Display device and article

Abstract

The application relates to a display device and an article. The display device comprises a transparent body and a projection light source. The transparent body comprises a light-transmitting carrier, a first display module, a second display module and a polarizing layer connected to the light-transmitting carrier. The projection light source is arranged on one side of the transparent body and is used for projecting at least one of first polarized light and second polarized light which are arranged perpendicularly to each other to the transparent body. The first polarized light is perpendicular to the light transmission axis of the polarizing layer, and the second polarized light is parallel to the light transmission axis of the polarizing layer. When the first polarized light is incident on the polarizing layer, the first polarized light is absorbed when passing through the polarizing layer due to the perpendicularity between the first polarized light and the light transmission axis of the polarizing layer, thereby presenting a dark state effect, that is, the first polarized light cannot be observed and recognized by outdoor personnel, thereby improving the privacy performance. When the second polarized light is incident, the first display module and the second display module can present a light-emitting effect, that is, a double-sided display effect can be realized, and the first display module and the second display module can be observed and recognized by indoor and outdoor personnel at the same time.

Description

Technical Field

[0001] This application relates to the field of display device technology, and in particular to a display device and article. Background Technology

[0002] Display devices, including but not limited to glass with display functions, can be applied in exhibition halls, building windows and curtain walls, automobiles, ships, locomotives, human-computer interaction, and other fields, with broad application prospects. Especially in the automotive field, window displays serve as an important human-computer interaction interface. For example, information such as speed, fuel consumption, navigation, and external smart devices can be displayed in real time on the windshield, and advertisements can also be displayed on the side windows.

[0003] In related technologies, display glass is mainly used to display various scenes inside vehicles. Light-blocking components such as gray glass and gray film are used on the display glass to reduce transmittance and prevent the content displayed inside the vehicle from being observed by people outside. However, in nighttime or low-light environments, the content displayed inside the vehicle can still be observed by people outside, resulting in poor privacy and potential information leakage security risks. Furthermore, the display function of display glass is generally only suitable for in-vehicle or out-of-vehicle displays, offering limited functionality. Summary of the Invention

[0004] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide a display device and article that can achieve double-sided display, enhance functionality, and improve security.

[0005] A display device, the display device comprising:

[0006] A transparent body, comprising a light-transmitting carrier and a first display module, a second display module, and a polarizing layer connected to the light-transmitting carrier; and

[0007] A projection light source is located on one side of the transparent body and is used to incident at least one of a first polarized light and a second polarized light that are perpendicularly arranged to each other onto the transparent body; the polarization direction of the first polarized light is perpendicular to the light transmission axis of the polarizing layer, and / or the polarization direction of the second polarized light is on the same plane as the light transmission axis of the polarizing layer and is parallel to each other or at an angle to each other;

[0008] Wherein, the distance between the first display module and the projection light source is less than the distance between the second display module and the projection light source, and the distance between the first display module and the projection light source is less than the distance between the polarizing layer and the projection light source.

[0009] In one embodiment, the light-transmitting carrier includes a first light-transmitting plate, which has a first surface facing the projection light source and a second surface facing away from the projection light source; the first display module is connected to the second surface, the second display module is connected to the side of the first display module facing away from the second surface, and the polarizing layer is connected between the first display module and the second display module or to the side of the second display module facing away from the second surface.

[0010] In one embodiment, the ratio of the display brightness of the first display module to the reflective brightness of the first light-transmitting plate is greater than or equal to 4.5.

[0011] In one embodiment, the light-transmitting carrier further includes a second light-transmitting plate, which is connected to the first light-transmitting plate, and the first display module is connected between the first light-transmitting plate and the second light-transmitting plate.

[0012] In one embodiment, the transparent body further includes an adhesive layer connecting the light-transmitting carrier, the first display module, the second display module, and any two adjacent stacks of the polarizing layer.

[0013] In one embodiment, the image brightness after the first polarized light is transmitted through the polarizing layer is less than or equal to 5 nits.

[0014] In one embodiment, the first display module is a front-projection transparent display film.

[0015] In one embodiment, the second display module is a particle scattering layer.

[0016] In one embodiment, the particle scattering layer is a PDLC, a holographic film, an ink-printed layer, or any combination thereof.

[0017] In one embodiment, the particle size of the particle scattering layer is ≤5 μm; and / or, the haze of the particle scattering layer is ≥10%; and / or, the transmittance of the particle scattering layer is ≥50%.

