CN111123600A - Electrochromic display panel and electronic paper - Google Patents

Abstract

The invention relates to an electrochromic display panel and electronic paper, the electrochromic display panel comprises a printing substrate layer, a printing ink layer, a light-transmitting layer, an electrochromic pixel array and a substrate layer which are sequentially arranged, the printing ink layer is attached to the printing substrate layer, the electrochromic pixel array comprises a first transparent electrode, a black electrochromic layer and a second transparent electrode which are sequentially arranged on the light-transmitting layer, the black electrochromic layer comprises a plurality of electrochromic black sub-pixel units, when the power is on, the black electrochromic layer becomes pure black, and when the power is off, the black electrochromic layer is transparent; the printing ink layer comprises a plurality of CMY color ink dot matrixes, and the electrochromic display panel displays various colors except pure black through the printing ink layer; the first transparent electrode is provided with a first opposite surface opposite to the second transparent electrode, the second transparent electrode is provided with a second opposite surface opposite to the first transparent electrode, and the first opposite surface and/or the second opposite surface are/is provided with micro-nano structures.

Description

Electrochromic display panel and electronic paper

Technical Field

The invention relates to an electrochromic display panel and electronic paper, and belongs to the technical field of display.

Background

Current display technologies can be divided into two broad categories: one type is paper display, which is mainly characterized in that: content is displayed by reflecting ambient light, color display is easy, viewing angle is large (close to 180 degrees), and the medium is soft. The other type is electronic display such as CRT, LCD, LED, etc., which is mainly characterized in that: the information can be refreshed quickly, the content is displayed by means of the internal luminescence of the display, more electric energy is consumed during working, people are easy to fatigue during reading, and the medium is not soft. Electrochromism (EC) refers to a phenomenon in which optical properties (reflectivity, transmittance, absorption, etc.) of a material undergo a stable and reversible color change under the action of an external electric field, and is visually represented as a reversible change in color and transparency. Materials having electrochromic properties are referred to as electrochromic materials, and devices made with electrochromic materials are referred to as electrochromic devices. Electrochromic materials are one of the hot spots of material science research in recent years. The electrochromic material is an important component in an electrochromic device and dominates the electrochromic performance of the device. Electrochromic materials can be classified into anodic electrochromic materials (ion-intercalation coloring) and cathodic electrochromic materials (ion-extraction coloring) according to the structural properties of the materials. The anode electrochromic material and the cathode electrochromic material can be assembled into a complementary electrochromic device, and the complementary device can improve the whole electrochromic performance such as optical contrast, color change, spectral absorption range and the like. Currently, the existing electrochromic display panel has the following problems:

1 theoretically, black can be obtained only by mixing CMY three inks in equal proportion, but the purity of the produced ink is not high enough due to the limitation of the current manufacturing process level, and the CMY addition result is actually only a dark red color;

2) the non-uniformity of the applied electric field is large, thereby affecting the dielectric strength of the dielectric; under the same other conditions, the more uneven the electric field is, the lower the dielectric strength of the dielectric is, and the other materials are likely to contact the dielectric layer to cause corrosion reaction.

Disclosure of Invention

The invention aims to provide an electrochromic display panel and electronic paper, which can display black and other colors, have uniform electric field distribution among transparent electrodes and have better display effect.

In order to achieve the purpose, the invention provides the following technical scheme: an electrochromic display panel comprises a first substrate, an electrochromic pixel array and a second substrate which are sequentially arranged, wherein the electrochromic pixel array comprises a plurality of array-arranged independently-controlled electrochromic units, each electrochromic unit comprises a black structure layer and a color structure layer, each black structure layer comprises a first electrode, a black electrochromic pixel layer and a second electrode, the first electrodes, the black electrochromic pixel layers and the second electrodes are arranged on the first substrate, each color structure layer comprises a plurality of cyan structure units (C), yellow structure units (Y) and magenta structure units (M), and the cyan structure units, the yellow structure units and the magenta structure units are longitudinally overlapped and arranged, and the color structure layers are arranged on one side of the black structure layers; the first electrode is provided with a first opposite surface opposite to the second electrode, the second electrode is provided with a second opposite surface opposite to the first electrode, and a plurality of micro-nano structures are arranged on the first opposite surface and/or the second opposite surface.

Furthermore, the structural unit comprises two electrodes which are oppositely arranged, and an ion storage layer, a conductive layer and a C or Y or M electrochromic pixel layer which are arranged between the two electrodes and are sequentially arranged.

