Holographic Laser Projection (HLP) explained

Light Blue Optics have created quite a stir with their Light-Touch pico-projector reference design. The small projector (up to 10" image) include an infra-red sensor for the touch-ability, and sports a wide throw angle which allows it to project onto the table it is sitting on:

LBOs Light Touch photo

The projector itself is based on Holographic Laser Projection (HLP). LBO's system uses a coherent laser to illuminate an LCoS that displays a hologram which diffracts the laser to create the original image. A diffraction pattern of the desired 2D image is calculated (using LBO's own algorithms) and displayed on an LCoS microdisplay.

The 'holographic' part refers to the way the image is created. The final projected image is not 'holographic' in any way - it's not a 3D display.

According to LBO, HLP have several advantages compared to other projection technologies (DLP, LCoS and Laser-Beam-Steering):

  • Low speckle
  • Always in focus
  • Efficiency, Brightness and color gamut
  • Wide throw angle - creating large images at close proximity to the projector aperture
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