Dual Microdevice Pixel Driving for Wide-Range MicroLED Operation
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Solution Overview
Problem
Microdevices, such as microLEDs, face inefficiencies when operating outside optimized current levels, leading to reduced performance across a wide operation regime due to challenges in optimizing functionality across varying conditions like bias levels, temperature, and lighting conditions.
Innovation Solution
Integrating two microdevices with different optimization conditions in pixels or subpixels by connecting them in series or parallel, and controlling them through accessible contact points, allowing for separate operation and biasing to extend the optimal operation range, with the option of sharing common layers and using smoothing functions for seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single microdevice is optimized for a specific operating condition, then performance at that condition is improved, but performance across a wide operation regime deteriorates
Solution Approach 1:
The pixel is divided into multiple microdevices (first microdevice and second microdevice), each optimized for different operating conditions. This segmentation allows the system to maintain high performance across a wide operation regime by switching between or combining multiple specialized components rather than relying on a single general-purpose device.
Solution Approach 2:
The patent implements dynamic control of multiple microdevices based on real-time operating conditions. The system can switch between devices or combine their outputs depending on factors like current level, temperature, and lighting conditions, making the overall system adaptive and versatile across varying environments.
2Adaptability or versatility
If multiple microdevices are integrated in a pixel, then operational range is extended, but device complexity increases
Solution Approach 1:
Multiple microdevices are merged within a single pixel structure, sharing common elements like contact points and potentially common layers. This merging approach extends the operational range while managing complexity by consolidating control interfaces and reducing the number of separate components needed.
Solution Approach 2:
The patent creates a universal pixel structure that can accommodate multiple microdevices with different optimization characteristics. The control circuitry is designed to universally manage various device configurations (series or parallel connections), making the pixel structure multi-functional and adaptable to different operating conditions without requiring entirely different designs.
3Power
If microdevices are connected in series, then power output is summed, but control complexity increases
Solution Approach 1:
The patent introduces intermediary control circuitry that manages the series-connected microdevices. This intermediary layer handles the complexity of coordinating multiple devices while presenting a simplified interface to the overall system, allowing power outputs to be summed without directly exposing the control complexity to higher-level system architecture.
4Adaptability or versatility
If microdevices operate outside optimized current levels, then operational flexibility is improved, but external quantum efficiency deteriorates
Solution Approach 1:
Each microdevice is designed with local quality optimization for specific operating conditions (different current levels, temperatures, or lighting conditions). By having multiple devices with different local optimizations within the same pixel, the system can maintain high external quantum efficiency across a wide range of operating conditions by selecting or combining devices matched to current local conditions.
Data Source
AI summary
The present invention relates to integration of multiple microdevices in pixels and in different combinations and their optimization for different functions. The microdevices may be connected in series and parallel as well have common and separate layers. An integrated combination may have a smoothing function to facilitate switching between different conditions and operations.