Display backlight module and method for the same

A display backlight module adapted to an LCD device, comprising:

• a direct-type backlight source module, comprising:
• a light source;
• a light-reflecting plate, coupled with the light source, for reflecting a downward light from the light source;
• a multi-layer reflective film, disposed on a light-emitting surface of the direct-type backlight source module, and formed of multiple inter-stacked polymer films with difference refractive indexes, and an interference principle being incorporated to reflecting or transmitting the light with a specific wavelength range;
• wherein the multi-layer reflective film has a first surface and a second surface, a surface structure having a plurality of diffusing particles is formed on the first surface or the second surface;
• the multi-layer reflective film is adhered with an ultraviolet reflector with additive transparent plastic particles for reflecting ultraviolet radiation;
• a reflective cavity being defined between the multi-layer reflective film and the light-reflecting plate, and multiple reflections, refractions and scatterings of the light are created within the reflective cavity;
• and
• an optical film module, disposed between the direct-type backlight source module and a liquid crystal display panel, and at least one brightness-enhancement film and a diffusion film are included.

A method for manufacturing a display backlight module, comprising:

• preparing a liquid crystal display panel;
• assembling an optical film module on one surface of the liquid crystal display panel, wherein the optical film at least includes a diffusion film and a brightness-enhancement film;
• and
• forming a backlight source module, which includes a light source and a light-reflecting component, on one side of an assembly of the liquid crystal display panel and the optical film module;
• within the backlight source module, forming an ultraviolet reflector for reflecting the unnecessary ultraviolet radiation;
• wherein, a light-emitting surface of the backlight source module is disposed with a multi-layer reflective film, and the multi-layer reflective film is formed of multiple inter-stacked polymer films with different refractive indexes by a co-extrusion process;
• upon the multi-layer reflective film coating a surface structure on one surface of the multi-layer reflective film;
• an interference principle is incorporated to reflecting or transmitting the light with a specific wavelength range;
• a reflective cavity is defined between the light-reflecting component and the multi-layer reflective film, and multiple reflections, refractions, and scatterings of the light are created within the reflective cavity.