[0018] An article comprising the aforementioned display device, the article comprising any one or combination of display cases, building windows and curtain walls, automobiles, ships, locomotives, human-computer interaction devices, electrical appliances, and information kiosks.

[0019] In the aforementioned display device and article, when the projection light source emits first polarized light towards the transparent body, the first polarized light first enters the nearest first display module, causing the first display module to emit light, which can be observed and identified by people indoors. Then, when the first polarized light enters the polarizing layer, since the polarization direction of the first polarized light is perpendicular to the light transmission axis of the polarizing layer, it is absorbed by the polarizing layer, resulting in a dark state, which means it cannot be observed and identified by people outdoors, thus improving privacy. Furthermore, when the projection light source emits second polarized light towards the transparent body, since the polarization direction of the second polarized light is on the same plane as the light transmission axis of the polarizing layer and is parallel to or at an angle to each other, not only does the first display module emit light, but the second display module also emits light, thus achieving a dual-sided display effect, which can be observed and identified by people both indoors and outdoors. In addition, by switching the polarization state of the projection light source, the switching between indoor display and dual-sided display can be achieved in a timely manner. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of a display device according to an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view of a display device according to another embodiment of this application.

[0022] Figure 3 This is a cross-sectional view of a display device according to another embodiment of this application.

[0023] Figure 4 This is a cross-sectional view of a display device according to another embodiment of this application.

[0024] Figure 5 for Figure 4 The light path diagram of the projection light source in the structure shown, incident on the transparent body with first polarized light.

[0025] Figure 6 for Figure 4 The light path diagram of the projection light source in the structure shown, incident on the transparent body with second polarized light.

[0026] Figure 7 for Figure 2 The light path diagram of the projection light source in the structure shown, incident on the transparent body with first polarized light.

[0027] 10. Transparent body; 11. Light-transmitting carrier; 111. First light-transmitting plate; 1111. First surface; 1112. Second surface; 112. Second light-transmitting plate; 1121. Third surface; 1122. Fourth surface; 12. First display module; 13. Second display module; 14. Polarizing layer; 20. Projection light source. Detailed Implementation

[0028] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0029] This application provides a display device that can achieve dual-sided display, enhance functionality, and improve privacy. It can be applied to display cases, building windows and curtain walls, automobiles, ships, locomotives, human-computer interaction and other fields. In practical scenarios, it can either allow the projected content of the projection light source to be displayed indoors alone without being observed by people outdoors, or allow the projected content of the projection light source to be observed by people indoors and people outdoors respectively.

[0030] See Figure 1 , Figure 1 A cross-sectional structural diagram of a display device according to an embodiment of this application is shown. An embodiment of this application provides a display device comprising: a transparent body 10 and a projection light source 20. The transparent body 10 includes a light-transmitting carrier 11 and a first display module 12, a second display module 13, and a polarizing layer 14 connected to the light-transmitting carrier 11. The projection light source 20 is located on one side of the transparent body 10 and is used to incident at least one of mutually perpendicular first polarized light and second polarized light onto the transparent body 10.

[0031] Optionally, the projection light source 20 may be specifically disposed on the body sheet metal, for example. The projection light source 20 may include, but is not limited to, a light-emitting panel, a thin-film transistor display (TFT), an organic light-emitting diode display (OLED), a liquid crystal on silicon (LCOS), a digital light processing display (DLP), a sub-millimeter light-emitting diode display (Mini LED), or a micro light-emitting diode display (MicroLED). The projection light source 20 can emit both first polarized light and second polarized light, and can switch between the first and second polarized light. It can also simultaneously cause the first and second polarized light to be incident on two regions of the transparent body 10 in a parallel manner.

[0032] Furthermore, the polarization direction of the first polarized light is perpendicular to the transmission axis of the polarizing layer 14, and / or the polarization direction of the second polarized light is on the same plane as the transmission axis of the polarizing layer 14 and is parallel to or at an angle to it. Optionally, when the first polarized light is set as P-polarized light, the second polarized light is correspondingly set as S-polarized light; when the first polarized light is set as S-polarized light, the second polarized light is correspondingly set as P-polarized light.

[0033] The distance between the first display module 12 and the projection light source 20 is less than the distance between the second display module 13 and the projection light source 20, and the distance between the first display module 12 and the projection light source 20 is also less than the distance between the polarizing layer 14 and the projection light source 20.

