Patent ID: 8226256

Claim:
A display unit comprising: a plurality of display devices; and a plurality of light guiding parts respectively opposing each display device, each of the light guiding parts being formed of a same sealing substrate so as to be a unitary structure and having a refractive index of ‘n 2 ’, wherein, each of the light guiding parts has a trapezoid shaped cross section, each of said light guiding parts comprises (a) a substantially planar incident face of width ‘a,’ said incident face being substantially parallel to a surface of each display device and proximate to each display device, and (b) an emitting face of width ‘p’ on an opposite side of each light guiding part, separated from the incident face by a distance ‘d’, sides of said light guiding parts are defined by regions of said sealing substrate where portions of said sealing substrate are absent, at least one side of each light guiding part extends from the incident face of the light guiding part to the emitting face of the light guiding part and has a reflective face, a value ‘u 1 ’ represents a maximum angle of light entering the incident face, a value ‘u 2 ’ represents a maximum angle of light which is reflected by the reflective face and then is emitted from the emitting face, a value α represents a view angle of each display device said view angle being less than 60 degrees, and values of ‘n 2 ’, ‘a’, ‘p’, ‘d’, ‘u 1 ’, and ‘u 2 ’ are such so as to satisfy the following relationships n 2×sin [ a tan {( p+a )/2 d }]<sin α, (1) n 2×sin( u 2)<sin α, (2) and n 2×sin( au 1 /p )<sin α. (3)