KR20110085527A - Polymer dispersed liquid crystal display device - Google Patents

Polymer dispersed liquid crystal display device Download PDF

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Publication number
KR20110085527A
KR20110085527A KR1020100005375A KR20100005375A KR20110085527A KR 20110085527 A KR20110085527 A KR 20110085527A KR 1020100005375 A KR1020100005375 A KR 1020100005375A KR 20100005375 A KR20100005375 A KR 20100005375A KR 20110085527 A KR20110085527 A KR 20110085527A
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KR
South Korea
Prior art keywords
liquid crystal
polymer dispersed
dispersed liquid
crystal display
display device
Prior art date
Application number
KR1020100005375A
Other languages
Korean (ko)
Inventor
이승희
임영진
허정화
윤종선
류경화
Original Assignee
전북대학교산학협력단
하이쎌(주)
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Application filed by 전북대학교산학협력단, 하이쎌(주) filed Critical 전북대학교산학협력단
Priority to KR1020100005375A priority Critical patent/KR20110085527A/en
Publication of KR20110085527A publication Critical patent/KR20110085527A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
    • G02F1/13342—Holographic polymer dispersed liquid crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Dispersion Chemistry (AREA)

Abstract

The present invention relates to a polymer dispersed liquid crystal display device using a polymer dispersed dual frequency liquid crystal and a die, wherein the polymer dispersed liquid crystal display device comprises a pair of substrates and a polymer and a die between the substrates. A polymer dispersed liquid crystal layer made of dual frequency liquid crystal and a pair of electrode layers are provided on surfaces of the pair of substrates facing each other. In the present invention, when no voltage is applied to the polymer dispersed liquid crystal display device, light is scattered by the polymer dispersed liquid crystal layer, and the light is absorbed by a predetermined amount by the mixed die to express an intermediate gray scale. When driving the polymer dispersed liquid crystal display, an electric field is formed perpendicular to the substrate by a voltage difference applied to a pair of electrode layers, and when the frequency is low when the electric field is formed, the polymer dispersed liquid crystal layer The long axis of the liquid crystal is arranged perpendicularly to the substrate, and the alignment direction of the die is also vertically arranged on the substrate by the vertically arranged liquid crystal layer so that the liquid crystal display device becomes a transparent state, and when the frequency of the voltage is high, the polymer The major axis of the liquid crystal of the dispersed liquid crystal layer is arranged parallel to the substrate, and the die is doubled by the liquid crystal layer arranged in parallel. Direction are also arranged parallel to the substrate is a dark state.

Description

Polymer dispersed liquid crystal display device {POLYMER DISPERSED LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a polymer dispersed liquid crystal display device using a polymer dispersed dual frequency liquid crystal and a die, and more particularly, to a polymer dispersed liquid crystal display that realizes a transparent state and a dark state by using the intensity of the frequency after forming a vertical electric field. It relates to an element.

Currently, commercially available liquid crystal display devices include transmissive liquid crystal display devices using twisted nematic (TN), patterned vertical alignment (PVA), in-plane switching (IPS), and fringe field switching (FFS) modes. Since the transmissive liquid crystal display device is essentially an attachment type polarizing plate and an alignment film for aligning the liquid crystal, the defect rate is high in the manufacturing process and the manufacturing cost increases accordingly. In addition, the use of two or more polarizing plates that absorb light causes a problem of low luminance, so that PDLC (Polymer Dispersed Liqiud Crystal) or PNLC (Polymer Network Liqiud Crystal), which does not use polarizer and alignment layer Developed. However, a general liquid crystal display device using PDLC or PNLC has a low contrast ratio because it uses light scattering and transmission mode. In addition, the conventional PDLC using NT (Normally Transparent) mode is a mode that transmits light initially and scatters light when a voltage is applied using a vertical alignment layer, but has a small power consumption, but has a disadvantage of poor initial transmittance.

SUMMARY OF THE INVENTION An object of the present invention is to provide a polymer dispersed liquid crystal display device having an easy manufacturing process and excellent luminance characteristics without using an alignment film and a polarizing plate.

In order to achieve the above object, the present invention by using a polymer dispersed dual frequency liquid crystal and a die to control the intensity of the frequency when the vertical electric field is applied to switch the dielectric anisotropy of the liquid crystal to positive and negative to switch the liquid crystal, According to the behavior of the die also switch to provide a polymer dispersed liquid crystal display device displaying a transparent state and a dark state.

The present invention can provide a polymer dispersed liquid crystal display device which is easy in manufacturing process and low in manufacturing cost since a polarizing plate and an alignment film are not used.

In addition, the present invention can provide a polymer dispersed liquid crystal display device having excellent transparency and high contrast ratio.

