Display unit
A display unit which the view angle is limited and the front luminance is improved is provided. The display unit includes a display device, and a light guiding part which is provided to face the display device, has an incident face on the side opposing to the display device, an emitting face on the opposite side of the display device, and a reflective face on the side face, and has a cross section expanding from the incident face to the emitting face.
1. 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)
2. The display unit according to claim 1 , wherein said view angle is less than 30 degrees.
3. The display unit according to claim 1 , wherein the reflective face comprises a reflective film.
4. The display unit according to claim 1 , wherein each display device is an organic light emitting device including an organic layer having a light emitting layer between a first electrode and a second electrode.
5. The display unit according to claim 4 , wherein each of the display device has a resonator structure in which light generated in the light emitting layer is resonated between an end face of the first electrode and an end face of the second electrode.
6. The display unit according to claim 1 , wherein each display device is provided on a driving substrate and the sealing substrate is oppositely arranged over a side where the display device is provided on the driving substrate.