KR20140031670A - Liquid crystal modulator and method for manufaturing the same - Google Patents

Liquid crystal modulator and method for manufaturing the same Download PDF

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Publication number
KR20140031670A
KR20140031670A KR1020120098274A KR20120098274A KR20140031670A KR 20140031670 A KR20140031670 A KR 20140031670A KR 1020120098274 A KR1020120098274 A KR 1020120098274A KR 20120098274 A KR20120098274 A KR 20120098274A KR 20140031670 A KR20140031670 A KR 20140031670A
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KR
South Korea
Prior art keywords
liquid crystal
cholesteric
electrode
cholesteric liquid
modulator
Prior art date
Application number
KR1020120098274A
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Korean (ko)
Inventor
김재훈
Original Assignee
한양대학교 산학협력단
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Priority to KR1020120098274A priority Critical patent/KR20140031670A/en
Publication of KR20140031670A publication Critical patent/KR20140031670A/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
    • G02F1/1326—Liquid crystal optical waveguides or liquid crystal cells specially adapted for gating or modulating between optical waveguides
    • 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
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal

Abstract

A liquid crystal modulator according to an embodiment of the present invention includes a substrate, an electrode disposed on the first substrate, a liquid crystal layer disposed on the electrode, and an overcoat disposed on the liquid crystal layer, wherein the liquid crystal layer comprises a cholesteric liquid crystal and And a cholesteric liquid crystal is isolated by the polymer structure.

Description

Liquid crystal modulator and its manufacturing method {LIQUID CRYSTAL MODULATOR AND METHOD FOR MANUFATURING THE SAME}

The present invention relates to a liquid crystal modulator for inspecting a thin film transistor array panel and a method of manufacturing the same.

The liquid crystal display device is one of the most widely used flat panel display devices and is composed of two display panels having an electric field generating electrode such as a pixel electrode and a common electrode and a liquid crystal layer interposed therebetween.

A voltage is applied to the electric field generating electrode to generate an electric field in the liquid crystal layer, thereby determining the orientation of the liquid crystal molecules in the liquid crystal layer and controlling the polarization of the incident light to display an image.

The liquid crystal display device comprises a thin film transistor display plate and a common electrode display plate facing each other. A gate line for transmitting a gate signal and a data line for transmitting a data signal are formed on the thin film transistor display panel so as to intersect with each other. A thin film transistor connected to the gate line and the data line, and a pixel electrode connected to the thin film transistor are formed. A light shielding member, a color filter, a common electrode, and the like are formed on the common electrode display panel.

The thin film transistor array panel forms pixels in a minimum unit for displaying an image, and the thin film transistor and the electrode operate to display an image in color displayed in pixel units.

As such, in order to display an image, the thin film transistors and the electrodes constituting each pixel must be driven accurately.

In particular, it is important to inspect a thin film transistor array panel in which an electrical signal applied by using the electrical characteristics of the thin film transistor is converted into an image signal to determine whether there is a defect.

In the inspection of the thin film transistor array panel, the liquid crystal modulator is disposed on the thin film transistor array panel and a voltage is applied to the pixel electrode of the thin film transistor array panel and the electrode of the liquid crystal modulator to measure optical characteristics of the liquid crystal modulator and analyze the same to detect pixel defects.

In the inspection of such a thin film transistor array panel, there is a problem in that a luminance transition phenomenon occurs in which a luminance change occurs according to an applied voltage at an interface between a region where a voltage is applied and a region where a voltage is not applied.

The problem to be solved by the present invention is to minimize the brightness transition between the pixels when the liquid crystal modulator inspecting the thin film transistor array panel, when the thin film transistor array panel is on / off.

Problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A liquid crystal modulator according to an embodiment of the present invention includes a substrate, an electrode disposed on the first substrate, a liquid crystal layer disposed on the electrode, and an overcoat disposed on the liquid crystal layer, wherein the liquid crystal layer comprises a cholesteric liquid crystal and And a cholesteric liquid crystal is isolated by the polymer structure.

The cholesteric liquid crystal may be columnar.

The cholesteric liquid crystal may have a reflection characteristic of 20% to 45% of incident light.

The cholesteric liquid crystal may be droplet shaped.

The cholesteric liquid crystal may have a reflection characteristic of 10% to 20% of incident light.

