Dual-sided display device

Abstract

A dual-sided display device includes a transparent self-emissive display panel, a switching panel, and a projection device. The transparent self-emissive display panel has a light-emitting side and an opposite back side. The switching panel is disposed on the back side of the transparent self-emissive display panel. The switching panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode. The first electrode and the second electrode are configured to control liquid crystal molecules in the liquid crystal layer such that the switching panel includes a scattering state and a transparent state. The projection device is configured to project toward the light-emitting side of the transparent self-emissive display panel.

Description

Technical Field

[0001] This invention relates to a double-sided display device. Background Technology

[0002] Duplex displays are an innovative screen technology with a wide range of applications. For example, they have significant applications in advertising. They can be used to create billboards and signs, allowing advertising content to be displayed in different directions. This improves the visibility and effectiveness of the advertisement, attracting more attention. In shop windows, retailers can use duplex displays to showcase product information, promotions, and brand information, thereby attracting the interest of passersby.

[0003] In addition, exhibition spaces and museums frequently use double-sided display devices. These devices can be used to showcase different information about the exhibits and their historical context, allowing visitors to gain a more comprehensive understanding of the exhibits. They offer interactivity and appeal, enhancing audience engagement.

[0004] In general, dual-sided display devices play an important role in various fields. They provide multifunctional information delivery, attract attention, and enhance entertainment experiences. Therefore, many manufacturers are currently focusing on developing high-performance dual-sided display devices. Summary of the Invention

[0005] This invention provides a multifunctional double-sided display device that can operate in various different modes to meet diverse usage needs.

[0006] At least one embodiment of the present invention provides a double-sided display device, including a transparent self-emissive display panel, a switching panel, and a projection device. The transparent self-emissive display panel has a light-emitting side and a back side opposite to the light-emitting side. The switching panel is disposed on the back side of the transparent self-emissive display panel. The switching panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode. The first electrode and the second electrode are configured to control liquid crystal molecules in the liquid crystal layer, such that the switching panel includes a scattering state and a transparent state. The projection device is configured to project onto the light-emitting side of the transparent self-emissive display panel. The dual-sided display device includes the following usage modes: When the transparent self-emissive display panel and projection device are turned off, and the switching panel is switched to a transparent state, the dual-sided display device is in transparent mode; when the transparent self-emissive display panel and projection device are turned off, and the switching panel is switched to a scattering state, the dual-sided display device is in occlusion mode, wherein the transmittance of the dual-sided display device in occlusion mode is lower than that in transparent mode; when the transparent self-emissive display panel is turned on, the projection device is turned off, and the switching panel is switched to a transparent state, the dual-sided display device is in Augmented Reality (AR) mode; when the transparent self-emissive display panel is turned on, the projection device is turned off, and the switching panel is switched to a scattering state, the dual-sided display device is in single-sided display mode; when the transparent self-emissive display panel and projection device are turned on, and the switching panel is switched to a scattering state, the dual-sided display device is in dual-sided display mode.

[0007] At least one embodiment of the present invention provides a double-sided display device. The double-sided display device includes a transparent self-emissive display panel, a switching panel, and a projection device. The transparent self-emissive display panel has a light-emitting side and a back side opposite to the light-emitting side. The switching panel is disposed on the back side of the transparent self-emissive display panel. The switching panel includes a first electrode, a second electrode, and a liquid crystal layer disposed between the first electrode and the second electrode. The first electrode and the second electrode are configured to control liquid crystal molecules in the liquid crystal layer. The projection device is configured to project onto the light-emitting side of the transparent self-emissive display panel. Light emitted by the projection device passes through a transmissive area of ​​the transparent self-emissive display panel.

[0008] Based on the above, the double-sided display device includes a transparent self-emissive display panel, a switching panel, and a projection device, with the projection device projecting onto the light-emitting side of the transparent self-emissive display panel. Therefore, the double-sided display device can operate in various different modes through various operations of the transparent self-emissive display panel, the switching panel, and the projection device, thereby meeting a wide variety of usage needs. Attached Figure Description

[0009] Figure 1A This is a cross-sectional schematic diagram of a transparent mode of a double-sided display device according to an embodiment of the present invention.

[0010] Figure 1B This is a cross-sectional schematic diagram of the shielding mode of a double-sided display device according to an embodiment of the present invention.

[0011] Figure 1C This is a cross-sectional schematic diagram of the augmented reality mode of a dual-sided display device according to an embodiment of the present invention.