[0034] In this embodiment, the environments on opposite sides of the transparent body 10 are respectively designated as indoor and outdoor, and the projection light source 20 can be located either indoors or outdoors. Specifically, this embodiment uses an example where the projection light source 20 is located indoors, such as in a driver's cab, and is specifically mounted on the vehicle's sheet metal. The side of the transparent body 10 facing away from the projection light source 20 is the outdoor area. Thus, when the first polarized light from the projection light source 20 acts on the first display module 12, people indoors can observe the image displayed by the first display module 12. Furthermore, when the second polarized light from the projection light source 20 is incident on the transparent body 10, since it is not absorbed by the polarizing layer 14, not only can people indoors observe the image displayed by the first display module 12, but people outdoors can also simultaneously observe the image displayed by the second display module 13.

[0035] In the aforementioned display device, when the projection light source 20 emits first polarized light towards the transparent body 10, the first polarized light first enters the nearest first display module 12, causing the first display module 12 to emit light, which can be observed and identified by people indoors. Then, when the first polarized light enters the polarizing layer 14, since the polarization direction of the first polarized light is perpendicular to the light transmission axis of the polarizing layer 14, it is absorbed by the polarizing layer 14, resulting in a dark state, which means it cannot be observed and identified by people outdoors, thus improving privacy. Furthermore, when the projection light source 20 emits second polarized light towards the transparent body 10, since the polarization direction of the second polarized light is on the same plane as the light transmission axis of the polarizing layer 14 and is parallel to or at an angle to each other, not only does the first display module 12 emit light, but the second display module 13 also emits light, thus achieving a dual-sided display effect, which can be observed and identified by people both indoors and outdoors. In addition, by switching the polarization state of the projection light source 20, the switching between indoor display and dual-sided display can be realized in a timely manner.

[0036] It should be noted that the first display module 12 and the second display module 13 are each used for displaying patterns or playing videos, etc., to complete various functions such as welcoming guests, creating atmosphere, watching movies and working. The specific functions can be flexibly adjusted and set according to actual needs.

[0037] Please see Figures 1 to 4 , Figures 2 to 4Cross-sectional structural diagrams of display devices according to three other embodiments of this application are shown. In one embodiment, the light-transmitting carrier 11 includes a first light-transmitting plate 111. The first light-transmitting plate 111 serves a supporting function, becoming a carrier for the first display module 12, the second display module 13, and the polarizing layer 14. During installation, it can be as follows: Figures 1 to 4 The structure shown faces the projection light source 20, but can be flexibly adjusted and configured into various other arrangements according to actual needs. For example, it can be arranged on the side of the first display module 12 facing away from the projection light source 20, on the side of the second display module 13 facing away from the projection light source 20, or on the side of the polarizing layer 14 facing away from the projection light source 20. In this embodiment, the first light-transmitting plate 111 facing the projection light source 20 will be mainly used as an example for detailed description; other arrangements will not be elaborated. The first light-transmitting plate 111 has a first surface 1111 facing the projection light source 20 and a second surface 1112 facing away from the projection light source 20. The first display module 12 is connected to the second surface 1112, and the second display module 13 is connected to the side of the first display module 12 facing away from the second surface 1112. The polarizing layer 14 is connected between the first display module 12 and the second display module 13 (e.g., ...). Figure 2 or Figure 4 (as shown) or connected to the side of the second display module 13 opposite to the second surface 1112 (as shown) Figure 1 or Figure 3 (As shown).

[0038] Please see Figures 1 to 4 In any one embodiment, the ratio of the display brightness of the first display module 12 to the reflective brightness of the first light-transmitting plate 111 is greater than or equal to 4.5, specifically, for example, 10, 16, 30, 50, or 100. This avoids ghosting, ensuring that the image observed by people indoors primarily originates from the image displayed by the first display module 12.

[0039] Specifically, the first polarized light is, for example, P-polarized light. When P-polarized light is input, people in the room can observe the displayed image of the first display module 12 and reduce the reflection of the glass surface of the first light-transmitting plate 111, thereby reducing the ghosting phenomenon in the indoor display.

[0040] As some alternatives, the reflectivity of the first light-transmitting plate 111 can be set to less than or equal to 10%, specifically 8%, 5%, 3%, 2% or 1%, etc. In this way, the reflectivity of the first light-transmitting plate 111 is low, which reduces ghosting when displayed indoors.

