Stretchable Display Substrate Protrusions Luminance Control
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Solution Overview
Problem
Conventional stretchable display apparatuses experience significant variations in luminance when stretched, due to changes in pixel density and light emission intensity, which affects image quality and usability.
Innovation Solution
A stretchable display apparatus featuring a substrate with protrusions having inclined surfaces, where LEDs are strategically placed to maintain consistent luminance by varying the inclination angles based on the stretching degree, and including thin film transistors and a stretchable film to ensure uniform light distribution and pixel functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LEDs are disposed on a flat substrate, then the structure is simple, but luminance varies significantly when stretched
Solution Approach 1:
The substrate is segmented into multiple protrusions with inclined surfaces, where LEDs are disposed on different surfaces (first, second, and third inclined surfaces). This segmentation allows different LED groups to be activated based on stretching degree, resolving the luminance consistency issue without requiring a completely complex substrate structure.
Solution Approach 2:
The substrate structure incorporates dynamic elements including protrusions with inclined surfaces that change orientation during stretching, and a control unit that dynamically activates different LED groups based on the stretching degree. This dynamic adaptation maintains luminance consistency while keeping the overall structure relatively simple.
2Illumination intensity
If multiple LED groups are activated based on stretching degree, then luminance consistency is maintained, but device complexity increases
Solution Approach 1:
The control unit automatically determines which LED groups to activate based on the stretching degree of the substrate, without requiring external intervention or complex control mechanisms. The system self-regulates by detecting the stretching state and activating appropriate LED groups, maintaining luminance consistency while minimizing control complexity.
Solution Approach 2:
The system changes operational parameters (which LED groups are active) based on the stretching degree parameter. By monitoring substrate deformation and adjusting LED activation accordingly, the system maintains luminance consistency through parameter adaptation rather than complex mechanical or structural changes.
3Illumination intensity
If LEDs are disposed on inclined surfaces of protrusions, then luminance variation is reduced, but manufacturing complexity increases
Solution Approach 1:
The substrate is divided into discrete protrusions with inclined surfaces, which can be fabricated using standard semiconductor or PCB manufacturing techniques. This segmentation approach allows for modular manufacturing and assembly, reducing the overall manufacturing complexity despite the inclined surface geometry.
Solution Approach 2:
Instead of creating complex three-dimensional curved surfaces, the invention uses polyhedral protrusions with flat inclined surfaces. This dimensional simplification allows LEDs to be mounted on planar surfaces that still provide the necessary angular distribution for luminance consistency, greatly easing manufacturing compared to true curved surfaces.
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 minimizes luminance variation and maintains consistent image quality across different stretching states, ensuring the display apparatus performs effectively regardless of the stretched degree, with LEDs operating as intended to provide stable and uniform illumination.
Implementation Method 1
each of the protrusions has an inclined surface, and at least some of the LEDs are disposed on the protrusions
Data Source
AI summary
A display apparatus includes a plurality of light-emitting diodes (“LED”s); a stretchable substrate including a flat portion, and a plurality of protrusions protruding from the flat portion, where each of the protrusions has inclined surfaces, and at least some of the light-emitting diodes are disposed on the protrusions; and a plurality of thin film transistors in the stretchable substrate and connected to the LEDs.