Systems, devices, and methods for laser projection in wearable heads-up displays
AssigneeGoogle Inc.
InventorStuart James Myron Nicholson
Life of this patent
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Abstract
There is provided a wearable heads-up display (WHUD) having a laser projector to generate a display image. The display image can have a pixel having a pixel on-time. Furthermore, the laser projector can have a laser diode to emit laser light. The WHUD can also include a controller communicatively coupled to the laser diode. The controller can modulate the laser diode during the pixel on-time to be off during a laser off-time of the pixel on-time and on during a laser on-time of the pixel on-time. Moreover, the WHUD can include a holographic optical element to receive the laser light from the laser projector and redirect the laser light towards an eye of a user of the WHUD.
Claims20
A wearable heads-up display comprising:
- a laser projector to generate a display image comprising a pixel having a pixel on-time, the laser projector comprising a laser diode to emit laser light;
- a controller communicatively coupled to the laser diode, the controller communicatively coupled and operable to modulate the laser diode to be turned on and off during a first period of the pixel on-time, the first period of the pixel on-time includes a laser on-time during which the laser diode is on and includes a laser off-time during which the laser diode is off, the controller is operable to set a power output by the laser diode during the laser on-time based on a total baseline power deliverable by the laser diode at a baseline intensity during the pixel on-time, the total baseline power is greater than zero, and the baseline intensity is greater than zero;
- and
- a holographic optical element to receive the laser light from the laser projector and redirect the laser light towards an eye of a user of the wearable heads-up display.
A method of operating a wearable heads-up display, the method comprising:
- emitting laser light by a laser diode, the laser light to generate a display image comprising a pixel having a pixel on-time;
- receiving the laser light from the laser diode by a holographic optical element, the holographic optical element to redirect the laser light towards an eye of a user of the wearable heads-up display;
- and
- modulating, by a controller communicatively coupled to the laser diode, the laser diode to be turned on and off during a first period of the pixel on-time, wherein the first period of the pixel on-time includes a laser on-time during which the laser diode is on and includes a laser off-time during which the laser diode is off, the controller is operable to set a power output by the laser diode during the laser on-time based on a total baseline power deliverable by the laser diode at a baseline intensity during the first period of the pixel on-time, wherein the total baseline power is greater than zero, and the baseline intensity is greater than zero.
Dependencies are inferred from the claim text.