CN220796168U - Optical composite film and display device - Google Patents
Optical composite film and display device Download PDFInfo
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- CN220796168U CN220796168U CN202322640060.7U CN202322640060U CN220796168U CN 220796168 U CN220796168 U CN 220796168U CN 202322640060 U CN202322640060 U CN 202322640060U CN 220796168 U CN220796168 U CN 220796168U
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Abstract
An optical composite film comprising a substrate layer, a reflective structure layer, a refractive structure layer, a brightness enhancing layer; the reflecting structure layer, the first refraction structure layer and the second refraction structure layer comprise a plurality of prism structures which are basically arranged in parallel along a first direction X and are arranged along a second direction Y; the reflecting structure layer prism structure and the first refraction structure layer prism structure are arranged in opposite directions, and the distance S between the vertexes of the reflecting structure layer prism structure and the vertexes of the prism structures corresponding to the first refraction structure layer in the second direction Y is not more than 50% of the width of the first refraction structure layer prism structure in the second direction Y. The application sets up and the refracting index matches through ingenious structure between reflection structure layer 2 and the refracting structure layer 3 for light is openly penetrated from optical composite film, uses in the display device, has promoted luminance, has higher collimation simultaneously.
Description
Technical Field
The utility model relates to an optical composite film and a display device.
Background
With the consideration of technical iterative development of optical films, cost and other factors, the traditional single optical film is gradually replaced by a composite film, and the lower prism, the upper prism and the upper diffusion, namely DPP three-layer structure or DOP, MOP, POP and other two-layer structure can be replaced by the composite film at present, but the current industry can not be replaced by a reflecting sheet and a light guide plate/diffusion plate, a customer needs to assemble the optical materials such as the reflecting sheet, the light guide plate, DPP and the like in the use and cutting process, and each sheet is cut and assembled with poor loss and increased labor hour cost; in addition, the use of excessive films can increase the brightness, but the overall thickness of the backlight is very high, and the backlight cannot adapt to the development trend of market thinning
For the problem of side-entry backlight module, it is generally adopted in the industry to replace the previous upper prism, lower prism and lower diffusion with a reverse prism film, but the thickness of the backlight module is still thicker due to the need of using a reflective sheet and a Light Guide Plate (LGP). Meanwhile, the backlight module adopting the reflecting sheet and the light guide plate structure is high in overall thickness and insufficient in brightness. An integrated optical composite film is needed for a display device, which can reduce the thickness of a backlight module and improve the brightness.
Disclosure of Invention
In order to solve the defects in the prior art, the utility model provides an optical composite film, which reduces the thickness of a backlight module and improves the brightness by structural matching between a refraction structure layer and a reflection structure layer.
The technical problems to be solved by the utility model are realized by the following technical scheme:
an optical composite film comprising a substrate layer, a reflective structure layer, a refractive structure layer;
a substrate layer comprising at least a first substrate layer and a second substrate layer;
the reflecting structure layer is arranged on one side surface of the first substrate layer;
the refraction structure layer is arranged on one side surface of the second substrate layer and comprises a first refraction structure layer and a second refraction structure layer which are complementarily arranged;
the reflecting structure layer, the first refraction structure layer and the second refraction structure layer comprise a plurality of prism structures which are basically arranged in parallel along a first direction X and are arranged along a second direction Y; the reflecting structure layer prism structure and the first reflecting structure layer prism structure are arranged in opposite directions;
the prism structure on the first refraction structure layer comprises a light incident surface, a first light emergent surface and a second light emergent surface, and an included angle beta between the light incident surface and the second substrate layer 1 85-95 DEG, the first light-emitting surface is arranged on the surface of the second substrate layer, and an included angle alpha between the second light-emitting surface and the light-entering surface 1 40-50 degrees;
the prism structure on the reflective structure layer comprises a first reflective surface, a second reflective surface and a bottom surface, and an included angle beta between the first reflective surface and the first substrate layer 2 85-95 DEG, the bottom surface is arranged on the surface of the first substrate layer, and the included angle alpha between the second reflecting surface and the first reflecting surface 2 40-50 deg..
Further, a space S between the vertex of the prism structure of the reflective structure layer and the vertex of the prism structure corresponding to the first refractive structure layer in the second direction Y is not more than 50% of a width of the prism structure of the first refractive structure layer in the second direction Y.
Further, the second refraction structure layer is filled in the gap between the first refraction structure layers, and the surface of one side of the refraction structure layer far away from the second substrate layer is a flat surface.
Further, the refractive index n of the first refractive structure layer 1 Is greater than the refractive index n of the second refractive structure layer 2 The method comprises the steps of carrying out a first treatment on the surface of the Refractive index n of the first refractive structure layer 1 =1.53 to 1.7, the second refractive index n 2 ＝1.45～1.53。
Further, the reflective structure layer comprises a reflective structure substrate and a reflective layer, wherein the height of the reflective structure substrate is 10-50 um, and the thickness of the reflective layer is 1-3 um.
Further, the prism structure height of the first refraction structure layer is 10-50 um.
Further, the optical composite film further comprises a brightening layer and a diffusion layer, wherein the brightening layer is arranged on one side, far away from the refraction structure layer, of the second substrate layer, and the diffusion layer is arranged on one side surface, far away from the second substrate layer, of the brightening layer.
