DPI (dots per inch) is the number of pixels per inch, while CPI (dots per inch) is the number of measurements per inch. In principle, the latter is an index to measure the performance of the mouse, that is, how many instructions will be sent to the computer every inch the mouse moves on the plane.
The refresh rate FPS is the parameter value that the optical engine of the mouse feeds back to the MCU (Micro Control Unit) of the mouse at the speed of frames per second. FPS measures the amount of information used to save and display dynamic video. The more frames per second, the smoother the action displayed. Generally speaking, the minimum value you need to avoid is 30. Some computer video formats can only provide 15 frames per second.
The rate of return is the signal value fed back to the host after processing by the single chip microcomputer (micro-control unit). His unit is hertz. For example, if the return rate is 125Hz, it can be simply thought that the single chip microcomputer sends data to the computer every 8 milliseconds, and 500Hz sends data every 2 milliseconds.
Extended data:
Douglasasengelbart invented the mouse in 1964, when he was working in the Stanford Research Institute sponsored by Stanford University. At that time, there was no name "mouse", but the new equipment was a small wooden box with two rollers but only one button. Its working principle is to turn a shaft driven by a roller to make the rheostat change its resistance.
The change of resistance value will produce displacement signal, which will be processed by computer to move the cursor indicating the position on the screen.
Because this device drags a long line like a mouse's tail, douglas engelbart and his colleagues call it a mouse in the laboratory. He imagined that this kind of mouse might be widely used in the future.
Therefore, when applying for patent, it is called "X-Y position indicator of display system". Although people found the name "mouse" more familiar, they got the name "mouse".