Reflection type device based on polymer dispersed liquid crystal and manufacturing method thereof

Abstract

The invention provides a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof. The reflective device comprises an upper substrate, a lower substrate is arranged at the bottom of the upper substrate, liquid crystal slurry is arranged between the upper substrate and the lower substrate, the liquid crystal slurry comprises a polymerizable monomer and a dichroic dye, the upper substrate comprises a substrate, and a plurality of pixelated electrodes are arranged on the substrate. According to the device, black polymer dispersed liquid crystals (PDLC) are adopted as liquid crystal materials, the white reflectivity of the PDLC is improved, and meanwhile, a metal reflecting layer or a second reflecting layer is adopted to replace a black substrate. The white reflection of the device mainly depends on the reflection of the reflecting layer, and the reflecting layer is a metal reflecting layer or a second reflecting layer instead of the back scattering of polymer dispersed liquid crystal (PDLC), so that the ambient light can be more effectively utilized for reflecting display, and the device can obtain higher white reflectivity and higher contrast ratio.

Description

Technical Field

[0001] The present invention relates to the field of reflective display, and in particular to a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof. Background Art

[0002] At present, there are three main reflective display technologies: electrophoretic display, cholesteric liquid crystal (CLC) reflective display and PDLC reflective display. Electrophoretic display has difficulty in preparing raw materials, complex processes and slow response speed. CLC reflective display has slow progress due to the color deviation problem of CLC selective reflection under different viewing angles. PDLC reflective display is based on polymer dispersed liquid crystal (PDLC). When the PDLC film is not powered, the PDLC film will strongly scatter the incident light, and the PDLC has extremely high haze. When the PDLC film is powered, the PDLC film is switched to a transparent state with high light transmittance and low haze.

[0003] The PDLC layer of the existing reflective device is placed between the upper and lower substrates. The upper and lower substrates are attached to one side of the PDLC with patterned electrodes, and a black substrate is provided under the lower substrate. When no electric field is applied to the PDLC, the PDLC appears white as a whole due to the scattering effect of the PDLC on the ambient light. When the patterned electrodes are energized, the liquid crystal molecules of the PDLC in the energized area are oriented along the direction of the electric field. The light incident on this area passes through the PDLC layer and hits the black substrate, where it is absorbed by the black substrate, while the PDLC in the unenergized area remains in a scattered state and appears white, thereby achieving the display of black text on a white background. The white state of PDLC mainly depends on the backscattering performance of PDLC. However, due to the low backscattering level of the PDLC in the off state, the white reflectivity of PDLC is generally below 10%, which makes it difficult to meet the market demand for reflective display, greatly limiting its development as a reflective display solution. To this end, we propose a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof to solve the above problems. Summary of the invention

[0004] The present invention provides a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof, which solves the problems that the raw materials of the reflective display are difficult to prepare, the process is complicated and the response speed is slow, the cholesteric liquid crystal (CLC) reflective display has color deviation at different viewing angles, and the two reflective modes progress slowly.

[0005] Another technical problem solved by the present invention is that the white state of PDLC mainly depends on the backscattering performance of PDLC, but since the backscattering level of PDLC in the off state is very low, the white reflectivity of PDLC is generally below 10%, which is difficult to meet the market demand for reflective display, greatly limiting the development of its reflective mode.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof, comprising an upper substrate, a lower substrate is provided at the bottom of the upper substrate, a liquid crystal slurry is provided between the upper substrate and the lower substrate, the liquid crystal slurry includes a polymerizable monomer and a dichroic dye, the upper substrate includes a substrate, a plurality of pixelated electrodes are provided on the substrate, and the dichroic dye is black.

[0007] In a preferred embodiment, the dichroic dye is a positive dichroic dye, and the liquid crystal slurry includes liquid crystal and an initiator.

[0008] In a preferred solution, the lower substrate has the same structure as the upper substrate, a reflective layer substrate is provided at the bottom of the lower substrate, the reflective layer substrate includes a second substrate, and a second reflective layer is provided on the second substrate.

