Composite wide-viewing-angle optical film and liquid crystal display device comprising same

Abstract

The invention provides a composite wide-viewing-angle optical film and a liquid crystal display device comprising the same, and relates to the technical field of optical films. The composite wide-viewing-angle optical film comprises a first transparent base material layer and a second transparent base material layer, the first transparent base material layer is provided with a first optical surface and a second optical surface, the first optical surface is provided with a wide-viewing-angle structural layer, and the second optical surface is provided with a diffusion layer; the second transparent substrate layer is provided with a third optical surface and a fourth optical surface, a prism structure layer is arranged on the third optical surface, and an anti-scraping layer is arranged on the fourth optical surface; and a bonding layer is formed between the wide-viewing-angle structural layer on the first optical surface and the prism structural layer on the third optical surface. According to the composite wide-viewing-angle optical film, the wide-viewing-angle layer and the brightening layer are integrated into a single optical film, the overall thickness of the film can be reduced, and the wide viewing angle of the film can be achieved while the high brightness of the film is kept.

Description

Technical Field

[0001] The present invention relates to the technical field of optical films, and in particular to a composite wide-viewing angle optical film and a liquid crystal display device comprising the same. Background Art

[0002] With the continuous innovation and development of display technology, the application of liquid crystal displays is becoming more and more extensive. Since liquid crystal display devices (LCDs) can achieve high-definition and large-size screens, and have the advantages of small size and light weight compared to cathode ray tube (CRT) type display devices, liquid crystal display devices are widely used in household display appliances and display devices in public places.

[0003] However, LCDs usually have the best display brightness when the direction is perpendicular to the display screen. The further away from the normal line, the worse the display brightness effect, that is, the viewing angle of the LCD is narrow. In order to expand the viewing angle of the LCD, the commonly used solution is to attach an optical film with a wide viewing angle function to the LCD panel to change the light output direction after passing through the LCD panel, so that the output light of the LCD panel is evenly diffused, so that the display brightness and picture quality seen by users from all angles are relatively consistent.

[0004] However, the current solution of laminating an optical film with a wide viewing angle function on a liquid crystal display panel has various disadvantages. Cost: The wide viewing angle film is usually made of specific materials and has high production technology requirements, which leads to its high cost, increases the manufacturing cost of the liquid crystal panel, and thus affects the market competitiveness and selling price of the product. Display effect: Due to the increase in haze, the screen will appear foggy after the film is applied, making the image display not clear and thorough, reducing the contrast and sharpness of the picture, and affecting the visual experience; the microstructure of the wide viewing angle film makes the screen display granular, which is more obvious when displaying pure color or light color pictures, affecting the fineness of the picture. Process difficulty: Laminating the wide viewing angle film requires high-precision laminating technology and equipment to ensure that the film is tightly attached to the liquid crystal panel and has no defects such as bubbles and wrinkles, otherwise it will affect the display effect, increase the process difficulty and defect rate in the production process, and increase the production cost and production cycle. Stability: There may be differences in the physical properties such as the thermal expansion coefficient of the wide viewing angle film and the liquid crystal panel. Under different temperature environments, the expansion or contraction degree of the two is different, which can easily cause the film layer to fall off, warp or produce stress concentration, affecting the normal use and life of the liquid crystal panel.

[0005] In summary, the technical solution of bonding wide-viewing angle film to liquid crystal panel has many defects, which limits the application of such products.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The first object of the present invention is to provide a composite wide-viewing angle optical film, which integrates a wide-viewing angle layer and a brightness enhancement layer into a single optical film, which can not only reduce the overall thickness of the film, but also achieve a wide viewing angle of the film while achieving high brightness of the film.

[0008] A second object of the present invention is to provide a liquid crystal display device, comprising the composite wide-viewing angle optical film.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0010] The present invention provides a composite wide-viewing angle optical film, which comprises a first transparent substrate layer and a second transparent substrate layer, wherein:

[0011] The first transparent substrate layer has a first optical surface and a second optical surface, the first optical surface is provided with a wide viewing angle structure layer, the second optical surface is an opposite surface of the first optical surface, and the second optical surface is provided with a diffusion layer;

[0012] The second transparent substrate layer has a third optical surface and a fourth optical surface, the third optical surface is provided with a prism structure layer, the fourth optical surface is an opposite surface of the third optical surface, and the fourth optical surface is provided with an anti-scratch layer;

[0013] The wide-viewing angle structural layer on the first optical surface is bonded and compounded with the prism structural layer on the third optical surface, and an adhesive layer is formed between the wide-viewing angle structural layer on the first optical surface and the prism structural layer on the third optical surface.

