CN111552123A - Ultraviolet irradiation device for liquid crystal alignment and ultraviolet irradiation method thereof - Google Patents
Ultraviolet irradiation device for liquid crystal alignment and ultraviolet irradiation method thereof Download PDFInfo
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- CN111552123A CN111552123A CN202010447621.XA CN202010447621A CN111552123A CN 111552123 A CN111552123 A CN 111552123A CN 202010447621 A CN202010447621 A CN 202010447621A CN 111552123 A CN111552123 A CN 111552123A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims description 19
- 238000009281 ultraviolet germicidal irradiation Methods 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 239000000178 monomer Substances 0.000 abstract description 27
- 238000006757 chemical reactions by type Methods 0.000 abstract description 15
- 238000005286 illumination Methods 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 210000002858 crystal cell Anatomy 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
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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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
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- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
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- Liquid Crystal (AREA)
Abstract
The liquid crystal alignment ultraviolet irradiation device comprises a plurality of chambers, wherein each chamber comprises a bearing machine table and a plurality of ultraviolet light sources with at least two different wavelength bands, the ultraviolet light sources and the bearing machine tables are correspondingly arranged, and the ultraviolet light sources with different wavelength bands are mutually and independently driven. Through set up the ultraviolet source of different wavelength bands in the ultraviolet irradiation device that the liquid crystal is joined in marriage, open the ultraviolet source of different wavelength bands at the different irradiation period to thereby make the reaction type monomer of different wave bands in the liquid crystal receive illumination and take place the reaction, and then make the reaction type monomer of each wavelength band react completely, and then improve display panel's quality.
Description
Technical Field
The present disclosure relates to the field of liquid crystal display technologies, and in particular, to an ultraviolet irradiation apparatus for liquid crystal alignment and an ultraviolet irradiation method thereof.
Background
In the liquid crystal cell process of the PSVA (polymer stabilized vertical alignment) liquid crystal display technology, liquid crystal alignment needs to be performed on the upper substrate and the lower substrate. The liquid crystal contains a reactive monomer, the reactive monomer in the liquid crystal is reacted by ultraviolet irradiation on the substrate, the liquid crystal forms a pretilt angle under the synergistic action of voltage, but the reactive monomer still remains in the liquid crystal box and needs to be subjected to secondary ultraviolet irradiation to enable the reactive monomer to be completely reacted.
With the development of the PSVA technology, the response time required for the display panel is shorter and shorter, and the process optimization has reached the limit, so the skilled person improves the liquid crystal material, and adds many double bond structures to the liquid crystal material to obtain the ultra-fast response liquid crystal. The dominant wavelength of the light source of the present uv irradiation device for liquid crystal alignment in mass production is about 313nm, but the double bond structure is easily cracked by long-time illumination near 313nm wavelength, which results in poor reliability of the display panel.
In order to improve the defects, two kinds of wave band reaction type monomers which react near 313nm and near 365nm are added into the liquid crystal, the reaction type monomers which react at the wave band of 313nm can react under the initiation of the reaction type monomers near 365nm, but the combination does not completely react under the ultraviolet irradiation process with the wave length of 365nm, so that more reaction type monomers are remained after secondary ultraviolet light alignment.
Therefore, the existing ultraviolet irradiation apparatus for liquid crystal alignment needs to be improved.
Disclosure of Invention
The embodiment of the application provides an ultraviolet irradiation device for liquid crystal alignment and an ultraviolet irradiation method thereof, which are used for solving the technical problems that in the existing ultraviolet irradiation device for liquid crystal alignment, when secondary ultraviolet alignment is performed on a display panel, more reactive monomers in liquid crystal remain, the formation of a pretilt angle of the liquid crystal is influenced, and further the display quality of the display panel is influenced.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the embodiment of the application provides an ultraviolet irradiation device that liquid crystal is joined in marriage, including a plurality of cavities, the cavity is including bearing the platform and a plurality of ultraviolet sources of at least two kinds of different wavelength bands of bearing the weight of the display panel of treating joining in marriage, ultraviolet source with bear the corresponding setting of platform, different wavelength ultraviolet source mutually independent drive.