The electrode may receive a common voltage.

The overcoat may be a polymer film having a thickness of 20 μm to 30 μm.

The spacer may further include a spacer positioned between the overcoat and the electrode.

According to one or more exemplary embodiments, a method of manufacturing a liquid crystal modulator includes forming an electrode on a substrate, forming a liquid crystal mixture in which a cholesteric liquid crystal and a photocurable polymer material are mixed on the electrode, and forming an overcoat on the liquid crystal mixture. And curing the photocurable polymer material by irradiating ultraviolet rays to the liquid crystal mixture to form a polymer structure, wherein the cholesteric liquid crystal and the photocurable polymer material are in a ratio of 40:60 to 80:20. It is mixed.

Cholesteric liquid crystals can be isolated by polymer structures.

The method may further include forming a spacer positioned between the overcoat and the electrode.

According to another embodiment of the present invention, a liquid crystal modulator includes a substrate, an electrode disposed on the first substrate, and a liquid crystal layer disposed on the electrode, the liquid crystal layer including a plurality of cholesteric capsules, and a cholesteric In the capsule, a polymer film surrounds the cholesteric liquid crystal.

Method of manufacturing a liquid crystal modulator according to another embodiment of the present invention is to form a cholesteric capsule by mixing a cholesteric liquid crystal, a polymer material and a solvent, forming an electrode on a substrate, a cholesteric capsule on the electrode and And uniformly applying the solvent, and removing the solvent, wherein the cholesteric capsule has a polymer film surrounding the cholesteric liquid crystal.

The uniform application of the cholesteric capsule and solvent may be performed by a doctor blade process.

According to the exemplary embodiment of the present invention, the liquid crystal layer of the liquid crystal modulator may be formed in a structure in which the cholesteric liquid crystal is isolated by the polymer structure, thereby minimizing the brightness transition between pixels when the thin film transistor array panel is inspected. .

In addition, since the cholesteric liquid crystal has reflective characteristics, the reflective film can be removed.

1 is a cross-sectional view of a liquid crystal modulator according to an embodiment of the present invention.
2 is a cross-sectional view of a liquid crystal modulator according to another embodiment of the present invention.
3 is a view showing a method of manufacturing a liquid crystal modulator according to an embodiment of the present invention.
4 is a cross-sectional view of a liquid crystal modulator according to another embodiment of the present invention.
5 is a cross-sectional view of the cholesteric capsule of FIG.
6 to 8 are diagrams illustrating a method of manufacturing the liquid crystal modulator according to FIG. 4.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but only the embodiments to complete the disclosure of the present invention, the scope of the invention to those skilled in the art to which the present invention pertains. The invention is provided by way of example, and the invention is defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

1 is a cross-sectional view of a liquid crystal modulator according to an embodiment of the present invention.

Referring to FIG. 1, the liquid crystal modulator according to the present exemplary embodiment may include a substrate 110, an electrode 120 positioned on the substrate 110, an overcoat 150 facing the electrode 120, and an electrode 120. The liquid crystal layer 140 is disposed between the overcoat 150. In addition, a spacer 130 for maintaining a gap between the electrode 120 and the overcoat 150 is disposed between the electrode 120 and the overcoat 150.

The substrate 110 is an insulating substrate made of a material such as transparent glass, and the electrode 120 is made of a transparent conductor such as ITO or IZO. The common voltage is applied to the electrode 120. The electrode 120 forms an electric field facing the pixel electrode of the thin film transistor array panel to be inspected. Light is incident on the liquid crystal layer 140 to the external light source, and the light incident on the liquid crystal layer 140 is reflected again. The reflected light is converted into an electrical signal and output, and the thin film transistor to be inspected through the output electrical signal. The defective state of the pixel electrode of the display panel is determined.

The liquid crystal layer 140 includes a polymer structure 141 and a liquid crystal material 142. The liquid crystal material 142 is made of cholesteric liquid crystal and is isolated by the polymer structure 141, and has a columnar shape.

The cholesteric liquid crystal is formed by containing a chiral dopant in the liquid crystal molecules. When the chiral dopant is contained in the liquid crystal material, a cholesteric liquid crystal having a helical twisted cholesteric phase is formed. The cholesteric liquid crystal repeats the twisting of molecules at regular intervals, and the repeated length is called a pitch, and has a property of selectively reflecting incident light by the repeated structure.

