Display screen and optical rotation integrated black composite film for display screen

Abstract

The invention relates to the technical field of optics, is used for solving the problem that display of a display screen is in a gray white shape when the screen is turned off, and provides a display screen which comprises a display layer, a touch layer / cover plate layer and an optical rotation integrated black composite film arranged between the display layer and the touch layer / cover plate layer and used for the display screen. The optical rotation integrated black composite film for the display screen comprises a quarter-wave plate layer, a polaroid layer and an adhesive layer which are sequentially arranged in a stacked mode, the quarter-wave plate layer is arranged on the light emitting side of a display layer in an attached mode, and the adhesive layer is arranged on the inner surface side of a touch layer / cover plate layer in an attached mode; ambient light is converted into first linear polarized light through the polaroid layer during incidence; the polarized light is converted into left-hand circularly polarized light or right-hand circularly polarized light through the quarter-wave plate layer; when the ambient light is emitted, the ambient light is reflected and converted into reverse right-handed circularly polarized light or left-handed circularly polarized light through the display layer; the second linear polarized light is converted into second linear polarized light through the quarter-wave plate layer and is blocked by the polaroid layer, so that the display screen displays integrated black after the screen is turned off.

Description

Technical Field

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

[0002] Many modern display products do not use a mouse, but a touch screen (TP, Touch panel). The refractive index of the material used for the touch screen is different from that of the material on the outer surface of the display screen. When external light is incident on the outer surface of the display screen, reflection will occur. The reflected light makes the color of the display area and the color of the ink printed on the outer circle of the entire touch screen obviously different, and it is impossible to achieve the effect of a black screen when the screen is turned off. In addition, the existence of reflected light also reduces the overall contrast and color vividness of the screen.

[0003] At present, the effect of one-piece black generally has the following ways: 1. Silk screen printing After the cover is CNC-ed, reinforced, and silk-screened / evaporated with a black frame, a layer of IR ink semi-transparent printing is done on the window area or button part of the glass cover. The integrated black effect is achieved by adjusting the ink color and transmittance.

[0004] 2. Magnetron sputtering 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 window area of ​​the film layer, so that the color of the touch screen window and the silk-screen border are consistent.

[0005] 3. The cover is made of semi-transparent material 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.

[0006] 4. Use smoked OCA / OCR adhesive to bond From the structure of the display screen, the effect of integrated black is the color consistency displayed by the light after passing through the cover plate, TP layer, LCM layer, and fully bonded optical glue. Therefore, in addition to the cover plate, TP, and LCM liquid crystal layer, the original transparent optical glue part can also be replaced with smoked OCA / OCR glue to adjust the color adjustment to reduce the color difference between the display part and the edge part.

[0007] However, the above methods are still not ideal, and the display screen will appear grayish when it is turned off. Summary of the invention

[0008] The present application provides a display screen and an integrated black composite film for the display screen, so as to solve the technical problem in the background technology that the display screen appears grayish white when the screen is turned off.

[0009] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide a display screen, the display screen comprises a display layer, a touch layer / cover plate layer, and an optically active integrated black composite film for the display screen arranged between the display layer and the touch layer / cover plate layer, the optically active integrated black composite film for the display screen comprises a quarter wave plate layer, a polarizing layer, and an adhesive layer stacked in sequence, the quarter wave plate layer is laminated on the light emitting side of the display layer, and the adhesive layer is laminated on the inner surface side of the touch layer / cover plate layer; wherein: Ambient light passes through the touch layer / cover layer, the polarizer layer, and the quarter-wave plate layer and is incident on the surface of the display layer and reflected; The polarizer layer is used for converting the ambient light into a 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 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 display layer; 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 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 so that the display screen appears completely black after the screen is turned off.

[0010] Preferably, in the display screen, the optically active integrated black composite film for the display screen also includes a first outer film layer provided on one side of the quarter wave plate layer and a second outer film layer provided on one side of the adhesive layer, and 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 being bonded to the display layer and the touch layer / cover layer.

