High-contrast dimming device based on multi-section black light absorption retaining wall and preparation method of high-contrast dimming device

Abstract

The high-contrast dimming device comprises a first substrate and a second substrate which are oppositely arranged, electrode layers are arranged on the opposite faces of the first substrate and the second substrate, and a gap between the first substrate and the second substrate is filled with polymer dispersed liquid crystals to form a dimming display area; a plurality of black light absorption retaining walls connected between the first substrate and the second substrate are distributed in the dimming display area, and the dimming display area is divided into a plurality of display units; the black light-absorbing retaining wall comprises a first light-absorbing part close to the first substrate, a second light-absorbing part close to the second substrate, and a connecting part vertically connected between the first light-absorbing part and the second light-absorbing part. According to the invention, the problem of low two-state contrast of a dimming product in a complex ambient light scene is effectively solved, and the contrast of the dimming product is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer dimming, and in particular to a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall and a preparation method thereof. Background Art

[0002] Polymer Dispersed Liquid Crystal (PDLC) is a composite material in which liquid crystal molecules are dispersed in a polymer matrix. Due to the birefringence of liquid crystal molecules, when light passes through the PDLC layer, transmission and scattering can occur. By controlling the state of PDLC, light can be regulated. Therefore, PDLC is widely used in office partitions, light-controlled windows, projection screens and other fields. By doping dichroic dyes in polymer liquid crystals, the switching between the transparent state and the scattering state of PDLC can be made more precise, and the transmittance can be controlled by adjusting the concentration of dichroic dyes. This technology has been widely used in fields such as displays and optical communications.

[0003] However, current dimming products generally have the problem of low contrast between the two states. Some dimming products reduce the transmittance of the scattered state by adding low-transmittance PVB film interlayer, but at the same time, the transmittance of the transparent state will be reduced in proportion, which does not help improve the contrast. This limits its application in scenarios that require a high ratio of the two-state transmittance, such as car sunroofs. For this reason, some researchers have shifted their research focus to adding light-absorbing structures.

[0004] The invention with publication number CN114527588A discloses a polymer liquid crystal dimming box, a display module and an electronic device, including: a first substrate; a second substrate, arranged opposite to the first substrate; a polymer liquid crystal layer, arranged between the first substrate and the second substrate; a frame glue, arranged between the first substrate and the second substrate, surrounding the polymer liquid crystal layer; wherein the frame glue is a black frame glue. The invention sets the frame glue in the polymer liquid crystal dimming box to black, and utilizes the light absorption characteristics of the black frame glue to absorb ultraviolet light during the curing process of the frame glue, thereby alleviating the problem that the ultraviolet light passes through the frame glue and irradiates the polymer liquid crystal, causing the polymer liquid crystal to cure prematurely, and alleviates the problem of edge failure of the polymer liquid crystal dimming box. However, the purpose of the invention is to absorb ultraviolet light during the curing process of the frame glue, and it cannot improve the transmitted light in most dimming areas, and naturally cannot effectively increase the contrast.

[0005] The invention with publication number CN105810718B discloses an OLED display panel and a preparation method thereof, which can improve the effect of ambient light on the contrast of the OLED display panel. The OLED display panel includes a display area, and the display area includes a light-emitting area and a non-light-emitting area; the light-emitting area includes an anode, a cathode, and an organic material functional layer arranged between the anode and the cathode, which are arranged on a transparent substrate; it also includes a dimming structure arranged in the light-emitting area and located on the light-emitting side, and a light-absorbing layer arranged in the non-light-emitting area; the dimming structure is used to inject part of the external ambient light directed to the light-emitting side of the OLED display panel into the light-absorbing layer; the light-absorbing layer is used to absorb light. The invention is used to improve the effect of ambient light on the contrast of the OLED display panel. Similarly, the light-absorbing layer of the invention is also arranged in the non-light-emitting area. For dimming products such as car sunroofs, the non-light-emitting area only has a frame part, and naturally cannot effectively increase the contrast of the dimming area.

