Brightness enhancement film, electronic equipment and processing method

Abstract

The invention discloses a brightness enhancement film, electronic equipment and a processing method, and belongs to the technical field of liquid crystal display. The processing method is suitable for the electronic equipment, the electronic equipment comprises the brightness enhancement film, and the brightness enhancement film is used for being stacked on the light emitting side of a display screen. The brightness enhancement film comprises a polarization layer, a phase difference layer and a cholesteric liquid crystal reflecting layer which are sequentially arranged in a stacked mode, the polarization layer is bonded with the phase difference layer, and the phase difference layer is bonded with the cholesteric liquid crystal reflecting layer. An included angle is formed between the polarization direction of the polarization layer and the slow axis of the phase difference layer, so that incident light is converted into circularly polarized light through the polarization layer and the phase difference layer; the cholesteric liquid crystal reflecting layer is used for being arranged towards the display screen and bonded to the display screen, the cholesteric liquid crystal reflecting layer is provided with an open hole, the open hole corresponds to a non-display area of the display screen, and the open hole is filled with transparent glue. By adopting the brightness enhancement film, the brightness of the non-display area is relatively low, so that the screen-off integrated black effect of the electronic equipment is relatively good.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of liquid crystal display, and particularly relates to a brightness enhancement film, an electronic device and a processing method. BACKGROUND

[0002] With the continuous development of display technology, the organic light emitting diode (OLED) display technology has been widely applied in electronic devices due to its self-luminous, high contrast and low power consumption and many other advantages.

[0003] In the OLED display technology, in order to improve the display brightness, a brightness enhancement film is usually arranged on the light-emitting side of the display screen. However, in actual application, since the non-display area of the display screen is not provided with a light shielding layer, and the brightness enhancement film is arranged, the part of the electronic device corresponding to the non-display area has a relatively high reflectivity, thereby causing the non-display area to have a relatively high brightness. In the screen-off state of the electronic device, the brightness makes the camera and sensor and other electronic devices in the non-display area clearly visible, thereby causing the screen-off all-black effect of the electronic device to be poor. SUMMARY

[0004] The purpose of the embodiments of the application is to provide a brightness enhancement film, an electronic device and a processing method, which can solve the problem of poor screen-off all-black effect of the electronic device in the related art.

[0005] In a first aspect, the embodiments of the application provide a brightness enhancement film, which is used to be stacked on the light-emitting side of a display screen, and comprises: a polarizing layer, a phase difference layer and a cholesteric liquid crystal reflection layer which are sequentially stacked, and the polarizing layer is bonded to the phase difference layer, and the phase difference layer is bonded to the cholesteric liquid crystal reflection layer.

[0006] The polarization direction of the polarizing layer is arranged at an angle with the slow axis of the phase difference layer, so as to convert incident light into circularly polarized light through the polarizing layer and the phase difference layer.

[0007] The cholesteric liquid crystal reflection layer is arranged towards the display screen and is bonded to the display screen, the cholesteric liquid crystal reflection layer is provided with an opening, the opening corresponds to the non-display area of the display screen, and the opening is filled with transparent adhesive.

[0008] In a second aspect, the embodiments of the application provide an electronic device, which comprises a display screen and the aforementioned brightness enhancement film, the brightness enhancement film is stacked on the light-emitting side of the display screen, the cholesteric liquid crystal reflection layer is arranged towards the display screen and is bonded to the display screen, and the opening of the cholesteric liquid crystal reflection layer is arranged opposite to the non-display area of the display screen.

[0009] In a third aspect, the embodiments of the present application provide a processing method, which is suitable for the electronic device described above, and the processing method comprises the following steps:

[0010] The polarizing layer and the phase difference layer are stacked and bonded;

[0011] The cholesteric liquid crystal reflective layer with the opening is stacked on the light-emitting side of the display screen, and the cholesteric liquid crystal reflective layer is bonded to the display screen;

[0012] The bonded polarizing layer and the phase difference layer are stacked on the side of the cholesteric liquid crystal reflective layer away from the display screen, and the phase difference layer is bonded to the cholesteric liquid crystal reflective layer.

[0013] In the embodiments of the present application, the cholesteric liquid crystal reflective layer is provided with an opening, and the opening corresponds to the non-display area of the display screen, and the opening is filled with transparent adhesive. In this arrangement, in the non-display area of the display screen, the incident light, i.e. ambient light, forms circularly polarized light after sequentially passing through the polarizing layer and the phase difference layer, and then the circularly polarized light is emitted to the non-display area through the area corresponding to the opening, and after being reflected by the electronic device in the non-display area, circularly polarized light with opposite handedness to the previous circularly polarized light is obtained. The circularly polarized light serves as the outgoing light, and the outgoing light again passes through the area corresponding to the opening in the opposite direction, and sequentially passes through the phase difference layer and the polarizing layer. After the outgoing light passes through the phase difference layer, linearly polarized light is obtained, and the optical axis of the linearly polarized light is perpendicular to the polarization direction of the polarizing layer. In this state, the outgoing light cannot pass through the polarizing layer, which reduces the brightness of the non-display area of the display screen, thereby improving the screen-off integrated black effect of the electronic device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Part of the structure of the electronic device disclosed in the embodiments of the present application is shown in the schematic diagram;

