CN111323957A - Color flexible display module and preparation method thereof - Google Patents
Color flexible display module and preparation method thereof Download PDFInfo
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- CN111323957A CN111323957A CN202010043382.1A CN202010043382A CN111323957A CN 111323957 A CN111323957 A CN 111323957A CN 202010043382 A CN202010043382 A CN 202010043382A CN 111323957 A CN111323957 A CN 111323957A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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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
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- G02F1/133553—Reflecting elements
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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
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The invention also provides a color flexible display module which comprises a transparent flexible substrate, a transparent upper electrode layer, a polymer dispersed liquid crystal photoelectric layer, a plasmon structure color layer, a lower electrode layer and a flexible substrate layer from top to bottom in sequence; the polymer dispersed liquid crystal photoelectric layer is prepared by taking nematic liquid crystal, polymer monomer and photoinitiator as main raw materials; the plasmon structure color layer comprises a visible light reflection metal layer made of visible light reflection metal serving as a main material, and a plurality of plasmon structures arrayed on the visible light reflection metal layer. The invention also provides a preparation method of the color flexible display module. The invention has the beneficial effects that: the metal layer with the plasmon structure on the surface and high visible light reflectivity is used as a color layer, and the enhancement effect of the surface plasmon on a specific visible spectrum is utilized to selectively enhance and reflect visible light, so that the display contrast is improved; and the polymer dispersed liquid crystal flexible display technology is combined, so that high-contrast color flexible display is realized.
Description
Technical Field
The invention relates to the technical field of display and micro-nano manufacturing, in particular to a color flexible display module and a preparation method thereof.
Background
The flexible display is a display technology with wide application prospect, the flexible display material has the characteristics of convenience in carrying and use, good pressure resistance and shock resistance, low cost and the like, has a wide market in the fields of computer display screens, electronic books, electronic tags, medical equipment, electronic communication, wearable equipment and the like, and greatly expands the places and the fields where people use displays.
Currently, flexible display technologies are classified into active display technologies and passive display technologies. The active flexible display technology has the advantages of rich colors, high brightness and the like, but also has the defects of high energy consumption, poor display effect under outdoor strong sunlight, great influence on human eye health and the like. The passive display technology works based on reflected ambient light, is much lower than the active light-emitting display technology in energy consumption, has good display effect under strong ambient light, and particularly is consistent with the habit of observing objects (including reading) through reflected light formed by human eyes for a long time. Therefore, a reflective display technology typified by electronic paper has been rapidly developed.
However, the existing mainstream electronic paper technology has the defects of slow response speed, difficulty in realizing dynamic display and difficulty in realizing colorization. The polymer dispersed liquid crystal is a novel paper-like reflective flexible display technology, has the advantages of high response speed, dynamic display realization, simple manufacture, low cost, large-format printing and the like, but has low contrast ratio and difficult colorization and limits the application of the flexible display technology; colorization of the polymer dispersed liquid crystal display can be achieved by adding a colored dye, but the addition of the dye reduces reflection of incident light, thereby further reducing brightness and contrast, and increasing driving voltage due to destruction of the interface of the polymer and the liquid crystal. Therefore, how to further improve the contrast while realizing colorization has been a problem in the polymer dispersed liquid crystal display technology.
Disclosure of Invention
The present invention is directed to a color flexible display module with high contrast and a method for manufacturing the same.
The technical scheme adopted by the invention is as follows: a color flexible display module comprises a transparent flexible substrate, a transparent upper electrode layer, a polymer dispersed liquid crystal photoelectric layer, a plasmon structure color layer, a lower electrode layer and a flexible substrate layer from top to bottom in sequence; the polymer dispersed liquid crystal photoelectric layer is prepared by taking nematic liquid crystal, a polymer monomer and a photoinitiator as main raw materials; the plasmon structure color layer comprises a visible light reflection metal layer made of visible light reflection metal serving as a main material and a plurality of plasmon structures arrayed on the visible light reflection metal layer.
According to the scheme, the polymer dispersed liquid crystal photoelectric layer comprises the following components in percentage by mass: 49-70% of nematic liquid crystal, 29-50% of polymer monomer and 0.3-3% of photoinitiator.
According to the scheme, the thickness of the polymer dispersed liquid crystal photoelectric layer is 5-20 mu m.
According to the scheme, the thickness of the plasmon structure color layer is 100-500 nm.
According to the scheme, the plasmon structure is a circular hole with the diameter of 100-500 nm and the hole depth of 10-100 nm; the plasmon structures are arrayed on the surface of the visible light reflection metal layer at equal intervals in a distance of 200-1000 nm.
