CN105467636A - Light control film, preparation method of light control film and vehicle-mounted display screen - Google Patents
Light control film, preparation method of light control film and vehicle-mounted display screen Download PDFInfo
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- CN105467636A CN105467636A CN201610088064.0A CN201610088064A CN105467636A CN 105467636 A CN105467636 A CN 105467636A CN 201610088064 A CN201610088064 A CN 201610088064A CN 105467636 A CN105467636 A CN 105467636A
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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
- G02F1/1313—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 specially adapted for a particular application
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- 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
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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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
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Geometry (AREA)
Abstract
The invention discloses a light control film, a preparation method of the light control film and a vehicle-mounted display screen. The light control film comprises a substrate, an alignment film and a liquid crystal layer containing a liquid crystal polymer capable of being polymerized under ultraviolet light. The liquid crystal layer is formed by at least one columnar convex lens structure, so that through the convex lens structures of the liquid crystal layer, the exiting angle of light entering from one side of the substrate is limited within a certain range after the light passes through the liquid crystal layer, and the transmittance of the light is not influenced; meanwhile, the thickness is small and can reach 2 micrometers to 5 micrometers generally, and the thickness is about 1/100 that of an existing light control film, so that the light control film is lighter.
Description
Technical field
The present invention relates to optical film technology field, espespecially a kind of light controlling film, its preparation method and vehicle-mounted display screen.
Background technology
Automobile has become the main tool of the daily traffic of the mankind, in order to prevent when driving at night, the part emergent light of vehicle-carrying display screen projects on windshield, causes interference to the sight line of driver, and vehicle-carrying display screen is all generally utilize light controlling film to control the emergent light direction of display screen.
Vehicle-carrying display screen is the main light controlling film comprising common display panel and be positioned at display panel light emission side generally, the structure of existing light controlling film 01 as shown in Figure 1, mainly comprises the first polyester being positioned at display panel 02 light emission side successively thin (PET) film 011 and the shutter 012 of multiple black flaky blinds compositions of spaced set and the second PET film 013.By the emergent light of display panel 02 when through shutter 012, the angle of emergent light can narrow, thus can prevent emergent light from projecting to windshield and disturbing pilot's line of vision.But the core of the control light of above-mentioned light controlling film utilizes shutter 012 to carry out shading realization, when the emergent light angular range controlled is at about 60 °, the highest of transmitance has an appointment about 80%; Reduce to use shooting angle scope, transmitance can further reduce.And due to the restriction of manufacture craft and emergent light angle, this light controlling film integral thickness reaches 400um ~ 500um, and thickness is thicker, and vehicle-carrying display screen entirety can be made thicker, and not light.
Summary of the invention
In view of this, embodiments provide a kind of light controlling film, its preparation method and vehicle-mounted display screen, have that transmittance is low, thickness is thick and not light shortcoming in order to solve existing light controlling film.
Therefore, a kind of light controlling film that the embodiment of the present invention provides, comprising: underlay substrate, and being positioned at alignment films on described underlay substrate successively and including can the liquid crystal layer of liquid crystal polymer of uv photopolymerization; Wherein,
Described liquid crystal layer is the convex lens structures of at least one column.
Preferably, in the above-mentioned light controlling film that the embodiment of the present invention provides, also comprise the tack coat being positioned at described underlay substrate described liquid crystal layer side dorsad.
Preferably, in the above-mentioned light controlling film that the embodiment of the present invention provides, the protective seam covering described liquid crystal layer is also comprised.
Preferably, in the above-mentioned light controlling film that the embodiment of the present invention provides, also comprise: the polarisation sublayer between described underlay substrate and described tack coat.
Correspondingly, the embodiment of the present invention additionally provides a kind of vehicle-mounted display screen, comprises display panel, also comprises any one light controlling film above-mentioned that the embodiment of the present invention that is positioned at described display panel light emission side provides; Wherein,
The underlay substrate of described light controlling film is positioned near described display panel side.
