Abstract: A neck fan and a fan assembly are provided. The fan assembly includes: a first air guiding assembly, configured to intake air and to generate an airflow; a second air guiding assembly, fluidly communicated to the first air guiding assembly and disposed at a downstream of the airflow generated by the first air guiding assembly. The second air guiding assembly comprises a plurality of static blades, the plurality of static blades are spaced apart from each other having an equal interval, the plurality of static blades are configured to concentrate the airflow and to guide the airflow to continue flowing.

Abstract: A neck fan includes an arc-shaped shell and a fan assembly. The arc-shaped shell is configured to be worn around a neck of a user. The shell has a first side and a second side opposite to the first side. Each of the first side and the second side defines air inlets. At least one of the first side and the second side defines air outlets. The shell further defines a receiving space, and the receiving space includes an air duct communicating with the air inlets and outlets. The fan assembly is received in the receiving space and configured to drive the air to flow from the air inlets of both sides, through the air duct, reaching the air outlets.

Abstract: A photomask and an exposure method are provided. The photomask includes a photomask body including a first surface and a second surface opposite to each other; and a first light-transmissive region penetrating through the first surface and the second surface, wherein a light adjustment component is in the first light-transmissive region and configured to converge a first light beam incident onto the first surface to a second light beam emergent from the second surface, and a cross-sectional area of the first light beam sectioned by the first surface is larger than that of the second light beam sectioned by the second surface.

Abstract: A white balance adjustment method and system for a display screen, and a display apparatus are provided. The white balance adjustment method includes: step S1, causing each pixel of at least a part of pixels of the display screen to display, with a preset grayscale, color images of sub pixels of all colors in the pixel in turn, and measuring chromaticity coordinate values and actual brightness values of the displayed color images; step S2, calculating an actual brightness ratio among actual brightness values of the sub pixels of all colors; calculating a standard brightness ratio among standard brightness values of the sub pixels of all colors when the display screen displays standard white light; and step S3, comparing the actual brightness ratio and the standard brightness ratio in case of the preset grayscale to obtain a comparison result, and adjusting grayscales of the sub pixels of all colors. (FIG.

Abstract: A photomask and an exposure method are provided. The photomask includes a photomask body including a first surface and a second surface opposite to each other; and a first light-transmissive region penetrating through the first surface and the second surface, wherein a light adjustment component is in the first light-transmissive region and configured to converge a first light beam incident onto the first surface to a second light beam emergent from the second surface, and a cross-sectional area of the first light beam sectioned by the first surface is larger than that of the second light beam sectioned by the second surface.