According to the scheme, the visible light reflection metal layer is made of a metal material with high visible light reflectivity.
According to the scheme, the transparent flexible substrate and the flexible substrate layer are both made of organic matter films; the transparent upper electrode layer is made of an indium tin oxide transparent conductive film, a graphene transparent conductive film, an aluminum-doped zinc oxide transparent conductive film or a metal nanowire transparent conductive film; the lower electrode layer is made of a conductive metal material.
The invention also provides a preparation method of the color flexible display module, which comprises the following steps:
sequentially depositing a lower electrode layer and a visible light reflection metal layer on a flexible substrate layer;
covering a mask plate above the visible light reflection metal layer, etching the visible light reflection metal layer through the mask plate by using ultrafast laser, and processing a circular hole to form a plasmon structure color layer;
coating a polymer dispersed liquid crystal photoelectric layer above the plasmon structure color layer;
and step four, attaching the transparent flexible substrate with the transparent upper electrode layer above the polymer dispersed liquid crystal photoelectric layer, contacting the transparent upper electrode layer with the polymer dispersed liquid crystal photoelectric layer, and performing ultraviolet irradiation curing molding.
According to the scheme, the mask comprises a laser reflection layer and a transparent substrate; the laser reflection layer is arranged on the transparent substrate, light holes matched with the positions and the sizes of the plasmon structures are formed in the laser reflection layer, the light holes in the laser reflection layer are light transmission areas, and other areas in the laser reflection layer are non-light transmission areas.
According to the scheme, the pulse width of the ultrafast laser is picoseconds or femtoseconds, and the energy density is greater than the ablation threshold of the visible light reflection metal layer.
The invention has the beneficial effects that:
1. high contrast color display. The display module adopts the technical scheme that when the polymer dispersed liquid crystal photoelectric layer is in an on state, visible light reaches the visible light reflection layer with the surface provided with the plasmon structure for reflection, the surface plasmons with different sizes reflect the visible light with different wavelengths, the visible light with different colors is reflected by adjusting the sizes of the surface plasmon structures, and the surface plasmon structures with different sizes are arranged into RGB pixels, so that rich color display is realized; the display module adopts metal with a plasmon structure on the surface and high visible light reflectivity as a light reflection layer, and utilizes the characteristic that the surface plasmon structure has an enhancement effect on a specific spectrum to selectively enhance reflection on visible light, so that the reflected light intensity of different wavelengths is improved, the display contrast is improved, and high-contrast flexible display is realized. In addition, the surface plasmon structure has the characteristic of selective reflection to visible light with different incidence angles, and the incidence angle of light reaching the surface plasmon through the polymer dispersed liquid crystal photoelectric layer can be adjusted by the size of an electric field applied to the polymer dispersed liquid crystal photoelectric layer, so that the visible light with different colors can be reflected, and the colors of the flexible display module can be further enriched.
2. The response speed is high, and dynamic display can be realized. The response speed of the display module is determined by the electro-optic characteristics of the polymer dispersed liquid crystal electro-optic layer, generally, the response time of the polymer dispersed liquid crystal film under the action of an external electric field is less than 1ms, and the polymer dispersed liquid crystal film can be used as a dynamic display screen, so that the color flexible display module can realize dynamic display.
3. Simple process and large-scale production. The preparation core process of the display module comprises the preparation of a plasmon structure color layer and the preparation of a compound dispersed liquid crystal photoelectric layer. The invention adopts the mask plate to combine with the ultrafast laser fast scanning to realize the plasmon structure color layer, the laser processing process is usually carried out in the atmosphere, a large-size workpiece can be processed, and the process is simple and efficient; meanwhile, the preparation process of the polymer dispersed liquid crystal film also has the characteristics of simple process and large-format printing, so that the display module has the characteristics of simple process, large format and large-batch production.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
FIG. 2 is a schematic diagram of a mask composition for preparation of a plasmon structural color layer.
Fig. 3 is a top view of fig. 2.
FIG. 4 is a first flow chart of the manufacturing process of the present invention.
FIG. 5 is a flow chart of the second process of the present invention.
FIG. 6 is a third flow chart of the preparation process of the present invention.
FIG. 7 is a fourth flow chart of the preparation process of the present invention.
Wherein: the structure comprises a 1-transparent flexible substrate, a 2-transparent upper electrode layer, a 3-polymer dispersed liquid crystal photoelectric layer, a 4-plasmon structure color layer, a 5-lower electrode layer, a 6-flexible substrate layer, a 7-laser reflection layer, an 8-transparent substrate, a 9-opaque area, a 10-light transmission area, an 11-ultrafast laser, a 41-visible light reflection metal layer and a 42-plasmon structure.
