KR20110112160A - Ips mode liquid crystal display device and method for fabricating the same - Google Patents

Abstract

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄일 수 있고, 폴링 타임(falling time)을 1/6 이상 단축할 수 있다. 또한, 구동 전압을 줄일 수 있고 액정 셀의 두께를 조절할 수 있다.
본 발명에 따른 횡전계방식 액정표시소자는 컬러필터가 형성된 제 1 기판과; 공통 전극과 화소 전극이 형성된 제 2 기판과; 상기 제 1 및 제 2 기판의 대향 면에 각각 형성된 배향막과; 상기 제 1 및 제 2 기판 사이에 형성되며, 상기 배향막의 러빙 방향에 따라 초기 배향방향이 결정되는 액정 층과; 상기 제 1 및 제 2 기판의 외주 면에 형성되며, 편광 축이 서로 직교하는 제 1 및 제 2 편광판; 및 상기 제 2 편광판과 상기 제 2 기판 사이에 형성되며, 광축이 액정 방향자의 광축과 직교하고 동일한 위상지연 값을 가지는 위상지연 플레이트(plate);를 포함하여 구성한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transverse electric field type liquid crystal display device and a method of manufacturing the same. A phase delay plate having an optical axis orthogonal to the long axis of a liquid crystal director and having the same retardation value includes an upper polarizing plate and an IPS. The liquid crystal cell is formed between the liquid crystal cell and rotates according to the phase delay value of the liquid crystal cell and the phase delay plate.

By implementing the IPS liquid crystal cell to have a phase delay value of, the cell gap can be reduced by more than half and the falling time can be reduced by 1/6 or more than the conventional IPS liquid crystal cell. In addition, the driving voltage can be reduced and the thickness of the liquid crystal cell can be adjusted.
A transverse electric field liquid crystal display device according to the present invention comprises: a first substrate on which a color filter is formed; A second substrate having a common electrode and a pixel electrode formed thereon; Alignment films formed on opposite surfaces of the first and second substrates, respectively; A liquid crystal layer formed between the first and second substrates and having an initial alignment direction determined according to a rubbing direction of the alignment layer; First and second polarizing plates formed on outer circumferential surfaces of the first and second substrates, and the polarization axes are perpendicular to each other; And a phase delay plate formed between the second polarizing plate and the second substrate and having an optical axis orthogonal to the optical axis of the liquid crystal director and having the same phase delay value.

Description

Transverse electric field type liquid crystal display device and its manufacturing method {IPS Mode Liquid Crystal Display Device And Method for Fabricating The Same}

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄일 수 있고 폴링 타임(falling time)을 1/6 이상 단축할 수 있는 횡전계방식 액정표시소자 및 그의 제조 방법에 관한 것이다.
The present invention relates to an In-Plane Swithching Mode (IPS mode) liquid crystal display device and a manufacturing method thereof, and more particularly, the liquid crystal cell is rotated according to the phase delay value of the liquid crystal cell and the phase delay plate.

By implementing the IPS liquid crystal cell to have a phase delay value of, the transverse electric field method can reduce the cell gap by more than half and reduce the falling time by 1/6 or more than the conventional IPS liquid crystal cell. A liquid crystal display device and a method for manufacturing the same.

BACKGROUND ART Liquid crystal display devices, which have recently been spotlighted as flat panel display devices, have been actively studied because of their high contrast ratio, suitable for gray scale display and moving image display, and low power consumption. In particular, it can be manufactured with a thin thickness so that it can be used as an ultra-thin display device such as a wall-mounted TV in the future, and is light in weight and consumes significantly less power than a CRT CRT. It is being used as a next generation display device. In addition, since it is manufactured as a small panel and used as a mobile phone display, its use is various. Such liquid crystal display devices have a variety of modes depending on the nature of the liquid crystal and the structure of the pattern. Specifically, the TN mode (Twisted Nematic Mode) for arranging the liquid crystal directors to be twisted 90 degrees and then applying voltage to control the liquid crystal directors, and by dividing one pixel into several domains, varying the main viewing angle direction of each domain to obtain a wide viewing angle. Multi-domain mode to implement, OCB mode (Optically Compensated Birefringence Mode) to compensate the phase change of light according to the direction of light by attaching the compensation film to the outer surface of the substrate, An in-plane switching mode in which the directors of the liquid crystal are twisted in parallel planes of the alignment layer by forming two electrodes, and a VA such that the long axis of the liquid crystal compound is vertically aligned with the plane of the alignment layer by using a negative liquid crystal and a vertical alignment layer. Various such as vertical alignment.

The TN mode liquid crystal display device turns on / off an electric field in a direction perpendicular to the substrate so that the director of the liquid crystal compound has an angle between 0 ° and 90 ° with respect to the substrate. Driving the liquid crystal compound has advantages of easy monochrome display, high speed response and low driving voltage. However, since the TN mode liquid crystal display device drives the liquid crystal compound perpendicular to the substrate as described above, there is a disadvantage that the viewing angle characteristics are not excellent. That is, the viewing angle dependence in which the screen color or brightness of the image changes according to the direction or angle of viewing the liquid crystal display device is caused. Therefore, in order to overcome these disadvantages, a new wide viewing angle technology, namely, a transverse electric field (IPS mode) liquid crystal display device, in which a liquid crystal compound is driven in a horizontal state with respect to a substrate, has been actively studied.

The transverse electric field type liquid crystal display device is generally composed of a color filter layer array substrate and a thin film transistor array substrate which are disposed to face each other and have a liquid crystal layer therebetween, and the viewing angle of the device is excellent because the liquid crystal layer is horizontally switched by a transverse electric field. Become. However, due to the inherent characteristics of the liquid crystal compound, there is a time delay in controlling the molecular arrangement of the liquid crystal and the response speed of the liquid crystal compound is lower than the frame conversion speed. This is the main reason for blurring the outline of the screen or degrading the quality when implementing moving images. Hereinafter, a transverse electric field type liquid crystal display device according to the prior art will be described in detail with reference to the accompanying drawings.

1 is a plan view of a thin film transistor array substrate of a transverse electric field type liquid crystal display device according to the prior art.

