Computer input device with time-difference-type bi-coordinate output, time-difference-type data input processing method, and sensor thereof

A time-difference-type data input processing method of a computer input device, applicable to an input processing between the computer input device with an optical sensing window and a computer, the method comprising:

• turning on a first light source to produce a first projecting beam to the optical sensing window;
• providing a sensor module to receive a reflected light of the first projecting beam, so as to obtain a first image data;
• turning off the first light source, and turning on a second light source to produce a second projecting beam to a working surface;
• receiving a reflected light of the second projecting beam by the sensor module, so as to obtain a second image data;
• provide a control unit to compare the first image data obtained at different time points to compute a first displacement data, and compare the second image data obtained at different time points to compute a second displacement data;
• and
• storing the first displacement data and the second displacement data into a storage unit.

A sensor with a time-difference-type bi-coordinate output, comprising:

• a first optical module, for producing a first projecting beam to an optical sensing window in an alternating on and off manner;
• a second optical module, for producing a second projecting beam to a working surface when the first optical module is turned off, and stopping producing the second projecting beam to the working surface when the first optical module is turned on;
• and
• a sensor module, for sequentially controlling an alternating on and off of the first and second optical modules, and receiving a reflected light of the first projecting beam and a reflected light of the second projecting beam.