Further, the optical composite film further comprises an adhesive layer, wherein the adhesive layer comprises a first adhesive layer and a second adhesive layer; the first adhesive layer is arranged between the reflecting structure layer and the refracting structure layer, and the second adhesive layer is arranged between the brightness enhancement layer and the second substrate layer.
Further, the haze of the diffusion layer is 10% -50%; refractive index n of the diffusion layer 3 1.47 to 1.53.
A display device, wherein the display device employs the optical composite film described in one of the above.
The application discloses an optical composite film, light guide plate, reflector plate, inverse prism structural sheet, brightness enhancement film and diffusion film in with current backlight unit compound into an optical film, with backlight unit optical material integration, greatly reduced backlight unit's thickness. Through ingenious structural arrangement and refractive index matching between the reflecting structure layer 2 and the refractive structure layer 3, light rays are emitted from the front surface of the optical composite film, and the light source is applied to a display device, so that the brightness is improved, and meanwhile, the light source has higher collimation degree.
Drawings
FIG. 1 is a side view of an optical composite film of an embodiment;
FIG. 2 is a side view of an optical composite film of an embodiment;
FIG. 3 is a schematic view of the optical path in an optical composite film according to one embodiment;
FIG. 4 is a schematic view showing the positional relationship of a first refractive structure layer and a reflective structure layer;
reference numerals:
11. a first substrate layer; 12. a second substrate layer; 2. a reflective structure layer; 21. a reflective structure substrate; 22. a reflective layer; 3. a refractive structural layer; 31. a first refractive structure layer; 32. a second refractive structure layer; 51. a brightness enhancing layer; 52. a diffusion layer; 4. an adhesive layer; 41. a first adhesive layer; 42. a second adhesive layer; 6. a light emitting source; x, a first direction; y, second direction; s, spacing.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments of the embodiments.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The utility model will now be described in detail with reference to the drawings and examples.
In order to solve the problems of the existing backlight module, the thickness of the backlight module is larger and the brightness is insufficient due to the fact that the independent light guide plate, the reflecting sheet, various upper prism sheets, the lower prism sheets, the diffusion sheets and other optical films are still required to be used in a laminated mode. This application is with reflector plate, light guide plate, inverse prism diaphragm, on Diffusion (DBEF) integrated to an optical composite film, very big reduction the product total thickness, very big reduction customer cut equipment cost and yield problem, with backlight unit optical material integration, design and collocation to optical composite film's structure simultaneously, make it have higher luminance.
Referring to fig. 1 and 4, an optical composite film includes a substrate layer, a reflective structure layer 2, a refractive structure layer 3, and a brightness enhancing layer 51;
a substrate layer including at least a first substrate layer 11 and a second substrate layer 12;
a reflective structure layer 2 provided on one side surface of the first base material layer 11;
the refraction structure layer 3 is arranged on one side surface of the second substrate layer 12, the refraction structure layer 3 comprises a first refraction structure layer 31 and a second refraction structure layer 32, and the first refraction structure layer 31 and the second refraction structure layer 32 are complementarily arranged;
the reflective structure layer 2, the first refractive structure layer 31 and the second refractive structure layer 32 comprise a plurality of prism structures which are arranged in parallel along the first direction X and arranged along the second direction Y; the prism structures of the reflective structure layer 2 and the prism structures of the first refractive structure layer 31 are arranged in opposite directions, and the distance S between the vertex of the prism structure of the reflective structure layer 2 and the vertex of the prism structure corresponding to the first refractive structure layer 31 in the second direction is not more than 50% of the width of the prism structure of the first refractive structure layer 31 in the second direction Y, if the distance between the vertex of the prism structure of the reflective structure layer 2 and the vertex of the prism structure of the first refractive structure layer 31 in the second direction Y is too large, a light leakage phenomenon occurs, which results in a lower light utilization rate, preferably, 20% of the width of the prism structure of the first refractive structure layer 31 in the second direction Y, and more preferably, the distance S between the vertex of the prism structure of the reflective structure layer 2 and the vertex of the prism structure of the first refractive structure layer 31 in the second direction Y is 0um. It should be clear that, since the reflective structure layer 2 and the first refractive structure layer 31 each have a plurality of prism structures, the prism structure vertices here are opposite and mutually corresponding prism structure vertices, the opposite is that the prism structure vertices are disposed toward opposite, and the vertex here is that of the cross section of the prism structure in the second direction Y.
Specifically, as shown in fig. 1 and 2, the substrate layers are used to provide support and strength to the optical composite film, wherein a first substrate layer 11 is used to provide an adhesion basis for the reflective structure layer 2 and a second substrate layer 12 is used to provide an adhesion basis for the refractive structure layer 3. The material of the substrate layer is not specially selected, and can be selected from conventional high-light-transmission optical grade materials such as PET, PC and the like. When the thickness of the substrate layer is smaller than 25um, the substrate layer is too thin, the temperature of the light-emitting source is higher, so that the optical composite film is subjected to buckling deformation, the light of the light-in surface cannot enter all, the light utilization rate is low, when the thickness of the substrate layer is too large, the overall film thickness is increased, the light transmittance is reduced, and the trend of thinning is not met. Further, the substrate layer has a light transmittance of greater than 95% and a haze of less than 1%.
