CN115083260A - Light-gathering film, backlight module and display panel - Google Patents
Light-gathering film, backlight module and display panel Download PDFInfo
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- CN115083260A CN115083260A CN202210878426.1A CN202210878426A CN115083260A CN 115083260 A CN115083260 A CN 115083260A CN 202210878426 A CN202210878426 A CN 202210878426A CN 115083260 A CN115083260 A CN 115083260A
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- light
- wavelength optical
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- pet base
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
Abstract
The invention discloses a light-gathering film, a backlight module and a display panel. The light condensing film includes: the PET base film and locate the triangular prism on the PET base film, the play plain noodles of triangular prism and the income plain noodles of PET base film all are equipped with the secondary wavelength optical microstructure of array distribution, the linear dimension of secondary wavelength optical microstructure is in 380nm, secondary wavelength optical microstructure perpendicular to goes out the plain noodles or goes into the plain noodles and sets up, wherein, it is medium interface to go out plain noodles and income plain noodles, medium interface is the contact surface of two carriers, secondary wavelength optical microstructure is being more narrow than the one end that is close to PET base film or triangular prism in the one end of keeping away from PET base film or triangular prism. The beneficial effect of this application is: set up sub-wavelength optical microstructure through the income plain noodles at the play plain noodles of triangular prism and PET base film, effectual reflection phenomenon and the loss of reflection light energy of avoiding, very big promotion the light-emitting efficiency and the spotlight effect of concentrating film.
Description
Technical Field
The invention relates to the technical field of display devices, in particular to a light-gathering film, a backlight module and a display panel.
Background
The light-gathering film is one of the core optical components in the backlight module, and mainly comprises a PET base film and a triangular prism structure, wherein the triangular prism structure is generally formed by impressing acrylic resin. According to the refraction and reflection principle of light, the direction of incident light is corrected by using the light-gathering film, so that the light is concentrated on the front side, the light which is not utilized outside the visual angle can be recycled, the integral brightness and the uniformity are improved, and the effect of brightening is achieved.
In the existing condensing film, a certain ratio of reflected light energy exists on the light incident surface (PET base film) and the light emergent surface (surface of a triangular prism), so that the light emergent efficiency is low. The incident surface of the PET base film and the emergent surface of the triangular prism structure form reflection loss light energy, and the fundamental reason is that when the light energy is transmitted at the interface between two media, the refractive index changes suddenly, so that the light-emitting efficiency of the light-gathering film is low. Therefore, in order to improve the brightness of the backlight module, only the brightness of the light source can be optimized, and only the light energy lost by reflection can be wasted.
Disclosure of Invention
The invention aims to provide a light condensing film, a backlight module and a display panel.
The condensing film provided by the embodiment of the invention comprises a PET (polyethylene terephthalate) base film and a triangular prism arranged on the PET base film, wherein sub-wavelength optical microstructures distributed in an array mode are arranged on a light outlet surface of the triangular prism and a light inlet surface of the PET base film, the linear size of each sub-wavelength optical microstructure is within 380nm, the sub-wavelength optical microstructures are arranged perpendicular to the light outlet surface or the light inlet surface, the light outlet surface and the light inlet surface are both medium interfaces, the medium interfaces are contact surfaces of two carriers, and one end of each sub-wavelength optical microstructure far away from the PET base film or the triangular prism is narrower than one end of each sub-wavelength optical microstructure close to the PET base film or the triangular prism.
According to the light condensing film provided by the embodiment of the invention, the light outlet surface of the triangular prism and the light inlet surface of the PET base film are respectively provided with the sub-wavelength optical microstructures distributed in an array manner, so that when light energy is transmitted to the light condensing film from a medium, the light energy is along the depth direction of the sub-wavelength optical microstructures, the refractive index is monotonous, gentle and gradually changed, and the linear size of the sub-wavelength optical microstructures is smaller than 380nm and in the sub-wavelength range, and the linear size and the arrangement distance of the sub-wavelength optical microstructures are far smaller than those of visible light waves, so that the visible light waves cannot be identified, and the purposes of avoiding reflection phenomena and reflection light energy loss are further achieved. The loss of the reflected light energy through the light-gathering film is greatly improved. Thereby realized promoting the technological effect of spotlight membrane light-emitting efficiency and spotlight effect.
