Reflective display device and method of manufacturing the same

Abstract

The embodiment of the present application provides a reflective display device and a manufacturing method thereof. The reflective display device provided by the embodiment of the present application is characterized in that: a first cholesteric liquid crystal material is arranged in a first accommodating groove, and a second cholesteric liquid crystal material is arranged in a second accommodating groove; the first cholesteric liquid crystal material in the first accommodating groove can reflect light of two wavelengths under different voltage conditions; the second cholesteric liquid crystal material in the second accommodating groove can reflect light of two wavelengths under different voltage conditions; that is, four different color sub-pixels can be formed by using two first accommodating grooves and two second accommodating grooves; the four different color sub-pixels can constitute a pixel; therefore, each pixel of the reflective display device can be modulated by using light of the four colors to form more colors; and the reflective display device provided by the embodiment of the present application can display a picture with rich colors, thereby improving the display effect of the reflective display device.

Description

Technical Field

[0001] This application relates to the field of displays, and in particular to a reflective display device and a method for manufacturing the same. Background Technology

[0002] Currently, based on the type of light source (backlight or ambient light) used, display devices can be classified into three types: transmissive, reflective, and semi-transmissive / semi-reflective. Reflective display devices achieve their display by reflecting ambient light incident on them. Because reflective display devices do not require an additional backlight module, they have received widespread attention. However, current reflective display devices are typically monochrome, meaning they can only display a single color and cannot display images with rich colors. This results in poor display quality and limited application range. Summary of the Invention

[0003] This application provides a reflective display device and its manufacturing method. The reflective display device can display images with rich colors, thereby improving the display effect of the reflective display device and expanding its application range.

[0004] In a first aspect, embodiments of this application provide a reflective display device, comprising:

[0005] A first substrate includes a first substrate and a plurality of pixel electrodes and a grid-like barrier disposed on one side of the first substrate. The grid-like barrier and the first substrate together enclose a plurality of first receiving grooves and a plurality of second receiving grooves. The bottom of each first receiving groove and the bottom of each second receiving groove are provided with the pixel electrodes. A first cholesteric liquid crystal material is disposed in the first receiving groove, and a second cholesteric liquid crystal material is disposed in the second receiving groove. The first cholesteric liquid crystal material can reflect light with wavelength λ1 under the action of a first voltage and can reflect light with wavelength λ2 under the action of a second voltage. The second cholesteric liquid crystal material can reflect light with wavelength λ3 under the action of a third voltage and can reflect light with wavelength λ4 under the action of a fourth voltage.

[0006] The second substrate is stacked on top of the first substrate. The second substrate includes a second substrate and a common electrode disposed on one side of the second substrate. The common electrode is disposed on the side of the mesh-like barrier away from the first substrate.

[0007] In some embodiments, both the first cholesteric liquid crystal material and the second cholesteric liquid crystal material include nematic liquid crystal and a dimorphic compound, wherein the dimorphic compound in the first cholesteric liquid crystal material is different from the dimorphic compound in the second cholesteric liquid crystal material.

[0008] In some embodiments, λ1 = 2n1P1sinφ, where n1 is the refractive index of the first cholesteric liquid crystal material, P1 is the pitch of the first cholesteric liquid crystal material under the first voltage, and φ is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material.

[0009] λ2 = 2n2P2sinφ, where n2 is the refractive index of the first cholesteric liquid crystal material, P2 is the pitch of the first cholesteric liquid crystal material under the second voltage, and φ is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material.

[0010] λ3 = 2n3P3sinφ, where n3 is the refractive index of the second cholesteric liquid crystal material, P3 is the pitch of the second cholesteric liquid crystal material under the third voltage, and φ is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material.

[0011] λ4 = 4n4P4sinφ, where n4 is the refractive index of the second cholesteric liquid crystal material, P4 is the pitch of the second cholesteric liquid crystal material under the fourth voltage, and φ is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material.

[0012] In some embodiments, a plurality of first receiving slots and a plurality of second receiving slots are arranged in rows in a first direction and in columns in a second direction, wherein the first direction and the second direction are perpendicular to each other;

[0013] In the first direction, a plurality of first receiving slots and a plurality of second receiving slots are arranged in a manner in which the first receiving slots and the second receiving slots are alternately arranged. At the same time, in the second direction, a plurality of first receiving slots and a plurality of second receiving slots are arranged in a manner in which the first receiving slots and the second receiving slots are alternately arranged.