Specifically, the reflective structure layer 2 is configured to reflect light, and is disposed on a surface of the first substrate layer 11. The refraction structure layer 3 is used for refracting light rays emitted from the side light source to enable the light rays to be emitted from the front face of the optical composite film, and the refraction structure layer 3 is arranged on one side surface of the second substrate layer 12. The refraction structure layer 3 comprises a first refraction structure layer 31 and a second refraction structure layer 32, and the first refraction structure layer 31 and the second refraction structure layer 32 are complementarily arranged. The first refractive structure layer 31, the second refractive structure layer 32 and the reflective structure layer 2 are each composed of a plurality of prism structures extending along the first direction X and arranged in parallel in the second direction Y. The prism structures of the first refractive structure layer 31 and the prism structures of the second refractive structure layer are mutually embedded, the prism structures of the first refractive structure layer 31 and the prism structures of the reflective structure layer 2 are oppositely arranged along the second direction Y, it is to be understood that the cross section of the prism structures in the second direction Y is triangular, the vertex direction of one side, far away from the base material layer, of the cross section of the prism structures is defined as the positive direction of the prism structures, and the prism structures of the first refractive structure layer 31 and the prism structures of the reflective structure layer 2 are oppositely arranged along the second direction Y, that is, the vertex of the cross section of the prism structures of the first refractive structure layer 31 and the vertex of the cross section of the prism structures of the reflective structure layer 2 are oppositely arranged. Further, the prism structures of the first refractive structure layer 31 and the prism structures of the reflective structure layer 2 are substantially arranged in mirror symmetry along the second direction Y. Still further, to ensure that the incident light is controlled to substantially exit from the front surface of the optical composite film, the prismatic structures of the reflective structure layer 2 are disposed in substantially aligned contact with the apexes of the prismatic structures of the first refractive structure layer 31. In addition, it should be clear that the above-mentioned expressions of basic mirror image setting and basic alignment setting are basically a fault tolerant expression, and absolute mirror image and alignment setting cannot be ensured in the actual product manufacturing process, so that similar effects can be achieved in a certain range of position deviation.
Further, the first refractive structure layer 31 includes a light incident surface, a first light emergent surface and a second light emergent surface, and an included angle β between the light incident surface and the second substrate layer 12 1 85-95 DEG, the first light emergent surface is arranged on the surface of the second substrate layer 12, and an included angle alpha between the second light emergent surface and the light incident surface 1 40-50 deg..
Specifically, when the optical composite film is applied to the backlight module, there is a side-in light-emitting source 6, and the light-emitting source 6 is disposed on one side surface of the first refractive structure layer 31 in the thickness direction of the optical composite film. The first refractive structure layer 31 includes a light incident surface, the light incident surface is a side surface directly opposite to the light emitting source 6, the first refractive structure layer 31 further includes a first light emitting surface and a second light emitting surface, the first light emitting surface is disposed on a side surface of the second substrate layer 12, and the second light emitting surface is directly contacted with the second refractive structure layer 32. An included angle beta between the light incident surface of the first refractive structure layer 31 and the first substrate layer 11 1 An included angle alpha between the second light emergent surface and the light incident surface is 85-95 DEG 1 40-50 deg.. Further, in order to ensure that most of the incident light energy is totally reflected on the second light-emitting surface, it is preferable that the included angle β between the light-emitting surface of the first refractive structure layer 31 and the first substrate layer 11 1 An included angle alpha between the second light emergent surface and the light incident surface is 88-92 degrees 1 43-47 degrees; most preferably, the cross section of the first refractive structure layer 31 in the second direction Y is isosceles right triangle, i.e. the beta 1 90 DEG, said alpha 1 45 deg..
Further, the second refractive structure layer 32 fills the gaps between the first refractive structure layers 31, and the surface of the refractive structure layer 3 on the side far from the second substrate layer 12 is a flat surface.
Specifically, the second refractive structure layer 32 is essentially a filling layer, i.e. a filling gap between the prism structures of the first refractive structure layer 31 is provided, and the bottom surfaces of the prism structures are provided in contact with each other. The prism structures of the first refractive structure layer 31 and the prism structures of the second refractive structure layer 32 are complementary to form a refractive structure layer 3 with a flat surface.