[0012] Figure 1D This is a cross-sectional schematic diagram of a single-sided display mode of a double-sided display device according to an embodiment of the present invention.

[0013] Figure 1E This is a cross-sectional schematic diagram of the dual-sided display mode of a dual-sided display device according to an embodiment of the present invention.

[0014] Figure 2 This is a top view schematic diagram of a transparent self-emissive display panel according to an embodiment of the present invention.

[0015] Figure 3 This is a cross-sectional schematic diagram of a transparent self-emissive display panel and a switching panel according to an embodiment of the present invention.

[0016] Figure 4 This is a cross-sectional schematic diagram of a transparent self-emissive display panel and a switching panel according to another embodiment of the present invention.

[0017] Figure 5A and Figure 5B This is a cross-sectional schematic diagram of a switching panel in different states according to an embodiment of the present invention.

[0018] Figure 6A and Figure 6B This is a cross-sectional schematic diagram of a switching panel in different states according to another embodiment of the present invention.

[0019] Figures 7A to 7C This is a cross-sectional schematic diagram of a switching panel in different states according to another embodiment of the present invention.

[0020] In the attached figures, the following labels are used:

[0021] 1: Dual-sided display device

[0022] 100: Transparent self-illuminating display panel

[0023] 100A: Light-emitting side

[0024] 100B: Backside

[0025] 100L, 300L: Light

[0026] 110: First transparent substrate

[0027] 111: First insulating layer

[0028] 112: Second insulating layer

[0029] 113: Third Insulation Layer

[0030] 114: Fourth Insulation Layer

[0031] 115: Fifth Insulation Layer

[0032] 120: Circuit Structure

[0033] 121: Semiconductor layer

[0034] 122: Gate

[0035] 123: First source / drain

[0036] 124: Second source / drain

[0037] 125: First receiving pad

[0038] 126: Second pad

[0039] 129: Light-shielding layer

[0040] 130: Light Emitting Diode

[0041] 130a: Red LED

[0042] 130b: Green LED

[0043] 130c: Blue LED

[0044] 140: Light-absorbing layer

[0045] 150: Encapsulation layer

[0046] 160: Second transparent substrate

[0047] 200, 200A, 200B, 200C, 200D: Switching Panel

[0048] 201: Adhesive layer

[0049] 210: First substrate

[0050] 220: First electrode

[0051] 222: First alignment layer

[0052] 230: Liquid Crystal Layer

[0053] 232: Dichroic dyes

[0054] 234:Liquid crystal molecules

[0055] 236: Polymer-dispersed liquid crystal film

[0056] 236a: Capsules

[0057] 236b: Liquid crystal molecule

[0058] 238: Polymer Network

[0059] 240: Second electrode

[0060] 242: Second alignment layer

[0061] 250: Second substrate

[0062] 300: Projection equipment

[0063] 400: Outer transparent cover plate

[0064] 410: Carrier board

[0065] EL: Ambient Light

[0066] T: Active component

[0067] TR: Penetration Zone

[0068] NTR: Non-penetrating zone

[0069] SS: Scattering state

[0070] TS: Transparent state

[0071] UA, UB: Users Detailed Implementation

[0072] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0073] Figures 1A to 1E This is a cross-sectional schematic diagram showing various operating modes of a double-sided display device 1 according to an embodiment of the present invention. First, please refer to... Figure 1A The dual-sided display device 1 includes a transparent self-emissive display panel 100, a switching panel 200, and a projection device 300. In some embodiments, the dual-sided display device 1 further includes an outer transparent cover plate 400 and a carrier plate 410.

[0074] The transparent self-emissive display panel 100 has a light-emitting side 100A and a back side 100B opposite to the light-emitting side 100A, wherein the light-emitting side 100A can emit light, while the back side 100B does not emit light. The transparent self-emissive display panel 100 can be flat or curved. The transparent self-emissive display panel 100 is, for example, a transparent organic light-emitting diode display panel, a transparent microlight-emitting diode display panel, or other types of transparent self-emissive display panels. The transparent self-emissive display panel 100 includes light-emitting elements (such as organic light-emitting diodes, microlight-emitting diodes, or other types of light-emitting elements) so that the transparent self-emissive display panel 100 can display images on the light-emitting side 100A when it is turned on.