[0041] Please see Figures 2 to 4In one embodiment, the light-transmitting carrier 11 further includes a second light-transmitting plate 112. The second light-transmitting plate 112 is connected to the first light-transmitting plate 111, and the first display module 12 is connected between the first light-transmitting plate 111 and the second light-transmitting plate 112. Thus, by adding the second light-transmitting plate 112, the structural strength of the transparent body 10 can be increased by the light-transmitting carrier 11.

[0042] In one embodiment, the transparent body 10 further includes an adhesive layer (not shown in the figure) connecting any two adjacent stacks of the light-transmitting carrier 11, the first display module 12, the second display module 13 and the polarizing layer 14.

[0043] Optionally, the adhesive layer may include, but is not limited to, transparent adhesive materials. In some embodiments, the adhesive layer may be selected from polyvinyl butyral (PVB), ethylene vinyl acetate (EVA), optically transparent adhesive (OCA), liquid optically transparent adhesive (LOCA), optically transparent resin (OCR), and combinations thereof, depending on actual needs. Furthermore, the adhesive layer may also be selected from polycarbonate (PC), sound-insulating PVB, light-shielding PVB, heat-controlling PVB, thermoplastic polyurethane (TPU), ionomers, thermoplastic materials, polybutylene terephthalate (PBT), polyethylene vinyl acetate (PET), polyethylene naphthalate (PEN), polyvinyl chloride (PVC), polyvinyl fluoride (PVf), polyacrylate (PA), polymethyl methacrylate (PMMA), polyurethane (PUR), and combinations thereof, depending on actual needs.

[0044] The adhesive layer can be made of an adhesive material with high transmittance (≥85%) and low haze (≤1%, such as 0.6%, 0.4%, 0.2%), or an adhesive material with low transmittance (≤50%, such as 40%, 30%, 20%, 10%, 8%, 5%, 2%, or 1%). Furthermore, the polarization state of the light from the projection light source 20 does not change when it passes through the adhesive layer.

[0045] In some embodiments, the first light-transmitting plate 111 and the second light-transmitting plate 112 can be flexibly adjusted and set into various structural forms according to actual needs, including but not limited to single-pane glass, laminated structure or insulated glass, and can be flexibly set according to actual needs.

[0046] In one embodiment, the image brightness of the first polarized light after passing through the polarizing layer 14 is less than or equal to 5 nits, such as 2 nits, 1 nit, 0.8 nits, 0.5 nits, etc. Thus, the first polarized light is perpendicular to the transmission axis of the polarizing layer 14, and is essentially absorbed upon passing through the polarizing layer 14, presenting a dark effect, meaning it cannot be observed or identified by people outdoors, thus improving privacy performance.

[0047] In some embodiments, the external dimensions of the first display module 12 and the second display module 13 are smaller than or equal to the external dimensions of the first light-transmitting plate 111. In other words, the surface area of ​​the first light-transmitting plate 111 completely covers the first display module 12 or the second display module 13.

[0048] In one embodiment, the first display module 12 is specifically a front-projection transparent display film, which can be a diffuse reflection film, or a transparent film with controllable reflection direction, or a light-gathering or light-diffusing film, such as a photonic transparent display film, a holographic film (HOE), a wave-aligned liquid crystal film, etc.; the preparation method can be imprinting, transfer printing, holographic exposure, or coating process, etc.

[0049] In one embodiment, the second display module 13 is a particle scattering layer. Thus, when the projection light source 20 switches to second polarized light incident on the transparent body 10, the particle scattering layer can scatter the second polarized light when it is incident on the second display module 13, thereby improving the viewing angle of the outdoor display.

[0050] In one embodiment, the particle scattering layer includes, but is not limited to, PDLC, holographic film, or ink printing layer.

[0051] In one embodiment, the particle size of the particle scattering layer is ≤5um, for example, 10um, 20um, 50um or 100um, etc.; the haze of the particle scattering layer is ≥10%, for example, 20%, 50% or 95%, etc.; and the light transmittance of the particle scattering layer is ≥50%, for example, 60%, 70%, 80% or 90%, etc.