[0015] Figure 2 The structure of the brightness enhancement film disclosed in one of the embodiments of the present application is shown in the schematic diagram;

[0016] Figure 3 The processing flowchart of the cholesteric liquid crystal reflective layer of the brightness enhancement film disclosed in the embodiments of the present application is shown in the schematic diagram; Figure 2 The processing flowchart of the cholesteric liquid crystal reflective layer of the brightness enhancement film disclosed in the embodiments of the present application is shown in the schematic diagram;

[0017] Figure 4 The structure of the brightness enhancement film disclosed in another embodiment of the present application is shown in the schematic diagram;

[0018] Figure 5 The processing flowchart of the cholesteric liquid crystal reflective layer of the brightness enhancement film disclosed in the embodiments of the present application is shown in the schematic diagram; Figure 4 The processing flowchart of the cholesteric liquid crystal reflective layer of the brightness enhancement film disclosed in the embodiments of the present application is shown in the schematic diagram;

[0019] Figure 6A schematic diagram of a setting mode of the first protective layer and the second protective layer disclosed in the embodiments of the present application;

[0020] Figure 7 One of the processing flowcharts of the electronic device disclosed in the embodiments of the present application;

[0021] Figure 8 The second processing flowchart of the electronic device disclosed in the embodiments of the present application;

[0022] Figure 9 A schematic diagram of a part of the structure of the electronic device disclosed in the related art.

[0023] Explanation of reference signs:

[0024] 100-composite layer, 110-polarizing layer, 120-phase difference layer, 130-optical compensation layer, 140-first protective layer;

[0025] 200-cholesteric liquid crystal reflection layer, 210-aperture, 211-transparent adhesive, 220-sublayer, 220a-first sublayer, 220b-second sublayer, 220c-third sublayer, 230-substrate layer, 230a-first substrate layer, 230b-second substrate layer, 230c-third substrate layer, 240-alignment layer, 240a-first alignment layer, 240b-second alignment layer, 240c-third alignment layer;

[0026] 300-display screen, 310-light shielding layer, 320-non-display area;

[0027] 410-first adhesive layer, 420-second adhesive layer, 430-third adhesive layer, 440-fourth adhesive layer;

[0028] 510-second protective layer, 520-third protective layer;

[0029] 610-first circularly polarized light, 620-second circularly polarized light, 630-third circularly polarized light, 640-fourth circularly polarized light, 650-seventh circularly polarized light, 660-eighth circularly polarized light. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0031] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects before and after are in an "or" relationship.

[0032] The brightness enhancement film, electronic device and processing method provided by the embodiments of the present application will be described in detail below with reference to the specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0033] Please refer to Figures 1 to 8 As shown in the figure, the present application provides a brightness enhancement film, which is used to be stacked on the light-emitting side of the display screen 300. The brightness enhancement film comprises a polarizing layer 110, a phase difference layer 120 and a cholesteric liquid crystal reflection layer 200 which are sequentially stacked, and the polarizing layer 110 is bonded to the phase difference layer 120, and the phase difference layer 120 is bonded to the cholesteric liquid crystal reflection layer 200.

[0034] The polarization direction of the polarizing layer 110 is arranged at an angle with the slow axis of the phase difference layer 120, so as to convert the incident light into circularly polarized light through the polarizing layer 110 and the phase difference layer 120, and the incident light is ambient light.

[0035] The cholesteric liquid crystal reflection layer 200 is arranged towards the display screen 300 and is bonded to the display screen 300. The cholesteric liquid crystal reflection layer 200 is provided with an opening 210, and the opening 210 corresponds to the non-display area 320 of the display screen 300, and the opening 210 is filled with transparent adhesive 211.

[0036] Optionally, the liquid crystal type of the cholesteric liquid crystal reflection layer 200 is, for example, cholesteric rod-like liquid crystal, and the cholesteric rod-like liquid crystal is, for example, horizontally spiral oriented. The non-display area 320 of the display screen 300 refers to, for example, the hole-punching area or the groove area of the display screen 300, and the non-display area 320 is provided with electronic devices such as cameras or sensors. The electronic devices can be equivalent to a metal reflection layer with a certain reflectivity.

[0037] In the related art, the cholesteric liquid crystal reflection layer 200 of the brightness enhancement film is not provided with an opening 210, as shown in the figure Figure 9As shown, after being arranged in this way, in the non-display area 320 of the display screen 300, the incident light rays form circularly polarized light after sequentially passing through the polarizing layer 110 and the phase difference layer 120, and this circularly polarized light is defined as first circularly polarized light 610. Then the first circularly polarized light 610 is reflected by the cholesteric liquid crystal reflective layer 200 towards the non-display area 320, and after being reflected by the electronic devices in the non-display area 320, the second circularly polarized light 620 opposite in handedness to the first circularly polarized light 610 is obtained. Then the second circularly polarized light 620 continues to be reflected in the cholesteric liquid crystal reflective layer 200, and the handedness of the reflected second circularly polarized light 620 does not change. After this reflection, the third circularly polarized light 630 is obtained, which is reflected again by the electronic devices in the non-display area 320, and the fourth circularly polarized light 640 opposite in handedness to the third circularly polarized light 630 is obtained. At the same time, the fourth circularly polarized light is the same in handedness as the first circularly polarized light 610. Then the fourth circularly polarized light serves as the outgoing light rays, which sequentially pass through the cholesteric liquid crystal reflective layer 200 and the phase difference layer 120. After passing through the phase difference layer 120, the outgoing light rays are converted into linearly polarized light, and the polarization direction of the linearly polarized light is consistent with the polarization direction of the polarizing layer 110. In this way, the outgoing light rays can pass through the polarizing layer 110 and be emitted to the outside. In this way, the arrangement of the brightness enhancement film in the related art causes the electronic device to have a high reflectivity corresponding to the part of the non-display area 320, so that the non-display area 320 has a high brightness, and thus the screen-off integrated black effect of the electronic device is poor.

