Projection apparatus for producing a pixel-based illumination pattern
A projection apparatus for producing a pixel-based illumination pattern has a laser light source for producing coherent laser light and a micromirror array with a multiplicity of mirrors. The mirrors are implemented so as to be controllable in terms of their position, for setting a brightness and/or color of a respective pixel of the pixel-based illumination pattern. The laser light source emits the laser light towards the micromirror array. A beam-shaping element splits the laser light from the laser light source into a multiplicity of partial beams and each of the partial beams is oriented toward one of the mirrors of the micromirror array.
1. A projection apparatus for producing a pixel-based illumination pattern, the projection apparatus comprising:
a micromirror array having a multiplicity of mirrors, said mirrors being configured for controlling a position thereof for setting a brightness and/or color of a respective pixel of the pixel-based illumination pattern;
a laser light source for producing coherent laser light and for emitting the laser light towards said micromirror array; and
a beam-shaping element configured to split the laser light from said laser light source into a multiplicity of partial beams, which are each oriented toward one of said mirrors of said micromirror array such that, except for stray radiation, intermediate spaces between said mirrors of said micromirror array are not illuminated by said multiplicity of partial beams.
2. The projection apparatus according to claim 1 , wherein said beam-shaping element is configured to produce a dot pattern on said micromirror array by way of the partial beams, with one light point formed on one of said mirrors of said micromirror array and with an irradiance on said mirrors being greater than in an intermediate space between said mirrors.
3. The projection apparatus according to claim 1 , wherein a space between a laser of said laser light source and said beam-shaping element is sealed to be dust-tight or air-tight.
4. The projection apparatus according to claim 1 , wherein said beam-shaping element is integrated into said laser light source.
5. The projection apparatus according to claim 1 , wherein said beam-shaping element for splitting the laser light into the partial beams has at least one of a photonic crystal or an optical grating.
6. The projection apparatus according to claim 1 , wherein said beam-shaping element has an optical divergence structure for diverging at least one of the laser light or the partial beams.
7. The projection apparatus according to claim 1 , wherein said laser light source is configured to produce monochromatic laser light, and said mirrors of said micromirror array are Bragg gratings.
8. The projection apparatus according to claim 1 , which comprises a converter element disposed in a beam path downstream of said micromirror array and configured to convert a laser light reflected by said micromirror array into light of a different color and/or white light, wherein said micromirror array is configured to use said mirrors to produce, by reflection of the partial beams, mutually independent luminous points on said converter element each belonging to a respective one of the pixels of the illumination pattern.
9. The projection apparatus according to claim 8 , wherein said converter element has phosphor for converting the laser light.
10. The projection apparatus according to claim 8 , wherein said converter element has a converter layer that is arranged on a reflector, and wherein said reflector has a metal layer that is coupled to a cooling device of the projection apparatus.
11. The projection apparatus according to claim 1 , wherein said laser light source is configured to generate blue laser light.
12. The projection apparatus according to claim 1 , which comprises a deflection device configured to deflect laser light from said laser light source that would otherwise travel past said micromirror array onto said micromirror array.
13. The projection apparatus according to claim 12 , wherein said deflection device is configured to deflect the laser light only onto respective mirrors of said micromirror array that are located in a predetermined peripheral region outside a center of said micromirror array.
14. The projection apparatus according to claim 1 , configured as a headlamp for a motor vehicle.
15. The projection apparatus according to claim 1 , configured as a multicolor projector for image production.
16. The projection apparatus according to claim 1 , which comprises a converter element disposed in a beam path downstream of said micromirror array and configured to convert a laser light reflected by said micromirror array into light of a different color and/or white light.