[0052] In one embodiment, the polarizing layer 14 is a transparent substrate with polarization selective transmission. This transparent substrate can be flexible or rigid, allowing polarized light with an electric field direction parallel to the transmission axis to pass through, while polarized light perpendicular to this direction is absorbed. Optionally, the polarizing layer 14 is generally a dichroic thin film layer. The core film material in the polarizing layer 14 that plays a polarizing role is a PVA film. PVA (polyvinyl alcohol) film is mainly composed of light atoms such as carbon, hydrogen, and oxygen, and has characteristics such as high light transmittance and high ductility. After the PVA film is dyed in a dyeing bath, its surface will be uniformly enriched with a layer of dichroic molecules, metal salts such as gold, silver, and iron, dye molecules, or polyethylene molecules. When the PVA is stretched by external force, the PVA molecular chains are distributed along the direction of the external force. At this time, the dichroic molecules are also orderly distributed to form a polarizing layer 14 with uniform dichroic absorption properties, whose transmission axis is perpendicular to the stretching direction.

[0053] In one specific embodiment, please refer to Figures 4 to 6 , Figure 5 It shows Figure 4The light path diagram of the projection light source 20 in the structure shown, which incident the first polarized light onto the transparent body 10. Figure 6 It shows Figure 4 The light path diagram of the projection light source 20 in the structure shown, which is incident on the transparent body 10 with second polarized light. Figure 4 In the structure of the display device shown in one embodiment, a first light-transmitting plate 111, a first display module 12, a polarizing layer 14, a second display module 13, and the second light-transmitting plate 112 are stacked sequentially. The second light-transmitting plate 112 has a third surface 1121 and a fourth surface 1122, and the third surface 1121 is connected to the second display module 13. Please refer to [link / reference]. Figure 5 The light from the projection light source 20, using first polarized light G1, is incident on the first surface 1111 of the first light-transmitting plate 111, resulting in reflected light M1. Figure 5 In the diagram, the two arrows f1 on the first polarized light G1 indicate the direction of the electric field vibration of the light, with the dashed line O representing the normal. The polarization of light generally refers to the phenomenon where the spatial distribution of the electric vector vibration of the light wave loses symmetry with respect to the direction of light propagation. The first polarized light G1 at the incident angle θ... i Brewster angle θ iB (Brewster's angle), θ iB = tan -1 (n g / n i ), where n g Let n be the refractive index of the first light-transmitting plate 111. i Let be the refractive index of air (generally approximated as 1). Theoretically, the reflectivity is 0%, which greatly suppresses the reflected light M1 from the first surface 1111 and the air surface, reducing image ghosting caused by this surface. The first polarized light G1 passes through the first light-transmitting plate 111 to obtain the transmitted light T1, with a transmission angle of θ. t Its polarization state remains unchanged. Then, after reflection and scattering by the first display module 12, the image is reflected by the first display module 12 to form a display image that is observed by people in the room. The ratio of the brightness of the display image of the first display module 12 to the brightness of the image reflected by the first surface is ≥4.5.

[0054] Furthermore, the polarization state of the transmitted light T2 through the first display module 12 remains unchanged, and the transmission axis of the polarizing layer 14, for example, is perpendicular to the paper surface, i.e. Figure 5 The direction marked by “ⓧ” is perpendicular to the paper and inwards, and is perpendicular to the direction of arrow f1. This makes the polarization direction of the transmitted light T2 orthogonal to the transmission axis of the polarizing layer 14. In this way, the transmitted light T2 is basically absorbed when it passes through the polarizing layer 14, and the brightness of the transmitted image is ≤5 nits, for example, 2 nits or 1 nit.

[0055] Please refer to the following: Figure 6 The light from the projection light source 20, for example, using second polarized light G2, is incident on the first surface 1111 of the first light-transmitting plate 111. Figure 6 The direction of the "ⓧ" mark on the second polarized light G2 indicates the direction of the electric field vibration of the light, perpendicular to the paper and inward, that is, parallel to the direction of the transmission axis of the polarizing layer 14. The reflected light M2 is generated when the second polarized light G2 is incident on the first surface 1111 of the first light-transmitting plate 111. The polarization state of the reflected light M2 remains unchanged. After passing through the first light-transmitting plate 111, it becomes the transmitted light T3. After passing through the first display module 12, it becomes the transmitted light T4. The polarization states of the transmitted light T3 and the transmitted light T4 remain unchanged. When passing through the polarizing layer 14, the polarization direction of the transmitted light T4 is consistent with the transmission axis direction of the polarizing layer 14, so it can pass through the polarizing layer 14 smoothly without being greatly consumed by the polarizing layer 14, so that people outside can observe the image generated when it is transmitted to the second display module 13. Specifically, when the transmitted light T4 passes through the second display module 13, it is expanded, and then passes through the second light-transmitting plate 112 for people outside the vehicle to view.