Detailed description of the preferred embodiments
For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
As shown in fig. 1, the color flexible display module includes a transparent flexible substrate 1, a transparent upper electrode layer 2, a polymer dispersed liquid crystal photoelectric layer 3, a plasmon structural color layer 4, a lower electrode layer 5 and a flexible substrate layer 6 from top to bottom in sequence; the polymer dispersed liquid crystal photoelectric layer 3 is prepared by taking nematic liquid crystal, polymer monomer and photoinitiator as main raw materials; the plasmon structure color layer 4 comprises a visible light reflection metal layer 41 made of visible light reflection metal serving as a main material and a plurality of plasmon structures 42 arrayed on the visible light reflection metal layer 41, wherein the plasmon structures 42 are round holes with the diameters of 100-500 nm and the hole depths of 10-100 nm.
Preferably, the thickness of the polymer dispersed liquid crystal photoelectric layer 3 is 5-20 μm.
Preferably, the polymer dispersed liquid crystal photoelectric layer 3 comprises the following components in percentage by mass: 49-70% of nematic liquid crystal, 29-50% of polymer monomer and 0.3-3% of photoinitiator.
Preferably, the thickness of the visible light reflection metal layer 41 is 100 to 500 nm.
Preferably, the visible light reflective metal layer 41 is made of other metal with high visible light reflectivity, such as aluminum or silver.
Preferably, the plasmonic structures 42 are equidistantly arrayed on the surface of the visible light reflection metal layer 41 at a distance of 200-1000 nm.
In the invention, the transparent flexible substrate 1 is made of a transparent organic film (such as PET) with excellent flexibility, and the thickness of the transparent flexible substrate 1 is 10-500 um. The transparent upper electrode layer 2 is made of an indium tin oxide transparent conductive film, a graphene transparent conductive film, an aluminum-doped zinc oxide transparent conductive film or a metal nanowire transparent conductive film, and the thickness of the transparent upper electrode layer 2 is 100-500 nm. The lower electrode layer 5 is made of a metal material (such as copper) with good conductivity, and the thickness of the lower electrode layer 5 is 100-500 nm. The flexible substrate layer 6 is made of an organic film (such as PET) with excellent flexibility, and the thickness of the flexible substrate layer 6 is 10-500 um.
A method for preparing the color flexible display module comprises the following steps:
the method comprises the following steps of firstly, sequentially depositing a lower electrode layer 5 and a visible light reflection metal layer 41 of a plasmon structure color layer 4 on a flexible substrate layer 6 by adopting a thin film deposition method;
covering a mask plate above the visible light reflection metal layer 41, etching the visible light reflection metal layer 41 through the mask plate by using ultrafast laser 11, and processing a circular hole to form the plasmon structure color layer 4. As shown in fig. 2 and 3, the mask includes a laser reflecting layer 7 and a transparent substrate 8; the laser reflection layer 7 is arranged on the transparent substrate 8, the laser reflection layer 7 is provided with a light transmission hole matched with the position and the size of the plasmon structure 42, the light transmission hole on the laser reflection layer 7 is a light transmission area 10, and other areas on the laser reflection layer 7 are non-light transmission areas 10; the laser in the transparent region 10 can pass through, and the laser in the opaque region 109 is reflected back; (ii) a The laser reflecting layer 7 is made of metal material or metal oxide with high reflectivity to laser, such as chromium, chromium oxide, iron oxide, etc.; the transparent substrate 8 is made of transparent glass or transparent quartz. The pulse width of the ultrafast laser 11 is picoseconds or femtoseconds, and the energy density is slightly larger than the ablation threshold of the visible light reflective metal layer 41.
Step three, coating the polymer dispersed liquid crystal photoelectric layer 3 above the plasmon structure color layer 4 by adopting a coating method;
and step four, attaching the transparent flexible substrate 1 with the transparent upper electrode layer 2 above the polymer dispersed liquid crystal photoelectric layer 3, contacting the transparent upper electrode layer 2 with the polymer dispersed liquid crystal photoelectric layer 3, and curing and molding by ultraviolet irradiation.
