CN108873126B - Optical film, backlight module and display device - Google Patents
Optical film, backlight module and display device Download PDFInfo
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- CN108873126B CN108873126B CN201810667886.3A CN201810667886A CN108873126B CN 108873126 B CN108873126 B CN 108873126B CN 201810667886 A CN201810667886 A CN 201810667886A CN 108873126 B CN108873126 B CN 108873126B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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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
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The invention provides an optical film, which is arranged above a diffusion sheet, comprises a brightness enhancement sheet and further comprises: the light control film is arranged on one side of the brightness enhancement film facing the diffusion sheet, and a low refractive index part and a high refractive index part with the refractive index higher than that of the low refractive index part are formed on the light control film; wherein, the adjacent low refractive index parts are provided with corresponding intervals; the high-refraction-rate part is arranged in each interval between the adjacent low-refraction-rate parts, and the high-refraction-rate part in each interval can reflect the incident light with the angle lower than the preset angle in the direction from the diffusion sheet to the brightness enhancement sheet to form emergent light with the angle within a limited range and directly transmit the incident light with the angle higher than the preset angle. By implementing the invention, the diffusion of small-angle incident light in the range of an emergent angle can be realized, so that the problem that the small-angle incident light is difficult to take out and utilize caused by the existing microstructure brightness enhancement film is solved, and the aims of improving the front brightness of a surface light source and improving the light energy utilization rate are fulfilled.
Description
Technical Field
The invention relates to the technical field of display, in particular to an optical film, a backlight module and a display device.
Background
The Mini-LED area light source is often made into flexible display backlight, and due to the display advantage of a narrow frame in the full-screen display technology, the Mini-LED area light source is also often made into anisotropic backlight for the field of anisotropic display, so that the Mini-LED area light source becomes one of the key fields of the research of the current display industry.
The Mini-LED surface light source mainly comprises a Mini-LED light source, a light guide plate, an optical film, a plastic frame and the like, and is usually used for providing a reliable light source for a display panel due to the characteristics of high brightness, long service life, uniform light emission and the like. In the Mini-LED area light source, after light rays emitted by the Mini-LED light source enter the light guide plate, the light rays are uniformly taken out through the net points at the bottom of the light guide plate, and a certain number of optical films are placed on the upper surface of the light guide plate to increase the brightness and make the light distribution more uniform, so that color spots can be shielded or the brightness can be increased. In the existing design, the optical film placed on the upper surface of the light guide plate generally comprises a brightness enhancement film, a diffusion film and the like, but on the existing brightness enhancement film adopting the microstructure design, the apex angle of the brightness enhancement film is usually set to be 90 degrees, so that the brightness enhancement film is not very beneficial to the extraction and utilization of small-angle incident light in a surface light source, and the utilization rate of the light energy on the front surface of the surface light source is greatly reduced.
Therefore, it is necessary to solve the problem that the small-angle incident light is difficult to take out and utilize due to the existing microstructure brightness enhancement film, so that the small-angle incident light can be diffused to the range of the emergence angle to emit light from the existing microstructure brightness enhancement film, thereby improving the front brightness of the surface light source and improving the light energy utilization rate.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide an optical film, a backlight module and a display device, which can implement the diffusion of small-angle incident light in the range of the exit angle, thereby solving the problem that the small-angle incident light is difficult to take out and utilize due to the existing microstructure brightness enhancement film, and achieving the purposes of improving the front brightness of a surface light source and increasing the light energy utilization rate.
In order to solve the above technical problem, an embodiment of the present invention provides an optical film, disposed above a diffusion sheet, including a brightness enhancement film, and further including: the light control film is arranged on one side, facing the diffusion sheet, of the brightness enhancement film, and a low-refractive-index part and a high-refractive-index part with the refractive index higher than that of the low-refractive-index part are formed on the light control film; wherein the content of the first and second substances,
corresponding intervals are reserved between adjacent low refractive index parts;
the high-refraction-rate part is arranged in each interval between the adjacent low-refraction-rate parts, and the high-refraction-rate part in each interval can reflect the incident light with the angle lower than the preset angle in the direction from the diffusion sheet to the brightness enhancement sheet to form emergent light with the angle within a limited range and directly transmit the incident light with the angle higher than the preset angle.
