KR20160116502A - Color switchable photo-luminescent liquid crystal composition, liquid crystal device using the same and method for manufacturing thereof - Google Patents
Color switchable photo-luminescent liquid crystal composition, liquid crystal device using the same and method for manufacturing thereof Download PDFInfo
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- KR20160116502A KR20160116502A KR1020150044308A KR20150044308A KR20160116502A KR 20160116502 A KR20160116502 A KR 20160116502A KR 1020150044308 A KR1020150044308 A KR 1020150044308A KR 20150044308 A KR20150044308 A KR 20150044308A KR 20160116502 A KR20160116502 A KR 20160116502A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/06—Luminescent, e.g. electroluminescent, chemiluminescent materials containing organic luminescent materials
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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
Abstract
The present invention relates to a light emitting liquid crystal composition capable of color switching, a liquid crystal display using the same, and a method of manufacturing the same. More particularly, the present invention relates to a light emitting liquid crystal composition capable of implementing color switching by mixing biomolecules having light emitting properties , A liquid crystal display device and a manufacturing method thereof.
According to the present invention, by providing a liquid crystal composition using a biomolecule having luminescence properties, it is possible to realize excellent optical characteristics and electro-optical characteristics even without a color filter layer included in a conventional liquid crystal display device. More specifically, according to the present invention, it is possible to realize a display characteristic capable of color switching without using a color filter layer.
Description
The present invention relates to a light emitting liquid crystal composition, a liquid crystal display using the same, and a method of manufacturing the same. More particularly, the present invention relates to a light emitting liquid crystal composition capable of realizing color switching by mixing biomolecules having a light emitting property in a liquid crystal, And a manufacturing method thereof.
2. Description of the Related Art A liquid crystal display (LCD) is composed of a liquid crystal display panel that displays an image using light transmittance of a liquid crystal and a backlight assembly that provides light. The liquid crystal display panel generally includes a TFT array substrate, a color filter layer substrate facing the array substrate, and a liquid crystal layer interposed between the array substrate and the color filter layer substrate. When an electric field is applied to the liquid crystal layer, the arrangement of the liquid crystal molecules changes according to an electric field formed thereby, and a phase difference of incident light passing through the liquid crystal layer is generated, and light is transmitted to display an image.
In general, light passing through the liquid crystal layer passes through the color filter layer and exhibits a specific color. A color filter layer made of a dye is usually formed separately.
However, in the process of forming the color filter layer, a separate thin film forming step is required, and the thin film is subjected to a multi-step process at the time of sintering, which is complicated and takes a long time. Another problem is that the transmittance is reduced due to the separate color filter layer.
In order to solve the above-mentioned problems, the present invention provides a light emitting liquid crystal composition capable of color switching, which can realize a color display characteristic without a color filter layer included in a conventional liquid crystal display device. The present invention also provides a liquid crystal display device using the liquid crystal composition and a method of manufacturing the same.
The present invention provides a light-emitting liquid crystal composition capable of color switching, comprising a biomolecule capable of emitting light and a liquid crystal and comprising 0.01 to 10 parts by weight of biomolecules per 100 parts by weight of the liquid crystal. And more preferably 0.1 to 3 parts by weight of biomolecules per 100 parts by weight of the liquid crystal.
When the amount of the organic molecules is less than 0.01 part by weight, the color characteristics are deteriorated. When the amount of the organic molecules is more than 10 parts by weight, biomolecules may not be dissolved in the liquid crystals, resulting in phase separation.
Also, when the biomolecules are mixed in the amount of 0.1 to 3 parts by weight, the color reproduction performance and the dispersion property of the biomolecules in the liquid crystal are optimized, and the color display characteristic and the black characteristic are excellent.
The biomolecule may include one or more selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
The liquid crystal composition can realize color switching by light in the visible light and ultraviolet light regions. Specifically, in the case of a liquid crystal composition containing chlorophyll a, it may be green by visible light, red by light in the ultraviolet region, yellow in visible light in case of kucumin, green in ultraviolet light, blue in visible light of anthocyanin, Green in ultraviolet light, red in visible light in capsaicin, and red in ultraviolet light.
