Double-layer liquid crystal dimming film and dimming device thereof
By designing a dual-layer liquid crystal dimming film, and utilizing the segmentation and superposition of each conductive layer, dynamic switching of complex patterns is achieved, solving the problem of the single structure of traditional liquid crystal dimming films and increasing the number of dimming areas and display effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-11
- Publication Date
- 2026-03-03
AI Technical Summary
Traditional liquid crystal dimming films have a simple structure and cannot meet the diverse needs of complex patterns. Existing solutions have problems such as complex structure, high cost, and large loss of light transmittance.
The dual-layer liquid crystal dimming film structure is adopted. The conductive layer of each liquid crystal dimming film is divided into multiple conductive areas to form a unique pattern. These areas are superimposed in a non-overlapping manner. The dynamic switching of complex patterns is achieved by controlling the electric field changes of each layer through independent driving circuits.
It increases the number of dimming areas per unit area, supports dynamic switching of various complex display patterns, combines privacy dimming and decorative display functions, and reduces structural complexity and cost.
Smart Images
Figure CN223966795U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of liquid crystal dimming technology, specifically to a double-layer liquid crystal dimming film and its dimming device, which is particularly suitable for automobile windows, automobile sunroofs, building doors and windows and building curtain walls. Background Technology
[0002] Liquid crystal dimming films typically consist of a pair of transparent electrode layers and a liquid crystal layer between the electrode layers. The arrangement of liquid crystal molecules in the liquid crystal layer can change with the applied electric field, exhibiting electro-responsive characteristics. At the same time, liquid crystal molecules can be arranged in a certain degree of order through surface alignment and other methods, which can modulate the light passing through it, exhibiting optical modulation characteristics.
[0003] Due to the simultaneous electrical response and optical modulation characteristics of liquid crystal materials, they have been widely used in the display field since the 1960s and 70s. Currently, liquid crystal dimming films are widely used in building curtain walls, doors and windows, automotive sunroofs and side windows, dimming glasses, virtual reality glasses, and other products and optical devices that require dimming functions.
[0004] The application of liquid crystal dimming films in the market is increasing. The requirements for the optical performance of liquid crystal dimming films, such as haze, color, transmittance range, contrast, and dynamic pattern dimming display, especially the flexible switching display of complex dynamic patterns, are becoming more and more demanding.
[0005] Traditional liquid crystal dimming films typically employ a single-layer structure, enabling only relatively simple pattern displays and failing to meet the diverse pattern requirements of complex scenarios. In the automotive and construction industries, users have increasingly higher functional requirements for dimming devices, such as displaying complex dynamic patterns.
[0006] In existing technologies, to achieve complex patterns, multiple layers of dimming films or other display devices need to be stacked, but such solutions suffer from problems such as complex structure, high cost, and significant light transmittance loss. Therefore, there is an urgent need for a simple, double-layer liquid crystal dimming film that can support flexible switching of complex patterns. Utility Model Content
[0007] To address the aforementioned technical challenges, this application proposes a dual-layer liquid crystal dimming film. By employing patterned design of each layer of the dual-layer liquid crystal dimming film and stacking them at appropriate spatial positions, a relatively simple structure can be used to support dynamic switching of various complex display patterns, making it suitable for large-scale applications in the automotive and construction industries.
[0008] In one aspect of the present application, a double-layer liquid crystal dimming film is proposed, which includes a first liquid crystal dimming film and a second liquid crystal dimming film arranged in a stacked manner. The first liquid crystal dimming film includes a first upper conductive layer and a first lower conductive layer arranged opposite to each other, and a first liquid crystal layer located between the first upper conductive layer and the first lower conductive layer. The second liquid crystal dimming film includes a second upper conductive layer and a second lower conductive layer arranged opposite to each other, and a second liquid crystal layer located between the second upper conductive layer and the second lower conductive layer;
[0009] The first upper conductive layer and the first lower conductive layer are respectively divided into two or more conductive regions, and the divided first upper conductive layer and first lower conductive layer are superposed in space to form a first pattern; the second upper conductive layer and the second lower conductive layer are respectively divided into two or more conductive regions, and the divided second upper conductive layer and second lower conductive layer are superposed in space to form a second pattern; the first pattern and the second pattern do not coincide in space.
