Eyewear projector brightness control
AssigneeSnap Inc.
InventorsJason Heger, Gerald Nilles
Life of this patent
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Abstract
Eyewear including a projector having a variable feedback loop controlling a forward current delivered to a colored light source. The colored light source is configured to generate a colored light beam to generate a displayed image. The variable feedback loop in one example has a variable resistance to selectively generate a high brightness image when the eyewear is operated outside, or in a high ambient light setting, and to selectively generate a nominal brightness image when the eyewear is operated inside. A controller selectively controls the drive current delivered to the colored light source to control the brightness mode of the image.
Claims20
A projector, comprising:
- a light source configured to generate a light beam;
- a display configured to modulate the light beam to generate an image;
- and
- a controller configured to control a brightness of the light source, wherein the controller comprises a selectively configurable feedback loop including a first resistor, a second resistor, and a switch configured to selectively establish only the first resistor in the feedback loop in a first mode, and selectively establish the first resistor and the second resistor in parallel in a second mode.
A method of using a projector, comprising:
- a light source configured to generate a light beam;
- a display configured to modulate the light beam to generate an image;
- and
- a controller having a feedback loop, the method comprising:
- controlling a brightness of the light source by the controller, wherein the controller selectively configures the feedback loop including a first resistor, a second resistor, and a switch to establish only the first resistor in the feedback loop in a first mode, and the switch selectively establishing the first resistor and the second resistor in parallel in a second mode.
Dependencies are inferred from the claim text.