[0014] Furthermore, the wide viewing angle structural layer is composed of a plurality of trapezoidal structures, and the trapezoidal structures are isosceles trapezoidal structures.

[0015] Furthermore, the prism structure layer is composed of a plurality of micro-prism structures, and the micro-prism structure is an isosceles right triangle structure.

[0016] Furthermore, the first transparent substrate layer is composed of a high molecular polymer resin;

[0017] Furthermore, the second transparent substrate layer is composed of a high molecular polymer resin;

[0018] Furthermore, the high molecular polymer resin includes at least one of polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride, and polypropylene.

[0019] Furthermore, the wide viewing angle structural layer is composed of ultraviolet light curing resin;

[0020] Furthermore, the prism structure layer is composed of ultraviolet light curing resin;

[0021] Furthermore, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin;

[0022] More preferably, the refractive index of the liquid state of the UV-curable resin is 1.35-1.70.

[0023] Further, the adhesive layer is composed of ultraviolet light curing resin;

[0024] Furthermore, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin;

[0025] More preferably, the refractive index of the liquid state of the UV-curable resin is 1.35-1.55.

[0026] Furthermore, the diffusion layer is mainly obtained by coating and curing a hydroxy acrylic polyol copolymer solution, and the haze of the diffusion layer is 5 to 80%;

[0027] Furthermore, the anti-scratch layer is mainly obtained by coating and curing a hydroxyl acrylic polyol copolymer solution, and the haze of the diffusion layer is 3-10%.

[0028] Furthermore, the hydroxy acrylic polyol copolymer solution comprises: a hydroxy acrylic polyol copolymer, a curing agent, an auxiliary agent, organic particles and a diluent;

[0029] Preferably, the hydroxy acrylic polyol copolymer solution comprises, by weight, 15 to 35 parts of hydroxy acrylic polyol copolymer, 5 to 10 parts of curing agent, 0.1 to 1.0 parts of auxiliary agent, 0.1 to 1.0 parts of organic particles and 50 to 80 parts of diluent.

[0030] Furthermore, the thickness of the first transparent substrate layer is 50-500um;

[0031] The thickness of the wide viewing angle structural layer is 50-60 um;

[0032] The thickness of the diffusion layer is 5 to 10 um;

[0033] The thickness of the second transparent substrate layer is 50-500um;

[0034] The thickness of the prism structure layer is 25 to 35 um;

[0035] The thickness of the anti-scratch layer is 5 to 10 um;

[0036] The thickness of the adhesive layer is 0.2-2 um.

[0037] The present invention provides a liquid crystal display device, the liquid crystal display device comprising the above composite wide-viewing angle optical film;

[0038] The liquid crystal display device is arranged in order from bottom to top including a diffusion plate, a composite wide-viewing angle optical film and a liquid crystal panel.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] The composite wide-viewing angle optical film of the present application includes a first transparent substrate layer and a second transparent substrate layer, wherein: the first transparent substrate layer has a first optical surface and a second optical surface, a wide-viewing angle structural layer is arranged on the first optical surface, the second optical surface is the opposite side of the first optical surface, and a diffusion layer is arranged on the second optical surface; the second transparent substrate layer has a third optical surface and a fourth optical surface, a prism structural layer is arranged on the third optical surface, the fourth optical surface is the opposite side of the third optical surface, and an anti-scratch layer is arranged on the fourth optical surface; the wide-viewing angle structural layer on the first optical surface is adhesively composited with the prism structural layer on the third optical surface, and an adhesive layer is formed between the wide-viewing angle structural layer on the first optical surface and the prism structural layer on the third optical surface. The composite wide-viewing angle optical film integrates the wide-viewing angle layer and the brightness enhancement layer into a single optical film. This design can not only reduce the overall thickness of the film, but also achieve a wide viewing angle of the film while maintaining high brightness.

