Display device
According to one embodiment, a display device includes an illumination unit, a polarizing element which transmits a specific polarized component of light entering from the illumination unit, a display panel which transmits the polarized light entering from the polarizing element while maintaining or converting a polarized state, an optical element comprising a transmission axis which transmits first linearly polarized light, which transmits or reflects the light entering from the display panel and a reflective element which retro-reflects the light reflected by the optical element, and the display panel and the reflective element face one surface of the optical element.
1. A display device comprising:
an illumination unit;
a polarizing element which transmits a specific polarized component of light entering from the illumination unit;
a display panel which transmits the polarized light entering from the polarizing element while maintaining or converting a polarized state;
an optical element comprising a transmission axis which transmits first linearly polarized light, which transmits or reflects the light entering from the display panel; and
a reflective element which retro-reflects the light reflected by the optical element; wherein
the display panel and the reflective element facing one surface of the optical element.
2. The display device of claim 1 , wherein
the polarizing element is absent between the display panel and the optical element.
3. The display device of claim 1 , further comprising:
a first retardation film provided on a side of the reflective element opposing the optical element, which imparts a phase difference to the light passing therethrough.
4. The display device of claim 1 , further comprising:
a second retardation film provided on a side of the optical element opposing the display panel and the reflective element, which imparts a phase difference to the light passing therethrough; and
a third retardation film provided on a side of the display panel opposing the optical element, which imparts a phase difference to the light passing therethrough.
5. The display device of claim 1 , further comprising:
a second retardation film provided on a side of the optical element opposing the display panel and the reflective element, which imparts a phase difference to the light passing therethrough; and
a fourth retardation film provided between the polarizing element and the display panel, which imparts a phase difference to the light passing therethrough.
6. The display device of claim 1 , wherein
the display panel further comprises:
a first substrate;
a second substrate disposed to oppose the first substrate;
a liquid crystal layer held between the first substrate and the second substrate;
a pixel electrode having light transmissivity; and
a common electrode opposing the pixel electrode and having light transmissivity.
7. The display device of claim 6 , wherein
the display panel further comprises a reflective layer having light reflectivity.
8. A display device comprising:
a reflector which reflects light;
an optical element which transmits or reflects reflected light from the reflector; and
a reflective element which retroreflects the light reflected by the optical element, wherein
the reflector and the reflective element face one surface of the optical element; and
a polarizing element is absent between the reflector and the optical element.
9. The display device of claim 8 , further comprising:
a first retardation film provided on a side of the reflective element opposing the optical element, which imparts a phase difference to the light passing therethrough.
10. The display device of claim 8 , wherein
the reflector comprises a retroreflective surface located on an opposite side to that opposing the optical element, which retro-reflects light entering from the optical element.
11. ; The display device of claim 8 , wherein
the reflector further comprises:
a first substrate;
a second substrate disposed to oppose the first substrate;
a liquid crystal layer held between the first substrate and the second substrate; and
a reflective layer having light reflectivity, disposed on the second substrate,
and
the optical element comprises a transmission axis which transmits first linearly polarized light, and reflects second linearly polarized light perpendicularly crossing the transmission axis.
12. A display device comprising:
a reflector which reflects light; and
an optical element which reflects reflected light from the reflector; wherein
the optical element reflects light entering from one side to a direction symmetrical to an incident direction on an other side with respect to the optical element as a plane of symmetry, and
the reflector further comprises a first substrate, a second substrate disposed to oppose the first substrate, and a liquid crystal layer held between the first substrate and the second substrate.
13. The display device of claim 12 , wherein
a polarizing element is absent between the reflector and the optical element.
14. The display device of claim 12 , wherein
the reflector comprises a retroreflective surface located on an opposite side to that opposing the optical element, which retro-reflects light entering from the optical element.