[0075] The switching panel 200 is disposed on the back side 100B of the transparent self-emissive display panel 100. The switching panel 200 may be flat or curved. The switching panel 200 includes a first electrode (see reference). Figure 3 and Figure 4 ), second electrode (please refer to) Figure 3 and Figure 4 ) and a liquid crystal layer disposed between the first electrode and the second electrode (see reference) Figure 3 and Figure 4 The first and second electrodes are configured to control the liquid crystal molecules in the liquid crystal layer, causing the switching panel 200 to include a scattering state and a transparent state. Specifically, by applying different voltages to the first and second electrodes to generate an electric field, the liquid crystal molecules in the liquid crystal layer are controlled by the electric field, thereby changing the haze and transmittance of the switching panel 200. The switching panel 200 in the scattering state has high haze and low transmittance, while the switching panel 200 in the transparent state has low haze and high transmittance. In some embodiments, the haze of the switching panel 200 in the scattering state is greater than 80% (e.g., 85%, 90%, 95%, or 97%), and the transmittance is less than 50% (e.g., 40%, 30%, 20%, or 10%). In some embodiments, the haze of the switching panel 200 in the transparent state is less than 15% (e.g., 10%, 5%, or 3%), and the transmittance is greater than 50% (e.g., 60%, 70%, 80%, or 90%). In some embodiments, the scattering state switching panel 200 may present a white fog state or a black fog state.

[0076] The outer transparent cover plate 400 may be made of materials such as glass, quartz, organic polymers, or other suitable transparent materials. The outer transparent cover plate 400 may be flat or curved. In some embodiments, a switching panel 200 is disposed between the outer transparent cover plate 400 and the transparent self-emissive display panel 100. This reduces the negative impact of the switching panel 200 on the image displayed on the transparent self-emissive display panel 100, and prevents a decrease in image brightness caused by the transparent self-emissive display panel 100 being blocked by the switching panel 200.

[0077] The projection device 300 is configured to project onto the light-emitting side 100A of the transparent self-emissive display panel 100. Specifically, the projection device 300 is separate from the light-emitting side 100A of the light-emitting display panel 100 and emits light onto the light-emitting side 100A of the light-emitting display panel 100 when turned on. The light emitted by the projection device 300 passes through the penetrating area of ​​the transparent self-emissive display panel 100 and illuminates the switching panel 200. In some embodiments, the projection device 300 does not overlap with the self-emissive display panel 100 in a direction perpendicular to the light-emitting side 100A of the self-emissive display panel 100, thereby preventing the projection device 300 from blocking the image emitted by the self-emissive display panel 100.

[0078] In some embodiments, the projection device 300 is disposed on the carrier plate 410. When the dual-sided display device 1 is a vehicle display panel, the carrier plate 410 is, for example, a vehicle roof. When the dual-sided display device 1 is a smart window, the carrier plate 410 is, for example, an indoor ceiling. In some embodiments, the dual-sided display device 1 is suitable for vehicle side windows, vehicle windshields, building windows, advertising boards, etc.

[0079] Please continue to refer to this. Figure 1A When the transparent self-emissive display panel 100 and the projection device 300 are turned off, and the switching panel 200 is switched to the transparent state TS, the double-sided display device 1 is in transparent mode. In transparent mode, the ambient light EL outside the double-sided display device 1 can pass through the outer transparent cover plate 400, the switching panel 200, and the penetration area of ​​the transparent self-emissive display panel 100, allowing the user UA located inside the double-sided display device 1 to see the landscape outside the double-sided display device 1.

[0080] Please refer to Figure 1B When the transparent self-emissive display panel 100 and the projection device 300 are turned off, and the switching panel 200 is switched to the scattering state SS, the double-sided display device 1 is in a shielding mode. The transmittance of the double-sided display device 1 in shielding mode is lower than that in transparent mode (e.g., ...). Figure 1A The transmittance is shown in the figure. In the shading mode, the ambient light EL on the outside of the double-sided display device 1 is blocked by the switching panel 200 of the scattering state SS, making it difficult for the ambient light EL to pass through the double-sided display device 1, thereby achieving the effect of sunshade.