[0009] In a preferred solution, the second substrate has the same structure as the substrate, the substrate includes a conductive layer and thin film transistors connected to the conductive layer, and the pixelated electrodes of the upper substrate are energized with the pixelated electrodes of the lower substrate.

[0010] In a preferred solution, the lower substrate includes a flexible substrate, the flexible substrate is a PI film, a PET film, or a TAC film, and a metal reflective layer is provided on the flexible substrate.

[0011] In a preferred solution, the upper substrate has the same structure as the flexible base, a first glass substrate is disposed at the bottom of the upper substrate, the metal reflective layer serves as a common electrode of the lower substrate, and the pixelated electrode of the upper substrate is energized with the metal reflective layer.

[0012] In a preferred embodiment, the dichroic dye has a rectangular structure, a first charged terminal is provided at one end of the dichroic dye, and a second charged terminal is provided at the other end of the dichroic dye. A grid is provided between the upper substrate and the lower substrate, and the liquid crystal slurry is installed in the grid. A first electrode is provided on one side of the upper substrate, and a second electrode is provided on the other side of the upper substrate. The first electrode and the second electrode are installed on the grid.

[0013] A method for manufacturing a reflective device based on polymer dispersed liquid crystal, characterized by: S1, preparing liquid crystal slurry; S2, preparation of upper substrate and lower substrate; S3, placing liquid crystal slurry between the upper substrate and the lower substrate; S4, a polymerization process polymerizes the polymerizable monomer to form a polymer dispersed liquid crystal (PDLC); S5, preparing a reflective layer substrate; S6. Power is supplied to the upper substrate and the lower substrate.

[0014] In a preferred embodiment, in S2, a pixelated electrode is prepared on white glass; In S3, the liquid crystal slurry is placed between the upper and lower electrodes by liquid crystal drop process (ODF), vacuum infusion or capillary action, and the thickness of the liquid crystal slurry is controlled by spacer particles such as silicon balls or polystyrene; In S4, the photopolymerizable monomer is photopolymerized and the thermally polymerizable monomer is thermally polymerized to form a polymer dispersed liquid crystal (PDLC); In S5, a second reflective layer is formed on the entire surface of the white glass; The prepared polymer dispersed liquid crystal (PDLC) and the reflective layer substrate are aligned with each other through the liquid crystal drop process (ODF) to make the whole appear black; In S6, the pixelated electrodes of the upper substrate and the pixelated electrodes of the lower substrate are partially energized, and the energized parts are white patterns, while the unenergized parts remain black.

[0015] In a preferred solution, in S2, in the preparation of the upper substrate, the flexible substrate of the upper substrate is adhered to the first glass substrate, and in the preparation of the lower substrate, the flexible substrate is adhered to the second glass substrate, and a metal reflective layer is prepared on the flexible substrate on the entire surface, and the metal reflective layer is a common electrode of the lower substrate; peeling the upper substrate and the lower substrate from the glass substrate; In S3, liquid crystal slurry is placed between the upper substrate and the lower substrate by a roll-to-roll production process; In S5, the second reflective layer is used as a reflective layer substrate, and there is no need to prepare a reflective layer substrate. In S6, power is supplied to the second reflective layer and the local pixelated electrode.

[0016] The beneficial effects of the present invention are as follows: the device uses a black polymer dispersed liquid crystal (PDLC) as the liquid crystal material of the polymer dispersed liquid crystal (PDLC), improves the white reflectivity of the polymer dispersed liquid crystal (PDLC), and uses a metal reflective layer or a second reflective layer instead of a black substrate. At this time, when the PDLC layer is not energized, the dichroic dye is randomly arranged in the liquid crystal droplets, and has a strong absorption of the ambient light, so that the device appears black. When the polymer dispersed liquid crystal (PDLC) layer is energized, the dichroic dye is vertically arranged with the liquid crystal molecules, and the absorption effect of the dichroic dye is greatly weakened or even disappears. At the same time, the scattering effect of the liquid crystal slurry on the ambient light disappears, so that the ambient light can directly hit the reflective layer below the liquid crystal slurry, and after being reflected by the reflective layer, it is re-transmitted through the polymer dispersed liquid crystal (PDLC) layer to emit the device, thereby displaying a white state. Since the white reflection of the device mainly depends on the reflection of the reflective layer, the reflective layer is a metal reflective layer or a second reflective layer, rather than relying on the backscattering of the polymer dispersed liquid crystal (PDLC), compared with some other display modes, it can more effectively utilize the ambient light for reflection display, thereby improving the brightness and clarity of the white display. Therefore, the device can obtain higher white reflectivity and higher contrast.