In the present embodiment, the liquid crystal material 142 exhibits a reflection wavelength of 550 nm, and the liquid crystal material 142 has a reflection characteristic of 20% to 45%. As such, the liquid crystal material 142 may have reflective characteristics, thereby removing the reflective film required for the conventional liquid crystal modulator.

In addition, since the liquid crystal layer 142 of the cholesteric liquid crystal layer 140 is formed of an isolated structure by the polymer structure 141, the liquid crystal layer 140 may be interposed between the pixels during the inspection of the thin film transistor array panel to be inspected. It is possible to minimize the brightness transition phenomenon.

The overcoat 150 covers the liquid crystal layer 140 and is a polymer film having a thickness of 20 μm to 30 μm.

The spacer 130 maintains a constant gap between the electrode 120 and the overcoat 150.

2 is a cross-sectional view of a liquid crystal modulator according to another embodiment of the present invention.

The structure of the liquid crystal modulator of the embodiment according to FIG. 2 differs only in the shape of the liquid crystal material 142 from the structure of the liquid crystal modulator according to FIG. 1, and the rest of the structure is the same. The description of the same structure is abbreviate | omitted.

The liquid crystal material 142 is made of a cholesteric liquid crystal, and has a structure isolated by the polymer structure 141, and the shape of the liquid crystal material 142 is a drop shape. In the present embodiment, the liquid crystal material 142 has a reflection wavelength of 550 nm and has a reflection characteristic of 10% to 20%.

Next, a method of manufacturing a liquid crystal modulator according to an embodiment of the present invention will be described in detail with reference to FIGS. 3, 1, and 2.

3 is a view showing a method of manufacturing a liquid crystal modulator according to an embodiment of the present invention.

Referring to FIG. 3, the electrode 120 is formed on the substrate 110, and the spacer 130 and the liquid crystal mixture 140a are formed on the electrode 120. Here, the cholesteric liquid crystal and the photocurable polymer material are mixed in the liquid crystal mixture 140a in a ratio of 40:60 to 80:20.

After the overcoat 150 is formed on the spacer 130 and the liquid crystal mixture 140a, the photocurable polymer is cured by irradiating ultraviolet light to the liquid crystal mixture 140a, as shown in FIGS. 1 and 2. 141). When the ultraviolet light is irradiated onto the liquid crystal mixture 140a, isotropic phase separation proceeds between the cholesteric liquid crystal and the photocurable polymer material. At this time, the photocurable polymer material is cured by ultraviolet light to form the polymer structure 141. The cholesteric liquid crystal is a liquid crystal material 142 having a structure isolated by the polymer structure 141.

In this case, the liquid crystal material 142 may be formed to have a columnar shape or a drop shape by adjusting the intensity of ultraviolet rays.

4 and 5, a liquid crystal modulator according to another exemplary embodiment of the present invention will be described in detail.

4 is a cross-sectional view of a liquid crystal modulator according to another exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view of the cholesteric capsule of FIG. 4.

4 and 5, the liquid crystal modulator according to the present exemplary embodiment includes an electrode 120 positioned on the substrate 110 and a liquid crystal layer 140 positioned on the electrode 120.

Here, the configuration of the substrate 110 and the electrode 120 is the same as the liquid crystal modulator of FIG.

The liquid crystal layer 140 includes a plurality of cholesteric capsules 145.

The cholesteric capsule 145 surrounds the cholesteric liquid crystal 147 with the polymer film 146.

As described above, in the present embodiment, since the cholesteric capsule 145 surrounding the cholesteric liquid crystal 147 is surrounded by the polymer film 146, the components covering the liquid crystal layer 140 can be removed.

In addition, since the cholesteric capsule 145 can be formed to have a uniform size in a large area, it is advantageous for inspecting a large area thin film transistor array panel.

Next, the method of manufacturing the liquid crystal modulator of FIG. 4 will be described in detail with reference to FIGS. 6 to 8.

6 to 8 are diagrams illustrating a method of manufacturing the liquid crystal modulator according to FIG. 4.