[0056] Of course, as some optional solutions, the polarization direction of the second polarized light G2 is not limited to being on the same plane and parallel to each other as the transmission axis of the polarizing layer 14 in the above embodiment. Instead, it can be set to be on the same plane and at an angle to the transmission axis of the polarizing layer 14, for example, at an acute angle or at an obtuse angle. In this way, one component of the polarization direction of the second polarized light G2 is parallel to the transmission axis of the polarizing layer 14, and the other component is perpendicular to the transmission axis of the polarizing layer 14. One component of the polarization direction of the second polarized light G2 can be transmitted, so that outdoor personnel can observe the image generated when it is transmitted to the second display module 13, thereby realizing double-sided display.

[0057] Please refer to details. Figure 2 and Figure 7 , Figure 7 It shows Figure 2 The light path diagram of the projection light source 20 in the structure shown, incident with first polarized light onto the transparent body 10. Compared to Figure 5 and Figure 6 Regarding the structure shown, Figure 7 The direction of the transmission axis of the polarizing layer 14 in the structure shown is different from that of the polarizing layer 14 in the structure shown. Figure 5 and Figure 6 The direction of the transmission axis of the polarizing layer 14 in the middle. Figure 7 The direction of the transmission axis of the polarizing layer 14 is as shown by arrow f2, parallel to the paper surface, and has an angle with the polarization direction of the first polarized light G1, i.e., the direction of arrow f1.

[0058] Specifically, the light from the projection light source 20 is first polarized light G1 incident on the first surface 1111 of the first light-transmitting plate 111, resulting in reflected light M1. After passing through the first light-transmitting plate 111, the first polarized light G1 becomes transmitted light T5, and the transmission angle of the transmitted light T5 is θ. t Its polarization state remains unchanged. Then, after reflection and scattering by the first display module 12, the image is reflected by the first display module 12 to form a display image that is observed by people in the room. The ratio of the brightness of the display image of the first display module 12 to the brightness of the image reflected by the first surface is ≥4.5.

[0059] Furthermore, the polarization state of the transmitted light T5 through the first display module 12 remains unchanged, and because the direction of arrow f1 has a component f parallel to the direction of arrow f2, 11 The component f perpendicular to the direction of arrow f2 12 Thus, when passing through polarization layer 14, the polarization component f of the transmitted light T6... 11 The light beam T6 is aligned with the transmission axis f2 of the polarizing layer 14, allowing it to pass smoothly through the polarizing layer 14 without being significantly consumed by it. This enables outdoor personnel to observe the image generated when the light beam is transmitted to the second display module 13. Specifically, when the transmitted light beam T6 passes through the second display module 13, it undergoes beam expansion before passing through the second light-transmitting plate 112 for viewing by personnel outside the vehicle.

[0060] In some embodiments, the transmission axis direction of the polarizing layer 14 is not limited to the direction perpendicular to the paper surface in the above embodiments, but can also be as follows: Figure 2 The image is located within the plane of the paper. Similarly, when the polarization direction of the first polarized light is perpendicular to the plane of the paper, the polarization direction of the first polarized light is correspondingly perpendicular to the transmission axis of the polarizing layer 14, and the image is not visible outside the vehicle. When the polarization direction of the second polarized light is also within the plane of the paper, in other words, the polarization direction of the second polarized light is on the same plane as the polarizing layer 14, the second polarized light can be decomposed into two perpendicular components. If one of the components is consistent with the transmission axis of the polarizing layer 14, then the image is visible both inside and outside the vehicle.

[0061] In this design, the first polarized light and the second polarized light of the projection light source 20 can switch polarization states. Specifically, as an example, the projection light source 20 is either S-polarized light or P-polarized light. By adding a rotatable and adjustable phase retarder to the output end of the projection light source 20, the deflected light from the projection light source 20, when passing through the phase retarder, delays the phase of the polarized light, thus enabling the adjustment of S-polarized light to P-polarized light, or vice versa.

