MEMS-Driven Micro-LED Array for Low-Ghosting 3D Light Fields
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Solution Overview
Problem
Current light field displays face challenges in scaling to large, public environments due to inefficiencies in LED usage, ghosting issues, and high duty cycles, which affect brightness and contrast, making them unsuitable for immersive experiences without glasses.
Innovation Solution
A MEMS-driven optical multiplexing system using a moving array of LEDs, where each LED is visible only from specific angles, optimizing LED usage and reducing ghosting through optical multiplexing and synchronized movement with video content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large array of LEDs is used to provide sufficient light output for light field display, then the brightness can be maintained, but the duty cycle for each LED becomes very small and excessive LED materials are required
Solution Approach 1:
The patent implements a movable LED array that dynamically repositions LED modules to different spatial locations corresponding to different viewing angles. This dynamic positioning allows a smaller number of LEDs to serve multiple viewing positions sequentially, reducing the total quantity of LED materials needed while maintaining sufficient brightness at each position during its active period.
Solution Approach 2:
The system employs periodic activation of LED modules, where each LED module is activated in sequence for specific time intervals corresponding to its assigned viewing angle. This periodic action allows the same LED materials to serve multiple functions across different time periods, reducing the overall quantity required compared to having all LEDs simultaneously active.
2Ease of operation
If a mask is used to control light output for each viewer, then light direction can be controlled, but pixels with substantial off axis viewing issues and visual artifacts are created due to incomplete extinction of neighboring light field sub-pixels
Solution Approach 1:
The patent segments the light field display into multiple angular zones, with each LED module assigned to a specific viewing angle range. By physically separating and positioning LED modules to correspond to different angular segments, the system achieves precise light direction control without requiring masks, thereby avoiding the visual artifacts and off-axis viewing issues that masks create.
Solution Approach 2:
The patent introduces movable LED modules as intermediaries between the light source and the viewer. These modules act as controllable light emitters that can be positioned to direct light precisely toward specific viewing angles, replacing the mask-based approach with a more reliable active light control mechanism that avoids incomplete extinction and visual artifacts.
3Measurement precision
If LCD and OLED displays are used for light field display, then high pixel density can be achieved, but the systems are not suitable for large scale public environments and lack flexibility for modular deployment
Solution Approach 1:
The patent divides the light field display system into multiple independent, modular LED modules that can be independently positioned and controlled. Each module functions as a discrete unit with its own LED array and control circuitry, enabling the system to be segmented into manageable components that can be deployed modularly in large-scale public environments while maintaining high effective pixel density through precise angular positioning.
Solution Approach 2:
The patent designs universal LED modules that can serve multiple functions: each module can be positioned to serve different viewing angles, can be independently controlled for various content displays, and can be deployed in different configurations for various application scenarios. This multi-functionality enables the system to adapt to large-scale public environments and flexible modular deployment requirements.
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
Enables scalable, high-resolution, 3D displays that maintain brightness and contrast across various viewer positions, allowing for immersive experiences without glasses, and reducing the need for excessive LED usage.
Implementation Method 1
A MEMS-driven optical multiplexing system using a moving array of LEDs
Implementation Method 2
A MEMS-driven optical multiplexing system using a moving array of LEDs
Data Source
AI summary
An optical light package includes an optical output lens, an optical filter located thereunder and between the output lens and LEDS, a tray of LEDs arrayed on a stage mounted on a linear comb based MEMS device that is distributed in such a way that the stage is movable, and a driver that controls movement of the stage.