1. An optical vision chip (OVC) comprising: a display device having a first sub pixel and a second sub pixel, the first sub pixel displaying an object image, the second sub pixel displaying a standard model image; and an optical sensor having a sensor pixel, the optical sensor optically coupling the object image and the standard model image respectively displayed on the first and second sub pixels and outputting a difference between the object image and the standard model image as an electrical signal, wherein the first and second sub pixel are disposed side by side to collectively form a pixel that has the same size as the sensor pixel, wherein the display device and the optical sensor are sequentially stacked, such that the sensor pixel is in contact with both a top surface of the first sub pixel and a top surface of the second sub pixel.