[0010] The double-layer liquid crystal dimming film of the present application includes a first liquid crystal dimming film and a second liquid crystal dimming film. The two conductive layers arranged opposite to each other in the first liquid crystal dimming film are divided, and the two conductive layers arranged opposite to each other in the second liquid crystal dimming film are divided. The two divided conductive layers arranged opposite to each other respectively form a first pattern and a second pattern in space. The shapes of the first pattern and the second pattern can be the same or different, but the first pattern and the second pattern do not coincide in space; for example, in a unit area, the first pattern is a "field" shape, and the second pattern can be a rhombus pattern obtained by rotating the "field" character clockwise by 45° and filling the same unit area. Then, the first pattern and the second pattern are superposed in space; the double-layer liquid crystal dimming film of the present application adopts the state of superposing two layers of liquid crystal dimming films to increase the number of dimming regions that can be adjusted in a unit area, and can support the dynamic switching of a variety of complex display patterns with a relatively simple structure.
[0011] Preferably, the first pattern and the second pattern include at least one of horizontal and vertical stripes, oblique stripes, and geometric figures.
[0012] Preferably, the first pattern is horizontal and vertical stripes, and the horizontal and vertical stripes form a grid pattern; the second pattern is a rhombus grid pattern formed by rotating the horizontal and vertical grid pattern of the first pattern clockwise by 45° around the central axis of the first pattern. Of course, the horizontal and vertical grids and the rhombus grids described here can be transformed by rotating a certain angle in terms of style, but it is not required that the grid sizes in the horizontal and vertical grids and the rhombus grids are the same; it can be understood that the first pattern is formed by horizontal and vertical stripe grids in a unit area, and the second pattern is formed by rhombus stripe grids in the same unit area.
[0013] Preferably, the first pattern consists of horizontal and vertical stripes forming a grid pattern; the second pattern is formed by translating the first pattern a certain distance along its horizontal and / or vertical directions. Of course, the description here of the second pattern being formed by translating the first pattern refers to a stylistic relationship; it can be understood that within a unit area, the blank areas created by the translation of the first pattern are filled according to the pattern of the horizontal and vertical stripes.
[0014] Preferably, both the first liquid crystal layer and the second liquid crystal layer are guest-host type liquid crystal layers.
[0015] Preferably, the transmitted light from the first liquid crystal layer is a first color, and the transmitted light from the second liquid crystal layer is a second color. The first color and the second color can be the same or different. When the first color and the second color are different, the transmitted light of the first color and the transmitted light of the second color can be combined to form the transmitted light of a third color.
[0016] Preferably, the first liquid crystal dimming film and the second liquid crystal dimming film are bonded together by an optically transparent adhesive layer.
[0017] Preferably, the adhesive layer is any one of ethylene-vinyl acetate copolymer, polyvinyl butyral, optically transparent adhesive, or self-curing adhesive.
[0018] Preferably, the thickness of the adhesive layer is 0.01mm-2mm.
[0019] Preferably, the first liquid crystal dimming film is electrically connected to a first driving circuit, and the second liquid crystal dimming film is electrically connected to a second driving circuit, wherein the first driving circuit and the second driving circuit are independently controlled. The dual-layer liquid crystal dimming film of this application supports single-layer display, dual-layer overlay display, or dynamic switching display.
[0020] Another aspect of this application provides a dimming device, including the double-layer liquid crystal dimming film as described above. Specifically, the dimming device of this application can be applied to automobile windows, automobile sunroofs, building doors and windows, building curtain wall liquids, or other related products known to those skilled in the art.
