Flexible Inorganic Display Structure Without Mesa Etching
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Solution Overview
Problem
Current flexible display technologies, particularly OLED displays, face challenges in achieving high resolution and luminance comparable to inorganic LED displays, with limitations in pixel integration density and light efficiency due to alignment errors and mesa etching processes.
Innovation Solution
A flexible high-resolution display apparatus is developed with a monolithic integration structure of a driving layer and a light emitting unit, using an organic transparent substrate and inorganic materials, featuring a thin film structure with isolated subpixel emission and color conversion layers, which enhances light efficiency and resolution without the need for mesa etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays are used for flexible applications, then flexibility is achieved, but luminance and light efficiency are reduced compared to inorganic LED displays
Solution Approach 1:
The patent combines organic materials (flexible substrate, organic driving layer) with inorganic materials (inorganic light emitting unit) to create a hybrid display structure that achieves both flexibility and high luminance. The inorganic light emitting unit provides high light efficiency while the organic substrate maintains flexibility.
2Manufacturing precision
If conventional OLED manufacturing processes are used, then organic substrate flexibility is maintained, but pixel integration density and resolution are limited due to alignment errors and mesa etching
Solution Approach 1:
The patent removes the mesa etching process from the manufacturing workflow. The isolated structure is formed through selective growth and deposition techniques rather than etching, eliminating the alignment errors and process complexity associated with traditional mesa etching while achieving high pixel integration density.
3Productivity
If inorganic light emitting units are integrated with organic substrates, then light efficiency and resolution are improved, but manufacturing process complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-forming the inorganic light emitting unit with its isolated structure on a separate substrate before integration with the organic substrate. This preliminary preparation simplifies the final integration process and reduces manufacturing complexity while maintaining high light efficiency.
Solution Approach 2:
The patent divides the display into separate functional modules: an organic substrate with driving layer and an inorganic light emitting unit with isolated structure. This segmentation allows each module to be optimized and manufactured independently, then integrated together, reducing overall manufacturing process complexity.
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 achieves high-resolution, flexible displays with improved light efficiency and reduced pixel size, enabling applications in wearable and rollable devices while maintaining flexibility and high luminance.
Implementation Method 1
an active layer, and a second semiconductor layer. The active layer may include an inorganic material and may emit light, for example, in the blue region
Implementation Method 2
an organic transparent substrate. The organic transparent substrate may include at least one of polyimide, polymethyl methacrylate (PMMA), plexiglass, polyethylene terephthalate (PET), transparent polypropylene, polycarbonate, polyethylene naphthalate, polyarylate (PAR), polyetherimide
Data Source
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AI summary
Provided are a display apparatus and a method of manufacturing the display apparatus. The display apparatus includes a pixel electrode configured to supply power to a subpixel; a common electrode; an organic transparent substrate; a driving layer provided on the organic transparent substrate and electrically connected to the pixel electrode, the driving layer including a driving device configured to control power on-off of the subpixel; and a light emitting unit provided on the driving layer and including an inorganic material, the light emitting unit including a first semiconductor layer, an active layer, and a second semiconductor layer.