Optical compensating resin film for polarizing plate, method for manufacturing optical compensating resin film, polarizing plate and liquid crystal display device

The present invention relates to an optical compensating resin film for polarizing plates, an polarizing plate, and a liquid crystal display device, and in more detail to an optical compensating resin film for polarizing plates, which minimizes light leakage due to light scattering to improve image contrast and a polarizing plate employing the aforesaid optical compensating resin film, which exhibits high contrast and excellent smoothness without color non-uniformity, and a liquid crystal display device.

In recent years, thin and lightweight notebook computers as well as large screen TVs have increasingly been developed. Along with the above, a decrease in thickness, an increase in size, and higher performance have increasingly been sought for polarizing plate protective films employed in display devices such as a liquid crystal display device. Of these, heretofore, liquid crystal display devices have had a problem of narrow view angle. In order to increase the view angle of liquid crystal display devices, a method is proposed in which an optical compensating resin film is employed (refer, for example, to Patent Document-1).

Further, employed in current polarizing plates is a cellulose ester film as a protective film, which has a problem in which its retardation value reversibly varies depending on humidity. Consequently, it is proposed that the above variation is reduced by changing plasticizers and regulating film thickness (refer, for example, to Patent Document 2).

Further, display changes due to the view angle, especially color changes, have caused problems, whereby improvements have been proposed in which rodlike compounds are newly introduced (refer, for example, to Patent Documents 3 and 4).

By employing the above means, it is possible to reduce display changes and color variation, however its level of contrast has still been insufficient. Consequently, technical means to overcome this drawback have been sought.

• Patent Document 1: Japanese Patent Publication Open to Public Inspection (hereinafter referred to as JP-A) No. 6-222213
• Patent Document 2: Japanese Patent Application No. 2005-161095
• Patent Document 3: JP-A No. 2002-267847
• Patent Document 4: JP-A No. 2004-4550

Accordingly, an object of the present invention is to provide an optical compensating resin film for polarizing plates, in which the displayed image contrast is improved, a polarizing plate employing the above optical compensating resin film, which exhibits excellent smoothness without color non-uniformity, and a liquid crystal display device.

The above object of the present invention was achieved via the following embodiments.

1. An optical compensating resin film for a polarizing plate, wherein Ro, defined by the following formula, is 20-300 nm at 23° C. and 55% relative humidity, or Rt, defined by the following formula, is 70-400 nm at 23° C. and 55 relative humidity, and a crystallinity degree of the aforesaid resin film is 0.15 or less:

Ro=(nx−ny)×d

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Polarizing plate and liquid crystal display device equipped with the same
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