Hybrid Inorganic Organic Micro LED Chip for Display Efficiency
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Solution Overview
Problem
Conventional LCD and AMOLED displays face challenges with high power consumption and limited battery life due to low light efficiency, and the integration of thousands of micro LEDs with pixel driver circuitry is complex.
Innovation Solution
An integrated multi-color micro-LED display chip is developed, where arrays of different color micro LEDs are integrated with corresponding driver circuitry, with inorganic micro LEDs used for blue pixels and organic micro LEDs for red and green pixels, allowing for efficient color production by selecting the best technology for each color based on efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LCD or AMOLED displays are used, then display functionality is achieved, but power consumption is high and battery life is limited
Solution Approach 1:
The display is segmented into multiple sub-pixels, each containing a hybrid stack of inorganic and organic LEDs. This segmentation allows selective activation of different LED types based on color requirements, optimizing power consumption for each sub-pixel independently while extending overall battery life.
2Use of energy by moving object
If inorganic micro LEDs are used for all pixels, then light efficiency is improved, but integration complexity with driver circuitry increases significantly
Solution Approach 1:
Different LED types are assigned to different sub-pixels based on local color requirements. Inorganic LEDs are used where high efficiency is critical, while organic LEDs are used where flexibility and easier integration are beneficial. This local differentiation optimizes both light efficiency and integration complexity.
Solution Approach 2:
A hybrid stack combining inorganic and organic LEDs is created within each sub-pixel. This composite structure leverages the high efficiency of inorganic LEDs and the integration advantages of organic LEDs, achieving both high light efficiency and reduced integration complexity.
3Use of energy by moving object
If hybrid stacks with both inorganic and organic LEDs are used in each sub-pixel, then light efficiency is enhanced and power consumption is reduced, but device structure becomes more complex
Solution Approach 1:
Inorganic and organic LEDs are merged into a hybrid stack within each sub-pixel. This combining allows the system to achieve high light efficiency from inorganic LEDs while utilizing the flexibility and easier integration properties of organic LEDs, ultimately reducing overall device complexity despite the hybrid structure.
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 light efficiency, reduces power consumption, and simplifies the integration of micro LEDs, leading to improved battery life and display performance by combining the advantages of inorganic and organic LEDs in a single chip.
Implementation Method 1
inorganic micro LEDs are used for blue pixels
Implementation Method 2
Conventional inorganic semiconductor light emitting diodes (LEDs) have demonstrated better light efficiency
Implementation Method 3
organic micro LEDs for red and green pixels
Data Source
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AI summary
Inorganic and organic LEDs are integrated in a single chip. In an integrated multi-color micro-LED display panel, arrays of different color micro LEDs are integrated with corresponding driver circuitry. Some colors of micro LEDs are inorganic micro LEDs, and other colors are organic micro LEDs. Inorganic versus organic can be selected on the basis of efficiency, for example using inorganic micro LEDs for blue pixels and organic micro LEDs for red and green pixels. In one approach, an array of pixel drivers is first fabricated on a supporting substrate. Multiple strata of micro LEDs are then stacked on top of the base substrate. The strata containing inorganic micro LEDs are fabricated first, with one color per stratum. A single stratum containing all of the organic micro LEDs is then fabricated at the top of the stack.