Method for manufacturing polarization plate and liquid crystal display device having the polarization plate

• Main Authors: TSUCHIMOTO KAZUKI, SUGINO YOUICHIROU, HAMAMOTO EIJI, KONDOU SENRI, KUSUMOTO SEIICHI
• Format: Patent
• Language: English; Korean
• Published: 03.04.2003
• Edition: 7
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE: A manufacturing method of a polarizing plate and a liquid crystal display apparatus employing the polarizing plate are provided to improve transmissivity and polarization of the liquid crystal display by increasing the elongation rate of a second bath higher than a first bath. CONSTITUTION: A polyvinyl alcohol film is dyed with the dyeing solution including bicolor iodine, and cross-linked with the cross-linking agent. A polarizing plate is manufactured by elongating the polyvinyl alcohol film with a couple of rolls. Two or more baths containing the cross-linking agent are installed. The elongation rate of the first bath is to be one to four times, and the elongation rate of the second bath is to be more than the elongation rate of the first bath. Following the second bath, the temperature of the bath is 5 deg.C higher than the temperature of the first bath, and the temperature of the first bath is within the range of 10-90 deg.C. 고투과율이고 고편광도의 특성을 가지는 편광판과, 이 방법에 의해 얻어진 편광판을 구비한 액정표시장치를 제공한다. 폴리비닐알콜(PVA) 필름을 2색성의 성질을 가지는 요오드를 포함하는 염색액으로 염색하여, 가교제로 가교하는 동시에, 상기 공정에서 적어도 한 쌍의 롤을 이용하여 연신하여 편광판을 제조하는 방법에서, 상기 가교제를 넣은 배스를 2배스 이상 설치하고, 그 1배스째의 연신 배율이 1배 이상 4배 이하, 2배스째 이후의 연신 배율이 상기 1배스째의 연신 배율보다도 높은 연신율로 연신한다.