[0041] Furthermore, the wide-viewing angle structural layer described in the present application is composed of a plurality of trapezoidal structures, and the prism structural layer is composed of a plurality of micro-prism structures. The composite wide-viewing angle optical film of the present application can maintain the emission angle and brightness of the light beam after passing through each micro-structure in the center of the display screen through the structural matching design of the above-mentioned trapezoidal structure and prism structure, and can change the light distribution after the light beam passes through the two sides of the display screen, and can increase the brightness of the liquid crystal display device in the middle while increasing the brightness of the liquid crystal display device on both sides, thereby solving the problem of narrow viewing angle of the liquid crystal display device and further improving the overall uniformity of the liquid crystal display device screen.

[0042] The liquid crystal display device provided by the present invention comprises a diffusion plate, the composite wide-viewing angle optical film of the present invention and a liquid crystal panel arranged in order from bottom to top. Determined by the performance of the composite wide-viewing angle optical film of the present invention, the liquid crystal display device can maintain a wide viewing angle while maintaining brightness gain, thereby effectively solving the problem of graininess of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the structure of a composite wide-viewing angle optical film provided in Example 1 of the present invention;

[0045] Figure 2 A cross-sectional view of a trapezoidal structure of a wide viewing angle structural layer provided in Example 1 of the present invention;

[0046] Figure 3 A cross-sectional view of a micro-prism structure of a prism structure layer provided in Example 1 of the present invention;

[0047] Figure 4 A schematic diagram of the structure of a liquid crystal display device prepared from the composite wide-viewing angle optical film of Example 1 provided in Experimental Example 1 of the present invention;

[0048] Figure 5 The control group 1 provided in the experimental example 1 of the present invention is a schematic diagram of the structure of a conventional liquid crystal display device with a wide viewing angle film function.

[0049] Icon: 100-diffusion plate; 200-lower brightness enhancement film; 300-upper brightness enhancement film; 400-liquid crystal panel; 500-wide-viewing angle film; 600-composite wide-viewing angle optical film; 601-first transparent substrate layer; 602-second transparent substrate layer; 6011-wide-viewing angle structural layer; 6012-diffusion layer; 6021-prismatic structural layer; 6022-anti-scratch layer; 603-adhesive layer. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] According to one aspect of the present invention, a composite wide-viewing angle optical film 600 is provided, wherein the composite wide-viewing angle optical film 600 comprises a first transparent substrate layer 601 and a second transparent substrate layer 602, wherein:

[0052] The first transparent substrate layer 601 has a first optical surface and a second optical surface, the first optical surface is provided with a wide viewing angle structure layer 6011, the second optical surface is an opposite surface of the first optical surface, and the second optical surface is provided with a diffusion layer 6012;

[0053] The second transparent substrate layer 602 has a third optical surface and a fourth optical surface, the third optical surface is provided with a prism structure layer 6021, the fourth optical surface is an opposite surface of the third optical surface, and the fourth optical surface is provided with an anti-scratch layer 6022;

[0054] The wide-viewing angle structure layer 6011 on the first optical surface is bonded and compounded with the prismatic structure layer 6021 on the third optical surface, and an adhesive layer 603 is formed between the wide-viewing angle structure layer 6011 on the first optical surface and the prismatic structure layer 6021 on the third optical surface.

[0055] The composite wide-viewing angle optical film 600 provided by the present invention comprises a first transparent substrate layer 601 and a second transparent substrate layer 602, wherein: the first transparent substrate layer 601 has a first optical surface and a second optical surface, a wide-viewing angle structural layer 6011 is arranged on the first optical surface, the second optical surface is a surface opposite to the first optical surface, and a diffusion layer 6012 is arranged on the second optical surface; the second transparent substrate layer 602 has a third optical surface and a fourth optical surface, a prism structural layer 6021 is arranged on the third optical surface, the fourth optical surface is a surface opposite to the third optical surface, and an anti-scratch layer 6022 is arranged on the fourth optical surface; the wide-viewing angle structural layer 6011 on the first optical surface and the prism structural layer 6021 on the third optical surface are bonded and composited, and an adhesive layer 603 is formed between the wide-viewing angle structural layer 6011 on the first optical surface and the prism structural layer 6021 on the third optical surface. The composite wide-viewing angle optical film 600 of the present application integrates the wide-viewing angle layer and the brightness enhancement layer into a single optical film. This design can not only reduce the overall thickness of the diaphragm, but also achieve a wide viewing angle of the diaphragm while maintaining high brightness.