[0038] While the above Figure 1 As shown, in the embodiment of the present application, the cholesteric liquid crystal reflective layer 200 is provided with an opening 210 corresponding to the non-display area 320 of the display screen 300, and the opening 210 is filled with transparent glue 211. In this arrangement, in the non-display area 320 of the display screen 300, the incident light rays form circularly polarized light after sequentially passing through the polarizing layer 110 and the phase difference layer 120. Then the circularly polarized light passes through the area corresponding to the opening 210 and is emitted to the non-display area 320. After being reflected by the electronic devices in the non-display area 320, circularly polarized light opposite in handedness to the previous circularly polarized light is obtained. This circularly polarized light serves as the outgoing light rays, which pass through the area corresponding to the opening 210 again along the opposite direction, and sequentially pass through the phase difference layer 120 and the polarizing layer 110. After the outgoing light rays pass through the phase difference layer 120, linearly polarized light is obtained, and the optical axis of the linearly polarized light is perpendicular to the polarization direction of the polarizing layer 110. In this state, the outgoing light rays cannot pass through the polarizing layer 110, which reduces the brightness of the non-display area 320 of the display screen 300, and thus improves the screen-off integrated black effect of the electronic device.

[0039] It should be noted that, compared with the brightness enhancement film provided in the embodiments of the present application, the brightness enhancement film in the related art is provided with the cholesteric liquid crystal reflection layer 200 corresponding to the position of the non-display area 320, and the existence of the cholesteric liquid crystal reflection layer 200 makes most of the ambient light re-emerge from the brightness enhancement film after entering the brightness enhancement film, thereby causing the non-display area 320 to have a higher brightness. The brightness enhancement film provided in the embodiments of the present application is provided with the opening 210 corresponding to the position of the non-display area 320, and does not have the cholesteric liquid crystal reflection layer 200, and due to the lack of the reflection effect of the cholesteric liquid crystal reflection layer 200, most of the ambient light cannot re-emerge from the brightness enhancement film after entering the brightness enhancement film, thereby reducing the brightness of the non-display area 320 and improving the screen-off integrated black effect of the electronic device.

[0040] It should also be noted that, Figure 1 and Figure 9 The hollow arrows in the above figures all indicate the transmission path of the light.

[0041] In another embodiment, as shown in Figure 1 , the brightness enhancement film further includes an optical compensation layer 130, the optical compensation layer 130 is stacked between the phase difference layer 120 and the cholesteric liquid crystal reflection layer 200, and the optical compensation layer 130 is used to compensate the phase difference of the emergent light.

[0042] In actual application, the optical compensation layer 130 basically does not work at the normal viewing angle, that is, in the case that the line of sight of the user is perpendicular to the display surface of the display screen 300.

[0043] And at the oblique viewing angle, the optical compensation layer 130 can compensate the phase difference of the emergent light, so that the optical axis of the linearly polarized light obtained after the emergent light passes through the phase difference layer 120 is perpendicular to the polarization direction of the polarizing layer 110 at the oblique viewing angle, thereby improving the screen-off integrated black effect of the electronic device at the oblique viewing angle.

[0044] Optionally, the liquid crystal type of the optical compensation layer 130 is, for example, a vertically aligned rod-shaped liquid crystal, and the liquid crystal director is, for example, uniformly vertically aligned along the thickness direction of the optical compensation layer 130. The thickness direction of the optical compensation layer 130 is the same as the thickness direction of the brightness enhancement film, and the thickness direction of the brightness enhancement film is, for example, the direction indicated by the arrow line A in Figure 1 .

[0045] In addition, in actual use, the ambient light, after passing through the polarizing layer 110 and the phase difference layer 120, becomes the fifth circularly polarized light, the optical compensation layer 130 does not change the rotation direction of the circularly polarized light, the sixth circularly polarized light has the same rotation direction as the seventh circularly polarized light 650, the sixth circularly polarized light, after passing through the opening 210, becomes the seventh circularly polarized light 650, the transparent adhesive 211 in the opening 210 does not change the rotation direction of the circularly polarized light, the seventh circularly polarized light 650 has the same rotation direction as the sixth circularly polarized light, then the seventh circularly polarized light 650 is incident on the non-display area 320, and after being reflected by the electronic device in the non-display area 320, the eighth circularly polarized light 660 is formed, the rotation direction of the eighth circularly polarized light 660 is opposite to that of the seventh circularly polarized light 650, and the eighth circularly polarized light 660, as the outgoing light, passes through the optical compensation layer 130 and the phase difference layer 120 in sequence. In addition, the eighth circularly polarized light 660, after passing through the phase difference layer 120, becomes linearly polarized light, and the optical axis of the linearly polarized light is perpendicular to the polarization direction of the polarizing layer 110, so that the polarizing layer 110 can block the linearly polarized light from being emitted.

