LED screen and optical rotation integrated black composite film for LED screen

Abstract

The LED screen comprises an LED screen body and an optical rotation integrated black composite film which is attached to the outer surface of the LED screen body and used for the LED screen, the optical rotation integrated black composite film used for the LED screen comprises an adhesive layer, a quarter-wave plate layer and a polaroid layer which are sequentially arranged in a stacked mode, and the adhesive layer is attached to the light emitting side of the LED screen body; the polaroid layer is used for converting ambient light into first linear polarized light when the ambient light is incident; the quarter-wave plate layer is used for converting the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when ambient light is incident; the left-hand circularly polarized light or the right-hand circularly polarized light is converted into reverse right-hand circularly polarized light or left-hand circularly polarized light when being reflected by the LED screen body; the reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into second linear polarized light by the quarter-wave plate layer when being emitted, and the second linear polarized light rotates by 90 degrees relative to the first linear polarized light and is blocked by the polaroid, so that the LED screen displays integrated black after being turned off.

Description

Technical Field

[0001] The present application relates to the field of optical technology, and in particular to an LED screen and an optically rotating integrated black composite film for the LED screen. Background Art

[0002] Currently, there are several ways to achieve the black effect of LED screens (such as outdoor LED screens):

[0003] 1. Silk screen printing

[0004] After the cover is CNC-coated, tempered, and silk-screened / evaporated with a black border, a layer of semi-transparent IR ink is printed on the window area or button area of the glass cover. By adjusting the ink color and transmittance, a one-piece black effect is achieved.

[0005] 2. Magnetron sputtering

[0006] Through magnetron sputtering and optical principles, an inorganic film is directly coated on the glass cover to adjust the reflection, transmittance and color difference of the film window area, so that the color of the touch screen window and the silk-screen border are consistent.

[0007] 3. The cover is made of semi-transparent material

[0008] By adding color powder to the resin material and adjusting the amount of color powder added to the material, an "integrated black" effect can be achieved; glass can be colored during production, or a dyeing process can be used.

[0009] 4. Use smoked OCA / OCR adhesive

[0010] However, the above methods are still not ideal, and the LED screen will appear grayish when it is turned off. Utility Model Content

[0011] The present application provides an LED screen and an optically rotating integrated black composite film for the LED screen to solve the technical problem in the background technology that the LED screen appears grayish white when it is turned off.

[0012] To solve the above technical problems, the present application adopts a technical solution: providing an LED screen, comprising an LED screen body and a black composite film for the LED screen that is bonded to the outer surface of the LED screen body. The black composite film for the LED screen comprises an adhesive layer, a quarter-wave plate layer, and a polarizer layer stacked in sequence. The adhesive layer is bonded to the light-emitting side of the LED screen body.

[0013] Ambient light passes through the polarizer layer and the quarter-wave plate layer and is incident on the surface of the LED screen body and reflected;

[0014] The polarizer layer is used to convert the ambient light into a first linear polarized light when the ambient light is incident;

[0015] The quarter wave plate layer is used to convert the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when the ambient light is incident;

[0016] The left-handed circularly polarized light or the right-handed circularly polarized light is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when it is reflected by the LED screen body;

[0017] The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into a second linear polarized light by the quarter-wave plate when it is emitted. The second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer so that the LED screen appears black after being turned off.

[0018] Preferably, the optically rotating integrated black composite film for the LED screen also includes a first outer film layer and a second outer film layer. The areas of the first outer film layer and the second outer film layer correspond to the areas of the quarter-wave plate layer and the polarizer layer, and are torn off when they are attached to the LED screen body.

[0019] Preferably, the thickness of the quarter-wave plate layer ranges from 1 um to 1000 um.

[0020] Preferably, the thickness of the polarizer layer ranges from 0.025 mm to 0.3 mm.

[0021] Preferably, the thickness of the adhesive layer is in the range of 15um to 500um.

[0022] To solve the above technical problems, the present application adopts a technical solution: providing a black composite film with optical rotation for LED screens, wherein the black composite film with optical rotation for LED screens comprises an adhesive layer, a quarter-wave plate layer, and a polarizer layer stacked in sequence, wherein the adhesive layer is laminated to the light-emitting side of the LED screen body; wherein:

[0023] Ambient light passes through the polarizer layer and the quarter-wave plate layer and is incident on the surface of the LED screen body and reflected;

[0024] The polarizer layer is used to convert the ambient light into a first linear polarized light when the ambient light is incident;

[0025] The quarter wave plate layer is used to convert the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when the ambient light is incident;

[0026] The left-handed circularly polarized light or the right-handed circularly polarized light passes through the surface of the LED screen body and is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when reflected;

[0027] The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into a second linear polarized light by the quarter-wave plate when it is emitted. The second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer so that the LED screen appears black after being turned off.