The light-gathering film provided by the embodiment of the invention also has the following additional technical characteristics:
preferably, the cross section of the sub-wavelength optical microstructure is any one of a conical shape, a gaussian curved surface shape, a parabolic shape and a step surface shape.
Preferably, the distance between adjacent sub-wavelength optical microstructures is not more than 150nm, and the aspect ratio of the sub-wavelength optical microstructures is not less than 2.
Preferably, the sub-wavelength optical microstructures are integrally formed by embossing.
Preferably, the material of the sub-wavelength optical microstructure is resin glue, the sub-wavelength optical microstructure is coated on the light incident surface of the PET base film and the light emergent surface of the prism, and the PET base film and the prism are subjected to stamping and forming through a mold.
Preferably, the sub-wavelength optical microstructure is cured by irradiation of a UV light source after imprint molding.
The embodiment of the invention also provides a backlight module which comprises a light source, a light guide plate, an optical film and a back plate, wherein the surface of the light guide plate is provided with the light condensing film.
The embodiment of the invention also provides a display panel which comprises the backlight module.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram illustrating the optical energy loss of a conventional condensing film;
fig. 2 is a schematic structural diagram of a light-condensing film according to an embodiment of the present invention;
FIG. 3 is an optical schematic diagram of a light-condensing film according to an embodiment of the present invention;
FIG. 4 is a schematic view of a light-gathering film according to a third embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a light-condensing film according to a fourth embodiment of the present invention;
fig. 6 is a schematic structural diagram of a light-condensing film according to a fifth embodiment of the present invention.
Description of the drawings:
a light-gathering film-10, a PET base film-11, a triangular prism-12 and a sub-wavelength optical microstructure-13.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as referred to herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
The condensing film is one of the core optical components in the backlight module, and mainly comprises a PET base film and a triangular prism structure, wherein the triangular prism structure is generally formed by stamping acrylic resin. According to the refraction and reflection principle of light, the direction of incident light is corrected by using the light-gathering film, so that the light is concentrated on the front side, the light which is not utilized outside the visual angle can be recycled, the integral brightness and the uniformity are improved, and the effect of brightening is achieved.
In the existing condensing film, a certain ratio of reflected light energy exists on the light incident surface (PET base film) and the light emergent surface (surface of a triangular prism), so that the light emergent efficiency is low. The incident surface of the PET base film and the emergent surface of the triangular prism structure form reflection loss light energy, and the fundamental reason is that when the light energy is transmitted at the interface between two media, the refractive index changes suddenly, so that the light-emitting efficiency of the light-gathering film is low. Fig. 1 is a schematic diagram showing the loss of light energy of a conventional condensing film. As shown in the figure, the light-gathering film receives light energy from the backlight module, the refractive index of air is set to be N1, the refractive index of the PET base film is set to be N2, and the refractive index of the triangular prism structure layer is set to be N3, generally, N1 ≈ 1, N2 ≈ 1.3, and N3 ≈ 1.5. Incident light energy is reflected and refracted at a medium interface between the PET base film and air, and the reflectivity is set to be R1, then:
i.e., the primary reflection loses about 1.7% of the incident light energy; the light energy is totally reflected and refracted at the medium interface of the triangular prism structure and the air, and the critical angle of total reflection is set as C, then
That is, for the light energy emergent point of a triangular prism structure, the light energy emergent point has
The incident light energy has a certain ratio of light energy loss in the light-condensing film due to the existence of reflection and total reflection.
Therefore, the invention provides a light-gathering film to overcome the problems in the prior art.
Example 1
Referring to fig. 2, for a light-condensing film 10 according to a first embodiment of the present invention, the light-condensing film 10 includes a PET base film 11 and triangular prisms 1212 disposed on the PET base film 11, the light-emitting surface of the triangular prism 12 and the light-incident surface of the PET base film 11 are provided with sub-wavelength optical microstructures 1313 distributed in an array, the linear size of the sub-wavelength optical microstructure 13 is less than 380nm, the sub-wavelength optical microstructure 13 is arranged perpendicular to the light emergent surface or the light incident surface, wherein the light emergent surface and the light incident surface are both medium interfaces, the medium interfaces are contact surfaces of two carriers, the section of the sub-wavelength optical microstructure 13 is in a Gaussian surface shape, the outer surface is in a monotone gradual change form, the upper end of the optical microstructure 13 is narrow, the lower end of the optical microstructure is wide, and specifically, the end of the optical microstructure 13 far away from the PET base film 11 or the triangular prism 12 is narrower than the end of the optical microstructure close to the PET base film 11 or the triangular prism 12.