Further, the first refractive structure layer 31 has a refractive index n 1 Is greater than the refractive index n of the second refractive structure layer 32 2 The method comprises the steps of carrying out a first treatment on the surface of the Preferably, the first refractive structure layer 31 has a refractive index n 1 =1.53 to 1.7, the second refractive structure layer 32 has a refractive index n 2 ＝1.45～1.53。
Specifically, the incident light directly irradiates the first refractive structure layer 31 along the second direction Y, most of the light is totally reflected on the second light-emitting surface of the first structural layer, so that the light exits the refractive structure layer 3 in a direction perpendicular to the first light-emitting surface, part of the light which does not irradiate along the second direction Y directly exits from the first light-emitting surface, part of the light enters the second refractive structure layer 32 from the second light-emitting surface and enters the reflective structure layer 2 through the second refractive structure layer 32, and the light is reflected by the reflective structure layer 2 to return to the second refractive structure layer 32 and enter the first refractive structure layer 31 and exit in a direction perpendicular to the first light-emitting surface. From the light refraction point of view, the first refractive structure layer 31 has a refractive index n 1 Is greater than the refractive index n of the second refractive structure layer 32 2 The refracted light ray angles are more concentrated and tend to emit light from the front face, so that the light ray utilization rate is improved; preferably, the first refractive structure layer 31 has a refractive index n 1 =1.53 to 1.7, the second refractive structure layer 32 has a refractive index n 2 =1.45 to 1.53; further preferably, the first refractive structure layer 31 has a refractive index n 1 =1.6 to 1.7, the second refractive structure layer 32 has a refractive index n 2 =1.45 to 1.48, said n 1 And n 2 The larger the difference between the n is, the more favorable the light utilization rate is, from the light utilization rate point of view 1 And n 2 The difference between them is greater than 0.2.
Further, in order to ensure that the light can sufficiently enter the brightness enhancing layer 5, the prism structure height of the first refractive structure layer 31 is 10-50 um.
Specifically, the refractive structure layer 3 material is selected from ultraviolet light curing acrylic resin.
Further, the reflective structure layer 2 includes a first reflection thereonA face, a second reflecting face and a bottom face, wherein an included angle beta between the first reflecting face and the first substrate layer 11 2 85-95 DEG, the bottom surface is arranged on the surface of the first substrate layer 11, and the included angle alpha between the second reflecting surface and the first reflecting surface 2 40-50 deg..
Further, the reflective structure layer 2 includes a reflective structure substrate 21 and a reflective layer 22, the reflective structure substrate 21 has a height of 10 to 50um, and the reflective layer 22 has a thickness of 1 to 3um.
In particular, for better reflection of light, more light is emitted from the surface of the second substrate layer 12 perpendicular to the first substrate layer 11, and the angle beta between the first reflecting surface and the first substrate layer 11 2 88-92 DEG, the bottom surface is arranged on the surface of the first substrate layer 11, and the included angle alpha between the second reflecting surface and the first reflecting surface 2 43-47 degrees; most preferably, the cross section of the refraction structure layer 3 in the second direction Y is isosceles right triangle, namely the beta 2 90 DEG, said alpha 2 45 deg..
Specifically, the reflective structure layer 2 may be directly formed from a reflective material, and from the viewpoint of the manufacturing process, it is preferable that the reflective structure layer 2 includes a reflective structure base 21 and a reflective layer 22, the reflective structure base 21 has a height of 10 to 50um, and the reflective layer 22 has a thickness of 1 to 3um. The height of the reflective structure substrate 21 refers to the dimension of the reflective structure substrate 21 along the direction perpendicular to the surface of one side of the substrate layer. The reflecting layer 22 may be obtained by vacuum coating a reflecting material on the surface of the substrate of the reflecting structure layer 2, where the reflecting material is any one of high-reflectivity materials such as aluminum, silver, copper, etc., and the reflecting layer 22 may also have a multilayer structure.
Referring to fig. 3, the side-entering light source 6 is disposed on one side of the first refractive structure layer 31, and light enters the first refractive structure layer 31 through the light incident surface of the first structure layer, and since the refractive structure layer 3 and the reflective structure layer 2 of the present application are disposed through special structures, the 45 ° beam splitter has a vertical total reflection effect on parallel light, that is, light incident from the vertical light incident surface will generate total reflection on the second light incident surface and be emitted from the vertical first light incident surface. The light rays with other angles are transmitted or refracted to the surface of the second refraction structure layer 32 for total reflection or enter the reflection structure layer 2 for reflection and then return to the first refraction structure layer 31, and are emitted perpendicular to the first light emitting surface of the first refraction structure layer 31. Through the structure, the front brightness of the optical composite film is improved, and the structures such as the reflecting layer 22, the light guide plate, the inverse prism sheet and the like can be integrated in the reflecting structure layer 2 and the refracting structure layer 3, so that the thickness of the backlight module is greatly reduced.
Further, the optical composite film further includes an adhesive layer 4, the adhesive layer 4 including a first adhesive layer 41 and a second adhesive layer 42; the first adhesive layer 41 is disposed between the reflective structure layer 2 and the refractive structure layer 3, and the second adhesive layer 42 is disposed between the brightness enhancing layer 51 and the second substrate layer 12.
Specifically, in order to realize the adhesion performance between each unit of the optical composite film, the optical composite film comprises an adhesion layer 4, the thickness of the first adhesion layer 41 is 2-3 um, the thickness of the second adhesion layer 42 is 6-12 um, excessive light absorption can be caused by the overlarge thickness of the adhesion layer 4, the brightness becomes low, the adhesion force is insufficient, the delamination risk is easy to occur, the adhesion layer 42 is made by surface adhesion, the problem of bubbles is easy to occur due to the overlarge thickness, and the bubbles can cause bulge delamination under the high-temperature condition. The material of the adhesive layer 4 is not particularly limited, and is preferably OCA-type optical adhesive.
