×

Multi-beam laser scanning display system with speckle elimination

  • US 6,154,259 A
  • Filed: 11/26/1997
  • Issued: 11/28/2000
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Fees
First Claim
Patent Images

1. A laser projection system for projecting an image with reduced speckle on a display surface, comprising:

  • a light modulator for modulating laser light responsive to signals indicative of said image;

    an optical system that defines an intermediate image plane for said modulated laser light, said intermediate image plane situated between said light modulator and the display surface;

    a speckle eliminator situated approximately at said intermediate image plane and comprising a diffusion plate, motion-inducing elements coupled to said diffusion plate and arranged approximately orthogonally with respect to said diffusion plate and means for energizing said motion-inducing elements to provide a non-zero phase shift between the motions of said orthogonal elements, thereby avoiding periodic moments of zero velocity; and

    an optical imaging system arranged to image said intermediate image plane and project diffused modulated laser light from said speckle eliminator on the display surface to display an image.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×