A general transverse electric field type liquid crystal display device includes a color filter layer array substrate with a color filter layer, a thin film transistor array substrate with a thin film transistor, and a liquid crystal layer interposed between the two substrates. An alignment film is provided on the inner surfaces of the two substrates. Specifically, on the thin film transistor array substrate, as shown in FIG. 1, the gate wiring 12 arranged in one direction on the substrate and arranged in a direction perpendicular to the gate wiring 12 to define a pixel region. The thin film transistor TFT disposed at the intersection of the data line 15, the gate line 12, and the data line 15, and the common line 25 disposed in the pixel to be parallel to the gate line 12. And a plurality of common electrodes 24 branched from the common wiring 25, and a plurality of pixel electrodes 17 connected to the thin film transistor TFT and parallel to the common electrode between the common electrodes 24. It is provided. A gate insulating film (not shown) is further provided on the front surface including the gate wiring 12, and a protective film (not shown) is further provided on the front surface including the data wiring 15. In this case, the common wiring 25 and the common electrode 24 are integrally formed, and the gate electrodes of the gate wiring 12 and the TFT are integrally formed, and the common wiring 25 and the common electrode are integrally formed. (24), the gate wiring 12 and the gate electrode are collectively formed in the same layer using a low resistance metal. In addition, the pixel electrode 17 may cross the common electrode 24 by using a transparent conductive metal having a relatively high transmittance of light, such as indium-tin-oxide (ITO), as a material. It is formed in a plurality of branches so as to contact the drain electrode of the thin film transistor to receive a voltage. The color filter layer array substrates are opposed to each other to face the thin film transistor array substrate. A liquid crystal layer is provided between the substrates to complete the liquid crystal display device.

The first and second polarizing plates having polarization axes perpendicular to each other are attached to the outer peripheral surfaces of the two substrates, and an alignment layer is further provided on the inner surfaces of the two substrates. The rubbing direction of the alignment layer is parallel to the polarization axis of any one polarizing plate to be normally black mode. In the transverse electric field liquid crystal display device configured as described above, when a voltage of 0 V is applied to the common electrode 24 and a predetermined voltage (for example, 8 V) is applied to the pixel electrode 17, a transverse electric field is formed between the two electrodes. The long axis of the liquid crystal compound is arranged in parallel with the transverse electric field. If the dielectric anisotropy of the liquid crystal is negative, the short axis of the liquid crystal compound is arranged side by side in the electric field.

Specifically, when no voltage is applied to the liquid crystal display device, as shown in FIG. 2, the liquid crystal compound 32 is arranged in the initial alignment direction so that light does not pass through the transmission axis of the polarizing plate to display a black state. When a voltage is applied to the device, as shown in FIG. 3, the liquid crystal compound 32 is arranged in a direction that is 45 degrees to the transmission axis of the polarizing plate, thereby displaying a white state by transmitting light.

4 is a cross-sectional view showing a basic structure of a transverse electric field type liquid crystal display device, and FIG. 5 is a view showing a driving principle of an IPS liquid crystal display device.

In the conventional transverse electric field type liquid crystal display device, a polarizer (Polarizer, Analyzer) having a polarization direction orthogonal to each other is formed on the upper and lower portions of the IPS liquid crystal cell. The initial alignment direction of the liquid crystal compound of the IPS liquid crystal cell is determined along the rubbing direction of the alignment layer coated on the two substrates facing each other.

When no voltage is applied to the two electrodes (common electrode and pixel electrode) of the transverse electric field type liquid crystal display device, rubbing of an alignment layer in which a liquid crystal compound is applied to opposite surfaces of the substrate in the liquid crystal layer as shown in FIG. Arranged along the direction, the screen appears black. That is, when no voltage is applied to the electrode, light passing through the lower polarizer passes through the IPS liquid crystal cell having the same optical axis as that of the polarizer, but is orthogonal to the polarization axis of the IPS liquid crystal cell. The upper polarizer having one optical axis does not pass and the screen is displayed in a black state.

On the other hand, when a voltage is applied to the two electrodes (common electrode and pixel electrode) of the transverse electric field type liquid crystal display device, the liquid crystal compound 32 is arranged in the direction of 45 degrees to the transmission axis of the polarizing plate as shown in FIG. As the light is transmitted, the screen appears white. That is, when a voltage is applied to the electrode, the light passing through the lower polarizer passes through the liquid crystal cell rotated by 45 ° due to the electric field and rotates by a phase delay value of λ / 2 to pass through the upper polarizer. The screen is displayed in white.

In this case, the transmittance T of the transverse electric field liquid crystal display device is defined by Equation 1 below.

는 액정화합물의 광축과 편광판의 편광 축이 이루는 각이고,

는 액정화합물의 굴절율 이방성이고,

는 입사되는 광 파장이고,

는 상하 기판 사이의 거리 또는 갭(액정 층의 두께)를 나타낸다.here,

Is the angle between the optical axis of the liquid crystal compound and the polarization axis of the polarizing plate,

Is the refractive index anisotropy of the liquid crystal compound,

Is the wavelength of incident light,

Represents the distance or gap (thickness of the liquid crystal layer) between the upper and lower substrates.

)이 π/4(45°)이고,

가 1/2일 때 최대가 된다. 이를 만족시키기 위해서는 액정화합물의

가

가 되어야 하고, 전계 인가시 액정화합물이 전계 방향으로 틀어지는 각도가 45°이상이 되어야 한다.According to Equation 1, in the conventional transverse electric field type liquid crystal display device, the angle between the polarization axis of the polarizing plate and the optical axis of the liquid crystal compound (

) Is π / 4 (45 °),

Is maximum when 1/2 is. In order to satisfy this,

end

When the electric field is applied, the angle at which the liquid crystal compound is twisted in the direction of the electric field should be 45 ° or more.

If the angle formed between the rubbing axis of the alignment film and the electric field is 45 ° or less, when the liquid crystal having a positive dielectric anisotropy is used, the liquid crystal compound is twisted only 45 ° or less, thereby reaching a maximum transmittance. On the other hand, when a liquid crystal having a negative dielectric anisotropy is used, the liquid crystal compound is twisted by 90-ψ (psi is 45 degrees or less), which leads to a maximum transmittance.

