Electrochromic display panels and electronic paper

Abstract

The present invention relates to an electrochromic display panel and electronic paper. The electrochromic display panel includes a first substrate, an electrochromic pixel array, and a second substrate, which are arranged in sequence. The electrochromic pixel array includes a plurality of independently controlled electrochromic units arranged in an array. The electrochromic units include a black structural layer and a color structural layer. The black structural layer includes a first electrode, a black electrochromic pixel layer, and a second electrode, which are arranged in sequence. The color structural layer includes a plurality of red, green, and blue filters arranged horizontally, and the color structural layer is arranged on one side of the black structural layer. The first electrode has a first opposing surface opposite to the second electrode, and the second electrode has a second opposing surface opposite to the first electrode. A plurality of micro-nano structures are provided on the first opposing surface and / or the second opposing surface. The electrochromic display panel and electronic paper can display both black and other colors, and the electric field distribution between the transparent electrodes is uniform, thereby providing an excellent display effect.

Description

Technical Field

[0001] The present invention relates to an electrochromic display panel and electronic paper, belonging to the field of display technology. Background Art

[0002] Electrochromism (EC) refers to the phenomenon that the optical properties of a material (reflectivity, transmittance, absorptivity, etc.) undergo stable and reversible color changes under the action of an external electric field, which manifests itself in appearance as reversible changes in color and transparency. Materials with electrochromic properties are called electrochromic materials, and devices made of electrochromic materials are called electrochromic devices. Electrochromic materials are one of the hot topics in materials science research in recent years. Electrochromic materials are an important component of electrochromic devices and dominate the electrochromic properties of the devices. According to the structural properties of the materials, electrochromic materials can be divided into anode electrochromic materials (ion embedding coloring) and cathode electrochromic materials (ion extraction coloring). Anode electrochromic materials and cathode electrochromic materials can be assembled into complementary electrochromic devices. Such complementary devices can improve the overall electrochromic performance, such as optical contrast, color change, spectral absorption range, etc. At present, existing electrochromic display panels have the following problems:

[0003] 1) The electrochromic layer is often formed by injecting liquid electrochromic material into the gap, which can easily cause the electrode above the gap to collapse due to pressure difference. Furthermore, its packaging is difficult and prone to leakage, seriously affecting the quality of the electrochromic display panel.

[0004] 2) Often, pure black cannot be displayed, or the device that displays pure black has a complex structure and slow response speed;

[0005] 3) The applied electric field is highly non-uniform, thus affecting the dielectric strength of the dielectric. Under the same other conditions, the more non-uniform the electric field, the lower the dielectric strength, making it easier for other materials to come into contact with the dielectric layer, resulting in corrosion reactions. Summary of the Invention

[0006] The object of the present invention is to provide an electrochromic display panel and electronic paper, which can display both black and other colors, and has a uniform electric field distribution between its transparent electrodes, thereby having a better display effect.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an electrochromic display panel, comprising a first substrate, an electrochromic pixel array, and a second substrate arranged in sequence, the electrochromic pixel array comprising a plurality of array-arranged, independently controlled electrochromic units, the electrochromic units comprising a black structural layer and a color structural layer, the black structural layer comprising a first electrode, a black electrochromic pixel layer, and a second electrode arranged in sequence, the color structural layer comprising a plurality of red, green, and blue filters arranged horizontally, the color structural layer being arranged on one side of the black structural layer; the first electrode having a first opposing surface opposite to the second electrode, the second electrode having a second opposing surface opposite to the first electrode, and a plurality of micro-nano structures being provided on the first opposing surface and / or the second opposing surface.

[0008] Furthermore, the micro-nano structure is a concave-convex groove structure.

[0009] Furthermore, the groove widths of the concave-convex groove structure are the same or different; the groove depths are the same or different; and the groove shape is rectangular, trapezoidal, or arc-shaped.

[0010] Furthermore, the micro-nano structures are distributed periodically or non-periodically.

[0011] Furthermore, the electrochromic display panel further includes a white reflective layer, and the white reflective layer is disposed between the first substrate and the electrochromic pixel array.