[0006] The invention with publication number US20040256978A1 discloses an array of organic electronic devices including a black lattice and a method for forming the same. By reducing the background luminescence from an ambient radiation source, the electronic device array has an improved contrast. The background luminescence is reduced by using the black lattice itself and the black layer used between the openings in the black lattice. The black lattice, the black layer or both can be achieved by using a high absorbance material, a low reflectivity layer or a combination of the two. The low reflectivity layer can be designed to reduce the reflectivity by optimizing the thickness of the layer or the material at the interface. The combination of the black lattice and the black layer in at least one set of electrodes can provide very low background luminescence while still maintaining a good ratio of open light to off light. The purpose of the invention is to use a black lattice to reduce the background luminescence from an ambient radiation source. However, in addition to increasing the contrast, dimming products also need to increase the transmittance of the ambient radiation source when the ambient light is not strong.

[0007] The invention with publication number CN110892001B discloses an electrochromic polymer and its synthesis and use, the excellent properties of which are, for example, absorbance in the entire visible spectrum and a significant color change from black to transmissive under applied voltage. In addition, the invention also relates to a black to transmissive electrochromic polymer film including a black to transmissive electrochromic polymer, and an electrochromic device including a black to transmissive electrochromic polymer or film. The invention can realize a black or transmissive dimming film using a black electrochromic polymer, but in practical applications, it can only realize color change with black as the main color, and the effect of the transmissive state is not good, and it cannot adapt to applications in multiple scenarios.

[0008] In summary, although some researchers have proposed adding light-absorbing structures to display products to improve the light-absorbing performance of the products, for application scenarios with a high two-state transmittance ratio and complex ambient light angles such as car sunroofs, dimming products are required to adapt to ambient light to achieve high transmittance and high shading performance. Therefore, for dimming products in such scenarios, how to design a black light-absorbing structure has become an urgent problem to be solved. Summary of the invention

[0009] The purpose of the present invention is to disclose a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall and a preparation method thereof, which effectively solves the problem of low two-state contrast of dimming products in complex ambient light scenes and significantly improves the contrast of dimming products.

[0010] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0011] In a first aspect, the present invention discloses a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall, the high-contrast dimming device based on a multi-segment black light-absorbing baffle wall comprises a first substrate and a second substrate arranged opposite to each other, an electrode layer is arranged on the opposite surfaces of the first substrate and the second substrate, and a gap between the two is filled with polymer dispersed liquid crystal to form a dimming display area;

[0012] A plurality of black light-absorbing baffles connected between the first substrate and the second substrate are distributed in the dimming display area to divide the dimming display area into a plurality of display units;

[0013] The black light absorbing barrier comprises a first light absorbing portion adjacent to the first substrate, a second light absorbing portion adjacent to the second substrate, and a connecting portion vertically connected between the first light absorbing portion and the second light absorbing portion.

[0014] The first light absorbing portion and the second light absorbing portion are both horizontal to the first substrate.

[0015] The connecting portion is made of a light absorbing material, and the thickness of the connecting portion is smaller than the thickness of the first light absorbing portion and the second light absorbing portion.

[0016] The connecting part is made of colorless and transparent material.

[0017] The first light absorbing portion, the connecting portion, and the second light absorbing portion are located on the same straight line and form an angle with the first substrate.

[0018] The width of each display unit is less than twice the thickness of the black light-absorbing blocking wall.

[0019] The first light absorbing part and the second light absorbing part are prepared by using ink, graphene or carbon nanotubes.

[0020] The black light-absorbing retaining wall is made of black electrochromic material;

[0021] The first and second substrates are provided with mutually independent first and second electrode layers on opposite surfaces, and voltages are applied to the black light absorbing baffles and the display unit respectively to switch and control the dimming states of the black light absorbing baffles and the display unit.

[0022] A connecting portion is provided at the top of the substrate, for connecting one end of all the black light-absorbing baffles distributed in the dimming area together;

[0023] The first electrode layer corresponds to the connection part, and the dimming state of the black light-absorbing barrier is switched and controlled by applying a voltage to the connection part.

[0024] In a second aspect, the present invention discloses a method for preparing a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall, the preparation method comprising the following steps:

[0025] Collect the light parameters of the environment where the dimming device is located in real time to obtain the incident light angle range and corresponding light intensity distribution data at different time periods;

[0026] According to the acquired data, three time period types are obtained, corresponding to transparent state, scattered state and optional state respectively;

[0027] The minimum light intensity in the scattered state and the maximum light intensity in the transparent state are respectively determined, and the permissible penetration angle ranges of the incident light in the scattered state and the transparent state are respectively calculated;

[0028] According to the permissible penetration angle range of incident light in the scattered state and transparent state, the structural parameters of the multi-section black light-absorbing retaining wall are designed;