[0017] Compared with the disadvantage of slow response speed of electrophoretic display, this form in the present device may have more advantages in response speed. When an electric field is applied to the PDLC layer to energize it, the liquid crystal molecules and dichroic dyes can quickly align vertically, thereby quickly achieving a transition from black state to white state. This fast response capability makes it perform better in application scenarios where dynamic content is displayed or the display state needs to be switched quickly, and has great promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments; Figure 1 It is a schematic diagram of the power-on structure of the upper substrate, the lower substrate and the reflective layer substrate of the present invention; Figure 2 The present invention Figure 1 A schematic diagram of the structure of the middle and upper substrate; Figure 3 The present invention Figure 1 Schematic diagram of the local structure; Figure 4 is a schematic diagram of a reflective layer substrate of the present invention; Figure 5 The present invention Figure 1 There is no schematic diagram of the power supply structure; Figure 6 This is a schematic diagram of the metal reflective layer of the lower substrate of the present invention being used as a reflective layer and being powered; Figure 7 The present invention Figure 6Schematic diagram of the local structure; Figure 8 The present invention Figure 6 Schematic diagram of the middle and lower substrates; Fig. 9 It is Benfa Figure 6 There is no schematic diagram of the powered structure; Fig.10 It is a schematic diagram of the upper substrate, the lower substrate and the dichroic dye in the reflective layer of the present invention being rectangular; Fig.11 It is a schematic diagram of the dichroic dye in the upper substrate, the lower substrate and the reflective layer of the present invention being electrified in a rectangular shape; Fig.12 The present invention Fig.11 A is an enlarged schematic diagram; Fig.13 It is a schematic diagram of the metal reflective layer of the substrate in the present invention as a reflective layer in which the dichroic dye is rectangular; In the figure: upper substrate 1; substrate 101; pixelated electrode 102; first glass substrate 103; lower substrate 2; flexible substrate 201; metal reflective layer 202; second glass substrate 203; reflective layer substrate 3; second substrate 301; second reflective layer 302; dichroic dye 4; first charged terminal 401; second charged terminal 402; liquid crystal slurry 5; polymerizable monomer 501; first electrode 6; second electrode 7. DETAILED DESCRIPTION

[0019] Embodiment 1: like Figure 1-13 In the present invention, a reflective device based on polymer dispersed liquid crystal and a manufacturing method thereof include an upper substrate 1, a lower substrate 2 is provided at the bottom of the upper substrate 1, a liquid crystal slurry 5 is provided between the upper substrate 1 and the lower substrate 2, the liquid crystal slurry 5 includes a polymerizable monomer 501 and a dichroic dye 4, and the upper substrate 1 includes a substrate 101, and a plurality of pixelated electrodes 102 are provided on the substrate 101. According to the structure, the dichroic dye 4 is a spherical or rectangular structure.

[0020] The device uses a black polymer dispersed liquid crystal PDLC as the liquid crystal material of the polymer dispersed liquid crystal PDLC, improves the white reflectivity of the polymer dispersed liquid crystal PDLC, and uses a metal reflective layer 202 or a second reflective layer 302 instead of a black substrate. At this time, when the PDLC layer is not powered on, the dichroic dye is randomly arranged in the liquid crystal droplets, and has a strong absorption of ambient light, so that the device appears black. When the polymer dispersed liquid crystal PDLC layer is powered on, the dichroic dye is vertically arranged with the liquid crystal molecules, and the absorption effect of the dichroic dye is greatly weakened or even disappears. At the same time, the scattering effect of the liquid crystal slurry 5 on the ambient light disappears, so that the ambient light can directly hit the reflective layer below the liquid crystal slurry 5, and after being reflected by the reflective layer, it is re-transmitted through the polymer dispersed liquid crystal PDLC layer to emit the device, thereby displaying a white state. Since the white reflection of the device mainly depends on the reflection of the reflective layer, the reflective layer is a metal reflective layer 202 or a second reflective layer 302, rather than relying on the backscattering of the polymer dispersed liquid crystal (PDLC), compared with some other display modes, it can more effectively utilize ambient light for reflection display, thereby improving the brightness and clarity of the white display. Therefore, the device can obtain higher white reflectivity and higher contrast.