[0012] Furthermore, the electrochromic display panel further includes an adhesive layer, which is disposed between the white reflective layer and the electrochromic pixel array, and the electrochromic pixel array is adhered to the white reflective layer through the adhesive layer.

[0013] Furthermore, the white reflective layer is formed of a viscous polymer resin and white particles, and the electrochromic pixel array is adhered to the white reflective layer.

[0014] Furthermore, the black structure layer further includes an ion storage layer and a conductive layer stacked in sequence and arranged between the first electrode and the electrochromic layer.

[0015] Furthermore, the conductive layer and the ion storage layer are solid structures.

[0016] Furthermore, the first electrode and / or the second electrode is a transparent electrode.

[0017] Furthermore, an electrochromic material is provided in the black structural layer, and the electrochromic material is selected from any one of an organic electrochromic material, an inorganic electrochromic material or a composite electrochromic material.

[0018] Furthermore, the inorganic electrochromic material includes metal oxides, preferably tungsten trioxide and nickel oxide.

[0019] Furthermore, the organic electrochromic material is preferably any one or more of porogens, isophthalates, metal phthalocyanines, pyridine metal complexes, polyanilines, polypyrroles, and polythiophenes.

[0020] The present invention also provides an electronic paper comprising the above-mentioned electrochromic display panel.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: the electrochromic display panel and electronic paper of the present invention are provided with an electrochromic pixel array between the first substrate and the second substrate, and a black structural layer and a color structural layer are provided in the electrochromic pixel array. When the power is on, the black electrochromic layer turns black, and when the power is off, the black electrochromic layer is transparent; the color structural layer includes a plurality of red, green, and blue filters arranged horizontally, and the electrochromic display panel displays various colors except black through the color structural layer. Therefore, the electrochromic display panel can display both black and other colors, and its display colors are rich, and its structure is simple and easy to prepare. The electrochromic display panel and electronic paper are provided with micro-nano structures on the first electrode and / or the second electrode in the electrochromic pixel array, which can increase its contact area, make it have better electrochemical properties, and make the distribution of the electric field between the two electrodes more uniform, thereby enhancing its conductive effect and response speed, and the structure is simple and easy to prepare.

[0022] The electrochromic display panel and electronic paper fix the electrochromic pixel array on the white reflective layer by bonding, eliminating the packaging step of the liquid electrochromic material and avoiding the collapse of the electrode above the gap due to pressure difference and the easy leakage, thereby saving production costs and improving product quality.

[0023] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of the electrochromic display panel shown in the present invention;

[0025] Figure 2a and Figure 2b Schematic diagrams of two structures of the electrochromic display panel shown in the present invention;

[0026] Figure 3 and Figure 4 Schematic diagram of the structure of the micro-nano structure in the electrochromic display panel shown in the present invention;

[0027] Figure 5 and Figure 6 Schematic diagrams of two other structures of the electrochromic display panel shown in the present invention;

[0028] Figure 7 Schematic diagram of the structure of the electrochromic display panel shown in the first embodiment of the present invention;

[0029] Figure 8 FIG. 1 is a structural diagram of an electrochromic display panel shown in the second embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] It should be noted that the terms “upper”, “lower”, “left”, “right”, “inner” and “outer” in the present invention are only used to illustrate the present invention with reference to the drawings and are not intended to be limiting.

[0032] See Figure 1 and Figure 2a In the vertical direction 10, the electrochromic display panel shown in the present invention includes, from bottom to top, a first substrate 1, an electrochromic pixel array 3, and a second substrate 4, which are arranged in sequence. The electrochromic pixel array 3 includes a plurality of independently controlled electrochromic units 30 arranged in an array. The electrochromic units 30 include a black structural layer 31 and a color structural layer 32. The black structural layer 31 includes, in the vertical direction 10, a first electrode 311, a black electrochromic pixel layer 312, and a second electrode 313, which are arranged in sequence on the color structural layer 32. When power is applied, the black structural layer 31 turns black; when power is removed, the black structural layer 31 becomes transparent. The color structural layer 32 is disposed between the first substrate 1 and the first electrode 311. To present a color image, the color structural layer 32 includes a plurality of color filters 321, including a plurality of red, green, and blue filters arranged horizontally. The electrochromic display panel can display various colors besides black through the color structural layer 32.

