A liquid crystal display panel, in which pixel units are provided on the liquid crystal display panel, each pixel unit includes sub-pixel units displaying different colors, at a position of the apposed substrate or the array substrate corresponding to the sub-pixel unit of at least one color in each pixel unit, a monochromatic quantum dot layer is disposed. This liquid crystal display panel has increased color gamut of the liquid crystal display panel, enhanced color saturation, increased display quality, and increased life of quantum dots. A display device and a process for patterning the monochromatic quantum dot layer are also provided.