[0021] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows: The dual-layer liquid crystal dimming film of this application includes a first liquid crystal dimming film and a second liquid crystal dimming film, and the two liquid crystal dimming films are directly stacked and bonded together; the dual-layer liquid crystal dimming film of this application divides the two conductive layers that are arranged opposite to each other in the first liquid crystal dimming film and divides the two conductive layers that are arranged opposite to each other in the second liquid crystal dimming film. The two conductive layers that are arranged opposite to each other after division form the first and second patterns in space, respectively. The use of the two-layer superimposed dimming film further increases the number of dimming areas per unit area and supports the dynamic switching of various complex display patterns; the dual-layer liquid crystal dimming film of this application can be integrated into car windows / skylights, building curtain walls and other scenarios, and has both privacy dimming and decorative display functions. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of the double-layer liquid crystal dimming film in the embodiments of this application;
[0023] Figure 2 This is a schematic diagram of the structure of the single-layer liquid crystal dimming film in the embodiments of this application;
[0024] Figures 3(a)-3(g) This is a schematic diagram illustrating the display effect of squares, diagonal grids, and their superposition in the embodiments of this application;
[0025] Figures 4(a)-4(g) This is a schematic diagram illustrating two squares and their superimposed display effect in an embodiment of this application;
[0026] Figures 5(a)-5(c) This is a schematic diagram of the three-color display principle in an embodiment of this application.
[0027] Reference numerals: Double-layer liquid crystal dimming film-100, First liquid crystal dimming film-101, Second liquid crystal dimming film-102, Adhesive layer-103, First upper conductive layer-1011, First lower conductive layer-1012, First liquid crystal layer-1013, Second upper conductive layer-1021, Second lower conductive layer-1022, Second liquid crystal layer-1023. Detailed Implementation
[0028] The solutions in 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 in this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0029] As described in the background section, liquid crystal dimming films are being used more and more widely, and their ability to display complex patterns and flexibly switch between different patterns is becoming increasingly valued.
[0030] A single-layer liquid crystal dimming layer typically consists of a pair of transparent conductive layers and a liquid crystal layer between them. The orientation of the liquid crystal molecules in the liquid crystal layer changes accordingly with the electric field between the conductive layers, thereby altering the light transmittance of the liquid crystal dimming layer, thus achieving dimming. If the two conductive layers are further divided into several conductive regions, and different electric fields are applied to different conductive regions, then areas of varying brightness appear on the same single-layer liquid crystal dimming film, displaying the effect of a simple pattern.
[0031] In the automotive and construction industries, users have increasingly higher requirements for the functionality of dimming devices, such as the display effect of complex dynamic patterns. To meet this demand, the inventors of this application have creatively proposed a dual-layer liquid crystal dimming film 100, comprising a first liquid crystal dimming film 101 and a second liquid crystal dimming film 102 stacked together. The first liquid crystal dimming film 101 includes a first upper conductive layer 1011 and a first lower conductive layer 1012 disposed opposite to each other, and a first liquid crystal layer 1013 located between the first upper conductive layer 1011 and the first lower conductive layer 1012. The second liquid crystal dimming film 102 includes a second upper conductive layer 1021 and a second lower conductive layer 1022 disposed opposite to each other, and a first liquid crystal layer 1013 located between the second upper conductive layer 1021 and the first lower conductive layer 1022. A second liquid crystal layer 1023 is formed between the second upper conductive layer 1011 and the second lower conductive layer 1022; the first upper conductive layer 1011 and the first lower conductive layer 1012 are each divided into two or more conductive regions, and the divided first upper conductive layer 1011 and the first lower conductive layer 1012 are spatially superimposed to form a first pattern; the second upper conductive layer 1021 and the second lower conductive layer 1022 are each divided into two or more conductive regions, and the divided second upper conductive layer 1021 and the second lower conductive layer 1022 are spatially superimposed to form a second pattern; the first pattern and the second pattern do not overlap in space.
[0032] It should be noted that the non-overlapping of the first and second patterns in space refers to the two projected patterns of the first and second patterns relative to a certain plane. The two projected patterns may not touch or overlap at all, or they may partially overlap but not completely overlap.
[0033] The first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 of this application overlap each other in space. Light passing through the first liquid crystal dimming film 101 can be incident on the second liquid crystal dimming film 102, or light passing through the second liquid crystal dimming film 102 can also be incident on the first liquid crystal dimming film 101. Figure 1 This is a schematic diagram showing the structure of the first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 that overlap each other.
