Quantum dot composite film and preparation method thereof

Abstract

The invention discloses a quantum dot composite film and a preparation method thereof. The quantum dot composite film is of an integrated laminated structure and comprises a quantum dot film, a scattering layer and a first prism layer. The scattering layer is deposited on the upper surface of the quantum dot film and comprises photosensitive resin and at least two kinds of scattering particles; the scattering particles are dispersed in the photosensitive resin, and for the scattering particles with the largest particle size, the particle size is 200-500 nm; for scattering particles with the smallest particle size, the particle size is 50-150nm; the multiple range of the particle sizes of different kinds of scattering particles is 1-4; the first prism layer is deposited on the upper surface of the scattering layer in a patterning mode and comprises a plurality of microprisms arranged in an array mode. According to the composite film, the adverse effect of assembly of multiple optical films on the quantum dot backlight structure and the light emitting effect of an LCD panel is avoided, and the industry development requirements of lightening and thinning are met. The preparation method is used for preparing the quantum dot composite film, an all-solution printing technology is adopted, the technological process is simpler, the preparation cost is reduced, and the industrial production requirement is met.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to a quantum dot composite film and a preparation method thereof. Background technique [0002] As a new type of luminescent material, quantum dots have important applications in various display devices due to their advantages such as wide absorption spectrum, narrow fluorescence emission spectrum, adjustable size, and solution processing. For example, quantum dot light-emitting diodes with quantum dots as the light-emitting layer, Mini-LEDs and Micro-LEDs with quantum dots as the light conversion layer. However, due to the short life of blue light quantum dots and the current development status of the display technology industry, the current TFT-LCD technology will still become the mainstream display technology in the next 10-20 years. Red and green quantum dots are prepared into quantum dot film, and the quantum dot backlight structure with ordinary blue light source is a...

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Problems solved by technology

[0004] However, the existing quantum dot backlight structure still has the following defects: (1) Various optical films are arranged independently of each other, and because the structural differences of each film are microscopic differences, the process of assembly is not only complicated, but also very easy Error; (2) Due to the independent arrangement of optical diaphragms and the influence of the structure of the diaphragm itself, regardless of mechanical or manual assembly, it is very easy to cause the diaphragm to bend or scratch, thereby affecting the final light output effect; and affecting the entire backlight adverse impact on the cost and yield of the structure

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