A liquid crystal display device mainly includes an upper substrate, a lower substrate, a backlight module, an electrochromic electrode layer, an electrochromic layer, a common electrode layer, a liquid crystal layer, a pixel electrode layer, a thin film transistor (TFT) switching layer, and a storage capacitor layer. Subpixels of the liquid crystal display device can successively display red, green, and blue three primary colors at different times to enhance display resolution of the liquid crystal display device. Further, since the electrochromic device has better reflectivity and contrast, the image display effect can be enhanced.