Furthermore, the micro-nano structure is arranged on the electrode.

Further, the micro-nano structure is a concave-convex groove type structure.

Further, the widths of the groove shapes of the concave-convex groove type structure are the same or different; the depths of the groove types are the same or different; the shape of the groove is rectangular, trapezoidal or arc.

Further, the micro-nano structures are distributed periodically or non-periodically.

Further, the electrochromic display panel further comprises a white reflective layer disposed between the first substrate and the electrochromic pixel array.

Further, the electrochromic display panel further comprises an adhesive layer, wherein the adhesive layer is arranged between the white reflecting layer and the electrochromic pixel array, and the electrochromic pixel array is adhered to the white reflecting layer through the adhesive layer.

Further, the white reflective layer is formed of an adhesive polymer resin and white particles, and the electrochromic pixel array is adhered on the white reflective layer.

Furthermore, the black structure layer further comprises a first ion storage layer and a first conductive layer which are sequentially stacked and arranged between the first electrode and the black electrochromic pixel layer.

Furthermore, the ion storage layer and the first conductive layer are solid structures.

Further, an electrochromic material is arranged in the black electrochromic pixel layer, and the electrochromic material is selected from any one of an organic electrochromic material, an inorganic electrochromic material or a composite electrochromic material.

Further, an electrochromic material is arranged in the C, Y, M electrochromic pixel layer, and the electrochromic material is selected from any one of organic electrochromic materials, inorganic electrochromic materials or composite electrochromic materials.

Further, the organic electrochromic material is preferably any one or more of viologens, isophthalates, metal phthalocyanines, pyridine metal complexes, polyanilines, polypyrroles and polythiophenes.

The invention also provides electronic paper which comprises the electrochromic display panel.

Compared with the prior art, the invention has the beneficial effects that: the electrochromic display panel and the electronic paper are provided with an electrochromic pixel array between a first substrate and a second substrate, and a black structure layer and a color structure layer are arranged in the electrochromic pixel array. When the power is on, the black electrochromic layer becomes black, and when the power is off, the black electrochromic layer is transparent; the electrochromic display panel and the electronic paper display various colors except black through the color structure layer. In addition, the micro-nano structure is arranged on the first electrode and/or the second electrode in the electrochromic pixel array, so that the contact area of the micro-nano structure can be increased, the micro-nano structure has better electrochemical performance, the electric field between the two electrodes is more uniformly distributed, the conductive effect and the response speed of the micro-nano structure are enhanced, and the micro-nano structure is simple in structure and easy to prepare.

The electrochromic display panel and the electronic paper fix the electrochromic pixel array on the white reflecting layer in an adhesive mode, so that the stability and the smoothness of the structure are ensured, the phenomena such as Newton rings which are not beneficial to the display effect can be avoided or reduced, and the product quality is improved.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.

Drawings

FIG. 1 is a top view of an electrochromic display panel according to the invention;

FIGS. 2a and 2b are schematic diagrams of two structures of an electrochromic display panel according to the present invention;

fig. 3 and 4 are schematic structural diagrams of micro-nano structures in an electrochromic display panel according to the invention;

FIGS. 5 and 6 are schematic views of two other structures of an electrochromic display panel according to the present invention;

fig. 7 is a schematic structural diagram of an electrochromic display panel according to a first embodiment of the invention;

FIG. 8 is a schematic diagram of the structure of an electrochromic cell in the electrochromic display panel shown in FIG. 7;

fig. 9 is a schematic structural diagram of an electrochromic display panel according to a second embodiment of the invention;

fig. 10 is a schematic structural diagram of a black structure layer in the electrochromic display panel shown in fig. 9.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

It should be noted that: the terms "upper", "lower", "left", "right", "inner" and "outer" of the present invention are used for describing the present invention with reference to the drawings, and are not intended to be limiting terms.

