In-plane switching mode liquid crystal display

A liquid crystal display, internal switching technology, applied in the direction of instruments, optics, nonlinear optics, etc., can solve problems such as difficult to manufacture thin products, low economic benefits, changes in polarization and color, and achieve the effect of ensuring a wide viewing angle

Active Publication Date: 2012-09-19
DONGWOO FINE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elliptical polarized light creates a problem: Polarization and color change in the liquid crystal cell
[0009] In-plane switching mode liquid crystal displays use three compensation film-type coupled polarizing plates formed by laminating two layers with different optical properties on one side of the liquid crystal layer (one isotropic film below and two above Compensation layer), or using a Z-axis alignment film that is difficult to have a large area due to the lower economic efficiency and the necessary shrinking process caused by using a shrink film in the manufacturing process
[0010] Therefore, it is difficult to manufacture a thin product due to the use of a coupled polarizing plate laminated by three compensation films; bending due to changes in temperature or humidity due to the difference in thickness on both sides of the liquid crystal cell; moreover, due to the use of expensive compensation films lower price competitiveness, its use is limited to high-cost in-plane switching mode LCDs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087] According to the actual measured data of each optical film of the present invention, liquid crystal cell and backlight module with figure 1 The stacked structure shown was applied to TECH WIZ LCD 1D (Sanayi System Co., Ltd., Korea). described in detail below figure 1 Structure.

[0088] Starting from the backlight module 40 side, a lower polarizing plate 20, an in-plane switching mode liquid crystal cell 30 (when no voltage is applied, the liquid crystal cell has a 0 ° liquid crystal alignment) and the upper polarizing plate 10, wherein the lower polarizing plate 20 is formed by laminating the second compensation film 24, the polarizing plate 21 and the protective film 23 from the liquid crystal cell 30 side, and the lower polarizing plate 20 is formed by laminating the second compensation film 24 from the liquid crystal cell 30 side. A compensation film 14 , polarizing plate 11 and protective film 13 form the upper polarizing plate 10 .

[0089] As for the liquid cr...

example 2

[0108] Although the configuration is the same as in Example 1, the thickness of the cell is adjusted so that at a wavelength of 589 nm, the retardation of the liquid crystal cell is 380 nm, and the second compensation film 24 has an in-plane retardation (R0) of 200 nm and a refractive index ratio (NZ ), and the first compensation film 14 has an in-plane retardation (R0) of 70 nm and a refractive index ratio (NZ) of -1.9, and an in-plane switching mode is fabricated using the second compensation film 24 and the first compensation film 14 LCD Monitor.

[0109] The variation of the polarization state of an in-plane switching-mode liquid crystal display on a Poincaré sphere depending on wavelength versus Figure 5 Similarly, moreover, the transmittance results for all light directions are the same as Figure 7 same. able to pass Figure 7 Confirm that since the blue portion is wider at the center, a wider viewing angle is ensured.

example 3

[0111] Although the configuration is the same as in Example 1, the thickness of the cell is adjusted so that at a wavelength of 589 nm, the phase difference of the liquid crystal cell is 380 nm, and the second compensation film 24 has an in-plane retardation (R0) of 150 nm and a refractive index ratio (NZ ), and the first compensation film 14 has an in-plane retardation (R0) of 150 nm and a refractive index ratio (NZ) of -1, and an in-plane switching mode is fabricated using the second compensation film 24 and the first compensation film 14 LCD Monitor.

[0112] The variation of the polarization state of an in-plane switching-mode liquid crystal display on a Poincaré sphere depending on wavelength versus Figure 5 Similarly, moreover, the transmittance results for all light directions are the same as Figure 8 same. able to pass Figure 8 Confirm that since the blue portion is wider at the center, a wider viewing angle is ensured.

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Abstract

The present invention relates to an in-plane switching mode liquid crystal display, and more preciesly, an in-plane switching mode liquid crystal display including an upper polarizing plate, a lower polarizing plate and a liquid crystal cell, designed to have wide viewing angle because the optical properties of the compensation film are determined by changes of the polarization state of liquid crystal alignment on a Poincare Sphere, and the contrast in the inclined visual direction is improved due to the configuration of a slow axis of a first and second compensation films, absorption axis of the polarizer, and the liquid crystal alignment.; The present invention can implement mass production of thin liquid crystal displays with high yield (reducing defect ratio due to foreign substances or impurities) since it is possible to ensure a wide viewing angle with only one sheet of compensation film for the upper polarizing plate and the lower polarizing plate.

Description

technical field [0001] The present invention relates to an in-plane switching mode liquid crystal display capable of securing a wide viewing angle by improving contrast in oblique viewing directions. Background technique [0002] Liquid crystal displays (LCDs) are widely used as general image displays. Although it has various excellent characteristics, a narrow viewing angle is pointed out as a drawback. [0003] The modes of liquid crystal displays can be classified according to the initial alignment of liquid crystal cells, the structure of electrodes, and the properties of liquid crystals, and the most commonly used modes of liquid crystal displays are twisted nematic (TN) mode, vertical alignment (VA) mode, and in-plane switching ( IPS) mode. [0004] In addition, according to whether it transmits light when no voltage is received, it is divided into normally black mode and normally white mode. According to the area and initial arrangement of the liquid crystal, the VA...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02B5/30
CPCG02F2413/08G02F2413/05G02F2413/02G02F2413/13G02F2001/134372G02F1/13363G02B5/3083G02F1/134372G02B5/30G02F1/1335
Inventor 金奉春
Owner DONGWOO FINE CHEM CO LTD
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