[0033] Please combine Figure 2bThe color structure layer 32 can also be disposed between the black electrochromic pixel layer 312 and the second electrode 313. In the vertical direction 10, the electrochromic display panel shown in the present invention includes, from bottom to top, a first substrate 1, an electrochromic pixel array 3, and a second substrate 4, which are sequentially disposed. The electrochromic pixel array 3 includes a plurality of independently controlled electrochromic units 30 arranged in an array. The electrochromic unit 30 includes a black structure layer 31 and a color structure layer 32. The black structure layer 31 includes, in the vertical direction 10, a first electrode 311, a black electrochromic pixel layer 312, and a second electrode 313, which are sequentially disposed on the first substrate 1. When power is on, the black structure layer 31 turns black, and when power is off, the black structure layer 31 is transparent. The color structure layer 32 is arranged between the second electrode 313 and the second substrate 3. In order to present a color image, the color structure layer 32 includes a plurality of color filters 321, including several red, green, and blue filters arranged horizontally. The electrochromic display panel can display various colors except black through the color structure layer 32.

[0034] The black structure layer 31 can not only realize pure black display, but also realize grayscale display.

[0035] The black structure layer 31 is also provided with a solid ion storage layer 314 and a conductive layer 315 . The ion storage layer 315 is provided on the first electrode 311 , the conductive layer 315 is provided on the ion storage layer 314 , and the black electrochromic pixel layer 312 is provided on the conductive layer 315 .

[0036] In the present invention, the color of the color filter 321 is selected from red, green and blue, and the colors of the color filters 321 in any two adjacent pixel units are different. It should be noted that the color structure layer 32 can be arranged on the black electrochromic pixel layer 312 and the conductive layer 315, or, between the black electrochromic pixel layer 312 and the second electrode 313. And the color filter 321 in each pixel unit needs to be arranged in a one-to-one correspondence with the black electrochromic pixel layer 312 of each pixel unit. In order to avoid crosstalk between the colors of each pixel unit when the electrochromic display panel of the present invention performs color display, a pixel barrier wall (not shown) is also provided between the first substrate 1 and the second substrate 4 to divide the pixel units.

[0037] Please combine Figure 3The first electrode 311 has a first opposing surface 3111 that opposes the second electrode 313. The second electrode 313 has a second opposing surface 3131 that opposes the first electrode 311. Several micro-nanostructures 5 are provided on the first opposing surface 3111 and / or the second opposing surface 3131. The micro-nanostructures 5 provided on the second opposing surface 3131 are used as an example for illustration and are not intended to be a preferred or limiting structure. Furthermore, the micro-nanostructures 5 can be formed using methods such as photolithography, laser etching, and nanoimprinting. Conventional first and second electrodes 311 and 313 are generally rectangular or circular in shape. This description assumes that the first and second electrodes 311 and 313 are rectangular in shape. Considering technical difficulty and cost, the micro-nanostructures 5 are preferably concave-convex groove structures. The concave-convex groove structures 5 can be distributed periodically or aperiodically on the second electrode 313. Furthermore, the grooves of the concave-convex groove structures 5 can have the same or different widths and the same or different depths. The grooves can be rectangular, trapezoidal, or arcuate.

[0038] When the concave-convex groove structure 5 is periodically distributed on the second opposite surface 3131 of the second electrode 313, the electric field between the first electrode 311 and the second electrode 313 is uniformly distributed. Alternatively, please combine Figure 4 Because the electric field at the edge of the second electrode 313 is more likely to be unevenly distributed, the concave-convex groove structure 5 is non-periodically distributed on the second opposing surface 3131 of the second electrode 313, and the concave-convex groove structure 5 is more densely distributed near the edge of the second electrode 313 than near the center of the second electrode 313. Of course, the concave-convex groove structure 5 can also be provided solely on the first electrode 311, the third electrode 321, or the fourth electrode 323, or on any two or more electrodes between the first electrode 311, the second electrode 313, the third electrode 321, and the fourth electrode 323. The first electrode 311, the second electrode 313, the third electrode 321, and the fourth electrode 323 can also be circular structures, and their arrangement is the same as the above case, which will not be explained here.

