Display device

Abstract

The embodiment of the application discloses a display device, and relates to the technical field of display. The display device comprises a display panel and a peep-proof film. The peep-proof film comprises a plurality of wire grids arranged at intervals. The gaps of the plurality of wire grids form a plurality of slits, and the plurality of slits are filled with a light-transmitting medium. The refractive indexes of the wire grids and the light-transmitting medium are different. According to the technical scheme disclosed in the embodiment of the application, the peep-proof effect can be selectively opened, the transmittance of screen light can be ensured, user visual fatigue can be avoided, and when there is no power supply, the peep-proof film can be used as a polaroid. In addition, the scattering function of the light-transmitting medium can also widen the viewing angle.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display device. Background Technology

[0002] Display products are now widely used in personal display devices, and for the sake of user privacy, the demand for privacy protection features will inevitably become more and more common.

[0003] While current privacy screen protectors do offer privacy protection, they are primarily based on the principle of venetian blinds. Although this protector can prevent peeping, it reduces light transmittance, significantly decreasing the surface brightness of the display device. This results in an overly dark screen that can cause eye strain and urgently needs improvement. Summary of the Invention

[0004] The purpose of this application is to provide a display device that uses multiple wire grids to form multiple slits and fills the multiple slits with a light-transmitting medium. By influencing the reflective phase of the light-transmitting medium with an electric field, the polarized light is modulated, thereby achieving a visual privacy protection effect while improving the screen transmittance and avoiding visual fatigue for the user.

[0005] This application provides a display device, including a display panel and a privacy film disposed on one side of the light-emitting side of the display panel. The privacy film includes a plurality of spaced wire grids, the gaps between the plurality of wire grids forming a plurality of slits, and the plurality of slits are filled with a light-transmitting medium; the refractive indices of the wire grids and the light-transmitting medium are different.

[0006] Optionally, in some embodiments of this application, the plurality of wire grids are parallel to each other and are arranged at equal intervals;

[0007] Alternatively, the plurality of wire grids are parallel to each other, and their spacing decreases from the center of the privacy film to both sides.

[0008] Optionally, in some embodiments of this application, when the plurality of wire grids are parallel to each other and are arranged at equal intervals, the refractive index of the light-transmitting medium increases from the center of the privacy film to both sides.

[0009] Optionally, in some embodiments of this application, when the plurality of wire grids are parallel to each other and their spacing decreases from the middle of the privacy film to both sides, the width of the wire grids increases from the middle of the privacy film to both sides, and the refractive index of the light-transmitting medium in each of the slits is equal.

[0010] Optionally, in some embodiments of this application, the material of the light-transmitting medium is acrylic resin or epoxy resin.

[0011] Optionally, in some embodiments of this application, the interior of the light-transmitting medium is provided with a plurality of uniformly distributed transparent microspheres.

[0012] Optionally, in some embodiments of this application, the transparent microspheres are made of polycarbonate, acrylic resin or polysiloxane resin, and the refractive index of the transparent microspheres is 1.6-1.7.

[0013] Optionally, in some embodiments of this application, the privacy film further includes:

[0014] An intermediate dielectric layer is disposed on the side of the privacy film near the display panel, and is used to carry the plurality of wire grids and the light-transmitting intermediate dielectric layer.

[0015] Optionally, in some embodiments of this application, the display panel includes:

[0016] Color filter substrate; and

[0017] A reflective layer is disposed on one side of the color filter substrate;

[0018] The reflective layer is located between the color filter substrate and the privacy film, and the reflective layer is a reflective polarizer.

[0019] Optionally, in some embodiments of this application, the reflective layer constitutes the upper polarizer of the display panel.

[0020] The beneficial effects of the embodiments of this application are as follows:

[0021] In this embodiment of the application, a display device is provided, including a display panel and a privacy film. The privacy film uses multiple wire grids to form multiple slits and fills the multiple slits with a light-transmitting medium. By applying voltage to the multiple wire grids, the reflective phase of the light-transmitting medium is changed, thereby modulating polarized light and replacing the traditional venetian blind structure. This achieves a visual privacy effect while improving the screen transmittance and avoiding visual fatigue for the user.

