An image compensating portion located on a display panel includes a light incident surface, a light emitting surface, and a plurality of light guiding channels parallel with each other. The display panel includes a main display region and a periphery display region. A projection of the light emitting surface on the light incident surface is larger than an area of the light incident surface. The light guiding channel guides lights from the light incident surface to be emitted from the light emitting surface for being extended.