Retardation element and display
View Patent ↗A retardation element allowing a reduction in ghosts caused by optical anisotropy of a base film, and a display including the retardation element are provided. A retardation element includes: a base film having optical anisotropy; and a retardation layer formed on the base film and having optical anisotropy, in which the retardation layer includes retardation regions of two or more kinds of which slow axes are oriented in different directions from one another, the retardation regions of two or more kinds are arranged regularly adjacent to one another in an in-plane direction of the base film, and each of the retardation regions has a slow axis in a direction intersecting with a slow axis of the base film at an angle larger than 45°.
1. A retardation element comprising:
a base film having optical anisotropy and a slow axis in an in-plane direction of the base film; and
a retardation layer formed on the base film and having optical anisotropy,
wherein the retardation layer includes retardation regions of two or more kinds of which slow axes are in the in-plane direction of the base film and oriented in different directions from one another,
wherein the retardation regions of two or more kinds are arranged regularly adjacent to one another in the in-plane direction of the base film, and
wherein each of the retardation regions has a slow axis in a direction intersecting with the slow axis of the base film at an angle larger than 45° and equal to or smaller than 52°.
2. The retardation element according to claim 1 , wherein
the slow axis of each of the retardation regions is oriented in a direction intersecting with the slow axis of the base film at an angle corresponding to the magnitude of retardation of the base film.
3. The retardation element according to claim 1 , wherein the retardation regions of two or more kinds comprises a right-eye region and a left-eye region, and wherein the slow axis of each of the retardation regions is oriented in a direction intersecting with the slow axis of the base film at an angle corresponding to one or both of peak values of extinction ratios represented by the following two formulas:
Extinction
Ratio
of
Right
-
EyeRegion
=
Luminance
When
Right
-
EyeRegion
is
V
iewed
With
Right
-
EyeLens
Luminance
When
Right
-
EyeRegion
is
Viewed
With
Left
-
EyeLens
Mathematical
Formula
1
Extinction
Ratio
of
Left
-
EyeRegion
=
Luminance
When
Left
-
EyeRegion
is
Viewed
With
Left
-
EyeLens
Luminance
When
Left
-
EyeRegion
is
Viewed
With
Right
-
EyeLens
Mathematical
Formula
2
wherein the luminance in each ratio is calculated when a pair of polarized glasses comprising a right-eye lens and a left-eye lens are used.
4. The retardation element according to claim 1 , wherein
the base film is configured of a resin film.
5. The retardation element according to claim 1 , wherein
the base film has a slow axis in a direction parallel to or orthogonal to a boundary line of adjacent retardation regions.
6. The retardation element according to claim 1 , wherein
the retardation regions of one kind each have a retardation of +λ/4, and
the retardation regions of other kinds each have a retardation of −λ/4.
7. The retardation element according to claim 1 , wherein
the retardation layer includes the retardation regions of two kinds,
each of the retardation regions has a slow axis in such a direction that a bisector of the slow axes of the retardation region of one kind and the retardation region of the other kind are parallel to the slow axis of the base film.
8. A display comprising:
a display panel being driven in response to an image signal;
a backlight unit applying light to the display panel; and
a retardation element arranged on a side opposite to a side where the backlight unit is arranged of the display panel,
wherein the retardation element includes:
a base film having optical anisotropy and a slow axis in an in-plane direction of the base film, and
a retardation layer formed on the base film and having optical anisotropy,
wherein the retardation layer includes retardation regions of two or more kinds of which slow axes are in the in-plane direction of the base film and oriented in different directions from one another,
wherein the retardation regions of two or more kinds are arranged regularly adjacent to one another in the in-plane direction of the base film, and
wherein each of the retardation regions has a slow axis in a direction intersecting with the slow axis of the base film at an angle larger than 45° and equal to or smaller than 52°.
9. A retardation element comprising:
a base film having optical anisotropy; and
a retardation layer formed on the base film and having optical anisotropy,
wherein the retardation layer includes retardation regions of two or more kinds of which slow axes are oriented in different directions from one another,
the retardation regions of two or more kinds are arranged regularly adjacent to one another in an in-plane direction of the base film, and
each of the retardation regions has a slow axis in a direction intersecting with a slow axis of the base film at an angle of larger than 45° and equal to or smaller than 52°.
10. A display comprising:
a display panel being driven in response to an image signal;
a backlight unit applying light to the display panel; and
a retardation element arranged on a side opposite to a side where the backlight unit is arranged of the display panel,
wherein the retardation element includes:
a base film having optical anisotropy, and
a retardation layer formed on the base film and having optical anisotropy, and
the retardation layer includes retardation regions of two or more kinds of which slow axes are oriented in different directions from one another,
the retardation regions of two or more kinds are arranged regularly adjacent to one another in an in-plane direction of the base film, and
each of the retardation regions has a slow axis in a direction intersecting with a slow axis of the base film at an angle of larger than 45° and equal to or smaller than 52°.