Flexible Display Fabrication Using Semiconductor Light Emitting Devices
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Solution Overview
Problem
Current display technologies, such as LCDs and AMOLEDs, face challenges including slow response time, limited flexibility, short lifespan, and low yield, while semiconductor light emitting devices struggle to achieve high definition and flexibility in display devices.
Innovation Solution
A method for fabricating a display device using a semiconductor light emitting device with a flexible substrate and a phosphor layer formed using light emitted from the semiconductor light emitting devices, enabling high definition and flexibility through a novel fabrication process that includes a conductive adhesive layer and anisotropic conductive films for electrical connection and a phosphor layer formed by curing photosensitive materials with emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semiconductor light emitting devices are used to achieve flexibility, then flexibility is improved, but manufacturing precision and high definition capabilities deteriorate
Solution Approach 1:
The display device is divided into multiple sub-pixels (red, green, blue) that are arranged in a matrix pattern. Each sub-pixel contains a semiconductor light emitting device with specific phosphor materials, allowing the overall display to achieve high definition through precise spatial segmentation while maintaining flexibility at the device level
Solution Approach 2:
Different phosphor materials are selectively applied to different regions (sub-pixels) of the semiconductor light emitting device. Red phosphor, green phosphor, and blue phosphor are distributed in specific patterns to create distinct color regions, enabling high definition color display while the entire device maintains flexible characteristics
2Manufacturing precision
If conventional LCD technology is used, then manufacturing precision is maintained, but response time deteriorates
Solution Approach 1:
The patent replaces the liquid crystal mechanical rotation system with semiconductor light emitting devices that directly emit light through electroluminescence. This substitution eliminates the slow mechanical response of LCD molecules and achieves fast response times while maintaining precise control over light emission through electrical signals
3Speed
If AMOLED technology is used, then response time is improved, but reliability and lifespan deteriorate
Solution Approach 1:
The patent changes the material parameters from organic compounds (AMOLED) to inorganic semiconductor materials with phosphor coatings. This parameter change provides faster response times comparable to AMOLED while significantly improving reliability and lifespan through the superior stability and durability of semiconductor materials
4Manufacturing precision
If external exposure devices are used to cure phosphor layers, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The semiconductor light emitting devices are used to emit light that cures the photosensitive phosphor materials themselves. This self-service approach eliminates the need for separate external exposure devices, reducing production process complexity while maintaining precise phosphor layer formation through the devices' own light emission
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 provides a flexible display device with high definition capabilities, improved response time, and extended lifespan by utilizing semiconductor light emitting devices with a phosphor layer formed using self-emitted light, eliminating the need for external exposure devices and reducing production costs.
Implementation Method 1
light emitting diodes (LEDs) are light emitting devices for converting an electrical current to light
Implementation Method 2
a phosphor layer formed using light emitted from the semiconductor light emitting devices
Data Source
Figure 1~2
Figure 3a~5a
Figure 5b~5c
AI summary
A display device including a wiring substrate having a first substrate layer and a second substrate layer, a conductive adhesive layer configured to cover the wiring substrate, a plurality of semiconductor light emitting devices coupled to the conductive adhesive layer and electrically connected to a first electrode and a second electrode. Further, the first electrode is disposed on the first substrate layer, and the second substrate layer has one surface facing the conductive adhesive layer and the other surface covering the first electrode, and an auxiliary electrode electrically connected to the first electrode and the second electrode are disposed on one surface of the second substrate layer.