Also, the present invention provides a method for manufacturing a light-emitting liquid crystal composition capable of color switching, which comprises adding 0.01 to 10 parts by weight of biomolecules capable of emitting light to 100 parts by weight of liquid crystal and stirring at 60 to 100 ° C for 5 to 20 minutes do. Lt; RTI ID = 0.0 > 70 C < / RTI > for 10 minutes. When stirring is performed in the above range, the biomolecules are uniformly dispersed in the liquid crystal, thereby exhibiting excellent black characteristics without defects in light leakage.
The biomolecules include one or more selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin. The liquid crystal composition may exhibit green light by visible light and red light by ultraviolet light.
The present invention also provides a TFT array substrate comprising: a TFT array substrate; A common electrode substrate; And a light-emitting liquid crystal layer interposed between the array substrate and the common electrode substrate, wherein the light-emitting liquid crystal layer comprises biomolecules capable of emitting light. A possible light emitting liquid crystal display device is provided.
The liquid crystal display device may not include a color filter layer.
The biomolecule may include one or more selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
The biomolecule may be contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal, more preferably 0.1 to 3 parts by weight based on 100 parts by weight of the liquid crystal.
The liquid crystal display device can realize color switching by light in the visible light region and the ultraviolet region (see FIG. 1). Specifically, when it is composed of chlorophyll a, it can show green color by visible light and red color by light in ultraviolet region. In case of curcumin, yellow in visible light and green in ultraviolet light, blue in visible light of anthocyanin, Green in ultraviolet light, red in visible light in capsaicin, and red in ultraviolet light.
The present invention also provides a TFT array substrate comprising: a TFT array substrate; A common electrode substrate; And a light emitting liquid crystal layer between the array substrate and the common electrode substrate, the method comprising: preparing a mixture by adding biomolecules capable of emitting light to a liquid crystal; Dropping the mixture on one surface of at least one of the array substrate and the common electrode substrate; Attaching the two substrates such that the mixture is positioned between the array substrate and the common electrode substrate; And a step of heat-treating the bonded substrate and cooling the substrate to room temperature.
The biomolecule may include one or more selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
The biomolecule may be added in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal, and more preferably 0.1 to 3 parts by weight based on 100 parts by weight of the liquid crystal.
The cementation may be performed by a sealant.
The heat treatment may be performed at a temperature of 80 to 120 DEG C for 40 to 80 minutes. More preferably at 100 < 0 > C for 60 minutes. In the above range, the liquid crystal molecules can be uniformly aligned in the display device, and the sealant in the substrate can be firmly adhered.
The liquid crystal display device can implement color switching by light in the visible light region and the ultraviolet region. Specifically, when it is composed of chlorophyll a, it can show green color by visible light and red color by light in ultraviolet region. In case of curcumin, yellow in visible light and green in ultraviolet light, blue in visible light of anthocyanin, Green in ultraviolet light, red in visible light in capsaicin, and red in ultraviolet light.
According to the present invention, by providing a liquid crystal composition using a biomolecule having luminescence properties, it is possible to realize excellent optical characteristics and electro-optical characteristics even without a color filter layer included in a conventional liquid crystal display device. More specifically, according to the present invention, it is possible to realize a display characteristic capable of color switching without a color filter layer, thereby realizing an ultra-thin display having a thinner panel thickness compared to conventional displays, and displaying color characteristics by a simple doping method without complicated photolithography This can be advantageous in that it can realize panel cost reduction.
1 is a schematic view showing color display characteristics of a liquid crystal display device according to an embodiment of the present invention.
2 is a graph showing the optical characteristics of the liquid crystal display device according to the embodiment in terms of spectrum in visible light.
3 is a graph showing the luminescence characteristics of the liquid crystal display device according to the embodiment in terms of the luminescence spectrum in the light in the ultraviolet region.
4 is a graph showing a transmittance curve according to voltage of the liquid crystal display device according to the embodiment and the comparative example.
5 is a graph showing the results of measurement of the liquid crystal reaction rate of the liquid crystal display device according to the example and the comparative example.