[0029] Electrode layers are respectively prepared on opposite surfaces of a first substrate and a second substrate that are arranged opposite to each other;

[0030] The first light absorbing portion and the second light absorbing portion are respectively prepared on the first substrate and the second substrate provided with the electrode layer by coating, etching, 3D printing and other processes;

[0031] The polymer dispersed liquid crystal layer is coated on the first substrate or the second substrate by rolling, and the first substrate and the second substrate are attached and fixed, so that the polymer dispersed liquid crystal layer is filled in the liquid crystal box formed by the first substrate and the second substrate.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The high-contrast dimming device based on a multi-segment black light-absorbing baffle and the preparation method thereof of the present invention, by adding a black light-absorbing baffle in the polymer dispersed liquid crystal layer and being able to specifically design the structure and parameters of the black light-absorbing baffle according to actual needs, can adapt to ambient light with varying angles while achieving high light transmittance and high contrast, so that the polymer dispersed liquid crystal has a wider application prospect in the fields of office partitions, light-controlled windows, projection screens, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A top view of a strip-shaped black light-absorbing retaining wall in Example 1;

[0035] Figure 2 This is a cross-sectional view of a strip-shaped black light-absorbing baffle wall of Example 1;

[0036] Figure 3 A top view of a honeycomb-shaped black light-absorbing retaining wall in Example 1;

[0037] Figure 4 It is a principle diagram of the optical path of the high-contrast dimming device based on the multi-segment black light-absorbing baffle wall in the light-transmitting state of the present invention;

[0038] Figure 5 It is a principle diagram of the optical path of the high contrast dimming device based on the multi-segment black light-absorbing baffle wall in the scattering state of the present invention;

[0039] Figure 6 This is a light absorption principle diagram of the multi-segment black light-absorbing baffle wall in embodiment 2 in a transmission state;

[0040] Figure 7 This is a light absorption principle diagram of the multi-segment black light-absorbing baffle wall in the scattering state of Example 2;

[0041] Figure 8 Schematic diagram of a multi-segment black light-absorbing baffle wall when it is a transparent connecting portion of Example 3;

[0042] Fig. 9 This is a schematic diagram of the oblique black light-absorbing retaining wall of Example 4;

[0043] Fig.10 Top view of the black light-absorbing barrier made of black electrochromic material. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0045] The present invention discloses a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall, the high-contrast dimming device based on a multi-segment black light-absorbing baffle wall comprises a first substrate and a second substrate arranged opposite to each other, an electrode layer is arranged on the opposite surfaces of the first substrate and the second substrate, and a gap between the two is filled with polymer dispersed liquid crystal to form a dimming display area;

[0046] A plurality of black light-absorbing baffles connected between the first substrate and the second substrate are distributed in the dimming display area to divide the dimming display area into a plurality of display units;

[0047] The black light absorbing barrier comprises a first light absorbing portion adjacent to the first substrate, a second light absorbing portion adjacent to the second substrate, and a connecting portion vertically connected between the first light absorbing portion and the second light absorbing portion.

[0048] Preferably, the material of the black light-absorbing barrier added in the polymer dispersed liquid crystal layer can be any black light-absorbing material such as ink, graphene, carbon nanotubes, etc.

[0049] Example 1

[0050] See also Figure 1 and Figure 2 A strip-shaped black light-absorbing baffle is disposed between the first substrate and the second substrate. In Example 1, the black light-absorbing baffle may also adopt a honeycomb structure, with a side length of 25 um, a wall thickness of 10 um, and a height of 25 um, that is, the thickness of the polymer dispersed liquid crystal layer is 25 um. For details, see Figure 3 The design of the honeycomb structure can increase the surface area of ​​the black light-absorbing baffle, thereby improving its light absorption efficiency. In Example 1, the black light-absorbing baffle is made of graphene material. Graphene has a unique electronic band structure and a higher specific surface area, and can absorb light efficiently.

[0051] See also Figure 4 and Figure 5 When the polymer dispersed liquid crystal is in a transparent state, the black light-absorbing baffle only absorbs the light directly incident on the black baffle, and the light in other areas is not scattered and will not be incident on the black light-absorbing baffle, and thus will not be absorbed; when the polymer dispersed liquid crystal is in a scattering state, the black light-absorbing baffle will not only absorb the light directly incident on the black baffle, but also absorb the light scattered on the black baffle in other areas. As a result, the incident light absorbed by the black light-absorbing baffle is less in the transparent state than in the scattering state, thereby significantly improving the contrast between the transparent state and the scattering state.

