Transparent OLED Device Dual Carrier Substrate Segmentation
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Solution Overview
Problem
Conventional OLEDs face challenges in achieving high brightness and long operational lifetime while maintaining transparency, especially in applications like signage where active area is reduced, and require complex fabrication and increased cost due to the need for multiple emissive layers and precise patterning.
Innovation Solution
The use of two carrier substrates, each emitting different portions of the visible spectrum, allows for a full-color transparent display with higher brightness and reduced patterning requirements, enabling improved fill-factor and transparency by eliminating the need for precise alignment and patterning of three colors at the pixel level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple emissive layers are used to achieve full-color emission, then color saturation is improved, but device complexity and fabrication difficulty increase
Solution Approach 1:
The display device is divided into two separate carrier substrates, each containing OLEDs that emit different portions of the visible spectrum. This segmentation allows each substrate to be fabricated independently with simpler patterning requirements, while the combined output achieves full-color emission capability.
Solution Approach 2:
The patent transitions from a single-plane emission architecture to a stacked multi-plane architecture. By arranging OLEDs on two separate carrier substrates in a stacked configuration, the system achieves full-color emission without requiring complex lateral patterning within a single plane.
2Illumination intensity
If active area is reduced for signage applications, then transparency is improved, but brightness decreases
Solution Approach 1:
The patent combines the emission output from two separate carrier substrates, each contributing different portions of the visible spectrum. This merging of emissions achieves full-color transparency while maintaining high brightness, as both substrates can be optimized for their respective emission ranges without competing for the same active area.
3Manufacturing precision
If precise patterning is required for multiple colors at pixel level, then color accuracy is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the full-color emission requirement into two separate carrier substrates, each handling different portions of the spectrum, the patent reduces the patterning precision required on each individual substrate. This segmentation simplifies manufacturing while maintaining overall color accuracy through the combined output.
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
This approach enables transparent displays with higher brightness and longer operational lifetimes, reducing fabrication complexity and cost by simplifying the patterning process and allowing for one-sided or two-sided emission, suitable for signage applications.
Implementation Method 1
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 2
Transparent OLEDs are becoming an increasingly interesting technology for use in applications such as flat panel displays, illumination, and backlighting
Data Source
AI summary
Display panels and other devices are provided that include emissive devices disposed on two carrier substrates and arranged to achieve a desired emission profile and transparency. Each carrier substrate includes OLED devices of a selected color which may be used to provide one- or two-sided imaging based on emission from devices on each carrier substrate.