Wherein the reserved space between adjacent low refractive index parts is defined by the formula
Calculating the distance range; wherein d is a reserved space between adjacent low refractive index parts; theta is within the range [20 DEG, 40 DEG ]]An angle of the inner; lambda is the wavelength of white light, and the value range is 380 nm-780 nm; n is the number of wavelengths, n =1 or 2.
Wherein the calculated distance ranges from 600 μm to 2300 μm.
The reserved space between the adjacent low refractive index parts is unequal, and the structures of the adjacent low refractive index parts are different.
Wherein the structure of the low refractive index part is spindle-shaped, ellipsoid-shaped, spherical, conical or cuboid-shaped; the low refractive index parts are arranged along the thickness direction of the light control membrane and form an included angle with the thickness direction of the light control membrane at [5 degrees, 10 degrees ], and the end faces of the two ends of the low refractive index parts are respectively flush with the side face of the light control membrane facing one side of the brightness enhancement film and the side face of the light control membrane far away from one side of the brightness enhancement film.
Wherein the content of the low refractive index part is 20-30%, and the content of the high refractive index part is 70-80%.
The low refractive index part is made of polymethyl methacrylate (PMMA), polyethylene and polyvinyl chloride; the high-refraction portion is made of Polycarbonate (PC) and polyethylene terephthalate (PET).
The side surface of the light control diaphragm facing to the side of the brightness enhancement film is provided with an upper protective film layer, and the side surface of the light control diaphragm far away from the side of the brightness enhancement film is provided with a lower protective film layer.
The embodiment of the invention also provides a backlight module which comprises the optical film.
The embodiment of the invention also provides a display device, which comprises the backlight module.
The embodiment of the invention has the following beneficial effects: the light control film is integrated on the brightness enhancement film, and the high-refraction-rate part filled in each interval can reflect the incident light with the angle lower than the preset angle from the diffusion film to the brightness enhancement film to form the emergent light with the angle within the limited range and directly transmit the incident light with the angle higher than the preset angle by setting the interval between the low-refraction-rate parts on the light control film, so that the diffusion of the small-angle incident light in the range of the emergent angle is realized, the problem that the small-angle incident light is difficult to take out and utilize due to the existing microstructure brightness enhancement film is solved, and the aims of improving the front brightness of a surface light source and improving the light energy utilization rate are fulfilled.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic partial cross-sectional view of an optical film according to a first embodiment of the present invention;
fig. 2 is an application scene diagram of a light control film in an optical film according to a first embodiment of the present invention, where small-angle incident light is reflected and then diffused into large-angle emergent light;
fig. 3 is an application scene diagram of the light control film in the optical film according to the first embodiment of the present invention, where the light control film realizes direct transmission of large-angle incident light;
FIG. 4 is a schematic diagram of another partial cross-sectional structure of an optical film according to one embodiment of the present disclosure;
fig. 5 is a schematic partial cross-sectional view of a backlight module according to a second embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, in a first embodiment of the present invention, an optical film provided by the inventor is disposed above a diffusion sheet (not shown), and includes a light enhancement film 1, and further includes: a light control film 2 disposed on one side of the brightness enhancement film 1 facing the diffusion sheet, and the light control film 2 is formed with a low refractive index portion 21 and a high refractive index portion 22 having a refractive index higher than that of the low refractive index portion 21; wherein, the material adopted by the low refractive index part 21 comprises polymethyl methacrylate (PMMA), polyethylene and polyvinyl chloride; the high-refraction portion 22 is made of polycarbonate PC or polyethylene terephthalate PET;
corresponding intervals are reserved between adjacent low refractive index parts 21;
the high refractive index portions 22 are disposed in each interval between adjacent ones of the low refractive index portions 21, and the high refractive index portions 22 in each interval can reflect the incident light having an angle lower than a predetermined angle in the direction from the diffusion sheet to the brightness enhancement sheet 1 to the emergent light having an angle within a limited range and directly transmit the incident light having an angle higher than the predetermined angle.
It should be noted that the angle of the incident light and the emergent light refers to the angle between the light ray and the normal. The brightness enhancement film 1 is used as a reference, and the angle of the incident light and the emergent light is the included angle between the light and the normal perpendicular to the direction of the brightness enhancement film 1.
