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Polarizing plate and liquid crystal display

A polarizer and polarizer technology, applied in the field of polarizers and liquid crystal displays, can solve the problem of not considering the uniformity of in-plane retardation value, and achieve the effect of uniform display quality

Active Publication Date: 2009-12-23
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] JP-A-2002-333523 previously described the in-plane retardation of polarizers and proposed a method for preparing polarizers with sufficient optical properties, but did not take into account the uniformity of in-plane retardation values

Method used

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  • Polarizing plate and liquid crystal display
  • Polarizing plate and liquid crystal display
  • Polarizing plate and liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0069] A polarizing plate was prepared as follows. A preferred production method of the polarizer includes the steps of swelling, dyeing, hardening, stretching, drying, lamination with a protective film and drying after lamination. The order of the dyeing, hardening and stretching steps can be changed as desired. Two or more steps can be performed simultaneously. As taught in Japanese Patent No. 3331615, the hardening step is performed by washing with water.

[0070] The process is preferably carried out in the following order: swelling, dyeing, hardening / stretching, drying, lamination with protective film and drying after lamination. During or after these steps, a step of on-line detection of the surface condition may be provided.

[0071] The swelling step is preferably performed with water only. Aqueous boric acid solution can be used to swell PVA film to a controlled extent to obtain stabilized optical properties and prevent film shrinkage. The swelling temperature an...

Embodiment 1

[0534] 1. Preparation of Polarizer 1

[0535] A 75 μm thick PVA film with a degree of polymerization of 2400 was swelled in water at 30° C. for 40 seconds. The swollen PVA film was immersed in an aqueous solution containing 0.06% iodine and 6% potassium iodide at 30°C for 60 seconds, and then immersed in an aqueous solution containing 4% boric acid and 3% potassium iodide at 40°C for 60 seconds. While soaking the PVA film, stretch it longitudinally by 5.2 times. The moisture content of the PVA film immediately before stretching was 52%. Then, the longitudinally stretched PVA film was stretched 1.1 times in the transverse direction with a tenter. As a result, the final length is 5 times the original length. The stretched film was dried at 50° C. for 4 minutes to obtain a polarizer (named Polarizer 1).

[0536] Film 1 (a cellulose acylate film prepared in advance) and a commercially available triacetyl cellulose film (TAC TD80U from Fuji Photo Film) were respectively dissolv...

Embodiment 2

[0559] The polarizers on the viewing side and the backlight side of a VA mode LCD-television (LC-30AD1, manufactured by Sharp Corp.) were peeled off, and instead, the polarizers prepared in Example 1 and no viewing angle were provided according to the combinations in Table 4. A commercially available polarizing plate (HLC2-5618 from Sanritzu Corp.) was compensated for the film. The polarizer on the viewing side was installed with its absorption axis parallel to the horizontal direction of the LCD panel, and the polarizer on the backlight side was installed with its absorption axis coincident with the vertical direction of the panel. The polarizers were bonded with their adhesive side facing the liquid crystal cell.

[0560] After the releasable protective sheet was peeled off, the viewing angle of the LCD-television displayed in 8 levels from black (L1) to white (L8) was measured with a contrast meter (EZContrast 160D, manufactured by ELDIM) (with a contrast ratio of 10 or mor...

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Abstract

A polarizing plate comprising a polarizer containing polyvinyl alcohol and a protective film on at least one side of the polarizer, the in-plane phase difference Rpva of the polarizer in any region measured as 39 cm wide and 65 cm long The difference between the maximum value and the minimum value is 5.0% or less.

Description

technical field [0001] The present invention relates to a polarizing plate having a polarizer having a substantially uniform in-plane phase difference and a liquid crystal display (hereinafter, LCD) free from stripe-like unevenness of density by using the polarizing plate. Background technique [0002] In view of its various advantages such as low voltage, low power consumption, and in view of reduction in size and thickness, LCDs are widely used as monitors for personal computers, mobile devices, and televisions. Various modes of LCDs have been proposed based on the alignment of liquid crystal molecules in a liquid crystal cell. Twisted nematic (TN) mode, in which the orientation direction of liquid crystal molecules is twisted by about 90° from one side of the cell to the other, has become mainstream. [0003] LCDs generally consist of liquid crystal elements, optical compensation films, and polarizers. Optical compensation films for removing image decolorization or wide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F1/133528G02F1/133634G02B5/3025B29C55/12
Inventor 大轻郁子佐多博晓
Owner FUJIFILM CORP
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