CN109240016A - A kind of electrophoretic display device (EPD) - Google Patents
A kind of electrophoretic display device (EPD) Download PDFInfo
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- CN109240016A CN109240016A CN201811158724.3A CN201811158724A CN109240016A CN 109240016 A CN109240016 A CN 109240016A CN 201811158724 A CN201811158724 A CN 201811158724A CN 109240016 A CN109240016 A CN 109240016A
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- electrophoretic display
- epd
- display device
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- photochromic material
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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
- G02F1/165—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 translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—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 translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The present invention relates to a kind of electrophoretic display device (EPD)s, it includes the color layer of electrophoretic display layer with the observation side for being covered on the electrophoretic display layer, the color layer is provided with 2-100 colored region, each colored region covers multiple pixels of the electrophoretic display layer, each colored region is provided with photochromic material, the electrophoretic display device (EPD) further includes for the excitation light source to color layer irradiation exciting light, the photochromic material presents colored under the irradiation of exciting light and is translucent, when excitation light source is closed, the photochromic material is colourless.The colored region of the electrophoretic display device (EPD) realizes colored display by excitation light source excitation photochromism material, and due to only 2-100 colored region, each colored region covers multiple pixels, therefore color layer can be produced by the modes such as spraying, printing, its production technology is fairly simple, and cost is lower.
Description
Technical field
The present invention relates to the field of display device more particularly to a kind of electrophoretic display device (EPD)s.
Background technique
Electric paper display is a kind of as thin as paper, soft and erasable display, in recent years in billboard and coloured silk
It is more and more widely used on color board.Existing electrophoretic display device (EPD) can only substantially show black-and-white two color, cannot show coloured silk
Color, this makes its application be very limited.In the prior art, have through photochromic material and realize electric paper display
Colored display technical solution, but need to be coated with a variety of photochromic materials on each pixel, manufacturing process is very
Complexity, cost are very high.
Summary of the invention
Based on the deficiencies of the prior art, the technical problem to be solved by the invention is to provide it is a kind of low cost and can show
Colored electrophoretic display device (EPD).
The embodiment of the present invention provides a kind of electrophoretic display device (EPD) comprising electrophoretic display layer and is covered on the electrophoretic display layer
Observation side color layer, the color layer is provided with 2-100 colored region, and each colored region covers the electrophoresis showed
Multiple pixels of layer, each colored region are provided with photochromic material, and the electrophoretic display device (EPD) further includes for institute
The excitation light source of color layer irradiation exciting light is stated, the photochromic material presents colored under the irradiation of exciting light and is semi-transparent
Bright state, when excitation light source is closed, the photochromic material is colourless.
In a further preferred embodiment, the photochromic material includes the one or more of following material: propylene
Acid -9- anthracene methyl esters, methacrylic acid -9- anthracene methyl esters, ethidium bromide-N, N`- diacetamide, fluorescein-O- acrylate, 2- naphthalene
Base acrylate, N- (1- naphthalene) ethylendiamine dihydrochloride, 7- [4- (trifluoromethyl) cumarin] acrylamide, 9- vinyl
Anthracene, polyacrylic acid -9- anthracene methyl esters, poly- (3,3 ', 4,4 '-benzophenone tetracarboxylic dianhydride-ALT-3,6- proflavin hemisulfic acids
Salt), poly- (fluorescein O- acrylate), poly- [(methyl methacrylate)-CO- methacryloxy fluorescein], poly- (2- naphthalene
Base acrylate), poly- [N- (1- naphthalene)-N phenyl acrylamide], poly- (pyromellitic acid anhydride-CO- thionine), poly- (2- second
Alkenyl naphthalene), CuPc, dichloro three (1,10- phenanthroline) ruthenium (II) hydrate, 8-hydroxyquinoline mantoquita, four (2- methyl -8- hydroxyls
Base quinoline) boron lithium, 2,3- dichloride naphthalene Tin Phthalocyanine, three (8-hydroxyquinoline)-erbiums, 8-hydroxyquinoline aluminium, benzo [k] fluoranthene, 1,
Bis- (the 2- amino-benzene oxygen)-ethane-N, N, N ' of 2-, N '-tetraacethyl, 2- tert-butyl anthraquinone, 3,8- diamino -6- phenylphenanthridineand,
5,8- dihydroxy -1,4- naphthoquinones, 2,3- diphenyl maleic anhydride, 7- hydroxyl -4- trifluoromethyl cumarin, long Luo Liding, phenanthridines,
1- pyrene formaldehyde.
