Optical element, light condensation backlight system, and liquid crystal display
First Claim
1. An optical element comprising:
- a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, anda linearly polarized light reflection polarizer (B) transmitting linearly polarized light with one polarization axis and selectively reflecting linearly polarized light with the other polarization axis perpendicular to the one polarization axis, whereinthe polarizing element (A) and the linearly polarized light reflection polarizer (B) are laminated in the optical element; and
the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more anda distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.2 or less, andwherein a reflection band width of the polarizing element (A) is 200 nm or more, anda twist pitch length of a cholestric liquid crystal in the polarizing element (A) varies along the thickness direction;
wherein the polarizing element (A) is capable of increasing a linearly polarized light component of emitting light as incidence angle increases, andwherein a polarization axis of the linearly polarized light of emitting light is substantially perpendicular or substantially parallel to the normal direction of a surface of the polarizing element.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical element comprising: a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, and a linearly polarized light reflection polarizer (B) transmitting linearly polarized light with one polarization axis and selectively reflecting linearly polarized light with the other polarization axis perpendicular to the one polarization axis, wherein the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more and a distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.2 or less, the polarizing element (A) has a function increasing a linearly polarized light component of emitting light as incidence angle is larger; is capable of condensation and collimation of incident light from a light source and capable of suppressing transmission of light in an arbitrary direction.
-
Citations
30 Claims
-
1. An optical element comprising:
-
a polarizing element (A), separating incident light into polarization to then emit light, and made of a cholesteric liquid crystal, and a linearly polarized light reflection polarizer (B) transmitting linearly polarized light with one polarization axis and selectively reflecting linearly polarized light with the other polarization axis perpendicular to the one polarization axis, wherein the polarizing element (A) and the linearly polarized light reflection polarizer (B) are laminated in the optical element; and the polarizing element (A) has a distortion rate with respect to emitting light to incident light in the normal direction of 0.5 or more and a distortion rate with respect to emitting light to incident light at an angle inclined from the normal direction by 60 degrees or more of 0.2 or less, and wherein a reflection band width of the polarizing element (A) is 200 nm or more, and a twist pitch length of a cholestric liquid crystal in the polarizing element (A) varies along the thickness direction; wherein the polarizing element (A) is capable of increasing a linearly polarized light component of emitting light as incidence angle increases, and wherein a polarization axis of the linearly polarized light of emitting light is substantially perpendicular or substantially parallel to the normal direction of a surface of the polarizing element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
-
Specification