Correspondingly, the embodiment of the present invention additionally provides a kind of preparation method of light controlling film, comprising:
Underlay substrate forms alignment films, and carries out drying process;
Orientation process is adopted to form orientation slots in described alignment films;
In the alignment films being formed with described orientation slots coating containing can the liquid crystal polymer of uv photopolymerization to form liquid crystal layer;
Form electric field in the both sides of described liquid crystal layer, make described liquid crystal layer be the convex lens structures of at least one column;
Keep the electric field intensity of described liquid crystal layer both sides constant, and adopt liquid crystal layer described in UV-irradiation under the first preset temperature condition, make the liquid crystal molecule in described liquid crystal layer be fixed on equilibrium state.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, form electric field in the both sides of described liquid crystal layer, be specially:
The underlay substrate forming liquid crystal layer is to some extent placed in electric field generating apparatus; Wherein said field generation device comprises and is positioned at described liquid crystal layer both sides and the first electrode be oppositely arranged in the region corresponding with each described convex lens structures and the second electrode group, and described second electrode group comprises side by side multiple and spaced strip sub-electrode;
Constant voltage is applied to described first electrode, different voltage is applied to each strip sub-electrode in described second electrode group and produces electric field, the pillared convex lens structures of shape; Wherein in each described second electrode group, strip sub-electrode is far away apart from the distance of the center line of described second electrode group, and the voltage of applying is larger.
Preferably; in the above-mentioned preparation method that the embodiment of the present invention provides; under nitrogen protection condition, keep the electric field intensity of described liquid crystal layer both sides constant, and adopt liquid crystal layer described in UV-irradiation under the first preset temperature condition, make the liquid crystal molecule in described liquid crystal layer be fixed on equilibrium state.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, described first preset temperature is 50 degrees Celsius ~ 80 degrees Celsius.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, before underlay substrate forms alignment films, also comprise:
The alkaline solution described underlay substrate being placed in preset concentration under the second preset temperature condition soaks Preset Time, makes the ester bond generation hydrolysis reaction in described underlay substrate;
After immersion, acid neutralization, cleaning and dry process are carried out to described underlay substrate.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, described second preset temperature is 20 degrees Celsius ~ 40 degrees Celsius, and described Preset Time is 30 seconds ~ 60 seconds.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, make after the liquid crystal molecule in described liquid crystal layer is fixed on equilibrium state, also to comprise:
Adopt volume to volume technique to be formed to be positioned at the tack coat of described underlay substrate described liquid crystal layer side dorsad, and form the protective seam covering described liquid crystal layer.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, making after the liquid crystal molecule in described liquid crystal layer is fixed on equilibrium state, before forming the tack coat being positioned at described underlay substrate described liquid crystal layer side dorsad, also comprise:
Adopt the polarisation sublayer of volume to volume technique formation between described underlay substrate and the described tack coat that will be formed.
Beneficial effect of the present invention is as follows:
The above-mentioned light controlling film that the embodiment of the present invention provides, its preparation method and vehicle-mounted display screen, comprise underlay substrate, alignment films and include can the liquid crystal layer of liquid crystal polymer of uv photopolymerization, liquid crystal layer is the convex lens structures of at least one column, thus utilize the convex lens structures of liquid crystal layer to make to limit within the specific limits from light shooting angle after liquid crystal layer of underlay substrate side incidence, and the transmitance of light can not be affected, thinner thickness simultaneously, generally can reach 2 μm ~ 5 μm, compared with existing light controlling film, thickness be its about 1/100, therefore lighter.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing light controlling film;
One of structural representation of the light controlling film that Fig. 2 a provides for the embodiment of the present invention;
Fig. 2 b is respectively the structural representation two of the light controlling film that the embodiment of the present invention provides;
The structural representation three of the light controlling film that Fig. 3 provides for the embodiment of the present invention;
The structural representation four of the light controlling film that Fig. 4 a provides for the embodiment of the present invention;
The structural representation five of the light controlling film that Fig. 4 b provides for the embodiment of the present invention;
The structural representation six of the light controlling film that Fig. 4 c provides for the embodiment of the present invention;
Fig. 5 is the structural representation of existing polaroid;
Fig. 6 a and Fig. 6 b is respectively the structural representation of the vehicle-mounted display screen that the embodiment of the present invention provides;
The process flow diagram of the preparation method of the light controlling film that Fig. 7 provides for the embodiment of the present invention;
Form the schematic diagram of electric field in the both sides of liquid crystal layer in the preparation method that Fig. 8 provides for the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly, below in conjunction with accompanying drawing, are described in detail the embodiment of light controlling film, its preparation method and vehicle-mounted display screen that the embodiment of the present invention provides.
