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Vertically aligned liquid crystal display using polynorbornene based polymer film

A liquid crystal display, vertical alignment technology, applied in the direction of instruments, nonlinear optics, optics, etc., can solve the problems of light leakage, incomplete viewing angle compensation of VA-LCDs, etc., and achieve good durability, low moisture absorption rate, and good adhesive strength Effect

Active Publication Date: 2006-04-26
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, VA-LCDs that only include negative C-plate compensation films suffer from light leakage at oblique corners due to incomplete viewing angle compensation.

Method used

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  • Vertically aligned liquid crystal display using polynorbornene based polymer film
  • Vertically aligned liquid crystal display using polynorbornene based polymer film
  • Vertically aligned liquid crystal display using polynorbornene based polymer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0198] Such as image 3 structure, a vertical alignment type liquid crystal display (VA-LCD) including a polynorbornene-based polymer film serving as both a protective film of an upper polarizing plate and a negative C plate was fabricated. exist image 3 Among them, the reference symbol a is the absorption axis of the polarizing plate, and the reference symbol b is the slow axis of the A plate.

[0199] The VA panel includes a VA cell with a 3 μm gap and a pretilt of 89 degrees, filled with a liquid crystal having a negative dielectric anisotropy of Δε=−4.9 and a birefringence of Δn=0.099. Thickness retardation value of VA panel (R VA (550nm)) is 297nm.

[0200] The lower polarizing plate consists from bottom to top: an outer protective film made of TAC polymer, a polarizing film formed by dyeing a polyvinyl alcohol (PVA) film with iodine followed by stretching, an inner protective film made of TAC polymer , and A-plate membrane made of polycarbonate. At this time, the t...

Embodiment 2

[0204] Such as Figure 4 A structure of a vertical alignment type liquid crystal display (VA-LCD) including a polynorbornene-based polymer film serving as a protective film of a lower polarizing plate and a negative C plate was fabricated. exist Figure 4 Among them, the reference symbol a is the absorption axis of the polarizing plate, and the reference symbol b is the slow axis of the A plate.

[0205] The VA panel includes a VA cell with a 3 μm gap and a pretilt of 89 degrees and filled with a liquid crystal having a negative dielectric anisotropy of Δε=−4.9 and a birefringence of Δn=0.099. Thickness retardation value of VA panel (R VA (550nm)) is 297nm.

[0206] The lower polarizing plate consists from bottom to top: an outer protective film made of TAC polymer, a polarizing film formed by dyeing a PVA film with iodine and then stretching, polynorbornene used as an inner protective film and a negative C plate film Base polymer film, and A-plate film made of polycarbona...

Embodiment 3

[0210] Such as Figure 5 A vertical alignment type liquid crystal display (VA-LCD) including a polynorbornene-based polymer film serving as an inner protective film of an upper polarizing plate and a lower polarizing plate and a negative C plate was fabricated. exist Figure 5 Among them, the reference symbol a is the absorption axis of the polarizing plate, and the reference symbol b is the slow axis of the A plate.

[0211] The VA panel includes a VA cell with a 3 μm gap and a pretilt of 89 degrees and filled with a liquid crystal having a negative dielectric anisotropy of Δε=−4.9 and a birefringence of Δn=0.099. Thickness retardation value of VA panel (R VA (550nm)) is 297nm.

[0212] The lower polarizing plate consists from bottom to top: an outer protective film made of TAC polymer, a polarizing film formed by dyeing a polyvinyl alcohol (PVA) film with iodine and then stretched, used as an inner protective film, and a negative C plate The polynorbornene-based polymer ...

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Abstract

The present invention provides a vertical alignment liquid crystal display (VA-LCD) with good viewing angle characteristics, which contains liquid crystals with negative dielectric anisotropy (Δε<0). In this VA-LCD, a polynorbornene-based polymer film is used as a protective film and / or a negative C-plate retardation film for the upper polarizing plate and / or the lower polarizing plate. Thus, high contrast characteristics of the frontal viewing angle and the oblique viewing angle can be achieved, and the color change of the oblique viewing angle can be minimized.

Description

technical field [0001] The present invention relates to a liquid crystal display (LCD) having good viewing angle characteristics. More particularly, the present invention relates to a vertical alignment type LCD (VA-LCD) including liquid crystals having negative dielectric anisotropy (Δε<0). Background technique [0002] Negative C-plate compensation films for use in conventional liquid crystal displays (LCDs) are disclosed in US Patent No. 4,899,412. The main function of the negative C-plate compensation film is to compensate the black state of vertically aligned LCDs (VA-LCDs) with no voltage applied. However, VA-LCDs including only negative C-plate compensation films suffer from light leakage at oblique corners due to incomplete viewing angle compensation. [0003] The combination of a negative C-plate compensation film and an A-plate compensation film is disclosed in US Patent No. 6,141,075. According to the technology disclosed in this patent, a good viewing angle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/13363G02F1/1337G02F1/137G02F1/139
CPCG02F1/133634G02F1/1393G02F1/13712G02F1/1335
Inventor 全柄建刘正秀谢尔盖耶·别利亚夫金源国全成浩尹性澈林兑宣金宪李贞旼
Owner LG CHEM LTD
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