[0081] Please refer to Figure 1C When the transparent self-emissive display panel 100 is turned on, the projection device 300 is turned off, and the switching panel 200 is switched to the transparent state TS, the dual-sided display device 1 is in Augmented Reality (AR) mode. In AR mode, ambient light EL from the outside of the dual-sided display device 1 can pass through the outer transparent cover 400, the switching panel 200, and the penetration area of ​​the transparent self-emissive display panel 100, allowing the user UA located inside the dual-sided display device 1 to see the landscape outside the dual-sided display device 1. At the same time, the light 100L emitted by the transparent self-emissive display panel 100 can also be seen by the user UA. In AR mode, the images generated by the transparent self-emissive display panel 100 can be used in conjunction with the external landscape. For example, when a vehicle passes by a scenic spot, the transparent self-emissive display panel 100 can generate descriptions of the scenic spot, allowing the user UA to learn about the scenic spot while visiting it through the images displayed on the transparent self-emissive display panel 100.

[0082] Please refer to Figure 1D When the transparent self-emissive display panel 100 is turned on, the projection device 300 is turned off, and the switching panel 200 is switched to the scattering state SS, the dual-sided display device 1 is in single-sided display mode. In single-sided display mode, the ambient light EL outside the dual-sided display device 1 is blocked by the scattering state SS switching panel 200, making it difficult for the ambient light EL to pass through the dual-sided display device 1, thereby achieving the effect of sunshade. At the same time, it can prevent the ambient light EL from affecting the light 100L emitted by the transparent self-emissive display panel 100. For example, the transparent self-emissive display panel 100 can be used to play movies, games, etc. in a vehicle to achieve the purpose of in-vehicle entertainment.

[0083] Please refer to Figure 1EWhen the transparent self-emissive display panel 100 and the projection device 300 are turned on, and the switching panel 200 is switched to the scattering state SS, the double-sided display device 1 is in double-sided display mode. In double-sided display mode, the ambient light EL outside the double-sided display device 1 is blocked by the switching panel 200 of the scattering state SS, making it difficult for the ambient light EL to pass through the double-sided display device 1, thereby achieving the effect of sunshade. At the same time, it can prevent the ambient light EL from affecting the light 100L emitted by the transparent self-emissive display panel 100. In addition, the projection device 300 projects onto the light-emitting side 100A of the transparent self-emissive display panel 100, and the light 300L emitted by the projection device 300 passes through the penetration area of ​​the transparent self-emissive display panel 100 and is imaged on the switching panel 200 of the scattering state SS. In dual-sided display mode, the light 100L emitted by the transparent self-emissive display panel 100 can be seen by the user UA located inside the dual-sided display device 1, while the light 300L emitted by the projection device 300 can be seen by the user UB located outside the dual-sided display device 1. For example, while the user UA uses the image generated by the transparent self-emissive display panel 100 for in-car entertainment, the user UB can see the image generated by the projection device 300 (e.g., an advertisement).

[0084] Based on the above, the dual-sided display device 1 can be operated in a variety of different modes through various operations of the transparent self-emissive display panel 100, the switching panel 200 and the projection device 300, thereby meeting a variety of usage needs.

[0085] Figure 2 This is a top view schematic diagram of a transparent self-emissive display panel according to an embodiment of the present invention. For example, Figure 2 yes Figures 1A to 1E A top view schematic diagram of the transparent self-emissive display panel 100 in the double-sided display device 1. Please refer to... Figure 2 The transparent self-emissive display panel 100 has a transmissive region TR and a non-transmissive region NTR. The circuit structure 120 and a plurality of light-emitting diodes 130 are located in the non-transmissive region NTR. Figure 2 In this diagram, circuit structure 120 is shown with a dashed outline, and its specific circuit layout is omitted. Circuit structure 120 includes, for example, metal wires, active components, passive components, or other components. A light-emitting diode (LED) 130 is disposed on and electrically connected to circuit structure 120. In this embodiment, LED 130 is a miniature LED and includes a red LED 130a, a green LED 130b, and a blue LED 130c.

[0086] A light-absorbing layer 140 is located on the circuit structure 120 and defines a non-transmitting region (NTR) and a transmissive region (TR). The light-absorbing layer 140 is, for example, black resin, black metal, or other suitable material. The light-absorbing layer 140 has low reflectivity, thereby preventing light emitted by the projection device from being reflected by the transparent self-emissive display panel 100. Furthermore, the light-absorbing layer 140 has low transmittance, thereby preventing the circuit structure 120 from affecting the image displayed on the transparent self-emissive display panel 100.