[0022] Meanwhile, this privacy film can be directly attached to existing display devices without altering their structure, making it more practical and convenient to use. Furthermore, when the grid is not energized, the metasurface layer can function as a metallic polarizer, placing the privacy film in a high-transmittance state. The refractive index difference introduced by the light-transmitting medium, through its scattering function, further widens the viewing angle of the display device. Therefore, this display device not only achieves privacy protection but also allows for selective activation of the privacy function, offering greater flexibility and convenience. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of this application;

[0025] Figure 2 This is a cross-sectional schematic diagram of a privacy film provided in an embodiment of this application;

[0026] Figure 3 This is a top view of a privacy film provided in an embodiment of this application;

[0027] Figure 4 This is a top view of a privacy film provided in another embodiment of this application;

[0028] Figure 5 This is a partial cross-sectional schematic diagram of a privacy film provided in an embodiment of this application, mainly used to illustrate transparent microspheres;

[0029] Figure 6 This is a schematic diagram of the structure of an intermediate medium layer provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures: 100, privacy film; 110, intermediate dielectric layer; 111, substrate; 112, surface film layer; 120, metasurface layer; 121, wire grid; 122, light-transmitting medium; 1221, transparent microsphere; 130, slit; 200, backlight; 300, polarizer; 400, array substrate; 500, color filter substrate; 600, liquid crystal; 700, reflective layer. Detailed Implementation

[0031] The technical solutions of 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 of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0032] Currently, display products are widely used in personal display devices. For user privacy, the demand for display devices with privacy features will inevitably become increasingly common. Currently, privacy films are mainly based on the principle of venetian blinds. While this type of privacy film can achieve privacy, it significantly reduces the surface brightness of the display device, posing a considerable drawback.

[0033] In recent years, with the rapid development of micro-nano fabrication technology and metal surface plasma, local phase modulation can be performed based on metasurfaces. The plasma propagation constant of the metal slit 130 can be used to achieve flexible local phase adjustment by utilizing the variation characteristics of the slit 130 width. Based on this, the catadioptric reflection law of metasurfaces can be established.

[0034] The width and period of each line in the grating are much smaller than the wavelength. When the polarization direction is parallel to the grating, it induces a current in the grating, resulting in strong absorption in the grating's response to light. When perpendicular, because the grating's size is much smaller than the wavelength, no resonance is achieved, and light can be transmitted. Its period is very small, and under normal incidence, its diffraction gate angle is very large. According to scattering theory, as the angle of the diffraction gate increases, the energy held by the gate decreases. At some wavelengths, the gate even exceeds the diffraction limit, meaning there is no diffraction gate.

[0035] Based on the above theory, this application provides a display device, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments.

[0036] Please see Figure 1 This embodiment provides a display device that can adopt different display modes such as OLED, LCD, MLED and VA. It includes a display panel and a privacy film 100 disposed on the light-emitting side of the display panel. The privacy film 100 can increase the privacy effect of the display panel, thereby enabling the display device as a whole to achieve privacy function.

[0037] Please see Figure 2 In this embodiment, the privacy film includes an intermediate medium layer 110 and a metasurface layer 120 disposed on one side of the intermediate medium layer 110.

[0038] Among them, the metasurface layer 120 is a nanostructure layer that can modulate polarized light and narrow the emitted light to reduce the side angle of light emission, thereby achieving a visual privacy protection effect while ensuring light filtering.

[0039] In this embodiment, the metasurface layer 120 includes a plurality of wire grids 121 spaced apart on the intermediate dielectric layer 110, and the plurality of wire grids 121 are parallel to each other on the intermediate dielectric layer 110. The gaps between the wire grids 121 form a plurality of slits 130, and each slit 130 is filled with a light-transmitting medium 122.

[0040] The multiple wire grids 121 can be understood as multiple strip-shaped metals arranged in parallel and spaced apart on the surface of the intermediate dielectric layer 110. The material of the wire grids 121 can be flexibly selected as needed. For example, the material of the wire grids 121 can be nickel, aluminum or other conductive materials, and there is no specific limitation on this.