[0014] In some embodiments, the material of the mesh-like barrier is a photoresist material, and the height of the mesh-like barrier is 2μm to 6μm.

[0015] Secondly, embodiments of this application provide a method for manufacturing a reflective display device, including:

[0016] A first substrate is provided, the first substrate including a first substrate and a plurality of pixel electrodes and a grid-like barrier disposed on one side of the first substrate. The grid-like barrier and the first substrate together enclose a plurality of first receiving grooves and a plurality of second receiving grooves. The bottom of each first receiving groove and the bottom of each second receiving groove are provided with the pixel electrodes. A first cholesteric liquid crystal material is disposed in the first receiving groove, and a second cholesteric liquid crystal material is disposed in the second receiving groove. The first cholesteric liquid crystal material can reflect light with wavelength λ1 under the action of a first voltage and can reflect light with wavelength λ2 under the action of a second voltage. The second cholesteric liquid crystal material can reflect light with wavelength λ3 under the action of a third voltage and can reflect light with wavelength λ4 under the action of a fourth voltage.

[0017] A second substrate is provided, the second substrate including a second substrate and a common electrode disposed on one side of the second substrate; the second substrate and the first substrate are stacked together, such that the common electrode is disposed on the side of the grid-like barrier away from the first substrate, to obtain a reflective display device.

[0018] In some embodiments, providing the first substrate includes:

[0019] A first substrate is provided, and a plurality of pixel electrodes are disposed on one side of the first substrate;

[0020] A grid-like barrier is provided on one side of the first substrate where a plurality of pixel electrodes are disposed;

[0021] A first cholesteric liquid crystal material is disposed in the first accommodating groove, and a second cholesteric liquid crystal material is disposed in the second accommodating groove.

[0022] In some embodiments, the mesh-like barrier is made of photoresist; the mesh-like barrier is formed on one side of the first substrate where a plurality of pixel electrodes are disposed by means of coating photoresist, exposure, and development.

[0023] In some embodiments, an inkjet printing method is used to deposit a first cholesteric liquid crystal material in the first accommodating groove and a second cholesteric liquid crystal material in the second accommodating groove.

[0024] In some embodiments, both the first cholesteric liquid crystal material and the second cholesteric liquid crystal material include nematic liquid crystal and a dimorphic compound, wherein the dimorphic compound in the first cholesteric liquid crystal material is different from the dimorphic compound in the second cholesteric liquid crystal material.

[0025] The reflective display device provided in this application embodiment uses a first cholesteric liquid crystal material disposed in a first accommodating groove and a second cholesteric liquid crystal material disposed in a second accommodating groove. The first cholesteric liquid crystal material in the first accommodating groove can reflect two wavelengths of light under different voltage conditions, and the second cholesteric liquid crystal material in the second accommodating groove can reflect two wavelengths of light under different voltage conditions. That is to say, four sub-pixels of different colors can be formed by using two first accommodating grooves and two second accommodating grooves. These four sub-pixels of different colors can constitute a pixel. Therefore, each pixel of the reflective display device can be modulated using these four colors of light to form more colors, thereby enabling the reflective display device of this application embodiment to display a richly colored picture, thereby improving the display effect of the reflective display device. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0027] Figure 1 This is a schematic diagram of the structure of the reflective display device provided in the embodiments of this application.

[0028] Figure 2 This is a top view of the first substrate provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram showing the state of the first cholesteric liquid crystal material provided in the embodiments of this application under the action of a first voltage.

[0030] Figure 4 A flowchart illustrating a method for manufacturing a reflective display device provided in an embodiment of this application.

[0031] Figure 5 This is a schematic diagram showing the arrangement of multiple pixel electrodes on one side of a first substrate, as provided in an embodiment of this application.

[0032] Figure 6 This is a schematic diagram showing a grid-like barrier wall on one side of a first substrate with multiple pixel electrodes, as provided in an embodiment of this application.

[0033] Figure 7 This is a schematic diagram showing the arrangement of a first cholesteric liquid crystal material in a first accommodating groove and a second cholesteric liquid crystal material in a second accommodating groove, as provided in an embodiment of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0035] Please see Figure 1 and Figure 2 This application provides a reflective display device 100, which includes a first substrate 10 and a second substrate 20 stacked together.