[0087] Figure 3 This is a cross-sectional schematic diagram of a transparent self-emissive display panel 100 and a switching panel 200 according to an embodiment of the present invention. For example, Figure 3 The transparent self-emissive display panel 100 corresponds to Figure 2 The position of line A-A'. Please refer to... Figure 3 The transparent self-emissive display panel 100 includes a first transparent substrate 110, a first insulating layer 111, a second insulating layer 112, a third insulating layer 113, a fourth insulating layer 114, a fifth insulating layer 115, a circuit structure 120, a plurality of light-emitting diodes 130, a light-absorbing layer 140, an encapsulation layer 150, and a second transparent substrate 160.

[0088] The circuit structure 120 is located in the non-transparent region NTR of the transparent self-emissive display panel 100. In this embodiment, the circuit structure 120 includes an active element T, a first pad 125, and a second pad 126. The active element T includes a semiconductor layer 121, a gate 122, a first source / drain 123, a second source / drain 124, and a light-shielding layer 129. The light-shielding layer 129 is located on the first transparent substrate 110 and in the non-transparent region NTR. A first insulating layer 111 is located on the first transparent substrate 110 and the light-shielding layer 129, and covers the light-shielding layer 129. The semiconductor layer 121 is located on the first insulating layer 111 and overlaps the light-shielding layer 129. By providing the light-shielding layer 129, the problem of leakage current caused by light exposure of the active element T can be improved. A second insulating layer 112 is located on the first insulating layer 111 and the semiconductor layer 121, and covers the semiconductor layer 121. Gate 122 is located above the second insulating layer 112, and the second insulating layer 112 separates gate 122 from semiconductor layer 121. A third insulating layer 113 is located above the second insulating layer 112 and gate 122, and covers gate 122. A first source / drain 123 and a second source / drain 124 are located above the third insulating layer 113 and are electrically connected to semiconductor layer 121. In this embodiment, the second insulating layer 112 and the third insulating layer 113 have multiple vias overlapping semiconductor layer 121, and the first source / drain 123 and the second source / drain 124 are respectively filled into the aforementioned vias to be electrically connected to semiconductor layer 121.

[0089] A fourth insulating layer 114 is located above the first source / drain 123 and the second source / drain 124. A fifth insulating layer 115 is located above the fourth insulating layer 114. A first pad 125 and a second pad 126 are located above the fifth insulating layer 115. In this embodiment, the fourth insulating layer 114 and the fifth insulating layer 115 have through-holes overlapping the second source / drain 124, and the first pad 125 is filled into the aforementioned through-holes to be electrically connected to the second source / drain 124.

[0090] In some embodiments, the semiconductor layer 121 is a single-layer or multi-layer structure, comprising amorphous silicon, polycrystalline silicon, microcrystalline silicon, monocrystalline silicon, organic semiconductor materials, oxide semiconductor materials (e.g., indium zinc oxide, indium gallium zinc oxide, or other suitable materials, or combinations thereof), or other suitable materials or combinations thereof.

[0091] In some embodiments, the gate 122, the first source / drain 123, and the second source / drain 124 are each a single-layer or multi-layer structure, and their materials include, for example, metals such as chromium, gold, silver, copper, tin, lead, hafnium, tungsten, molybdenum, neodymium, titanium, tantalum, aluminum, zinc, nickel, alloys of the above metals, stacks of the above metals, or other conductive materials.

[0092] In some embodiments, the materials of the first insulating layer 111, the second insulating layer 112, the third insulating layer 113, the fourth insulating layer 114, and the fifth insulating layer 115 include, for example, silicon oxide, silicon nitride, silicon oxynitride, alumina organic insulating materials, or other suitable insulating materials.

[0093] In this embodiment, the active element T is exemplified by a top-gate thin-film transistor, but the invention is not limited thereto. In other embodiments, the active element T may also be a bottom-gate thin-film transistor, a dual-gate thin-film transistor, or other types of thin-film transistors.

[0094] In some embodiments, the first insulating layer 111, the second insulating layer 112, the third insulating layer 113, and the fourth insulating layer 114 each have an opening located in the penetration region TR. By designing the aforementioned opening, the influence of the first insulating layer 111, the second insulating layer 112, the third insulating layer 113, and the fourth insulating layer 114 on the transmittance of the penetration region TR can be reduced.

[0095] In some embodiments, the circuit structure 120 may include more conductive and insulating layers, and the present invention does not limit the specific circuit layout of the circuit structure 120.