[0046] Specifically, the fifth circularly polarized light, the sixth circularly polarized light, and the seventh circularly polarized light 650 are, for example, right-handed circularly polarized light, and the eighth circularly polarized light 660 is, for example, left-handed circularly polarized light.

[0047] It should also be noted that the display screen 300 includes a display area and the non-display area 320 mentioned above, and the display area is provided with the light-blocking layer 310, and the non-display area 320 is not provided with the light-blocking layer 310. The light-blocking layer 310 is, for example, a black rectangular layer. Due to the presence of the light-blocking layer 310, the reflectivity of the electronic device corresponding to the display area of the display screen 300 is low, so that in the screen-off state, the part has a better dark state effect. Figure 1

[0048] In other embodiments, the brightness enhancement film can also not include the optical compensation layer 130.

[0049] In another embodiment, the angle between the polarization direction of the polarizing layer 110 and the slow axis of the phase difference layer 120 is 45 degrees or 135 degrees. In this arrangement, the color image of the electronic device in each direction is more balanced, thereby providing a better visual effect for the user.

[0050] In other embodiments, the angle between the polarization direction of the polarizing layer 110 and the slow axis of the phase difference layer 120 can also be other angles, as long as the angle is greater than or equal to 0 degrees and less than or equal to 180 degrees.

[0051] In another embodiment, referring to Figures 2 to 5 ​As shown, the cholesteric liquid crystal reflective layer 200 includes at least one sub-layer 220. When the cholesteric liquid crystal reflective layer 200 includes at least two sub-layers 220, the sub-layers 220 are stacked, and the operating wavelength bands of the at least two sub-layers 220 are different.

[0052] When the cholesteric liquid crystal reflective layer 200 includes only one sub-layer 220, the structure of the cholesteric liquid crystal reflective layer 200 is simple, the processing difficulty is low, and the cost is low. When the cholesteric liquid crystal reflective layer 200 includes at least two sub-layers 220, and the operating wavelength bands of the at least two sub-layers 220 are different, different sub-layers 220 can meet different reflection requirements, which widens the reflection range of the cholesteric liquid crystal reflective layer 200, thereby improving the brightness enhancement effect of the brightness enhancement film.

[0053] In further embodiments, referring to Figures 2 to 5 As shown, the cholesteric liquid crystal reflective layer 200 includes at least three sub-layers 220, and the operating wavelength bands of the three sub-layers 220 are red, green, and blue, respectively.

[0054] By setting the operating wavelength bands of the three sub-layers 220 as red, green, and blue, respectively, the cholesteric liquid crystal reflective layer 200 can cover the red spectrum, the green spectrum, and the blue spectrum. Red, green, and blue are the three primary colors of light. In this way, the cholesteric liquid crystal reflective layer 200 can cover the visible spectrum, which makes the brightness enhancement effect of the brightness enhancement film better.

[0055] Specifically, the birefringence of the liquid crystal of the cholesteric liquid crystal reflective layer 200 at a wavelength of 550 nm is 0.1-0.2. The central value of the red wavelength band is, for example, 600-640 nm, the central value of the green wavelength band is, for example, 510-550 nm, the central value of the blue wavelength band is, for example, 440-480 nm, and the thickness of the sub-layer 220 is, for example, 1-2 μm. The thickness direction of the sub-layer 220 is the same as the thickness direction of the brightness enhancement film.

[0056] In other embodiments, the cholesteric liquid crystal reflective layer 200 can cover only one or two of the red spectrum, the green spectrum, and the blue spectrum.

[0057] In the embodiments of the present application, an electronic device is also provided, which includes a display screen 300 and the brightness enhancement film described above. The brightness enhancement film is stacked on the light-emitting side of the display screen 300, the cholesteric liquid crystal reflective layer 200 is arranged towards the display screen 300 and is bonded to the display screen 300, and the opening 210 of the cholesteric liquid crystal reflective layer 200 is arranged opposite the non-display area 320 of the display screen 300. The electronic device has the same beneficial effects as the brightness enhancement film described above, and will not be described here again.

[0058] refer to Figure 7 and Figure 8 As shown, this application embodiment also provides a processing method, which is applicable to the electronic device described above. The processing method includes the following steps:

[0059] S100, the polarizing layer 110 and the phase difference layer 120 are stacked and bonded together.

[0060] S200, a cholesteric liquid crystal reflective layer 200 with apertures 210 is stacked on the light-emitting side of the display screen 300, and the cholesteric liquid crystal reflective layer 200 is bonded to the display screen 300.

[0061] S300, the polarizing layer 110 and the phase retardation layer 120 are stacked on the side of the cholesteric liquid crystal reflective layer 200 away from the display screen 300, and the phase retardation layer 120 is bonded to the cholesteric liquid crystal reflective layer 200.

[0062] In this embodiment, the cholesteric liquid crystal reflective layer 200 is first processed with an opening 210, and then connected to the phase retardation layer 120 and the polarizing layer 110. In this way, the processing of the opening 210 will not affect the phase retardation layer 120 and the polarizing layer 110, thereby improving the processing quality of the brightness enhancement film and helping to extend the service life of the brightness enhancement film.