[0011] Preferably, in the display screen, the phase difference value of the quarter wave plate layer is between 80nm-200nm, and it is made of a material with birefringence properties by coating or casting and stretching. The material of the quarter wave plate layer is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer.

[0012] Preferably, in the display screen, the polarizer layer 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, and the protective layers are cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

[0013] Preferably, in the display screen, the adhesive layer is made of a high temperature and high humidity resistant pressure sensitive adhesive, and after the adhesive layer and the touch layer / cover plate layer are bonded together, heating and pressurization are applied to eliminate bubbles after bonding.

[0014] In order to solve the above technical problems, a technical solution adopted by the present application is: to provide an optically active integrated black composite film for a display screen, wherein the optically active integrated black composite film for a display screen comprises a quarter-wave plate layer, a polarizing plate layer, and an adhesive layer stacked in sequence, wherein the quarter-wave plate layer is used to be bonded to the light-emitting side of the display layer of the display screen, and the adhesive layer is used to be bonded to the inner surface side of the touch layer / cover plate layer of the display screen; wherein: Ambient light passes through the touch layer / cover layer, the polarizer layer, and the quarter-wave plate layer and is incident on the surface of the display layer and reflected; The polarizer layer is used for converting the ambient light into a 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 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 it is reflected by the display layer; 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 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 so that the display screen appears completely black after the screen is turned off.

[0015] Preferably, in the optically active integrated black composite film for a display screen, the optically active integrated black composite film for a display screen further comprises 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 being bonded to the display layer and the touch layer / cover layer.

[0016] Preferably, in the optically active integrated black composite film for display screens, the phase difference value of the quarter-wave plate layer is between 80nm and 200nm, and the film is made of a material having birefringence properties by coating or cast stretching, and the material of the quarter-wave plate layer is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer.

[0017] Preferably, in the optically active integrated black composite film for display screens, the polarizer layer 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, and the protective layers are cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

[0018] Preferably, in the optically active integrated black composite film for display screens, the adhesive layer is made of a high temperature and high humidity resistant pressure sensitive adhesive, and after the adhesive layer and the touch layer / cover plate layer are bonded together, air bubbles are eliminated by heating and pressurizing.

[0019] The beneficial effects of the present application are as follows: the display screen and the integrated black composite film for the display screen provided by the present application include 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 display layer 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 layer and blocked by the polarizer layer so that the display screen displays a better integrated black effect after the screen is turned off. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them: Figure 1 is a schematic side view of a simplified layer structure of a display screen provided in an embodiment of the present application; Figure 2 It is a side schematic diagram of a simplified layer structure of an integrated black composite film for a display screen provided in an embodiment of the present application.

[0021] Description of reference numerals: 110, display layer; 120, touch layer / cover layer; 210, first outer film layer; 220, quarter wave plate layer; 230, polarizer layer; 240, adhesive layer; 250, second outer film layer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] It should be noted that if there are directional indications involved in the embodiments of the present application (such as up, down, left, right, front, and back injection parts of infusion sets with anti-pollution components), then 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.

[0024] 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 used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0025] See also Figure 1 , Figure 1 It is a side schematic diagram of the simplified layer structure of the display screen provided in an embodiment of the present application.

[0026] like Figure 1 As shown, the embodiment of the present application provides a display screen, which includes a display layer 110, a touch layer / cover layer 120, and an optically rotating integrated black composite film for the display screen disposed between the display layer 110 and the touch layer / cover layer 120. When the outermost layer of the display screen is the touch layer, the display screen is a touch-controlled display screen, and when the outermost layer of the display screen is the cover layer, the display screen is an ordinary display screen that can be viewed. As is known to all, most display screens are touch-controlled display screens, and the display screen described in this embodiment can be a central control display screen for a car.

