A head-mounted display device includes a display panel including a plurality of pixels for displaying an image, a filter on the display panel, and including a scattering layer for scattering the image to generate a scattered image, the scattering layer including a base having a first refractive index, and scattering particles mixed with the base and having a second refractive index that is greater than the first refractive index, and an optical system on the filter for magnifying the scattered image.