Flexible Micro LED Display Monolithic Integration for High Resolution
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Solution Overview
Problem
Current flexible display technologies, such as OLEDs, face challenges in achieving high resolution and luminance comparable to inorganic LED displays, particularly due to limitations in subpixel integration and light efficiency.
Innovation Solution
A flexible high resolution display apparatus is developed with a monolithic integration structure, featuring a driving layer and a light emitting unit with an inorganic material-based micro LED array, including a first and second semiconductor layer, and a current blocking layer, integrated on an organic transparent substrate, which enhances electrical connection and reduces subpixel size for improved resolution and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED displays are used for flexible applications, then flexibility is achieved, but luminance and resolution are insufficient compared to inorganic LED displays
Solution Approach 1:
The patent employs a hybrid structure combining organic materials (flexible substrate, encapsulation layers) with inorganic materials (micro LED light emitting elements). This composite approach allows the display to achieve both flexibility from the organic substrate and high luminance from the inorganic micro LED elements, resolving the contradiction between flexibility and luminance performance
2Manufacturing precision
If subpixel size is reduced to increase resolution, then pixel integration degree increases, but manufacturing complexity and electrical connection difficulty increase
Solution Approach 1:
The patent integrates the driving layer and light emitting unit into a monolithic structure where the driving device is directly formed on the flexible substrate and electrically connected to the micro LED elements. This merging of driving and light emitting functions into a single integrated layer simplifies the electrical connection structure and reduces manufacturing complexity while achieving high pixel integration degree
3Productivity
If inorganic micro LED array is integrated on organic transparent substrate, then light efficiency and resolution improve, but substrate removal and device integration complexity increase
Solution Approach 1:
The patent forms the driving layer and light emitting unit on a temporary epitaxial substrate first, allowing for precise fabrication of the micro LED array with high light efficiency. The epitaxial substrate is then removed and the completed light emitting unit is transferred to the final flexible substrate. This preliminary fabrication approach enables high precision manufacturing while simplifying the overall integration process
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 and improved light efficiency by minimizing subpixel size and eliminating the need for mesa etching, allowing for flexible and rollable display applications while maintaining excellent electrical connection characteristics.
Implementation Method 1
an active layer, and a second semiconductor layer... the active layer including an inorganic material... Transform Electrical Energy to Optical Energy
Data Source
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.