CN212484031U - Electrochromic display panel and electronic paper - Google Patents

Abstract

The utility model relates to an electrochromic display panel and electronic paper, including the first base plate that sets gradually, electrochromic pixel array and second base plate, electrochromic pixel array includes that a plurality of arrays arrange, independent control's electrochromic unit, electrochromic unit include black structural layer and colored structural layer, and first electrode has the first opposite face relative with the second electrode, and the second electrode has the second opposite face relative with first electrode, is equipped with uneven face on first opposite face and/or the second opposite face. The electrochromic display panel and the electronic paper can display black and other colors, are rich in display colors, are provided with uneven surfaces on electrodes in an electrochromic pixel array, and enable electric fields between the two electrodes to be distributed more uniformly, so that the conductivity effect of the electrochromic display panel and the color changing effect of a color changing layer are enhanced, the electrochromic display panel is simple in structure and easy to prepare, the production cost is saved, and the product quality is improved.

Description

Electrochromic display panel and electronic paper

Technical Field

The utility model relates to an electrochromic display panel and electronic paper belongs to and shows technical field.

Background

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 integral electrochromic performance such as optical contrast, color change, spectral absorption range and the like. At present, the existing electrochromic display panel and electronic paper have the following problems:

1) the electrochromic layer is often formed by injecting a liquid electrochromic material into the gap, so that the electrode above the gap is easy to collapse due to pressure difference, the packaging difficulty is high, the liquid leakage phenomenon is easy to occur, and the quality of the electrochromic display panel is seriously influenced;

2) the pure black cannot be displayed, or the device displaying the pure black has a complex structure and a slow response speed.

3) The non-uniformity of the applied electric field is large, thereby affecting the dielectric strength of the dielectric;

4) 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.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electrochromic display panel and electronic paper, it can show black, can show other colours again, has abundant display effect to electric field distribution is even between the electrode, has the display effect of preferred, and simple structure, easily preparation.

In order to achieve the above purpose, the utility model provides a 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 arrangements and 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 sequentially arranged, each color structure layer comprises a plurality of red, green and blue optical filters which are horizontally arranged in a transverse mode, and each color structure layer is arranged on one side of each 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 uneven surfaces are arranged on the first opposite surface and/or the second opposite surface.

Further, the uneven surface is selected from any one of an arc surface, a wave surface, a slope surface or a wedge surface.

Further, the uneven surface is selected from any combination of an arc surface, a wave surface, a slope surface, a wedge surface and a plane surface.

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.

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

Further, the conductive layer and the ion storage layer are solid structures.

Further, the first electrode and/or the second electrode are transparent electrodes.

Further, an electrochromic material is arranged in the black structure 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, the inorganic electrochromic material comprises metal oxide, preferably tungsten trioxide and nickel oxide.

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

The utility model also provides an electronic paper, it includes foretell electrochromic display panel.

The beneficial effects of the utility model reside in that: the utility model discloses an electrochromic display panel and electronic paper are equipped with electrochromic pixel array between first base plate and second base plate, are provided with black structural layer and color structure layer in 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 color structure layer comprises a plurality of red, green and blue filters which are horizontally arranged in the transverse direction, and the electrochromic display panel displays various colors except black through the color structure layer. Therefore, the electrochromic display panel can display black and other colors, is rich in display color, and is provided with uneven surfaces on the electrodes in the electrochromic pixel array, so that the electric field between the two electrodes is more uniformly distributed, the conductivity effect is enhanced, the color change effect of the color change layer is accelerated, and the electrochromic display panel 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 a bonding mode, so that the packaging step of a liquid electrochromic material is omitted, the phenomena that an electrode above a gap collapses and is easy to leak due to pressure difference are avoided, the production cost is saved, and the product quality is improved.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

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

fig. 2a, 2b, 3 and 4 are schematic structural diagrams of an electrochromic display panel according to the present invention;

fig. 5 to 7 are schematic structural diagrams of uneven surfaces in the electrochromic display panel according to the present invention;

fig. 8 is a schematic structural diagram of an electrochromic display panel according to a first embodiment of the present invention;

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

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to 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.