Further, the optical composite film further comprises a diffusion layer 52, wherein the diffusion layer 52 is arranged on the surface of one side of the brightness enhancing layer 51 away from the second substrate layer 12; preferably, the haze of the diffusion layer 52 is 10% to 50%; preferably, the refractive index n of the diffusion layer 52 3 1.47 to 1.53.
Specifically, the optical composite film further includes a brightness enhancement layer 51, where the brightness enhancement layer 51 is a reflective brightness enhancement film, and is used to enhance the brightness of the optical composite film, where the reflective brightness enhancement film may be a commercially available product, such as a product of manufacturers such as 3M, taiwan caryopsis, taiwan euro, wiki, etc., preferably, the brightness enhancement layer 51 is a caryopsis DBEF reflective brightness enhancement film, and in addition, the thickness of the reflective brightness enhancement film has no special choice, and the thickness of the reflective brightness enhancement film follows the thickness of the reflective brightness enhancement filmThe thickness of each product is different and is generally in the range of 30-100 um; the surface of the diffusion layer 52 far away from the brightening layer 51 is provided with an irregular microstructure, the haze of the diffusion layer 52 is 10-50%, and the refractive index n of the diffusion layer 52 3 1.47 to 1.53. The diffusion layer 52 slightly diffuses the concentrated light emitted from the brightness enhancement layer 51, and has a certain effect of enlarging the viewing angle and concealing the light; if the haze is more than 50%, the effect of scattering light is too remarkable, resulting in a reduction of the effective light in front view, and the brightness becomes low, and if the haze is less than 10%, the viewing angle is reduced, and the haze of the diffusion layer 51 is preferably 30%. The diffusion layer 52 has a roughness Ra of 0.3 to 0.5.
The optical composite film can be prepared by the following method:
the preparation of the optical composite film can be roughly divided into three stages of preparation of the reflection module B, preparation of the brightness enhancement module A and assembly of the optical composite film.
Step one, preparation of a reflection module
Firstly, taking a first substrate layer 11, and embossing and forming the surface of one side of the first substrate layer 11 by using acrylic resin or directly dripping glue, embossing and curing and forming to obtain a reflecting structure layer 2;
and secondly, aluminizing a film on the surface of the reflecting structure layer 2, which is not contacted with the first substrate layer 11, by a vacuum coating process, wherein the thickness of the reflecting layer 22, namely the aluminum film, is 1-3 um, so as to obtain the reflecting module.
Step two, preparation of brightening module
The first step, the second substrate layer 12 and the brightening layer 51 are taken, a second adhesive layer 42 with the thickness of 2-3 um is coated on the surface of one side of the second substrate layer 12, and the brightening layer 51 is attached on the side of the second adhesive layer 42 far away from the second substrate layer 12;
secondly, stamping acrylic resin on the surface of one side of the brightening layer 51 far away from the second substrate layer 12 by adopting a hard wheel sand blasting mould, and solidifying to form a diffusion layer 52;
thirdly, embossing and forming the surface of the side, far away from the brightness enhancement layer 51, of the second substrate layer 12 by using acrylic resin or directly dripping glue, embossing and curing and forming to obtain a first refraction structure layer 31;
and fourthly, filling acrylic resin in the gap of the first refraction structure layer 31, or adopting mirror hard wheel rolling filling to obtain a second refraction structure layer 32, so as to obtain the brightening module.
Step three, assembling the optical composite film
And (3) taking the brightening module obtained in the second and fourth steps, coating a first adhesive layer 41 with the thickness of 2-3 um on the surface of one side of the second refraction structure layer 32 far from the second substrate layer 12, and attaching the reflection module obtained in the first step to one side of the first adhesive layer 41 far from the second substrate layer 12, wherein the reflection structure layer 2 is in direct contact with the first adhesive layer 41, and the prism structure tip end of the reflection structure layer 2 and the prism structure tip end of the first refraction structure layer 31 are ensured to be arranged in substantial alignment.
A display device, wherein the display device employs the optical composite film of any one of the above.
Compared with some backlight module schemes in the prior art, for example, a scheme of matching a special-shaped light guide plate with a reverse prism structure disclosed in Chinese patent CN111487708A, or a scheme of matching a conventional reflecting sheet with a light guide plate and a backlight module with an upper prism structure disclosed in Chinese patent CN204437871U, the optical composite film is integrally arranged, and is applied to the backlight module, so that the overall thickness is lower, the use cost is lower, and the brightness gain and the collimation degree are higher.
The application discloses an optical composite film, light guide plate, reflector plate, inverse prism structural sheet, brightness enhancement film and diffusion film in with current backlight unit compound into an optical film, with backlight unit optical material integration, greatly reduced backlight unit's thickness. Through ingenious structural arrangement and refractive index matching between the reflecting structure layer 2 and the refractive structure layer 3, light rays are emitted from the front surface of the optical composite film, and the light source is applied to a display device, so that the brightness is improved, and meanwhile, the light source has higher collimation degree.
