Production method of polarizing plate

A method for producing a polarizing plate, comprising:

• steaming a polyester polymer film by exposing the polymer film to steam while a temperature of the steam is in a range of 50° C. to 150° C. for 10 seconds to 1 hour,
• water-treating the polymer film by immersing the polymer film in water having a temperature in a range of 10° C. to 30° C. for 5 to 1000 seconds,
• heat-treating the polymer film,
• wherein the polymer film before the heat treatment has a shrinkage force in a first direction in a range of 5.5N to 15N, wherein the polymer film after the heat treatment has a shrinkage force in the first direction in a range of 5N to 10N,
• a ratio (S1/S2) of the shrinkage force (S1) of the polymer film after the heat treatment in the first direction to a shrinkage force (S2) in a second direction perpendicular to the first direction is 13 or more;
• the heat treatment is performed at a temperature satisfying Equation 2 below:
• (Tg−60)° C.≤T≤(Tg+50)° C. [Equation 2]
• the Tg is a glass transition temperature of the polymer film, the T is the heat treatment temperature and the unit of the glass transition temperature and the heat treatment temperature is ° C.;
• attaching the heat-treated polymer film to a polarizing film having a light absorption axis formed in one direction, wherein the polymer film and the polarizing film are attached such that the first direction forms an angle in a range of 80 degrees to 100 degrees with the light absorption axis of the polarizing film, wherein a ratio (SPro/SPVA) of a shrinkage force (SPVA) of the polarizing film in a direction parallel to the light absorption axis direction and the shrinkage force (SPro) of the polymer film in the first direction is in a range of 0.1 to 5.5;
• and
• forming a pressure-sensitive adhesive layer on, a surface of a side opposite to a surface of the polarizing film on which the polymer film is attached and wherein thicknesses of the polarizing film, the polymer film and the, pressure-sensitive adhesive layer are adjusted so as to satisfy Equation 1 below:
• 0.01 to 26 N·mm=a×(SPVA×(T1+b)+SPro×(T2+b)) [Equation 1]
• wherein, the T1 is a distance (unit:
• mm) from the lowermost portion of the pressure-sensitive adhesive layer to the center of the polarizing film, the T2 is a distance (unit:
• mm) from the lowermost portion of the pressure-sensitive adhesive layer to the center of the polymer film, the a is a number within a range of 0.5 to 2, and the b is a number within a range of 0.14 to 0.6.