In at least one embodiment of the present application, the chamber includes a plurality of first light sources and a plurality of second light sources in different wavelength bands, and one of the second light sources is disposed corresponding to each of the first light sources.
In at least one embodiment of the present application, the first light source has a wavelength ranging from 280 to 340 nm, and the second light source has a wavelength ranging from 340 to 380 nm.
In at least one embodiment of the present application, the first light source has a wavelength of 313 nanometers and the second light source has a wavelength of 365 nanometers.
In at least one embodiment of the present application, a plurality of the ultraviolet light sources in the same wavelength band are driven by the same switch.
In at least one embodiment of the present application, a plurality of the chambers are arranged in a stack.
The embodiment of the present application further provides an ultraviolet irradiation method for liquid crystal alignment, including:
s10, providing an ultraviolet irradiation device for liquid crystal alignment, wherein the ultraviolet irradiation device comprises a plurality of chambers, each chamber comprises a bearing machine and a plurality of ultraviolet light sources with at least two different wavelength bands corresponding to the bearing machine, and the ultraviolet light sources with different wavelengths are driven independently;
s20, placing a plurality of display panels on the bearing machine tables of the plurality of chambers in a one-to-one correspondence manner;
and S30, turning on or off the ultraviolet light sources with different wavelength bands in different irradiation stages to irradiate the display panel.
In at least one embodiment of the present application, the chamber includes a plurality of first light sources and a plurality of second light sources in different wavelength bands, and one of the second light sources is disposed corresponding to each of the first light sources.
In at least one embodiment of the present application, the S30 includes:
s301, turning on the first light source and the second light source to irradiate the display panel within a first preset time;
s302, in a second preset time, the first light source is turned off, and the second light source is used for irradiating the display panel.
In at least one embodiment of the present application, the first light source has a wavelength ranging from 280 to 340 nm, and the second light source has a wavelength ranging from 340 to 380 nm; the first preset time is 0-30 minutes, and the second preset time is 50-120 minutes.
The invention has the beneficial effects that: through set up the ultraviolet source of different wavelength bands in the ultraviolet irradiation device that the liquid crystal is joined in marriage, open the ultraviolet source of different wavelength bands at the different irradiation period to thereby make the reaction type monomer of different wave bands in the liquid crystal receive illumination and take place the reaction, and then make the reaction type monomer of each wavelength band react completely, and then improve display panel's quality.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an ultraviolet irradiation apparatus for liquid crystal alignment according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating steps of an ultraviolet irradiation method for liquid crystal alignment according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
As shown in fig. 1, an embodiment of the present application provides an ultraviolet irradiation apparatus 100 for liquid crystal alignment, which includes a plurality of chambers 10, each of the chambers includes a supporting platform 13 and a plurality of ultraviolet light sources with at least two different wavelength bands, the supporting platform 13 is configured to support a display panel 200 to be aligned, and the ultraviolet light sources are disposed corresponding to the supporting platform 13.
In order to increase the response speed of the display panel, a double bond structure is generally added to the liquid crystal material, and the dominant wavelength of the light source of the ultraviolet irradiation device for liquid crystal alignment in the industry at present is around 313nm, but the double bond structure is easily cracked by long-time illumination around 313nm wavelength, which results in poor reliability of the display panel. For example, two kinds of band-reactive monomers reacting near 313nm and near 365nm are added into the liquid crystal, and the reactive monomer reacting near 313nm can react under the initiation of the reactive monomer near 365nm, but the combination does not completely react under the ultraviolet irradiation process with 365nm wavelength, resulting in more reactive monomers remaining after the secondary ultraviolet light alignment.
The technical problem that the above-mentioned reaction type monomer reaction does not completely lead to remaining can be solved to the embodiment of this application, the embodiment of this application sets up the ultraviolet light source of two at least different wavelength sections through the cavity 10 at the ultraviolet irradiation device 100 that the liquid crystal is joined in marriage, the time-sharing is carried out illumination to display panel 200, according to the reaction wavelength of the reaction type monomer in the liquid crystal, carry out the combination of the ultraviolet light source of different wavelengths in the reaction period of difference, thereby reach and to make the reaction type monomer reaction of different reaction wavelength complete, can make the double bond structure of liquid crystal avoid receiving long-time illumination easy schizolysis again, thereby improve display panel's display quality.