Further description will be given by way of specific examples:
example 1
Step one, preparation of a reflection module
Firstly, taking an optical grade PET film as a first substrate layer 11, wherein the thickness of the PET film is 188um, adopting acrylic resin to imprint and shape on one side surface of the first substrate layer 11, adopting hard wheel processing in the imprinting stage, and obtaining a reflective structure substrate 21 by adopting a cutter with the angle of 45 DEG and the turning depth of 50um;
and secondly, plating aluminum film on the surface of the reflecting structure layer 2, which is not contacted with the first substrate layer 11, by a vacuum film plating process to obtain a reflecting layer 22, wherein the thickness of the reflecting layer 22, namely an aluminum film, is 2um, and a composite film of the reflecting structure layer 2 and the first substrate layer 11 is a reflecting module.
In the reflection module, the height of the reflection structure base 21 is 50um, and the beta is 2 90 DEG, said alpha 2 45 deg..
Step two, preparation of brightening module
The first step, a second substrate layer 12 and a brightening layer 51 are taken, wherein the material of the second substrate layer 12 is an optical grade PET film with the thickness of 188um, a second adhesive layer 42 with the thickness of 6um is coated on the surface of one side of the second substrate layer 12, the material of the second adhesive layer 42 is OCA optical adhesive, the brightening layer 51 is attached to one side of the second adhesive layer 42 far away from the second substrate layer 12, the brightening layer 51 is a brightening film of Yingtai company with the brand of EMOF-V1, and the thickness of the brightening layer 51 is 33um;
a second step of embossing acrylic resin on the surface of the side of the brightness enhancement layer 51 far away from the second substrate layer 12 by adopting a hard wheel sand blasting mold to solidify to form a diffusion layer 52, wherein the haze of the diffusion layer 52 is 30 percent, and the refractive index n is n 3 1.47, the thickness of the diffusion layer 52 is 5um, and the roughness Ra is 0.35;
third, the surface of one side of the second substrate layer 12 far away from the brightness enhancement layer 51 is stamped and formed by acrylic resin to obtain a first refraction structure layer 31, wherein a hard wheel is adopted for processing in the stamping stage, the cutter is 45 degrees, and the turning depth is 50um;
and fourthly, filling acrylic resin in the gap of the first refraction structure layer 31, or adopting mirror hard wheel rolling filling to obtain a second refraction structure layer 32, so as to obtain the brightening module.
In the first refractive structure layer 31, the structure height is 50um, the beta 1 90 DEG, said alpha 1 45 ° refractive index n of first refractive structure layer 31 1 1.67, the second refractive structure layer 32 refracts n 2 1.46.
Step three, assembling the optical composite film
And (3) taking the brightness enhancement module obtained in the fourth step, coating a first adhesive layer 41 with the thickness of 2um on the surface of one side of the second refraction structure layer 32 far from the second substrate layer 12, and attaching the reflection module obtained in the second step on one side of the first adhesive layer 41 far from the second substrate layer 12, wherein the reflection structure layer 2 is in direct contact with the first adhesive layer 41, and ensuring that the prism structure tip of the reflection structure layer 2 is aligned with the prism structure tip of the first refraction structure layer 31, namely, the spacing S=0.
The overall thickness of the optical composite film is 550um.
Example 2
The difference from example 1 is that:
the height of the reflective structure substrate 21 of the reflective structure layer 2 is 10um;
the height of the first refractive structure layer 31 in the brightness enhancing module is 10um.
Example 3
The difference from example 1 is that:
the height of the reflective structure substrate 21 of the reflective structure layer 2 is 30um;
the height of the first refractive structure layer 31 in the brightness enhancing module is 30um.
Example 4
The difference from example 1 is that:
in the reflection module, the beta 2 92 DEG, alpha 2 43 °;
in the first refractive structure layer 31, the beta 1 92 DEG, alpha 1 43 °;
the thickness of the second adhesive layer 42 is 8um.
Example 5
The difference from example 4 is that:
in the reflection module, the beta 2 88 DEG, alpha 2 47 °;
in the first refractive structure layer 31, the beta 1 88 DEG, alpha 1 47 deg..
Example 6
The difference from example 4 is that:
in the reflection module, the beta 2 95 DEG, said alpha 2 40 °;
in the first refractive structure layer 31, the beta 1 95 DEG, said alpha 1 40 deg..
Example 7
The difference from example 4 is that:
in the reflection module, the beta 2 85 DEG, said alpha 2 50 °;
in the first refractive structure layer 31, the beta 1 85 DEG, said alpha 1 50 deg..
Example 8
The difference from example 1 is that:
the distance S between the vertex of the prism structure of the reflecting structure layer 2 and the vertex of the prism structure corresponding to the first refraction structure layer 31 in the second direction Y is 5um;
the thickness of the second adhesive layer 42 is 10um.
Example 9
The difference from example 8 is that:
the pitch S between the vertices of the prism structures of the reflective structure layer 2 and the vertices of the prism structures corresponding to the first refractive structure layer 31 in the second direction Y is 10um.
Example 10
The difference from example 8 is that:
the height of the reflective structure substrate 21 of the reflective structure layer 2 is 30um;
the height of the first refraction structure layer 31 in the brightness enhancement module is 30um;
the spacing S between the vertices of the prism structures of the reflective structure layer 2 and the vertices of the prism structures corresponding to the first refractive structure layer 31 in the second direction Y is 6um.