[0056] In a preferred embodiment of the present invention, the wide viewing angle structure layer 6011 is composed of a plurality of trapezoidal structures, and the trapezoidal structures are isosceles trapezoidal structures.

[0057] The prism structure layer 6021 is composed of a plurality of micro-prism structures, and the micro-prism structure is an isosceles right triangle structure.

[0058] As a preferred embodiment, the present application can increase the brightness of the light source module through the micro-prism structure design of the prism structure layer 6021; at the same time, the multiple trapezoidal structures of the wide-viewing angle structure layer 6011 can change the light emission direction, thereby achieving the effect of improving the overall viewing angle of the picture. In addition, through the above-mentioned setting, the present invention can increase the brightness of the light source module on both sides while still maintaining the average brightness of the central area of ​​the picture. Therefore, the average brightness of the entire picture area can also be increased, thereby further improving the efficiency of the light source module.

[0059] It should be noted that when the composite wide-viewing angle optical film 600 of the present invention is used, light is incident from the anti-scratch layer 6022 into the second transparent substrate layer 602, and after passing through the second transparent substrate layer, the light is incident on the prism structure layer 6021 at an incident angle between 0 and 160 degrees. The prism structure layer 6021 concentrates the light incident on the prism layer within a range of 0 to 70 degrees after the first correction of internal refraction and total reflection, and then the emitted light enters the wide-viewing angle structure layer 6011 through the adhesive layer 603. The light incident on the wide-viewing angle structure layer 6011 is corrected by the second refraction of the trapezoidal structure layer and then emitted. The light enters the first transparent substrate layer 601, passes through the first transparent substrate layer 601 and then enters the diffusion layer 6012, and finally the light is emitted through the diffusion layer 6012. Then, through the structural combination design of the trapezoidal structure and the prism structure, the light beam can maintain the exit angle and brightness after passing through each microstructure in the center of the display screen, and at the same time, the light distribution after the light beam passes through the two sides of the display screen can be changed, and the brightness in the middle of the liquid crystal display device can be increased while the brightness of the liquid crystal display device on both sides can be increased, thereby solving the problem of narrow viewing angle of the liquid crystal display device and further improving the overall uniformity of the liquid crystal display device.

[0060] It should be noted that the present invention does not limit the number of micro-prism structures on the prism structure layer 6021. Those skilled in the art can adjust the number of micro-prism structures according to the design requirements of their actual products and with reference to the teachings of the embodiments of the present invention. The present invention does not limit the number of trapezoidal structures on the wide-viewing angle structure layer 6011. Those skilled in the art can adjust the number of trapezoidal structures according to the design requirements of their actual products and with reference to the teachings of the embodiments of the present invention.

[0061] Preferably, the cross section of the wide viewing angle structure layer 6011 is a plurality of isosceles trapezoidal structures, and the cross section of the prism structure layer 6021 is a plurality of isosceles right triangle structures.

[0062] In a preferred embodiment of the present invention, the first transparent substrate layer 601 and the second transparent substrate layer 602 are made of the same material, and are both composed of high molecular polymer resin.

[0063] In the above preferred embodiment, the high molecular polymer resin includes at least one of polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride, and polypropylene.

[0064] In a preferred embodiment of the present invention, the wide viewing angle structure layer 6011 and the prism structure layer 6021 are made of the same material, both of which are composed of ultraviolet light curing resin;

[0065] In the above preferred embodiment, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin;

[0066] In the above preferred embodiment, the refractive index of the liquid state resin of the ultraviolet curable resin constituting the wide viewing angle structure layer 6011 and the prism structure layer 6021 is 1.35-1.70.

[0067] In a preferred embodiment of the present invention, the adhesive layer 603 is composed of ultraviolet light curing resin;

[0068] In the above preferred embodiment, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin;

[0069] In the above preferred embodiment, the refractive index of the liquid state resin of the UV-curable resin constituting the adhesive layer 603 is 1.35-1.55.

[0070] In a preferred embodiment of the present invention, the diffusion layer 6012 is mainly obtained by coating and curing a hydroxy acrylic acid polyol copolymer solution, and the haze of the diffusion layer 6012 is 5 to 80%;

[0071] In a preferred embodiment of the present invention, the anti-scratch layer 6022 is mainly obtained by coating and curing a hydroxyl acrylic polyol copolymer solution, and the haze of the diffusion layer 6012 is 3-10%.