[0063] In other embodiments, the opening 210 may be processed on the cholesteric liquid crystal reflective layer 200 after the phase difference layer 120 is connected to the cholesteric liquid crystal reflective layer 200.

[0064] It should be noted that the order of steps S100 and S200 can be interchanged, and can be selected according to actual processing needs.

[0065] In a further embodiment, reference is made to... Figure 1 As shown, the brightness enhancement film also includes an optical compensation layer 130.

[0066] Accordingly, the processing method also includes the following steps:

[0067] S310, the optical compensation layer 130 is stacked and bonded to the side of the phase difference layer 120 away from the polarization layer 110.

[0068] S320, the phase-bonded polarizing layer 110, phase difference layer 120 and optical compensation layer 130 are stacked on the side of the cholesteric liquid crystal reflective layer 200 away from the display screen 300, and the optical compensation layer 130 is bonded to the cholesteric liquid crystal reflective layer 200.

[0069] In the embodiment, the brightness enhancement film further comprises an optical compensation layer 130. As described above, the optical compensation layer 130 can compensate the phase difference of the outgoing light at the oblique viewing angle, so that the optical axis of the linearly polarized light obtained after the outgoing light passes through the phase difference layer 120 is perpendicular to the polarization direction of the polarizing layer 110 at the oblique viewing angle, thereby improving the screen-off integrated black effect of the electronic device at the oblique viewing angle.

[0070] In other embodiments, the brightness enhancement film can not comprise the optical compensation layer 130, and correspondingly, the processing method can not comprise the steps S310 and S320.

[0071] In further embodiments, the processing method further comprises the following steps:

[0072] S311, after the optical compensation layer 130 and the phase difference layer 120 are bonded, a first protective layer 140 is releasably arranged on the side of the polarizing layer 110 away from the phase difference layer 120, and a second protective layer 510 is releasably arranged on the side of the optical compensation layer 130 away from the phase difference layer 120.

[0073] By adopting the scheme of the embodiment, the first protective layer 140 can protect the phase difference layer 120, so that the phase difference layer 120 is less disturbed by the outside. Similarly, the second protective layer 510 can protect the optical compensation layer 130, so that the optical compensation layer 130 is less disturbed by the outside.

[0074] In actual processing, first, the polarizing layer 110, the phase difference layer 120 and the optical compensation layer 130 are bonded to form a whole, and then, for example, the first protective layer 140 and the second protective layer 510 are bonded on the whole to prevent the polarizing layer 110 and the optical compensation layer 130 from being disturbed by the outside. On this basis, when the optical compensation layer 130 needs to be bonded to the cholesteric liquid crystal reflection layer 200, the second protective layer 510 needs to be removed first. Similarly, the first protective layer 140 needs to be removed before the user uses the electronic device, so as to prevent the first protective layer 140 from interfering with the work of the polarizing layer 110.

[0075] Specifically, the second protective layer 510 is, for example, a release film layer, and the second protective layer 510 is releasably bonded to the optical compensation layer 130 through a first adhesive layer 410, which is, for example, a pressure sensitive (PSA) adhesive layer.

[0076] In addition, the polarizing layer 110 and the phase difference layer 120, and the phase difference layer 120 and the optical compensation layer 130 are bonded through a second adhesive layer 420, which is, for example, an ultraviolet (UV) adhesive layer.

[0077] In other embodiments, the first protective layer 140 can also not be provided on the side of the polarizing layer 110 facing away from the phase difference layer 120. Similarly, the second protective layer 510 can also not be provided on the side of the optical compensation layer 130 facing away from the phase difference layer 120.

[0078] In another embodiment, referring to Fig. 2, the cholesteric liquid crystal reflective layer 200 includes at least two sub-layers 220, each of which is stacked and has a different working wavelength range. Figures 2 to 6

[0079] Correspondingly, the processing method further includes the following steps:

[0080] S210, an alignment layer 240 is provided on each of the at least two substrate layers 230, and a peelable sub-layer 220 is provided on each of the alignment layers 240, and the bonding force between different sub-layers 220 and alignment layers 240 is different.

[0081] S220, in order of the bonding force from small to large, the corresponding alignment layer 240 and substrate layer 230 are sequentially peeled off, and the corresponding sub-layer 220 is sequentially bonded.

[0082] In this embodiment, the cholesteric liquid crystal reflective layer 200 includes at least two sub-layers 220, each of which is stacked and has a different working wavelength range. As described above, in this arrangement, different sub-layers 220 can meet different reflection requirements, which widens the reflection range of the cholesteric liquid crystal reflective layer 200, thereby improving the brightness of the brightness enhancement film.

[0083] In addition, in this embodiment, the bonding force between different sub-layers 220 and alignment layers 240 is different, and in order of the bonding force from small to large, the corresponding alignment layer 240 and substrate layer 230 are sequentially peeled off, and the corresponding sub-layer 220 is sequentially bonded. In this arrangement, each time the peeling operation is performed, the alignment layer 240 and the substrate layer 230 corresponding to the smallest bonding force are peeled off. In this way, when the corresponding matching layer and the substrate layer 230 are peeled off, other sub-layers 220 and the corresponding alignment layer 240 and substrate layer 230 will not be separated, thereby reducing the processing difficulty of the cholesteric liquid crystal reflective layer 200.