Referring to fig. 1 and fig. 2a, in a vertical direction 10, the electrochromic display panel of the present invention includes a first substrate 1, an electrochromic pixel array 3, and a second substrate 4, which are sequentially disposed from bottom to top, the electrochromic pixel array 3 includes a plurality of electrochromic units 30 arranged in an array and independently controlled, the electrochromic units 30 include a black structure layer 31 and a color structure layer 32, and the black structure layer 31 includes a first electrode 311, a black electrochromic pixel layer (K)312, and a second electrode 313, which are sequentially disposed on the first substrate 1, in the vertical direction 10. When the power is turned on, the black structure layer 31 becomes black, and when the power is turned off, the black structure layer 31 is transparent. In order to display a color image, the color structure layer 32 includes a plurality of cyan structure units 321, magenta structure units 322, and yellow structure units 323 arranged in a longitudinal overlapping manner, the order of the layers can be adjusted, the color structure layer 32 is disposed on the upper side of the black structure layer 31, and the electrochromic display panel of the invention displays various colors except black through the color structure layer 32.

Referring to fig. 2b, the color structure layer 32 may also be disposed on the lower side of the black structure layer 31, and in the vertical direction 10, the electrochromic display panel shown in the present invention includes a first substrate 1, an electrochromic pixel array 3, and a second substrate 4, which are sequentially disposed from bottom to top, the electrochromic pixel array 3 includes a plurality of electrochromic units 30 arranged in an array and independently controlled, the electrochromic unit 30 includes the black structure layer 31 and the color structure layer 32, and the black structure layer 31 includes a first electrode 311, a black electrochromic pixel layer 312, and a second electrode 313, which are sequentially disposed on the color structure layer 32 in the vertical direction 10. When the power is turned on, the black structure layer 31 becomes black, and when the power is turned off, the black structure layer 31 is transparent. In order to display a color image, the color structure layer 32 includes a plurality of cyan structure units 321, magenta structure units 322, and yellow structure units 323 arranged in a longitudinal overlapping manner, the order of the layers can be adjusted, the color structure layer 32 is disposed between the first substrate 1 and the black structure layer 31, and the electrochromic display panel of the invention displays various colors except black through the color structure layer 32.

The black structure layer 31 can realize not only pure black display but also gray display.

Referring to fig. 3, the first electrode 31 has a first opposite surface 311 opposite to the second electrode 33, the second electrode 33 has a second opposite surface 331 opposite to the first electrode 31, and the first opposite surface 311 and/or the second opposite surface 331 are provided with a plurality of micro-nano structures 5. Here, the micro-nano structure 5 is provided on the second opposing surface 331 as an example, but the structure is not limited to this. And, the micro-nano structure 5 can be formed by a photolithography process, a laser etching process, a nano-imprinting process, and the like. The first electrode 31 and the second electrode 33 are generally rectangular or circular in shape, and the first electrode 31 and the second electrode 33 will be described as being rectangular in shape. In consideration of technical difficulty and cost, the micro-nano structure 5 is preferably an uneven groove type structure, and the uneven groove type structure 5 may be periodically or non-periodically distributed on the second electrode 33. Moreover, the groove shapes of the concave-convex groove-shaped structure 5 have the same or different widths; the depths of the groove shapes are the same or different; the shape of the groove is rectangular, trapezoidal or arc.

The groove-and-projection type structures 5 make the electric field distribution between the first electrode 31 and the second electrode 33 uniform when they are periodically distributed on the second opposite surface 331 of the second electrode 33. Alternatively, referring to fig. 4, since the electric field at the edge of the second electrode 33 is more easily distributed unevenly, the sub-concavo-convex groove-shaped structures 5 are distributed non-periodically on the second opposite surface 331 of the second electrode 33, and the distribution of the concavo-convex groove-shaped structures 5 near the edge of the second electrode 33 is tighter than the distribution near the center of the second electrode 33. Of course, the groove-and-projection type structure 5 may also be provided on the first electrode 31 alone, or on both the first electrode 31 and the second electrode 33. The first electrode 31 and the second electrode 33 may have a circular structure, and they are arranged in the same manner as described above, and will not be described again.

In the present invention, the black structure layer 31 is further provided with a solid first ion storage layer 314 and a first conductive layer 315, the first ion storage layer 314 is disposed on the first electrode 21, the first conductive layer 315 is disposed on the first ion storage layer 314, and the black electrochromic pixel layer 312 is disposed on the first conductive layer 315. Of course, referring to fig. 4, the cyan structural unit 321, the yellow structural unit 322, and the magenta structural unit 323 in the color structural layer 32 are similar to the black structural layer 31, and specifically, the cyan structural unit 321 includes a third electrode 3211, a second ion storage layer 3212, a second conductive layer 3213, a cyan electrochromic pixel layer 3214, and a fourth electrode 3215 sequentially disposed from bottom to top; the magenta color constitutional unit 322 includes a fifth electrode 3221, a third ion storage layer 3222, a third conductive layer 3223, a magenta color electrochromic pixel layer 3224, and a sixth electrode 3225, which are arranged in this order from bottom to top; the yellow structure unit 323 includes a seventh electrode 3231, a fourth ion storage layer 3232, a fourth conductive layer 3233, a yellow electrochromic pixel layer 3234, and an eighth electrode 3235, which are sequentially disposed from bottom to top. The micro-nano structure 5 may be provided on any one or more of the third electrode 3211, the fourth electrode 3215, the fifth electrode 3221, the sixth electrode 3225, the seventh electrode 3231, and the eighth electrode 3235, which will not be described herein.