[0028] Preferably, the optically rotating integrated black composite film for the LED screen also includes a first outer film layer and a second outer film layer. The areas of the first outer film layer and the second outer film layer correspond to the areas of the quarter-wave plate layer, the polarizer layer, and the adhesive layer, and are torn off when they are attached to the LED screen body.

[0029] Preferably, the thickness of the quarter-wave plate layer ranges from 1 um to 1000 um.

[0030] Preferably, the thickness of the polarizer layer ranges from 0.025 mm to 0.3 mm.

[0031] Preferably, the thickness of the adhesive layer is in the range of 15um to 500um.

[0032] The beneficial effects of the present application are: the LED screen and the optically active integrated black composite film for the LED screen provided by the present application include an adhesive layer, a quarter-wave plate layer, and a polarizer layer stacked in sequence from the inside to the outside. When ambient light is incident, it is converted into a first linear polarization through the polarizer layer; then converted into left-handed circularly polarized light or right-handed circularly polarized light through the quarter-wave plate layer; when ambient light is emitted, it is reflected by the LED screen body and converted into reverse right-handed circularly polarized light or left-handed circularly polarized light; then converted into a second linear polarization through the quarter-wave plate and blocked by the polarizer layer so that the LED screen displays a better integrated black effect after the screen is turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without inventive efforts. Among them:

[0034] Figure 1 This is a schematic side view of a simplified layer structure of an LED screen provided in an embodiment of the present application;

[0035] Figure 2This is a side schematic diagram of the simplified layer structure of the integrated black composite film for LED screens provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 110. LED screen body; 210. First outer film layer; 220. Adhesive layer; 230. Quarter wave plate layer; 240. Polarizer layer; 250. Second outer film layer. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, and back infusion set injection parts with anti-pollution components), the directional indications are only used to explain the relative position relationship, movement, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0041] See also Figure 1 , Figure 1 This is a side schematic diagram of the simplified layer structure of the LED screen provided in an embodiment of the present application.

[0042] like Figure 1 As shown, an embodiment of the present application provides an LED screen, comprising an LED screen body 110 and a black composite film for the LED screen that is adhered to the outer surface of the LED screen body 110. The LED screen provided in this embodiment can be an indoor LED screen or an outdoor LED screen, and the specific size is not limited.

[0043] The optically active black composite film for LED screens includes an adhesive layer 220, a quarter-wave plate layer 230, and a polarizer layer 240, which are stacked in sequence. The quarter-wave plate layer 230 is attached to the light-emitting side of the LED screen body 110 (i.e., the outer surface of the LED screen body 110) via the adhesive layer 220. The thickness of the quarter-wave plate layer 230 can range from 1 μm to 1000 μm, the thickness of the polarizer layer 240 can range from 0.025 mm to 0.3 mm, and the thickness of the adhesive layer 220 can range from 15 μm to 500 μm.

[0044] The LED screen provided in this application can display a good integrated black effect after the screen is turned off. The principle is as follows:

[0045] The ambient light passes through the polarizer layer 240 and the quarter-wave plate layer 230 and is incident on the surface of the LED screen body 110 and reflected;

[0046] The polarizer layer 240 is used to convert ambient light into first linear polarized light when ambient light is incident;

[0047] The quarter wave plate layer 230 is used to convert the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when ambient light is incident;

[0048] The left-handed circularly polarized light or the right-handed circularly polarized light is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when it is reflected by the LED screen body 110;

[0049] The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into a second linear polarized light by the quarter-wave plate layer 230 when it is emitted. The second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer layer 240 so that the LED screen appears completely black after it is turned off.

[0050] That is to say, by sequentially adding a quarter-wave plate layer 230 and a polarizer layer 240 to the LED screen body 110, the ambient light can be sequentially converted into the first linear polarization, left-handed circularly polarized light or right-handed circularly polarized light when incident, and sequentially converted into the opposite right-handed circularly polarized light or left-handed circularly polarized light and the second linear polarization when reflected. The reflected second linear polarization cannot pass through the polarizer layer 240 because the angle does not match the polarizer layer 240, and is blocked by the polarizer layer 240 so that the LED screen displays a better integrated black state after the screen is turned off.

[0051] Please also refer to Figure 2 , Figure 2 This is a side schematic diagram of the simplified layer structure of the integrated black composite film for LED screens provided in an embodiment of the present application.

[0052] The optically active integrated black composite film for LED screens provided in the embodiment of the present application also includes a first outer film layer 210 provided on one side of the adhesive layer 220 and a second outer film layer 250 provided on one side of the quarter-wave plate layer 230. The areas of the first outer film layer 210 and the second outer film layer 250 correspond to the areas of the quarter-wave plate layer 230, the polarizer layer 240, and the adhesive layer 220, and are torn off when attached to the LED screen body 110. The first outer film layer 210 is a release film that is easy to tear off during installation and attachment, and the second outer film layer 250 is a protective film that is used to protect and prevent scratches on the polarizer layer 240. Handles can be provided on the first outer film layer 210 and the second outer film layer 250 as needed to further enhance the convenience of tearing off the first outer film layer 210 and the second outer film layer 250.