[0041] In the actual fabrication of the wire grid 121, multiple wire grids 121 can be imprinted onto the intermediate dielectric layer 110 using nanoimprinting to make them a single unit. Alternatively, other methods can be used to form the aforementioned multiple wire grids 121. No specific limitation is made in this regard.

[0042] Similarly, the material of the light-transmitting medium 122 can be flexibly selected. For example, the light-transmitting medium 122 can be made of acrylic resin or epoxy resin, or other similar resin materials, and there are no specific limitations on this. However, when determining the material of the light-transmitting medium 122 and actually filling it, the refractive index of the light-transmitting medium 122 should be adjustable, and the refractive index of the light-transmitting medium 122 should be controlled within the range of 1.2-1.8.

[0043] When filling the multiple slits 130 with the light-transmitting medium 122, it can be done by a single layer filling or by two or more layers filling, without any specific limitation.

[0044] It should be noted that when multiple grids 121 and light-transmitting medium 122 are actually set, the spacing of the grids 121 and the refractive index of the light-transmitting medium 122 will affect the final privacy protection effect of the privacy film. At the same time, the refractive indices of the grids 121 and the light-transmitting medium should be different, that is, the refractive index of the grids 121 is greater than the refractive index of the light-transmitting medium 122, or the refractive index of the light-transmitting medium 122 is greater than the refractive index of the grids 121. Specifically, the refractive index values ​​of the grids 121 and the light-transmitting medium 122 are not limited here.

[0045] like Figure 3 As shown, in one embodiment, to ensure the privacy effect of the privacy film, the plurality of wire grids 121 can be arranged at equal intervals on the intermediate medium layer 110. In this case, the refractive index of the light-transmitting medium 122 filled between the plurality of wire grids 121 can be arranged to increase from the middle of the privacy film to both sides.

[0046] like Figure 4As shown, in another embodiment, to ensure the privacy film's privacy protection effect, the spacing of the plurality of wire grids 121 decreases from the center of the privacy film to both sides, while the width of the wire grids 121 increases from the center of the privacy film to both sides. In this case, the refractive index of the light-transmitting medium 122 filling each slit 130 can be the same. Specifically, the width of the wire grids 121 can be controlled between 30-90 μm, and their height on the intermediate medium layer 110 can be 100-180 μm; the width of the slits 130 can also be controlled between 30-90 μm.

[0047] For example, in one embodiment, the aforementioned multiple wire grids 121 can be arranged at equal intervals on the intermediate dielectric layer 110. In this case, the width of both the wire grids 121 and the slits 130 can be 60 μm, and the refractive index of the light-transmitting medium 122 filling each slit 130 is arranged to increase from the center of the privacy film to both sides, but not exceeding 1.8.

[0048] For example, in another embodiment, the spacing of the plurality of wire grids 121 decreases from the center of the privacy film to both sides, while the width of the wire grids 121 increases from the center of the privacy film to both sides. In this case, the width of the wire grid 121 located in the middle of the privacy film can be 30 μm, while the width of each wire grid 121 arranged on both sides of the privacy film can increase sequentially from 30 μm (not exceeding 90 μm). The width of the slit 130 located in the middle of the privacy film (or the width of the light-transmitting medium) can be 90 μm, while the width of each slit 130 arranged on both sides of the privacy film can decrease sequentially from 90 μm (not less than 30 μm). In this case, the refractive index of the light-transmitting medium 122 in each slit 130 can remain consistent.

[0049] It is understood that the dimensions of the wire grid 121 and the slit 130 described above are only preferred embodiments based on experiments in this application, and their specific dimensions can still be flexibly optimized and designed as needed, without any specific limitation.

[0050] Based on the characteristic that the plasma propagation constant of the metal slit changes with the slit width, in this embodiment, when actually molding the aforementioned wire grid 121 and light-transmitting medium 122, the phase angle of the emitted light can be arbitrarily varied within the required range by changing the width of the slit 130 in the wire grid 121. That is, the phase angle of the emitted light can be flexibly adjusted by changing the width of the wire grid 121 and the slit 130 on the intermediate dielectric layer 110. Therefore, with the help of the aforementioned wire grid 121 and light-transmitting medium 122, this embodiment can meet diverse modulation requirements within the required range to flexibly control the phase angle of the emitted light, thereby flexibly adjusting the viewing angle of the corresponding display screen.

