Device and method for projecting an image

Patent metadata

Field	Value
Publication number	US-11330233-B2
Application number	US-201816766154-A
Country	US
Kind code	B2
Filing date	Nov 15, 2018
Priority date	Jan 17, 2018
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A device for projecting an image. The device has a laser device, which is developed to emit a laser beam, the laser device having a modulation unit, which is developed to modulate image data onto the laser beam; and a micromirror device, which is developed to deflect the laser beam in a linear manner. The modulation unit is developed to modulate the laser beam in such a way that a predefined optical warning signal is emitted in a region around reversal points of the linear deflection.

First claim

What is claimed is:

1. A device for projecting an image, comprising:
a laser device configured to emit a laser beam, the laser device having a modulation unit which is configured to modulate image data onto the laser beam;
a micromirror device configured to deflect the laser beam in a linear manner; and
an arithmetic unit configured to calculate an energy of the laser beam during the deflection along at least one line;
wherein the modulation unit is configured to modulate the laser beam in such a way that a predefined optical warning signal is emitted in a region around reversal points of the linear deflection,
wherein the predefined optical warning signal comprises individual pulses or pixels directly at the reversal points or in a vicinity of the reversal points,
wherein the modulation unit is configured to carry out the modulation of the laser beam for the emission of the optical warning signal as a function of the calculated energy,
wherein the energy of the laser beam is calculated during a predefined number of lines to be scanned next, wherein when the ascertained energy exceeds a predefined threshold value, the predefined optical warning signal is output at an end of the next scanned line by the modulation of the laser beam.

2. The device as recited in claim 1 , wherein the modulation unit is configured to carry out the modulation of the laser beam for the emission of the optical warning signal as a function of the modulated image data.

3. The device as recited in claim 1 , wherein the modulation unit is configured to emit the optical warning signal at an end of a line if the energy of the laser beam during the deflection along this line and/or along adjacent lines exceeds the predefined threshold value.

4. The device as recited in claim 1 , wherein the modulation unit is configured to modulate the image data onto the laser beam in such a way that edge regions of the lines are shielded, with the exception of the optical warning signal.

5. The device as recited in claim 4 , wherein the modulation unit is configured to carry out the modulation of the laser beam for the emission of the optical warning signal as a function of a size of the shielded edge regions.

6. The device as recited in claim 1 , further comprising:
a sensor device which is configured to output a detection signal when a person is approaching a solid angle region scanned by the micromirror device;
wherein the modulation unit is configured to carry out the modulation of the laser signal for the emission of the optical warning signal as a function of the detection signal.

7. The device as recited in claim 1 , wherein the modulation unit is configured to modulate the laser beam in such a way that a band-shaped region of a predefined color and/or intensity along the reversal points of the linear deflection is continuously emitted as an optical warning signal.

8. The device as recited in claim 1 , wherein the modulation unit is configured to modulate the laser beam in such a way that the optical warning signal poses no risk to a human eye.

9. A method for projecting an image, the method comprising the following steps:
emitting a laser beam using a laser device, image data being modulated onto the laser beam;
linearly deflecting the laser beam using a micromirror device; and
calculating an energy of the laser beam during the deflection along at least one line;
wherein the laser beam is modulated in such a way that a predefined optical warning signal is emitted in a region around reversal points of the linear deflection,
wherein the predefined optical warning signal comprises individual pulses or pixels directly at the reversal points or in a vicinity of the reversal points,
wherein the modulation unit is configured to carry out the modulation of the laser beam for the emission of the optical warning signal as a function of the calculated energy,
wherein the energy of the laser beam is calculated during a predefined number of lines to be scanned next, wherein when the ascertained energy exceeds a predefined threshold value, the predefined optical warning signal is output at an end of the next scanned line by the modulation of the laser beam.

10. The device as recited in claim 1 , wherein the laser device includes a green, a blue and a red laser, and the predefined optical warning signal is emitted only by the red laser.

Assignees

• Bosch Gmbh Robert

Inventors

• Pilard Gael
• Ostertag Peter

Classifications

• G02B26/101 Primary

  with both horizontal and vertical deflecting means, e.g. raster or XY scanners (colour television using laser beams scanning a display screen H04N9/3129) · CPC title

• H04N9/3135 Primary

  Driving therefor · CPC title

• H04N9/3197

  using light modulating optical valves · CPC title