In accompanying drawing, the shape of each parts and size do not reflect the actual proportions of light controlling film, and object just signal illustrates content of the present invention.
A kind of light controlling film that the embodiment of the present invention provides, as shown in Figure 2 a and 2 b, comprising: underlay substrate 10, and being positioned at alignment films on underlay substrate 10 11 successively and including can the liquid crystal layer 12 of liquid crystal polymer of uv photopolymerization; Wherein,
Liquid crystal layer 12 has the convex lens structures of at least one column.
The above-mentioned light controlling film that the embodiment of the present invention provides, comprising underlay substrate, alignment films and include can the liquid crystal layer of liquid crystal polymer of uv photopolymerization, liquid crystal layer is the convex lens structures of at least one column, thus utilize the convex lens structures of liquid crystal layer to make to limit within the specific limits from light shooting angle after liquid crystal layer of underlay substrate side incidence, and the transmitance of light can not be affected, thinner thickness simultaneously, generally can reach 2 μm ~ 5 μm, compared with existing light controlling film, thickness be its about 1/100, therefore lighter.
In the specific implementation, in the above-mentioned light controlling film that the embodiment of the present invention provides, the material of underlay substrate is generally cellulose acetate (TAC), acrylic or epoxy olefins resin etc., in this no limit.
In the specific implementation, in the above-mentioned light controlling film that the embodiment of the present invention provides, containing the acrylic acid groups that generally can include uv photopolymerization in the liquid crystal polymer of uv photopolymerization.
Further, for the ease of when implementing this light controlling film being fixed on the light emission side of display panel, in the above-mentioned light controlling film that the embodiment of the present invention provides, as shown in Figure 3, also comprise: the tack coat 13 being positioned at underlay substrate 10 liquid crystal layer 12 side dorsad.
Preferably, in the above-mentioned light controlling film that the embodiment of the present invention provides, as shown in Figure 3, also comprise the protective seam 14 of covering liquid crystal layer 12, liquid crystal layer can be prevented like this to be worn.
In the specific implementation, the above-mentioned light controlling film that the embodiment of the present invention provides is generally used for vehicle-carrying display screen, and the light emission side of the display panel of display screen is generally provided with polaroid, therefore can above-mentioned light controlling film be arranged outside polaroid in the specific implementation, certainly in the specific implementation, the underlay substrate of the above-mentioned light controlling film that also can provide as the embodiment of the present invention with polaroid, can reduce the integral thickness of display screen so further.
Therefore, further, in the above-mentioned light controlling film that the embodiment of the present invention provides, as shown in fig. 4 a, also comprise: the polarisation sublayer 15 between underlay substrate 10 and tack coat 13.With the function making light controlling film have polarisation simultaneously, when like this light controlling film being applied to display panels, just can saving the polaroid of display panels light emission side, thus reduce thickness further.
Further, in the above-mentioned light controlling film that the embodiment of the present invention provides, as shown in Figure 4 b, a polarisation protective seam 16 also can be set between polarisation sublayer 15 and tack coat 13 again to protect polarisation sublayer 15, in this no limit.