In a further preferred embodiment, the excitation light source is ultraviolet source or infrared light supply.
In a further preferred embodiment, the excitation light source is flasher, and luminescence display time interval is
0.01s-100s。
In a further preferred embodiment, the quantity of the colored region is 2-10 or the colored region
The ratio that the sum of area accounts for the display area of the electrophoretic display device (EPD) is 10-70%.
In a further preferred embodiment, there are many excitation light sources for the electrophoretic display device (EPD) setting, for exciting difference
Photochromic material, or different colours is inspired to same photochromic material.
In a further preferred embodiment, at least two colored regions are disposed adjacent, the light-induced variable of neighboring colored regions
Color material is different, and different photochromic materials present different colored under the irradiation of exciting light and are translucent；Or
The discrete distribution of 2-100 colored region, and the photochromic material of all colored regions is identical；
Or the discrete distribution of 2-100 colored region, and the photochromic material of at least two colored regions is different,
Different photochromic materials present different colored under the irradiation of exciting light and are translucent.
In a further preferred embodiment, the electrophoretic display device (EPD) further includes backboard and transparent front plate, it is described it is transparent before
Plate, electrophoretic display layer and backboard stack gradually connection from outside to inside；
It is covered with conductive film in the transparent front plate, is provided with display circuit on the backboard；Or it is described it is transparent before
It is provided with display circuit on plate, is provided with conductive film on the backboard；The display circuit and conductive film are for driving institute
State electrophoretic display layer；
The photochromic material is covered on the sight of the transparent front plate by the way of coating, spraying, printing or printing
Examine side；Or
The electrophoretic display device (EPD) further includes colored laminar substrate, and the photochromic material is covered on the colored laminar substrate
Exiting side, and the observation side of the transparent front plate is arranged in the colored laminar substrate；Or
The electrophoretic display device (EPD) further includes light guide plate, and the photochromic material is covered on the light guide plate.
In a further preferred embodiment, the conductive film is graphene film.
In a further preferred embodiment, the electrophoretic display device (EPD) further includes light guide plate, and the light guide plate is arranged in institute
The observation side of electrophoretic display layer is stated, the electrophoretic display device (EPD) further includes preceding radiant, and the preceding radiant is visible light source, described
Photochromic material be under the preceding radiant irradiation it is colourless, the excitation light source and preceding radiant are arranged at the leaded light
The side of plate.
The electrophoretic display device (EPD) of the embodiment of the present invention, colored region are realized by excitation light source excitation photochromism material
Colour display, and due to only 2-100 colored region, the multiple pixels of each colored region covering, therefore spray can be passed through
The modes such as painting, printing can produce color layer, and production technology is fairly simple, and cost is lower.
Detailed description of the invention
It is more particularly described by the preferred embodiment of the present invention shown in the drawings, the above and other purpose of the present invention, feature
It will be become more fully apparent with advantage.Identical appended drawing reference indicates identical part in all the attached drawings, and not deliberately by real
Size equal proportion scaling in border draws attached drawing, it is preferred that emphasis is shows this purport.
Fig. 1 is the structural schematic diagram for the electrophoretic display device (EPD) that first embodiment of the invention provides.
Fig. 2 is the structural schematic diagram for the electrophoretic display device (EPD) that second embodiment of the invention provides.
Fig. 3 is the structural schematic diagram for the electrophoretic display device (EPD) that third embodiment of the invention provides.
Fig. 4 is the structural schematic diagram for the electrophoretic display device (EPD) that fourth embodiment of the invention provides.
