Hybrid MEMS OLED Display with Blue LED Backlight and Shutter Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional OLED displays face issues with color break-up due to high switching speeds required for RGB backlights, particulate and scaling problems in patterning technologies, efficiency and lifetime issues, and deep blue efficiency and image sticking, necessitating improvements in power consumption, brightness, lifetime, and optical performance.
Innovation Solution
A hybrid display architecture incorporating a blue LED backlight layer, shutter elements, a frontplane with multiple sub-pixels, and a backplane, where the shutter elements are positioned between the backlight and the frontplane or backplane, utilizing MEMS shutters and unpatterned yellow OLEDs with color filters to form red and green sub-pixels, allowing for local dimming of blue light and amplitude or pulse-width modulation for power savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high switching speeds are used for RGB backlights, then color saturation is improved, but color break-up occurs and visual artifacts appear
Solution Approach 1:
The display is divided into separate red, green, and blue sub-pixel regions that are spatially segmented rather than using sequential color backlighting. Each sub-pixel emits its own color, eliminating the need for high-speed switching and preventing color break-up artifacts while maintaining color saturation.
Solution Approach 2:
The invention eliminates periodic switching actions by using continuous emission from each color sub-pixel. Instead of periodically switching between RGB backlights, each sub-pixel continuously emits its designated color, removing the source of visual artifacts while preserving color quality.
2Ease of manufacture
If conventional patterning technologies are used, then manufacturing process is simplified, but particulate and scaling problems occur
Solution Approach 1:
The invention replaces mechanical patterning methods with solution-based deposition techniques. Organic emissive layers are deposited using solution processing rather than vacuum deposition through masks, eliminating particulate contamination and scaling issues while maintaining manufacturing simplicity.
Solution Approach 2:
The use of organic composite materials that can be processed in solution form allows for high-resolution patterning without the limitations of conventional inorganic materials. These organic materials can be deposited with precise spatial control while avoiding the particulate and scaling problems associated with traditional patterning methods.
3Device complexity
If conventional OLED materials are used, then device fabrication is simplified, but efficiency and lifetime issues occur
Solution Approach 1:
The invention changes the chemical parameters of the emissive materials by using specifically designed organic compounds with improved stability and efficiency characteristics. These parameter changes in material composition maintain fabrication simplicity while significantly extending display lifetime and improving efficiency.
Solution Approach 2:
The use of composite organic materials combining multiple functional components achieves both simplified fabrication and improved performance. These composite materials integrate emissive, transport, and stabilizing functions in a single system that is easier to fabricate than inorganic alternatives while providing superior lifetime and efficiency.
4Illumination intensity
If deep blue OLEDs are used, then color gamut is improved, but efficiency and image sticking problems occur
Solution Approach 1:
The display segments the blue emission function into a dedicated blue backlight layer that illuminates the entire display uniformly. This segmentation allows the blue sub-pixels to achieve high efficiency through the backlight approach while maintaining wide color gamut, avoiding the image sticking and efficiency problems of deep blue OLED materials.
Solution Approach 2:
The invention introduces a blue backlight layer as an intermediary that provides the blue light for all blue sub-pixels. This intermediary approach eliminates the need for inefficient deep blue OLED materials in each pixel while preserving the wide color gamut and high emission efficiency through the backlight mechanism.
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 enhances power consumption, brightness, lifetime, yield, and optical performance by avoiding color break-up issues, improving manufacturing efficiency, and extending display lifetime while maintaining high brightness and color gamut without the need for polarizers.
Implementation Method 1
a blue LED backlight layer
Implementation Method 2
unpatterned yellow OLEDs with color filters
Implementation Method 3
color filters to form red and green sub-pixels
Implementation Method 4
shutter elements, allowing for local dimming of blue light and amplitude or pulse-width modulation
Data Source
AI summary
A hybrid display includes a blue LED backlight layer, at least one shutter element, a frontplane having multiple sub-pixels, and a backplane operatively connected to the frontplane and the at least one shutter element. The backplane and the at least one shutter element are positioned between the backlight layer and the frontplane.