Laser safety systems, devices, and methods for use in laser projectors are described. A laser projector includes any number of laser diodes that each emit laser light, a laser diode power source, a current sensor to detect a magnitude of the electric current output by the power source, a photodetector to detect a power/intensity of the laser light, a beam splitter to direct a first portion of the light towards the photodetector and a second portion of the light towards an output on the projector, and first and second laser safety circuits responsive to signals from the photodetector and the current sensor, respectively. The laser safety circuits selectively electrically couples/uncouples the laser diodes from the power source depending on signals from the photodetector and/or the current sensor. Particular applications of the laser safety systems, devices, and methods in a wearable heads-up display are described.

Laser safety systems, devices, and methods for use in laser projectors are described. A laser projector includes any number of laser diodes that each emit laser light, a laser diode power source, a current sensor to detect a magnitude of the electric current output by the power source, a photodetector to detect a power/intensity of the laser light, a beam splitter to direct a first portion of the light towards the photodetector and a second portion of the light towards an output on the projector, and first and second laser safety circuits responsive to signals from the photodetector and the current sensor, respectively. The laser safety circuits selectively electrically couples/uncouples the laser diodes from the power source depending on signals from the photodetector and/or the current sensor. Particular applications of the laser safety systems, devices, and methods in a wearable heads-up display are described.

To safely project a desired projection image in any projection area, provided is a projection system including: a projection device projecting light forming display information in a projection area; an imaging device capturing a range including the projection area; and a control device controlling to cause the projection device to project light and the imaging device to capture the projection area. The control device includes: an analysis circuit accumulating image information about the projection area captured by the imaging device and detects an abnormality in the projection area by comparing any one piece of accumulated image information about the projection area with image information about the projection area most recently captured by the imaging device; and a safety control circuit executing safety control to change a projection condition for the projection device when an abnormality is detected in the projection area by the analysis circuit.

A projector includes a projection section that projects first light representing an image on a projection surface, a detection section that detects whether or not an enclosure member that encloses part of an area through which the first light projected via the projection section passes has been attached to the projector, and an adjustment section that adjusts the intensity of the first light based on the result of the detection performed by the detection section.

The present invention provides an electronic device, wherein the electronic device includes a projector and a controller. The projector includes a laser module and a lens module with a cover glass, wherein a laser beam generated from the laser module passes through the lens module to generate a projected image. The controller is coupled to the projector, and is arranged for determining if the cover glass is broken to generate a determination result, and controlling a power of the laser module according to the determination result.

Disclosed is a projection device including a MEMS mirror which oscillates about one or more oscillation axes to scan light from one or more lasers, across a display screen, to project pixels which define an image onto a display screen. Also disclosed is a display method including selecting a laser class for the projection device; calculating a relationship between maximum accessible emission limit and distance, for the selected laser class; and selecting a desired maximum accessible emission limit for an image which is to be projected by the projection device onto said display screen.

A method, a system, and a computer program product for reducing heat generated during projection of visual content. The method includes determining a temperature of at least one light emitter that projects a visual content based on calibration data. The method further includes determining, by a processor, whether the temperature exceeds a temperature threshold. The method further includes calculating, by the processor, at least one adjustment that reduces a level of heat generated by the at least one light emitter during projection of the visual content. The at least one adjustment overrides at least one portion of the calibration data. The method further includes applying the at least one adjustment to the at least one light emitter and modulating the at least one light emitter to project the visual content in accordance with the at least one adjustment applied to the calibration data.

In a projector, a first fixation section and a second fixation section are formed at two places located at a distance in an optical axis direction in a lens barrel of a projection optical system. A holding member has contact with the first fixation section from an optical axis direction-rear side, and is fixed, an optical component housing of an illumination light guide optical system has contact with the holding member from the optical axis direction-rear side, and is fixed. A light modulating/combining optical system for generating image light has contact with the second fixation section from the optical axis direction-rear side and is fixed. In other words, the light modulating/combining optical system is directly fixed to the lens barrel without the intervention of the holding member for fixing the illumination light guide optical system to the lens barrel.

An image display apparatus according to an embodiment of the present technology includes an image display unit, a calculator, and a notification section. The image display unit includes an emission surface and displays an image by emitting light from the emission surface. The calculator calculates a reference distance from the emission surface, the reference distance serving as a determination criteria for an influence of emitted light that is emitted from the image projection section. The notification section notifies about information on the influence of the emitted light on the basis of the calculated reference distance.

A projection display device includes: a light source that emits a first and a second laser lights; a scanning drive mirror that reflects the first and the second laser lights, and uses the first and the second laser lights in scanning; a light diffusion unit that includes a predetermined region that allows the first laser light to be transmitted therethrough, and diffuses the first laser light; a light detection unit that detects the second laser light that passed the predetermined region; and a control unit that executes a process to detect the second laser light, and determines a state of the predetermined region on the basis of a detection value of the light detection unit. In a case where the control unit determines that a defect occurs in the predetermined region as the state, the control unit executes a process to stop displaying the projection.