Particularly, the existing polaroid for display panels as shown in Figure 5, generally comprises tack coat 101, first protective seam 102, polarisation sublayer 103, second protective seam 104 and the surface-treated layer 105 that are positioned at display panel light emission side successively.In the specific implementation, the material of the first protective seam 102 and the second protective seam 104 is generally cellulose acetate (TAC), and the material of polarisation sublayer 103 is generally polyvinyl alcohol (PVA) (PVA), in this no limit.
Therefore; in the specific implementation; the above-mentioned light controlling film that the embodiment of the present invention can be provided and existing polaroid combine; namely second in polaroid is utilized to protect the underlay substrate of layer as light controlling film; utilize the surface-treated layer in polaroid as the protective seam of light controlling film; as shown in Figure 4 b, be namely equivalent to alignment films 11 and liquid crystal layer 12 to be arranged between the second protective seam 104 of the existing polaroid shown in Fig. 5 and surface-treated layer 105.
Further; in the specific implementation; in the above-mentioned light controlling film that the embodiment of the present invention provides; as illustrated in fig. 4 c; in order to play a protective role to liquid crystal layer 12 further, protective seam 14 can be set to comprise liquid crystal protective seam 140 and surface-treated layer 141, wherein; the material of liquid crystal protective seam 140 can be identical, in this no limit with the material of the first protective seam 102 or the second protective seam 104 in Fig. 5.As illustrated in fig. 4 c, be namely equivalent to alignment films 11, liquid crystal layer 12 and liquid crystal protective seam 140 to be arranged between the second protective seam 104 of the existing polaroid shown in Fig. 5 and surface-treated layer 105, in order to reduce thickness and the first protective seam 102 be removed.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of vehicle-mounted display screen, as shown in figures 6 a and 6b, comprises display panel 1, also comprises any one light controlling film 2 above-mentioned that the embodiment of the present invention that is positioned at display panel 1 light emission side provides; Wherein,
The underlay substrate 10 of light controlling film 2 is positioned near display panel 1 side.
The above-mentioned vehicle-mounted display screen that the embodiment of the present invention provides, because the light controlling film being positioned at light emission side comprises underlay substrate, alignment films and include can the liquid crystal layer of liquid crystal polymer of uv photopolymerization, liquid crystal layer is the convex lens structures of at least one column, thus utilize the convex lens structures of liquid crystal layer to make to limit within the specific limits from light shooting angle after liquid crystal layer of underlay substrate side incidence, and the transmitance of light can not be affected, thinner thickness simultaneously, generally can reach 2 μm ~ 5 μm, compared with existing light controlling film, thickness be its about 1/100, therefore lighter.
In the specific implementation, the above-mentioned vehicle-mounted display screen that the embodiment of the present invention provides, display panel can be display panels also can be organic EL display panel etc., in this no limit.But when display panel is not display panels, be be not provided with polarisation sublayer in light controlling film.
In the specific implementation, when display panel is display panels, light emission side and the incident side of display panels are generally provided with polaroid, therefore the above-mentioned vehicle-mounted display screen that provides of the embodiment of the present invention, can be as shown in Figure 6 a, light controlling film 2 is directly arranged at the light emission side of existing display panel 1.
Further, in above-mentioned vehicle-mounted display screen, when display panel is display panels, as shown in Figure 6 b, owing to being provided with polarisation sublayer 15 in light controlling film 2, therefore compared with existing vehicle-mounted display screen, the setting of the polaroid of display panel 1 light emission side can also be saved, therefore can reduce the integral thickness of display screen further.
Based on same inventive concept, the embodiment of the present invention additionally provides a kind of preparation method of light controlling film, as shown in Figure 7, can comprise the following steps:
S701, on underlay substrate, form alignment films, and carry out drying process;
S702, employing orientation process form orientation slots in alignment films;
S703, in the alignment films being formed with orientation slots coating containing can the liquid crystal polymer of uv photopolymerization to form liquid crystal layer;
S704, form electric field in the both sides of liquid crystal layer, make liquid crystal layer be the convex lens structures of at least one column;
The electric field intensity of S705, maintenance liquid crystal layer both sides is constant, and adopts UV-irradiation liquid crystal layer under the first preset temperature condition, makes the liquid crystal molecule in liquid crystal layer be fixed on equilibrium state.