If the angle formed between the rubbing axis of the alignment film and the electric field is 45 ° or more, the liquid crystal compound is twisted by an angle of 45 ° or more when the liquid crystal having a positive dielectric anisotropy is used. As a result, a 45 ° section is passed during the operation twisting in parallel with the electric field, thus reaching the maximum transmittance. On the other hand, when a liquid crystal having a negative dielectric anisotropy is used, the liquid crystal compound is twisted by 90-ψ (ψ is 45 degrees or more), and thus the maximum transmittance cannot be obtained.

6 and 7 are graphs showing transmittances when voltages of 8V and 9V are applied to an IPS mode LCD, and Table 1 below shows the transmittance and rising time of the liquid crystal compound when the voltages of 8V and 9V are applied to the electrodes. Rising time) and falling time (falling time) are shown, respectively.

As shown in Table 1, when the 8V voltage is applied to the IPS mode liquid crystal display, the director of the liquid crystal rotates 45 ° to realize the best brightness, and the falling time of 12.7701 ㎳ Had

On the other hand, when a voltage of 9V or more is applied to the IPS mode liquid crystal display, an overshoot phenomenon occurs as shown in FIG. 7 because the director of the liquid crystal rotates 45 ° or more.

As described above, in the conventional IPS mode liquid crystal display, when a voltage is applied to the common electrode and the pixel electrode, a transverse electric field parallel to the substrate is generated between the common electrode and the pixel electrode, so that the liquid crystal compound is formed according to the transverse electric field. By being oriented in a horizontal state with respect to, there is an advantage that the wide viewing angle characteristic is secured as compared to the conventional liquid crystal display device. However, the problem is that the response speed is slower than that of the conventional TN mode liquid crystal display device, making it difficult to cope with moving images.

Therefore, some methods for speeding up the response speed of the liquid crystals have been proposed in the related art, and one of the methods is to reduce the viscosity of the liquid crystal compound so that the liquid crystal compound is easily displaced with respect to the torque received from the electric field. In other words, by lowering the viscosity of the liquid crystal compound, the elastic torque of the liquid crystal compound was lowered among the electric field torque received by the liquid crystal compound and the elastic torque of the liquid crystal compound. As a result, when the electric field torque is constant, the angular acceleration received by the liquid crystal compound is increased by decreasing the elastic torque. However, in this case, since the elastic torque of the liquid crystal compound is lowered, there is a problem in that the falling time is long in the field off state. In other words, the decrease in the viscosity of the liquid crystal compound causes a decrease in the restoring force to return to the equilibrium state in which the liquid crystal compound is artificially twisted by the electric field, thereby increasing the falling time of the liquid crystal compound.

In practice, in order to improve the response speed of the liquid crystal compound, in addition to the rising time required for the liquid crystal compound to be twisted by an electric field, the polling time required for restoring to equilibrium is considered. The lowering method alone cannot sufficiently improve the overall response speed.

Hereinafter, the prior art for improving the response speed in the conventional transverse electric field type liquid crystal display device (element) is as follows.

First, Korean Laid-Open Patent Publication No. 2007-0001721 (hereinafter referred to as “prior art 1”) relates to an IPS mode liquid crystal display device capable of shortening a falling time of liquid crystals and improving a response speed. As shown in FIG. 8, the liquid crystal composition formed between the first substrate and the second substrate is formed of a liquid crystal composition composed of a liquid crystal compound having positive dielectric anisotropy and a liquid crystal compound having negative dielectric anisotropy, thereby forming a common electrode and When the maximum voltage is applied to the pixel electrode, the twisted angle between the liquid crystal composition constituting the liquid crystal layer has a maximum of 90 degrees.

Next, Korean Patent Publication No. 2005-0070714 (hereinafter referred to as "prior art 2") relates to a semi-transmissive planar driving mode liquid crystal display device having a ferroelectric liquid crystal alignment film, and includes a plurality of at least one transmissive part and a reflecting part. A ferroelectric liquid crystal layer formed on the first substrate and the second substrate including pixels, reflecting means formed on a reflecting portion of the first substrate to reflect incident light, and a liquid crystal formed between the first substrate and the second substrate A layer and electrodes formed on the first substrate and the second substrate, respectively, to apply different voltages to the transmission portion and the reflection portion. The prior art 2 uses ferroelectric liquid crystal as an alignment layer and applies different voltages to the transmissive part and the reflecting part to make the transmittance of the transmissive part and the reflecting part substantially the same, thereby improving the switching speed and the response speed of the IPS mode liquid crystal display device.

Next, Korean Patent Laid-Open Publication No. 2007-0002225 (hereinafter referred to as "prior art 3") relates to a transverse electric field type liquid crystal display device having an improved response speed without decreasing the aperture ratio, and the liquid crystal alignment angle in one unit pixel region. In order to realize a multi, the common electrode and the pixel electrode are formed at multiple angles, thereby improving the response speed and transmittance without reducing the aperture ratio.

Next, Korean Patent Publication No. 2008-0061265 (hereinafter referred to as "prior art 4") relates to a liquid crystal display device which improves the response speed of liquid crystals without reducing parameters such as elastic constants. A liquid crystal display device having an IPS structure in which a set of electrodes is designed on a substrate and generates a transverse electric field between the display electrode and the counter electrode, wherein the set of electrodes on the substrate is interposed with an insulating layer on the set of electrodes. By repeating stacking a new set of electrodes by stacking a set of three or more sets of electrodes and changing the transverse electric field direction generated by each stage, the orientation of the liquid crystals is twisted in 2π periods. It is characterized by having an electrode structure.