1 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a first embodiment of the present invention.
2A and 2B are schematic cross-sectional views respectively showing a transparent state and a dark state of a polymer dispersed liquid crystal display according to a first embodiment of the present invention.
3 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a second exemplary embodiment of the present invention.
4A and 4B are schematic cross-sectional views respectively showing a transparent state and a dark state of a polymer dispersed liquid crystal display according to a second exemplary embodiment of the present invention.
5 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a third exemplary embodiment of the present invention.
6A and 6B are schematic cross-sectional views illustrating a transparent state and a dark state of a polymer dispersed liquid crystal display according to a third exemplary embodiment of the present invention, respectively.

The present invention relates to a polymer dispersed liquid crystal display device, wherein the polymer dispersed liquid crystal display device comprises a pair of substrates, a polymer, a dual frequency liquid crystal and a mixed phase of a die, and a polymer dispersed liquid crystal formed between the substrates. A layer, a pair of electrodes disposed on opposite surfaces of the pair of substrates, and light is scattered when no voltage is applied to the polymer dispersed liquid crystal display device, indicating a halftone state, and the pair of electrodes An electric field is formed perpendicularly to the substrate by applying a voltage to the substrate. At this time, when a low frequency voltage is applied to the polymer dispersed liquid crystal display, the liquid crystal has a positive liquid crystal property and is arranged perpendicularly to the substrate. In addition, due to the behavior of the liquid crystal is arranged perpendicular to the substrate becomes a transparent state, the high frequency voltage dispersed the polymer When applied to the liquid crystal display element, and liquid crystal is arranged parallel to ttieo the liquid crystal properties of a negative substrate, the die is also a dark state vertically arranged on the substrate by the liquid crystal behavior.

(First embodiment)

Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a first embodiment of the present invention. As shown, in the polymer dispersed liquid crystal display device according to the first embodiment of the present invention, the polymer dispersed liquid crystal layer 130 is formed between a pair of substrates 100 and 110, and the polymer dispersed liquid crystal layer In the 130, the dual frequency liquid crystal 140 and the die 150 are dispersed in the polymer matrix in the form of droplets 120, and a pair of electrodes is formed on the rear surface of the pair of substrates 100. Not shown) is disposed.

At this time, the polymer dispersed liquid crystal display of the state before applying the voltage is scattered by the light is absorbed to some extent by the mixed die to show a halftone.

2A and 2B are schematic cross-sectional views respectively showing a transparent state and a dark state of a polymer dispersed liquid crystal display according to a first embodiment of the present invention. As shown in FIG. 2A, when a voltage is applied to the pair of electrodes and a low frequency is applied, the liquid crystal has a positive liquid crystal property of positive dielectric anisotropy so that the liquid crystal 140 is arranged in a direction perpendicular to the substrate. The die 150 is also arranged in a direction perpendicular to the substrate in the direction in which the liquid crystal 140 behaves, thereby becoming a transparent state. As shown in FIG. 2B, when a voltage is applied to the pair of electrodes and a high frequency is applied, the liquid crystal has a negative liquid crystal property of negative dielectric anisotropy, so that the liquid crystal 140 is arranged in a direction parallel to the substrate. In addition, the die 150 is also arranged in a direction parallel to the substrate in the direction in which the liquid crystal behaves, resulting in a dark state.

Meanwhile, another embodiment of the polymer dispersed liquid crystal layer 130 of the polymer dispersed liquid crystal display according to the present invention may be any one of PDN, PNLC, PSLC (Polymer Stabilized Liquid Crystal), PSFLC (Polymer Stabilized Ferroelectric Liquid Crystal), and the like. May optionally be used.

(Second embodiment)

Hereinafter, the structure and operation of the polymer dispersed liquid crystal display device according to the second embodiment of the present invention will be described in detail with reference to the accompanying drawings. 3 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a second exemplary embodiment of the present invention. As shown, in the polymer dispersed liquid crystal display device according to the second embodiment of the present invention, the polymer dispersed liquid crystal layer 230 is formed between the pair of substrates 200 and 210, and the polymer dispersed liquid crystal layer In the 230, the dual frequency liquid crystal 240 and the die 250 are composed of PNLC continuously contained in the 3D polymer network 220 structure, and the rear surface of the pair of substrates 200. 210 facing each other. A pair of electrodes (not shown) is disposed in the chamber. 4A and 4B are schematic cross-sectional views respectively showing a transparent state and a dark state of a polymer dispersed liquid crystal display according to a second exemplary embodiment of the present invention. Since the operation principle of the polymer dispersed liquid crystal display device having the polymer dispersed liquid crystal layer made of the PNLC is the same as the operation principle of the first embodiment, redundant description thereof will be omitted.