Referring to fig. 1 and fig. 2a, in the 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 array arrangements, an independently controlled electrochromic unit 30, the electrochromic unit 30 includes a black structure layer 31 and a color structure layer 32, 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. The color structure layer 32 is disposed between the first substrate 1 and the first electrode 311, in order to display a color image, the color structure layer 32 includes a plurality of color filters 321 including a plurality of red, green, and blue filters horizontally arranged, and the electrochromic display panel can display various colors except black through the color structure layer 32. Wherein the first electrode 311 has a first opposite surface 3111 opposite to the second electrode 313, the second electrode 313 has a second opposite surface 3131 opposite to the first electrode 311, and uneven surfaces are provided on the first opposite surface 3111 and/or the second opposite surface 3131.

Please refer to fig. 2b, the color structure layer 32 can be further disposed between the black electrochromic pixel layer 312 and the second electrode 313, in the vertical direction 10, the electrochromic display panel of the present invention includes, from bottom to top, the first substrate 1, the electrochromic pixel array 3 and the second substrate 4 which are disposed in sequence, the electrochromic pixel array 3 includes a plurality of arrays, the independently controlled electrochromic unit 30, the electrochromic unit 30 includes the black structure layer 31 and the color structure layer 32, the black structure layer 31 includes, in the vertical direction 10, the first electrode 311, the black electrochromic pixel layer 312 and the second electrode 313 which are disposed on the first substrate 1 in sequence. 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. The color structure layer 32 is disposed between the second electrode 313 and the second substrate 3, and in order to display a color image, the color structure layer 32 includes a plurality of color filters 321 including a plurality of red, green, and blue filters horizontally arranged, and the electrochromic display panel can display various colors except black through the color structure layer 32. Wherein the first electrode 311 has a first opposite surface 3111 opposite to the second electrode 313, the second electrode 313 has a second opposite surface 3131 opposite to the first electrode 311, and uneven surfaces are provided on the first opposite surface 3111 and/or the second opposite surface 3131.

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

The black structure layer 31 is further provided with a solid ion storage layer 314 and a conductive layer 315, the ion storage layer 315 is disposed on the first electrode 311, the conductive layer 315 is disposed on the ion storage layer 314, and the black electrochromic pixel layer 312 is disposed on the conductive layer 315.

In the present invention, the color of the color filter 321 is selected from red, green and blue, and the color of the color filter 321 in any two adjacent pixel units is different. It should be noted that the color structure layer 32 may be disposed on the black electrochromic pixel layer 312 and the conductive layer 315, or disposed between the black electrochromic pixel layer 312 and the second electrode 313. And the color filters 321 in each pixel unit are arranged at intervals corresponding to the black electrochromic pixel layers 312 of each pixel unit. In order to avoid the color crosstalk of each pixel unit when the electrochromic display panel of the present invention performs color display, a pixel partition wall (not shown) is further provided between the first substrate 1 and the second substrate 4 for dividing the pixel units.

Please refer to fig. 3, in the present invention, the white reflective layer 2 can be further disposed to enhance the color effect. The white reflective layer 2 is formed of a polymer resin which may be selected from any one including a phenol resin, an epoxy resin, a polyamide resin, a polyurethane resin or an acrylic resin, and white particles which may be selected from any one or more of aluminum oxide, zinc oxide, titanium oxide or silicon dioxide. The black electrochromic layer 32 is a solid electrochromic layer, and when the white reflective layer 2 has no adhesiveness, the electrochromic pixel array 3 may be adhered on the white reflective layer 2 by disposing an adhesive layer 21 between the white reflective layer 2 and the electrochromic pixel array 3 as shown in fig. 4, wherein 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 utility model, the uneven surface is selected from any one of an arc surface, a wave surface, a slope surface or a wedge surface, preferably the arc surface and the wave surface; or the uneven surface is selected from any combination of an arc surface, a wave surface, a slope surface, a wedge surface and a plane surface.

