Display device
View Patent ↗A display device of the present invention has light-emitting devices making up a plurality of pixels placed in a matrix form. In the display device of the present invention, the light-emitting devices each possesses an emissive layer and a reflective element placed on the rear surface of the emissive layer; the emissive layer possesses at the said of the front side, a polarization separator which separates the light emitted from the emissive layer into two kinds of polarized components by the reflection and the transmission, and phase plate; the emissive layer substantially maintains the sate of the polarization of the light transmitted there-through; the reflective element at least reflects the circularly polarized light impinging in the vertical direction mainly as a circularly polarized light having a reverse helicity direction; and the polarization separator has a reflectance of the wavelength range from 520 nm to 600 nm smaller than a reflectance of range not more than 540 nm.
1. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a polarization separator, which separates light into two kinds of polarized light components, is provided between said emissive layer and said phase plate,
said polarization separator has a reflectance of a wavelength range from 520 nm to 600 nm smaller than a reflectance of a wavelength range not more than 510 nm.
2. The light emitting device according to claim 1 , wherein said polarization separator has a central wavelength of a selective reflection between 420 nm and 480 nm.
3. The light emitting device according to claim 1 , wherein said polarization separator comprises a cholesteric liquid crystal layer, and said phase plate comprises a quarter wave plate, and said polarization separator, said phase plate, and a polarizer plate are provided from the side of said emissive layer in this order.
4. The light emitting device according to claim 1 , which is making up plurality if of pixels placed in a matrix form and working as a display device.
5. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a polarization separator, which separates light into two kinds of polarized light components, is provided between said emissive layer and said phase plate,
said polarization separator has a reflection of a light having a wavelength corresponding to blue higher than reflection of light having a wavelength other than blue.
6. The light emitting device according to claim 5 , which is making up plurality of pixels placed in a matrix form and working as a display device.
7. The light emitting device according to claim 5 , wherein said polarization separator has a central wavelength of a selective reflection between 420 nm and 480 nm.
8. The light emitting device according to claim 5 , wherein said polarization separator comprises a cholesteric liquid crystal layer, and said phase plate comprises a quarter wave plate, and said polarization separator, said phase plate, and a polarizer plate are provided from the side of said emissive layer in this order.
9. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a polarization separator, which separates light into two kinds of polarized light components, is provided between said emissive layer and said phase plate,
said polarization separator has a central wavelength of a selective reflection between 420 nm and 480 nm.
10. The light emitting device according to claim 9 , which is making up plurality of pixels placed in a matrix form and working as a display device.
11. The light emitting device according to claim 9 , wherein said polarization separator comprises a cholesteric liquid crystal layer, and said phase plate comprises a quarter wave plate, and said polarization separator, said phase plate, and a polarizer plate are provided from the side of said emissive layer in this order.
12. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a linear polarization separator, which reflects a linearly polarized light having a prescribed wavelength range, and transmits lights other than said linearly polarized light having a prescribed wavelength range, is provided between said phase plate and said polarizer,
said phase plate comprises a quarter wave plate,
and said linear polarization separator has a reflectance of a wavelength range from 520 nm to 600 nm smaller than a reflectance of a wavelength range not more than 510 nm.
13. The light emitting device according to claim 12 , which is making up a plurality of pixels placed in a matrix form and working as a display device.
14. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a linear polarization separator, which reflects a linearly polarized light having a prescribed wavelength range, and transmits lights other than said linearly polarized light having a prescribed wavelength range, is provided between said phase plate and said polarizer,
said phase plate comprises a quarter wave plate,
and said liner polarization separator has a reflection of a light having a wavelength corresponding to a blue higher than reflection of light having a wavelength other than blue.
15. The light emitting device according to claim 14 , which is making up a plurality of pixels placed in a matrix form and working as a display device.
16. A light emitting device comprising a reflective element, an emissive layer, a phase plate, and a polarizer in this order, wherein
a linear polarization separator, which reflects a linearly polarized light having a prescribed wavelength range, and transmits lights other than said linearly polarized light having a prescribed wavelength range, is provided between said phase plate and said polarizer,
said phase plate comprises a quarter wave plate,
and said linear polarization separator has a central wavelength of a reflection between 420 nm and 480 nm.
17. The light emitting device according to claim 16 , which is making up a plurality of pixels in a matrix form and working as a display device.