의 위상지연 값을 갖는 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄일 수 있고 폴링 타임(falling time)을 1/6 이상 단축할 수 있는 횡전계방식 액정표시소자 및 그의 제조 방법을 제시하는 데 있다.Technical problem to be solved by the present invention to solve the above problems, regardless of the type and viscosity of the liquid crystal compound

By implementing an IPS liquid crystal cell having a phase delay value of, the lateral electric field system can reduce the cell gap by more than half and reduce the falling time by 1/6 or more than the conventional IPS liquid crystal cell. A liquid crystal display device and a method of manufacturing the same are provided.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현한 횡전계방식 액정표시소자 및 그의 제조 방법을 제시하는 데 있다. In addition, another technical problem to be achieved by the present invention is that the liquid crystal cell is rotated in accordance with the phase delay value of the liquid crystal cell and the phase delay plate

The present invention provides a transverse electric field type liquid crystal display device implementing the IPS liquid crystal cell to have a phase delay value of and a manufacturing method thereof.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현한 횡전계방식 액정표시소자 및 그의 제조 방법을 제시하는 데 있다. In addition, another technical problem to be achieved by the present invention is to form a phase delay plate between the upper polarizer and the IPS liquid crystal cell whose optical axis is orthogonal to the long axis of the liquid crystal director and has the same retardation value. The liquid crystal cell is rotated according to the phase delay value of the liquid crystal cell and the phase delay plate.

The present invention provides a transverse electric field type liquid crystal display device implementing the IPS liquid crystal cell to have a phase delay value of and a manufacturing method thereof.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 구동전압을 줄일 수 있고 액정 셀의 두께를 조절할 수 있는 횡전계방식 액정표시소자 및 그의 제조 방법을 제시하는 데 있다.
In addition, another technical problem to be achieved by the present invention is that the liquid crystal cell is rotated in accordance with the phase delay value of the liquid crystal cell and the phase delay plate

By implementing an IPS liquid crystal cell to have a phase delay value of, the present invention can provide a transverse electric field type liquid crystal display device capable of reducing a driving voltage and adjusting a thickness of a liquid crystal cell, and a method of manufacturing the same.

The problem of the present invention is not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

As a means for solving the above-described technical problem, the invention as set forth in claim 1 includes: "a transverse electric field type liquid crystal display element comprising: a first substrate having a color filter; A second substrate having a common electrode and a pixel electrode formed thereon; Alignment films formed on opposite surfaces of the first and second substrates, respectively; A liquid crystal cell formed between the first and second substrates and having an initial alignment direction determined according to a rubbing direction of the alignment layer; First and second polarizing plates formed on outer circumferential surfaces of the first and second substrates, and the polarization axes are perpendicular to each other; And a phase delay plate formed between the second polarizing plate and the second substrate and having an optical axis orthogonal to the optical axis of the liquid crystal director and having the same phase delay value. do.

의 위상지연 값을 갖는 것을 특징으로 하는 횡전계방식 액정표시소자.」를 제공한다.According to the invention of claim 2, "The transverse electric field type liquid crystal display device according to claim 1 comprises: the liquid crystal cell is rotated according to the phase delay value of the liquid crystal cell and the phase delay plate.

A transverse electric field liquid crystal display device having a phase delay value of. "Is provided.

의 위상지연 값을 갖는 것을 특징으로 하는 횡전계방식 액정표시소자.」를 제공한다.The invention according to claim 3 is that "the liquid crystal cell according to claim 2 is rotated irrespective of the type and viscosity of the liquid crystal and is always constant.

A transverse electric field liquid crystal display device having a phase delay value of. "Is provided.

의 위상지연 값을 갖는 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상 줄이고, 폴링 타임(falling time)을 1/6 이상 줄인 것을 특징으로 하는 횡전계방식 액정표시소자.」를 제공한다.The invention according to claim 4, wherein the transverse electric field liquid crystal display device according to claim 1 is:

A transverse electric field type liquid crystal display device characterized in that a cell gap is reduced by more than half and a falling time is reduced by 1/6 or more than that of an IPS liquid crystal cell having a phase delay value of.

(0.25

)의 위상지연 값을 가지면 액정의 방향자(director)가 90°회전하여

의 위상지연 값을 갖는 화이트(White) 상태로 구현하는 것을 특징으로 하는 횡전계방식 액정표시소자.」를 제공한다.The invention according to claim 5, wherein the transverse electric field type liquid crystal display device comprises: the liquid crystal cell and the phase delay plate

(0.25

Has a phase delay value of), the director of the liquid crystal rotates by 90 °

And a transverse electric field type liquid crystal display device characterized in that it is embodied in a white state having a phase delay value of.

(0.25

) 이상의 위상지연 값을 가지면 소자의 위상지연 값이

을 갖도록 액정의 방향자(director)가 회전하여 화이트(White) 상태로 구현하는 것을 특징으로 하는 횡전계방식 액정표시소자.」를 제공한다.According to the sixth aspect of the present invention, "the transverse electric field type liquid crystal display device according to claim 1, wherein the liquid crystal cell and the phase delay plate are

(0.25

If the phase delay value is larger than

It provides a transverse electric field type liquid crystal display device, characterized in that to implement a white state by rotating a director (director) of the liquid crystal to have a.

The invention according to claim 7, wherein "the phase delay plate has: a transverse electric field type liquid crystal display element having a 45 degree angle with the polarization axis of said first and second polarizing plates." do.

According to the eighth aspect of the present invention, "The angle of the polarization axis of the first polarizing plate is 120 °, the rubbing angle of the alignment film is 15 °, the angle of the optical axis of the phase delay plate is 165 °, And an angle of a polarization axis of the second polarizing plate 270 at 210 °.

The invention according to claim 9 provides "the transverse field type liquid crystal display device according to claim 1, wherein the phase delay plate is any one of a positive plate and a negative plate. ' .

The invention according to claim 10, wherein the retardation plate comprises: a uniaxial film of a birefringent medium having one optical axis, a biaxial film having two optical axes, or an RM (Reactive). Mesogens), and a transverse electric field type liquid crystal display element characterized by the above-mentioned.

In addition, as another means for solving the above-described technical problem, the invention as set forth in claim 11 includes the steps of: (a) manufacturing a IPS mode liquid crystal cell; (b) forming a phase delay plate on one side of the IPS mode liquid crystal cell having an optical axis perpendicular to the optical axis of the liquid crystal director and having the same phase delay value; And (c) forming first and second polarizing plates having polarization axes orthogonal to each other on an outer circumferential surface of the IPS mode liquid crystal cell having the phase delay plate formed on one side thereof. .

의 위상지연 값을 갖도록 하는 것을 특징으로 하는 횡전계방식 액정표시소자의 제조 방법.」을 제공한다.According to the invention according to claim 12, "The method of manufacturing the transverse electric field type liquid crystal display device according to claim 11, wherein: the liquid crystal cell is rotated in accordance with the phase delay value of the liquid crystal cell and the phase delay plate

To provide a phase delay value of?.