In the specific implementation, in the above-mentioned preparation method that the embodiment of the present invention provides, step S704 forms electric field in the both sides of liquid crystal layer, as shown in Figure 8, is specially:
The underlay substrate 10 forming liquid crystal layer 12 is to some extent placed in electric field generating apparatus; Its midfield generation device comprises and is positioned at liquid crystal layer 12 both sides and the first electrode 31 and the second electrode group 32 be oppositely arranged in the region corresponding with each convex lens structures, and the second electrode group 32 comprises side by side multiple and spaced strip sub-electrode 320;
Constant voltage is applied to the first electrode 21, different voltage is applied to each strip sub-electrode 320 in the second electrode group 32 and produces electric field, the pillared convex lens structures of shape; Wherein in each second electrode group 32, strip sub-electrode 320 is far away apart from the distance of the center line of the second electrode group 32, and the voltage of applying is larger, as shown in Figure 8, and V1>V2>V3>V4.
This is because, when the first electrode and the second electrode group are at liquid crystal layer both sides time voltage, diverse location place voltage difference causes electric field different, thus make the anglec of rotation of liquid crystal molecule also different, thus under electric field action, make the optical axis of the liquid crystal molecule in the liquid crystal layer corresponding with each convex lens structures along the change of thickness direction in rule of light controlling film, thus liquid crystal layer is made to have the effect of convex lens.
Preferably; in the above-mentioned preparation method that the embodiment of the present invention provides; under nitrogen protection condition, perform step S705 keeps the electric field intensity of liquid crystal layer both sides constant, and adopts UV-irradiation liquid crystal layer under the first preset temperature condition, makes the liquid crystal molecule in liquid crystal layer be fixed on equilibrium state.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, the first preset temperature is 50 degrees Celsius ~ 80 degrees Celsius.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, before underlay substrate forms alignment films, also comprise:
Alkaline solution underlay substrate being placed in preset concentration under the second preset temperature condition soaks Preset Time, makes the ester bond generation hydrolysis reaction in underlay substrate;
After immersion, acid neutralization, cleaning and dry process are carried out to underlay substrate.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, the second preset temperature is 20 degrees Celsius ~ 40 degrees Celsius, and Preset Time is 30 seconds ~ 60 seconds.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, the alkaline solution of preset concentration is the NaOH of concentration between 3% ~ 5% (NaOH) solution.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, make after the liquid crystal molecule in liquid crystal layer is fixed on equilibrium state, also to comprise in step S705:
Adopt volume to volume technique to be formed to be positioned at the tack coat of underlay substrate liquid crystal layer side dorsad, and form the protective seam of covering liquid crystal layer.
Preferably, in the above-mentioned preparation method that the embodiment of the present invention provides, in step S705 making after the liquid crystal molecule in liquid crystal layer is fixed on equilibrium state, before forming the tack coat being positioned at underlay substrate liquid crystal layer side dorsad, also comprise:
Adopt the polarisation sublayer of volume to volume technique formation between underlay substrate and the tack coat that will be formed.
Further, in the above-mentioned preparation method that the embodiment of the present invention provides, step S701 forms alignment films and gravure coating process, silk screen rubbing method, spin-coating method or infusion method specifically can be adopted to be formed on underlay substrate, in this no limit.
The structure controlled for the light shown in Fig. 4 a below illustrates the preparation method of the above-mentioned light controlling film that the embodiment of the present invention provides, and specifically comprises the following steps:
(1) NaOH solution underlay substrate being placed under 20 ° ~ 40 ° temperature conditions 3% ~ 5% concentration soaks 30s ~ 60s, makes the ester bond generation hydrolysis reaction in underlay substrate generate OH
-; After immersion, acid neutralization, cleaning and dry process are carried out to underlay substrate, thus be conducive to cementing of next step alignment films.