[0072] In a preferred embodiment of the present invention, the hydroxy acrylic polyol copolymer solution comprises: a hydroxy acrylic polyol copolymer, a curing agent, an auxiliary agent, organic particles and a diluent;

[0073] Preferably, the hydroxy acrylic polyol copolymer solution comprises, by weight, 15 to 35 parts of hydroxy acrylic polyol copolymer, 5 to 10 parts of curing agent, 0.1 to 1.0 parts of auxiliary agent, 0.1 to 1.0 parts of organic particles and 50 to 80 parts of diluent.

[0074] In a preferred embodiment of the present invention, the thickness of the first transparent substrate layer 601 is 50-500 um;

[0075] The thickness of the wide viewing angle structural layer 6011 is 50-60 um;

[0076] The diffusion layer 6012 has a thickness of 5 to 10 um;

[0077] The thickness of the second transparent substrate layer 602 is 50-500 um;

[0078] The thickness of the prism structure layer 6021 is 25-35 um;

[0079] The anti-scratch layer 6022 has a thickness of 5 to 10 um;

[0080] The thickness of the adhesive layer 603 is 0.2-2 um.

[0081] According to one aspect of the present invention, a liquid crystal display device comprises the composite wide-viewing angle optical film 600;

[0082] The liquid crystal display device is arranged in order from bottom to top including a diffusion plate 100 , a composite wide-viewing angle optical film 600 and a liquid crystal panel 400 .

[0083] The liquid crystal display device provided by the present invention comprises a diffusion plate 100, the composite wide-viewing angle optical film 600 of the present invention, and a liquid crystal panel 400 arranged in order from bottom to top. Determined by the performance of the composite wide-viewing angle optical film 600 of the present invention, the liquid crystal display device can maintain a wide viewing angle while maintaining a luminance gain, thereby effectively solving the problem of graininess of the display screen.

[0084] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0085] Example 1

[0086] Figure 1 FIG. 6 is a schematic structural diagram of the composite wide-viewing angle optical film 600 of this embodiment. Figure 1 Each of the plurality of trapezoidal structures on the medium-wide viewing angle structure layer 6011 extends along the first direction D1, and the plurality of trapezoidal structures are arranged along the second direction D2.

[0087] See also Figure 1 , a composite wide-viewing angle optical film 600, the composite wide-viewing angle optical film 600 comprises a first transparent substrate layer 601 and a second transparent substrate layer 602, wherein:

[0088] The first transparent substrate layer 601 has a first optical surface and a second optical surface, the first optical surface is provided with a wide viewing angle structure layer 6011, the second optical surface is an opposite surface of the first optical surface, and the second optical surface is provided with a diffusion layer 6012;

[0089] The second transparent substrate layer 602 has a third optical surface and a fourth optical surface, the third optical surface is provided with a prism structure layer 6021, the fourth optical surface is an opposite surface of the third optical surface, and the fourth optical surface is provided with an anti-scratch layer 6022;

[0090] The wide-viewing angle structure layer 6011 on the first optical surface is bonded and compounded with the prismatic structure layer 6021 on the third optical surface, and an adhesive layer 603 is formed between the wide-viewing angle structure layer 6011 on the first optical surface and the prismatic structure layer 6021 on the third optical surface.

[0091] In this embodiment, the first transparent substrate layer 601 and the second transparent substrate layer 602 are both made of high molecular polymer resin.

[0092] The high molecular polymer resin is polyethylene terephthalate.

[0093] The thickness of the first transparent substrate layer 601 and the second transparent substrate layer 602 are both 125 um.

[0094] In this embodiment, the wide viewing angle structure layer 6011 and the prism structure layer 6021 are made of the same material, both of which are made of ultraviolet light curing resin;

[0095] The ultraviolet light curing resin is acrylic resin; the liquid state resin refractive index of the ultraviolet light curing resin is 1.53.

[0096] In this embodiment, the cross section of the wide viewing angle structure layer 6011 described in this embodiment is a plurality of isosceles trapezoidal structures.

[0097] Figure 2 FIG. 6 is a cross-sectional view of the trapezoidal structure of the wide viewing angle structure layer 6011 of this embodiment. Figure 2 In the medium trapezoidal structure, the trapezoidal base angles α=67°, β=67°, the trapezoidal height h1=50um, and the trapezoidal base L1=50um.