[0034] In addition to a conductive layer and a liquid crystal layer, the first liquid crystal dimming film 101 and / or the second liquid crystal dimming film 102 may also include conventional structures such as a substrate layer and an alignment layer (not shown in the figure). No specific structure is limited here. For example, the first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 may each include two alignment layers (not shown in the figure) disposed on both sides of the first liquid crystal layer 1013 and the second liquid crystal layer 1023.
[0035] For the single-layer first liquid crystal dimming film 101 or the second liquid crystal dimming film 102, the materials of its substrate layer, conductive layer, and alignment layer are conventionally chosen. The substrate layer is typically made of flexible transparent materials, such as polycarbonate (PC), polyethylene terephthalate (PET), triacetate cellulose (TAC), cyclic olefin copolymers, etc. The conductive layer includes conductive materials, such as indium tin oxide (ITO) coatings or nano-silver coatings. The alignment layer can be made of polyimide (PI) to orient the liquid crystal molecules within the liquid crystal layer.
[0036] For the first liquid crystal layer 1013 or the second liquid crystal layer 1023, based on the arrangement of liquid crystal molecules within the liquid crystal layer, various liquid crystal modes can be classified, including: twisted nematic (TN), super twisted nematic (STN), vertically aligned (VA), and electrically-controlled birefringence (ECB). When the electric field applied to the liquid crystal layer changes, the arrangement of liquid crystal molecules changes, causing a change in the retardation of the entire liquid crystal layer. Combined with upper and lower polarizers, the transmittance of the liquid crystal dimming film can be adjusted. Alternatively, without using polarizers, dichroic dyes can be doped into the liquid crystal. When the electric field of the upper and lower electrodes of the liquid crystal layer changes, the alignment direction of the liquid crystal molecules changes, leading to a synchronous change in the arrangement of the dye molecules in the liquid crystal. Therefore, the transmittance of the liquid crystal dimming layer can also be adjusted without using polarizers, such as in dye-doped TN, ECB, VA, and STN methods.
[0037] The first liquid crystal dimming film 101 and the second liquid crystal dimming film 102, which overlap in space, can be bonded together by an optically transparent adhesive layer 103. The adhesive layer 103 can be made of any of the following materials: ethylene-vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), optically clear adhesive (OCA), or self-curing adhesive (SCA). To balance the adhesive strength of the adhesive layer 103 with the effect of its own thickness, the thickness of the adhesive layer 103 can be set to 0.01 mm to 2 mm. Similarly, the fabricated double-layer liquid crystal dimming film 100 can be placed between opposing double-sided glass (or other transparent rigid / flexible materials) and bonded together by adhesive or other interlocking processes to create a dimming device suitable for applications such as automotive windows / skylights and building doors / curtain walls.
[0038] The dual-layer liquid crystal dimming film 100 of this application divides the two conductive layers that are arranged opposite each other in the first liquid crystal dimming film 101 and the two conductive layers that are arranged opposite each other in the second liquid crystal dimming film 102. The two conductive layers that are arranged opposite each other after division form the first and second patterns in space, respectively. By adopting the structure of directly superimposing the two dimming films, the number of dimming areas per unit area is increased, the resolution of dimming display is improved, and the dynamic switching of various complex display patterns can be supported with a relatively simple structure.
[0039] The first and second patterns formed by spatial superposition of the upper and lower conductive layers after partitioning can include at least one of horizontal and vertical stripes, diagonal stripes, and geometric shapes.
[0040] For example, the first upper conductive layer 1011 can be divided into several parallel horizontal stripes along the horizontal direction, and the first lower conductive layer 1012 can be divided into several parallel vertical stripes along the vertical direction. The first upper conductive layer 1011 and the first lower conductive layer 1012 form horizontal and vertical stripes in space, and the first pattern is a grid pattern formed by the horizontal and vertical stripes. The pattern of the second pattern (the grid size may not be the same) is a diamond-shaped grid pattern formed by rotating the first pattern 45° clockwise around the central axis of the first pattern. The specific formation process of the second pattern can be described as follows: the second upper conductive layer 1021 can be divided into several parallel strip-shaped areas along the 45° direction, and the second lower conductive layer 1022 can be divided into several parallel strip-shaped areas along the 135° direction. The second upper conductive layer 1021 and the second lower conductive layer 1022 form diagonal stripes in space, and the second pattern is a diamond-shaped grid pattern formed by the diagonal stripes. It should be noted that the vertical direction in the first upper / lower conductive layer or the second upper / lower conductive layer is only a naming distinction for the convenience of description, and does not restrict the vertical position of the conductive layer in the actual product.