The first embodiment is as follows: a flexible substrate layer 6 and a transparent flexible substrate 1 are made of PET materials; manufacturing a lower electrode layer 5 by using metal copper; the visible light reflection metal layer 41 is made of metal aluminum; adopting indium tin oxide transparent conductive film to manufacture transparent upper electrode layer 2; the specific manufacturing method of the display module is as follows:
1) preparing a piece of PET film with the thickness of 0.2mm, and cleaning and drying the PET film to be used as a flexible substrate layer 6; depositing a copper film electrode layer (namely, a lower electrode layer 5) with the thickness of 200nm and an aluminum film light reflection layer (namely, a visible light reflection metal layer 41) with the thickness of 100nm on the PET film in sequence by adopting electron beam evaporation equipment, as shown in figure 4;
2) placing a mask plate above the aluminum film light reflecting layer, wherein the mask plate adopts the wavelength of 532nm, the pulse width of 300fs, the repetition frequency of 100KHz and the energy density of 2.5J/cm2The femtosecond laser carries out rapid scanning on the mask plate, the laser penetrates through the patterned light transmission area 10 on the mask plate to etch the aluminum film light reflection layer below the mask plate in the scanning process, and the laser process parameters and the pattern size of the light transmission area 10 on the mask plate are adjusted, so that the laser etches periodic round holes with the hole depth of 30nm, the hole diameter of 150nm and the hole distance of 400nm on the aluminum film, and a plasmon structure color layer 4 is realized, as shown in fig. 5;
3) and mixing urethane acrylate and hydroxypropyl acrylate according to the weight ratio of 1: 2, mixing and stirring for 1 hour to prepare a transparent prepolymer monomer; adding nematic liquid crystal P0616A into the prepolymer monomer, wherein the mass percentages of the nematic liquid crystal and the prepolymer monomer are 60% and 37%, respectively; adding 3% by mass of photoinitiator benzoin dimethyl ether, and fully stirring for 2 hours at 60 ℃ to form a transparent polymer dispersed liquid crystal solution; uniformly coating a polymer dispersed liquid crystal solution above the plasmon structure color layer 4 by using a coater to form a polymer dispersed liquid crystal photoelectric layer 3 with a thickness of 10 μm, as shown in fig. 6;
4) a PET substrate (namely a transparent flexible substrate 1) with the thickness of 0.2mm is flatly and tightly covered on the surface of the polymer dispersed liquid crystal photoelectric layer 3 by utilizing a coating machine, an indium tin oxide transparent conductive film (namely a transparent upper electrode layer 2) with the thickness of 100nm is deposited on the PET substrate, when the PET substrate is covered on the polymer dispersed liquid crystal photoelectric layer 3, the indium tin oxide transparent conductive film is contacted with the polymer dispersed liquid crystal photoelectric layer 3, the polymer dispersed liquid crystal photoelectric layer is irradiated by ultraviolet rays with the wavelength of 365nm for 315min at room temperature, and the intensity of the ultraviolet rays is 5mw/cm2Curing the polymer dispersed liquid crystal film and shaping it with the transparent flexible substrate 1With good adhesion, the desired color flexible display module is obtained, as shown in fig. 7.
Example two: a flexible substrate layer 6 and a transparent flexible substrate 1 are made of PET materials; the lower electrode layer 5 is made of metal aluminum; the visible light reflection metal layer 41 is made of metal silver; manufacturing a transparent upper electrode layer 2 by adopting an aluminum-doped zinc oxide transparent conductive film; the specific manufacturing method of the display module is as follows:
1) preparing a piece of PET film with the thickness of 0.1mm, and cleaning and drying the PET film to be used as a flexible substrate layer 6; an aluminum film electrode layer (lower electrode layer 5) with the thickness of 200nm and a silver film light reflecting layer (visible light reflecting metal layer 41) with the thickness of 100nm are sequentially deposited on the PET film by adopting an electron beam evaporation device, as shown in figure 4;
2) placing a mask plate above the silver film light reflecting layer, and adopting the wavelength of 532nm, the pulse width of 10ps, the repetition frequency of 500KHz and the energy density of 2.5J/cm2The picosecond laser rapidly scans the mask plate; in the scanning process, laser penetrates through the patterned light-transmitting area 10 on the mask plate to etch the silver film light reflecting layer below the mask plate, and the technological parameters of the laser and the pattern size of the light-transmitting area 10 on the mask plate are adjusted, so that periodic round holes with the hole depth of 50nm, the hole diameter of 200nm and the hole distance of 450nm are etched on the silver film by the laser, and the plasmon structure color layer 4 is realized, as shown in fig. 5;