Fig. 5 is the light source arrangement schematic diagram of electrophoretic display device (EPD) provided in an embodiment of the present invention.
Fig. 6 is the structural schematic diagram of the color display layer of electrophoretic display device (EPD) provided in an embodiment of the present invention.
Fig. 7 and Fig. 8 is the displaying principle figure of electrophoretic display device (EPD) provided in an embodiment of the present invention.
Specific embodiment
To facilitate the understanding of the present invention, below with reference to relevant drawings to being originally described more fully.
It should be noted that it can be directly to separately when an element is considered as " connection " another element
One element and it is in combination be integrated, or may be simultaneously present centering elements.Term as used herein " installation ", " one
End ", " other end " and similar statement are for illustrative purposes only.
Unless otherwise defined, the technology of all technical and scientific terms used herein and the technical field for belonging to this
The normally understood meaning of personnel is identical.Term used in book described herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
Fig. 1 to Fig. 8 is please referred to, the embodiment of the present invention provides a kind of electrophoretic display device (EPD) comprising electrophoretic display layer 12 and cover
The color layer 14 in the observation side of electrophoretic display layer 12 is covered, color layer 14 is provided with 2-100 colored region 141, each colour
Multiple pixels of the covering of region 141 electrophoretic display layer 12.Specifically, electrophoretic display layer 12 is general at least has hundreds of thousands of
To millions of a pixels, the size of each pixel is between tens microns to several hundred microns, therefore each colored region 141
Generally cover several hundred to tens of thousands of or even hundreds of thousands of a pixels.Each colored region 141 is provided with photochromic material.
Electrophoretic display device (EPD) further includes the excitation light source 30 for irradiating exciting light to color layer 14, photograph of the photochromic material in exciting light
It penetrates lower presentation colour and is translucent, when excitation light source 30 is closed, photochromic material is colourless, namely works as excitation light source 30
When unlatching, colour is presented in colored region 141.Certainly, there can also be achromatic region in the color layer 14, achromatic region does not have
Photochromic material is set, therefore the color presented is exactly the color of electrophoretic display layer 12.
The electrophoretic display device (EPD) can also include backboard 11 and transparent front plate 13, transparent front plate 13, electrophoretic display layer 12 and back
Plate 11 stacks gradually connection, transparent front plate 13 and backboard 11 from outside to inside and is connect by circuit with control unit, in electrophoresis
12 both ends of display layer apply electric signal, and electrophoretic display layer 12 is made to show required content.Color layer 14 can be laminated be connected to it is transparent
The observation side (i.e. the upside of Fig. 1) of foreboard 13, a variety of photochromic materials are in the observation side surface for being parallel to transparent front plate 13
Plane on be distributed.
In a preferred embodiment, electrophoretic display layer 12 includes multiple microcapsules 121, has electrophoresis in each microcapsules 121
Liquid and the electrophoresis particle being suspended in electrophoresis liquid, transparent front plate 13 and backboard 11 apply electric field at the both ends of microcapsules 121, make electricity
Swimming particle moves in electrophoresis liquid under electric field action, to show required content.It, can be with by controlling the number of pulses of electric signal
Electrophoresis particle is controlled with a distance from transparent front plate 13, since translucent colour is presented in color layer 14 under the irradiation of exciting light,
Therefore the colored depth can control with a distance from transparent front plate 13 by control electrophoresis particle.