[0027] The optically active integrated black composite film for the display screen includes a quarter wave plate layer 220, a polarizer layer 230, and an adhesive layer 240 which are sequentially stacked. The quarter wave plate layer 220 can be arranged on the light-emitting side of the display layer 110 by colloid bonding, and the adhesive layer 240 is bonded to the inner surface side of the touch layer / cover layer 120. The thickness of the quarter wave plate layer 220 can be 1um~1000um, the thickness of the polarizer layer 230 can be 0.025mm~0.3mm, and the thickness of the adhesive layer 240 can be 15um~500um.

[0028] The display screen provided in this application can display a better integrated black effect after the screen is turned off. The principle is as follows: The ambient light passes through the touch layer / cover layer 120, the polarizer layer 230, and the quarter-wave plate layer 220, and is incident on the surface of the display layer 110 and reflected; The polarizer layer 230 is used to convert ambient light into first linear polarized light when ambient light is incident; The quarter wave plate layer 220 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; 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 display layer 110; 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 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 230 so that the display screen appears completely black after the screen is turned off.

[0029] That is to say, by sequentially adding a quarter-wave plate layer 220 and a polarizer layer 230 to the display layer 110, the ambient light can be sequentially converted into a first linear polarized light, left-handed circularly polarized light or right-handed circularly polarized light when incident, and sequentially converted into reverse right-handed circularly polarized light or left-handed circularly polarized light and a second linear polarized light when reflected. The reflected second linear polarized light cannot pass through the polarizer layer 230 because the angle does not match the polarizer layer 230, and is blocked by the polarizer layer 230 so that the display screen appears in a better integrated black state after the screen is turned off.

[0030] Please also read Figure 2 , Figure 2 It is a side schematic diagram of a simplified layer structure of an integrated black composite film for a display screen provided in an embodiment of the present application.

[0031] The optically active integrated black composite film for display screens of the present application also includes a first outer film layer 210 disposed on one side of the quarter wave plate layer 220 and a second outer film layer 250 disposed on one side of the adhesive layer 240. 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 220, the polarizer layer 230, and the adhesive layer 240, and are torn off when they are attached to the display layer 110 and the touch layer / cover layer 120. The first outer film layer 210 is a protective film, which is used to protect and prevent scratches on the quarter wave plate layer 220. The second outer film layer 250 is a release film, which is easy to tear off when installing and attaching. The first outer film layer 210 and the second outer film layer 250 can be provided with a handle as needed to further improve the convenience of tearing off the first outer film layer 210 and the second outer film layer 250.

[0032] In the embodiment of the present application, the phase difference value of the quarter wave plate layer 220 is between 80nm and 200nm. Preferably, the phase difference value of the quarter wave plate layer 220 is between 100nm and 150nm. More preferably, the phase difference value of the quarter wave plate layer 220 is 140nm. The quarter wave plate layer 220 is made of a material having a birefringence property by coating or casting and stretching. The material of the quarter wave plate layer 220 is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer.

[0033] In the embodiment of the present application, the polarizer layer 230 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, and the protective layers are films such as triacetyl cellulose, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

[0034] In the embodiment of the present application, the adhesive layer 240 is made of a high temperature and high humidity resistant pressure sensitive adhesive. After the adhesive layer 240 and the touch layer / cover layer 120 are bonded together, the bubbles after bonding are eliminated by heating and pressurizing.

[0035] like Figure 2 As shown, the embodiment of the present application further provides a polarizing integrated black composite film for a display screen, the polarizing integrated black composite film for a display screen comprises a quarter wave plate layer 220, a polarizing layer 230, and an adhesive layer 240 which are sequentially stacked, wherein the quarter wave plate layer 220 is used to be bonded to the light emitting side of the display layer 110 of the display screen, and the adhesive layer 240 is used to be bonded to the inner surface side of the touch layer / cover layer 120 of the display screen. When the outermost layer of the display screen is the touch layer, the display screen is a touch-controlled display screen, and when the outermost layer of the display screen is the cover layer, the display screen is an ordinary display screen that can be viewed. As is known to all, most display screens are touch-controlled display screens. The display screen described in this embodiment can be a central control display screen of a car.