[0041] Similarly, the first pattern is a grid pattern formed by horizontal and vertical stripes, and the second pattern is also a grid pattern formed by horizontal and vertical stripes. However, the second pattern can be shifted a certain distance in the horizontal and / or vertical directions relative to the first pattern, so that the two patterns are misaligned. One of the distances can be one-half or one-third of the grid length (or width) of the first pattern, so that the first and second patterns are misaligned and do not overlap.
[0042] The dual-layer liquid crystal dimming film 100 of this application can realize dynamic switching of various complex display patterns. In addition, it can also make the first liquid crystal layer 1013 and the second liquid crystal layer 1023 transmit light of different colors to achieve multi-color display.
[0043] To meet the demands of multi-color displays, both the first liquid crystal layer 1013 and the second liquid crystal layer 1023 can be configured as guest-host liquid crystal layers. A guest-host liquid crystal layer is a liquid crystal system composed of host liquid crystal molecules and guest dye molecules. The host liquid crystal molecules provide the basic structure of the liquid crystal phase, while the guest dye molecules exhibit unique optical properties through their interaction with the liquid crystal molecules. When an electric field is applied, the orientation of the host liquid crystal molecules changes, and the guest dye molecules rearrange accordingly, resulting in a change in the light transmission characteristics, thereby achieving optical modulation. For example, dye molecules of different colors can transmit different colors of light. The transmitted light from the first liquid crystal layer 1013 is the first color, and the transmitted light from the second liquid crystal layer 1023 is the second color. The first and second colors can be the same or different. When the first and second colors are different, the transmitted light of the first and second colors can combine to form a third color of transmitted light.
[0044] It is understood that the first liquid crystal dimming film 101 is electrically connected to a first driving circuit (not shown in the figure), and the second liquid crystal dimming film 102 is electrically connected to a second driving circuit (not shown in the figure). The first driving circuit and the second driving circuit are controlled independently. With the two liquid crystal dimming films controlled independently, the dual-layer liquid crystal dimming film 100 of this application supports single-layer display, dual-layer superimposed display, or dynamic switching display.
[0045] The specific embodiments of this application will be described below with reference to the accompanying drawings; however, this application is not limited to the embodiments disclosed below.
[0046] Example 1
[0047] like Figure 1 As shown, a dual-layer liquid crystal dimming film 100 includes a first liquid crystal dimming film 101 and a second liquid crystal dimming film 102 stacked together, and the first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 are bonded together by an adhesive layer 103. The areas of the first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 are usually set to be equal, and the adhesive layer 103 is made of OCA and has a thickness of 1 mm.
[0048] like Figure 2 As shown, the first liquid crystal dimming film 101 includes a first upper conductive layer 1011, a first lower conductive layer 1012 and a first liquid crystal layer 1013 stacked together.
[0049] Within a unit area, the first upper conductive layer 1011 is divided into several horizontal strips along the horizontal direction. These horizontal strips are parallel to each other and have equal widths, as shown in Figure 3(a). The first lower conductive layer 1012 is divided into several vertical strips along the vertical direction. These vertical strips are parallel to each other and have equal widths, as shown in Figure 3(b). The first pattern formed by the spatial superposition of the first upper conductive layer 1011 and the first lower conductive layer 1012 after division is a grid pattern formed by horizontal and vertical stripes, as shown in Figure 3(c).
[0050] Similarly, such as Figure 2 As shown, the second liquid crystal dimming film 102 includes a second upper conductive layer 1021, a second lower conductive layer 1022, and a second liquid crystal layer 1023 stacked together.