[0036] Please combine Figure 1 The first substrate 10 includes a first substrate 11, a plurality of pixel electrodes 14 and a grid-like barrier 12 disposed on one side of the first substrate 11. The grid-like barrier 12 and the first substrate 11 together enclose a plurality of first receiving grooves 121 and a plurality of second receiving grooves 122. Each first receiving groove 121 and each second receiving groove 122 has a pixel electrode 14 disposed at the bottom of the groove. A first cholesteric liquid crystal material 131 is disposed in the first receiving groove 121, and a second cholesteric liquid crystal material 132 is disposed in the second receiving groove 122. The first cholesteric liquid crystal material 131 can reflect light with wavelength λ1 under a first voltage and can reflect light with wavelength λ2 under a second voltage. The second cholesteric liquid crystal material 132 can reflect light with wavelength λ3 under a third voltage and can reflect light with wavelength λ4 under a fourth voltage.

[0037] Please combine Figure 1 The second substrate 20 includes a second substrate 21 and a common electrode 22 disposed on one side of the second substrate 21. The common electrode 22 is disposed on the side of the mesh-like barrier 12 away from the first substrate 11.

[0038] It is understandable that cholesteric liquid crystal materials are flat and arranged in layers, with molecules within each layer parallel to each other and their long axes parallel to the layer plane. The direction of the long axes of molecules varies slightly in different layers, and they are arranged in a helical structure along the normal direction of the layer. The pitch of the cholesteric liquid crystal material is about 300 nm, which is on the same order of magnitude as the wavelength of visible light. This pitch will change with different external temperature and electric field conditions. Therefore, the external light can be modulated by adjusting the pitch. When the pitch of the cholesteric liquid crystal material is consistent with the wavelength of light, it will selectively reflect light of that wavelength.

[0039] It is understood that the magnitudes of the first voltage, second voltage, third voltage, and fourth voltage are different, and the magnitudes of λ1, λ2, λ3, and λ4 are different. That is to say, the first cholesteric liquid crystal material 131 in the first accommodating groove 121 can reflect two wavelengths (i.e., two colors) of light under different voltage conditions, and the second cholesteric liquid crystal material 132 in the second accommodating groove 122 can reflect two wavelengths (i.e., two colors) of light under different voltage conditions. It is understood that each first accommodating groove 121 or each second accommodating groove 122 can be equivalent to a sub-pixel. Thus, four sub-pixels of different colors can be formed by using two first accommodating grooves 121 and two second accommodating grooves 122. These four sub-pixels of different colors can constitute a pixel 30. Thus, each pixel 30 can be modulated with four colors of light to form more colors, which can enable the reflective display device 100 provided in this application embodiment to display a rich color picture, thereby improving the display effect of the reflective display device 100.

[0040] Please see Figure 2 Multiple first receiving slots 121 and multiple second receiving slots 122 can be arranged in rows along a first direction X and in columns along a second direction Y, with the first direction X and the second direction Y being perpendicular to each other; and, in the first direction X, multiple first receiving slots 121 and multiple second receiving slots 122 can be arranged in an alternating manner between the first receiving slots 121 and the second receiving slots 122, and in the second direction Y, multiple first receiving slots 121 and multiple second receiving slots 122 can be arranged in an alternating manner between the first receiving slots 121 and the second receiving slots 122.

[0041] It is understood that the four accommodating slots arranged in the first direction X or the second direction Y, namely the first accommodating slot 121, the second accommodating slot 122, can constitute a pixel 30. When the reflective display device 100 is working, the first cholesteric liquid crystal material 131 in the two first accommodating slots 121 in each pixel 30 reflects light of different colors under different voltages, and the second cholesteric liquid crystal material 132 in the two second accommodating slots 122 in each pixel 30 reflects light of different colors under different voltages. Thus, each pixel 30 is provided with four sub-pixels of different colors. Therefore, each pixel 30 can be modulated with four colors of light to form more colors, thereby enabling the reflective display device 100 provided in this application embodiment to display a richly colored picture.

[0042] For example, both the first cholesteric liquid crystal material 131 and the second cholesteric liquid crystal material 132 include nematic liquid crystal and dimorphic compound, and the dimorphic compound in the first cholesteric liquid crystal material 131 is different from the dimorphic compound in the second cholesteric liquid crystal material 132.