[0053] In the embodiment of the present application, the phase difference of the quarter-wave plate layer 230 is between 80 nm and 200 nm. Preferably, the phase difference of the quarter-wave plate layer 230 is between 100 nm and 150 nm. More preferably, the phase difference of the quarter-wave plate layer 230 is 140 nm. The quarter-wave plate layer 230 is made of a material having birefringence properties by coating or cast stretching. The material of the quarter-wave plate layer 230 is polycarbonate, cycloolefin polymer, modified cellulose acetate, or liquid crystal polymer.

[0054] In the embodiment of the present application, the polarizer layer 240 is composed of a polyvinyl alcohol film dyed with a dichroic dye and stretched, and protective layers on both sides of the polyvinyl alcohol film. The protective layers are films such as cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

[0055] In the embodiment of the present application, the adhesive layer 220 is made of a high-temperature and high-humidity pressure-sensitive adhesive. After the adhesive layer 220 and the LED screen are bonded together, bubbles are eliminated by heating and pressurizing.

[0056] like Figure 2 As shown, the embodiment of the present application also provides a black composite film for LED screens, which includes an adhesive layer 220, a quarter-wave plate layer 230, and a polarizer layer 240 stacked in sequence, wherein the adhesive layer 220 is used to be bonded to the light-emitting side of the LED screen body 110, that is, bonded to the outer surface side of the LED screen body 110.

[0057] The LED screen provided in this application can display a good integrated black effect after the screen is turned off. The principle is as follows:

[0058] The ambient light passes through the polarizer layer 240 and the quarter-wave plate layer 230 and is incident on the surface of the LED screen body 110 and reflected;

[0059] The polarizer layer 240 is used to convert ambient light into first linear polarized light when ambient light is incident;

[0060] The quarter wave plate layer 230 is used to convert the first linear polarization light into left-handed circular polarization light or right-handed circular polarization light when ambient light is incident;

[0061] The left-handed circularly polarized light or the right-handed circularly polarized light is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when it is reflected by the LED screen body 110;

[0062] The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted into a second linear polarized light by the quarter-wave plate layer 230 when it is emitted. The second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer layer 240 so that the LED screen displays a better integrated black state after the screen is turned off.

[0063] That is to say, by sequentially adding an adhesive layer 220, a quarter-wave plate layer 230, and a polarizer layer 240 to the LED screen body 110, the ambient light can be sequentially converted into the first linear polarization, left-handed circularly polarized light, or right-handed circularly polarized light when incident, and sequentially converted into the opposite right-handed circularly polarized light or left-handed circularly polarized light, and the second linear polarization when reflected. The reflected second linear polarization cannot pass through the polarizer layer 240 because the angle does not match the polarizer layer 240, and is blocked by the polarizer layer 240 so that the LED screen displays a better integrated black state after the screen is turned off.

[0064] As a product that can be sold independently, the optically active integrated black composite film for LED screens also includes a first outer film layer 210 and a second outer film layer 250. The areas of the first outer film layer 210 and the second outer film layer 250 correspond to the areas of the quarter-wave plate layer 230, the polarizer layer 240, and the adhesive layer 220, and are torn off when attached to the LED screen body 110. The first outer film layer 210 is a release film that is easy to tear off during installation and is used to protect and scratch the quarter-wave plate layer 230. The second outer film layer 250 is a protective film that is used to protect and scratch the polarizer layer 240. Handles can be provided on the first outer film layer 210 and the second outer film layer 250 as needed to further enhance the ease of tearing off the first outer film layer 210 and the second outer film layer 250.

[0065] The phase difference of the quarter-wave plate layer 230 is between 80 nm and 200 nm. Preferably, the phase difference of the quarter-wave plate layer 230 is between 100 nm and 150 nm. More preferably, the phase difference of the quarter-wave plate layer 230 is 140 nm. The quarter-wave plate layer 230 is made of a material having birefringence properties by coating or cast stretching. The material of the quarter-wave plate layer 230 is polycarbonate, cycloolefin polymer, modified cellulose acetate, or liquid crystal polymer. The thickness and width of the quarter-wave plate layer 230 are not specifically limited.

[0066] The polarizer layer 240 is composed of a polyvinyl alcohol film dyed with a dichroic dye and stretched, and protective layers on both sides of the polyvinyl alcohol film. The protective layers are made of cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer. The polarization efficiency of the polarizer layer 240 is greater than 70%, generally between 80-99.999%. The thickness can be adjusted according to the actual usage scenario.