[0098] In this embodiment, the cross section of the prism structure layer 6021 described in this embodiment is a plurality of isosceles right triangle structures.

[0099] Figure 3 FIG. 6 is a cross-sectional view of the micro-prism structure of the prism structure layer 6021 of this embodiment. Figure 3 In the medium prism structure, the prism vertex angle δ=90°, the prism height h2=25um, and the prism bottom edge a1=50um.

[0100] In this embodiment, the adhesive layer 603 is composed of ultraviolet light curing resin;

[0101] The UV-curable resin is acrylic resin; the UV-curable resin constituting the adhesive layer 603 has a refractive index of 1.49 in liquid state.

[0102] In this embodiment, the diffusion layer 6012 is mainly obtained by coating and curing a hydroxy acrylic acid polyol copolymer solution, and the haze of the diffusion layer 6012 is 10%;

[0103] In this embodiment, the anti-scratch layer 6022 is mainly obtained by coating and curing a hydroxylated acrylic polyol copolymer solution, and the haze of the diffusion layer 6012 is 5%.

[0104] Preferably, the hydroxy acrylic polyol copolymer solution comprises, by weight: 30 parts of polyhydroxy acrylate, 8 parts of polyisocyanate trimer as a curing agent, 0.5 parts of a leveling agent as an auxiliary agent, 0.5 parts of polymethyl methacrylate particles as organic microparticles, and a mixture of ethyl acetate and butyl acetate in a ratio of 1:1 as a diluent.

[0105] In this embodiment, the thickness of the first transparent substrate layer 601 is 125 um;

[0106] The thickness of the wide viewing angle structure layer 6011 is 55 um;

[0107] The thickness of the diffusion layer 6012 is 8 um;

[0108] The thickness of the second transparent substrate layer 602 is 125 um;

[0109] The thickness of the prism structure layer 6021 is 30 um;

[0110] The thickness of the anti-scratch layer 6022 is 6 um;

[0111] The thickness of the adhesive layer 603 is 1 um.

[0112] Example 2

[0113] Adjustments are made on the basis of Example 1. In this example, the trapezoidal structure has a trapezoidal bottom angle α=60°, β=60°, a trapezoidal height h1=50 um, and a trapezoidal bottom side L1=50 um.

[0114] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0115] The difference between this embodiment and embodiment 1 is only the difference in the trapezoidal structure.

[0116] Example 3

[0117] Adjustments are made on the basis of Example 1. In this example, the trapezoidal structure has a trapezoidal bottom angle α=80°, β=80°, a trapezoidal height h1=50 um, and a trapezoidal bottom side L1=50 um.

[0118] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0119] The difference between this embodiment and embodiment 1 is only the difference in the trapezoidal structure.

[0120] Example 4

[0121] Adjustments are made on the basis of Example 1. In this example, the trapezoidal structure has a trapezoidal base angle α=50°, β=50°, a trapezoidal height h1=50 um, and a trapezoidal base L1=50 um.

[0122] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0123] The difference between this embodiment and embodiment 1 is only the difference in the trapezoidal structure.

[0124] Example 5

[0125] Adjustments are made on the basis of Example 1. In this example, the trapezoidal structure has a trapezoidal bottom angle α=85°, β=85°, a trapezoidal height h1=50 um, and a trapezoidal bottom side L1=50 um.

[0126] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0127] The difference between this embodiment and embodiment 1 is only the difference in the trapezoidal structure.

[0128] Example 6

[0129] Adjustments are made on the basis of Example 1. In the prism structure of this embodiment, the prism vertex angle δ is 60°, the prism height h2 is 43 um, and the prism bottom edge a1 is 50 um.

[0130] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0131] The difference between this embodiment and embodiment 1 is only the difference in the prism structure.

[0132] Example 7

[0133] Adjustments are made on the basis of Example 1. In the prism structure of this embodiment, the prism vertex angle δ is 120°, the prism height h2 is 14.4 um, and the prism bottom edge a1 is 50 um.

[0134] In this embodiment, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Embodiment 1.

[0135] The difference between this embodiment and embodiment 1 is only the difference in the prism structure.