[0036] The display screen provided in this application can display a better integrated black effect after the screen is turned off. The principle is as follows: The ambient light passes through the touch layer / cover layer 120, the polarizer layer 230, and the quarter-wave plate layer 220, and is incident on the surface of the display layer 110 and reflected; The polarizer layer 230 is used to convert ambient light into first linear polarized light when ambient light is incident; The quarter wave plate layer 220 is used to convert the first linear polarization light into left-handed circular polarization light or right-handed circular polarization 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 it is reflected by the display layer 110; 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 220 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 230 so that the display screen displays a better integrated black state after the screen is turned off.

[0037] That is to say, the quarter-wave plate layer 220 and the polarizer layer 230 can convert the ambient light into the first linear polarization, left-handed circular polarization or right-handed circular polarization in sequence when incident, and convert it into the opposite right-handed circular polarization or left-handed circular polarization and the second linear polarization in sequence when reflected. The reflected second linear polarization cannot pass through the polarizer layer 230 because the angle does not match the polarizer layer 230, and is blocked by the polarizer layer 230 so that the display screen displays a better integrated black state after the screen is turned off.

[0038] As a product that can be sold independently, the optically active integrated black composite film for display 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 220, the polarizer layer 230, and the adhesive layer 240, and are torn off when they are attached to the display layer 110 and the touch layer / cover layer 120. The first outer film layer 210 is a protective film, which is used to protect and prevent scratches on the quarter wave plate layer 220. The second outer film layer 250 is a release film, which is easy to tear off when installing and attaching. The first outer film layer 210 and the second outer film layer 250 can be provided with a handle as needed to further improve the convenience of tearing off the first outer film layer 210 and the second outer film layer 250.

[0039] The phase difference value of the quarter wave plate layer 220 is between 80nm and 200nm. Preferably, the phase difference value of the quarter wave plate layer 220 is between 100nm and 150nm. More preferably, the phase difference value of the quarter wave plate layer 220 is 140nm. The quarter wave plate layer 220 is made of a material having birefringence properties by coating or casting and stretching. The material of the quarter wave plate layer 220 is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer, etc. The thickness and width of the quarter wave plate layer 220 are not specifically limited.

[0040] The polarizer layer 230 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 cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer. The polarization efficiency of the polarizer layer 230 is greater than 70%, generally 80-99.999%, and the thickness can be adjusted according to the actual usage scenario.

[0041] The adhesive layer 240 may be made of a high temperature and high humidity resistant pressure sensitive adhesive. After the adhesive layer 240 and the touch layer / cover layer 120 are bonded together, air bubbles are eliminated by heating and pressurizing.

[0042] In summary, it is easy for those skilled in the art to understand that the display screen and the integrated black composite film for the display screen provided by the present application include a quarter-wave plate layer 220 and a polarizer layer 230 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 230; then converted into left-handed circularly polarized light or right-handed circularly polarized light through the quarter-wave plate layer 220; when ambient light is emitted, it is reflected by the display layer 110 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 layer 220 and blocked by the polarizer layer 230 so that the display screen displays a better integrated black effect after the screen is turned off.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A display screen, characterized in that: The display screen comprises a display layer (110), a touch layer / cover plate layer (120), and an optically active integrated black composite film for the display screen arranged between the display layer (110) and the touch layer / cover plate layer (120); the optically active integrated black composite film for the display screen comprises a quarter wave plate layer (220), a polarizing layer (230), and an adhesive layer (240) which are sequentially stacked; the quarter wave plate layer (220) is laminated on the light emitting side of the display layer (110), and the adhesive layer (240) is laminated on the inner surface side of the touch layer / cover plate layer (120); wherein: Ambient light passes through the touch layer / cover layer (120), the polarizer layer (230), and the quarter-wave plate layer (220), is incident on the surface of the display layer (110), and is reflected; The polarizer layer (230) is used to convert the ambient light into first linear polarized light when the ambient light is incident; The quarter wave plate layer (220) is used for converting 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 opposite right-handed circularly polarized light or the left-handed circularly polarized light when reflected by the display layer (110); 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 when emitted, the second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizing plate layer (230) so that the display screen appears completely black after the screen is turned off.

