1. A dual-view image display device comprising: a signal input module receiving a video signal having a frame image that is split into two first images; a video processing module electrically connected to the signal input module, with the video processing module comprising a nonlinear processing module, with the video processing module processing the video signal received from the signal input module to obtain the two first images and then using the nonlinear processing module to horizontally or vertically split each of the two first images which are enlarged into a number of enlarged areas, wherein when the number of enlarged areas is a positive even number M, the number of enlarged areas is arranged in sequence as below: S M/2 S M/2−1 S M/2−2 ,. .. , S 2 , S 1 , S 1 , S 2 ,. .. , S M/2−2 S M/2−1 S M/2 and when the number of enlarged areas is a positive odd number N, the number of enlarged areas is arranged in sequence as below: S (N+1)/2 , S (N+1)/2−1 , S (N+1)/2−2 ,. .. , S 2 , S 1 , S 2 ,. .. , S (N+1)/2−2 , S (N+1)/2−1 , S (N+1)/2 , and to interpolate pixels to each enlarged area to obtain two fullscreen second images; a dual-view processing module electrically connected to the video processing module, wherein when the number of enlarged areas is the positive even number M, then an order of sizes of the number of enlarged areas is S M/2 >S M/2−1 >S M/2−2 >. .. >S 2 >S 1 and when the number of enlarged areas is the positive odd number N, then an order of sizes of the number of enlarged areas is S (N+1)/2 >S (N+1)/2−1 >S (N+1)/2−2 >. .. >S 2 >S 1 with the dual-view processing module processing the two fullscreen second images outputted from the video processing module; and a display module electrically connected to the dual-view processing module, with the display module displaying the two processed fullscreen second images outputted from the dual-view processing module.