In a preferred embodiment, there is white electrophoretic particles and black electrophoretic particles, white electrophoretic in each microcapsules 121
Particle is electrically charged (such as positive charge), the charge of black electrophoretic particles band and white electrophoretic particles opposite polarity (such as negative electricity
Lotus).Now illustrate the working principle of electrophoretic display device (EPD) of the present invention by taking the embodiment as an example.Referring to FIG. 7, working as 13 He of transparent front plate
When electrophoretic display layer 12 applies negative voltage pulse, white electrophoretic particles are moved to close to the position of the transparent front plate 13 backboard 11
It sets, black electrophoretic particles are then moved to close to the position of the backboard 11, pass through excitation light source 30 (such as ultraviolet source) at this time
Exciting light (such as ultraviolet light) is irradiated to color layer 14, corresponding color (example is presented in the colored region 141 in color layer 14 at this time
Such as red), and visible light passes through color layer 14 and transparent front plate 13, reflects and be pierced by color layer 14 by white electrophoretic particles, this
When the colored region 141 red is substantially presented.Referring to FIG. 8, when transparent front plate 13 and backboard 11 apply in electrophoretic display layer 12
When positive voltage pulse, black electrophoretic particles are moved to close to the position of transparent front plate 13, and white electrophoretic particles are then moved to close
Exciting light is irradiated to color layer 14 by excitation light source 30 at this time in the position of backboard 11, and the colored region 141 in color layer 14 is in
Existing corresponding color (such as red), and after visible light passes through color layer 14 and transparent front plate 13, it is absorbed by black electrophoretic particles,
The colored region 141 is substantially in black at this time.For the electrophoretic display layer 12 not covered by colored region 141, then at this
The color of electrophoresis particle itself, such as white or black are presented under two kinds of voltage signals.In other embodiments, white electrophoretic grain
Son can electrically charged (such as positive charge), black electrophoretic particles are not charged.
Photochromic material preferably includes the one or more of following material: acrylic acid -9- anthracene methyl esters (9-
Anthracenylmethyl acrylate), methacrylic acid -9- anthracene methyl esters (9-Anthracenylmethyl
Methacrylate), ethidium bromide-N, N`- diacetamide (Ethidium bromide-N, N '-bisacrylamide), glimmering
Light element-O- acrylate (Fluorescein o-acrylate), 2- naphthalene acrylate (2-Naphthyl acrylate),
[4- (trifluoromethyl) is fragrant by N- (1- naphthalene) ethylendiamine dihydrochloride (N- (1-Naphthyl)-N-phenylacrylamide), 7-
Legumin] acrylamide (7- [4- (Trifluoromethyl) coumarin] acrylamide), 9- vinyl anthracene (9-
Vinylanthracene), polyacrylic acid -9- anthracene methyl esters (poly 9-Anthracenylmethyl acrylate), it is poly- (3,
3 ', 4,4 '-benzophenone tetracarboxylic dianhydride-ALT-3,6- proflavin Hemisulphates) (Poly (3,3 ', 4,4 '-
benzophenonete tracarboxylic dianhydride-alt-3,6-diaminoacridine
Hemisulfate)), poly- (fluorescein O- acrylate) (Poly (fluorescein O-acrylate)), poly- [(metering system
Sour methyl esters)-CO- methacryloxy fluorescein] (Poly (fluorescein O-methacrylate)), poly- (2- naphthalene
Acrylate) (Poly (2-naphthyl acrylate)), poly- [N- (1- naphthalene)-N phenyl acrylamide] (Poly [N- (1-
Naphthyl)-N-phenylacrylamide]), poly- (pyromellitic acid anhydride-CO- thionine) (Poly (pyromellitic
Dianhydride-co-thionin)), poly- (2- vinyl naphthalene) (Poly (2-vinylnaphthalene)), CuPc
(Copper (II) phthalocyanine), dichloro three (1,10- phenanthroline) ruthenium (II) hydrate (Dichlorotris (1,10-
Phenanthroline) ruthenium (II) hydrate), 8-hydroxyquinoline mantoquita (8-Hydroxyquinoline copper
(II) salt), four (2- methyl -8-hydroxyquinoline) boron lithium (Lithium tetra (2-methyl-8-
Hydroxyquinolinato) boron), 2,3- dichloride naphthalene Tin Phthalocyanine (Tin (IV) 2,3-naphthalocyanine
Dichloride), three (8-hydroxyquinoline)-erbiums (Tris (8-hydroxyquinolinato) erbium (III)), 8- hydroxyl quinoline
Quinoline aluminium (Tris- (8-hydroxyquinoline) aluminum), benzo [k] fluoranthene (Benzo [k] fluoranthene), 1,
Bis- (the 2- amino-benzene oxygen)-ethane-N, N, N ' of 2-, N '-tetraacethyl (1,2-Bis (2-Aminophenoxy) ethane-N, N,
N ', N '-tetraacetic acid), 2- tert-butyl anthraquinone (2-tert-Butylanthraquinone), 3,8- diamino -6-
Phenylphenanthridineand (3,8-Diamino-6-phenylphenanthridine), 5,8- dihydroxy -1,4- naphthoquinones (5,8-
Dihydroxy-1,4-naphthoquinone), 2,3- diphenyl maleic anhydride (2,3-Diphenylmaleic
Anhydride), 7- hydroxyl -4- trifluoromethyl cumarin (7-Hydroxy-4- (trifluoromethyl) coumarin), long
Luo Liding (Julolidine), phenanthridines (Phenanthridine), 1- pyrene formaldehyde (1-Pyrenecarboxaldehyde).