Example 11
The difference from example 8 is that:
the height of the reflective structure substrate 21 of the reflective structure layer 2 is 20um;
the height of the first refraction structure layer 31 in the brightness enhancement module is 20um;
the pitch S between the vertices of the prism structures of the reflective structure layer 2 and the vertices of the prism structures corresponding to the first refractive structure layer 31 in the second direction Y is 10um.
Example 12
The difference from example 1 is that:
in the first refractive structure layer 31, the refractive index n of the first refractive structure layer 31 1 1.7, the second refractive structure layer 32 refracts n 2 1.48;
the thickness of the second adhesive layer 42 is 12um.
Example 13
The difference from example 12 is that:
in the first refractive structure layer 31, the refractive index n of the first refractive structure layer 31 1 1.6, the second refractive structure layer 32 refracts n 2 1.5.
Example 14
The difference from example 12 is that:
in the first refractive structure layer 31, the refractive index n of the first refractive structure layer 31 1 1.7, the second refractive structure layer 32 refracts n 2 1.45, and Δn is 0.25.
Example 15
The difference from example 12 is that:
in the first refractive structure layer 31, the refractive index n of the first refractive structure layer 31 1 1.54, the second refractive structure layer 32 refracts n 2 1.52.
Example 16
The difference from example 1 is that:
the diffusion layer 52 has a haze of 10% and a roughness of 0.5; the thickness of the first substrate layer 11 and the second substrate layer 12 is 25um; the thickness of the first adhesive layer 41 is 3um; the thickness of the reflective layer 22 is 1um;
the thickness of the second adhesive layer 42 is 9um.
Example 17
The difference from example 16 is that:
the diffusion layer 52 has a haze of 50% and a roughness of 0.3; the thickness of the first substrate layer 11 and the second substrate layer 12 is 250um; the thickness of the first adhesive layer 41 is 2um; the thickness of the reflective layer 22 is 3um.
Comparative example 1
The difference from example 1 is that:
in the reflection module, the beta 2 60 DEG, said alpha 2 60 °;
in the first refractive structure layer 31, the beta 1 60 DEG, said alpha 1 60 °;
the thickness of the second adhesive layer 42 is 9um.
Comparative example 2
The difference from example 1 is that:
in the reflection module, the beta 2 60 DEG, said alpha 2 60 °;
in the first refractive structure layer 31, the beta 1 45 DEG, said alpha 1 90 °;
the thickness of the second adhesive layer 42 is 9um.
Test method
Luminance testing: measuring by using a BM-7/SR-3 optical measurement system;
peel force test: the peel force between the brightness enhancing film and the second cling layer was tested as follows:
(1) The experiment is carried out under the conditions of the ambient temperature (23+/-1) DEG C and the relative humidity (50+/-5)%, the composite prism is cut into a rectangle with the length of 25mm multiplied by 180mm, the protective film is removed, and the upper prism and the lower prism at the edge of the sample are peeled a little;
(2) And sticking the lower surface on a stainless steel plate by using double-sided adhesive (Desha 4972/adhesive with high viscosity is selected) and wiping the steel plate clean by using alcohol;
(3) Clamping the lower side of the prism and the steel plate by using a clamp on a peeling strength tester, and connecting a torn layer with the hook;
(4) Setting the speed of 250mm/min for 180 DEG peeling test;
with constant speed stretching, the automatic recorder records load readings at least every 1mm, removes head and tail data, and takes the average of intermediate data as the result in gf/25mm.
Warpage test: 65 ℃/95% RH 16hr reliability post warp mm, specifically as follows:
(1) Cutting the optical film according to the size of the drawing, assembling the optical film in a liquid crystal backlight module LCM, and sealing shading adhesive tapes around the optical film;
(2) Placing the LCM module in a high-temperature high-humidity experiment machine in a lighting state, setting the experiment condition to 65 ℃/95%, taking out the LCM module after the experiment condition is set for 168hr and 168 hours, observing whether the LCM picture is abnormal, then disassembling the LCM module, horizontally placing the test optical film on a marble platform, standing for 30min, testing the highest warping point of four sides of the optical film by using a steel ruler, and recording the numerical value.
