Micro-projection device with anti-speckle imaging mode
AssigneeLemoptix SA
InventorsLucio Kilcher, Faouzi Khechana, Nicolas Abele
Life of this patent
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Abstract
A micro-projection system for projecting light on a projection surface (104), comprising: —at least one coherent light source (101); —optical elements (102, 108, 109) in the optical path between said coherent light source and said projection surface; —said optical elements including at least one reflective member (102) actuated by a drive signal for deviating light from said light source so as to scan a projected image onto said projecting surface; —said optical elements including at least one pixel displacement unit (106) for providing a displacement signal synchronized with the image scanning signal so as to reduce speckle onto said projecting surface. The corresponding method for reducing speckle is also provided.
Claims15
A micro-projection system for projecting light on a projection surface, comprising:
- at least one coherent light source;
- optical elements in the optical path between said coherent light source and said projection surface;
- said optical elements including at least one reflective member actuated by a drive signal for deviating light from said light source so as to scan a projected image onto said projection surface;
- said system including at least one pixel displacement unit for displacing the position of the pixel with respect to the position of a corresponding pixel in another image frame, so as to reduce speckle onto said projection surface, wherein said pixel displacement unit is arranged for controlling the coherent light source so as to modify the phase of laser pulses sent by said at least one coherent light source, so that the position of said pulses on said projection surface is modified by said phase modification.
A method for reducing speckle in a laser micro-projection system, comprising:
- providing a plurality of successive image frames with at least one coherent light source towards a target;
- providing a displacement of at least a portion of a first image frame with respect to the same or another image frame so as to reduce speckle onto said projection surface, by controlling light source so as to modify the phase of laser pulses sent by said at least one coherent light source.
Dependencies are inferred from the claim text.