1. A method of RGBW compensation based on a color aberration of a white subpixel, wherein color aberration exists between a color coordinate point Ws of the white subpixel of an image pixel on a RGBW panel defined in a RGBW color space and a standard white color coordinate point Wd in an sRGB system before compensating, the method comprising the following steps: supplying first data of the image pixel defined in the RGBW color space, which includes color coordinates of each of a red subpixel, a blue subpixel, a green subpixel, and a white subpixel of the image pixel on the RGBW panel and respectively define a red color coordinate point Rs, a blue color coordinate point Bs, a green color coordinate point Gs, and the white color coordinate point Ws in the RGBW color space; processing the color coordinates of the red, blue, green, and while subpixels of the image pixel on the RGBW panel to define a triangle RsGsBs with vertices being defined by the color coordinate points Rs, Gs, and Bs of the red subpixel, the green subpixel and the green pixel of the image pixel, the triangle being divided into three triangular regions, which are respectively defined as a first triangular region RsGsWs, a second triangular region GsBsWs, and a third triangular region BsRsWs, having vertices respectively defined by the red, green, and white color coordinate points Rs, Gs, Ws, the green, blue, and white color coordinate points Gs, Bs, Ws, and the blue, red, and while color coordinate points Bs, Rs, Ws, with the white color coordinate point Ws as a center point; determining one of the three triangular regions, RsGsWs, GsBsWs, and BsRsWs, where the standard color coordinate point Wd is located, wherein the three vertices of the one of the three triangular regions include the center point Ws and two outer points, which are two of the red, green, and blue color coordinate points Rs, Gs, Bs; compensating the white subpixel by applying a predetermined normalized proportion operation to the first data of the color coordinates corresponding to the two outer points of the one of the three triangular regions in order to correct the first data to form second data of the image pixel; outputting the second data of the image pixel based on the RGBW color space; wherein the predetermined normalized proportion operation is carried out as follows: when the one of the three triangular regions in which the standard white color coordinate point Wd is located is the triangular region GsBsWs, calculating a normalized proportion of luminance among the blue subpixel, green subpixel and white subpixel as BsY, GsY, WsY, wherein BsY+GsY+WsY=1; applying the normalized proportion BsY, GsY, WsY to correct the first data to obtain the second data of the image pixel based on the RGBW color space, where 
 Rfo ( i )= Ro ( i ), 
 Gfo ( i )= Go ( i )+ Wo ( i )* GsY ( i ), 
 Bfo ( i )= Bo ( i )+ Wo ( i )* BsY ( i ), and 
 Wfo ( i )= Wo ( i )* WsY ( i ), wherein Ro(i), Go(i), Bo(i), and Wo(i) are the first data of a pixel point i, Rfo(i), Gfo(i), Bfo(i), and Wfo(i) are the second data of the pixel point i, BsY(i), GsY(i), and WsY(i) represent the normalized proportion of luminance among the blue subpixel, the green subpixel and the white subpixel of the pixel point i.