Referring to fig. 5 to fig. 7 (which are illustrated with reference to the views of the first electrode 311), since the electric field boundary effect is usually generated at the electrode boundary, in order to achieve the best effect of the electric field distribution between the first electrode 311 and the second electrode 313, the first opposite surface 3111 and/or the second opposite surface 3131 are provided with an arc surface, a wave surface, or a combination of the wave surface and a plane line. The two opposing surfaces may be mirror images, however, only one of the first opposing surface 3111 and the second opposing surface 3131 may be provided with an arcuate surface, a wavy surface, or a combination of wavy and planar surfaces. In the present invention, the first opposite surface 3111 and/or the second opposite surface 3131 may further have a slope surface or a wedge surface thereon, or an arc surface, a wave surface, a slope surface, a wedge surface and a plane surface, but considering the manufacturing difficulty and cost, it is preferable to adopt the combination of the arc surface or the wave surface and the plane line to set up. As shown in fig. 7, the distribution of the wavy surface near the edge of the first electrode 31 or the second electrode 33 can be made tighter than the distribution near the center of the first electrode 311 or the second electrode 313, so as to better reduce the influence caused by the electric field boundary effect.

The black electrochromic black sub-pixel layer 312 of the present invention is provided with an electrochromic material therein, which is selected from any one of organic electrochromic material, inorganic electrochromic material or composite electrochromic material, wherein the inorganic electrochromic material includes metal oxide, preferably tungsten trioxide or 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 and the second electrode 33 are transparent electrodes, wherein the first electrode 31 and the second electrode 33 are linear structures or planar structures, preferably mesh structures. The first electrode 31 and the second electrode 33 of the present invention are preferably transparent electrodes selected from any one of Indium Tin Oxide (ITO), fluorine-doped tin oxide (FTO), or conductive polymers. 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 present invention will be described in further detail with reference to specific embodiments.

Example one

Referring to fig. 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 1-5, which are sequentially disposed from bottom to top, where the electrochromic pixel array 1-3 includes a plurality of electrochromic units arranged in an array and independently controlled, and each electrochromic unit 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, an ion storage layer 1-312, a conductive layer 1-313, a black electrochromic pixel layer 1-314 and a second transparent electrode 1-315 which are sequentially arranged from bottom to top. Wherein the first transparent electrode 1-311 has a first opposite surface 1-3111 opposite to the second transparent electrode 1-315, and the second transparent electrode 1-315 has a second opposite surface 1-3151 opposite to the first transparent electrode 1-311, in order to make the electric field distribution between the first transparent electrode 1-311 and the second transparent electrode 1-315 more uniform, the present embodiment provides an arc-shaped surface on the first opposite surface 1-3111 and the second opposite surface 1-3151. The first transparent electrode 1-31 is arranged on the color structure layer 1-32, the black electrochromic pixel layer 1-314 contains a plurality of electrochromic black sub-pixel units, when the power is on, the black electrochromic layer 1-314 becomes black, and when the power is off, the black electrochromic layer 1-34 is transparent. The color structure layer 1-32 is adhered to the white reflection layer 1-2 through the adhesive layer 1-21, and includes a plurality of RGB color filters 1-321 horizontally arranged in a transverse direction, and the RGB color filters 1-321 of each unit and the black electrochromic pixel layers 1-314 of each unit are arranged at intervals in a one-to-one correspondence manner, so that the electrochromic display panel of the embodiment realizes color display.

In the present embodiment, the black structure layer 1-31 and the color structure layer 1-32 are both solid structures, and 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 layer 1-21, a better adhesion effect can be achieved than by adhering the first transparent electrode 1-131 with the white reflective layer 1-2 having adhesiveness or by directly disposing the first transparent electrode 1-311 on the white reflective layer 1-2, so that the electrochromic pixel array 1-3 is more stably fixed on the white reflective layer 1-2.