The ultraviolet light sources with different wavelength bands are driven independently, namely the ultraviolet light sources with different wavelength bands are controlled by different switches, so that the switching of different light sources is facilitated.
In one embodiment, a plurality of ultraviolet light sources in the same wavelength band can be driven by the same switch, so that the operation is convenient and quick.
In one embodiment, the plurality of ultraviolet light sources in the same wavelength band may also be driven in different regions, for example, the central region is controlled by the same switch, and the peripheral region is controlled by another switch, so that when performing ultraviolet illumination on display panels of different sizes, the ultraviolet light sources corresponding to the regions of the display panel to be illuminated may be turned on, and the ultraviolet light sources corresponding to the regions not to be illuminated may be turned off, thereby adapting to display panels of multiple specifications and saving production cost.
The ultraviolet light source can be a surface light source or a point light source, and is not limited herein.
Each wavelength band of the uv light source corresponds to another wavelength band of the uv light source, so that each wavelength band of the uv light source can uniformly irradiate the display panel 200.
A cooling system may be disposed in the carrier platform to cool the display panel 200. The cooling system can be a water cooling system or an air cooling system, and can also be a combination of the two.
In one embodiment, a plurality of the chambers may be stacked to reduce the space occupied by the device.
In one embodiment, a plurality of the chambers may also be arranged in a tiled (horizontal) arrangement, and the arrangement in a stack or in a tiled arrangement may be selected according to the design requirements of the actual device.
As shown in FIG. 1, in one embodiment, the chamber 10 includes two wavelength band UV light sources, a short wavelength band UV light source and a long wavelength band UV light source, with the two different wavelength band UV light sources being controlled by separate switch control systems. In the early production stage, both ultraviolet light sources are turned on for irradiation, and in the later production stage, only the ultraviolet light source with long wave band is turned on for irradiation.
Specifically, the chamber 10 may include a plurality of first light sources 11 and a plurality of second light sources 12 in different wavelength bands, and each of the first light sources 11 is provided with one of the second light sources 12.
In one embodiment, the wavelength range of the first light source 11 is 280-340 nm, and the wavelength range of the second light source 12 is 340-380 nm.
For example, the wavelength of the first light source 11 is 313nm, and the wavelength of the second light source 12 is 365 nm.
In actual production, the first light source 11 and the second light source 12 are turned on to irradiate the display panel 200 in the early stage of irradiation, and after a period of irradiation, the first light source 11 is turned off, and the second light source 12 is used to continue to irradiate the display panel 200. Therefore, cracking of a double-bond structure of the liquid crystal caused by long-time illumination of the first light source with the wavelength of 313 nanometers can be avoided, the monomers reacted in the 313 nanometer waveband can be reacted under the irradiation of the first light source 11, and the monomers reacted in the 365 wavelength waveband are further reacted under the irradiation of the second light source 12, so that the reaction type monomers are reacted completely, and the reaction type monomer residue after secondary ultraviolet light alignment is reduced.
In an embodiment, as shown in fig. 2, an application method of the ultraviolet irradiation apparatus 100 for liquid crystal alignment is provided, that is, an ultraviolet irradiation method for liquid crystal alignment includes:
s10, providing an ultraviolet irradiation device 100 for liquid crystal alignment, where the ultraviolet irradiation device 100 includes a plurality of chambers 10, each chamber 10 includes a carrier 13 and a plurality of ultraviolet light sources with at least two different wavelength bands corresponding to the carrier 13, and the ultraviolet light sources with different wavelengths are driven independently;
s20, placing a plurality of display panels on the bearing machine tables of the plurality of chambers in a one-to-one correspondence manner;
and S30, turning on or off the ultraviolet light sources with different wavelength bands in different irradiation stages to irradiate the display panel.
The structure of the ultraviolet irradiation apparatus 100 can refer to the description of any of the foregoing embodiments, and is not described herein again.
The ultraviolet light sources with two different wavelength bands are taken as an example for explanation, that is, the chamber 10 includes a plurality of first light sources 11 and a plurality of second light sources 12 with different wavelength bands, and each first light source 11 is provided with one second light source 12 correspondingly.