In a preferred embodiment, excitation light source 30 is ultraviolet source or infrared light supply, will not influence the electrophoresis showed in this way
The color that device is showed.In another preferred embodiment, electrophoretic display device (EPD) setting is there are many excitation light source 30, such as can be with
Existing infrared light supply, and have ultraviolet source, it can also all be ultraviolet source or infrared light supply, but there is different frequencies, respectively
For exciting different photochromic materials, even if also colour is presented in photochromic material；Or to same photochromic material
Different colours is inspired, such as in cerise under a kind of irradiation of excitation light source 30, and in another excitation light source 30
Irradiate lower pinkiness.
In a preferred embodiment, excitation light source 30 is flasher, and luminescence display time interval is 0.01s-100s, preferably
Ground is 0.1s-10s.Since excitation light source 30 constantly flashes, the color of colored region 141 also constantly changes, and forms flashing
Effect can more cause user's note that can be used for the scenes such as the sales promotion information field of electronic price label.
Referring to FIG. 6, in a preferred embodiment, the quantity of colored region 141 is 2-10.In another preferred embodiment
In, the sum of the area of colored region 141 account for the display area of electrophoretic display device (EPD) ratio be 10-70%, and color layer 14 its
His region be then in it is colourless, make electrophoretic display device (EPD) show electrophoretic display layer 12 inherent color.The area of single colored region 141 is big
It causes between 0.1 square centimeter to 10 square centimeters.
Referring to FIG. 6, in a preferred embodiment, at least two colored regions 141 are disposed adjacent, neighboring colored regions 141
Photochromic material it is different, different photochromic materials present different colored under the irradiation of exciting light and are translucent
State.Specifically, different photochromic materials be can be, different colours is presented under the irradiation of same exciting light, be also possible to
Different colours are presented in different photochromic materials under the irradiation in respective exciting light.By taking Fig. 6 as an example, the electrophoresis showed utensil
There are three colored regions 141: red (R), green (G) and blue (B), and three colored regions 141 successively abut.
In another preferred embodiment, the discrete distribution of 2-100 colored region 141 namely these colored regions
141 do not abut each other, between it is spaced apart, and the photochromic material of all colored regions 141 is identical.Another preferred
In embodiment, the discrete distribution of 2-100 colored region 141, and the photochromic material of at least two colored regions 141
Difference, different photochromic materials present different colored under the irradiation of exciting light and are translucent.It specifically, can be with
It is that different colours are presented in different photochromic materials under the irradiation of same exciting light, is also possible to different photochromic materials
Different colours are presented under the irradiation in respective exciting light.
