Abstract: A color conversion sheet according to the present invention includes a first wavelength conversion layer in which an organic phosphor is dispersed in a resin matrix, a first phosphor diffusion barrier layer positioned on one surface of the first wavelength conversion layer, and an adhesive layer positioned on one surface of the first phosphor diffusion barrier layer, wherein a Hildebrand solubility parameter of the first phosphor diffusion barrier layer satisfies a predetermined relationship between a Hildebrand solubility parameter of the resin matrix of the first wavelength conversion layer and a Hildebrand solubility parameter of a solvent contained in the first phosphor diffusion barrier layer, thereby resolving problems of changes in luminance characteristics and color change.

Abstract: Disclosed herein is a headrest for vehicles, which can fixedly support the passenger's head including the mandible in an automobile crash, thereby preventing hyper-flexion of the neck. The headrest comprises a pair of support rods fitted at the top of a backrest of an automotive vehicle seat, first and second cushion units rotatably fitted at the top of the respective support rods, respectively, at least one elastic member for elastically connecting the first and second cushion units, jaw-restraint portions formed at opposite sides of the first and second cushion units, respectively, and stoppers for keeping the support rods in an immobilized state after the first and second cushion units are rotated to a predetermined degree. By using the headrest of the present invention, it is possible to minimize injury to the neck of the passenger.