[0051] Similarly, within a unit area, the second upper conductive layer 1021 is divided into several diagonal strips along a 45° direction (the angle here can be a clockwise rotation along the horizontal direction), and the diagonal strips are parallel to each other, as shown in Figure 3(d); the second lower conductive layer 1022 is divided into several diagonal strips along a 135° direction (the angle here can be a clockwise rotation along the horizontal direction), and the diagonal strips are parallel to each other, as shown in Figure 3(e); the second pattern formed by the spatial superposition of the second upper conductive layer 1021 and the second lower conductive layer 1022 after division is a grid pattern formed by diagonal stripes, as shown in Figure 3(f); overall, the style of the second pattern (the grid size is not limited) is a diamond grid pattern formed by rotating the first pattern 45° clockwise along the central axis of the first pattern.
[0052] In this embodiment, the pattern after the first pattern and the second pattern are superimposed in space is shown in Figure 3(g). The dual-layer liquid crystal dimming film 100 of this embodiment adopts a structure of two dimming films directly superimposed, which increases the number of dimming areas per unit area, improves the resolution of dimming display, and can support the dynamic switching of a variety of complex display patterns with a relatively simple structure.
[0053] Example 2
[0054] This embodiment has the same basic structure as Embodiment 1, except that:
[0055] like Figure 2 As shown, the first liquid crystal dimming film 101 includes a first upper conductive layer 1011, a first lower conductive layer 1012 and a first liquid crystal layer 1013 stacked together.
[0056] Within a unit area, the first upper conductive layer 1011 is divided into several horizontal strips along the horizontal direction. These horizontal strips are parallel to each other and have equal widths, as shown in Figure 4(a). The first lower conductive layer 1012 is divided into several vertical strips along the vertical direction. These vertical strips are parallel to each other and have equal widths, as shown in Figure 4(b). The first pattern formed by the spatial superposition of the first upper conductive layer 1011 and the first lower conductive layer 1012 after division is a grid pattern formed by horizontal and vertical stripes, as shown in Figure 4(c).
[0057] Similarly, such as Figure 2 As shown, the second liquid crystal dimming film 102 includes a second upper conductive layer 1021, a second lower conductive layer 1022, and a second liquid crystal layer 1023 stacked together.
[0058] Similarly, within a unit area, the second upper conductive layer 1021 is divided into several horizontal stripes along the transverse direction, and these horizontal stripes are parallel to each other, as shown in Figure 4(d). Compared to Figure 4(a), the horizontal stripe pattern of the second upper conductive layer 1021 can be seen as having shifted downwards along the longitudinal direction by a certain distance, which is half the width of the horizontal stripes of the first upper conductive layer 1011. The horizontal stripe pattern of the second upper conductive layer 1021 can also be described as follows: when the second upper conductive layer 1021 is divided into strips, the width of the uppermost and lowermost horizontal stripes is set to half the width of the horizontal stripes of the first upper conductive layer 1011, and the width of the remaining horizontal stripes is set to be equal to the width of the horizontal stripes of the first upper conductive layer 1011.
[0059] The second lower conductive layer 1022 is divided into several vertical stripes along the vertical direction, and these stripes are parallel to each other, as shown in Figure 4(e). Compared with Figure 4(b), the vertical stripe pattern of the second lower conductive layer 1022 can be seen as shifting a certain distance to the right in the horizontal direction compared with the vertical stripe pattern of the first lower conductive layer 1012. This distance is half the width of the vertical stripe pattern of the first lower conductive layer 1012. The vertical stripe pattern of the second lower conductive layer 1022 can also be described as follows: when the second lower conductive layer 1022 is vertically divided into strips, the width of the leftmost and rightmost vertical stripes is set to half the width of the vertical stripe pattern of the first lower conductive layer 1012, and the width of the remaining vertical stripes is set to be equal to the width of the vertical stripe pattern of the first lower conductive layer 1012.
[0060] After the second upper conductive layer 1021 and the second lower conductive layer 1022 are spatially superimposed, the second pattern is a grid pattern formed by horizontal stripes, as shown in Figure 4(f). Overall, the second pattern is formed by the first pattern being moved a certain distance horizontally (here, the distance is half the width of the vertical strips divided by the first lower conductive layer 1012) and a certain distance vertically (here, the distance is half the width of the horizontal strips divided by the first upper conductive layer 1011). The first pattern and the second pattern are spatially misaligned.
