Liquid crystal display device and polarizing plate used in the same
A polarizing plate and polarizing film technology, which is applied in the field of liquid crystal display devices, can solve problems such as uneven color, and achieve the effects of excellent cost performance or productivity, thinning, and excellent visibility
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Embodiment 1
[0252] (a) Production of polarizing film
[0253] After immersing a polyvinyl alcohol film with an average degree of polymerization of about 2400, a degree of saponification of 99.9 mol% or more, and a thickness of 75 μm in pure water at 30°C, the film is immersed at 30°C in an iodine / potassium iodide / water weight ratio of 0.02 / 2 / 100 in aqueous solution. Thereafter, it was immersed in an aqueous solution having a weight ratio of potassium iodide / boric acid / water of 12 / 5 / 100 at 56.5°C. Subsequently, it was washed with pure water at 8° C., and then dried at 65° C. to obtain a polarizing film in which iodine was adsorbed and oriented in polyvinyl alcohol. Stretching is mainly carried out in the process of iodine dyeing and boric acid treatment, and the maximum stretching ratio is 5.3 times.
[0254] (b) Fabrication of polarizing plate with adhesive
[0255] On one side of the polarizing film obtained in the above (a), corona treatment was performed on the bonding surface, and...
Embodiment 2
[0260] Use Nz factor of 4, R 0 A stretched polyethylene terephthalate film of 1500 nm is glued so that the angle of deviation between the transmission axis of the polarizing film and the lag phase axis of the stretched polyethylene terephthalate film is 40 degrees In addition, it carried out similarly to Example 1 (b) except this, and produced the polarizing plate. Furthermore, except having used this polarizing plate as a back side polarizing plate, it carried out similarly to Example 1 (c), and produced the liquid crystal display device. The obtained liquid crystal display device was visually observed, and the oblique color unevenness (interference unevenness) was small and the visibility was good.
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