[0043] For example, both the dimesocrystalline compound in the first cholesteric liquid crystal material 131 and the dimesocrystalline compound in the second cholesteric liquid crystal material 132 include two different mesocrystalline structural units (i.e., chiral units) connected by flexible spacer groups. That is, the dimesocrystalline compound is bichiral, and under different voltage driving conditions, it can exhibit different helical arrangement effects. For example, the mesocrystalline structural units contained in the dimesocrystalline compound in the first cholesteric liquid crystal material 131 and the dimesocrystalline compound in the second cholesteric liquid crystal material 132 are different; for example, the ratio of single to double bonds in the mesocrystalline structural units is different, and the chain length of the mesocrystalline structural units is different.

[0044] Please combine Figure 3 Regarding the light rays with wavelengths λ1 and λ2 reflected by the first cholesteric liquid crystal material 131, and the light rays with wavelengths λ3 and λ4 reflected by the second cholesteric liquid crystal material 132, the formulas for calculating wavelengths λ1, λ2, λ3, and λ4 are as follows:

[0045] λ1 = 2n1P1sinφ1, where n1 is the refractive index of the first cholesteric liquid crystal material 131, P1 is the pitch of the first cholesteric liquid crystal material 131 under the first voltage, and φ1 is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material 131.

[0046] λ2 = 2n1P2sinφ1, where n1 is the refractive index of the first cholesteric liquid crystal material 131, P2 is the pitch of the first cholesteric liquid crystal material 131 under the second voltage, and φ1 is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material 131.

[0047] λ3 = 2n2P3sinφ2, where n2 is the refractive index of the second cholesteric liquid crystal material 132, P3 is the pitch of the second cholesteric liquid crystal material 132 under the third voltage, and φ2 is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material 132.

[0048] λ4 = 4n2P4sinφ2, where n2 is the refractive index of the second cholesteric liquid crystal material 132, P4 is the pitch of the second cholesteric liquid crystal material 132 under the fourth voltage, and φ2 is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material 132.

[0049] As can be seen from the calculation formulas for λ1, λ2, λ3, and λ4 above, when the refractive index n1 of the first cholesteric liquid crystal material 131 is equal to the refractive index n2 of the second cholesteric liquid crystal material 132, and the incident angles φ1 and φ2 are equal, the reflection wavelengths λ1, λ2, λ3, and λ4 are also different due to the different pitches P1, P2, P3, and P4.

[0050] For example, the material of the mesh barrier 12 can be a photoresist material.

[0051] For example, the height of the grid-like retaining wall 12 is 2μm to 6μm, such as 2μm, 3μm, 4μm, 5μm, 6μm, etc.

[0052] For example, the materials of pixel electrode 14 and common electrode 22 can both be transparent conductive metal oxides, such as indium tin oxide (ITO).

[0053] For example, the first substrate 10 may also include a color filter (CF) and / or a thin-film transistor (TFT), which may be disposed between the first substrate 11 and the pixel electrode 14 and the grid-like barrier 12.

[0054] For example, the second substrate 20 may also include a color filter (CF) and / or a thin-film transistor (TFT), which may be disposed between the second substrate 21 and the common electrode 22.

[0055] For example, the pixel electrode 14 is in the form of a continuous block. The area of ​​the pixel electrode 14 in the first receiving groove 121 can be equal to the area of ​​the bottom of the first receiving groove 121, and the area of ​​the pixel electrode 14 in the second receiving groove 122 can be equal to the area of ​​the bottom of the second receiving groove 122. For example, the area of ​​the bottom of the first receiving groove 121 is equal to the area of ​​the bottom of the second receiving groove 122. In this case, the areas of the plurality of pixel electrodes 14 disposed on the first substrate 11 are equal.

[0056] For example, the multiple first receiving slots 121, multiple second receiving slots 122, and multiple pixel electrodes 14 are all rectangular in shape.

[0057] For example, the reflective display device 100 can be a four-color electronic price tag, an e-book, an outdoor display screen (such as a bus stop sign), etc.

[0058] Please see Figure 4 At the same time, combined Figure 1 as well as Figures 5 to 7 This application also provides a method for manufacturing a reflective display device, comprising:

[0059] S100, please refer to Figure 7 A first substrate 10 is provided, which includes a first substrate 11, a plurality of pixel electrodes 14 and a grid-like barrier 12 disposed on one side of the first substrate 11. The grid-like barrier 12 and the first substrate 11 together enclose a plurality of first receiving grooves 121 and a plurality of second receiving grooves 122. A pixel electrode 14 is disposed at the bottom of each first receiving groove 121 and at the bottom of each second receiving groove 122. A first cholesteric liquid crystal material 131 is disposed in the first receiving groove 121, and a second cholesteric liquid crystal material 132 is disposed in the second receiving groove 122. The first cholesteric liquid crystal material 131 can reflect light with wavelength λ1 under a first voltage and can reflect light with wavelength λ2 under a second voltage. The second cholesteric liquid crystal material 132 can reflect light with wavelength λ3 under a third voltage and can reflect light with wavelength λ4 under a fourth voltage.