(0.25

)의 위상지연 값을 가지면 액정의 방향자(director)가 90°회전하여

의 위상지연 값을 갖는 화이트(White) 상태로 구현하는 것을 특징으로 하는 횡전계방식 액정표시소자의 제조 방법.」을 제공한다.According to the invention according to claim 13, "The method of manufacturing the transverse electric field type liquid crystal display device according to claim 11, wherein: the liquid crystal cell and the phase delay plate

(0.25

Has a phase delay value of), the director of the liquid crystal rotates by 90 °

It provides a method of manufacturing a transverse electric field type liquid crystal display device, characterized in that the white state having a phase delay value of.

) 이상의 위상지연 값을 가지면 소자의 위상지연 값이

을 갖도록 액정의 방향자(director)가 회전하여 화이트(White) 상태로 구현하는 것을 특징으로 하는 횡전계방식 액정표시소자의 제조 방법.」을 제공한다.
According to the invention according to claim 14, "The method of manufacturing the transverse electric field type liquid crystal display device according to claim 11, wherein: the liquid crystal cell and the phase delay plate (0.25

If the phase delay value is larger than

It provides a method of manufacturing a transverse electric field type liquid crystal display device, characterized in that to realize a white state by rotating a director (director) of the liquid crystal to have a.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄일 수 있고, 폴링 타임(falling time)을 1/6 이상 단축할 수 있는 효과가 있다.According to the present invention, a phase delay plate having an optical axis orthogonal to the long axis of the liquid crystal director and having the same retardation value is formed between the upper polarizing plate and the IPS liquid crystal cell to form a liquid crystal cell and a phase delay plate. The liquid crystal cell rotates according to the phase delay value of

By implementing the IPS liquid crystal cell to have a phase delay value of, the cell gap can be reduced by more than half and the falling time can be shortened by 1/6 or more than the conventional IPS liquid crystal cell. have.

의 위상지연 값을 갖는 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄일 수 있고 폴링 타임(falling time)을 1/6 이상 단축할 수 있는 효과가 있다.In addition, regardless of the type and viscosity of the liquid crystal compound

By implementing the IPS liquid crystal cell having a phase delay value of, the cell gap can be reduced by more than half and the falling time can be shortened by 1/6 or more than the conventional IPS liquid crystal cell. .

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 구동전압을 줄일 수 있고 액정 셀의 두께를 조절할 수 있다.
In addition, the liquid crystal cell is rotated according to the phase delay value of the liquid crystal cell and the phase delay plate.

By implementing the IPS liquid crystal cell to have a phase delay value of, the driving voltage can be reduced and the thickness of the liquid crystal cell can be adjusted.

The effects of the present invention are not limited to those mentioned above, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description.

(0.25

)일 때 전압 오프(off) 상태(Black)와 전압 온(on) 상태(White)에서의 액정배열 모습을 나타낸 평면도이고,
도 12는 액정 셀과 위상지연 플레이트의 위상지연 값이

(0.25

) 이상의 값(예를 들어, 0.275

)을 가질 때 전압 오프(off) 상태(Black)와 전압 온(on) 상태(White)에서의 액정배열 모습을 나타낸 평면도이다.
도 13은 본 발명에 의한 IPS 액정표시소자에 전압 인가시의 투과율을 나타낸 그래프1 to 7 are views for explaining a transverse electric field type liquid crystal display device according to the prior art,
1 is a plan view of a thin film transistor array substrate,
2 and 3 are plan views illustrating a liquid crystal array in a voltage off state (black) and a voltage on state (white).
4 is a cross-sectional view showing the basic structure of the IPS mode,
5 is a view showing the driving principle of the IPS liquid crystal display device,
6 and 7 are graphs showing transmittances when voltages of 8V and 9V are applied to an IPS liquid crystal display.
8 is a view showing an example of an IPS mode liquid crystal display device according to the prior art;
9 and 10 are a cross-sectional view and a plan view showing the basic structure of a transverse electric field type liquid crystal display device according to a preferred embodiment of the present invention
11 and 12 are diagrams showing the operating principle of the transverse electric field type liquid crystal display device according to the present invention;
11 shows phase delay values of a liquid crystal cell and a phase delay plate.

(0.25

) Is a plan view showing the arrangement of the liquid crystal in the voltage off (Black) and voltage on (White) when
12 is a phase delay value of a liquid crystal cell and a phase delay plate.

(0.25

) Or a higher value (for example, 0.275

) Is a plan view showing a liquid crystal array in a voltage off state (black) and a voltage on state (white).
13 is a graph showing the transmittance when voltage is applied to the IPS liquid crystal display device according to the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In order to clearly explain the present invention in the drawings, parts not related to the description are omitted, and similar parts are denoted by similar reference numerals throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Lateral electric field method  Embodiment of Liquid Crystal Display Device

9 and 10 are a cross-sectional view and a plan view showing a basic structure of a transverse electric field type liquid crystal display device according to a preferred embodiment of the present invention.

As shown in FIG. 9, in the transverse electric field type liquid crystal display device according to the present invention, first and second polarizing plates 260 and 270 having polarization directions perpendicular to each other are formed on the upper and lower portions of the IPS liquid crystal cell 200. A phase delay plate 300 is formed between the second polarizer 270 and the IPS liquid crystal cell 200.

Here, as shown in FIG. 10, the IPS mode liquid crystal cell 200 includes a first substrate 210 including a common electrode and a pixel electrode, a second substrate 220 including a color filter layer, An alignment layer (not shown) formed on opposite surfaces of the first and second substrates 210 and 220, and a liquid crystal compound (or liquid crystal layer) 250 formed between the first and second substrates 210 and 220, respectively. have. In this case, the initial alignment direction of the liquid crystal compound 250 of the IPS liquid crystal cell 200 is determined along the rubbing direction of the alignment layer coated on the surfaces of the first and second substrates 210 and 220 facing each other.

The first and second polarizers 260 and 270 are formed on outer circumferential surfaces of the first and second substrates 210 and 220 and have polarization axes perpendicular to each other.

