Functional film capable of transmitting blue light and reflecting red and green light and preparation method thereof

Abstract

The invention relates to an optical film, in particular to a functional film capable of transmitting blue light and reflecting red and green light and a preparation method thereof in the field of quantum dot display. The functional film capable of transmitting the blue light and reflecting the red and green light and the preparation method thereof are used for increasing the utilization rate of the red and green light obtained by exciting red and green quantum dots in a quantum dot film by a blue light source. The functional film capable of transmitting the blue light and reflecting the red and green light sequentially comprises a scratch-resistant layer, a base material layer, an undercoat layer and a functional layer. The functional layer is composed of cholesteric liquid crystal molecules, a chiral agent, a photoinitiator and a polymerization inhibitor. By controlling the screw pitch of cholesteric liquid crystals formed in the functional layer, the functional film can selectively transmit the blue light within the wave range from 380 nm to 500 nm and reflect the red and green light within the wave range from 500 nm to 800 nm at the same time, and the good effects of selectivelytransmitting the blue light and reflecting the red and green light are achieved. The functional film not only can selectively transmit the blue light and reflect the red and green light but also hasexcellent optical properties such as high scratch resistance and high light transmittance.

Description

technical field [0001] The present invention relates to an optical film, and more specifically, to a functional film that transmits blue light and reflects red and green light and is used in the field of quantum dot display and a preparation method thereof. Background technique [0002] Quantum dot TV is a TV that uses quantum dot technology as a backlight source. Like traditional LCD display technology, quantum dot display is also a non-luminous display device that requires a backlight module to provide light. The difference between the two is that the traditional LCD uses white light as the light source, while the quantum dot liquid crystal display needs blue light to excite the red and green quantum dots in the quantum dot film to obtain red and green light, thus forming a white light source of red, green and blue primary colors, composed of quantum dots The excitation light source is the purest backlight, which realizes the revolutionary full-color gamut display and rest...

AI Technical Summary

Problems solved by technology

[0003] However, the direction of the red and green light obtained after the blue light source excites the red and green quantum dots in the quantum dot film is disordered. Form an effective light source; however, some excited red and green light are in the opposite direction to the excited blue light, which scatters back into the lamp cavity and cannot be received by the outside world, resulting in waste of red and green light, which is not conducive to the improvement of energy efficiency of quantum dot display devices

In order to improve the luminous efficiency of quantum dot films, the traditional method is to increase the intensity of the blue light source, which will inevitably lead to further waste of energy, which is not conducive to the promotion and application of quantum dot films, especially in the field of mobile display that requires low energy consumption.

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