It should be noted that: a medium, a carrier of the transfer of optical energy. The medium interface is the contact surface of the two carriers, and the refractive index change occurs at the medium interface. In this application, the dielectric interface includes air → PET base film and triangular prism → air.
In the light condensing film 10 provided in embodiment 1 of the present invention, the light-emitting surface of the triangular prism 12 and the light-incident surface of the PET base film 11 are respectively provided with the sub-wavelength optical microstructures 13 distributed in an array, so that when light energy is transmitted from a medium to the light condensing film 10, the refractive index of the light energy is monotonous, gentle and gradually changed along the depth direction of the sub-wavelength optical microstructures 13, and since the size of the sub-wavelength optical microstructures 13 is smaller than 380nm, the linear size of the sub-wavelength optical microstructures is in the sub-wavelength range, and the linear size and the arrangement pitch of the sub-wavelength optical microstructures are both far smaller than those of visible light waves, the visible light waves cannot be identified, and thus the purposes of avoiding a reflection phenomenon and loss of reflected light energy are achieved. So that the loss of the reflected light energy passing through the condensing film 10 is greatly improved. Thereby realizing the technical effects of improving the light-emitting efficiency and the light-gathering effect of the light-gathering film 10.
It can be understood that the arrangement of the sub-wavelength optical microstructure 13 perpendicular to the light emitting surface or the light incident surface in the embodiment of the present invention is for the purpose of avoiding the reflection phenomenon and the loss of the reflected light energy. In the embodiment of the present invention, the sub-wavelength optical microstructure 13 may be perpendicular to the medium interface to achieve the purpose of avoiding the reflection phenomenon and the loss of the reflected light energy, and the specific application field of the sub-wavelength optical microstructure 13 is not particularly limited in the present invention.
Specifically, the optical principle of the light-condensing film 10 is as shown in fig. 3, and light can be directed from the medium N1 to the light-condensing filmMedium N2 propagates, medium N2 has convex subwavelength optical microstructure 13 on its surface, along the light energy propagation direction, subwavelength optical microstructure 13 is divided into S1, S2, S3, and S4. N is a radical of hydrogen sub N1 × 1+ N2 × 2, x1 and x2 are the area ratios of the media N1 and N2 in the Sx plane, respectively, so that the refractive index is monotonous, gentle and gradual along the depth direction of the subwavelength optical microstructure 13, and since the subwavelength optical microstructure 13 belongs to the category of subwavelength, the linear size and the arrangement pitch of the subwavelength optical microstructure are far smaller than those of visible light, the visible light cannot be identified, and thus the reflection phenomenon and the reflection loss of light energy are avoided.
Preferably, in embodiment 1 of the present invention, in order to avoid a reflection phenomenon of visible light between adjacent sub-wavelength optical microstructures 13, a pitch between adjacent sub-wavelength optical microstructures 13 is not greater than 150 nm.
Furthermore, there is a most fundamental cause of reflection, which is an abrupt change in refractive index between media. Since the abrupt change of the refractive index causes the increase of the reflectivity, in the embodiment 1 of the present invention, the aspect ratio of the sub-wavelength optical microstructure 13 is not less than 2, and the change of the refractive index along the depth direction of the microstructure is made more gradual by defining the aspect ratio of the sub-wavelength optical microstructure 13.
Preferably, in embodiment 1 of the present invention, the sub-wavelength optical microstructure 13 is integrally formed by stamping with a mold, and then cured by irradiation of a UV light source, so as to improve the forming and shaping rate of the sub-wavelength optical microstructure 13.
Example 2
The specific structure of the light-condensing film 10 proposed in embodiment 2 of the present invention is substantially the same as that of the light-condensing film 10 proposed in embodiment 1, except that the sub-wavelength optical microstructure 13 uses resin glue as a base material, and the refractive index of the resin glue is close to that of the PET base film 11. The sub-wavelength optical micro-structure 13 is formed by coating resin glue on the surface of the light-gathering film 10 (the light incident surface of the PET base film 11 and the light emergent surface of the prism) and then embossing by using a mold, and compared with the technical scheme of the embodiment 1, the forming efficiency of the sub-wavelength optical micro-structure 13 on the surface of the light-gathering film 10 is higher.