[0021] At the same time, compared with the two displays of electrophoretic display and cholesteric liquid crystal (CLC) reflection, the process of using black dichroic dye liquid crystal as PDLC liquid crystal material in this device is simpler. The power-on control of the PDLC layer to achieve the change of display state does not require multiple tedious preparation processes like some complex processes, thereby reducing possible problems in the process and improving production efficiency. Unlike the color shift problem of cholesteric liquid crystal (CLC) reflection display at different viewing angles, this method of using black dichroic dye liquid crystal as PDLC liquid crystal material may not be affected by changes in viewing angle, or the degree of color shift is small. This means that when viewing the display device from different angles, a relatively stable color display can be maintained, which improves the stability and reliability of the display quality.

[0022] Compared with the disadvantage of slow response speed of electrophoretic display, this form in the present device may have an advantage in response speed. When an electric field is applied to the PDLC layer to energize it, the liquid crystal molecules and dichroic dyes can quickly align vertically, thereby quickly achieving a transition from black state to white state. This fast response capability makes it perform better in application scenarios that display dynamic content or require fast switching of display states, and can display information more timely.

[0023] In a preferred embodiment, the dichroic dye 4 is a positive dichroic dye, and the liquid crystal slurry 5 includes a liquid crystal and an initiator. According to this structure, the dichroic dye used in the dichroic dye 4 is a positive dichroic dye, and when the arrangement direction of the dye molecules is inconsistent with the direction of the light, it has a strong absorption effect on the light; when the arrangement direction of the dye molecules is consistent with the direction of the light, its absorption effect on the light will be greatly weakened or even disappear, so that the ambient light can directly hit the reflective layer below the liquid crystal slurry 5.

[0024] In the preferred solution, the lower substrate 2 has the same structure as the upper substrate 1, and a reflective layer substrate 3 is provided at the bottom of the lower substrate 2, and the reflective layer substrate 3 includes a second substrate 301, and a second reflective layer 302 is provided on the second substrate 301. With this structure, the lower substrate 2 has the same structure as the upper substrate 1, which greatly saves the time for making the lower substrate 2 and the upper substrate 1, avoids complex processes, and thus avoids multiple tedious preparation processes, thereby reducing possible problems in the process links and improving production efficiency. The reflective layer substrate 3 material includes but is not limited to silver and aluminum.

[0025] In a preferred embodiment, the second substrate 301 has the same structure as the substrate 101, the substrate 101 includes a conductive layer and a thin film transistor connected to the conductive layer, and the pixelated electrode 102 of the upper substrate 1 is energized with the pixelated electrode of the lower substrate 2. With this structure, the pixelated electrode 102 of the upper substrate 1 is energized with the pixelated electrode of the lower substrate 2, so that the pixelated electrodes of the two substrates form an upper and lower pole. The liquid crystal in the liquid crystal droplet between the upper and lower electrodes is oriented along the direction of the electric field, and the dichroic dye molecules are also oriented along the direction of the electric field. The reflective layer substrate 3 is used for the reflection of light.

[0026] In a preferred solution, the lower substrate 2 includes a flexible substrate 201, which is a PI film, a PET film, or a TAC film, and a metal reflective layer 202 is provided on the flexible substrate 201. With this structure, the lower substrate 2 serves as the electrode layer of the lower layer, and because the metal reflective layer 202 is provided on the lower substrate 2, the lower substrate 2 also serves as a reflective layer. The production cost and production steps are greatly reduced, and the lower substrate 2 is efficiently used. The structure is light.