The phase delay plate 300 is formed between the second polarizing plate 270 and the second substrate 220, and the optical axis is orthogonal to the optical axis of the liquid crystal director and has the same phase delay value.

The phase delay plate 300 is composed of one of a biaxial film of a birefringent medium having one optical axis, a biaxial film having two optical axes, or a reactive mesogens, and a dielectric constant of the liquid crystal. Depending on the anisotropy, a positive plate or negative plate may be used.

In an embodiment of the present disclosure, the angle of the polarization axis of the first polarizing plate 260 is 120 °, and the rubbing angle of the alignment layer is formed at an angle of 15 ° with respect to the direction of the common electrode and the pixel electrode, and the phase delay plate The angle of the optical axis is 165 °, the angle of the polarization axis of the second polarizing plate 270 is preferably formed to be 210 °, but is not necessarily limited thereto.

)이 되도록 액정의 방향자(director)가 회전하면서 화이트(White) 상태를 구현한다. 이러한 동작은 상기 액정 층의 종류 및 점도와 무관하게 동작이 되어 완전한 블랙(Black) 및 화이트(White) 상태를 구현할 수 있다. 이에 의해, HWP(Half Wave Plate)의 역할을 하기 위해

만큼 위상 지연된 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 반으로 줄일 수 있다. The transverse electric field type liquid crystal display device according to the present invention has an effective retardation value having the highest transmittance according to the phase delay value of the liquid crystal cell and the phase delay plate.

A white state is realized while the director of the liquid crystal rotates to be (). This operation may be performed regardless of the type and viscosity of the liquid crystal layer, thereby realizing a completely black and white state. Thereby, in order to play the role of a half wave plate (HWP)

As a result, the cell gap can be reduced by half than that of the conventional IPS liquid crystal cell, which is delayed in phase.

Hereinafter, the operation principle of the transverse electric field type liquid crystal display device according to the present invention will be described in more detail with reference to the accompanying drawings.

Principle of operation

(0.25

)일 때 전압 오프(off) 상태(Black)와 전압 온(on) 상태(White)에서의 액정배열 모습을 나타낸 평면도이고, 도 12는 액정 셀과 위상지연 플레이트의 위상지연 값이

(0.25

) 이상의 값(예를 들어, 0.275

)을 가질 때 전압 오프(off) 상태(Black)와 전압 온(on) 상태(White)에서의 액정배열 모습을 나타낸 평면도이다.11 and 12 are diagrams showing the operation principle of the transverse electric field type liquid crystal display device according to the present invention, and FIG. 11 is a phase delay value of the liquid crystal cell and the phase delay plate.

(0.25

) Is a plan view showing the arrangement of the liquid crystal in the voltage off state (Black) and the voltage on (white) state, and FIG. 12 is a phase delay value of the liquid crystal cell and the phase delay plate.

(0.25

) Or a higher value (for example, 0.275

) Is a plan view showing a liquid crystal array in a voltage off state (black) and a voltage on state (white).

(0.25

)를 가질 때, 본 발명의 횡전계방식 액정표시소자의 동작은 다음과 같다.First, the phase delay values of the liquid crystal cell and the phase delay plate

(0.25

), The operation of the transverse electric field type liquid crystal display device of the present invention is as follows.

Referring to FIG. 11, when no voltage is applied to the electrodes (common electrode and pixel electrode) (FIG. 11A), the rubbing direction of the alignment layer in which the liquid crystal compound is applied to the opposite surface of the substrate in the liquid crystal layer is illustrated. Arranged along the screen, the screen appears black. That is, when no voltage is applied to the electrode, the light passing through the lower first polarizing plate 260 does not pass through the IPS liquid crystal cell having the polarized axis of the first polarizing plate 260 and the twisted optical axis of 45 °. This is shown in the black state.

를 가지므로 상기 액정화합물(250)의 방향자(director)가

(90°)만큼 회전하여 상기 위상지연 플레이트(300)의 광축과 일치하게 된다. 따라서 상기 제 1 편광판(260)을 통과한 광(光)이 상기 액정화합물(250)과 상기 위상지연 플레이트(300)를 통해

만큼 회전한 후 상기 제 2 편광판(270)의 편광 축을 통해 밖으로 출력됨으로써, 화면이 화이트(white) 상태로 나타난다. 즉, 전극에 전압이 인가되면 하부의 편광판(Polarizer)을 통과한 빛이 전계로 인해 90°회전한 액정 셀을 통과하면서 위상지연 값인

만큼 회전하여 상부의 제 2 편광판(270)을 통과함으로써, 화면이 화이트 상태로 표시된다.On the other hand, when a voltage is applied to two electrodes (common electrode and pixel electrode) of the transverse electric field type liquid crystal display device (Fig. 11 (b)), the phase delay value of the liquid crystal cell and the phase delay plate is 0.25

Since the director of the liquid crystal compound 250

Rotation by 90 ° coincides with the optical axis of the phase delay plate 300. Therefore, light passing through the first polarizing plate 260 passes through the liquid crystal compound 250 and the phase delay plate 300.

After rotating as much as the output through the polarization axis of the second polarizing plate 270, the screen appears white (white) state. That is, when voltage is applied to the electrode, light passing through the polarizer below passes through the liquid crystal cell rotated by 90 ° due to the electric field, which is a phase delay value.

By rotating as much as passing through the upper second polarizing plate 270, the screen is displayed in a white state.

In this case, the transmittance T of the transverse electric field type liquid crystal display device is defined by Equation 2 below.

는 액정화합물의 광축과 편광판의 편광 축이 이루는 각이고,

는 액정화합물의 굴절율 이방성이고,

는 입사되는 광 파장이고,

는 상하 기판 사이의 거리 또는 갭(액정 층의 두께)를 나타낸다.here,

Is the angle between the optical axis of the liquid crystal compound and the polarization axis of the polarizing plate,

Is the refractive index anisotropy of the liquid crystal compound,

Is the wavelength of incident light,

Represents the distance or gap (thickness of the liquid crystal layer) between the upper and lower substrates.