[0136] Comparative Example 1

[0137] Based on Example 1, this comparative example replaces the trapezoidal structure on the wide viewing angle structure layer 6011 with a micro-prism structure.

[0138] In the micro-prism structure, the prism top angle δ=90°, the prism height h2=25um, and the prism bottom edge a1=50um.

[0139] In this comparative example, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Example 1.

[0140] The difference between this comparative example and Example 1 is that the trapezoidal structure in the wide viewing angle structure layer 6011 is replaced by a micro-prism structure.

[0141] Comparative Example 2

[0142] Based on Example 1, this comparative example replaces several micro-prism structures on the prism structure layer 6021 with trapezoidal structures;

[0143] In the trapezoidal structure, the trapezoidal bottom angles α=67°, β=67°, the trapezoidal height h1=50 um, and the trapezoidal bottom side L1=50 um.

[0144] In this comparative example, the thickness of the first substrate, the thickness of the second substrate, the haze of the diffusion layer 6012, the haze of the anti-scratch layer, the refractive index of the trapezoidal structure, the refractive index of the prism structure layer 6021, the prism layer structure, the refractive index of the bonding layer and the thickness of the bonding layer are the same as those in Example 1.

[0145] The difference between this comparative example and Example 1 is that the several micro-prism structures on the prism structure layer 6021 are replaced with trapezoidal structures.

[0146] Test Example 1

[0147] In order to show that the composite wide-viewing angle optical film 600 of the present application has the technical effect of achieving a wide viewing angle of the film while maintaining high brightness of the film, the composite wide-viewing angle optical film 600 provided in Examples 1 to 3 of the present application is prepared into a liquid crystal display device and compared with the existing conventional liquid crystal display device architecture with a wide viewing angle function for optical performance.

[0148] Figure 4 This is a schematic diagram of the structure of a liquid crystal display device prepared using the composite wide-viewing angle optical film 600 in Example 1 of the present application. Figure 4 Each of the plurality of trapezoidal structures on the medium-wide viewing angle structure layer 6011 extends along the first direction D1, and the plurality of trapezoidal structures are arranged along the second direction D2.

[0149] The specific performance comparison results are shown in Table 1.

[0150] Table 1:

[0151]

[0152]

[0153] Note: Control group 1 is a conventional diffuser plate 100, a lower brightness enhancement film 200, an upper brightness enhancement film 300, and a liquid crystal display device structure with a wide viewing angle film 500 attached to a liquid crystal panel 400. For details, see Figure 4 Control group 2 is a liquid crystal display device architecture in which the upper brightness enhancement film 300 in the architecture of control group 1 is replaced with a diffusion film with a haze of 85% and a thickness of 188 um.

[0154] Figure 5 It is a schematic diagram of the structure of a conventional liquid crystal display device with a wide viewing angle film 500 in control group 1. Figure 5 The middle prism structure extends along the direction D1, and the prism structures are arranged along the direction D2.

[0155] As can be seen from Table 1, compared with the control group 1, the liquid crystal display devices prepared by the composite wide-viewing angle optical film 600 of Examples 1 to 3 of the present application have no graininess in the displayed images, and can maintain a wide viewing angle without changing the luminance gain; compared with the control group 2, the displayed images of Examples 1-2 are better, without graininess, and can improve the luminance gain while maintaining a wide viewing angle;

[0156] In the composite wide-viewing angle optical film 600 of embodiments 1 to 3 of the present application, embodiment 1 is the best embodiment. The viewing angle can be significantly improved while maintaining the level of the central brightness gain. Embodiment 4 can significantly improve the viewing angle, but the brightness gain decreases significantly; embodiment 5 can improve the brightness gain, but the viewing angle decreases more; embodiment 6 can maintain a small change in the viewing angle, but the brightness decreases significantly; embodiment 7 has an improved viewing angle, but the brightness gain decreases significantly;

[0157] Comparative Example 1 has excellent luminance gain, but poor viewing angle; Comparative Example 2 has good viewing angle, but poor luminance gain. Comparative Example 1 and Comparative Example 2 cannot achieve both excellent luminance gain and viewing angle.

[0158] In summary, the present invention designs a trapezoidal structure of the wide viewing angle layer to correct the light distribution after passing through the liquid crystal display device, thereby increasing the brightness value on both sides of the liquid crystal display device, solving the problem of the narrow viewing angle of the liquid crystal display device, and improving the overall uniformity of the picture.

