Matan Naftali | Maradin Ltd: How do you create a high-resolution image without a fixed pixel grid, and what new display capabilities does this unlock?
00:02:20 - 00:04:49
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How do you create a high-resolution image without a fixed pixel grid, and what new display capabilities does this unlock?
Maradin's Laser Beam Scanning (LBS) light engine operates by combining red, green, and blue laser diodes into a single, full-color beam. This collimated beam is then directed onto a single, two-axis MEMS mirror. The mirror is driven in a raster scan pattern—line by line, top to bottom—at a 60 Hz video rate, effectively "painting" the image one pixel at a time onto the target, which could be a waveguide input or directly onto the retina.
The entire system is managed by a sophisticated, closed-loop control architecture. A dedicated digital mirror controller ensures the MEMS mirror's position is precise and stable across varying environmental conditions like temperature and pressure. This controller is synchronized with a video controller, implemented together on a single chip, which renders the incoming video signal into a sequential stream of pixel data, perfectly timed to the mirror's exact position.
This architecture fundamentally defines the display in the time domain, rather than the spatial domain of traditional fixed-pixel panels (like MicroLED or LCOS). Because pixel location is determined by the precise timing of laser firing relative to the mirror's known position, there is no fixed grid. This gives the system the unique ability to place any pixel at any desired location within the field of view, breaking free from the constraints of a rectangular, evenly-spaced pixel matrix.
In this short video, you can learn:
* The core components and architecture of a MEMS-based Laser Beam Scanning (LBS) system.
* How a closed-loop controller synchronizes the MEMS mirror and laser modulation.
* The fundamental concept of a "time-domain" display versus a "location-fixated" display.
📋 **Clip Abstract** This clip details the fundamental working principle of Maradin's raster-scanning LBS light engine, from the RGB lasers to the closed-loop MEMS control system. It introduces the core technical concept of a "time-domain" display, where pixel placement is controlled by timing, enabling images that are not restricted to a fixed grid.
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#LaserBeamScanning, #MEMSMirror, #TimeDomainDisplay, #ClosedLoopControl, #ARDisplays, #LightEngines
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00:16:11 - 00:17:41
For laser beam scanning, why is a simple line-by-line raster scan a more powerful approach for AR than a complex Lissajous pattern?
For laser beam scanning, why is a simple line-by-line raster scan a more powerful approach for AR than a complex Lissajous pattern?
There are three primary methods for creating images with laser scanning: vector, Lissajous, and raster. Vector scanning is best suited for simple symbols and industrial applications, while the main debate for full-image displays is between Lissajous and raster scanning. Lissajous scanning, which uses a combination of two sinusoidal waveforms, is a common approach due to its relative ease of control and manufacturing.
However, Lissajous scanning has significant drawbacks for high-performance AR applications. A key issue is the potential for visible line separation artifacts when the user's eye moves quickly, which is detrimental in gaming or other dynamic use cases. This artifact becomes more pronounced as developers push for higher refresh rates, limiting the ultimate performance of the display.
The most critical differentiator is the computational complexity of image rendering. With raster scanning, the pixel layout is linear and predictable, making it straightforward to implement advanced features like foveated rendering or creating non-rectangular display shapes. In contrast, attempting to manipulate pixel density or shape with a Lissajous pattern is described as a "nightmare" due to the non-linear, complex trajectory of the beam, which is why these advanced features are not seen from players using that method.
In this short video, you can learn:
* The three main types of laser scanning: vector, Lissajous, and raster.
* The key visual artifacts and limitations associated with Lissajous scanning in AR.
* Why raster scanning is technically superior for enabling dynamic rendering features like foveation and free-form displays.
📋 **Clip Abstract** This clip provides a technical comparison between raster and Lissajous scanning methods for LBS displays. It explains the visual and performance drawbacks of Lissajous patterns and highlights why raster scanning's simpler rendering path is crucial for enabling advanced AR features.
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#LaserBeamScanning, #RasterScanning, #LissajousScanning, #FoveatedRendering, #AugmentedReality, #DisplayTechnology
00:17:59 - 00:20:09
Lasers in AR glasses sound dangerous. How do you engineer a system to be completely eye-safe and also eliminate the distracting "speckle" effect?
Lasers in AR glasses sound dangerous. How do you engineer a system to be completely eye-safe and also eliminate the distracting "speckle" effect?
Eye safety in a laser-based AR system is addressed with a multi-layered strategy. The foundation is an inherent system design that ensures operation within Class 1 laser safety limits for all architectures, including direct retinal projection and waveguides. This is supplemented by passive safety features, such as optical filters, which act as a physical barrier to prevent any potential high-power laser burst from reaching the user's eye.
The most critical safety layer is an active, high-speed fail-safe mechanism integrated directly into the MEMS and its controller. The system contains internally integrated interlocks that continuously monitor the MEMS scanning operation and data integrity. If any fault or anomaly is detected—such as the mirror stopping—the system shuts off the lasers "ten times faster than a human eye blink," providing a robust and instantaneous response to any potential hazard.
Laser speckle is not just a property of the laser itself but a system-level optical challenge that arises from the coherent nature of the light. The solution lies in the holistic optical design of the entire light engine and its interface with the display combiner. For waveguide-based systems, mitigating speckle requires careful engineering of the coupling optics between the MEMS scanner and the waveguide's input coupler to control how the light is injected and propagates, thereby reducing the interference patterns that cause visible speckle.
In this short video, you can learn:
* The three-tiered approach to ensuring Class 1 laser eye safety in AR devices.
* The function of high-speed, integrated interlocks in the MEMS controller as an active fail-safe.
* Why laser speckle is a system-level optical problem and how it is mitigated through careful design.
📋 **Clip Abstract** This clip addresses two major technical hurdles for laser-based AR: eye safety and speckle. It details the robust, multi-layered safety architecture and explains that speckle is a system-level challenge solved through careful optical design between the scanner and the waveguide.
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#LaserEyeSafety, #MEMSScanner, #OpticalDesign, #LaserSpeckleMitigation, #AugmentedReality, #WearableElectronics