Direct type backlight module

Abstract

The invention discloses a direct type backlight module. The direct type backlight module comprises a blue light LED lamp panel, a fluorescent film and an optical film set from bottom to top. The fluorescent film at least comprises a first light conversion mechanism and a second light conversion mechanism, wherein a second color emitted by the first light conversion mechanism mainly occupies a relative middle wavelength part of a visible spectrum; a third color emitted by the second light conversion mechanism mainly occupies the relatively long wavelength part of the visible spectrum; the firstlight conversion mechanism and the second light conversion mechanism are alternately arranged; and the first light conversion mechanism and the second light conversion mechanism realize light wavelength conversion of LED blue light through quantum dots. The present invention achieves a high color gamut display device capable of extending lifetime, improving mass productivity, and / or improving perceptible resolution of the display device without perceptible degradation in display quality.

Description

technical field [0001] The invention relates to a display device, in particular to a direct-type backlight module. Background technique [0002] With the rapid development of display technology, people's demand for displays is getting higher and higher, especially for non-planar display devices such as flexible liquid crystal displays, curved liquid crystal displays, flexible liquid crystal displays and foldable liquid crystal displays. Flexible LCD panels are about to become the mainstream in the display field due to their thinness, bendability, and impact resistance. However, the liquid crystal display device is a non-self-luminous display device, which needs to be matched with a backlight to realize display, which greatly increases the difficulty of flexible display. How to realize flexible backlighting has always been a difficult problem to solve. [0003] The direct-type backlight module is directly arranged behind the liquid crystal display panel, which has the advan...

AI Technical Summary

Problems solved by technology

Different from the light guide plate backlight system of the side-lit backlight, the Mini-LED direct-down backlight module has no light guide plate design, but returns light by coating white reflective ink (that is, white oil) on the driving substrate. The reflective properties of white oil make the reflected light and the incident light usually have the same angle, either re-enter the brightness enhancement film after reflection and be fully reflected back again, or be reflected to the low reflection area of ​​the driving substrate (such as the surface of Mini-LED, Mini- The space between the LED and the white oil) is lost, resulting in a large loss in the overall light return efficiency, and the light output efficiency is not high

These flexible Mini-LED backlight technologies are difficult to implement. On the one hand, they are out of touch with the traditional backlight technology. On the other hand, the manufacturing cost is high and the yield rate is low.

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