(2) on underlay substrate, form alignment films, and carry out drying process;
In the specific implementation, gravure coating process, silk screen rubbing method, spin-coating method or infusion method is generally adopted to form alignment films, in this no limit.
In the specific implementation, the material of alignment films is generally the polyvinyl alcohol (PVA) or polyimide with hydrophobic grouping modification.
(3) orientation process is adopted to form orientation slots in alignment films;
In the specific implementation, general in alignment films, form orientation slots by friction or light allocating process, fundamental purpose is in order to the liquid crystal polymer in the liquid crystal layer of follow-up formation possesses the condition of uniformity arrangement.
(4) in the alignment films being formed with orientation slots coating containing can the liquid crystal polymer of uv photopolymerization to form liquid crystal layer;
In the specific implementation, containing the acrylic acid groups that generally can include uv photopolymerization in the liquid crystal polymer of uv photopolymerization.
(5) form electric field in the both sides of liquid crystal layer, make liquid crystal layer form the convex lens structures of at least one column;
In the specific implementation, the underlay substrate forming liquid crystal layer to some extent can be placed in electric field generating apparatus; Its midfield generation device comprises and is positioned at liquid crystal layer both sides and the first electrode be oppositely arranged in the region corresponding with each convex lens structures and the second electrode group, and the second electrode group comprises side by side multiple and spaced strip sub-electrode;
Constant voltage is applied to the first electrode, different voltage is applied to each strip sub-electrode in the second electrode group and produces electric field, the pillared convex lens structures of shape; Wherein in each second electrode group, the distance of the center line of strip sub-electrode distance the second electrode group is far away, and the voltage of applying is larger.Fundamental purpose is in order to liquid crystal molecule forms the arrangement mode of liquid crystal lens under electric field action.
(6) under the condition of nitrogen protection, keep the electric field intensity of liquid crystal layer both sides constant, and adopt UV-irradiation liquid crystal layer under 50 ° ~ 80 ° temperature conditions, make the liquid crystal molecule in liquid crystal layer be fixed on equilibrium state.Wherein 50 ° ~ 80 ° temperature conditions are mainly in order to make the liquid crystal molecule in liquid crystal layer reach equilibrium state, and the state of liquid crystal molecule when employing UV-irradiation liquid crystal layer fundamental purpose is in liquid crystal layer is fixed up.
(7) adopt volume to volume technique to be formed to be positioned at the underlay substrate polarisation sublayer of liquid crystal layer side, tack coat dorsad, and form the protective seam of covering liquid crystal layer;
Make concrete enforcement, when polarisation sublayer be positioned at underlay substrate dorsad liquid crystal layer side time, as long as after the formation order of polarisation sublayer, tack coat and protective seam ensures that tack coat is positioned at polarisation sublayer.
To sum up, the light controlling film shown in Fig. 4 a is formed by above-mentioned steps (1) ~ (7), this light controlling film utilizes the convex lens structures of liquid crystal layer to make to limit within the specific limits from light shooting angle after liquid crystal layer of underlay substrate side incidence, and the transmitance of light can not be affected, thinner thickness, generally can reach 2 μm ~ 5 μm, compared with existing light controlling film simultaneously, thickness be its about 1/100, therefore lighter.
The above-mentioned light controlling film that the embodiment of the present invention provides, its preparation method and vehicle-mounted display screen, comprise underlay substrate, alignment films and include can the liquid crystal layer of liquid crystal polymer of uv photopolymerization, liquid crystal layer is the convex lens structures of at least one column, thus utilize the convex lens structures of liquid crystal layer to make to limit within the specific limits from light shooting angle after liquid crystal layer of underlay substrate side incidence, and the transmitance of light can not be affected, thinner thickness simultaneously, generally can reach 2 μm ~ 5 μm, compared with existing light controlling film, thickness be its about 1/100, therefore lighter.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (13)
1. a light controlling film, is characterized in that, comprising: underlay substrate, and being positioned at alignment films on described underlay substrate successively and including can the liquid crystal layer of liquid crystal polymer of uv photopolymerization; Wherein,
Described liquid crystal layer is the convex lens structures of at least one column.