[0159] In addition, the present invention increases the brightness of both sides of the liquid crystal display device, widens the viewing angle, and can still maintain the average brightness of the center area of ​​the backlight module, solving the problem of grainy display. Therefore, the brightness of the entire screen area of ​​the liquid crystal display can also be increased, improving the performance of the liquid crystal display device.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite wide-viewing angle optical film (600), characterized in that: The composite wide-viewing angle optical film (600) comprises a first transparent substrate layer (601) and a second transparent substrate layer (602), wherein: The first transparent substrate layer (601) has a first optical surface and a second optical surface, the first optical surface is provided with a wide viewing angle structure layer (6011), the second optical surface is an opposite surface of the first optical surface, and the second optical surface is provided with a diffusion layer (6012); The second transparent substrate layer (602) has a third optical surface and a fourth optical surface, the third optical surface is provided with a prism structure layer (6021), the fourth optical surface is an opposite surface of the third optical surface, and the fourth optical surface is provided with an anti-scratch layer (6022); The wide-viewing angle structural layer (6011) on the first optical surface and the prism structural layer (6021) on the third optical surface are bonded and compounded, and an adhesive layer (603) is formed between the wide-viewing angle structural layer (6011) on the first optical surface and the prism structural layer (6021) on the third optical surface.

2. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The wide viewing angle structure layer (6011) is composed of a plurality of trapezoidal structures; Preferably, the trapezoidal structure is an isosceles trapezoidal structure.

3. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The prism structure layer (6021) is composed of a plurality of micro-prism structures; Preferably, the micro-prismatic structure is an isosceles right triangle structure.

4. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The first transparent substrate layer (601) is composed of a high molecular polymer resin; And / or, the second transparent substrate layer (602) is composed of a high molecular polymer resin; Preferably, the high molecular polymer resin includes at least one of polyethylene terephthalate, polycarbonate, polymethyl methacrylate, polyethylene, polyvinyl chloride, and polypropylene.

5. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The wide viewing angle structural layer (6011) is composed of ultraviolet light curing resin; And / or, the prism structure layer (6021) is composed of ultraviolet light curing resin; Preferably, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin; More preferably, the refractive index of the liquid state of the UV-curable resin is 1.35 to 1.

70.

6. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The adhesive layer (603) is composed of ultraviolet light curing resin; Preferably, the UV-curable resin includes at least one of epoxy resin, urethane resin, polyethylene resin or polyester resin; More preferably, the refractive index of the liquid state of the UV-curable resin is 1.35 to 1.

55.

7. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The diffusion layer (6012) is mainly obtained by coating and curing a hydroxyl acrylic polyol copolymer solution, and the haze of the diffusion layer (6012) is 5 to 80%; And / or, the anti-scratch layer (6022) is mainly obtained by coating and curing a hydroxyl acrylic polyol copolymer solution, and the haze of the diffusion layer (6012) is 3-10%.

8. The composite wide-viewing angle optical film (600) according to claim 7, characterized in that: The hydroxy acrylic polyol copolymer solution comprises: a hydroxy acrylic polyol copolymer, a curing agent, an auxiliary agent, organic particles and a diluent; Preferably, the hydroxy acrylic polyol copolymer solution comprises, by weight, 30 parts of hydroxy acrylic polyol copolymer, 8 parts of curing agent, 0.5 parts of auxiliary agent, 0.5 parts of organic particles and 61 parts of diluent.

9. The composite wide-viewing angle optical film (600) according to claim 1, characterized in that: The thickness of the first transparent substrate layer (601) is 50 to 500 um; The thickness of the wide viewing angle structural layer (6011) is 50-60 um; The diffusion layer (6012) has a thickness of 5 to 10 um; The thickness of the second transparent substrate layer (602) is 50-500 um; The thickness of the prism structure layer (6021) is 25-35 um; The anti-scratch layer (6022) has a thickness of 5 to 10 um; The thickness of the adhesive layer (603) is 0.2-2 um.

10. A liquid crystal display device, characterized in that: The liquid crystal display device comprises the composite wide-viewing angle optical film (600) according to any one of claims 1 to 9; The liquid crystal display device is arranged in order from bottom to top according to a diffusion plate (100), a composite wide-viewing angle optical film (600) and a liquid crystal panel (400).

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