[0039] Please combine Figure 5 In the present invention, a white reflective layer 2 can be provided to enhance the color rendering effect. The white reflective layer 2 is formed of a polymer resin and white particles. The polymer resin can be selected from any one of phenolic resin, epoxy resin, polyamide resin, polyurethane resin or acrylic resin, and the white particles can 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. When the white reflective layer 2 is not sticky, an adhesive layer 21 can be provided between the white reflective layer 2 and the electrochromic pixel array 3. Figure 6As shown, the electrochromic pixel array 3 is adhered to the white reflective layer 2, wherein the thickness of the white reflective layer 2 is preferably 1-40 μm, and the thickness of the adhesive layer 21 is preferably 1-40 μm. When the white reflective layer 2 is adhesive, that is, a viscous polymer resin is selected, the electrochromic pixel array 3 can be directly adhered to the white reflective layer 2, wherein the thickness of the white reflective layer 2 is preferably 10-70 μm. This arrangement eliminates the need for encapsulating the liquid electrochromic material and avoids the collapse of the electrodes above the gap due to pressure differentials, which can easily lead to leakage. This ensures the stability and flatness of the electrochromic display panel with this structure and also avoids or reduces the occurrence of Newton rings and other phenomena that are detrimental to the display effect.

[0040] The black electrochromic black sub-pixel layer 312 of the present invention is provided with an electrochromic material, which is selected from any one of an organic electrochromic material, an inorganic electrochromic material or a composite electrochromic material, wherein the inorganic electrochromic material includes a metal oxide, preferably tungsten trioxide or nickel oxide; the organic electrochromic material is preferably any one or more of violaceous, isophthalic acid esters, metal phthalocyanines, pyridine metal complexes, polyanilines, polypyrroles, and polythiophenes, which can be prepared by sputtering, chemical vapor deposition, sol-gel or evaporation, or can be prepared by drying and solidifying 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 a conductive polymer. The first substrate 1 and the second substrate 4 can be transparent inorganic substrates such as quartz or glass, transparent plastic, or other commonly used transparent materials.

[0041] The present invention will be further described in detail below with reference to specific embodiments.

[0042] Example 1

[0043] See Figure 7The electrochromic display panel shown in this embodiment includes, from bottom to top, 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. The electrochromic pixel array 1-3 includes a plurality of independently controlled electrochromic units arranged in an array. The electrochromic units include a black structure layer 1-31 and a color structure layer 1-32. The black structure layer 1-31 includes, from bottom to top, 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. The first transparent electrode 1-31 is disposed on the color structure layer 1-32. The black electrochromic pixel layer 1-314 contains a plurality of electrochromic black sub-pixel units. When power is applied, the black electrochromic layer 1-314 turns black. When power is removed, the black electrochromic layer 1-34 becomes transparent. The color structure layer 1-32 is adhered to the white reflective layer 1-2 through the adhesive layer 1-21, and includes a plurality of RGB color filters 1-321 arranged horizontally. The RGB color filter 1-321 of each unit is arranged in a one-to-one correspondence with the black electrochromic pixel layer 1-314 of each unit, so that the electrochromic display panel of this embodiment can achieve color display.

[0044] In this embodiment, the first transparent electrode 1-21 has a first opposing surface 1-211 that opposes the second transparent electrode 1-25, and the second transparent electrode 1-25 has a second opposing surface 1-251 that opposes the first transparent electrode 1-21. To achieve a more uniform electric field distribution between the first transparent electrode 1-21 and the second transparent electrode 1-25, this embodiment provides a plurality of concave-convex groove structures 1-4 on the first opposing surface 1-211 and the second opposing surface 1-251. These concave-convex groove structures 1-4 are more closely distributed near the edges of the transparent electrodes. This arrangement avoids electric field boundary effects and achieves a more uniform electric field distribution. Furthermore, the grooves of the concave-convex groove structures 1-4 have the same width and depth; the grooves are rectangular in shape. In this embodiment, the first transparent electrode 1-21 and the second transparent electrode 1-25 are both rectangular structures. However, in other embodiments, circular structures are also possible. The concave-convex groove structure 1-4 of this embodiment is arranged on the first transparent electrode 1-21 and the second transparent electrode 1-25. Of course, in other embodiments, the concave-convex groove structure 1-4 can also be arranged separately on the first transparent electrode 1-21 or the second transparent electrode 1-25.