2. The display screen according to claim 1, characterized in that: The optically active integrated black composite film for a display screen further comprises a first outer film layer (210) arranged on one side of the quarter wave plate layer (220) and a second outer film layer (250) arranged on one side of the adhesive layer (240); 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 (220), the polarizer layer (230), and the adhesive layer (240), and are torn off when being bonded to the display layer (110) and the touch layer / cover plate layer (120).

3. The display screen according to claim 1, characterized in that: The phase difference value of the quarter wave plate layer (220) is between 80nm and 200nm, and is made of a material having a birefringence property by coating or casting and stretching. The material of the quarter wave plate layer (220) is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer.

4. The display screen according to claim 1, characterized in that: The polarizer layer (230) is composed of a polyvinyl alcohol film that has been dyed with a dichroic dye and stretched, and protective layers on both sides of the polyvinyl alcohol film, wherein the protective layers are cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

5. The display screen according to claim 1, characterized in that: The adhesive layer (240) is made of a high temperature and high humidity resistant pressure sensitive adhesive. After the adhesive layer (240) and the touch layer / cover layer (120) are bonded together, air bubbles are eliminated by heating and pressurizing.

6. A black composite film with optical rotation for display screens, characterized in that: The optically active integrated black composite film for a display screen comprises a quarter wave plate layer (220), a polarizing plate layer (230), and an adhesive layer (240) which are stacked in sequence, the quarter wave plate layer (220) being used to be bonded to the light emitting side of a display layer (110) of the display screen, and the adhesive layer (240) being used to be bonded to the inner surface side of a touch layer / cover plate layer (120) of the display screen; wherein: Ambient light passes through the touch layer / cover layer (120), the polarizer layer (230), and the quarter-wave plate layer (220), is incident on the surface of the display layer (110), and is reflected; The polarizer layer (230) is used to convert the ambient light into first linear polarized light when the ambient light is incident; The quarter wave plate layer (220) is used for converting 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 opposite right-handed circularly polarized light or the left-handed circularly polarized light when reflected by the display layer (110); 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 when emitted, and the second linear polarized light is rotated 90 degrees relative to the first linear polarized light and is blocked by the polarizing plate layer (230) so that the display screen appears completely black after the screen is turned off.

7. The optically active integrated black composite film for display screens according to claim 6, characterized in that: The optically active integrated black composite film for a display screen further comprises 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 (220), the polarizer layer (230), and the adhesive layer (240), and are torn off when being bonded to the display layer (110) and the touch layer / cover plate layer (120).

8. The optically active integrated black composite film for display screens according to claim 6, characterized in that: The phase difference value of the quarter wave plate layer (220) is between 80nm and 200nm, and is made of a material having a birefringence property by coating or casting and stretching. The material of the quarter wave plate layer (220) is polycarbonate, cycloolefin polymer, modified cellulose acetate or liquid crystal polymer.

9. The optically active integrated black composite film for display screens according to claim 6, characterized in that: The polarizer layer (230) is composed of a polyvinyl alcohol film that has been dyed with a dichroic dye and stretched, and protective layers on both sides of the polyvinyl alcohol film, wherein the protective layers are cellulose triacetate, polymethyl methacrylate, polyethylene terephthalate or cycloolefin polymer.

10. The optically active integrated black composite film for display screens according to claim 6, characterized in that: The adhesive layer (240) is made of a high temperature and high humidity resistant pressure sensitive adhesive, and after the adhesive layer (240) and the touch layer / cover layer (120) are bonded together, air bubbles are eliminated by heating and pressurizing.

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