[0027] The metal reflective layers 202 of the upper substrate 1 and the lower substrate 2 serve as upper and lower electrodes. By energizing the metal reflective layer 202 of the lower substrate 2 and energizing the pixelated electrodes 102 of specific pixels of the upper substrate 1, pixelation control of the overall structure can be achieved.

[0028] Polyimide film (PI) has high strength and high modulus, and can withstand large external forces without being easily deformed or damaged. When used as a flexible substrate, it can provide good support for display devices.

[0029] Polyethylene terephthalate film (PET) has high transparency and low light absorption in the visible light range, which enables it to effectively transmit light in display devices and is conducive to obtaining clear display effects. Its haze can usually be controlled at a low level, ensuring good optical clarity.

[0030] Triacetyl cellulose (TAC) film has good optical transparency and low birefringence. In optical components such as polarizers, this property can effectively adjust the polarization state of light, thereby improving the contrast and color reproduction of display devices.

[0031] In the preferred solution, the substrate 101 of the upper substrate 1 has the same structure as the flexible substrate 201. The first glass substrate 103 is provided at the bottom of the substrate 101 of the upper substrate 1. The metal reflective layer 202 serves as the common electrode of the lower substrate 2. The pixelated electrode 102 of the upper substrate 1 is energized with the metal reflective layer 202. With this structure, the first glass substrate 103 has a very high flatness. During the entire manufacturing process, a high temperature step may be involved. The first glass substrate 103 can withstand these temperature changes without significant deformation, thereby ensuring the stability and accuracy of the structure of the upper substrate 1 prepared thereon. The first glass substrate 103 has high transparency and low absorption. The high transparency and low light absorption can ensure that light passes smoothly. After the preparation of the metal reflective layer 202 on the flexible substrate 201 is completed, the flexible substrate 201 needs to be peeled off from the first glass substrate 103. The first glass substrate 103 is the basis for the manufacture of the flexible lower substrate in the early stage, and the peeled flexible lower substrate can be used independently in the reflective display device.

[0032] In the preferred embodiment, the dichroic dye 4 is a rectangular structure, a first charged terminal 401 is provided at one end of the dichroic dye 4, a second charged terminal 402 is provided at the other end of the dichroic dye 4, a grid is provided between the upper substrate 1 and the lower substrate 2, the liquid crystal slurry 5 is installed in the grid, a first electrode 6 is provided on one side of the upper substrate 1, a second electrode 7 is provided on the other side of the upper substrate 1, and the first electrode 6 and the second electrode 7 are installed on the grid.

[0033] Embodiment 2: A method for manufacturing a reflective device based on polymer dispersed liquid crystal, characterized by: S1, preparing a liquid crystal slurry; S2, preparation of upper substrate 1 and lower substrate 2; S3, placing the liquid crystal slurry 5 between the upper substrate 1 and the lower substrate 2; S4, a polymerization process is used to polymerize the polymerizable monomer 501 to form a polymer dispersed liquid crystal PDLC; S5, preparing the reflective layer substrate 3; S6 , power is supplied to the upper substrate 1 and the lower substrate 2 .

[0034] Embodiment 3: Further explanation in conjunction with Example 1: The liquid crystal slurry 5 includes a dichroic dye 4, which can be a mixture of dichroic dyes of various colors to present black. When the arrangement direction of the dye molecules is inconsistent with the direction of the light, it has a strong absorption effect on the light; when the arrangement direction of the dye molecules is consistent with the direction of the light, its absorption effect on the light will be greatly weakened or even disappear. The dichroic dye 4 is a spherical structure.

[0035] A pixelated electrode 102 is prepared on white glass; the pixelated electrode 102 includes a conductive layer, a thin film transistor correspondingly connected to the conductive layer, and a related driving circuit.

[0036] Liquid crystal slurry 5 is placed between the upper and lower electrodes by liquid crystal drop process (ODF), vacuum perfusion or capillary action, and the thickness of the liquid crystal slurry 5 is controlled by spacer particles such as silicon balls or polystyrene; The photopolymerizable monomer is photopolymerized, and the thermally polymerizable monomer is thermally polymerized to form a polymer dispersed liquid crystal (PDLC). In S5, a whole-surface second reflective layer 302 is prepared on the white glass; the material of the second reflective layer 302 includes but is not limited to silver and aluminum.