6 and 7, the cholesteric liquid crystal 147, the polymer material 146a, and the solvent 148 are prepared, and then the cholesteric liquid crystal 147 and the polymer material 146a are mixed with each other. The cholesteric capsule 145 surrounding the sterile liquid crystal 147 with the polymer film 146 is formed. Here, the polymer material 146a may use polyvinyl alcohol (PVA).

As shown in FIG. 8, the cholesteric capsule 145 and the solvent 148 are uniformly applied on the electrode 120 by a doctor blade process, and then, as shown in FIG. 4, the solvent 148 is removed. As a result, the cholesteric capsule 145 is uniformly coated on the electrode 120 to form the liquid crystal layer 140.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. It is therefore to be understood that the above-described embodiments are illustrative and non-restrictive in every respect.

110: substrate 120: electrode
130: spacer 140: liquid crystal layer
141: polymer structure 142: liquid crystal material
145: cholesteric capsule 146: polymer film
147: cholesteric liquid crystal 150: overcoat

Claims (19)

Board,
An electrode disposed on the first substrate,
A liquid crystal layer disposed on the electrode, and
An overcoat disposed on the liquid crystal layer,
The liquid crystal layer includes a cholesteric liquid crystal and a polymer structure,
And the cholesteric liquid crystal is isolated by the polymer structure. In claim 1,
The cholesteric liquid crystal is a columnar liquid crystal modulator. 3. The method of claim 2,
The cholesteric liquid crystal has a reflection characteristic of 20% to 45% of the incident light. In claim 1,
The cholesteric liquid crystal is a liquid crystal modulator of a drop shape. 5. The method of claim 4,
The cholesteric liquid crystal has a reflection characteristic of 10% to 20% of the incident light. The method according to claim 2 or 4,
And the electrode receives a common voltage. In claim 1,
The overcoat is a liquid crystal modulator of 20㎛ to 30㎛ thick polymer film. 8. The method of claim 7,
And a spacer disposed between the overcoat and the electrode. Forming an electrode on the substrate,
Forming a liquid crystal mixture in which the cholesteric liquid crystal and the photocurable polymer material are mixed on the electrode,
Forming an overcoat on the liquid crystal mixture, and
Irradiating the liquid crystal mixture with ultraviolet rays to cure the photocurable polymer material to form a polymer structure,
The cholesteric liquid crystal and the photocurable polymer material are mixed in the liquid crystal mixture in a ratio of 40:60 to 80:20. The method of claim 9,
And the cholesteric liquid crystal is isolated by the polymer structure. 11. The method of claim 10,
The cholesteric liquid crystal is a columnar liquid crystal modulator manufacturing method. 12. The method of claim 11,
The cholesteric liquid crystal has a reflection characteristic of 20% to 45% of the incident light. 11. The method of claim 10,
The cholesteric liquid crystal is a drop-shaped liquid crystal modulator manufacturing method. The method of claim 13,
The cholesteric liquid crystal has a reflection characteristic of 10% to 20% of the incident light. The method of claim 9,
And forming a spacer positioned between the overcoat and the electrode. Board,
An electrode disposed on the first substrate, and
A liquid crystal layer disposed on the electrode,
The liquid crystal layer includes a plurality of cholesteric capsules,
The cholesteric capsule is a liquid crystal modulator in which a polymer film surrounds the cholesteric liquid crystal. 17. The method of claim 16,
And the electrode receives a common voltage. Mixing the cholesteric liquid crystal, the polymer material and the solvent to form a cholesteric capsule,
Forming an electrode on the substrate,
Uniformly applying the cholesteric capsule and the solvent on the electrode, and
Removing the solvent;
The cholesteric capsule is a method of manufacturing a liquid crystal modulator in which a polymer film surrounds the cholesteric liquid crystal. The method of claim 18,
Uniformly applying the cholesteric capsule and the solvent is a method of manufacturing a liquid crystal modulator to perform a doctor blade process.
KR1020120098274A 2012-09-05 2012-09-05 Liquid crystal modulator and method for manufaturing the same KR20140031670A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9429779B2 (en) 2014-08-19 2016-08-30 Samsung Electronics Co., Ltd. Electro-optic modulator including composite materials and testing apparatus including the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9429779B2 (en) 2014-08-19 2016-08-30 Samsung Electronics Co., Ltd. Electro-optic modulator including composite materials and testing apparatus including the same

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