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US 8,711,093 B2Granted
Input device with photodetector pairs
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsChi-Boon Ong, Yu-Feng Yao, Sze-Ping Ong
Life of this patent
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Abstract
Input devices configured to provide user interface by detecting three dimensional movement of an external object are disclosed. The input device comprises at least two photodetector pairs, a radiation source and a circuit configurable to detect differential and common mode signals generated in the photodetector pairs. By detecting the common mode and differential signals, movement of an external object may be determined and used to control a pointer, or a cursor.
Claims20
An input device, comprising:
- a radiation source;
- a first photodetector pair located along a first axis with the radiation source located between the first photodetector pair;
- the first photodetector pair being configured to generate a first common mode signal;
- a second photodetector pair located along a second axis perpendicular to the first axis, the second photodetector pair being configured to generate a second common mode signal;
- and
- a circuit coupled with the first and second photodetector pairs and configured to detect movement along another axis perpendicular to the first and second axes by measuring an average value of the first and second common mode signals, the circuit having one or more circuit outputs of three dimensional signal values indicative of a three dimensional movement of an external object.
3 more elements
A navigation input device, comprising:
- a radiation source;
- a first photodetector pair, the radiation source located in the middle of the first photodetector pair to form a first axis;
- a first common mode node electrically coupled to the first photodetector pair;
- a second photodetector pair the radiation source located in the middle of the second photodetector pair to form a second axis perpendicular to the first axis;
- a second common mode node electrically coupled to the second photodetector pair;
- and
- a circuit electrically coupled to the first and second common mode nodes, wherein the circuit comprises a digital signal processing circuit and is configured to measure an average value of a first common mode signal generated at the first common mode node and a second common mode signal generated at the second common mode node to produce an output signal, the output signal correlates to movement of an external object along another axis perpendicular to the first and second axes.
4 more elements
An input device, comprising:
- a radiation source;
- a first photodetector pair located along a first axis with the radiation source located between the first photodetector pair, the first photodetector pair being configured to generate a first differential signal and a first common mode signal;
- a second photodetector pair located along a second axis perpendicular to the first axis with the radiation source located between the second photodetector pair, the second photodetector pair being configured to generate a second differential signal and a second common mode signal;
- and
- a circuit coupled to the first and second common mode signals,
- wherein the circuit is configured to multiply the first and second common mode signals with a weighting factor to detect movement of an external object along another axis perpendicular to the first and second axes.
3 more elements
Dependencies are inferred from the claim text.