[0051] In practical applications, with the help of the aforementioned multiple grids 121 and light-transmitting medium 122, when the grids 121 are not energized, the privacy film 100 can transmit all incident light. At this time, due to the influence of the refractive index of the light-transmitting medium 122, the light will be further scattered when it passes through, thereby enabling the corresponding display device to obtain a wide viewing angle display effect. At this time, the privacy film 100 does not have a privacy protection effect, but can play a role similar to a polarizer.

[0052] When a voltage is applied to the wire grid 121, such as when any two adjacent wire grids 121 are connected to the positive and negative terminals of the power supply element respectively, an electric field will be formed between the two adjacent wire grids 121, which will excite the electromagnetic resonance of the metal micro-nano structure, thereby enhancing the reflective phase of the light-transmitting medium 122 and exhibiting a certain reflection efficiency, achieving the effect of blurry side angle imaging and realizing the privacy function.

[0053] It should be understood that the display device provided in this application embodiment can change the actual function of the privacy film 100 by controlling the energization state of the wire grid 121, thereby changing the display effect of the display device. When not powered on, the privacy film 100 can be used as a metallic polarizer; while when powered on, the privacy film 100 can achieve a visual privacy effect. Therefore, the privacy effect of the display device provided in this application embodiment can be selectively turned on or off according to user needs, making it more flexible in use.

[0054] In this embodiment, the privacy film 100 includes an intermediate medium layer 110 and a metasurface layer 120 disposed on the intermediate medium layer 110; however, the intermediate medium layer 110 can also be omitted. That is, in another embodiment, the privacy film may not include the intermediate medium layer 110, and it may be composed solely of the metasurface layer 120, which can also achieve the privacy effect.

[0055] Please see Figure 2 and Figure 5 In this embodiment, when filling the slit 130 with the light-transmitting medium 122, the filling height of the light-transmitting medium 122 can be higher than the height of the wire grid 121. The specific size of the light-transmitting medium 122 exceeding the wire grid 121 can be flexibly optimized as needed. For example, the light-transmitting medium 122 can exceed the wire grid 121um, 15um, 20um, 25um or other sizes, without specific limitations.

[0056] In one embodiment, to further improve the privacy protection effect, when actually molding the light-transmitting medium 122, a plurality of transparent microspheres 1221 can be filled into the light-transmitting medium 122; the material of the transparent microspheres 1221 can be polycarbonate (PC), acrylic resin or polysiloxane resin; the plurality of transparent microspheres 1221 can be uniformly dispersed in the light-transmitting medium 122 system, and the refractive index of the transparent microspheres 1221 can be controlled at 1.6-1.7, the specific value of which can be determined according to the design requirements.

[0057] In another embodiment, to extend the service life of the privacy film 100, an anti-glare film and / or a high-hardness protective film are provided on the side of the metasurface layer 120 away from the intermediate medium layer 110. The protective film can be acrylic resin or other materials, and there is no specific limitation on this.

[0058] Please see Figure 2 and Figure 6 The aforementioned intermediate dielectric layer 110 can be a single-layer substrate 111 or a multi-layer composite stacked structure.

[0059] In one embodiment, the intermediate dielectric layer 110 is a single-layer substrate 111; in this case, the substrate 111 can be a rigid substrate or a flexible substrate. When the intermediate dielectric layer 110 is a rigid substrate, it can be a base glass; when the intermediate dielectric layer 110 is a flexible substrate, it can be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer can be polyimide (PI) or polyethylene terephthalate (PET), etc.; the organic-inorganic doped composite can be polyimide, an organic polymer, doped with glass fibers. Since glass fibers have high toughness, they can significantly improve the flexible strength of the intermediate dielectric layer 110, making the intermediate dielectric layer 110 less prone to breakage and peeling.

[0060] In another embodiment, the intermediate dielectric layer 110 is a multilayer composite stacked structure, which includes a substrate 111 and a surface film layer 112 disposed on the side of the substrate 111 near the metasurface layer 120.

