| US 7,548,289 B2 | ||
| LCD device with film member attached to polarizing element and satisfies a predetermined contast ratio to be equal or greater than 0.025 for all azimuth angels | ||
| Akira Sakai, Kyoto (Japan); Masahiro Hasegawa, Nara (Japan); Tokihiko Shinomiya, Nara (Japan); and Yuichiro Yamada, Mie (Japan) | ||
| Assigned to Future Vision Inc., Tokyo (Japan) | ||
| Filed on Jan. 18, 2006, as Appl. No. 11/333,648. | ||
| Claims priority of application No. 2005-012031 (JP), filed on Jan. 19, 2005. | ||
| Prior Publication US 2006/0158593 A1, Jul. 20, 2006 | ||
| Int. Cl. G02F 1/1335 (2006.01) | ||
| U.S. Cl. 349—96 [349/122] | 28 Claims |
| 1. A liquid crystal display device comprising:
a liquid crystal display cell including liquid crystal between two substrates facing to each other;
a polarizing element provided on each side of the liquid crystal display cell; and
at least one film member provided in at least either one area of areas between the liquid crystal display cell and the polarizing
element,
the polarizing element being formed from a film made of polyvinylalcohol resin in which iodine or dichromatic dye is absorbed
and oriented,
the film member being attached to the polarizing element with a cohesive layer and/or an adhesive layer having a thickness
of less than 10 μm therebetween, and when attached to another film member, the film member being attached to the another film
member with a cohesive layer and/or an adhesive layer having a thickness of less than 10 μm therebetween,
the film member provided in at least either one area of areas between the liquid crystal display cell and the polarizing element
having an absolute value of a photoelastic coefficient of less than 10×10−8 cm2/N and having a water absorption of less than 2.0%; and
wherein the liuid crystal display device satisfies a relationship of CR (Φ, 60)/CR (0)≧0.025 at all azimuthal angles of Φ=0
to 360° when a contrast ratio of the liquid crystal display cell in a normal direction of the substrate on the observation
side as defined as CR (0), a contrast ratio of the liquid crystal display cell in a direction inclined by 60° from the normal
direction in an azimuthal angle Φ direction is defined as CR (Φ, 60).
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