Example 3
Referring to fig. 4, a light-condensing film 10 according to embodiment 3 of the present invention is shown, where embodiment 3 of the present invention is substantially the same as the light-condensing film 10 according to embodiment 1, except that the cross-section of the sub-wavelength optical microstructure 13 in embodiment 3 of the present invention is conical.
Example 4
Referring to fig. 5, a condensing film 10 according to embodiment 4 of the present invention is shown, where the specific structure of the condensing film 10 according to embodiment 4 of the present invention is substantially the same as that of the condensing film 10 according to embodiment 1, and the difference is that the cross section of the sub-wavelength optical microstructure 13 according to embodiment 4 of the present invention is specifically parabolic.
Example 5
Referring to fig. 6, a light-condensing film 10 according to embodiment 5 of the present invention is shown, where embodiment 5 of the present invention is substantially the same as the light-condensing film 10 according to embodiment 1, except that the cross section of the sub-wavelength optical microstructure 13 according to embodiment 5 of the present invention is a step-shaped cross section.
It can be understood that the shapes of the sub-wavelength optical microstructures 13 in the embodiment 1, the embodiment 3, the embodiment 4, and the embodiment 5 are different, but are all microstructure patterns that are relatively easy to be realized in the manufacturing process, and the realized anti-refraction effect is equivalent. In the embodiment of the present invention, the shape of the wavelength optical microstructure may also be other convex structures with a monotonous and gradual change surface, which is not specifically limited in the present invention.
The backlight module provided by the embodiment of the invention comprises a light source, a light guide plate, an optical film and a back plate, wherein the surface of the light guide plate is provided with the light condensing film 10 provided by the embodiment, and the backlight module has a good light condensing effect by adopting the light condensing film 10, so that the brightness requirement on the light source is reduced, and the energy consumption and the backlight brightness of the backlight module are well optimized.
The embodiment of the invention also provides a display panel, which comprises the backlight module provided by the embodiment, and the specific structure is not described again.
In summary, according to the light-condensing film, the backlight module and the display panel provided by the embodiment of the invention, the light-condensing film 10 has the sub-wavelength optical microstructure 13, so that the loss of reflected light energy passing through the light-condensing film 10 is greatly improved; by means of the technical means of embossing and forming the sub-wavelength optical microstructures 13, forming and shaping efficiency of the light-gathering film 10 is effectively improved; by adopting the backlight module and the display panel made of the light-gathering film 10, the energy consumption and the backlight brightness are well optimized.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The utility model provides a light-gathering film, includes the PET base film and locates triangular prism on the PET base film, a serial communication port, the play plain noodles of triangular prism and the income plain noodles of PET base film all is equipped with array distribution's secondary wavelength optical microstructure, secondary wavelength optical microstructure's linear dimension is in 380nm, secondary wavelength optical microstructure perpendicular to go out the plain noodles or go into the plain noodles and set up, secondary wavelength optical microstructure is keeping away from the PET base film or the one end of triangular prism is narrower in being close to the PET base film or the one end of triangular prism.
2. The light concentrating film according to claim 1, wherein the sub-wavelength optical microstructure has a cross section in any one of a conical shape, a gaussian curved shape, a parabolic shape, and a stepped shape.
3. The concentrating film of claim 1 wherein the spacing between adjacent sub-wavelength optical microstructures is no greater than 150nm and the aspect ratio of the sub-wavelength optical microstructures is no less than 2.
4. The condensing film of claim 1, wherein; the sub-wavelength optical microstructures are integrally formed by embossing.
5. The light concentrating film as claimed in claim 1, wherein the sub-wavelength optical microstructures are made of resin glue, are coated on the light incident surface of the PET base film and the light emergent surface of the triple prism, and are formed by die stamping.
6. The concentrating film of claim 4 or claim 5 wherein the sub-wavelength optical microstructures are cured by irradiation with a UV light source after embossing.
7. A backlight module comprising a light source, a light guide plate and a back plate, wherein the surface of the light guide plate is provided with the light-condensing film according to any one of claims 1 to 6.
8. A display panel comprising the backlight module according to claim 7.
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| CN202210878426.1A CN115083260A (en) | 2022-07-25 | 2022-07-25 | Light-gathering film, backlight module and display panel |
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| CN202210878426.1A CN115083260A (en) | 2022-07-25 | 2022-07-25 | Light-gathering film, backlight module and display panel |
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