3) mixing 43%, 56% and 1% of ultraviolet light curing adhesive NOA65, nematic liquid crystal P0616A and photoinitiator xylene ketone according to the mass percentage, fully stirring for 2 hours at 60 ℃ to form a transparent polymer dispersed liquid crystal solution, and then uniformly coating the polymer dispersed liquid crystal solution on the plasmon structural color layer 4 by using a coating machine to form a polymer dispersed liquid crystal photoelectric layer 3 with the thickness of 5 microns, as shown in FIG. 6;
4) a PET substrate (namely a transparent flexible substrate 1) with the thickness of 0.1mm is flatly and tightly covered on the surface of the polymer dispersed liquid crystal photoelectric layer 3 by using a coating machine, and an aluminum-doped zinc oxide transparent conductive film (namely a lower electrode layer 5) with the thickness of 100nm is deposited on the PET substrate; when the PET substrate is covered on the polymer dispersed liquid crystal photoelectric layer 3, the aluminum-doped zinc oxide transparent conductive film and the polymer are mixedContacting the polymer dispersed liquid crystal photoelectric layer 3, irradiating the polymer dispersed liquid crystal photoelectric layer with ultraviolet ray with wavelength of 365nm at room temperature for 310min, wherein the intensity of the ultraviolet ray is 8mw/cm2The polymer dispersed liquid crystal film is cured and forms a good bond with the transparent flexible substrate 1 to obtain the desired color flexible display module, as shown in fig. 7.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims (10)
1. A color flexible display module is characterized by comprising a transparent flexible substrate, a transparent upper electrode layer, a polymer dispersed liquid crystal photoelectric layer, a plasmon structure color layer, a lower electrode layer and a flexible substrate layer from top to bottom in sequence; the polymer dispersed liquid crystal photoelectric layer is prepared by taking nematic liquid crystal, a polymer monomer and a photoinitiator as main raw materials; the plasmon structure color layer comprises a visible light reflection metal layer made of visible light reflection metal serving as a main material and a plurality of plasmon structures arrayed on the visible light reflection metal layer.
2. The color flexible display module according to claim 1, wherein the polymer dispersed liquid crystal electro-optic layer comprises the following components in percentage by mass: 49-70% of nematic liquid crystal, 29-50% of polymer monomer and 0.3-3% of photoinitiator.
3. The color flexible display module according to claim 1, wherein the polymer dispersed liquid crystal electro-optical layer has a thickness of 5 to 20 μm.
4. The color flexible display module according to claim 1, wherein the thickness of the plasmon structural color layer is 100 to 500 nm.
5. The color flexible display module according to claim 1, wherein the plasmonic structure is a circular aperture with an equally spaced array on the surface of the visible light reflecting metal layer.
6. The color flexible display module of claim 1, wherein the visible light reflecting metal layer is made of a metal material having a high visible light reflectivity.
7. The color flexible display module according to claim 1, wherein the transparent flexible substrate and the flexible substrate layer are made of organic thin films; the transparent upper electrode layer is made of an indium tin oxide transparent conductive film, a graphene transparent conductive film, an aluminum-doped zinc oxide transparent conductive film or a metal nanowire transparent conductive film; the lower electrode layer is made of a conductive metal material.
8. A method of manufacturing a color flexible display module according to claim 1, comprising the steps of:
sequentially depositing a lower electrode layer and a visible light reflection metal layer on a flexible substrate layer;
covering a mask plate above the visible light reflection metal layer, etching the visible light reflection metal layer through the mask plate by using ultrafast laser, and processing a circular hole to form a plasmon structure color layer;
coating a polymer dispersed liquid crystal photoelectric layer above the plasmon structure color layer;
and step four, attaching the transparent flexible substrate with the transparent upper electrode layer above the polymer dispersed liquid crystal photoelectric layer, contacting the transparent upper electrode layer with the polymer dispersed liquid crystal photoelectric layer, and performing ultraviolet irradiation curing molding.
9. The method of claim 8, wherein the mask comprises a laser reflective layer and a transparent substrate; the laser reflection layer is arranged on the transparent substrate, light holes matched with the positions and the sizes of the plasmon structures are formed in the laser reflection layer, the light holes in the laser reflection layer are light transmission areas, and other areas in the laser reflection layer are non-light transmission areas.
10. The method of claim 8, wherein the ultrafast laser has a pulse width of picoseconds or femtoseconds and an energy density greater than an ablation threshold of the visible light reflective metal layer.
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| CN113281929A (en) * | 2021-03-04 | 2021-08-20 | 桂林电子科技大学 | Electrotunable liquid crystal gap plasma structure color filter |
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Application publication date: 20200623 |