Fluorescent film applied to backlight module and preparation method thereof

Abstract

The invention relates to the field of optical thin films, in particular to a fluorescent film applied to a backlight module. In order to overcome the defects that a white-light LED obtained by encapsulating yellow fluorescent powder and blue-light LEDs together is high in price, short in service life and not environmentally friendly, the fluorescent film applied to the backlight module with blue-light LEDs as light sources is provided. The fluorescent film comprises a fluorescent layer, an upper isolation layer, a lower isolation layer and a diffusion layer. The fluorescent layer is composed of fluorescent powder and adhesive substances. The lower isolation layer is coated with the fluorescent layer, the fluorescent layer is composited with the upper isolation layer, and the diffusion layer is arranged on the upper surface of the upper isolation layer. The fluorescent powder is the yellow fluorescent powder, and the fluorescent layer comprises the following materials of 100 parts of tackiness agents and 5 to 30 parts of the yellow fluorescent powder. The fluorescent film has the advantages of being environmentally friendly, improving brightness, adjusting chromaticity, lowering cost and the like.

Description

technical field [0001] The invention relates to the field of optical films, in particular to a fluorescent film applied to a backlight module. Background technique [0002] The backlight module is one of the important components of the liquid crystal display, which can provide uniform and stable light. The backlight module is mainly composed of a light source, a reflector, a light guide plate, a diffusion film, a prism film, etc. The light emitted by the light source often determines the colors that the liquid crystal display can display. There are two main types of light sources for liquid crystal displays on the market: cold cathode fluorescent lamps (cold cathode fluorescent lamps, CCFL) and light emitting diodes (light emitting diodes, LEDs). [0003] Since liquid crystal displays need to display rich colors, the backlight module needs to be able to provide white light. Due to technical limitations, there are no pure white LEDs on the market. Now most of the LED light ...

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Problems solved by technology

[0004] In order to solve the existing defects of high price, short service life and environmental protection of white LEDs obtained by packaging yellow phosphor powder and blue LEDs together, the present invention provides a fluorescent film applied to backlight modules using blue LEDs as light sources , the blue light emitted by the blue LED excites the fluorescent film to emit yellow light, and finally a mixed white light is obtained. The fluorescent film has the advantages of environmental protection, improving brightness, adjusting chromaticity, and reducing costs.

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