Specifically, the ultraviolet light irradiation process may include: s301, turning on the first light source 11 and the second light source 12 to illuminate the display panel 200 within a first preset time;
s302, in a second preset time, turning off the first light source 11, and illuminating the display panel 200 by using the second light source 12.
The wavelength range of the first light source is 280-340 nanometers, and the wavelength range of the second light source is 340-380 nanometers.
The first preset time is 0-30 minutes, and the first preset time cannot be too long, so that the double-bond structure of the liquid crystal is prevented from being broken due to long-time illumination.
The second preset time is 50-120 minutes, and the second preset time cannot be too short, so that incomplete reaction of reactive monomers in the liquid crystal is avoided.
The specific wavelength selection of the uv light sources of different wavelengths in the embodiments of the present application is determined by the properties of the liquid crystal, and only a single example is given here, but the wavelength selection of the uv light sources is not limited to this.
Through set up the ultraviolet source of different wavelength bands in the ultraviolet irradiation device that the liquid crystal is joined in marriage, open the ultraviolet source of different wavelength bands at the different irradiation period to thereby make the reaction type monomer of different wave bands in the liquid crystal receive illumination and take place the reaction, and then make the reaction type monomer of each wavelength band react completely, and then improve display panel's quality.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above detailed description is made on the crystal alignment ultraviolet irradiation apparatus and the ultraviolet irradiation method thereof provided in the embodiments of the present application, and the principles and embodiments of the present application are described herein by applying specific examples, and the description of the above embodiments is only used to help understanding the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. An ultraviolet irradiation apparatus for liquid crystal alignment, comprising a plurality of chambers, the chambers comprising:
the bearing machine platform bears the display panel to be aligned; and
the ultraviolet light sources with at least two different wavelength bands are arranged corresponding to the bearing machine platform, and the ultraviolet light sources with different wavelength bands are driven independently.
2. The UV irradiation apparatus for liquid crystal alignment according to claim 1, wherein the chamber comprises a plurality of first light sources and a plurality of second light sources of different wavelength bands, and one of the second light sources is disposed for each of the first light sources.
3. The UV irradiation apparatus for liquid crystal alignment according to claim 2, wherein the first light source has a wavelength of 280-340 nm, and the second light source has a wavelength of 340-380 nm.
4. The UV irradiation apparatus for liquid crystal alignment according to claim 3, wherein the first light source has a wavelength of 313nm and the second light source has a wavelength of 365 nm.
5. The UV irradiation apparatus for liquid crystal alignment according to claim 1, wherein a plurality of UV light sources in the same wavelength band are driven by the same switch.
6. The ultraviolet irradiation apparatus for liquid crystal alignment according to claim 1, wherein a plurality of the chambers are stacked.
7. An ultraviolet irradiation method for liquid crystal alignment, comprising:
s10, providing an ultraviolet irradiation device for liquid crystal alignment, wherein the ultraviolet irradiation device comprises a plurality of chambers, each chamber comprises a bearing machine and a plurality of ultraviolet light sources with at least two different wavelength bands corresponding to the bearing machine, and the ultraviolet light sources with different wavelengths are driven independently;
s20, placing a plurality of display panels on the bearing machine tables of the plurality of chambers in a one-to-one correspondence manner;
and S30, turning on or off the ultraviolet light sources with different wavelength bands in different irradiation stages to irradiate the display panel.
8. The UV irradiation method for liquid crystal alignment according to claim 7, wherein said chamber comprises a plurality of first light sources and a plurality of second light sources with different wavelength bands, and one of said second light sources is disposed for each of said first light sources.
9. The ultraviolet irradiation method for liquid crystal alignment according to claim 8, wherein said S30 includes:
s301, turning on the first light source and the second light source to irradiate the display panel within a first preset time;
s302, in a second preset time, the first light source is turned off, and the second light source is used for irradiating the display panel.
10. The method of claim 9, wherein the first light source has a wavelength of 280-340 nm, and the second light source has a wavelength of 340-380 nm; the first preset time is 0-30 minutes, and the second preset time is 50-120 minutes.
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Application publication date: 20200818 |