Patent ID: 8692737

Claim:
A direct-viewing type display device comprising: at least one display panel including a display region and a frame region provided outside the display region, with a boundary extending along a first direction between the display region and the frame region, the display region having a plurality of pixels arrayed therein; and at least one light-transmitting cover disposed on a viewer's side of the at least one display panel, wherein the at least one light-transmitting cover includes a lens portion disposed astride the boundary to refract a portion of light going out from the display region toward the frame region, the lens portion refracts the portion of light so that light emitted from the plurality of pixels in the display region has a substantially equal pitch on a plane which is perpendicular to the first direction, and a line of intersection between the plane which is perpendicular to the first direction and a viewer-side surface of the lens portion is a curve which is not a circular arc, the line of intersection is the curve defined by an aspherical function, the at least one light-transmitting cover includes, in a portion other than the lens portion, a flat plate portion whose viewer-side surface is composed of a face which is substantially parallel to a display plane of the at least one display panel, in the display region, the plurality of pixels are arranged at an equal interval along a second direction which is perpendicular to the first direction, a display signal supplied to a pixel emitting light entering the lens portion is uniformly compressed along the second direction relative to a display signal supplied to a pixel emitting light entering the flat plate portion, and a conic constant k of the aspherical function is substantially in accordance with the following equation, where a is a compression rate of the display signal supplied to the pixel emitting light entering the lens portion (0<a<1): k= 89.918 a 4 −194.57 a 3 +159.82 a 2 −57.099 a+ 7.1865.