Optical device, polarizing plate, diffuser, diffusing film, polarizing film and liquid crystal image display apparatus
First Claim
1. An optical device for a liquid crystal display apparatus that displays an image, the optical device being arranged at a front side of the liquid crystal display apparatus, comprising:
- a plastic-based film; and
a diffusing layer formed at least one surface of the plastic-based film and scatters light that passes through the diffusing layer, the diffusing layer including;
a medium; and
inner scattering elements that selectively Mie-scatter visible light having a wavelength range of 400 nm to 500 nm into the medium, the inner scattering elements having a refraction index different from a refraction index of the medium, wherein the diffusing layer has pencil hardness of equal to or more than 2H under a 500 g-load specified in ISO/DIS 15184, andwherein, when the optical device is arranged at the front side of the liquid crystal display apparatus that displays color near eight test colors specified in CIE 1974, as a test color, the optical device being formed so that chrominance Δ
u′
v′
obtained according to the following Equation 1 is equal to or less than 0.05, based on a chromaticity coordinate (u0′
, v0′
) of CIE1976UCS observed in the front side and a chromaticity coordinate (u′
, v′
) of CIE1976UCS observed at an observation angle of ±
60 degrees in horizontal and vertical directions of a screen of the liquid crystal display apparatus when a direction perpendicular to the screen is assumed to be 0 degrees
Δ
u′
v′
={(u′
−
u0′
)2+(v′
−
v0′
)2}0.5
[Equation 1].
1 Assignment
0 Petitions
Accused Products
Abstract
An optical device includes a plastic-based film and a diffusing layer. The diffusing layer includes inner scattering elements that selectively scatter visible light having a wavelength range, and has pencil hardness of more than 2H under a 500 g-load specified in ISO/DIS 15184. When the optical device is arranged at a front side of a liquid crystal display apparatus that displays color near 8 test colors specified in CIE 1974, as a test color, chrominance Δu′v′ of less than 0.05 is obtained based on a chromaticity coordinate (u0′, v0′) of CIE1976UCS observed in the front surface 100A1 of the liquid crystal display apparatus and a chromaticity coordinate (u′, v′) observed at an observation angle of ±60 degrees in horizontal and vertical directions of a screen of the liquid crystal display apparatus when a direction perpendicular to the screen is assumed to be 0 degrees.
-
Citations
20 Claims
-
1. An optical device for a liquid crystal display apparatus that displays an image, the optical device being arranged at a front side of the liquid crystal display apparatus, comprising:
-
a plastic-based film; and a diffusing layer formed at least one surface of the plastic-based film and scatters light that passes through the diffusing layer, the diffusing layer including; a medium; and
inner scattering elements that selectively Mie-scatter visible light having a wavelength range of 400 nm to 500 nm into the medium, the inner scattering elements having a refraction index different from a refraction index of the medium, wherein the diffusing layer has pencil hardness of equal to or more than 2H under a 500 g-load specified in ISO/DIS 15184, andwherein, when the optical device is arranged at the front side of the liquid crystal display apparatus that displays color near eight test colors specified in CIE 1974, as a test color, the optical device being formed so that chrominance Δ
u′
v′
obtained according to the following Equation 1 is equal to or less than 0.05, based on a chromaticity coordinate (u0′
, v0′
) of CIE1976UCS observed in the front side and a chromaticity coordinate (u′
, v′
) of CIE1976UCS observed at an observation angle of ±
60 degrees in horizontal and vertical directions of a screen of the liquid crystal display apparatus when a direction perpendicular to the screen is assumed to be 0 degrees
Δ
u′
v′
={(u′
−
u0′
)2+(v′
−
v0′
)2}0.5
[Equation 1]. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. A liquid crystal image display apparatus comprising:
-
a diffuser; an analyzer; a first biaxial phase difference optical device; a vertical alignment liquid crystal cell; a second biaxial phase difference optical device; a polarizer; and a backlight, which are arranged in order from a front side to a rear side, wherein the diffuser includes inner scattering elements that cause Mie scattering; the analyzer and the polarizer are arranged in cross-Nicol condition; slow axes of the first and second biaxial phase difference optical devices are arranged to be perpendicular to an absorption axis of the analyzer or the polarizer; the first and second biaxial phase difference optical devices compensate a phase difference of the liquid crystal cell; and the diffuser suppresses color shift in halftone. - View Dependent Claims (14, 15, 16)
-
-
17. A diffuser for use in a liquid crystal image display apparatus having a vertical-aligned liquid crystal cell, the diffuser being arranged at a front side at which an image of the liquid crystal panel is displayed, the diffuser suppressing color variation of the image which occurs when an observation angle at the front side is changed, wherein
the diffuser has a diffusion characteristic of diffusing equal to or more than 10% of parallel light ray incident in a front direction perpendicular to the front side with an angle range of 35° - to 55°
with respect to the front direction and diffusing equal to or less than 7% of the parallel light ray with an angle range of 60°
to 90°
with respect to the front direction. - View Dependent Claims (18, 19, 20)
- to 55°
Specification