Hybrid Display Architecture Using GaN Nanorods and OLEDs
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Solution Overview
Problem
Current display technologies face challenges in achieving high brightness and long lifetime with perfect microLED yield, especially in resolving blue color resolution, which is not as easily resolved by the human eye as green or red light, and require close to perfect microLED yield, increasing manufacturing costs.
Innovation Solution
A full-color pixel arrangement using Group III-V inorganic emissive thin films, specifically GaN nanorods, combined with unpatterned yellow OLEDs and color filters or color changing media to produce green and red light, allowing for improved yield and reduced manufacturing complexity by integrating red and green OLED sub-pixels with lower resolution blue microLEDs, and using printed QNED technology for blue light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microLEDs are used to achieve high brightness and long lifetime, then display performance is improved, but manufacturing yield becomes difficult to achieve perfectly, especially for blue color
Solution Approach 1:
The patent changes the material parameter from organic OLED materials to inorganic microLED materials, which fundamentally alters the emission mechanism and enables higher brightness and longer lifetime while accepting lower manufacturing yield for blue sub-pixels
Solution Approach 2:
The patent applies partial action by using microLEDs only for blue sub-pixels where high performance is most needed, while using OLEDs for red and green sub-pixels, thereby achieving overall display performance without requiring perfect yield across all color channels
2Manufacturing precision
If perfect microLED yield is required for blue color resolution, then blue color quality is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent applies local quality by providing different levels of performance for different color sub-pixels: high-performance microLEDs for blue where resolution is less critical to human vision, and high-yield OLEDs for red and green where color accuracy is more important, thereby reducing overall manufacturing cost
3Illumination intensity
If microLEDs are used for blue sub-pixels, then brightness and lifetime are improved, but device complexity increases due to hybrid architecture
Solution Approach 1:
The patent segments the display into different technological zones: microLED technology for blue sub-pixels and OLED technology for red and green sub-pixels. This segmentation allows each technology to be optimized for its specific function while managing overall device complexity through modular integration
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 results in a high brightness, long lifetime display with reduced manufacturing costs and improved yield, as the human eye has lower resolution for blue color, allowing for compensation of non-functional blue sub-pixels and redundancy schemes to enhance overall display performance.
Implementation Method 1
A full-color pixel arrangement using Group III-V inorganic emissive thin films, specifically GaN nanorods, combined with unpatterned yellow OLEDs and color filters or color changing media to produce green and red light
Implementation Method 2
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Implementation Method 3
The same technique can also be used with OLEDs. The white OLED can be either a single EML device or a stack structure. Color may be measured using CIE coordinates
Data Source
AI summary
Embodiments of the disclosed subject matter provide a full-color pixel arrangement for a full-color display is provided, the arrangement having a plurality of pixels, with each pixel including a first sub-pixel comprising a Group III-V inorganic emissive thin film configured to emit light of a first color, where there is at least one first sub-pixel per pixel of the full-color pixel arrangement. Each pixel may include an organic second sub-pixel and an organic third sub-pixel that are configured to emit light of a different color than the first color.