Polarizer, polarizing light source device and liquid crystal display
AssigneeSumitomo Chemical Company, Limited
InventorsMasaru Honda, Koji Higashi
Life of this patent
Estimating the term…
Abstract
A polarizer is provided which comprises a reflection type polarizer and a dichroic polarizer, each of which is placed so that polarizing transmission axes of the reflection type polarizer and the dichroic polarizer are coincident with each other on the same optical path, wherein the dichroic polarizer has a transmittance [T(AP)(λ)] of about 44% or more and a polarizing coefficient [P(AP)(λ)] of about 50.0% or more or wherein the dichroic polarizer has a luminous correction transmittance [Y(AP)] of about 44% or more and a luminous correction polarizing coefficient [P(AP, y)] of about 50.0% or more.
Claims17
A polarizer comprising a reflection type polarizer and a dichroic polarizer, each of which is placed so that polarizing transmission axes of said reflection type polarizer and said dichroic polarizer are coincident with each other on the same optical path, wherein the dichroic polarizer has a transmittance [T(AP)(λ)] of about 44% or more and a polarizing coefficient [P(AP)(λ)] of about 97% or more, and the polarizer has a luminous correction polarizing coefficient [P(P,Y)] of 99.9% or more.
A polarizer comprising a reflection type polarizer and a dichroic polarizer, each of which is placed so that polarizing transmission axes of said reflection type polarizer and said dichroic polarizer are coincident with each other on the same optical path, wherein the dichroic polarizer has a luminous correction transmittance [Y(AP)] of about 44% or more and a luminous correction polarizing coefficient [P(AP,y)] of about 95% or more, and the polarizer has a luminous correction polarizing coefficient [P(P,Y)] of 99.9% or more.
A polarizing light source device comprising, in the following order,
- (I) the polarizer comprising a reflection type polarizer and a dichroic polarizer, each of which is placed so that polarizing transmission axes of said reflection type polarizer and said dichroic polarizer are coincident with each other on the same optical path, wherein said dichroic polarizer has
- i) a transmittance [T(AP)(λ)] of about 44% or more and a polarizing coefficient [P(AP)(λ)] of about 97% or more, or
- ii) a luminous correction transmittance [Y(AP)] of about 44% or more and a luminous correction polarizing coefficient [P(AP, y)] of about 95% or more,
- (II) a light source and
- (III) a reflector,
- wherein the light source (II) and the reflector (III) are placed over the side of a surface of the reflection type polarizer in the polarizer (I).
A polarizing light source device comprising, in the following order,
- (I) the polarizer comprising a reflection type polarizer and a dichroic polarizer, each of which is placed so that polarizing transmission axes of said reflection type polarizer and said dichroic polarizer are coincident with each other on the same optical path, wherein said dichroic polarizer has
- i) a transmittance [T(AP)(λ)] of about 44% or more and a polarizing coefficient [P(AP)(λ)] of about 97% or more, or
- ii) a luminous correction transmittance [Y(AP)] of about 44% or more and a luminous correction polarizing coefficient [P(AP, y)] of about 95% or more,
- (II) a light transmitting plate having a light source provided on its end and
- (III) a reflector,
- wherein the light transmitting plate (II) and the reflector (III) are placed over the side of a surface of the reflection type polarizer in the polarizer (I).
Dependencies are inferred from the claim text.