[0096] The light-emitting diode 130 is disposed on the circuit structure 120 and located in the non-transmittent region NTR of the transparent self-emissive display panel 100. The light-emitting diode 130 is bonded to the first pad 125 and the second pad 126.

[0097] The light-absorbing layer 140 is located on the first transparent substrate 110 and defines the non-transmitting region NTR and the transmitting region TR. In this embodiment, the light-absorbing layer 140 is formed on the fifth insulating layer 115, but the invention is not limited thereto. In other embodiments, any one of the first insulating layer 111, the second insulating layer 112, the third insulating layer 113, and the fourth insulating layer 114 may include a light-absorbing material and can be used as a light-absorbing layer.

[0098] The encapsulation layer 150 covers the light-emitting diode 130. A second transparent substrate 160 is disposed on the encapsulation layer 150.

[0099] A switching panel 200 is disposed on the back side of the transparent self-emissive display panel 100. The switching panel 200 includes a first electrode 220, a second electrode 240, and a liquid crystal layer 230 disposed between the first electrode 220 and the second electrode 240. In this embodiment, the switching panel 200 may optionally include a first substrate 210 and a second substrate 250. The first electrode 220, the second electrode 240, and the liquid crystal layer 230 are located between the first substrate 210 and the second substrate 250.

[0100] In this embodiment, the switching panel 200 is attached to the back side of the transparent self-emissive display panel 100 via an adhesive layer 201. The light-emitting diode 130 is further away from the switching panel 200 than the first transparent substrate 110. The first electrode 220, liquid crystal layer 230, and second electrode 240 of the switching panel 200 overlap the non-transparent region NTR and the transparent region TR of the transparent self-emissive display panel 100.

[0101] Figure 4 This is a cross-sectional schematic diagram of a transparent self-emissive display panel 100 and a switching panel 200A according to another embodiment of the present invention. It must be noted here that... Figure 4 The embodiments follow Figure 3 The component reference numerals and partial contents of the embodiments are described below, wherein the same or similar reference numerals are used to represent the same or similar components, and descriptions of the same technical content are omitted. For explanations of the omitted parts, please refer to the foregoing embodiments, and will not be repeated here.

[0102] Please refer to Figure 4 In this embodiment, the switching panel 200A is directly formed on the back side of the first transparent substrate 110. In this embodiment, the first electrode 220 of the switching panel 200A is directly formed on the back side of the first transparent substrate 110 and contacts the back side of the first transparent substrate 110.

[0103] Figure 5A and Figure 5BThis is a cross-sectional schematic diagram of a switching panel 200B in different states according to an embodiment of the present invention. Please refer to... Figure 5A and Figure 5B The switching panel 200B includes a first electrode 220, a second electrode 240, and a liquid crystal layer 230 disposed between the first electrode 220 and the second electrode 240.

[0104] In this embodiment, the liquid crystal layer 230 includes liquid crystal molecules 234 and a dichroic dye 232, wherein the dichroic dye 232 is mixed with the liquid crystal molecules 234. The liquid crystal molecules 234 are, for example, cholesteric liquid crystals. In other words, the liquid crystal layer 230 includes, for example, dye-doped cholesteric liquid crystals.

[0105] When the driving voltage exceeds the saturation voltage (V) H When dye-doped cholesterol-type liquid crystals switch to the vertical mode (e.g.) Figure 5A As shown, in this state, the optical axes of the liquid crystal molecules are neatly parallel to the electric field between the first electrode 220 and the second electrode 240. Therefore, only a small amount of incident light is absorbed by the liquid crystal layer 230, resulting in the switching panel 200B having high transparency and low haze.

[0106] If through a step voltage (V) FC Releasing the driving voltage suppresses the elastic restoring force of the liquid crystal molecules. At this point, the dye-doped cholesteric liquid crystal switches to the focal-conic (FC) state, as... Figure 5B As shown. In this state, the incident light is simultaneously absorbed and scattered, resulting in the switching panel 200B having low transparency and high haze.

[0107] The switching panel 200B of this embodiment can be applied to the double-sided display device of any of the foregoing embodiments.

[0108] Figure 6A and Figure 6B This is a cross-sectional schematic diagram of a switching panel 200C in different states according to another embodiment of the present invention. Please refer to... Figure 6A and Figure 6B The switching panel 200C includes a first electrode 220, a second electrode 240, and a liquid crystal layer 230 disposed between the first electrode 220 and the second electrode 240.

