Display device
View Patent ↗A display device includes: a display panel, a reflective polarization plate, a polarization control panel, a polarization plate, and an optical layer arranged in a stated order. The reflective polarization plate transmits a component polarized in the first direction and reflects a component polarized in the second direction, in light incident on the reflective polarization plate. The polarization control panel is switchable between a first state in which light incident on the polarization control panel has its polarization direction changed and is transmitted accordingly and a second state in which the incident light has its polarization direction maintained and is transmitted accordingly. The polarization plate transmits a component polarized in the first direction or a component polarized in the second direction, in light incident on the polarization plate. The optical layer disturbs a polarization direction of light incident on the optical layer and transmits the light accordingly.
1. A display device comprising:
a display panel, a reflective polarization plate, a polarization control panel, a polarization plate, and an optical layer arranged in a stated order along a third direction, which is one of a first direction, a second direction, and the third direction that intersect each other, wherein
the reflective polarization plate transmits a component polarized in the first direction and reflects a component polarized in the second direction, in light incident on the reflective polarization plate,
the polarization control panel is switchable between a first state in which light incident on the polarization control panel has its polarization direction changed and is transmitted accordingly and a second state in which the incident light has its polarization direction maintained and is transmitted accordingly,
the polarization plate transmits a component polarized in the first direction or a component polarized in the second direction, in light incident on the polarization plate, and
the optical layer includes polarizing and scattering particles that disturb a polarization direction of light incident on the optical layer and transmits the light accordingly.
2. The display device according to claim 1 , wherein
a haze value of the optical layer is equal to or smaller than 10%, and
a depolarization factor of the optical layer is equal to or larger than 0.02.
3. The display device according to claim 2 , wherein
the reflective polarization plate includes a first wave plate, a circular polarization reflection layer, and a second wave plate arranged in a stated order along the third direction when viewed from the side of the display panel,
the first wave plate transforms a component of light incident on the first wave plate polarized in the first direction into a component circularly polarized in a first rotational direction and transmits resultant light,
the circular polarization reflection layer transmits a component circularly polarized in the first rotational direction and reflects a component circularly polarized in a second rotational direction opposite to the first rotational direction, in light incident on the circular polarization reflection layer, and
the second wave plate transforms a component of light incident on the second wave plate circularly polarized in the first rotational direction into a component polarized in the first direction and transmits the resultant light.
4. The display device according to claim 1 , wherein
the display device is adapted to be mounted in a vehicle, and
a direction of an absorption axis of the polarization plate is aligned with a horizontal direction of the vehicle.
5. The display device according to claim 1 , wherein
the reflective polarization plate includes a first wave plate, a circular polarization reflection layer, and a second wave plate arranged in a stated order along the third direction when viewed from the side of the display panel,
the first wave plate transforms a component of light incident on the first wave plate polarized in the first direction into a component circularly polarized in a first rotational direction and transmits resultant light,
the circular polarization reflection layer transmits a component circularly polarized in the first rotational direction and reflects a component circularly polarized in a second rotational direction opposite to the first rotational direction, in light incident on the circular polarization reflection layer, and
the second wave plate transforms a component of light incident on the second wave plate circularly polarized in the first rotational direction into a component polarized in the first direction and transmits the resultant light.
6. The display device according to claim 1 , further comprising a transparent bonding layer that bonds the reflective polarization plate and the display panel.
7. The display device according to claim 1 , wherein
the display panel includes a liquid crystal layer, and
a linear polarization plate is not disposed between the reflective polarization plate and the liquid crystal layer.
8. A display device comprising:
a display panel, a reflective polarization plate, a polarization control panel, a polarization plate, and an optical layer arranged in a stated order along a third direction, which is one of a first direction, a second direction, and the third direction that intersect each other, wherein
the reflective polarization plate transmits a component polarized in the first direction and reflects a component polarized in the second direction, in light incident on the reflective polarization plate,
the polarization control panel is switchable between a first state in which light incident on the polarization control panel has its polarization direction changed and is transmitted accordingly and a second state in which the incident light has its polarization direction maintained and is transmitted accordingly,
the polarization plate transmits a component polarized in the first direction or a component polarized in the second direction, in light incident on the polarization plate, and
the optical layer disturbs a polarization direction of light incident on the optical layer and transmits the light accordingly,
the reflective polarization plate includes a first wave plate, a circular polarization reflection layer, and a second wave plate arranged in a stated order along the third direction when viewed from the side of the display panel,
the first wave plate transforms a component of light incident on the first wave plate polarized in the first direction into a component circularly polarized in a first rotational direction and transmits resultant light,
the circular polarization reflection layer transmits a component circularly polarized in the first rotational direction and reflects a component circularly polarized in a second rotational direction opposite to the first rotational direction, in light incident on the circular polarization reflection layer, and
the second wave plate transforms a component of light incident on the second wave plate circularly polarized in the first rotational direction into a component polarized in the first direction and transmits the resultant light.
9. The display device according to claim 8 , wherein
the optical layer includes an optical film having retardation of 3000 nm-15000 nm.
10. The display device according to claim 9 , wherein
the optical film is a stretched film, and
an angle formed by an absorption axis of the polarization plate and a direction of stretch of the optical film is about 45°.
11. The display device according to claim 8 , wherein
the optical layer includes a retardation film that is a stretched film, and
an angle formed by an absorption axis of the polarization plate and a direction of stretch of the retardation film is about 45°.
12. The display device according to claim 8 , further comprising a transparent bonding layer that bonds the reflective polarization plate and the display panel.
13. The display device according to claim 8 , wherein
the display panel includes a liquid crystal layer, and
a linear polarization plate is not disposed between the reflective polarization plate and the liquid crystal layer.
14. The display device according to claim 8 , wherein
the display device is adapted to be mounted in a vehicle, and
a direction of an absorption axis of the polarization plate is aligned with a horizontal direction of the vehicle.