Flexible mini-led backlight board and its flexible electronic devices

Abstract

The present invention provides a flexible mini-LED backlight board that does not need to be provided with a light guide plate, a diffusion film or a reflector, which includes an FPC drive board and a mini-LED chip array electrically connected to the FPC drive board. ‑The LED chip array is provided with a stack of at least three positive refractive index films whose refractive index decreases sequentially from bottom to top. The flexible mini-LED backlight panel of the present invention increases the reflective optical path by setting up at least three positive refractive index films whose refractive indices n1, n2, and n3 decrease sequentially from bottom to top on the mini-LED chip array. And the light guide and diffusion of the plane where the flexible mini‑LED backlight panel is located realizes adjustable uniform light effect, eliminates the Mura lamp eye phenomenon, and improves the light uniformity and light energy utilization efficiency of the surface light source.

Description

technical field [0001] The invention relates to a display device, in particular to a flexible mini-LED backlight board and a flexible display electronic device thereof. 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...

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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