Fig. 1 to Fig. 3 is please referred to, in a preferred embodiment, transparent front plate 13 is by electrode base board 131 and is covered in electrode base board
Transparent conductive film 132 (such as ito thin film or graphene film) on 131 inner surface is constituted, and transparent front plate 13 is as electricity
TFT display circuit has then can be set on backboard 11 in the preceding electrode of phoretic display, for controlling in electrophoretic display device (EPD) shows
Hold.Referring to FIG. 4, in further embodiments, display circuit is formed in the inside of transparent front plate 13, it is provided with and leads on backboard 11
Conductive film, as the rear electrode of electrophoretic display device (EPD), electrophoretic display layer 12 and backboard 11 are encapsulated by sealant 18.Sealant 18 wraps
The side surface of the inner surface of backboard 11, side surface and electrophoretic display layer 12 is covered, and is connect with the inner surface of transparent front plate 13.Display
Circuit and conductive film 132 are provided commonly for applying on electrophoretic display layer 12 voltage to drive electrophoretic display layer 12.
In some embodiments, photochromic material is directly overlayed using modes such as coating, spraying, printing, printings
The observation side of bright foreboard 13 forms color layer 14.Referring to FIG. 2, in further embodiments, which is additionally provided with
Colored laminar substrate 15, photochromic material are covered on the inside of colored laminar substrate 15, color layer 14 are formed, then by color layer base
Plate 15 is connect with the observation side surface of transparent front plate 13, and color layer 14 is clamped in the observation of colored laminar substrate 15 and transparent front plate 13
Between side.Colored laminar substrate 15 can be made of materials such as polyethylene terephthalate (PET), polyethylene (PE).It please join
Fig. 3 is examined, light guide plate 16 also can be set in electrophoretic display device (EPD), and photochromic material is covered on the inside of light guide plate 16, is formed colored
Light guide plate 16, then connect by layer 14 with the observation side surface of transparent front plate 13.Light element 161 is provided on light guide plate 16,
The incident light or reflected light that can be used for enhancing the electrophoretic display device (EPD), can be used for the light for importing other secondary light sources.
Fig. 3 and Fig. 5 are please referred to, in a preferred embodiment, electrophoretic display device (EPD) further includes light guide plate 16, and the setting of light guide plate 16 exists
The observation side of electrophoretic display layer 12, electrophoretic display device (EPD) further include preceding radiant 40, and preceding radiant 40 is visible light source, for enhancing
The display brightness of electrophoretic display device (EPD), photochromic material are colourless, excitation light source 30 and preceding light light under the irradiation of preceding radiant 40
Source 40 is arranged at the side of light guide plate 16.When needing to show colour, excitation light source 30 and preceding radiant 40 are opened simultaneously, without
When needing to show colour, then radiant 40 before can only opening.
The electrophoretic display device (EPD) of the embodiment of the present invention, colored region are realized by excitation light source excitation photochromism material
Colour display, and due to only 2-100 colored region, the multiple pixels of each colored region covering, therefore spray can be passed through
The modes such as painting, printing can produce color layer, and production technology is fairly simple, and cost is lower.
The several embodiments invented above described embodiment only expresses, the description thereof is more specific and detailed, but not
It can therefore be construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection model of the invention
It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of electrophoretic display device (EPD) comprising the color layer of electrophoretic display layer and the observation side for being covered on the electrophoretic display layer,
It is characterized in that, the color layer is provided with 2-100 colored region, each colored region covers the more of the electrophoretic display layer
A pixel, each colored region are provided with photochromic material, and the electrophoretic display device (EPD) further includes for the colour
The excitation light source of layer irradiation exciting light, the photochromic material present colored under the irradiation of exciting light and are translucent
State, when excitation light source is closed, the photochromic material is colourless.