The test results of examples 1-17 and comparative examples 1-2 are as follows:
TABLE 1
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As can be seen from the above experimental results, the optical composite film according to the present application has extremely high luminance gain, and the data of examples 1 to 3 show that the prism structure heights of the reflective structure layer 2 and the first refractive structure layer 31 affect the overall thickness of the composite film, and theoretically, the larger the thickness is, the luminance decreases, but the higher the transmittance of the material itself is, the weaker the effect of the difference in thickness on the optical performance is, and the overall luminance difference is not large; from the data of examples 4 to 7, it is understood that the angle between the prism structures of the reflective structure layer 2 and the refractive structure layer 3 has a larger influence on the optical gain, and the closer the angle is to 45 °, the more closely the optical paths between the refractive structure layer 3 and the reflective structure layer 2 are matched, the easier the total reflection and the front emission are realized, and the better the optical gain is. The data in examples 8 to 11 show that the smaller the spacing s is, the more the optical paths between the reflective structure layer 2 and the refractive structure layer 3 are matched, the easier the light is emitted from the front surface, and the better the optical gain is. The data of examples 12 to 15 show that, to some extent, the larger the refractive index difference between the refractive structure layers 3 is, the higher the optical gain is. In comparative example 1, the prism included angle between the refractive structure layer 3 and the reflective structure layer 2 was 60 °, and due to the mismatch between the included angles, there was no way for light to totally reflect at the interface of the refractive structure layer 3, and the light reflected by the surface of the reflective structure layer 2 was not emitted from the front surface of the optical composite film, but the luminance gain was insufficient. In comparative example 2, the prism angle of the reflective structure layer 2 was 60 °, and the prism angle of the refractive structure layer 3 was 45 °, but most of the light reflected by the reflective structure layer 2 was not matched with the refractive structure layer 3, but was still insufficient compared with comparative example 1, although most of the light reflected by the surface of the refractive structure layer 3 was emitted from the whole surface of the composite film. In summary, through the smart structural arrangement and refractive index matching between the reflective structure layer 2 and the refractive structure layer 3, light is emitted from the front surface of the optical composite film, and the light source device has higher collimation degree and improved brightness when being applied to a display device.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be capable of being practiced otherwise than as specifically illustrated and described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. An optical composite film, characterized in that the optical composite film comprises a substrate layer, a reflecting structure layer (2) and a refracting structure layer (3);
a substrate layer comprising at least a first substrate layer (11) and a second substrate layer (12);
a reflective structure layer (2) provided on one side surface of the first base material layer (11);
the refraction structure layer (3) is arranged on one side surface of the second substrate layer (12), the refraction structure layer (3) comprises a first refraction structure layer (31) and a second refraction structure layer (32), and the first refraction structure layer (31) and the second refraction structure layer (32) are complementarily arranged;
the reflecting structure layer (2), the first refractive structure layer (31) and the second refractive structure layer (32) comprise a plurality of prism structures which are arranged in parallel along a first direction X and are arranged along a second direction Y; the prism structure of the reflecting structure layer (2) and the prism structure of the first reflecting structure layer (31) are arranged in opposite directions;
the prism structure on the first refraction structure layer (31) comprises a light incident surface, a first light emergent surface and a second light emergent surface, and an included angle beta between the light incident surface and the second substrate layer (12) 1 85-95 DEG, the first light-emitting surface is arranged on the surface of the second substrate layer (12), and an included angle alpha between the second light-emitting surface and the light-entering surface 1 40-50 degrees;
the prism structure on the reflecting structure layer (2) comprises a first reflecting surface, a second reflecting surface and a bottom surface, wherein an included angle beta between the first reflecting surface and the first substrate layer (11) 2 Is 85-95 DEG, the bottom surface is arranged on the surface of the first substrate layer (11), and the included angle alpha between the second reflecting surface and the first reflecting surface 2 40-50 deg..
2. An optical composite film according to claim 1, wherein the spacing S between the apexes of the prismatic structures of the reflective structure layer (2) and the apexes of the prismatic structures of the first refractive structure layer (31) in the second direction Y is not more than 50% of the width of the prismatic structures of the first refractive structure layer (31) in the second direction Y.
3. The optical composite film according to claim 1, wherein the second refractive structure layer (32) is disposed to fill a gap between the first refractive structure layers (31), and a surface of the refractive structure layer (3) on a side away from the second substrate layer (12) is a flat surface.
4. An optical composite film according to claim 1, characterized in that the first refractive structure layer (31) has a refractive index n 1 Is greater than the refractive index n of the second refractive structure layer (32) 2 The method comprises the steps of carrying out a first treatment on the surface of the The refractive index n of the first refractive structure layer (31) 1 =1.53 to 1.7, the second refractive structure layer (32) has a refractive index n 2 ＝1.45～1.53。
5. The optical composite film according to claim 1, wherein the reflective structure layer (2) comprises a reflective structure substrate (21) and a reflective layer (22), the reflective structure substrate (21) has a height of 10 to 50um, and the reflective layer (22) has a thickness of 1 to 3um.
6. An optical composite film according to claim 1, wherein the prism structure height of the first refractive structure layer (31) is 10 to 50um.
7. The optical composite film according to claim 1, further comprising a brightness enhancing layer (51) and a diffusion layer (52), wherein the brightness enhancing layer (51) is disposed on a side of the second substrate layer (12) away from the refractive structure layer (3), and the diffusion layer (52) is disposed on a surface of the brightness enhancing layer (51) on a side away from the second substrate layer (12).
8. The optical composite film according to claim 7, further comprising an adhesive layer (4), the adhesive layer (4) comprising a first adhesive layer (41) and a second adhesive layer (42); the first adhesive layer (41) is arranged between the reflective structure layer (2) and the refractive structure layer (3), and the second adhesive layer is arranged between the brightness enhancement layer (51) and the second base material layer (12).
9. The optical composite film according to claim 7, wherein the haze of the diffusion layer (52) is 10% to 50%; refractive index n of the diffusion layer (52) 3 1.47 to 1.53.
10. A display device, wherein the optical composite film according to any one of claims 1 to 9 is applied to the display device.
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