Backlight module and liquid crystal display

Abstract

The invention discloses a backlight module and a liquid crystal display. The backlight module comprises a back plate, a light source arranged on the back plate, and a fluorescent film arranged above the light source, and fluorescent particles are distributed in the fluorescent film and are used for scattering light emitted by an LED, wherein the distribution density of the fluorescent particles gradually decreases from the center to the periphery of an area in the area of each LED corresponding to the fluorescent film. Based on the backlight module, the uniformity of brightness of emergent light of the backlight module is improved, and the large viewing angle display quality of an LCD is improved.

Description

technical field [0001] The invention relates to the display field, in particular to a backlight module and a liquid crystal display. Background technique [0002] The backlight module usually uses LED (Light Emitting Diode, light emitting diode) as the light source, for example figure 1 As shown, in the direct-lit backlight module 10, the light emitted by the light source 11 is diffused by a diffuser plate (Diffuser plate, DP) 12 and transmitted upwards, and then diffused and integrated by various optical films 13 to form a uniform Surface light source, and provided to the liquid crystal panel of LCD (Liquid Crystal Display, liquid crystal display). Wherein, although the prism sheet (BEF, Brightness Enhancement Film) in the optical film 13 can increase the display brightness of the LCD, its light concentrating effect will reduce the display viewing angle of the LCD, for example, at 1 / 3 brightness (1 / 3 of the brightness of the front viewing angle). 3) When the display viewi...

AI Technical Summary

Problems solved by technology

However, in the backlight module 20 based on this technology, there is more blue light in the area directly above the light source 21, and the light transmission path is shorter, and the number of times the blue light is scattered is less, resulting in the LCD in the area directly above the light source 21. On the other hand, in the area directly above the light source 21, such as between two adjacent light sources 21, there is less blue light, and the light transmission path is longer, and the blue light is scattered more times, causing the LCD to turn yellow in this area, thus making the backlight The brightness of the light emitted by the module 20 is uneven, and mura (uneven display brightness) is prone to occur, which affects the improvement of the display quality of the LCD when it is displayed at a large viewing angle

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