[0084] ​Specifically, two adjacent sub-layers 220 are bonded by a third adhesive layer 430, for example, which is also a photosensitive adhesive, for example, and the thickness of the third adhesive layer 430 is in the range of 1-3 μm, more specifically, for example, 2 μm, and the thickness direction of the third adhesive layer 430 is the same as the thickness direction of the brightness enhancement film. The substrate layer 230 is, for example, a polyethylene terephthalate (PET) layer or a triacetyl cellulose (TAC) layer, and the thickness of the substrate layer 230 is in the range of 60-100 μm, and the thickness direction of the substrate layer 230 is the same as the thickness direction of the brightness enhancement film.

[0085] In actual processing, each sub-layer 220 corresponds to a different substrate layer 230 and a different alignment layer 240, and the substrate layer 230, the alignment layer 240, and the sub-layer 220 correspond one-to-one. Specifically, taking the processing of one of the sub-layers 220 as an example, first, the alignment layer 240 is provided on the substrate layer 230, and then the corresponding processing operation is performed on the alignment layer 240, thereby obtaining the required sub-layer 220.

[0086] It should be noted that the substrate layer 230 and the alignment layer 240 are mainly used for processing the sub-layer 220, and when the at least two sub-layers 220 are assembled to form the cholesteric liquid crystal reflective layer 200, the substrate layer 230 and the alignment layer 240 need to be removed first.

[0087] In addition, when processing the cholesteric liquid crystal reflective layer 200, for example, the substrate layer 230 and the alignment layer 240 corresponding to the maximum bonding force are retained to protect the corresponding sub-layer 220, and when the cholesteric liquid crystal reflective layer 200 is bonded with the optical compensation layer 130, the previously retained alignment layer 240 and substrate layer 230 are removed.

[0088] In other embodiments, the bonding force between different sub-layers 220 and the alignment layer 240 can also be equal.

[0089] The following three specific examples and two specific comparative examples are used to introduce the brightness enhancement film provided in the embodiments of the present application in detail:

[0090] Example 1:

[0091] The number of sub-layers 220 is two, and the two sub-layers 220 are a first sub-layer 220a and a second sub-layer 220b, and the bonding force between the first sub-layer 220a and the corresponding alignment layer 240 is, for example, less than 5 gf, and the bonding force between the second sub-layer 220b and the corresponding alignment layer 240 is in the range of 5-10 gf.

[0092] Reference Figure 3As shown, in actual processing, for example, the first sub-layer 220a and the second sub-layer 220b are first bonded by the third adhesive layer 430, and the corresponding alignment layer 240 and the substrate layer 230 of the first sub-layer 220a are peeled off, and then the fourth adhesive layer 440 and the third protective layer 520 are sequentially stacked on the side of the first sub-layer 220a away from the second sub-layer 220b. After the above process is completed, the overall structure formed by the above process is cut to the target size, and the opening 210 is formed at the corresponding position of the overall structure, thereby obtaining the required cholesteric liquid crystal reflection layer 200. In addition, referring to Figure 7 and Figure 8 As shown, when the brightness enhancement film including the cholesteric liquid crystal reflection layer 200 is assembled to the light-emitting side of the display screen 300, for example, the third protective layer 520 in the foregoing is first peeled off, and the first sub-layer 220a is bonded to the display screen 300 by the fourth adhesive layer 440 in the foregoing, then the corresponding alignment layer 240 and the substrate layer 230 of the second sub-layer 220b and the second protective layer 510 in the foregoing are peeled off, and the optical compensation layer 130, the phase difference layer 120, the polarizing layer 110 and the first protective layer 140 are bonded to the side of the second sub-layer 220b away from the first sub-layer 220a by the first adhesive layer 410 in the foregoing, thereby completing the assembly of the brightness enhancement film. Specifically, the overall structure formed by the polarizing layer 110, the phase difference layer 120, the optical compensation layer 130 and the first protective layer 140 is defined as the composite layer 100.

[0093] Optionally, the fourth adhesive layer 440 is, for example, a PSA adhesive layer, and the thickness of the fourth adhesive layer 440 is, for example, in the range of 12-18 um, and specifically, for example, 15 um.

[0094] Example Two:

[0095] The difference between this embodiment and Example One is that in this embodiment, the number of sub-layers 220 is three, in addition to the first sub-layer 220a and the second sub-layer 220b in the foregoing, the third sub-layer 220c is also included in the embodiment of the present application, and the bonding force between the third sub-layer 220c and the corresponding alignment layer 240 is, for example, in the range of 15-20 gf.

