The invention discloses a method for designing an ultrathin highlight wide-viewing-angle face-change liquid crystal display module. The liquid crystal display module mainly comprises a backlight film, a backlight plate, an upper iron frame, a lower iron frame, a reflecting film, a glued frame, a backlight FPC and the like. The installation of the liquid crystal display module is implemented by the following steps: firstly, mounting the backlight FPC component welded with an LED, gluing frame and then sleeving the glued frame with the lower iron frame; secondly, mounting the reflecting film, the backlight plate and the backlight film and sticking black and white light shielding tapes to form a closed backlight system; and finally, mounting an LCD to form an ultrathin highlight wide-viewing-angle face-change liquid crystal screen module without the upper iron frame and TP. The screen module can be used in designing of bar, slide and special mobile phones according to mobile phone products. A small size screen can be matched with a large size touch screen according to the actual touch screen need condition and used together with screen printing, sputtering coating and other processes or special backlight effect as well as mobile phone MMI design and ID style design. The thickness of the body screen (with iron frame, but without gum) is 2 millimeters, and the maximum thickness of the body screen (including 0.1 millimeter of gum) with TP is 3.35 millimeters and is 0.65 millimeters smaller than the 4.0 maximum thickness of the prior 2.4 welded standard screen. The FPC and elements are covered in the iron frame. The brightness of the screen with the TP is 350cd/m2 and the brightness of the screen without the TP is 430cd/m2. The screen module has the advantages of unique photoelectric property index, ESD/EMI/EMC properties, ultra thinness, excellent mechanical performance, simple structure, low cost, convenient use, high general utilization and excellent compatibility.