conversion efficiency through thickness (vertical dimension) to increasing it through length (horizontal dimension). The light conversion layer is extended along the first direction to a length that is 10 times or more its thickness, utilizing horizontal spatial extension rather than vertical stacking to achieve higher conversion efficiency while avoiding increased device complexity.
Solution Approach 2:
The patent changes the geometric parameters of the light conversion layer by setting its length in the first direction to be 10 times or more its thickness, and positioning it adjacent to the light emitting diode. This parameter change optimizes the interaction path between emitted light and the conversion layer, improving efficiency without adding structural complexity.
2Productivity
If a reflective layer is added to improve red light emission efficiency, then the light conversion efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The reflective layer is merged with the light conversion layer to form a combined structure. The reflective layer is positioned at the bottom of the light conversion layer, creating an integrated component that serves dual functions: converting light wavelength and reflecting light to enhance conversion efficiency, thereby reducing overall device complexity.
Solution Approach 2:
The combined light conversion layer and reflective layer structure performs multiple functions simultaneously: the light conversion layer converts blue light to red light, while the reflective layer reflects both blue and red light back into the conversion layer to enhance conversion efficiency. This multi-functionality improves red light emission without proportionally increasing device complexity.
3Productivity
If light emitting diodes and light conversion layers are formed in rigid areas, then the light conversion efficiency is improved, but the flexibility of the display device is reduced
Solution Approach 1:
The display device is segmented into rigid areas and flexible areas. The light emitting diodes and light conversion layers are positioned in rigid areas where high light conversion efficiency is required, while the flexible areas maintain their elasticity for bending and stretching. This spatial segmentation allows the device to achieve both high performance and flexibility.
Solution Approach 2:
Different areas of the substrate are assigned different mechanical properties: rigid areas for optimal light conversion performance and flexible areas for bendability. The light conversion components are localized to rigid areas, allowing the flexible areas to deform without compromising the optical performance of the rigid regions.
4Productivity
If the light conversion layer is extended to improve conversion efficiency, then the light conversion efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light conversion layer is extended to an excessive length relative to its thickness (10 times or more), creating a configuration where even with manufacturing tolerances, sufficient interaction between light and the conversion layer is guaranteed. This partial extension beyond the minimum required length provides a margin that compensates for positioning variations during manufacturing.
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 red light conversion efficiency and flexibility by forming light emitting diodes and conversion layers in specific areas, allowing for enhanced display performance in stretched or bent states.
Implementation Method 1
light from the first light emitting diode is reflected to the light conversion layer disposed on a side portion of the first light emitting diode using the first reflective layer to improve a light conversion efficiency of the light conversion layer
Implementation Method 2
a light conversion layer disposed opposite to one side surface of the first light emitting diode
Data Source
AI summary
A display device in one example includes a lower substrate having a plurality of rigid areas disposed to be spaced apart from each other and a malleable area enclosing the plurality of rigid areas, a plurality of first plate patterns disposed in the plurality of rigid areas of the lower substrate, and a plurality of first sub pixels partially disposed on the plurality of first plate patterns. Each of the plurality of first sub pixels includes a first light emitting diode, a light conversion layer facing one side surface of the first light emitting diode, and a first reflective layer facing an opposite surface of one side surface of the first light emitting diode.