[0060] Please combine Figures 5 to 7 "Providing the first substrate 10" may specifically include:

[0061] Please combine Figure 5 A first substrate 11 is provided, and a plurality of pixel electrodes 14 are disposed on one side of the first substrate 11;

[0062] Please combine Figure 6 A grid-like barrier 12 is provided on one side of the first substrate 11 where a plurality of pixel electrodes 14 are provided. The grid-like barrier 12 and the first substrate 11 together enclose a plurality of first receiving grooves 121 and a plurality of second receiving grooves 122. A pixel electrode 14 is provided at the bottom of each first receiving groove 121 and at the bottom of each second receiving groove 122.

[0063] Please combine Figure 7 A first cholesteric liquid crystal material 131 is disposed in the first accommodating groove 121, and a second cholesteric liquid crystal material 132 is disposed in the second accommodating groove 122.

[0064] For example, the material of the grid-like barrier 12 can be a photoresist material; the grid-like barrier 12 can be set on one side of the first substrate 11 where multiple pixel electrodes 14 are provided by means of coating photoresist material, exposure, and development.

[0065] For example, the height of the grid-like retaining wall 12 can be 2μm to 6μm, such as 2μm, 3μm, 4μm, 5μm, 6μm, etc.

[0066] For example, an inkjet printing method can be used to deposit a first cholesteric liquid crystal material 131 in a first receiving groove 121 and a second cholesteric liquid crystal material 132 in a second receiving groove 122.

[0067] For example, both the first cholesteric liquid crystal material 131 and the second cholesteric liquid crystal material 132 include nematic liquid crystal and dimorphic compound, and the dimorphic compound in the first cholesteric liquid crystal material 131 is different from the dimorphic compound in the second cholesteric liquid crystal material 132.

[0068] For example, the material of the pixel electrode 14 can be a transparent conductive metal oxide, such as indium tin oxide (ITO).

[0069] S200, please refer to Figure 1 A second substrate 20 is provided, the second substrate 20 including a second substrate 21 and a common electrode 22 disposed on one side of the second substrate 21; the second substrate 20 and the first substrate 10 are stacked and disposed such that the common electrode 22 is disposed on the side of the grid-like barrier 12 away from the first substrate 11, thereby obtaining a reflective display device 100.

[0070] For example, the material of the common electrode 22 can be a transparent conductive metal oxide, such as indium tin oxide (ITO).

[0071] Existing reflective liquid crystal display devices are usually electrophoretic display devices (such as e-ink electronic ink screens). However, the manufacturing process of electrophoretic display devices is relatively complex and the production cost is high. In contrast, the reflective display device 100 provided in this application embodiment has a simpler manufacturing process, is more feasible for mass production, and has a lower production cost.

[0072] The reflective display device and its manufacturing method provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application, and the descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A reflective display device, characterized by include: A first substrate includes a first sub-substrate, a plurality of pixel electrodes and a grid-like barrier disposed on one side of the first substrate. The grid-like barrier and the first substrate together enclose a plurality of first receiving grooves and a plurality of second receiving grooves. The pixel electrodes are disposed at the bottom of each first receiving groove and the bottom of each second receiving groove. A first cholesteric liquid crystal material is disposed in the first receiving groove, and a second cholesteric liquid crystal material is disposed in the second receiving groove. The first cholesteric liquid crystal material can reflect light with wavelength λ1 under a first voltage and light with wavelength λ2 under a second voltage. The second cholesteric liquid crystal material can reflect light with wavelength λ3 under a third voltage and light with wavelength λ4 under a fourth voltage. The first voltage and the second voltage are different in magnitude, and the third voltage and the fourth voltage are different in magnitude. The second substrate is stacked on top of the first substrate. The second substrate includes a second substrate and a common electrode disposed on one side of the second substrate. The common electrode is disposed on the side of the mesh-like barrier away from the first substrate.