[0052] The contrast ratio was tested using a Color Spectrum CS-700 haze meter. The test results show that the contrast ratio of the polymer dispersed liquid crystal display device with striped black light-absorbing walls is 100% higher than that of the polymer dispersed liquid crystal display device without black light-absorbing walls.

[0053] For Example 1, the width of the black light-absorbing baffle is as small as possible, preferably less than 10um, more preferably less than 5um, and more preferably less than 2um, so as to minimize the proportion of vertical incident light absorbed. Other areas are divided into several display areas by the black light-absorbing baffle, and the width or diameter of the display area is less than 2 times the thickness of the black light-absorbing baffle, preferably less than or equal to the thickness of the black light-absorbing baffle. The black light-absorbing baffle structure of Example 1 is suitable for scenes with a small inclination of the light source, or application scenes with low requirements for the transmittance of the oblique light source. Table 1 is the test data of Example 1.

[0054] Table 1

[0055] Power-off scattering state transmittance Transmittance of the powered transparent state Two-state contrast Conventional black PDLC 4.3％ 25.8％ 5.9 Conventional black PDLC+30% light reduction film 1.3％ 7.6％ 5.8 Example 1 1.2％ 15.3 12.8

[0056] In certain application scenarios, the angle of ambient light is complex or even changeable, and users have high requirements for the light transmittance and contrast of dimming products. Taking the dimming glass used in car sunroofs as an example, the dimming glass is used in car sunroofs mainly to solve the problem of rising temperature in the car due to sun exposure in summer. Generally, the temperature is high at noon (equivalent to the small incident angle of the sun incident on the car sunroof), and the temperature is low in the morning and afternoon (equivalent to the large incident angle of the sun incident on the car sunroof). At this time, the dimming glass needs to absorb more incident sunlight at noon to play a strong heat-insulating role; and when a strong heat-insulating function is not needed in the morning and afternoon, more ambient light is transmitted to increase the brightness in the car. Only using the striped structure of Example 1 can certainly improve the contrast, but it will inevitably reduce the light transmittance in the morning and afternoon.

[0057] Example 2

[0058] To this end, Example 2 proposes a new type of black light-absorbing baffle structure, which can effectively adjust the transmittance and contrast under ambient light in a wide angle range. The black light-absorbing baffle includes a first light-absorbing portion adjacent to the first substrate, a second light-absorbing portion adjacent to the second substrate, and a connecting portion vertically connected between the first light-absorbing portion and the second light-absorbing portion. The first light-absorbing portion and the second light-absorbing portion are both horizontal to the first substrate. The connecting portion is made of a light-absorbing material, and the thickness of the connecting portion is less than the thickness of the first light-absorbing portion and the second light-absorbing portion.

[0059] See also Figure 6 When the incident light angle is large, assuming that the switchable glass is in a clear state, the light incident on the first light absorbing part and the second light absorbing part A1 is strongly absorbed, the light incident on the connecting part B1 is partially absorbed and then transmitted out, and the light that is not incident on the black light absorbing wall is directly transmitted out. Figure 7When the incident light angle is small, assuming that the dimming glass is in a scattered state, the light directly incident on the black light-absorbing baffle is strongly absorbed, and the light scattered by the PDLC on the black light-absorbing baffle is also strongly absorbed or partially absorbed, and the light not scattered on the black light-absorbing baffle is transmitted out. In Example 2, the width or diameter of the display area is also less than 2 times the thickness of the black light-absorbing baffle, preferably less than or equal to the thickness of the black light-absorbing baffle.

[0060] Example 2 can take into account both the transmittance and contrast when the light source angle range is large and variable. The requirements of different incident light angles in different scenes are met by adjusting the ratio between the width of the first / second light absorbing portion and other areas without black baffles. Table 2 is the test data of Example 2.