[0037] The prepared polymer dispersed liquid crystal (PDLC) and the reflective layer substrate 3 are placed in a box by a liquid crystal drop process (ODF). Due to the scattering effect of the PDLC and the absorption effect of the dichroic dye 4, the whole is black. The pixelated electrodes 102 of the upper substrate 1 and the pixelated electrodes of the lower substrate 2 are partially electrified, and the electrified parts are white patterns, while the un-electrified parts remain black.

[0038] When the upper and lower pixelated electrodes 102 of certain sub-pixels of specific colors are energized, the liquid crystal in the liquid crystal droplets between the pixelated electrodes 102 is oriented along the electric field direction, and the dichroic dye 4 molecules are also oriented along the electric field direction. Since the scattering effect of the PDLC disappears, the absorption effect of the dichroic dye 4 is also weakened or even disappears, and the light can directly hit the second reflective layer 302 under the PDLC and be reflected by the white second reflective layer 302, so that the second reflective layer 302 appears white, and other areas remain black, thereby displaying a white pattern on the black substrate.

[0039] Embodiment 4: Further explanation in conjunction with Example 1: The dichroic dye 4 is a spherical structure. The liquid crystal slurry 5 includes the dichroic dye 4, which can be a mixture of dichroic dyes of various colors to present black. When the arrangement direction of the dye molecules is inconsistent with the direction of the light, it has a strong absorption effect on the light; when the arrangement direction of the dye molecules is consistent with the direction of the light, its absorption effect on the light will be greatly weakened or even disappear.

[0040] In S2, during the preparation of the upper substrate 1, a flexible substrate of the upper substrate 1 is adhered to the first glass substrate 103, and the flexible substrate of the upper substrate 1 includes but is not limited to a PI film, a PET film, and a TAC film; The pixelated electrodes 102 are sequentially prepared on the substrate 101. The pixelated electrodes 102 include a conductive layer and a thin film transistor (TFT) correspondingly connected to the conductive layer, and a related driving circuit. Subsequently, the flexible lower substrate prepared on the first glass substrate 103 is peeled off from the first glass substrate 103, thereby obtaining a flexible upper substrate 1.

[0041] During the preparation of the lower substrate 2, the flexible substrate 201 is adhered to the second glass substrate 203, and a full-surface metal reflective layer 202 is prepared on the flexible substrate 201. The metal reflective layer 202 is the common electrode of the lower substrate 2. The flexible substrate 201 of the lower substrate 2 includes but is not limited to PI film, PET film, and TAC film.

[0042] Peeling the upper substrate 1 and the lower substrate 2 off the glass substrate; The liquid crystal slurry 5 is placed between the upper substrate 1 and the lower substrate 2 by a roll-to-roll production process; A polymerization process is used to polymerize the polymerizable monomer 501 in the liquid crystal slurry 5 to form a PDLC. Photopolymerizable monomers are formed by photopolymerization, and thermal polymerizable monomers are formed by thermal polymerization.

[0043] The second reflective layer 302 serves as the reflective layer substrate 3, and the reflective layer substrate 3 does not need to be prepared. The second reflective layer 302 also serves as a common electrode of the lower substrate.

[0044] The second reflective layer 302 and the local pixelated electrode 102 are electrified. The second reflective layer 302 of the lower substrate 2 is electrified, and the specific pixelated electrode 102 of the upper substrate 1 is electrified at the same time, so that the pixelation control can be realized.

[0045] Embodiment 5: Combined with the description of Examples 1 to 4, as shown in the attached Figures 10-12 The dichroic dye 4 between the upper substrate 1 and the lower substrate 2 is a rectangular structure, the bottom of the lower substrate 2 is a reflective layer substrate 3, and the reflective layer substrate 3 includes a second substrate 301 and a second reflective layer 302. A first charged terminal 401 is provided at one end of the dichroic dye 4, and a second charged terminal 402 is provided at the other end of the dichroic dye 4. A grid is provided between the upper substrate 1 and the lower substrate 2, and a liquid crystal slurry 5 is installed in the grid. A first electrode 6 is provided on one side of the upper substrate 1, and a second electrode 7 is provided on the other side of the upper substrate 1. The first electrode 6 and the second electrode 7 are installed on the grid.