(Third embodiment)

Hereinafter, the structure and operation of the polymer dispersed liquid crystal display according to the third embodiment of the present invention will be described in detail with reference to the accompanying drawings. 5 is a schematic cross-sectional view of a polymer dispersed liquid crystal display device according to a third exemplary embodiment of the present invention. As shown, in the polymer dispersed liquid crystal display device according to the third embodiment of the present invention, the polymer dispersed liquid crystal layer 330 is formed between the pair of substrates 300 and 310, and the polymer dispersed liquid crystal layer In 330, a dual frequency liquid crystal 340 and a die 350 are formed of PNLC continuously contained in a 3D polymer network 320 structure, and the pair of substrates 300 and 310 face each other. A pair of electrodes (not shown) is disposed on the substrate, and vertical alignment layers 360 and 370 are coated on the pair of electrodes. In this case, the dual frequency liquid crystal 340 and the die 350 are vertically arranged on the substrate by the vertical alignment layer, so that the dual frequency liquid crystal 340 and the die 350 are transparent. Transparency is poor because it is not perfectly vertical. Therefore, as shown in FIG. 6A, both the liquid crystals 340 and the die 350 that are not vertically aligned are made by applying a low frequency and positive permittivity of the dielectric anisotropy of the liquid crystal to make a perfect transparent state. Arrange in the direction perpendicular to. In order to create a dark state, as shown in FIG. 2B, a voltage is applied to the pair of electrodes and a high frequency is applied to make the dielectric anisotropy of the liquid crystal negative, so that the liquid crystal 340 and the die 350 are parallel to the substrate. Arrange in the direction of

On the other hand, the polymer dispersed liquid crystal layer (130. 230, 330) has a thickness of 2um to 100um.

In addition, the dies 150, 250, and 350 may be included in an amount of 0.1 wt% to 60 wt% based on the total weight of the dual frequency liquid crystals 140, 240, and 340.

The die may be a dichroic die that absorbs light of a specific wavelength, and in this case, the dichroic die may include at least one selected from an anthraquinone series, a phthalocyanine series, and an azo series.

100, 110, 200, 210, 300, 310: pair of substrates
120: mixture droplet mixed with liquid crystal and die
220,320: polymer network
130, 230, 330: polymer dispersed liquid crystal layer
140, 240, 340: liquid crystal
150, 250, 350: die

Claims (6)

With a pair of substrates:
A pair of electrode layers positioned on a rear surface of the pair of substrates facing each other;
A polymer dispersed liquid crystal display device comprising a polymer dispersed liquid crystal layer comprising a mixed phase of a polymer, a dual frequency liquid crystal, and a die between the pair of electrode layers. With a pair of substrates:
A pair of electrode layers positioned on a rear surface of the pair of substrates facing each other;
Placing vertical alignment layers on the rear surface of the pair of electrode layers;
A polymer dispersed liquid crystal display device comprising a polymer dispersed liquid crystal layer comprising a mixed phase of a polymer, a dual frequency liquid crystal, and a die between the vertical alignment layers. 3. The method according to claim 1 or 2,
The polymer dispersed liquid crystal display device has a thickness of 2 μm to 100 μm. 3. The method according to claim 1 or 2,
The die is a polymer dispersed liquid crystal display device, characterized in that the dichroic die that absorbs light of a specific wavelength. 3. The method according to claim 1 or 2,
The die is a polymer dispersed liquid crystal display device, characterized in that containing 0.1wt% to 60wt% based on the total weight of the dual frequency liquid crystal The method of claim 4, wherein
The dichroic die is a polymer dispersed liquid crystal display device comprising at least one selected from anthraquinone, phthalocyanine, and azo.
KR1020100005375A 2010-01-19 2010-01-19 Polymer dispersed liquid crystal display device KR20110085527A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707479A (en) * 2012-06-15 2012-10-03 深圳市华星光电技术有限公司 In-plane-switching mode liquid crystal display panel and preparation process and display thereof
US9207512B1 (en) 2014-05-15 2015-12-08 Samsung Display Co., Ltd. Method of manufacturing transparent display device using pre-tilted liquid crystal molecules
US20180321524A1 (en) * 2017-05-08 2018-11-08 Fenghua Li Polymer-dispersed liquid crystal shutter with fast switching capability
KR20210123497A (en) * 2020-04-03 2021-10-14 영남대학교 산학협력단 Smart glass and manufacturing method thereof, vehicle and building structure having same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102707479A (en) * 2012-06-15 2012-10-03 深圳市华星光电技术有限公司 In-plane-switching mode liquid crystal display panel and preparation process and display thereof
WO2013185383A1 (en) * 2012-06-15 2013-12-19 深圳市华星光电技术有限公司 In-plane-switching mode liquid crystal display panel and preparation process and display thereof
US9207512B1 (en) 2014-05-15 2015-12-08 Samsung Display Co., Ltd. Method of manufacturing transparent display device using pre-tilted liquid crystal molecules
US20180321524A1 (en) * 2017-05-08 2018-11-08 Fenghua Li Polymer-dispersed liquid crystal shutter with fast switching capability
KR20210123497A (en) * 2020-04-03 2021-10-14 영남대학교 산학협력단 Smart glass and manufacturing method thereof, vehicle and building structure having same

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