[0045] In this embodiment, both the black structural layer 1-31 and the color structural layer 1-32 are solid-state structures. The white reflective layer 1-2 is composed of a phenolic resin and dispersed titanium oxide and is applied to the first substrate 1-1 via spin coating. Furthermore, the thickness of the white reflective layer 1-2 is 20 μm, and the thickness of the adhesive layer 1-21 is 15 μm. Compared to using the adhesive white reflective layer 1-2 to adhere the first transparent electrode 1-131 or directly applying the first transparent electrode 1-311 to the white reflective layer 1-2, the adhesive layer 1-21 provides a better adhesion effect, allowing the electrochromic pixel array 1-3 to be more stably fixed to the white reflective layer 1-2.

[0046] Example 2

[0047] See Figure 8 The electrochromic display panel shown in this embodiment includes, arranged in order from bottom to top, 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. The electrochromic pixel array 2-3 includes a plurality of independently controlled electrochromic units arranged in an array. The electrochromic units include a black structural layer 2-31 and a color structural layer 2-32. The black structural layer 2-31 includes, arranged in order from bottom to top, 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. The first transparent electrode 2-31 is adhered to the white reflective layer 2-2 via an adhesive layer 2-21. The black electrochromic pixel layer 2-314 contains a plurality of electrochromic black sub-pixel units. When powered, the black electrochromic layer 2-314 turns black, and when powered off, the black electrochromic layer 2-34 becomes transparent. A color structure layer 2-32 is disposed between the second electrode 2-315 and the second substrate 2-4. It includes a plurality of horizontally arranged RGB color filters 2-321. Each RGB color filter 2-321 is spaced apart and corresponds to each black electrochromic pixel layer 2-314 in each unit, enabling the electrochromic display panel of this embodiment to achieve color display.

[0048] In this embodiment, the first transparent electrode 2-21 has a first opposing surface 2-211 that opposes the second transparent electrode 2-25, and the second transparent electrode 2-25 has a second opposing surface 2-251 that opposes the first transparent electrode 2-21. To achieve a more uniform electric field distribution between the first transparent electrode 2-21 and the second transparent electrode 2-25, this embodiment provides a plurality of periodically distributed concave-convex groove structures 2-4 on the first opposing surface 2-211 and the second opposing surface 2-251. The concave-convex groove structures 2-4 are evenly distributed on the second transparent electrode 2-25. Furthermore, the grooves of the concave-convex groove structures 2-4 have the same width and depth; the grooves are rectangular in shape. In this embodiment, the first transparent electrode 2-311 and the second transparent electrode 2-315 are both rectangular structures. However, in other embodiments, circular structures may also be used. The concave-convex groove structure 2-5 of this embodiment is arranged on the first transparent electrode 2-311 and the second transparent electrode 2-315. Of course, in other embodiments, the concave-convex groove structure 2-5 can also be arranged separately on the first transparent electrode 2-311 or the second transparent electrode 2-315.

[0049] In this embodiment, both the black structure layer 2-31 and the color structure layer 2-32 are solid-state structures. The white reflective layer 2-2 is composed of a phenolic resin and dispersed titanium oxide and is applied to the first substrate 2-1 by spin coating. Furthermore, the thickness of the white reflective layer 2-2 is 18 μm, and the thickness of the adhesive layer 2-21 is 17 μm.

[0050] Example 3

[0051] The structure of the electrochromic display panel of this embodiment is essentially the same as that of the first embodiment. The difference is that this embodiment does not include an adhesive layer. Instead, an adhesive white reflective layer is used to adhere the electrochromic pixel array, resulting in a simpler structure and easier fabrication. In this embodiment, the thickness of the white reflective layer is 45 μm.