[0061] In this embodiment, the pattern after the first pattern and the second pattern are superimposed in space is shown in Figure 4(g). The dual-layer liquid crystal dimming film 100 of this embodiment adopts a structure of two dimming films directly superimposed, which increases the number of dimming areas per unit area, improves the resolution of dimming display, and can support the dynamic switching of a variety of complex display patterns with a relatively simple structure.
[0062] Example 3
[0063] This embodiment has the same basic structure as Embodiment 1, except that:
[0064] like Figure 2 As shown, the first liquid crystal dimming film 101 includes a first upper conductive layer 1011, a first lower conductive layer 1012, and a first liquid crystal layer 1013 stacked together. The first liquid crystal layer 1013 is a guest-host type liquid crystal, which includes host liquid crystal molecules and guest dye molecules. The color of the light transmitted by the first liquid crystal layer 1013 is purple, and the pattern formed is shown in Figure 5(a).
[0065] Similar to Example 1, within a unit area, the first upper conductive layer 1011 is divided into several horizontal strips along the horizontal direction, and the horizontal strips are parallel to each other and have equal widths; the first lower conductive layer 1012 is divided into several vertical strips along the vertical direction, and the vertical strips are parallel to each other and have equal widths; the first pattern formed by the spatial superposition of the first upper conductive layer 1011 and the first lower conductive layer 1012 after division is a grid pattern formed by horizontal and vertical stripes, and when part of the grid transmits incident light and the color of the transmitted light is purple (dark gray in the figure), the pattern formed is as shown in Figure 5(a).
[0066] Similarly, such as Figure 2 As shown, the second liquid crystal dimming film 102 includes a second upper conductive layer 1021, a second lower conductive layer 1022, and a second liquid crystal layer 1023 stacked together. The second liquid crystal layer 1023 is a guest-host type liquid crystal, which includes host liquid crystal molecules and guest dye molecules. The color of the light transmitted by the second liquid crystal layer 1023 is green, and the pattern formed is shown in Figure 5(b).
[0067] Similar to Example 1, within a unit area, the second upper conductive layer 1021 is divided into several oblique strips along a 45° direction (the angle here can be a clockwise rotation along the horizontal direction), and the oblique strips are parallel to each other; the second lower conductive layer 1022 is divided into several oblique strips along a 135° direction (the angle here can be a clockwise rotation along the horizontal direction), and the oblique strips are parallel to each other; the second pattern formed by the spatial superposition of the second upper conductive layer 1021 and the second lower conductive layer 1022 after division is a grid pattern formed by oblique stripes; overall, the style of the second pattern (the grid size is not limited) is a diamond grid pattern formed by rotating the first pattern 45° clockwise along the central axis of the first pattern, and when part of the grid transmits incident light and the color of the transmitted light is green (light gray in the figure), the pattern formed is as shown in Figure 5(b).
[0068] In this embodiment, the pattern formed by the spatial superposition of the first and second patterns is shown in Figure 5(c). The dual-layer liquid crystal dimming film 100 of this embodiment adopts a structure of directly superimposing two dimming films, which increases the number of dimming areas per unit area, improves the resolution of the dimming display, and can support the dynamic switching of various complex display patterns with a relatively simple structure. At the same time, the first liquid crystal dimming film 101 can transmit a purple pattern alone, the second liquid crystal dimming film 102 can transmit a green pattern alone, or the dual-layer liquid crystal dimming film 100 can simultaneously display a partial purple pattern (dark gray in the figure), a partial green pattern (light gray in the figure), and a partial pattern of the color resulting from the combination of purple and green light (black in the figure).
[0069] It is understood that the first liquid crystal dimming film 101 and the second liquid crystal dimming film 102 are electrically connected to the first driving circuit and the second driving circuit, and are controlled independently. When the two liquid crystal dimming films are controlled independently, the dual-layer liquid crystal dimming film 100 of this application supports single-layer (pattern and / or color) display and dual-layer (pattern and / or color) superimposed display.