)이 π/4(45°)이고,

가 1/2일 때 최대가 된다. 이를 만족시키기 위해서는 액정화합물과 위상지연 플레이트의

가

가 되어야 하고, 전계 인가시 액정화합물이 전계 방향으로 틀어지는 각도가 90°가 되어야 한다.According to Equation 2, in the transverse electric field type liquid crystal display device of the present invention, the angle between the polarization axis of the polarizing plate and the optical axis of the liquid crystal compound (

) Is π / 4 (45 °),

Is maximum when 1/2 is. To satisfy this, the liquid crystal compound and the phase delay plate

end

When the electric field is applied, the angle at which the liquid crystal compound is twisted in the electric field direction must be 90 °.

(0.25

) 이상의 값(예를 들어, 0.275

)을 가진다고 가정할 때, 본 발명의 횡전계방식 액정표시소자의 동작은 다음과 같다.Next, the phase delay values of the liquid crystal cell and the phase delay plate

(0.25

) Or a higher value (for example, 0.275

Assuming that the operation of the transverse electric field type liquid crystal display device of the present invention is as follows.

Referring to FIG. 12, when no voltage is applied to the electrodes (common electrode and pixel electrode) (FIG. 12A), the rubbing direction of the alignment layer in which the liquid crystal compound is applied to the opposite surface of the substrate in the liquid crystal layer is illustrated. Arranged along the screen, the screen appears black. That is, when no voltage is applied to the electrode, the light passing through the lower first polarizing plate 260 does not pass through the IPS liquid crystal cell having the polarized axis of the first polarizing plate 260 and the twisted optical axis of 45 °. This is shown in the black state.

(0.25

) 이상의 값(예를 들어, 0.275

)을 가진다고 가정하면, 액정의 방향자(director)가 90°회전하지 않고 75°회전했을 때 효과적인 지연(effective retardation) 값이

가 되게 되어 화이트(White) 상태를 구현할 수 있다. 즉, 위상지연 플레이트의 위상지연 값인 0.275

와 액정 셀의 방향자가 75°회전했을 때의 위상지연 값을 합하면 0.5

(

)가 되기 때문에 투과율이 높인 화이트(White) 상태를 구현할 수 있다(도 12의 (b) 참조).Meanwhile, the phase delay values of the liquid crystal cell and the phase delay plate are

(0.25

) Or a higher value (for example, 0.275

Assuming that the effective retardation value is obtained when the director of the liquid crystal is rotated 75 ° instead of 90 °.

It becomes to be able to implement a white state (White). That is, 0.275, which is the phase delay value of the phase delay plate.

And the phase delay value when the director of the liquid crystal cell is rotated by 75 °, 0.5

(

), A white state having high transmittance can be realized (see FIG. 12B).

보다 조금 더 큰 값으로 설계하게 된다면, 액정의 방향자(director) 회전각도를 줄이게 되어 구동전압을 줄일 수 있고, 또한 액정 셀의 두께를 조절할 수가 있다.As such, the phase delay value of the liquid crystal cell and the phase delay plate

If it is designed to a slightly larger value, it is possible to reduce the driving angle of the liquid crystal to reduce the driving voltage and to adjust the thickness of the liquid crystal cell.

In practice, the response speed of the liquid crystal compound constituting the liquid crystal layer in the liquid crystal display device is such that the rising time (Tr) and the electric field, which are required for the liquid crystal compound to be displaced along the direction of the electric field when the electric field is formed, have been removed. It is determined by the sum of the falling time (Tf), which is the time required for the liquid crystal compound to return to the initial alignment state.

In other words, the concept of the response speed of the liquid crystal display device is based on the rising time required when changing from the normally black mode to the normally white mode, and the changing time from the standard white mode to the standard black mode. It can be defined and used as the sum of the falling time required.

Where V is the voltage applied to the electrode, Vo is the threshold voltage, d is the cell gap of the panel substrate, γ is the average viscosity of the liquid crystal compound, Δε is the dielectric anisotropy of the liquid crystal compound, and K is the torsional elasticity of the liquid crystal compound. Coefficient of twist elastic constant.

Originally, the elastic modulus K of the liquid crystal compound is not only a torsional elastic modulus but also a concept in which all three factors such as spray modulus and bending modulus are considered. Since the influence of the modulus is negligible compared to the torsional modulus, the elastic modulus in the present invention is defined as the torsional modulus.

The rising time Tr and the falling time Tf may be adjusted through various factors, as expressed in Equation 3 above. First, the rising time Tr may be reduced by decreasing the viscosity of the liquid crystal compound, decreasing the panel cell gap, increasing the dielectric anisotropy of the liquid crystal compound, and increasing the driving voltage, and the falling time Tf may be applied to the applied voltage. Irrespective of the decrease, the viscosity decreases due to a decrease in the viscosity of the liquid crystal compound, an increase in the elastic modulus, and a decrease in the panel cell gap.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 기존의 IPS 액정 셀보다 셀 갭(Cell gap)을 절반 이상으로 줄였다. 따라서, 액정화합물의 폴링 타임을 최소화시켜 액정표시소자의 응답 속도를 크게 향상시킬 수 있었다. Accordingly, in the present invention, a phase delay plate having an optical axis orthogonal to the long axis of the liquid crystal director and having the same retardation value is formed between the upper polarizing plate and the IPS liquid crystal cell, thereby forming the liquid crystal cell and phase. The liquid crystal cell rotates according to the phase delay value of the delay plate

By implementing the IPS liquid crystal cell to have a phase delay value of, the cell gap is reduced by half or more than that of the conventional IPS liquid crystal cell. Therefore, the polling time of the liquid crystal compound may be minimized to significantly improve the response speed of the liquid crystal display device.

In addition, the twist angle of the liquid crystal compound 250 reaches a maximum of 90 degrees. In the conventional IPS mode liquid crystal display, the twist angle of the liquid crystal compound is twice that of the maximum 45 °. As such, an increase in the twist angle of the liquid crystal compound 250 results in an increase in the effective elastic modulus of the liquid crystal compound.

Equation 4 below expresses this principle, indicating that the effective elastic modulus of the liquid crystal compound is proportional to the twist angle of the liquid crystal compounds.

Where K is the intrinsic elastic modulus of the liquid crystal compound, θ is the twist angle of the liquid crystal compound, and K 'is the effective elastic modulus of the liquid crystal compound.