[0046] With this structure, both ends of the dichroic dye 4 are charged. When the overall structure does not reflect, the first electrode 6 and the second electrode 7 are driven to make the multiple dichroic dyes 4 face horizontally, so that the proportion of the receiving surface of the dichroic dye 4 in the vertical direction of the rectangular structure is more, so that the liquid crystal slurry 5 with the same concentration of dichroic dye 4 can absorb more light, so that the black situation displayed by the overall structure is more enhanced. So that the display effect of the overall structure is better. When the overall structure needs to reflect and display, the first electrode 6 and the second electrode 7 are disconnected, so that the multiple dichroic dyes 4 are irregular.

[0047] When the overall device needs to achieve a black display situation that can be recognized by the human eye, a smaller concentration of the dichroic dye 4 can be used to achieve the black display that can be recognized by the human eye, which can greatly reduce the concentration of the dichroic dye 4 and greatly reduce costs.

[0048] Embodiment 6: Combined with the description of Examples 1 to 4, as shown in the attached Fig.13 The dichroic dye 4 between the upper substrate 1 and the lower substrate 2 is a rectangular structure, and the metal reflective layer 202 of the lower substrate 2 serves as both a reflective layer and an electrode layer.

[0049] A first charged terminal 401 is provided at one end of the dichroic dye 4, and a second charged terminal 402 is provided at the other end of the dichroic dye 4. A grid is provided between the upper substrate 1 and the lower substrate 2, and the liquid crystal slurry 5 is installed in the grid. A first electrode 6 is provided on one side of the upper substrate 1, and a second electrode 7 is provided on the other side of the upper substrate 1. The first electrode 6 and the second electrode 7 are installed on the grid.

[0050] The two ends of the dichroic dye 4 are charged. When the overall structure does not reflect, the first electrode 6 and the second electrode 7 are driven to make the multiple dichroic dyes 4 face horizontally, so that the proportion of the receiving surface of the dichroic dye 4 in the vertical direction of the rectangular structure is more, so that the liquid crystal slurry 5 with the same concentration of dichroic dye 4 can absorb more light, so that the black situation displayed by the overall structure is more enhanced. So that the display effect of the overall structure is better. When the overall structure needs to reflect and display, the first electrode 6 and the second electrode 7 are disconnected, so that the multiple dichroic dyes 4 are irregular.

[0051] When the overall device needs to achieve a black display situation that can be recognized by the human eye, a smaller concentration of the dichroic dye 4 can be used to achieve the black display that can be recognized by the human eye, which can greatly reduce the concentration of the dichroic dye 4 and greatly reduce costs.

[0052] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A reflective device based on polymer dispersed liquid crystal, characterized in that: The invention comprises an upper substrate (1), a lower substrate (2) is provided at the bottom of the upper substrate (1), a liquid crystal slurry (5) is provided between the upper substrate (1) and the lower substrate (2), the liquid crystal slurry (5) comprises a polymerizable monomer (501) and a dichroic dye (4), the upper substrate (1) comprises a substrate (101), a plurality of pixelated electrodes (102) are provided on the substrate (101), and the dichroic dye (4) is black.

2. A reflective device based on polymer dispersed liquid crystal according to claim 1, characterized in that: The dichroic dye (4) is a positive dichroic dye, and the liquid crystal slurry (5) comprises liquid crystal and an initiator.

3. A reflective device based on polymer dispersed liquid crystal according to claim 1, characterized in that: The lower substrate (2) has the same structure as the upper substrate (1); a reflective layer substrate (3) is provided at the bottom of the lower substrate (2); the reflective layer substrate (3) comprises a second substrate (301); and a second reflective layer (302) is provided on the second substrate (301).