Referring to fig. 5, in the present invention, the white reflective layer 2 may be further disposed to enhance the color development effect. Specifically, the white reflective layer 2 is disposed between the first substrate 1 and the electrochromic pixel array 3. The white reflective layer 2 is formed of a polymer resin selected from any one of phenol resin, epoxy resin, polyamide resin, polyurethane resin or acrylic resin, and white particles selected from any one or more of alumina, zinc oxide, titanium oxide or silica. The black structure layer 31 and the color structure layer 32 are solid structures, and when the white reflective layer 2 has no viscosity, the electrochromic pixel array 3 can be adhered to the white reflective layer 2 by disposing the adhesive layer 21 between the white reflective layer 2 and the electrochromic pixel array 3, as shown in fig. 6. The thickness of the white reflective layer 2 is preferably 1 to 40 μm, and the thickness of the adhesive layer 21 is preferably 1 to 40 μm. When the white reflective layer 2 is adhesive, i.e. a viscous polymer resin is selected, the electrochromic pixel array 3 may be directly adhered to the white reflective layer 2, wherein the thickness of the white reflective layer 2 is preferably 10-70 μm. Through the arrangement, the packaging step of the liquid electrochromic material is omitted, the phenomena that the electrode above the gap collapses and liquid leakage easily occurs due to pressure difference are avoided, the stability and the flatness of the electrochromic display panel with the structure are ensured, and the phenomena that Newton rings and the like are not beneficial to the display effect can be avoided or reduced.

In the present invention, the black electrochromic pixel layer 312, the cyan electrochromic pixel layer 3214, the magenta electrochromic pixel layer 3224, and the yellow electrochromic pixel layer 3234 are provided with electrochromic materials selected from any one of organic electrochromic materials, inorganic electrochromic materials, or composite electrochromic materials, wherein the inorganic electrochromic materials include metal oxides, preferably tungsten trioxide and nickel oxide; the organic electrochromic material is preferably any one or more of viologens, isophthalates, metal phthalocyanines, pyridine metal complexes, polyanilines, polypyrroles and polythiophenes, and can be prepared by methods such as sputtering, chemical vapor deposition, sol-gel or evaporation, or can be prepared by drying and curing a liquid electrochromic material. In the present invention, the first substrate 1 and the second substrate 4 are transparent substrates, and the first electrode 31, the second electrode 33, the third electrode 3211, the fourth electrode 3215, the fifth electrode 3221, the sixth electrode 3225, the seventh electrode 3231, and the eighth electrode 3235 are transparent electrodes, and have a linear structure or a planar structure, preferably a mesh structure. The electrode structure in the present invention is preferably a transparent electrode selected from any one of Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), or a conductive polymer. The first substrate 1 and the second substrate 4 may be transparent inorganic substrates, such as quartz or glass, or may be transparent plastics, or may be other commonly used transparent materials.

The invention also provides an electronic paper (not shown) comprising the electrochromic display panel, and other structures are all in the prior art and will not be described herein.

The present invention will be described in further detail with reference to specific examples.