2. The reflective display device of claim 1, wherein Both the first cholesteric liquid crystal material and the second cholesteric liquid crystal material include nematic liquid crystal and dimorphic compounds. The dimorphic compounds in the first cholesteric liquid crystal material are different from those in the second cholesteric liquid crystal material.

3. The reflective display device of claim 1, wherein λ1=2n1P1sinφ, where n1 is the refractive index of the first cholesteric liquid crystal material, P1 is the pitch of the first cholesteric liquid crystal material under the first voltage, and φ is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material. λ2=2n2P2sinφ, where n2 is the refractive index of the first cholesteric liquid crystal material, P2 is the pitch of the first cholesteric liquid crystal material under the second voltage, and φ is the angle between the incident direction of the light and the plane parallel to the first cholesteric liquid crystal material. λ3 = 2n3P3sinφ, where n3 is the refractive index of the second cholesteric liquid crystal material, P3 is the pitch of the second cholesteric liquid crystal material under the third voltage, and φ is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material. λ4 = 4n4P4sinφ, where n4 is the refractive index of the second cholesteric liquid crystal material, P4 is the pitch of the second cholesteric liquid crystal material under the fourth voltage, and φ is the angle between the incident direction of the light and the plane parallel to the second cholesteric liquid crystal material.

4. The reflective display device of claim 1, wherein The plurality of first receiving slots and the plurality of second receiving slots are arranged in several rows in a first direction and in several columns in a second direction, wherein the first direction and the second direction are perpendicular to each other; In the first direction, a plurality of first receiving slots and a plurality of second receiving slots are arranged in a manner in which the first receiving slots and the second receiving slots are alternately arranged. At the same time, in the second direction, a plurality of first receiving slots and a plurality of second receiving slots are arranged in a manner in which the first receiving slots and the second receiving slots are alternately arranged.

5. The reflective display device according to any one of claims 1-4, characterized in that The mesh-like barrier is made of photoresist material, and its height is 2μm to 6μm.

6. A method for manufacturing a reflective display device, characterized by include: A first substrate is provided, the first substrate including a first substrate and a plurality of pixel electrodes and a grid-like barrier disposed on one side of the first substrate. The grid-like barrier and the first substrate together enclose a plurality of first receiving grooves and a plurality of second receiving grooves. The bottom of each first receiving groove and the bottom of each second receiving groove are provided with the pixel electrodes. A first cholesteric liquid crystal material is disposed in the first receiving groove and a second cholesteric liquid crystal material is disposed in the second receiving groove. The first cholesteric liquid crystal material can reflect light with wavelength λ1 under a first voltage and light with wavelength λ2 under a second voltage; the second cholesteric liquid crystal material can reflect light with wavelength λ3 under a third voltage and light with wavelength λ4 under a fourth voltage; wherein the first voltage and the second voltage are different in magnitude, and the third voltage and the fourth voltage are different in magnitude. A second substrate is provided, the second substrate including a second substrate and a common electrode disposed on one side of the second substrate; the second substrate and the first substrate are stacked together, such that the common electrode is disposed on the side of the grid-like barrier away from the first substrate, to obtain a reflective display device.

7. The method for manufacturing a reflective display device according to claim 6, characterized in that, The provision of the first substrate includes: A first substrate is provided, and a plurality of pixel electrodes are disposed on one side of the first substrate; A grid-like barrier is provided on one side of the first substrate where a plurality of pixel electrodes are disposed; A first cholesteric liquid crystal material is disposed in the first accommodating groove, and a second cholesteric liquid crystal material is disposed in the second accommodating groove.

8. The method of claim 7, wherein the reflective display device is a reflective liquid crystal display device. The mesh-like barrier is made of photoresist material; the mesh-like barrier is set on one side of the first substrate where multiple pixel electrodes are located by means of coating photoresist material, exposure, and development.

9. The method of claim 6, wherein the reflective display device is a reflective liquid crystal display device. A first cholesteric liquid crystal material is disposed in the first accommodating groove and a second cholesteric liquid crystal material is disposed in the second accommodating groove using an inkjet printing method.

10. A method of fabricating a reflective display device according to any one of claims 6 to 9, wherein Both the first cholesteric liquid crystal material and the second cholesteric liquid crystal material include nematic liquid crystal and dimorphic compounds. The dimorphic compounds in the first cholesteric liquid crystal material are different from those in the second cholesteric liquid crystal material.

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