Hereinafter, the present invention will be described in detail by way of examples. The objects, features and advantages of the present invention will be readily understood through the following drawings and examples. The present invention is not limited to the drawings and embodiments described herein, but may be embodied in other forms. The drawings and embodiments are provided so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the scope of the present invention should not be limited by the following drawings and examples.
Referring to FIG. 1, a
Example: Fabrication of a light emitting liquid crystal display device
In the first step, a mixture of chlorophyll a and liquid crystal was prepared. Specifically, about 1.5 parts by weight of chlorophyll a was added to 100 parts by weight of a host liquid crystal having a dielectric anisotropy (DELTA epsilon) of -3.3 (having a refractive index anisotropy (DELTA n) of 0.101 and a phase transition temperature Tni of 75 DEG C) Lt; 0 > C for about 10 minutes to completely dissolve and mix chlorophyll-a in the host liquid crystal.
As a second step, a liquid crystal display was prepared using chlorophyll-a and a liquid crystal mixture. Specifically, a PI alignment film is coated on a lower TFT array substrate having a pixel electrode (ITO) or an upper common electrode substrate having a common electrode (common ITO), then a mixture of chlorophyll-a and liquid crystal is evenly dropped, sealant. After the cementation, the liquid crystal display cell was heat-treated in a high-temperature oven at 100 ° C for about 1 hour and then cooled to room temperature to produce a light-emitting liquid crystal display device that displays green light by visible light and red light by ultraviolet light 1).
Comparative Example
The conventional PI alignment film was coated on the lower TFT array substrate having the pixel electrode (ITO) or the upper common electrode substrate having the common electrode (common ITO), the liquid crystal was evenly dropped, and the two substrates were bonded together using a sealant Respectively. After the cementation, the liquid crystal display cell was heat-treated in a high-temperature oven at a temperature of 100 ° C for about 1 hour and then cooled to room temperature to produce a liquid crystal display device.
Experimental Example 1: Analysis of optical characteristics and luminescence characteristics of a liquid crystal display
The optical characteristics of the liquid crystal display device were analyzed and shown in FIG. 2, and the emission characteristics were analyzed and shown in FIG.
The optical and luminescent characteristics were analyzed using visible and ultraviolet light, respectively. Specifically, optical characteristics were measured using an ultraviolet-visible spectrophotometer (UV-vis spectroscopy, S-3100, Sinco) at room temperature and emission characteristics were measured using a fluorescence spectrometer (FS-2, Scinco) And analyzed through spectra measured at 300 to 750 nm and at 400 to 800 nm. 2 is a graph showing the results of the absorption spectrum. In Fig. 2, "Extracted chlorophyll" is a spectrum showing luminescence characteristics for chlorophyll extracted from plants and the like. For comparison with chlorophyll doping liquid crystals.
In the case of LC doped with chlorophyll according to the example, it was confirmed that the green color was absorbed by visible light except for the wavelength range of 500 to 600 nm. 3 is a graph showing the photoluminescence spectrum. LC cell doped with chlorophyll " refers to a liquid crystal display device to which a light emitting liquid crystal mixture is applied. &Quot; LC cell doped with chlorophyll "refers to a doped light emitting liquid crystal mixture, A red spectrum having a main peak of 650 to 750 nm having the highest luminescence intensity was confirmed.
Experimental Example 2: Electro-optical characteristic analysis of liquid crystal display
(JDSU, 1135P), a photodetector (EOT, ET-2000), an oscilloscope (Tektronix, TBS1062), and a function generator (Agilent, 33210A) were used to analyze the electro- The voltage-transmittance curve according to the voltage was measured using an electro-optical characteristic measurement system, and the results are shown in FIG. As shown in FIG. 4, the liquid crystal display according to the embodiment exhibits a V-T characteristic similar to that of the conventional liquid crystal display (comparative example), and it is confirmed that gray scale can be expressed according to the voltage.
The liquid crystal reaction time (response time) of the liquid crystal display was measured and the results are shown in FIG. The reaction rate was evaluated by analyzing the change of the transmittance in real time using an oscilloscope while alternately applying AC 7.5 V and AC 0.0 V to the manufactured liquid crystal display device. As a result of the experiment, the rising time (T on ) and the falling time (Toff) of the conventional liquid crystal display device (comparative example) were 16 ms and 6 ms, respectively. It is confirmed that the liquid crystal device can realize a high speed liquid crystal reaction speed equal to that of the conventional liquid crystal device, with a rising time of 25 ms and a polling time of 4 ms.