[0061] At this time, the substrate 111 can be a rigid substrate or a flexible substrate. When the intermediate dielectric layer 110 uses a rigid substrate, it can be a base glass; when the intermediate dielectric layer 110 uses a flexible substrate, it can be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer can be polyimide (PI) or polyethylene terephthalate (PET), etc.; the organic-inorganic doped composite can be polyimide, an organic polymer, doped with glass fibers. Since glass fibers have high toughness, they can significantly improve the flexible strength of the intermediate dielectric layer 110, making the intermediate dielectric layer 110 less prone to breakage and peeling.

[0062] The aforementioned surface film layer 112 can be any one of triacetyl cellulose film (TAC) or polyethylene terephthalate (PET), or it can be a stack of TAC and PET, without any specific limitation.

[0063] In this embodiment, the display panel can be any of OLED, LCD, MLED, VA, and other types of display panels, without specific limitation. That is, the display device provided in this application embodiment can adopt different display modes such as OLED, LCD, MLED, and VA, and its privacy protection function is not selectively dependent on various display modes and can be applied to all of them. Meanwhile, the display device includes any product or component with display function, such as mobile phones, tablets, televisions, monitors, laptops, digital photo frames, and navigators.

[0064] Please see Figure 1 In one embodiment, the display panel is an LCD display panel, which includes a backlight 200, a polarizer 300 disposed on one side of the backlight 200, an array substrate 400 disposed on the side of the polarizer 300 opposite to the backlight 200, a color filter substrate 500 disposed on the side of the array substrate 400 opposite to the polarizer 300, liquid crystal 600 disposed between the array substrate 400 and the color filter substrate 500, and a reflective layer 700 disposed on the side of the color filter substrate 500 opposite to the array substrate 400. The privacy film 100 is disposed on the side of the reflective layer 700 opposite to the color filter substrate 500.

[0065] It should be noted that the aforementioned reflective layer 700 can be a conventional polarizer or a reflective polarizer; however, considering the privacy protection effect, the reflective layer 700 is preferably a reflective polarizer. That is, in practical applications, a reflective polarizer can be used to replace the ordinary polarizer used in the upper polarizer of a traditional LCD display panel. In other words, the aforementioned reflective layer 700 can constitute the upper polarizer on the corresponding display panel. In this way, when ambient light enters the metasurface layer 120, the reflective polarizer can increase the reflection and re-emission of the ambient light entering the metasurface layer 120, which facilitates the formation of interference light to reduce the visibility of the screen at the privacy angle.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The above provides a detailed description of a display device provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A display device, characterized in that, The device includes a display panel and a privacy film disposed on one side of the light-emitting side of the display panel. The privacy film includes a plurality of spaced wire grids, the gaps between the plurality of wire grids forming a plurality of slits, and the plurality of slits being filled with a light-transmitting medium. The refractive indices of the wire grids and the light-transmitting medium are different. The plurality of wire grids are parallel to each other and are arranged at equal intervals, and the refractive index of the light-transmitting medium increases from the middle of the privacy film to both sides. Alternatively, the multiple wire grids are parallel to each other, and their spacing decreases from the middle of the privacy film to both sides, the width of the wire grids increases from the middle of the privacy film to both sides, and the refractive index of the light-transmitting medium in each of the slits is equal.

2. The display device according to claim 1, characterized in that, The light-transmitting medium is made of acrylic resin or epoxy resin.

3. The display device according to claim 2, characterized in that, The interior of the light-transmitting medium contains a plurality of uniformly distributed transparent microspheres.

4. The display device according to claim 3, characterized in that, The transparent microspheres are made of polycarbonate, acrylic resin or polysiloxane resin, and the refractive index of the transparent microspheres is 1.6-1.

7.

5. The display device according to any one of claims 1-4, characterized in that, The privacy film also includes: An intermediate dielectric layer is disposed on the side of the privacy film near the display panel, and is used to carry the plurality of wire grids and the light-transmitting medium.

6. The display device according to any one of claims 1-4, characterized in that, The display panel includes: Color filter substrate; and A reflective layer is disposed on one side of the color filter substrate; The reflective layer is located between the color filter substrate and the privacy film, and the reflective layer is a reflective polarizer.

7. The display device according to claim 6, characterized in that, The reflective layer constitutes the upper polarizer of the display panel.

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