Spatially modulated lighting device.

Abstract

Device (1) for illuminating an object (3), the device being configured to be illuminated by a light source (2), and comprising: a photodetector (10), having detection pixels (10i); a modulator (20), formed of a matrix of modulation pixels (20i), interposed between the light source and the pixelated photodetector, each modulation pixel having a material whose optical property varies according to an electrical control; a control unit (30), configured to activate each modulation pixel according to a light intensity detected by the detection pixels; the device being characterized in that: the surface of the photodetector transmits a part of the light, so that the light transmitted by the pixelated photodetector illuminates the object; so that the device is configured to be disposed between the light source and the object.

Claims

a direction of polarization of the light as a function of the electrical control applied to said modulation pixel, the device comprising an output polarizer (27j) interposed between the modulator (20) and the pixelated photodetector (10).

5. Device according to claim 4 comprising an input polarizer (20; n), the device being such that the modulator (20) is interposed between the input polarizer and the output polarizer (27;).

6. Device according to any one of claims 1 to 3, wherein each modulation pixel (10i) is configured to modify an absorbance of the light emitted by the light source as a function of the electrical control applied to said modulation pixel.

7. A device according to any one of the preceding claims, wherein the control unit (30) is configured to: a. memorize an illumination pattern; b. receive a detection signal representing a light intensity detected by the pixels of the photodetector; c. activate each modulation pixel according to the light intensity detected by the pixels of the photodetector and the memorized illumination pattern.

8. Device according to any one of the preceding claims, wherein the pixelated photodetector and the modulator are fixed to each other.

9. Device according to any one of the preceding claims, wherein the pixelated photodetector and the modulator are arranged in contact with each other or at a distance of less than 1 cm from each other. Eisa [Fig. 2] Fig. 3A [Fig. 3B] t [Fig. 4F] [Fig. 4G] [Fig. 4J] Fig. 7 Fig. 9 [Fig. 10] [Fig. 1 IB]

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