Optical nagivation device

摘要

An optical navigation device may have an adaptive sleep mode for preventing unwanted scrolling inputs. A motion indicator may move a device between a sleep mode and an active mode. According to the sleep mode, a number of different sleep states are defined which have further reduced frame rates. The device may be only woken from the deeper sleep modes once repeated motion events are detected. This may prevent the device from being woken accidentally, while preserving the user experience.

主权项

1. An optical navigation device comprising:
a touch input surface; an optical source configured to direct optical radiation towards said touch input surface, the optical radiation to be reflected from an object adjacent said touch input surface; an image sensor comprising
a pixel array configured to capture a plurality of images from said touch input surface, anda processor coupled to said pixel array and configured to detect at least one motion event associated with the object from the plurality of images; said image sensor configured to operate in one of a sleep mode for holding a motion indicator in a first state, and an active mode for setting the motion indicator to a second state different from the first state; said processor configured to, while in the sleep mode,
detect a first motion event,buffer motion data derived from the first motion event, andchange from the sleep mode to the active mode and provide the buffered motion data to be read external of the optical navigation device when a second motion event is detected within a first time period from the detection of the first motion event, but remain in the sleep mode and discard the buffered motion data if at least one pixel in said pixel array is saturated.