[0061] Table 2

[0062]

[0063] Example 3

[0064] The black light absorbing wall of Example 3 includes a first light absorbing portion adjacent to the first substrate, a second light absorbing portion adjacent to the second substrate, and a connecting portion vertically connected between the first light absorbing portion and the second light absorbing portion. The first light absorbing portion and the second light absorbing portion are both horizontal to the first substrate. The connecting portion is made of a colorless transparent material, and has a connecting support function. The horizontal distance between the first light absorbing portion and the second light absorbing portion in Example 3 can be set very small, such as Figure 8 As shown, the first light absorbing part and the second light absorbing part are arranged in a staggered manner, which can effectively absorb light in multiple angle ranges, especially vertically incident light. Only obliquely incident light sources in a preset angle range can completely penetrate the polymer layer. The structure of Example 3 is particularly suitable for occasions where the light is strong or the angle range of the incident light changes little. The vertically incident or small-angle incident light (corresponding to the sunlight at noon) is absorbed by the black light absorbing baffle, which plays a role in heat insulation and cooling; the light with a large angle incident (corresponding to the sunlight in the morning / afternoon) is directly transmitted, so that the interior of the car has better brightness. Example 3 can also achieve a relatively high contrast ratio. The requirements of different incident light angles in different scenes are met by adjusting the width of the first and second light absorbing parts. Table 3 is the test data of Example 3.

[0065] Table 3

[0066]

[0067] Example 4

[0068] See also Fig. 9 The first / second connecting portion B1 in the black light absorbing wall of Example 4 is located on the first / second substrate respectively, and the light absorbing portion A1 is located between the first substrate and the second substrate and forms an angle with the first substrate. The width of each display unit is less than 2 times the thickness of the black light absorbing wall.

[0069] The vertically incident or small-angle incident light (corresponding to the sunlight at noon) is absorbed by the black light-absorbing baffle wall, which plays a role in heat insulation and cooling; the large-angle incident light at a specific angle (corresponding to the sunlight in the morning / afternoon) is directly transmitted, so that the interior of the car has a better brightness. The dimming product of Example 4 can only allow incident light within a specific angle range to pass through. Table 4 is the test data of Example 4.

[0070] Table 4

[0071]

[0072] Example 5

[0073] In Example 5, the black light-absorbing baffle is made of black electrochromic material. Fig.10 The first substrate and the second substrate are provided with a first electrode layer and a second electrode layer independent of each other on opposite surfaces, and a pattern such as Fig.10 The electrodes in the C1 region shown are used to drive the light-absorbing baffles of the electronic color-changing material. The electrode layer on the other side does not need to be etched. Voltages are applied to the black light-absorbing baffles and the display unit respectively to switch and control the dimming states of the black light-absorbing baffles and the display unit. A connecting portion is provided at the top of the substrate to connect one end of all the black light-absorbing baffles distributed in the dimming area together; when a voltage is applied to the C1 region electrode and the electrode layer on the other side, the black light-absorbing baffles are driven; when a voltage is applied to the D1 region electrode and the electrode layer on the other side, the polymer dispersed liquid crystal is driven.

[0074] exist Fig.10 In the embodiment, electrochromic material is set in the C1 area, and polymer dispersed liquid crystal is filled in other areas. When the polymer dispersed liquid crystal is driven to the transparent state, the black light-absorbing baffle is also driven to the transparent state, and the incident light will not be additionally absorbed by the black light-absorbing baffle; when the polymer dispersed liquid crystal is driven to the scattering state, the black light-absorbing baffle is driven to the black light-absorbing state, and the incident light scattered by the polymer dispersed liquid crystal to the black light-absorbing baffle will be absorbed, thereby further improving the contrast. This solution is suitable for black light-absorbing baffles of various structures.

[0075] The present invention discloses a method for preparing a high-contrast dimming device based on a multi-segment black light-absorbing retaining wall, the method comprising the following steps:

[0076] S1, collecting light parameters of the environment where the dimming device is located in real time, and obtaining the incident light angle range and corresponding light intensity distribution data at different time periods.

[0077] S2, three time period types are obtained according to the acquired data, corresponding to the transparent state, the scattered state and the optional state respectively; during the optional state period, the user can choose the transparent state and the scattered state according to their own habits; preferably, this embodiment is obtained by statistically analyzing the user history switching data of the dimming product, and the time period type to which different time periods belong is determined according to the use probability of different transparent states in each time period.

[0078] S3, respectively confirm the minimum light intensity in the scattered state and the maximum light intensity in the transparent state, and respectively calculate the allowable penetration angle range of the incident light in the scattered state and the transparent state and the corresponding light intensity data. In this embodiment, only the light intensity parameters in the scattered state and the transparent state are considered, and on this basis, the allowable penetration angle range and light intensity data of the two dimming states are calculated. After combining the two ranges, the maximum allowable penetration angle range and light intensity data of the dimming product are obtained, and then the optimal allowable penetration angle range is selected by analyzing the contrast.

