A preparation method of quantum dot color filter film based on self-assembly

Abstract

The invention relates to a method for preparing a self-assembly based quantum dot color filter. The method includes: forming a first electrode on a substrate; forming a blank matrix; mixing quantum dots and a surfactant to prepare a red and green quantum dot charging size or solution, wherein the surfactant can modify surfaces of the quantum dots, the modified quantum dots have positive charges ornegative charges; manufacturing red quantum dots and green quantum dots on positions of red and green pixel points through silk-screen printing, transferring or ink-jet printing; placing second electrodes on the pixel points after the red and green pixel points are formed, applying an electric field between the first electrode and the second electrodes, allowing the red and green quantum dots inthe red and green pixel points to tightly attach to a surface of the first electrode under the action of the electric field through a self-assembly method, and allowing the quantum pots to be tightlyarranged together layer-by layer. Light leakage of the quantum dot color film due to clearances between the quantum dots can be avoided, the light utilization rate and the brightness of the light penetrating the quantum dot color filter substrate can be greatly improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a preparation method of a quantum dot color filter film based on self-assembly. Background technique [0002] With the development of display technology, liquid crystal displays (Liquid Crystal Display, LCD) and other flat-panel display devices have the advantages of high image quality, power saving, thin body and wide application range, and are widely used in mobile phones, TVs, notebook computers , desktop computers and other consumer electronics products have become the mainstream of display devices. [0003] With the improvement of people's living standards, more stringent requirements are put forward for the performance of liquid crystal displays, such as high brightness, high color gamut, and wide viewing angle. Therefore, it is necessary to find new materials that meet the requirements. Nano-quantum dots, a new type of semiconductor material, have attracted the attention...

AI Technical Summary

Problems solved by technology

The color filter substrate mainly includes the base substrate, black matrix, red, green and blue pixels. The color filter substrate composed of red, green and blue color filters is an important part of the liquid crystal display. This color is mainly composed of red, green, blue phosphors or red, green, blue resins, but its brightness and color gamut are not comparable to quantum dots

[0005] In CN 101034175 B, researchers propose a color filter substrate and a display device formed thereof, in which red, green and blue pixels are prepared by "subtraction principle", that is, a layer of red photoresist is spin-coated by spin-coating, and the different The required parts are photolithographically removed to form a red color filter film, and then green and blue color filter films are prepared sequentially. Although this method can produce red, green and blue pixels, the preparation process is complicated, the production cost is high, and the raw material utilization rate is high. Low, and it does not take into account the problem of light leaking from the gap between dye molecules inside the pixel

In CN 101515081 B, researchers mentioned a color filter substrate and its manufacturing method, in which red, green and blue resins are used as red, green and blue pixels, and a reflective matrix is ​​set in the black matrix as a reflective layer to disperse part of the external incident light. But it also doesn't take into account the phenomenon of light leaking through the gaps between the dye molecules

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