Micro LED Projection System Using Time-Multiplexed Scanning
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Solution Overview
Problem
The dense small micro LEDs in projection systems are difficult to repair or replace, leading to inefficiencies and high costs in both soft and hard repair methods, and the small size of micro LEDs results in low manufacturing efficiency and high process costs.
Innovation Solution
A projection system that includes at least one micro LED line emitting lights at a changing frequency and a scan optical system that scans and projects these lights onto a target projection plane, allowing for a complete image to be formed even with fewer micro LED lines than the horizontal resolution, facilitating easier repair and using larger micro LEDs to improve manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of micro LEDs is reduced to increase resolution, then the number of LEDs per area increases and resolution improves, but manufacturing efficiency decreases and process cost increases
Solution Approach 1:
The patent transitions from a static 2D array of micro LEDs to a dynamic time-multiplexed system where a reduced number of micro LEDs are activated sequentially at different time slots. This temporal dimension allows the system to achieve the same resolution effect with fewer physical LEDs, thereby improving manufacturability while maintaining image quality.
2Measurement precision
If the size of micro LEDs is reduced to increase resolution, then the number of LEDs per area increases, but repair and replacement become difficult
Solution Approach 1:
By introducing the time dimension through sequential activation of micro LEDs, the system achieves high resolution with fewer physical components. This reduction in component density makes individual micro LEDs more accessible and easier to repair or replace compared to densely packed arrays.
Solution Approach 2:
The patent changes the operational parameter from simultaneous activation of all micro LEDs to time-multiplexed sequential activation. This parameter change allows the same resolution to be achieved with fewer micro LEDs, improving ease of repair and replacement.
3Ease of repair
If redundant micro LEDs are provided for soft repair, then repair efficiency improves, but production cost increases and pixel space is occupied preventing pixel shrinkage
Solution Approach 1:
The patent changes the fundamental parameter of micro LED quantity from a large dense array to a reduced set activated sequentially in time. This parameter change eliminates the need for numerous redundant micro LEDs while maintaining repair capability, as the time-multiplexed system inherently requires fewer physical components to achieve the same resolution.
Solution Approach 2:
By adding the time dimension to the display system, the patent achieves high resolution with fewer micro LEDs. This temporal approach replaces the spatial redundancy of having many extra micro LEDs for repair purposes, reducing both quantity and cost while maintaining repair efficiency.
4Measurement precision
If a large number of micro LED lines are used to match horizontal resolution, then image quality improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent introduces the time dimension through sequential activation of micro LED lines, allowing the system to achieve high horizontal resolution with fewer physical micro LED lines. Each line is activated at different time slots, creating the perception of high resolution through temporal multiplexing rather than spatial density.
Solution Approach 2:
The patent changes the operational parameter from simultaneous activation of all micro LED lines to time-multiplexed sequential activation. This parameter change reduces the number of micro LED lines required while maintaining image quality, thereby reducing device complexity and manufacturing cost.
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 solution enables efficient image formation with fewer micro LED lines, simplifies the repair process by allowing for easier replacement, and alleviates manufacturing challenges by using larger micro LEDs, thus reducing costs and improving overall system performance.
Implementation Method 1
The micro LED line is configured for emitting lights with a changing frequency of X times per second
Implementation Method 2
The scan optical system is configured to scan the lights emitted from the micro LED line with a scan rate of M seconds per scan and to project images formed of the lights to corresponding positions on a target projection plane
Data Source
AI summary
A projection system is provided. The projection system includes at least one micro LED line and a scan optical system. The micro LED line is configured for emitting lights with a changing frequency of X times per second. The scan optical system is disposed at a downstream side of the at least one micro LED line. The scan optical system is configured to scan the lights emitted from the micro LED line with a scan rate of M seconds per scan and to project images formed of the lights to corresponding positions on a target projection plane. The projection system has a horizontal resolution of N lines. A total number n of the at least one micro LED line is smaller than N. Also, X=M*(N/n).