[0079] S4, according to the optimal permissible penetration angle range and light intensity data of the incident light in the scattered state and transparent state, the structural parameter design of the multi-segment black light-absorbing retaining wall is carried out. The light transmittance and light absorption of retaining walls with different size parameters can be obtained through preliminary tests.

[0080] S5, preparing electrode layers on opposite surfaces of the first substrate and the second substrate respectively.

[0081] S6, preparing a first light absorbing portion and a second light absorbing portion respectively on the first substrate and the second substrate provided with the electrode layer by coating, etching, 3D printing or other processes.

[0082] S7, coating the polymer dispersed liquid crystal layer on the first substrate or the second substrate by rolling, laminating and fixing the first substrate and the second substrate, so that the polymer dispersed liquid crystal layer fills the liquid crystal box formed by the first substrate and the second substrate.

[0083] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code. The scheme in the embodiments of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0084] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0085] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0087] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0088] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A high contrast dimming device based on a multi-segment black light-absorbing baffle wall, characterized in that: The device comprises a first substrate and a second substrate arranged opposite to each other, an electrode layer is arranged on the opposite surfaces of the first substrate and the second substrate, and a gap between the first substrate and the second substrate is filled with polymer dispersed liquid crystal to form a dimming display area; A plurality of black light-absorbing baffles connected between the first substrate and the second substrate are distributed in the dimming display area to divide the dimming display area into a plurality of display units; The black light absorbing barrier comprises a first light absorbing portion adjacent to the first substrate, a second light absorbing portion adjacent to the second substrate, and a connecting portion vertically connected between the first light absorbing portion and the second light absorbing portion.

2. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 1, characterized in that: The first light absorbing portion and the second light absorbing portion are both horizontal to the first substrate.

3. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 2, characterized in that: The connecting portion is made of a light absorbing material, and the thickness of the connecting portion is smaller than the thickness of the first light absorbing portion and the second light absorbing portion.

4. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 2, characterized in that: The connecting part is made of colorless and transparent material.

5. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 1, characterized in that: The first light absorbing portion, the connecting portion, and the second light absorbing portion are located on the same straight line and form an angle with the first substrate.

6. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 1, characterized in that: The width of each display unit is less than twice the thickness of the black light-absorbing blocking wall.

7. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 1, characterized in that: The first light absorbing part and the second light absorbing part are prepared by using ink, graphene or carbon nanotubes.

8. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 1, characterized in that: The black light-absorbing retaining wall is made of black electrochromic material; The first and second substrates are provided with mutually independent first and second electrode layers on opposite surfaces, and voltages are applied to the black light absorbing baffles and the display unit respectively to switch and control the dimming states of the black light absorbing baffles and the display unit.

9. The high contrast dimming device based on multi-segment black light-absorbing baffle wall according to claim 8, characterized in that: A connecting portion is provided at the top of the substrate, for connecting one end of all the black light-absorbing baffles distributed in the dimming area together; The first electrode layer corresponds to the connection part, and the dimming state of the black light-absorbing barrier is switched and controlled by applying a voltage to the connection part.

10. A method for preparing a high-contrast dimming device based on a multi-segment black light-absorbing baffle wall according to any one of claims 1 to 9, characterized in that: The preparation method comprises the following steps: Collect the light parameters of the environment where the dimming device is located in real time to obtain the incident light angle range and corresponding light intensity distribution data at different time periods; According to the acquired data, three time period types are obtained, corresponding to transparent state, scattered state and optional state respectively; The minimum light intensity in the scattered state and the maximum light intensity in the transparent state are respectively determined, and the permissible penetration angle ranges of the incident light in the scattered state and the transparent state are respectively calculated; According to the permissible penetration angle range of incident light in the scattered state and transparent state, the structural parameters of the multi-section black light-absorbing retaining wall are designed; Electrode layers are respectively prepared on opposite surfaces of a first substrate and a second substrate that are arranged opposite to each other; The first light absorbing portion and the second light absorbing portion are respectively prepared on the first substrate and the second substrate provided with the electrode layer; The polymer dispersed liquid crystal layer is coated on the first substrate or the second substrate by rolling, and the first substrate and the second substrate are attached and fixed, so that the polymer dispersed liquid crystal layer is filled in the liquid crystal box formed by the first substrate and the second substrate.

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