Example one

Referring to fig. 7 and 8, the electrochromic display panel of the present embodiment includes a first substrate 1-1, a white reflective layer 1-2, an adhesive layer 1-21, an electrochromic pixel array 1-3, and a second substrate 1-4, which are sequentially disposed from bottom to top, wherein the electrochromic pixel array 1-3 includes a plurality of electrochromic units 1-30 arranged in an array and independently controlled, and each of the electrochromic units 1-30 includes a black structure layer 1-31 and a color structure layer 1-32. The black structure layer 1-31 comprises a first transparent electrode 1-311, a first ion storage layer 1-312, a first conductive layer 1-313, a black electrochromic pixel layer 1-314 and a second transparent electrode 1-315 which are arranged from bottom to top in sequence, wherein the first transparent electrode 1-311 is adhered to the white reflecting layer 1-2 through an adhesive layer 1-21. The black structure layer 1-31 is adhered to the white reflection layer 1-2 through the adhesive layer 1-21, the black electrochromic pixel layer 1-314 contains black electrochromic materials, when the black structure layer is electrified, the black electrochromic pixel layer 1-314 becomes black, and when the black structure layer is powered off, the black electrochromic pixel layer 1-314 is transparent. The color structure layer 1-32 includes a plurality of cyan structure units 1-321, yellow structure units 1-322, and magenta structure units 1-323 arranged in a vertically stacked manner, and the electrochromic display panel of the embodiment displays various colors except black through the color structure layer 1-31.

The cyan structural unit 1-321 of the present embodiment includes a third transparent electrode 1-3211, a second ion storage layer 1-3212, a second conductive layer 1-3213, a cyan electrochromic pixel layer 1-3214, and a fourth transparent electrode 1-3215, which are sequentially disposed from bottom to top; the yellow structure unit 1-322 comprises fifth transparent electrodes 1-3221, third ion storage layers 1-3222, third conducting layers 1-3223, yellow electrochromic pixel layers 1-3224 and sixth transparent electrodes 1-3225 which are arranged from bottom to top in sequence; the magenta structural unit 1-323 comprises a seventh transparent electrode 1-3231, a fourth ion storage layer 1-3232, a fourth conductive layer 1-3233, a magenta electrochromic pixel layer 1-3234 and an eighth transparent electrode 1-3235 which are arranged in sequence from bottom to top. In this embodiment, the structural order of the layers in the color structural layers 1-32 is cyan structural units 1-321, yellow structural units 1-322 and magenta structural units 1-323 from bottom to top, but in other embodiments, the order may be changed according to actual needs.

In this embodiment, the first transparent electrode 1-311 has a first opposing surface 1-3111 opposing the second transparent electrode 1-315, the second transparent electrode 1-315 has a second opposing surface 1-3151 opposing the first transparent electrode 1-311, the third transparent electrode 1-3211 has a third opposing surface 1-3210 opposing the fourth transparent electrode 1-3215, the fourth transparent electrode 1-3215 has a fourth opposing surface 1-3216 opposing the first transparent electrode 1-3211, the fifth transparent electrode 1-3221 has a fifth opposing surface 1-3220 opposing the sixth transparent electrode 1-3225, the sixth transparent electrode 1-3225 has a sixth opposing surface 1-3226 opposing the fifth transparent electrode 1-3221, the seventh transparent electrode 1-3231 has a seventh opposing surface 1-3230 opposing the eighth transparent electrode 1-3235, the eighth transparent electrode 1-3235 has an eighth opposite surface 1-3236 opposite to the seventh transparent electrode 1-3231. In order to make the electric field distribution in the black structure layer 1-31 and the color structure layer 1-32 more uniform, the present embodiment provides a plurality of groove-and-projection type structures 1-5 on the first facing surface 1-3111, the second facing surface 1-3151, the third facing surface 1-3211, the fourth facing surface 1-3251, the fifth facing surface 1-3220, the sixth facing surface 1-3226, the seventh facing surface 1-3230, and the eighth facing surface 1-3236, and the groove-and-projection type structures 1-5 are more closely distributed at the edges near the electrodes. By the arrangement, the electric field boundary effect can be avoided, and the electric field distribution is more uniform. Moreover, the groove shapes of the concave-convex groove type structures 1-5 have the same width and depth; the shape of the groove is rectangular. In this embodiment, the first transparent electrodes 1 to 311, the second transparent electrodes 1 to 315, the third transparent electrodes 1 to 3211, the fourth transparent electrodes 1 to 3215, the fifth transparent electrodes 1 to 3221, the sixth transparent electrodes 1 to 3225, the seventh transparent electrodes 1 to 3231, and the eighth transparent electrodes 1 to 3235 are all rectangular structures, and indeed, in other embodiments, they may also be circular structures. In this embodiment, the groove-and-projection structure 1-5 is disposed on the first transparent electrode 1-311, the second transparent electrode 1-315, the third transparent electrode 1-3211, the fourth transparent electrode 1-3215, the fifth transparent electrode 1-3221, the sixth transparent electrode 1-3225, the seventh transparent electrode 1-3231 and the eighth transparent electrode 1-3235, and indeed in other embodiments, the groove-and-projection structure 1-5 may also be disposed on the first transparent electrode 1-311, the second transparent electrode 1-315, the third transparent electrode 1-3211, the fourth transparent electrode 1-3215, the fifth transparent electrode 1-3221, the sixth transparent electrode 1-3225, the seventh transparent electrode 1-3231 or the eighth transparent electrode 1-3235, or on the first transparent electrode 1-311, the second transparent electrode 1-315, the third transparent electrode 1-3225, the seventh transparent electrode 1-3231 or the eighth transparent electrode 1-3235, or, Any two or more than two of the second transparent electrodes 1-315, the third transparent electrodes 1-3211, the fourth transparent electrodes 1-3215, the fifth transparent electrodes 1-3221, the sixth transparent electrodes 1-3225, the seventh transparent electrodes 1-3231 or the eighth transparent electrodes 1-3235 are arranged.