100: liquid crystal display
110: TFT array substrate
120: common electrode substrate
130: Light-emitting liquid crystal layer
Claims (15)
0.01 to 10 parts by weight of biomolecules per 100 parts by weight of the liquid crystal,
Color switching.
Wherein the biomolecule comprises at least one selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
The biomolecule is chlorophyll a,
Wherein the liquid crystal composition exhibits green color by visible light and red color by light in the ultraviolet region.
Wherein the biomolecule comprises at least one selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
The biomolecule is chlorophyll a,
Wherein the liquid crystal composition exhibits green color by visible light and red color by light in the ultraviolet region.
A common electrode substrate; And
And a light emission liquid crystal layer interposed between the array substrate and the common electrode substrate,
Wherein the light emitting liquid crystal layer comprises biomolecules capable of emitting light.
Wherein the biomolecule comprises at least one selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
Wherein the biomolecule is contained in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal.
The biomolecule is chlorophyll a,
Wherein the liquid crystal display device is capable of color switching, characterized in that the liquid crystal display device exhibits green color by visible light and red color by light in the ultraviolet region.
A common electrode substrate; And
And a light emitting liquid crystal layer between the array substrate and the common electrode substrate,
Adding a biomolecule capable of emitting light to the liquid crystal to prepare a mixture;
Dropping the mixture on one surface of at least one of the array substrate and the common electrode substrate;
Attaching the two substrates such that the mixture is positioned between the array substrate and the common electrode substrate; And
And heat-treating the bonded substrate and cooling the bonded substrate to room temperature.
Wherein the biomolecule includes at least one selected from the group consisting of chlorophyll a, curcumin, anthocyanin, and capsaicin.
Wherein the biomolecule is added in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal.
Wherein the heat treatment is performed at a temperature of 80 to 120 DEG C for 40 to 80 minutes.
The biomolecule is chlorophyll a,
Wherein the liquid crystal display device is capable of color switching, characterized in that the liquid crystal display device displays green by visible light and red color by light in the ultraviolet region.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085706A (en) * | 2018-07-23 | 2018-12-25 | 华南师范大学 | A kind of photoresponse device based on chlorophyll doping |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101110071B1 (en) | 2005-04-29 | 2012-02-24 | 삼성전자주식회사 | Photo-Luminescenct Liquid Crystal Display |
| KR101183571B1 (en) | 2006-07-06 | 2012-09-19 | 인터매틱스 코포레이션 | Photo-luminescence color liquid crystal display |
| KR101469494B1 (en) | 2013-04-26 | 2014-12-08 | 동국대학교 산학협력단 | Polymer dispersed liquid crystal composition comprising photoluminescent and process for preparing the same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101110071B1 (en) | 2005-04-29 | 2012-02-24 | 삼성전자주식회사 | Photo-Luminescenct Liquid Crystal Display |
| KR101183571B1 (en) | 2006-07-06 | 2012-09-19 | 인터매틱스 코포레이션 | Photo-luminescence color liquid crystal display |
| KR101469494B1 (en) | 2013-04-26 | 2014-12-08 | 동국대학교 산학협력단 | Polymer dispersed liquid crystal composition comprising photoluminescent and process for preparing the same |
Non-Patent Citations (2)
| Title |
|---|
| D.FRACKOWIAK 외 3, SPERCTRAL PROPERTIES OF CHLOROPHYLL a IN LIQUID CRYSTAL, Biophysical Chemistry, Vol.6, pp.369-377(1977) * |
| Yen Hsun Su 외 5, Influence of surface plasmon resonance on the emission intermittency of photoluminescence from gold nano-sea-urchins, Nanoscale, Vol.2, pp.2639~3646(2010) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085706A (en) * | 2018-07-23 | 2018-12-25 | 华南师范大学 | A kind of photoresponse device based on chlorophyll doping |
| CN109085706B (en) * | 2018-07-23 | 2021-12-14 | 华南师范大学 | Light response device based on chlorophyll doping |
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