[0109] In this embodiment, the liquid crystal layer 230 includes liquid crystal molecules 234, a dichroic dye 232, and a polymer-dispersed liquid crystal film (PDLC film) 236. The dichroic dye 232 is mixed with the liquid crystal molecules 234. The liquid crystal molecules 234 are, for example, cholesteric liquid crystals. In other words, the liquid crystal molecules 234 and the dichroic dye 232 in the liquid crystal layer 230 can also be collectively referred to as dye-doped cholesteric liquid crystals. The polymer-dispersed liquid crystal film 236 includes capsules 236a. Each capsule 236a contains a plurality of liquid crystal molecules 236b. The capsules 236a include, for example, a polymer. In some embodiments, the capsules 236a are, for example, nanocapsules, and their size is between 100 nanometers and 200 nanometers. The liquid crystal molecules 234 and the liquid crystal molecules 236b are, for example, the same type or different types of liquid crystal molecules.

[0110] In this embodiment, in addition to controlling the dye-doped cholesteric liquid crystal using the electric field between the first electrode 220 and the second electrode 240, the liquid crystal molecules 236b in the capsule 236a can also be controlled, thereby enabling the switching panel 200C to be in a transparent state (e.g., Figure 6A (as shown) and scattering states (such as) Figure 6B Switch between (as shown).

[0111] The switching panel 200C of this embodiment can be applied to the double-sided display device of any of the foregoing embodiments.

[0112] Figures 7A to 7C This is a cross-sectional schematic diagram of a switching panel 200D in different states according to another embodiment of the present invention. Please refer to... Figures 7A to 7C The switching panel 200D includes a first electrode 220, a second electrode 240, and a liquid crystal layer 230 disposed between the first electrode 220 and the second electrode 240. In this embodiment, the switching panel 200D further includes a first alignment layer 222 disposed between the first electrode 220 and the liquid crystal layer 230, and a second alignment layer 242 disposed between the second electrode 240 and the liquid crystal layer 230.

[0113] In this embodiment, the liquid crystal layer 230 includes liquid crystal molecules 234, dichroic dye 232, and polymer network 238. The dichroic dye 232 is mixed with the liquid crystal molecules 234. In this embodiment, the liquid crystal layer 230 is a polymer network liquid crystal (PNLC) layer.

[0114] In this embodiment, the electric field between the first electrode 220 and the second electrode 240 can be used to control the liquid crystal molecules 234 and the dichroic dye 232, thereby enabling the switching panel 200D to be in a transparent state (e.g., Figure 7A (as shown) and scattering states (such as) Figure 7C Switching between (as shown). For example, when the voltage difference between the first electrode 220 and the second electrode 240 is 0, the switching panel 200D is in a transparent state, as shown. Figure 7A As shown. When the voltage difference between the first electrode 220 and the second electrode 240 is greater than the threshold voltage (V th When the electric field is applied, the liquid crystal molecules 234 and the dichroic dye 232 begin to tilt, as shown below. Figure 7B As shown. When the voltage difference between the first electrode 220 and the second electrode 240 is significantly greater than the threshold voltage, the liquid crystal molecules 234 and the dichroic dye 232 lie horizontally under the influence of the electric field, as... Figure 7C As shown.

[0115] The switching panel 200D of this embodiment can be applied to the double-sided display device of any of the foregoing embodiments.

[0116] In summary, the dual-sided display device of the present invention includes a transparent self-emissive display panel, a switching panel, and a projection device. Through various operations of the transparent self-emissive display panel, the switching panel, and the projection device, the dual-sided display device includes a transparent mode, a masking mode, an augmented reality mode, a single-sided display mode, and a dual-sided display mode, thereby meeting a variety of usage needs.

