Displacement detection device with no hovering function and computer system including the same
AssigneePixart Imaging Inc.
InventorsWillie Song, Kevin Len-Li Lim
Life of this patent
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Abstract
A displacement detection device includes an image sensor, a processing unit and an output unit. The image sensor is configured to detect reflected light from a working surface to successively output image frames. The processing unit is configured to identify a hovering height and calculate a first axis displacement and a second axis displacement according to the image frames. The output unit is controlled by the processing unit to output a first ratio of the first axis displacement but not to output the second axis displacement when the hovering height is higher than a predetermined height.
Claims19
A displacement detection device, configured to perform contact operation or hovering operation on a working surface, the displacement detection device comprising:
- an image sensor configured to detect reflected light from the working surface and successively output image frames;
- and
- a processing unit configured to
- identify a contact mode or a hovering mode,
- calculate a first axis displacement and a second axis displacement according to the image frames,
- output the first axis displacement and the second axis displacement in full scale in the contact mode and
- output a first ratio of the first axis displacement and a second ratio of the second axis displacement in the hovering mode,
- wherein the second ratio is different from the first ratio, and the first ratio is 50%-100%.
A computer system, comprising:
- a displacement detection device, configured to perform hovering operation upon a working surface, the displacement detection device comprising:
- an image sensor configured to detect reflected light from the working surface and successively output image frames;
- a processing unit configured to identify a hovering mode and calculate a first axis displacement and a second axis displacement according to the image frames;
- and
- an output unit controlled by the processing unit and configured to output a hovering mode signal and output the first axis displacement and the second axis displacement in full scale when entering the hovering mode;
- and
- a host configured to take a first ratio of the first axis displacement as a first control value and a second ratio of the second axis displacement as a second control value when receiving the hovering mode signal,
- wherein the second ratio is different from the first ratio, and the first ratio is 50%-100%.
A displacement detection device, operated on a working surface, the displacement detection device comprising:
- an image sensor configured to detect reflected light from the working surface and successively output image frames;
- a processing unit configured to identify a hovering height and calculate a first axis displacement and a second axis displacement according to the image frames;
- and
- an output unit controlled by the processing unit and configured to output a first ratio of the first axis displacement but not to output the second axis displacement when the hovering height is higher than a predetermined height,
- wherein the first ratio is 50%-100%.
Dependencies are inferred from the claim text.