[0052] In summary: The electrochromic display panel and electronic paper of the present invention are provided with an electrochromic pixel array between the first substrate and the second substrate, and a black structural layer and a color structural layer are provided in the electrochromic pixel array. When the power is on, the black electrochromic layer turns black, and when the power is off, the black electrochromic layer is transparent; the color structural layer includes a number of red, green, and blue filters arranged horizontally, and the electrochromic display panel displays various colors except black through the color structural layer. Therefore, the electrochromic display panel can display both black and other colors, and its display colors are rich, and its structure is simple and easy to prepare. The electrochromic display panel and electronic paper are provided with a micro-nano structure on the first electrode and / or the second electrode in the electrochromic pixel array, which can increase its contact area, make it have better electrochemical properties, and make the distribution of the electric field between the two electrodes more uniform, thereby enhancing its conductive effect and response speed, and the structure is simple and easy to prepare. In addition, the electrochromic display panel and electronic paper fix the electrochromic pixel array on the white reflective layer by bonding, eliminating the packaging step of the liquid electrochromic material and avoiding the collapse of the electrode located above the gap due to pressure difference and the easy leakage, thereby saving production costs and improving product quality.

[0053] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An electrochromic display panel, characterized in that: The invention comprises a first substrate, an electrochromic pixel array, and a second substrate arranged in sequence, wherein the electrochromic pixel array comprises a plurality of electrochromic units arranged in an array and independently controlled, wherein the electrochromic units comprise a black structural layer and a color structural layer, wherein the black structural layer comprises a first electrode, a black electrochromic pixel layer, and a second electrode arranged in sequence, wherein the color structural layer comprises a plurality of red, green, and blue filters arranged horizontally, and wherein the color structural layer is arranged on one side of the black structural layer; wherein the first electrode has a first opposing surface opposite to the second electrode, and the second electrode has a second opposing surface opposite to the first electrode, and wherein a plurality of micro-nano structures are provided on the first opposing surface and / or the second opposing surface; The black structure layer further includes an ion storage layer and a conductive layer stacked in sequence and arranged between the first electrode and the electrochromic layer; The micro-nano structure is a concave-convex groove structure; The distribution density of the concave-convex groove structure is configured to increase from the center toward the edge of the second electrode.

2. The electrochromic display panel according to claim 1, wherein: The groove widths of the concave-convex groove structure are the same or different; the groove depths are the same or different; and the groove shape is rectangular, trapezoidal, or arc-shaped.

3. The electrochromic display panel according to claim 1, wherein: The micro-nano structures are distributed periodically or non-periodically.

4. The electrochromic display panel according to claim 1, wherein: The electrochromic display panel further includes a white reflective layer, which is disposed between the first substrate and the electrochromic pixel array.

5. The electrochromic display panel according to claim 4, wherein: The electrochromic display panel further includes an adhesive layer, which is disposed between the white reflective layer and the electrochromic pixel array. The electrochromic pixel array adheres to the white reflective layer via the adhesive layer.

6. The electrochromic display panel according to claim 4, wherein: The white reflective layer is formed of a viscous polymer resin and white particles, and the electrochromic pixel array is adhered to the white reflective layer.

7. The electrochromic display panel according to claim 6, wherein: The conductive layer and the ion storage layer are solid 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 structural layer, and the electrochromic material is selected from any one of an organic electrochromic material, an inorganic electrochromic material or a composite electrochromic material.

10. The electrochromic display panel according to claim 9, wherein: The inorganic electrochromic material includes a metal oxide, and the metal oxide is tungsten trioxide or nickel oxide.

11. The electrochromic display panel according to claim 9, wherein: The organic electrochromic material is any one or more of porogens, isophthalates, metal phthalocyanines, pyridine metal complexes, polyanilines, polypyrroles, and polythiophenes.

12. An electronic paper, characterized in that: The invention comprises the electrochromic display panel according to any one of claims 1 to 11.

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