[0067] The adhesive layer 220 can be made of a high-temperature and high-humidity pressure-sensitive adhesive. After the adhesive layer 220 and the LED screen body 110 are bonded together, bubbles are eliminated by applying heat and pressure.

[0068] In summary, it is easy for those skilled in the art to understand that the LED screen and the optically active integrated black composite film for the LED screen provided by the present application include an adhesive layer 220, a quarter-wave plate layer 230, and a polarizer layer 240 stacked in sequence from the inside to the outside. When ambient light is incident, it is converted into a first linear polarization through the polarizer layer 240; then it is converted into left-handed circularly polarized light or right-handed circularly polarized light through the quarter-wave plate layer 230; when ambient light is emitted, it is reflected by the LED screen body 110 and converted into reverse right-handed circularly polarized light or left-handed circularly polarized light; then it is converted into a second linear polarization through the quarter-wave plate and blocked by the polarizer layer 240 so that the LED screen displays a better integrated black effect after the screen is turned off.

[0069] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An LED screen, characterized by: The LED screen comprises an LED screen body (110) and a black composite film for an LED screen that is laminated to the outer surface of the LED screen body (110), wherein the black composite film for an LED screen comprises an adhesive layer (220), a quarter-wave plate layer (230), and a polarizer layer (240) that are laminated in sequence, and the adhesive layer (220) is laminated to the light-emitting side of the LED screen body (110); wherein: Ambient light passes through the polarizer layer (240) and the quarter-wave plate layer (230), is incident on the surface of the LED screen body (110), and is reflected; The polarizer layer (240) is used to convert the ambient light into first linear polarized light when the ambient light is incident; The quarter-wave plate layer (230) is used to convert the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when the ambient light is incident; The left-handed circularly polarized light or the right-handed circularly polarized light is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when reflected by the LED screen body (110); The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted by the quarter-wave plate layer (230) into a second linear polarized light when emitted, and the second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer so that the LED screen appears entirely black after the screen is turned off.

2. The LED screen according to claim 1, characterized in that: The optically rotating integrated black composite film for an LED screen further comprises a first outer film layer (210) and a second outer film layer (250), wherein the areas of the first outer film layer (210) and the second outer film layer (250) correspond to the areas of the quarter-wave plate layer (230) and the polarizer layer (240), and are torn off when being bonded to the LED screen body (110).

3. The LED screen according to claim 1, characterized in that: The thickness of the quarter-wave plate layer (230) ranges from 1 um to 1000 um.

4. The LED screen according to claim 1, characterized in that: The thickness of the polarizer layer (240) ranges from 0.025 mm to 0.3 mm.

5. The LED screen according to claim 1, characterized in that: The thickness of the adhesive layer (220) ranges from 15um to 500um.

6. A black composite film with optical rotation for LED screens, characterized by: The optically rotating integrated black composite film for an LED screen comprises an adhesive layer (220), a quarter-wave plate layer (230), and a polarizer layer (240) stacked in sequence, wherein the adhesive layer (220) is used to be laminated on the light-emitting side of the LED screen body (110); wherein: Ambient light passes through the polarizer layer (240) and the quarter-wave plate layer (230), is incident on the surface of the LED screen body (110), and is reflected; The polarizer layer (240) is used to convert the ambient light into first linear polarized light when the ambient light is incident; The quarter-wave plate layer (230) is used to convert the first linear polarized light into left-handed circularly polarized light or right-handed circularly polarized light when the ambient light is incident; The left-handed circularly polarized light or the right-handed circularly polarized light passes through the surface of the LED screen body (110) and is converted into the reverse right-handed circularly polarized light or the left-handed circularly polarized light when reflected; The reverse right-handed circularly polarized light or left-handed circularly polarized light is converted by the quarter-wave plate layer (230) into a second linear polarized light when emitted, and the second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizer so that the LED screen appears entirely black after the screen is turned off.

7. The optically active black composite film for LED screens according to claim 6, characterized in that: The optically rotating integrated black composite film for an LED screen further comprises a first outer film layer (210) and a second outer film layer (250), wherein the areas of the first outer film layer (210) and the second outer film layer (250) correspond to the areas of the quarter-wave plate layer (230), the polarizer layer (240), and the adhesive layer (220), and are torn off when attached to the LED screen body (110).

8. The optically active black composite film for LED screens according to claim 6, characterized in that: The thickness of the quarter-wave plate layer (230) ranges from 1 um to 1000 um.

9. The optically active black composite film for LED screens according to claim 6, characterized in that: The thickness of the polarizer layer (240) ranges from 0.025 mm to 0.3 mm.

10. The optically active black composite film for LED screens according to claim 6, characterized in that: The thickness of the adhesive layer (220) ranges from 15um to 500um.

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