[0062] Phase retarders include, but are not limited to, waveplates, such as quarter-wave plates and half-wave plates. Because polarized light has different refractive indices, they may be polarizing films made of oriented thin film stretching or birefringent materials, or they may be made of quartz crystals. By causing a phase shift between the two mutually orthogonal polarization components passing through the waveplate, the polarization state of the light beam can be adjusted.

[0063] In another embodiment, the light source of the projection optical engine is unpolarized or has a low degree of polarization (e.g., polarization degree <0.5), and by adding a rotatable and position-adjustable phase retarder at the emission end of the projection light source 20, such as a polarizer, the light source of the projection optical engine can be switched between S-polarization and P-polarization states by rotating the phase retarder.

[0064] Please see Figure 1 In one embodiment, an article of manufacture includes the display device of any of the above embodiments, and the article of manufacture includes any one or combination of display cases, building windows and curtain walls, automobiles, ships, locomotives, human-computer interaction, electrical appliances, and information kiosks.

[0065] In the aforementioned product, when the projection light source 20 emits first polarized light towards the transparent body 10, the first polarized light first enters the nearest first display module 12, causing the first display module 12 to emit light, which can be observed and identified by people indoors. Then, when the first polarized light enters the polarizing layer 14, since the first polarized light is perpendicular to the transmission axis of the polarizing layer 14, it is absorbed by the polarizing layer 14, resulting in a dark state, which means it cannot be observed and identified by people outdoors, thus improving privacy. Furthermore, when the projection light source 20 emits second polarized light towards the transparent body 10, since the second polarized light is parallel to the transmission axis of the polarizing layer 14, not only does the first display module 12 emit light, but the second display module 13 also emits light, thus achieving a dual-sided display effect, which can be observed and identified by people both indoors and outdoors. In addition, by switching the polarization state of the projection light source 20, the switching between indoor display and dual-sided display can be achieved in a timely manner.

[0066] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A display device, characterized in that, The display device includes: A transparent body, comprising a light-transmitting carrier and a first display module, a second display module, and a polarizing layer connected to the light-transmitting carrier; and A projection light source is located on one side of the transparent body and is used to incident at least one of a first polarized light and a second polarized light that are perpendicularly arranged to each other onto the transparent body; the polarization direction of the first polarized light is perpendicular to the light transmission axis of the polarizing layer, and / or the polarization direction of the second polarized light is on the same plane as the light transmission axis of the polarizing layer and is parallel to each other or at an angle to each other; Wherein, the distance between the first display module and the projection light source is less than the distance between the second display module and the projection light source, and the distance between the first display module and the projection light source is less than the distance between the polarizing layer and the projection light source; the first display module is a front-projection transparent display film, and the second display module is a particle scattering layer; the light-transmitting carrier includes a first light-transmitting plate, which has a first surface facing the projection light source and a second surface facing away from the projection light source; the first display module is connected to the second surface, the second display module is connected to the side of the first display module facing away from the second surface, and the polarizing layer is connected between the first display module and the second display module or to the side of the second display module facing away from the second surface.

2. The display device according to claim 1, characterized in that, The ratio of the display brightness of the first display module to the reflective brightness of the first light-transmitting plate is greater than or equal to 4.

5.

3. The display device according to claim 1, characterized in that, The light-transmitting carrier further includes a second light-transmitting plate, which is connected to the first light-transmitting plate, and the first display module is connected between the first light-transmitting plate and the second light-transmitting plate.

4. The display device according to claim 1, characterized in that, The transparent body also includes an adhesive layer connecting the light-transmitting carrier, the first display module, the second display module and any two adjacent stacks of the polarizing layer.

5. The display device according to claim 1, characterized in that, The image brightness after the first polarized light passes through the polarizing layer is less than or equal to 5 nits.

6. The display device according to claim 1, characterized in that, The particle scattering layer is a PDLC, a holographic film, an ink printing layer, or any combination thereof.

7. The display device according to any one of claims 1 to 6, characterized in that, The particle size of the particle scattering layer is ≤5µm.

8. The display device according to any one of claims 1 to 6, characterized in that, The haze of the particle scattering layer is ≥10%.

9. The display device according to any one of claims 1 to 6, characterized in that, The transmittance of the particle scattering layer is ≥50%.

10. An article characterized in that, The article includes the display device as described in any one of claims 1 to 9, and the article includes any one or a combination of display cases, building windows and curtain walls, automobiles, ships, locomotives, human-computer interaction, electrical appliances, and information kiosks.

Images