2. light controlling film as claimed in claim 1, is characterized in that, also comprise: the tack coat being positioned at described underlay substrate described liquid crystal layer side dorsad.
3. light controlling film as claimed in claim 1, is characterized in that, also comprise: the protective seam covering described liquid crystal layer.
4. light controlling film as claimed in claim 2, is characterized in that, also comprise: the polarisation sublayer between described underlay substrate and described tack coat.
5. a vehicle-mounted display screen, comprises display panel, it is characterized in that, also comprises the light controlling film as described in any one of claim 1-4 being positioned at described display panel light emission side; Wherein,
The underlay substrate of described light controlling film is positioned near described display panel side.
6. a preparation method for light controlling film, is characterized in that, comprising:
Underlay substrate forms alignment films, and carries out drying process;
Orientation process is adopted to form orientation slots in described alignment films;
In the alignment films being formed with described orientation slots coating containing can the liquid crystal polymer of uv photopolymerization to form liquid crystal layer;
Form electric field in the both sides of described liquid crystal layer, make described liquid crystal layer be the convex lens structures of at least one column;
Keep the electric field intensity of described liquid crystal layer both sides constant, and adopt liquid crystal layer described in UV-irradiation under the first preset temperature condition, make the liquid crystal molecule in described liquid crystal layer be fixed on equilibrium state.
7. preparation method as claimed in claim 6, is characterized in that, forms electric field, be specially in the both sides of described liquid crystal layer:
The underlay substrate forming liquid crystal layer is to some extent placed in electric field generating apparatus; Wherein said field generation device comprises and is positioned at described liquid crystal layer both sides and the first electrode be oppositely arranged in the region corresponding with each described convex lens structures and the second electrode group, and described second electrode group comprises side by side multiple and spaced strip sub-electrode;
Constant voltage is applied to described first electrode, different voltage is applied to each strip sub-electrode in described second electrode group and produces electric field, the pillared convex lens structures of shape; Wherein in each described second electrode group, strip sub-electrode is far away apart from the distance of the center line of described second electrode group, and the voltage of applying is larger.
8. preparation method as claimed in claim 6; it is characterized in that; under nitrogen protection condition, keep the electric field intensity of described liquid crystal layer both sides constant, and adopt liquid crystal layer described in UV-irradiation under the first preset temperature condition, make the liquid crystal molecule in described liquid crystal layer be fixed on equilibrium state.
9. preparation method as claimed in claim 8, it is characterized in that, described first preset temperature is 50 degrees Celsius ~ 80 degrees Celsius.
10. preparation method as claimed in claim 6, is characterized in that, before underlay substrate forms alignment films, also comprise:
The alkaline solution described underlay substrate being placed in preset concentration under the second preset temperature condition soaks Preset Time, makes the ester bond generation hydrolysis reaction in described underlay substrate;
After immersion, acid neutralization, cleaning and dry process are carried out to described underlay substrate.
11. preparation methods as claimed in claim 10, it is characterized in that, described second preset temperature is 20 degrees Celsius ~ 40 degrees Celsius, described Preset Time is 30 seconds ~ 60 seconds.
12. preparation methods as described in any one of claim 6-11, is characterized in that, make after the liquid crystal molecule in described liquid crystal layer is fixed on equilibrium state, also to comprise:
Adopt volume to volume technique to be formed to be positioned at the tack coat of described underlay substrate described liquid crystal layer side dorsad, and form the protective seam covering described liquid crystal layer.
13. preparation methods as claimed in claim 12, is characterized in that, making after the liquid crystal molecule in described liquid crystal layer is fixed on equilibrium state, before forming the tack coat being positioned at described underlay substrate described liquid crystal layer side dorsad, also comprise:
Adopt the polarisation sublayer of volume to volume technique formation between described underlay substrate and the described tack coat that will be formed.
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