A method obtains an original point-cloud of the object, filters discrete points from the original point-cloud, determines a first sub-point-cloud and a second sub-point-cloud from the filtered point-cloud, and creates an updated point-cloud of the object based on the first sub-point-cloud and the second sub-point-cloud, determines points to be fitted from the updated point-cloud. The Bluetooth protocol is used to communicate between the cellular phone and the car kit. Accordingly, a flux of light being transmitted through the pixel region of the liquid crystal display panel can be improved significantly.