Therefore, an increase in the effective elastic modulus of the liquid crystal compound means a substantial increase in elastic force, resulting in an increase in the restoring force to the equilibrium state. In addition, the increase in the restoring force of the liquid crystal compound shortens the falling time in the liquid crystal display device, thereby realizing a high-speed response.

Transmittance

FIG. 13 is a graph showing transmittance when voltage is applied to an IPS liquid crystal display device according to the present invention. (rising time) and falling time (falling time) are shown, respectively.

Comparing Table 1 and Table 2, the rising time was reduced by more than half from the existing 7.80077 [ms] to 3.69493 [ms], and especially in the case of the falling time, the existing 12.7701 [ ms] to 2.74786 [ms], a 1/6 decrease.

의 위상지연 값을 갖도록 IPS 액정 셀을 구현함으로써, 본 발명의 기술적 과제를 해결할 수가 있다.
The transverse field type liquid crystal display device and the method of manufacturing the same of the present invention configured as described above have a phase delay plate having an optical axis perpendicular to the long axis of the liquid crystal director and having the same retardation value. The liquid crystal cell is formed between the liquid crystal cell and rotates according to the phase delay value of the liquid crystal cell and the phase delay plate.

By implementing the IPS liquid crystal cell to have a phase delay value of, it is possible to solve the technical problem of the present invention.

Preferred embodiments of the present invention described above are disclosed to solve the technical problem, and those skilled in the art to which the present invention pertains (man skilled in the art) various modifications, changes, additions, etc. within the spirit and scope of the present invention. It will be possible to, and such modifications, changes, etc. will be considered to be within the scope of the following claims.

200: IPS liquid crystal cell 210: first substrate
220: second substrate 230: common electrode
240: pixel electrode
250: liquid crystal compound or liquid crystal molecule
260: first polarizer 270: second polarizer

Claims (14)

In a transverse electric field liquid crystal display device,
A first substrate on which a color filter is formed;
A second substrate having a common electrode and a pixel electrode formed thereon;
Alignment films formed on opposite surfaces of the first and second substrates, respectively;
A liquid crystal cell formed between the first and second substrates and having an initial alignment direction determined according to a rubbing direction of the alignment layer;
First and second polarizing plates formed on outer circumferential surfaces of the first and second substrates, and the polarization axes are perpendicular to each other; And
A phase delay plate formed between the second polarizing plate and the second substrate and having an optical axis perpendicular to the optical axis of the liquid crystal director and having the same phase delay value;
Transverse electric field type liquid crystal display device comprising a.
The liquid crystal display of claim 1, wherein the transverse electric field type liquid crystal display device comprises:
The liquid crystal cell rotates according to the phase delay value of the liquid crystal cell and the phase delay plate.

A transverse electric field liquid crystal display device having a phase delay value of.
The liquid crystal cell of claim 2, wherein the liquid crystal cell is:
Always rotates regardless of the type and viscosity of the liquid crystal

A transverse electric field liquid crystal display device having a phase delay value of.
The liquid crystal display of claim 1, wherein the transverse electric field type liquid crystal display device comprises:

A transverse electric field type liquid crystal display device, wherein the cell gap is reduced by more than half and the falling time is reduced by 1/6 or more than that of the IPS liquid crystal cell having a phase delay value of.
The liquid crystal display of claim 1, wherein the transverse electric field type liquid crystal display device comprises:
The liquid crystal cell and the phase delay plate

(0.25

Has a phase delay value of), the director of the liquid crystal rotates by 90 °

A transverse electric field liquid crystal display device, characterized in that implemented in a white state having a phase delay value of.
The liquid crystal display of claim 1, wherein the transverse electric field type liquid crystal display device comprises:
The liquid crystal cell and the phase delay plate

(0.25

If the phase delay value is larger than

The transverse electric field type liquid crystal display device, characterized in that to realize a white state by rotating the director (director) of the liquid crystal to have a.
The method of claim 1, wherein the phase delay plate is:
And a 45 ° angle with the polarization axes of the first and second polarizers.
The method of claim 1,
The angle of the polarization axis of the first polarizing plate is 120 °,
The rubbing angle of the alignment layer is 15 °,
The angle of the optical axis of the phase delay plate is 165 °,
The angle of the polarization axis of the second polarizing plate 270 is formed to 210 °, characterized in that the transverse electric field type liquid crystal display device.
The method of claim 1, wherein the phase delay plate is:
A transverse electric field liquid crystal display device, characterized in that any one of a positive plate and a negative plate.
The method of claim 9, wherein the phase delay plate is:
A transverse electric field type liquid crystal display device comprising one of a biaxial film having a single optical axis, a uniaxial film, a biaxial film having two optical axes, or a reactive mesogens.
In the manufacturing method of the transverse electric field type liquid crystal display device,
(a) manufacturing an IPS mode liquid crystal cell;
(b) forming a phase delay plate on one side of the IPS mode liquid crystal cell having an optical axis perpendicular to the optical axis of the liquid crystal director and having the same phase delay value; And
(c) forming first and second polarizing plates having polarization axes orthogonal to each other on an outer circumferential surface of the IPS mode liquid crystal cell having the phase delay plate formed on one side thereof;
Method of manufacturing a transverse electric field type liquid crystal display device comprising a.
The method of claim 11, wherein the transverse electric field liquid crystal display device is manufactured by:
The liquid crystal cell rotates according to the phase delay value of the liquid crystal cell and the phase delay plate.

A method of manufacturing a transverse electric field type liquid crystal display device, characterized by having a phase delay value of.
The liquid crystal display of claim 11, wherein the transverse electric field type liquid crystal display device comprises:
The liquid crystal cell and the phase delay plate

(0.25

Has a phase delay value of), the director of the liquid crystal rotates by 90 °

A method of manufacturing a transverse electric field type liquid crystal display device, characterized in that implemented in a white state having a phase delay value of.
The method of claim 11, wherein the transverse electric field liquid crystal display device is manufactured by:
The liquid crystal cell and the phase delay plate

(0.25

If the phase delay value is larger than

The method of manufacturing a transverse electric field type liquid crystal display device, characterized in that to realize a white state by rotating the director (director) of the liquid crystal to have a.

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