Method and backlight module that achieve high color satuationof LCD (liquid crystal display) device

A backlight module for achieving high color saturation of an LCD (Liquid Crystal Display) device, comprising a notch filter, wherein light of backlighting of the LCD device is subjected to light filtering by the notch filter and then enters a liquid crystal cell of the LCD device, the notch filter having a cut-off central wavelength of 500-640 nanometers, the cut-off wave band of the half peak width being 10-120 nanometers, the notch filter having a thickness of 0.3-15 millimeters;

• wherein the backlight module of the LCD device comprises YAG LED (Light-Emitting Diode);
• wherein the backlight module comprises a backplane that comprises bottom board and a side board connected to the bottom board to define a receiving space, wherein a backlight source that is operable to emit the backlighting and the notch filter by which the backlighting is filtered before entering the liquid crystal cell of the LCD device are received in the receiving space;
• wherein the backlight source comprises a plurality of LED light bars each of which comprises a plurality of LEDs distributed along the light bar at a fixed interval to emit the backlighting, the LEDs comprising the YAG LED;
• and
• wherein a diffuser plate is mounted to the side board of the backplane and the notch filter is arranged in the receiving space at a location on or above the backlight source.