[0096] In the actual processing, the first sub-layer 220a and the second sub-layer 220b are first bonded by the third adhesive layer 430, and the corresponding alignment layer 240 and the substrate layer 230 of the first sub-layer 220a are peeled off. Then, the third sub-layer 220c is bonded on the side of the first sub-layer 220a away from the second sub-layer 220b. After that, the corresponding alignment layer 240 and the substrate layer 230 of the second sub-layer 220b are peeled off, and the fourth adhesive layer 440 and the third protective layer 520 are sequentially stacked on the side of the second sub-layer 220b away from the first sub-layer 220a. After the above process is completed, the whole structure formed by the above process is cut into a target size, and an opening 210 is formed at a corresponding position of the whole structure, thereby obtaining the required cholesteric liquid crystal reflective layer 200. In addition, when the brightness enhancement film including the cholesteric liquid crystal reflective layer 200 is assembled to the light-emitting side of the display screen 300, for example, the third protective layer 520 in the foregoing is first peeled off, and the first sub-layer 220a is bonded to the display screen 300 by the fourth adhesive layer 440 in the foregoing. Then, the corresponding alignment layer 240 and the substrate layer 230 of the third sub-layer 220c and the second protective layer 510 in the foregoing are peeled off, and the composite layer 100 in the foregoing is bonded to the side of the third sub-layer 220c away from the first sub-layer 220a by the first adhesive layer 410 in the foregoing, thereby completing the assembly of the brightness enhancement film.

[0097] Specifically, for convenience of distinction, the alignment layer 240 corresponding to the first sub-layer 220a is, for example, the first alignment layer 240a, the alignment layer 240 corresponding to the second sub-layer 220b is, for example, the second alignment layer 240b, the alignment layer 240 corresponding to the third sub-layer 220c is, for example, the third alignment layer 240c, the substrate layer 230 corresponding to the first sub-layer 220a is, for example, the first substrate layer 230a, the substrate layer 230 corresponding to the second sub-layer 220b is, for example, the second substrate layer 230b, and the substrate layer 230 corresponding to the third sub-layer 220c is, for example, the third substrate layer 230c.

[0098] It should be noted that when the number of sub-layers 220 is greater than three, that is, the cholesteric liquid crystal reflective layer 200 further includes a first sub-layer 220a, a second sub-layer 220b, and a third sub-layer 220c, and other sub-layers 220, specifically, for example, a fourth sub-layer, and the binding force corresponding to the fourth sub-layer is greater than the binding force corresponding to the third sub-layer 220c, after peeling off the alignment layer 240 and the substrate layer 230 corresponding to the second sub-layer 220b, for example, a fourth sub-layer is bonded on the side of the second sub-layer 220b away from the first sub-layer 220a, then the alignment layer 240 and the substrate layer 230 corresponding to the third sub-layer 220c are peeled off, and the fourth adhesive layer 440 and the third protective layer 520 are sequentially stacked on the side of the third sub-layer 220c away from the first sub-layer 220a. After the above process is completed, the entire structure formed by the above process is cut to the target size, and an opening 210 is provided at the corresponding position of the entire structure, and the corresponding cholesteric liquid crystal reflective layer 200 is obtained. When the cholesteric liquid crystal reflective layer 200 includes a fourth sub-layer and other sub-layers 220, the processing method of the cholesteric liquid crystal reflective layer 200 is substantially the same as the method, which will not be described here.

[0099] Comparative Example 1:

[0100] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, the binding force between the first sub-layer 220a and the corresponding alignment layer 240 is equal to the binding force between the second sub-layer 220b and the corresponding matching layer, and the process of providing the opening 210 is omitted in Comparative Example 1, that is, the cholesteric liquid crystal reflective layer 200 does not provide the opening 210.

[0101] Comparative Example 2:

[0102] The difference between Comparative Example 2 and Example 2 is that in Comparative Example 2, the binding force between the first sub-layer 220a and the corresponding alignment layer 240, the binding force between the second sub-layer 220b and the corresponding matching layer, and the binding force between the third sub-layer 220c and the corresponding matching layer are equal, and the process of providing the opening 210 is also omitted in Comparative Example 2.

[0103] It is found that the reflectivity of the electronic device in Comparative Example 1 and Comparative Example 2 corresponding to the portion of the non-display area 320 of the display screen 300 is in the range of 35% to 40%, while the reflectivity of the electronic device in Example 1 and Example 2 corresponding to the portion of the non-display area 320 of the display screen 300 is about 7%, and the reflectivity of the electronic device in Comparative Example 1, Comparative Example 2, Example 1 and Example 2 corresponding to the portion of the display area of the display screen 300 is in the range of about 5% to 6%. It can be seen that the reflectivity of the electronic device in Example 1 and Example 2 corresponding to the portion of the non-display area 320 of the display screen 300 is significantly lower, and the reflectivity of the portion is less different from the reflectivity of the portion of the electronic device corresponding to the display area of the display screen 300. In this way, the screen-off integrated black effect of the electronic device provided in Example 1 and Example 2 is better.

[0104] It should be further noted that the first adhesive layer 410 corresponds to the transparent adhesive 211 filled in the opening 210, and part of the first adhesive layer 410 is embedded in the opening 210, so that the opening 210 is filled with the transparent adhesive 211.

[0105] As a specific implementation, the number of the sub-layers 220 can also be only one.