In the present embodiment, the black structure layer 1-31 and the color structure layer 1-32 are both solid structures. The white reflective layer 1-2 is composed of a phenol resin and dispersed titanium oxide, and is disposed on the first substrate 1-1 by spin coating. The thickness of the white reflective layer 1-2 was 20 μm, and the thickness of the adhesive layer 1-21 was 15 μm. By providing the adhesive layers 1-21, a better adhesion effect can be achieved than by adhering the first transparent electrodes 1-31 with an adhesive white reflective layer, so that the electrochromic pixel arrays 1-3 are more stably fixed on the white reflective layers 1-2.

Example two

Referring to fig. 9 and 10, the electrochromic display panel of the present embodiment includes a first substrate 2-1, a white reflective layer 2-2, an adhesive layer 2-21, an electrochromic pixel array 2-3, and a second substrate 2-4, which are sequentially disposed from bottom to top, where the electrochromic pixel array 2-3 includes a plurality of electrochromic units arranged in an array and independently controlled, and the electrochromic units include a black structure layer 2-31 and a color structure layer 2-32. The color structure layer 2-32 is adhered to the white reflection layer 2-2 through an adhesive layer 2-21, and comprises a plurality of cyan structure units 2-321, magenta structure units 2-322 and yellow structure units 2-323 which are longitudinally overlapped, and the electrochromic display panel of the embodiment displays various colors except black through the color structure layer 2-31. The black structure layer 2-31 comprises a first transparent electrode 2-311, a first ion storage layer 2-312, a first conductive layer 2-313, a black electrochromic pixel layer 2-314 and a second transparent electrode 2-315 which are arranged from bottom to top, and the first transparent electrode 2-311 is arranged on the color structure layer 2-32. The black structure layer 2-31 is adhered to the white reflection layer 2-2 through the adhesive layer 2-21, the black electrochromic pixel layer contains black electrochromic materials, when the black structure layer is electrified, the black electrochromic pixel layer 2-314 becomes black, and when the black structure layer is powered off, the black electrochromic pixel layer is transparent. The first transparent electrode 2-311 has a first opposite surface 2-3111 opposite to the second transparent electrode 2-315, the second transparent electrode 2-315 has a second opposite surface 2-3151 opposite to the first transparent electrode 2-311, in order to make the electric field distribution between the first transparent electrode 2-311 and the second transparent electrode 2-315 more uniform, in this embodiment, a plurality of periodically distributed concave-convex groove type structures 2-5 are arranged on the first opposite surface 2-3111 and the second opposite surface 2-3151, and the concave-convex groove type structures 2-5 are uniformly distributed on the second transparent electrode 2-315.

In this embodiment, the structural order of the layers in the color structural layers 2-32 is cyan structural unit 2-321, magenta structural unit 2-322 and yellow structural unit 2-323 from bottom to top, but in other embodiments, the order may be changed according to actual needs. The micro-nano structures 2-5 are also arranged on the electrodes in the cyan structural unit 2-321, the magenta structural unit 2-322 and the yellow structural unit 2-323, and the arrangement mode is the same as that of the first transparent electrode 2-311 and the second transparent electrode 2-315, and the description is not repeated here.

EXAMPLE III

The electrochromic display panel of this embodiment has substantially the same structure as the first embodiment, except that the present embodiment does not provide an adhesive layer, and the electrochromic pixel array is adhered by using a white reflective layer having adhesiveness, which has a simpler structure and is easier to manufacture. In this embodiment, the thickness of the white reflective layer is 45 μm.