4. A reflective device based on polymer dispersed liquid crystal according to claim 3, characterized in that: The second substrate (301) has the same structure as the substrate (101); the substrate (101) comprises a conductive layer and thin film transistors connected to the conductive layer; the pixelated electrode (102) of the upper substrate (1) and the pixelated electrode of the lower substrate (2) are electrically connected.

5. A reflective device based on polymer dispersed liquid crystal according to claim 1, characterized in that: The lower substrate (2) comprises a flexible substrate (201), the flexible substrate (201) is a PI film, a PET film or a TAC film, and a metal reflective layer (202) is provided on the flexible substrate (201).

6. A reflective device based on polymer dispersed liquid crystal according to claim 5, characterized in that: The substrate (101) of the upper substrate (1) has the same structure as the flexible base (201); a first glass substrate (103) is provided at the bottom of the substrate (101) of the upper substrate (1); the metal reflective layer (202) serves as a common electrode of the lower substrate (2); and the pixelated electrode (102) of the upper substrate (1) and the metal reflective layer (202) are electrically connected.

7. A reflective device based on polymer dispersed liquid crystal according to claim 1, characterized in that: The dichroic dye (4) is a rectangular structure; one end of the dichroic dye (4) is provided with a first charged terminal (401); the other end of the dichroic dye (4) is provided with a second charged terminal (402); a grid is provided between the upper substrate (1) and the lower substrate (2); a liquid crystal slurry (5) is installed in the grid; one side of the upper substrate (1) is provided with a first electrode (6); the other side of the upper substrate (1) is provided with a second electrode (7); and the first electrode (6) and the second electrode (7) are installed on the grid.

8. A method for manufacturing a reflective device based on polymer dispersed liquid crystal according to any one of claims 1 to 7, characterized in that: S1, preparing liquid crystal slurry; S2, preparing an upper substrate (1) and a lower substrate (2); S3, placing a liquid crystal slurry (5) between the upper substrate (1) and the lower substrate (2); S4, a polymerization process to polymerize the polymerizable monomer (501) to form a polymer dispersed liquid crystal (PDLC); S5, preparing a reflective layer substrate (3); S6. Power is supplied to the upper substrate (1) and the lower substrate (2).

9. A method for manufacturing a reflective device based on polymer dispersed liquid crystal according to claim 8, characterized in that: in S2, a pixelated electrode (102) is prepared on white glass; In S3, a liquid crystal slurry (5) is placed between the upper and lower electrodes by liquid crystal droplet deposition (ODF), vacuum infusion or capillary action, and the thickness of the liquid crystal slurry (5) is controlled by using spacer particles such as silicon balls or polystyrene; In S4, the photopolymerizable monomer is photopolymerized and the thermally polymerizable monomer is thermally polymerized to form a polymer dispersed liquid crystal (PDLC); In S5, a second reflective layer (302) is formed on the entire surface of the white glass; The prepared polymer dispersed liquid crystal (PDLC) and the reflective layer substrate (3) are aligned in a box by a liquid crystal drop process (ODF) so that the entire surface appears black; In S6, the pixelated electrodes (102) of the local upper substrate (1) and the pixelated electrodes of the local lower substrate (2) are energized, and the energized parts are white patterns, while the unenergized parts remain black.

10. The method for manufacturing a reflective device based on polymer dispersed liquid crystal according to claim 8, characterized in that: S2 In the production of the middle and upper substrates (1), the flexible substrate of the upper substrate (1) is adhered to the first glass substrate (103); in the production of the lower substrate (2), the flexible substrate (201) is adhered to the second glass substrate (203); a metal reflective layer (202) is prepared on the entire surface of the flexible substrate (201); the metal reflective layer (202) is a common electrode of the lower substrate (2); Peeling the upper substrate (1) and the lower substrate (2) off the glass substrate; In S3, a liquid crystal slurry (5) is placed between the upper substrate (1) and the lower substrate (2) through a roll-to-roll production process; In S5, the second reflective layer (302) serves as the reflective layer substrate (3), and the reflective layer substrate (3) does not need to be prepared. In S6, power is supplied to the second reflective layer (302) and the local pixelated electrode (102).

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