[0106] By using the scheme provided in this implementation, in the actual processing process, for example, the fourth adhesive layer 440 and the third protective layer 520 are sequentially stacked on the side of the first sub-layer 220a away from the alignment layer 240. After the above process is completed, the whole structure formed by the above process is cut to the target size, and the opening 210 is formed at the corresponding position of the whole structure, so as to obtain the required cholesteric liquid crystal reflection layer 200. In addition, when the brightness enhancement film including the cholesteric liquid crystal reflection layer 200 is assembled to the light-emitting side of the display screen 300, for example, the third protective layer 520 in the foregoing is first peeled off, and the sub-layer 220 is bonded to the display screen 300 through the fourth adhesive layer 440 in the foregoing, then the alignment layer 240 and the substrate layer 230 corresponding to the sub-layer 220 and the second protective layer 510 in the foregoing are peeled off, and the composite layer 100 in the foregoing is bonded to the side of the sub-layer 220 away from the fourth adhesive layer 440 through the first adhesive layer 410 in the foregoing, so as to complete the assembly of the brightness enhancement film.

[0107] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not limiting, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A brightness enhancement film for being stacked on the light exit side of a display screen (300), characterized in that, The brightness enhancement film comprises a polarizing layer (110), a phase difference layer (120) and a cholesteric liquid crystal reflection layer (200) which are sequentially stacked, and the polarizing layer (110) and the phase difference layer (120) are bonded, the phase difference layer (120) and the cholesteric liquid crystal reflection layer (200) are bonded; The polarization direction of the polarizing layer (110) is arranged at an angle with the slow axis of the phase difference layer (120) to convert incident light into circularly polarized light through the polarizing layer (110) and the phase difference layer (120); The cholesteric liquid crystal reflection layer (200) is arranged towards the display screen (300) and bonded to the display screen (300), the cholesteric liquid crystal reflection layer (200) is provided with an opening (210), the opening (210) corresponds to the non-display area (320) of the display screen (300), and the opening (210) is filled with transparent adhesive (211).

2. The brightness enhancement film of claim 1, wherein, The brightness enhancement film further comprises an optical compensation layer (130) which is stacked between the phase difference layer (120) and the cholesteric liquid crystal reflection layer (200), and the optical compensation layer (130) is used to compensate the phase difference of the outgoing light.

3. The brightness enhancement film of claim 1, wherein, The angle between the polarization direction of the polarizing layer (110) and the slow axis of the phase difference layer (120) is 45 degrees or 135 degrees.

4. The brightness enhancement film of claim 1, wherein, The cholesteric liquid crystal reflection layer (200) comprises at least one sub-layer (220); When the cholesteric liquid crystal reflection layer (200) comprises at least two sub-layers (220), each sub-layer (220) is stacked, and the working wave bands of the at least two sub-layers (220) are different.

5. The brightness enhancement film of claim 4, wherein, The cholesteric liquid crystal reflection layer (200) comprises at least three sub-layers (220), and the working wave bands of the three sub-layers (220) are red wave band, green wave band and blue wave band respectively.

6. An electronic device, comprising: The brightness enhancement film comprises a display screen (300) and the brightness enhancement film of any one of claims 1-5, the brightness enhancement film is stacked on the light-emitting side of the display screen (300), the cholesteric liquid crystal reflection layer (200) is arranged towards the display screen (300) and bonded to the display screen (300), and the opening (210) of the cholesteric liquid crystal reflection layer (200) is arranged opposite to the non-display area (320) of the display screen (300).

7. A processing method suitable for use in the electronic device of claim 6, characterized by The processing method comprises the following steps: The polarizing layer (110) and the phase difference layer (120) are stacked and bonded; The cholesteric liquid crystal reflection layer (200) with the opening (210) is stacked on the light-emitting side of the display screen (300), and the cholesteric liquid crystal reflection layer (200) is bonded to the display screen (300); The bonded polarizing layer (110) and the phase difference layer (120) are stacked on the side of the cholesteric liquid crystal reflection layer (200) away from the display screen (300), and the phase difference layer (120) is bonded to the cholesteric liquid crystal reflection layer (200).

8. The method of claim 7, wherein, The brightness enhancement film further comprises an optical compensation layer (130); The processing method further comprises the following steps: stacking and bonding the optical compensation layer (130) to the side of the phase difference layer (120) away from the polarizing layer (110); stacking the bonded polarizing layer (110), the phase difference layer (120) and the optical compensation layer (130) on the side of the cholesteric liquid crystal reflective layer (200) away from the display screen (300), and bonding the optical compensation layer (130) to the cholesteric liquid crystal reflective layer (200).

9. The method of claim 8, wherein, The processing method further comprises the following steps: After the optical compensation layer (130) and the phase difference layer (120) are bonded, a first protective layer (140) is releasably arranged on the side of the polarizing layer (110) away from the phase difference layer (120), and a second protective layer (510) is releasably arranged on the side of the optical compensation layer (130) away from the phase difference layer (120).

10. The method of claim 7, wherein, The cholesteric liquid crystal reflective layer (200) comprises at least two sub-layers (220), each of the sub-layers (220) is arranged in a stack, and the operating wave bands of the at least two sub-layers (220) are different; The processing method further comprises the following steps: An alignment layer (240) is arranged on each of the at least two substrate layers (230), and a releasable sub-layer (220) is arranged on each of the alignment layers (240), and the binding forces between different sub-layers (220) and the alignment layers (240) are different; In order of binding force from small to large, the corresponding alignment layer (240) and the substrate layer (230) are sequentially peeled off, and the corresponding sub-layer (220) is sequentially bonded.

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