[0117] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A double-sided display device, characterized in that, include: A transparent self-emissive display panel has a light-emitting side and a back side opposite to the light-emitting side, wherein the transparent self-emissive display panel includes a transmissive area and a non-transmissive area, and a plurality of light-emitting diodes are located in the non-transmissive area; A switching panel is disposed on the back side of the transparent self-emissive display panel, wherein the switching panel includes: A first electrode; A second electrode; and A liquid crystal layer is disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are configured to control the liquid crystal molecules in the liquid crystal layer, such that the switching panel includes a scattering state and a transparent state; and A projection device is configured to project onto the emitting side of the transparent self-emissive display panel; wherein: The dual-sided display device is configured to operate in transparent mode, masked mode, augmented reality mode, single-sided display mode, or dual-sided display mode. In transparent mode, the transparent self-emissive display panel and the projection device are turned off, and the switching panel is switched to the transparent state, so that the double-sided display device is in transparent mode; In the shielding mode, the transparent self-emissive display panel and the projection device are turned off, and the switching panel is switched to the scattering state. The dual-sided display device is in the shielding mode, wherein the transmittance of the dual-sided display device in the shielding mode is lower than the transmittance of the dual-sided display device in the transparent mode. In augmented reality mode, the transparent self-emissive display panel is turned on, the projection device is turned off, and the switching panel is switched to the transparent state, so that the dual-sided display device is in augmented reality mode; In single-sided display mode, the transparent self-emissive display panel is turned on, the projection device is turned off, and the switching panel is switched to the scattering state, thus placing the dual-sided display device in single-sided display mode; and In dual-sided display mode, the transparent self-emissive display panel and the projection device are turned on, and the switching panel is switched to the scattering state, so that the dual-sided display device is in dual-sided display mode; In this dual-sided display mode, the projection device is separated from the light-emitting side of the transparent self-emissive display panel. The projection device projects onto the light-emitting side of the transparent self-emissive display panel. The light emitted by the projection device passes through the penetration area of ​​the transparent self-emissive display panel and forms a first image on the switching panel in the scattering state. The light-emitting diodes form a second image on the light-emitting side of the transparent self-emissive display panel.

2. The double-sided display device as described in claim 1, characterized in that, The haze of the switching panel in the scattering state is greater than 80%, and the haze of the switching panel in the transparent state is less than 15%.

3. The double-sided display device as described in claim 1, characterized in that, The transmittance of the switching panel in the transparent state is greater than 50%, and the transmittance of the switching panel in the scattering state is less than 50%.

4. The double-sided display device as described in claim 1, characterized in that, Including: An outer transparent cover plate, wherein the switching panel is disposed between the outer transparent cover plate and the transparent self-illuminating display panel.

5. The double-sided display device as described in claim 1, characterized in that, The liquid crystal molecules in the liquid crystal layer include cholesterol liquid crystals, and the liquid crystal layer further includes dichroic dyes.

6. The double-sided display device as described in claim 1, characterized in that, The liquid crystal layer includes a dichroic dye mixed with the liquid crystal molecules, and the liquid crystal layer also includes a polymer-dispersed liquid crystal film or a polymer network.

7. The double-sided display device as claimed in claim 1, characterized in that, The transparent self-emissive display panel includes: A transparent substrate; A light-absorbing layer is located on the transparent substrate and defines the non-transparent area and the transparent area, wherein the first electrode, the liquid crystal layer and the second electrode of the switching panel overlap the non-transparent area and the transparent area; A circuit structure is located in the non-transparent area of ​​the transparent self-emissive display panel; and These light-emitting diodes are disposed on the circuit structure and located in the non-transparent area of ​​the transparent self-emissive display panel, wherein these light-emitting diodes are further away from the switching panel than the transparent substrate.

8. The double-sided display device as claimed in claim 1, characterized in that, The transparent self-emissive display panel includes a transparent substrate, and the first electrode is in direct contact with the back side of the transparent substrate.

9. A double-sided display device, characterized in that, include: A transparent self-emissive display panel has a light-emitting side and a back side opposite to the light-emitting side, wherein the transparent self-emissive display panel includes: A transparent substrate; A light-absorbing layer is located on the transparent substrate, defining a non-transparent region and a transparent region. A circuit structure is located in the non-transparent area of ​​the transparent self-emissive display panel; and Multiple light-emitting diodes are disposed on the circuit structure and located in the non-transparent area of ​​the transparent self-emissive display panel, wherein the light-emitting diodes are further away from the switching panel than the transparent substrate; A switching panel is disposed on the back side of the transparent self-emissive display panel, wherein the switching panel includes: A first electrode; A second electrode; and A liquid crystal layer is disposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are configured to control liquid crystal molecules in the liquid crystal layer; and A projection device is configured to project onto the emitting side of the transparent self-emissive display panel; In the dual-sided display mode, the light emitted by the projection device passes through the penetrating area of ​​the transparent self-emissive display panel and forms a first image on the switching panel, while the light emitted by the light-emitting diodes forms a second image on the light-emitting side of the transparent self-emissive display panel.

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