2. electrophoretic display device (EPD) as described in claim 1, which is characterized in that the photochromic material includes the one of following material
Kind is a variety of: acrylic acid -9- anthracene methyl esters, methacrylic acid -9- anthracene methyl esters, ethidium bromide-N, N`- diacetamide, fluorescein-O-
Acrylate, 2- naphthalene acrylate, N- (1- naphthalene) ethylendiamine dihydrochloride, 7- [4- (trifluoromethyl) cumarin] acryloyl
Amine, 9- vinyl anthracene, polyacrylic acid -9- anthracene methyl esters, poly- (3,3 ', 4,4 '-benzophenone tetracarboxylic dianhydride-ALT-3,6- diaminos
Base acridine Hemisulphate), poly- (fluorescein O- acrylate), poly- [(methyl methacrylate)-CO- methacryloxy is glimmering
Light element], poly- (2- naphthalene acrylate), poly- [N- (1- naphthalene)-N phenyl acrylamide], poly- (pyromellitic acid anhydride-CO-
Thionine), poly- (2- vinyl naphthalene), CuPc, dichloro three (1,10- phenanthroline) ruthenium (II) hydrate, 8-hydroxyquinoline mantoquita, four
(2- methyl -8-hydroxyquinoline) boron lithium, 2,3- dichloride naphthalene Tin Phthalocyanine, three (8-hydroxyquinoline)-erbiums, 8-hydroxyquinoline aluminium, benzene
And bis- (the 2- amino-benzene oxygen)-ethane-N, N, N ' of [k] fluoranthene, 1,2-, N '-tetraacethyl, 2- tert-butyl anthraquinone, 3,8- diamino-
6- phenylphenanthridineand, 5,8- dihydroxy -1,4- naphthoquinones, 2,3- diphenyl maleic anhydride, 7- hydroxyl -4- trifluoromethyl cumarin, long
Luo Liding, phenanthridines, 1- pyrene formaldehyde.
3. electrophoretic display device (EPD) as described in claim 1, which is characterized in that the excitation light source is ultraviolet source or infrared light
Source.
4. electrophoretic display device (EPD) as described in claim 1, which is characterized in that the excitation light source is flasher, luminescence display
Time interval is 0.01s-100s.
5. electrophoretic display device (EPD) as described in claim 1, which is characterized in that the quantity of the colored region is 2-10, or
The ratio that the sum of the area of the colored region accounts for the display area of the electrophoretic display device (EPD) is 10-70%.
6. electrophoretic display device (EPD) as described in claim 1, which is characterized in that there are many exciting lights for the electrophoretic display device (EPD) setting
Source for exciting different photochromic materials, or inspires different colours to same photochromic material.
7. electrophoretic display device (EPD) as described in claim 1, which is characterized in that at least two colored regions are disposed adjacent, adjacent coloured silk
The photochromic material in color region is different, and different photochromic materials present different colored under the irradiation of exciting light and are semi-transparent
Bright state；
Or the discrete distribution of 2-100 colored region, and the photochromic material of all colored regions is identical；
Or the discrete distribution of 2-100 colored region, and the photochromic material of at least two colored regions is different, it is different
Photochromic material presents different colored under the irradiation of exciting light and is translucent.
8. electrophoretic display device (EPD) as described in any one of claim 1 to 7, which is characterized in that the electrophoretic display device (EPD) further includes back
Plate and transparent front plate, the transparent front plate, electrophoretic display layer and backboard stack gradually connection from outside to inside；
It is covered with conductive film in the transparent front plate, is provided with display circuit on the backboard；Or in the transparent front plate
It is provided with display circuit, is provided with conductive film on the backboard；The display circuit and conductive film are for driving the electricity
Swimming display layer；
The photochromic material is covered on the observation side of the transparent front plate by the way of coating, spraying, printing or printing；
Or
The electrophoretic display device (EPD) further includes colored laminar substrate, and the photochromic material is covered on the outgoing of the colored laminar substrate
Side, and the observation side of the transparent front plate is arranged in the colored laminar substrate；Or
The electrophoretic display device (EPD) further includes light guide plate, and the photochromic material is covered on the light guide plate.
9. electrophoretic display device (EPD) as claimed in claim 8, which is characterized in that the conductive film is graphene film.
10. electrophoretic display device (EPD) as described in any one of claim 1 to 7, which is characterized in that the electrophoretic display device (EPD) further includes leading
The observation side of the electrophoretic display layer is arranged in tabula rasa, the light guide plate, and the electrophoretic display device (EPD) further includes preceding radiant, described
Preceding radiant is visible light source, the photochromic material be under the preceding radiant irradiation it is colourless, the excitation light source and
Preceding radiant is arranged at the side of the light guide plate.
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