Abstract: A method of a navigation sensor circuit includes: monitoring at least one polling request signal sent from a microcontroller during a variable time interval, wherein the microcontroller is externally coupled to the navigation sensor circuit; calculating at least one polling rate of the microcontroller according to the at least one polling request signal; and dynamically adjusting a sensor frame rate of the navigation sensor circuit according the at least one polling rate, wherein an image sensor of the navigation sensor circuit operates and captures images to generate and output displacement data based on the sensor frame rate.

Abstract: A method for reducing jitter of an optical sensor when in a stationary condition includes: receiving a plurality of raw delta; comparing a movement of the optical sensor with a predetermined threshold; and when the movement is less than the predetermined threshold, entering a dynamic downshift mode, including: storing raw delta into a buffer; when the buffer is not full, outputting the raw delta as reported delta; and when the buffer is full, calculating an average of the total raw delta stored in the buffer, and outputting the average delta as reported delta.

Abstract: A method for reducing jitter of a mouse when in a stationary condition, including: receiving a plurality of raw delta; comparing a movement of the mouse with a predetermined threshold; and when the movement is less than the predetermined threshold, entering a dynamic downshift mode. Entering the dynamic downshift mode includes: storing raw delta into a multi-tap buffer; when the multi-tap buffer is not full, outputting the raw delta as reported delta; and when the multi-tap buffer is full, calculating an average of the total raw delta stored in the multi-tap buffer, and outputting the average delta as reported delta.

Abstract: A method of a navigation sensor circuit includes: monitoring at least one polling request signal sent from a microcontroller during a variable time interval, wherein the microcontroller is externally coupled to the navigation sensor circuit; calculating at least one polling rate of the microcontroller according to the at least one polling request signal; and dynamically adjusting a sensor frame rate of the navigation sensor circuit according the at least one polling rate, wherein an image sensor of the navigation sensor circuit operates and captures images to generate and output displacement data based on the sensor frame rate.

Abstract: An optical mouse includes a pixel array and a light source. A method for determining when the optical mouse is in a lifted condition above a surface includes: accumulating pixel values of a first column of the pixel array, the first column being closest to the light source; accumulating pixel values of a second column of the pixel array, the second column being different from the first column; comparing the accumulated pixel values of the first column with the accumulated pixel values of the second column; and when a difference between the accumulated pixel values of the first column and the accumulated pixel values of the second column is greater than a threshold value, determining the optical mouse to be in a lifted condition.

Abstract: An optical navigation device comprising: a first optical sensing region, having a first power consumption rate; and a second optical sensing region, having a second power consumption rate higher than the first power consumption rate. The optical navigation device applies the first optical sensing region to sense first optical data when the optical navigation device moves for a first speed, and the optical navigation device applies the second optical sensing region to sense second optical data when the optical navigation device moves for a second speed higher than the first speed.

Abstract: An optical mouse includes a pixel array and a light source. A method for determining when the optical mouse is in a lifted condition above a surface includes: accumulating pixel values of a first column of the pixel array, the first column being closest to the light source; accumulating pixel values of a second column of the pixel array, the second column being different from the first column; comparing the accumulated pixel values of the first column with the accumulated pixel values of the second column; and when a difference between the accumulated pixel values of the first column and the accumulated pixel values of the second column is greater than a threshold value, determining the optical mouse to be in a lifted condition.

Abstract: A method applied into an optical navigation device, used to communicate with a remote computer device based on a transmission interface, includes: capturing image frames according to a specific frame rate to obtain actual displacement data corresponding to the captured image frames, the specific frame rate being lower than a specific reporting rate specified by the transmission interface; generating predicted displacement data based on the actual displacement data; using the actual displacement data and the predicted displacement data to form resultant displacement data which is to be outputted; and outputting the resultant displacement data to the remote computer device based on the specific reporting rate specified by the transmission interface.

Abstract: An optical mouse includes a pixel array and a light source. A method for determining when the optical mouse is in a lifted condition above a surface includes: accumulating pixel values of a first column of the pixel array, the first column being closest to the light source; accumulating pixel values of a second column of the pixel array, the second column being different from the first column; comparing the accumulated pixel values of the first column with the accumulated pixel values of the second column; and when a difference between the accumulated pixel values of the first column and the accumulated pixel values of the second column is greater than a threshold value, determining the optical mouse to be in a lifted condition.