| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source device for polarized light which uses a dichroic polarizing element and a reflection type polarizing element, and to effectively use light in a liquid crystal display device which uses the light source device for polarized light. SOLUTION: A reflection type polarizing element 52 and a dichroic polarizing element 51 are arranged with the transmission axes for polarized light coincident with each other on an optical path to constitute a composite type polarizing device 80. The dichroic polarizing element 51 show >=44% transmittance T(P)(λ) and >=50% polarization degree P(P)(λ) at the wavelength λbetween 400 nm and 700 nm or shows >=44% luminosity-corrected transmittance Y(P) and >=50% luminosity-corrected polarization degree P(P, y). The light source device 40 for polarized light is composed of the polarizing device 80, a light source member 60 disposed in the reflection polarizing element 51b side of the device 80, and a reflection plate 63 disposed in the opposite side of the light source member 60 to the polarizing device 80. Further, the light source device 40 for polarized light is disposed on the back face of a liquid crystal cell 20 to constitute the liquid crystal display device 10. |