[0070] The dual-layer liquid crystal dimming film 100 of this application includes a first liquid crystal dimming film 101 and a second liquid crystal dimming film 102, which are directly stacked and bonded together. The dual-layer liquid crystal dimming film 100 of this application divides the two conductive layers that are arranged opposite each other in the first liquid crystal dimming film 101 and the two conductive layers that are arranged opposite each other in the second liquid crystal dimming film 102. The two conductive layers that are arranged opposite each other after division form a first pattern and a second pattern in space, respectively. The use of two-layer superposition further increases the number of dimming areas per unit area and supports dynamic switching of various complex display patterns. The dual-layer liquid crystal dimming film 100 of this application can be integrated into car windows / skylights, building curtain walls and other scenarios, and has both privacy dimming and decorative display functions.
[0071] Secondly, the dual-layer liquid crystal dimming film 100 of this application can also realize the transmission of first color light and second color light, as well as third color light after the first color light and second color light are superimposed, through the two layers of liquid crystal dimming film, thereby realizing multi-color display.
[0072] The above embodiments are only used to illustrate the specific implementation of this application. It should be noted that, for those skilled in the art, various modifications and changes can be made without departing from the concept of this application, and these modifications and changes should also fall within the protection scope of this application.
Claims
1. A dual layer liquid crystal light control film, characterized by, The first liquid crystal light-adjusting film and the second liquid crystal light-adjusting film are arranged in a stack. The first liquid crystal light-adjusting film comprises a first upper conductive layer and a first lower conductive layer arranged oppositely, and a first liquid crystal layer between the first upper conductive layer and the first lower conductive layer; the second liquid crystal light-adjusting film comprises a second upper conductive layer and a second lower conductive layer arranged oppositely, and a second liquid crystal layer between the second upper conductive layer and the second lower conductive layer. The first upper conductive layer and the first lower conductive layer are respectively divided into two or more conductive areas, and the divided first upper conductive layer and the first lower conductive layer are spatially superimposed to form a first pattern. The second upper conductive layer and the second lower conductive layer are respectively divided into two or more conductive areas, and the divided second upper conductive layer and the second lower conductive layer are spatially superimposed to form a second pattern. The first pattern and the second pattern do not overlap in space.
2. The dual layer liquid crystal switchable film according to claim 1, wherein, The first pattern and the second pattern comprise at least one of horizontal and vertical stripes, diagonal stripes, and geometric patterns.
3. The dual layer liquid crystal switchable film according to claim 2, wherein, The first pattern is horizontal and vertical stripes, and the horizontal and vertical stripes form a grid pattern; the second pattern is a prismatic grid pattern formed by rotating the horizontal and vertical grid pattern of the first pattern by 45 degrees clockwise along the central axis of the first pattern.
4. The dual layer liquid crystal switchable film according to claim 2, wherein, The first pattern is horizontal and vertical stripes, and the horizontal and vertical stripes form a grid pattern; the second pattern is formed by translating the first pattern by a distance along the horizontal direction and / or the vertical direction of the first pattern.
5. The dual layer liquid crystal switchable film according to claim 1, wherein, The first liquid crystal layer and the second liquid crystal layer are both guest-host type liquid crystal layers.
6. The dual layer liquid crystal switchable film according to claim 5, wherein, The first liquid crystal layer transmits light of a first color, and the second liquid crystal layer transmits light of a second color.
7. The dual layer liquid crystal switchable film according to any one of claims 1-6, wherein, The first liquid crystal light-adjusting film and the second liquid crystal light-adjusting film are bonded by an optically transparent adhesive layer.
8. The dual layer liquid crystal switchable film according to claim 7, wherein, The adhesive layer is any one of ethylene-vinyl acetate copolymer, polyvinyl butyral, optically transparent glue, or self-curing adhesive.
9. The dual layer liquid crystal switchable film according to claim 7, wherein, The thickness of the adhesive layer is 0.01mm-2mm.
10. The dual layer liquid crystal switchable film according to any one of claims 1-6, wherein, The first liquid crystal light-adjusting film is electrically connected with a first driving circuit, and the second liquid crystal light-adjusting film is electrically connected with a second driving circuit, and the first driving circuit and the second driving circuit are independently controlled respectively.
11. A dimming device, characterized by The double-layer liquid crystal light-adjusting film comprises any one of the double-layer liquid crystal light-adjusting films according to claims 1-10.