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US 2006/0076479 A1Published application
Method and apparatus using liquid crystal light valve to filter incident light on a photodetector
AssigneeAvago Technologies ECBU IP (Singapore) Pte. Ltd.
InventorsLen-Li Lim, Rizal Jaffar, Joon-Chok Lee
Life of this patent
Estimating the term…
Abstract
In one embodiment, light is detected using a photodetector. If the detected light is causing the photodetector to saturate, one or more liquid crystal light valves are adjusted to filter the amount of incident light on the photodetector.
Claims20
Apparatus, comprising:
- a photodetector;
- a light valve comprising a liquid crystal element, positioned to filter incident light on the photodetector;
- and
- a control system to determine whether incident light on the photodetector is causing the photodetector to saturate and, if so, apply an electrical stimulus to adjust the light valve.
1 more element
Apparatus, comprising:
- at least one light emitting element;
- a photodetector, positioned to receive light emitted by at least some of the light emitting elements;
- a light valve comprising a liquid crystal element, positioned to filter incident light on the photodetector;
- and
- a control system to i) determine whether incident light on the photodetector is causing the photodetector to saturate and, if so, apply an electrical stimulus to adjust the light valve, and ii) in response to the light detected by the photodetector, regulate a drive signal of a first one or more of the light emitting elements, thereby regulating the light that is emitted by the first one or more light emitting elements.
2 more elements
A method, comprising:
- detecting light using a photodetector;
- and
- determining whether the detected light is causing the photodetector to saturate and, if so, adjusting one or more liquid crystal light valves to filter the amount of incident light on the photodetector.
Dependencies are inferred from the claim text.