In summary, the following steps: the electrochromic display panel and the electronic paper are provided with the electrochromic pixel array between the first substrate and the second substrate, and the electrochromic pixel array is provided with the black structure layer and the color structure layer. When the power is on, the black electrochromic layer becomes black, and when the power is off, the black electrochromic layer is transparent; the electrochromic display panel and the electronic paper display various colors except black through the color structure layer. In addition, the micro-nano structure is arranged on the first electrode and/or the second electrode in the electrochromic pixel array, so that the contact area of the micro-nano structure can be increased, the micro-nano structure has better electrochemical performance, the electric field between the two electrodes is more uniformly distributed, the conductive effect and the response speed of the micro-nano structure are enhanced, and the micro-nano structure is simple in structure and easy to prepare.

The electrochromic display panel and the electronic paper fix the electrochromic pixel array on the white reflecting layer in an adhesive mode, so that the stability and the smoothness of the structure are ensured, the phenomena such as Newton rings which are not beneficial to the display effect can be avoided or reduced, and the product quality is improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (15)

1. An electrochromic display panel is characterized by comprising a first substrate, an electrochromic pixel array and a second substrate which are sequentially arranged, wherein the electrochromic pixel array comprises a plurality of array-arranged independently-controlled electrochromic units, each electrochromic unit comprises a black structure layer and a color structure layer, each black structure layer comprises a first electrode, a black electrochromic pixel layer and a second electrode which are arranged on the first substrate, each color structure layer comprises a plurality of cyan structure units (C), yellow structure units (Y) and magenta structure units (M) which are longitudinally overlapped and arranged, and each color structure layer is arranged on one side of the corresponding black structure layer; the first electrode is provided with a first opposite surface opposite to the second electrode, the second electrode is provided with a second opposite surface opposite to the first electrode, and a plurality of micro-nano structures are arranged on the first opposite surface and/or the second opposite surface.

2. The electrochromic display panel according to claim 1, wherein the structural unit comprises two electrodes disposed opposite to each other and an ion storage layer, a conductive layer, a C or Y or M electrochromic pixel layer disposed between the two electrodes in this order.

3. The electrochromic display panel according to claim 2, wherein said micro-nano structure is provided on said electrode.

4. The electrochromic display panel according to claim 1 or 3, wherein the micro-nano structure is a groove-and-projection type structure.

5. The electrochromic display panel according to claim 4, wherein the widths of the groove types of the concavo-convex groove type structure are the same or different; the depths of the groove types are the same or different; the shape of the groove is rectangular, trapezoidal or arc.

6. The electrochromic display panel of claim 1 wherein said micro-nano structures are in a periodic or aperiodic distribution.

7. The electrochromic display panel of claim 1 further comprising a white reflective layer disposed between said first substrate and said electrochromic pixel array.

8. The electrochromic display panel of claim 7 further comprising an adhesive layer disposed between said white reflective layer and an electrochromic pixel array, said electrochromic pixel array adhered to said white reflective layer by said adhesive layer.

9. The electrochromic display panel of claim 7 wherein said white reflective layer is formed of an adhesive polymer resin and white particles, said electrochromic pixel array being adhered to said white reflective layer.

10. The electrochromic display panel according to claim 1, wherein the black structure layer further comprises a first ion storage layer and a first conductive layer which are sequentially stacked and disposed between the first electrode and the black electrochromic pixel layer.

11. The electrochromic display panel according to claim 10, wherein said one ion storage layer and said first conductive layer are solid state structures.

12. The electrochromic display panel according to claim 1, wherein an electrochromic material is provided in the black electrochromic pixel layer, and the electrochromic material is selected from any one of organic electrochromic materials, inorganic electrochromic materials, and composite electrochromic materials.

13. The electrochromic display panel according to claim 2, wherein an electrochromic material is provided in the C, Y, M electrochromic pixel layer, and the electrochromic material is selected from any one of organic electrochromic material, inorganic electrochromic material and composite electrochromic material.

14. The electrochromic display panel according to claim 12 or 13 wherein said organic electrochromic material is preferably any one or more of viologens, isophthalates, metal phthalocyanines, pyridine based metal complexes, polyanilines, polypyrroles, polythiophenes.

15. An electronic paper characterized by comprising the electrochromic display panel according to any one of claims 1 to 14.

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