Example two

Referring to fig. 9, 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 2-5, 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 each electrochromic unit includes a black structure layer 2-31 and a color structure layer 2-32. The black structure layer 2-31 comprises a first transparent electrode 2-311, an ion storage layer 2-312, a conductive layer 2-313, a black electrochromic pixel layer 2-314 and a second transparent electrode 2-315 which are sequentially arranged from bottom to top. The first transparent electrode 2-31 is adhered to the white reflecting layer 2-2 through an adhesive layer 2-21, the black electrochromic pixel layer 2-314 contains a plurality of electrochromic black sub-pixel units, when the black electrochromic pixel layer 2-314 is electrified, the black electrochromic layer 2-314 becomes black, and when the black electrochromic pixel layer 2-34 is powered off, the black electrochromic layer is transparent. The color structure layer 2-32 is disposed between the second electrode 2-315 and the second substrate 2-5, and includes a plurality of RGB color filters 2-321 horizontally arranged in a transverse direction, and the RGB color filters 2-321 of each unit and the black electrochromic pixel layers 2-314 of each unit are disposed at intervals in a one-to-one correspondence manner, so that the electrochromic display panel of the embodiment implements color display. Wherein the first transparent electrode 2-311 has a first opposite surface 2-3111 opposite to the second transparent electrode 2-315, and 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, the present embodiment provides an arc surface on the first opposite surface 2-3111 and the second opposite surface 2-3151.

In the present embodiment, the color structure layer 2-3 and the black electrochromic layer 2-35 are solid structures, and the white reflective layer 2-2 is composed of a phenol resin and dispersed titanium oxide, and is disposed on the first substrate 2-1 by a spin coating method. The thickness of the white reflective layer 2-2 was 18 μm, and the thickness of the adhesive layer 2-21 was 17 μm.

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.

Example four

The electrochromic display panel of this embodiment has substantially the same structure as the first embodiment, except that the present embodiment of this embodiment has a wavy surface on the first opposing surface and the second opposing surface.

In summary, the following steps: the utility model discloses an electrochromic display panel and electronic paper are equipped with electrochromic pixel array between first base plate and second base plate, are provided with black structural layer and color structure layer in 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 color structure layer comprises a plurality of red, green and blue filters which are horizontally arranged in the transverse direction, and the electrochromic display panel displays various colors except black through the color structure layer. Therefore, the electrochromic display panel can display black and other colors, is rich in display color, and is provided with uneven surfaces on the electrodes in the electrochromic pixel array, so that the electric field between the two electrodes is more uniformly distributed, the conductivity effect is enhanced, the color change effect of the color change layer is accelerated, and the electrochromic display panel 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 a bonding mode, so that the packaging step of a liquid electrochromic material is omitted, the phenomena that an electrode above a gap collapses and is easy to leak due to pressure difference are avoided, the production cost is saved, 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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (11)

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 arrangements and 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 sequentially arranged, each color structure layer comprises a plurality of red, green and blue optical filters which are horizontally arranged in a transverse direction, and each color structure layer is arranged on one side of the 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 uneven surfaces are arranged on the first opposite surface and/or the second opposite surface.

2. The electrochromic display panel according to claim 1 wherein said uneven surface is selected from any one of an arc-shaped surface, a wavy surface, and a sloped surface.

3. The electrochromic display panel of claim 1 wherein said uneven surface is selected from the group consisting of an arcuate surface, a wavy surface, a sloped surface and a planar surface in any combination.

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

5. The electrochromic display panel of claim 4 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.

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

7. The electrochromic display panel of claim 6 wherein said conductive layer and ion storage layer are solid state structures.

8. The electrochromic display panel according to claim 1, wherein the first electrode and/or the second electrode is a transparent electrode.

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

10. The electrochromic display panel according to claim 9 wherein said inorganic electrochromic material comprises a metal oxide, said metal oxide being tungsten trioxide or nickel oxide.

11. An electronic paper characterized by comprising the electrochromic display panel according to any one of claims 1 to 10.

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