In the first embodiment of the present invention, since the light utilization rate of the light within the polar angle range of ± 20 ° is low, and the light within the angular range is reflected for multiple times, so that the energy loss is large, the distance between adjacent low refractive index portions 21 is set, so that the small-angle incident light (e.g. angle < 20 ° of the predetermined angle) passing through the high refractive index portion 22 in each distance from the diffusion sheet to the brightness enhancement sheet can reflect the large-angle emergent light within the limited range [20 °,40 ° ] while maintaining the direct transmission of the incident light having an angle higher than the predetermined angle (e.g. angle > = 20 °).
In one embodiment, as shown in fig. 2, the incident light is a light perpendicular to the direction of the brightness enhancement film 1, that is, the angle of the incident light is 0 °, the incident light is totally reflected by two high-refraction-rate portions 22 arranged at intervals between the middle three low-refraction-rate portions 21, and is diffused to form a large-angle emergent light at an angle between [20 ° and 40 ° ], that is, when the incident light is incident at a small angle, part of the incident light is totally reflected when passing through the high-refraction-rate portions 22, and finally is emitted in a large-angle direction, so that the diffusion from the small-angle light to the large.
In another embodiment, as shown in fig. 3, the incident light is a light having a large angle with a normal perpendicular to the direction of the brightness enhancement film 1, that is, the angle of the incident light is higher than 20 °, and the incident light is directly transmitted through the low refractive index portion 21 and the high refractive index portion 22, that is, when the incident light is incident in the large-angle direction, the incident light does not reach the total reflection angle in the low refractive index portion 21 and the high refractive index portion 22, so that the light-emitting direction is substantially parallel to the incident direction, and the large-angle light diffusion degree is ensured to be small.
In the first embodiment of the present invention, the distance reserved between adjacent low refractive index portions 21 may be limited to [20 °,40 ° ]]White light wavelength and a fixed number of wavelengths. For example, the reserved space between adjacent low refractive index portions 21 can be expressed by the formula
The distance d reserved between the adjacent low refractive index parts 21 is within the distance range 600-2300 μm calculated by the formula, and the angle of emergent light is [20 DEG, 40 DEG ]]To (c) to (d); wherein d is a space reserved between adjacent low refractive index portions 21; theta is within a limited range of [20 DEG, 40 DEG ]]An angle of the inner; lambda is the wavelength of white light, and the value range is 380 nm-780 nm; n is the number of wavelengths, n =1 or 2.
In the first embodiment of the present invention, in order to prevent moire, the reserved intervals between adjacent low refractive index portions 21 may be set to be different, and the structures between adjacent low refractive index portions 21 may be set to be different; the structure of the low refractive index portion 21 includes, but is not limited to, a spindle shape, an ellipsoid shape, a spherical shape, a conical shape, a rectangular parallelepiped shape, and the like.
In the first embodiment of the present invention, the thickness of the light control film 2, the content ratio of the low refractive index portions 21, and the arrangement direction of the orientation structures thereof are controlled by the manufacturing process, so that the diffusion ratio of light emitted from different angles of the light control film 2 can be better controlled, and thus suitable film parameters can be obtained. In one embodiment, the low refractive index portions 21 are arranged along the thickness direction (i.e. the light input and output direction) of the light control film sheet 2, and the included angle formed between the low refractive index portions 21 and the thickness direction of the light control film sheet 2 is [5 °,10 ° ], and the end surfaces of the two ends of the low refractive index portions 21 are respectively flush with the side surface of the light control film sheet 2 facing the brightness enhancement film 1 and the side surface of the light control film sheet away from the brightness enhancement film 1; the content ratio of the low refractive index part 21 is set to be 20-30%, the content ratio of the high refractive index part 22 is set to be 70-80%, and the thickness of the light control film 2 is set to be 50-100 μm.
In the first embodiment of the present invention, in order to protect the light-controlling film, an upper protective film layer 23 is further provided on the side of the light-controlling film 2 facing the brightness enhancement film 1, and a lower protective film layer 24 is further provided on the side facing away from the brightness enhancement film 1 (as shown in fig. 4). Of course, the total thickness of the time-control light film is controlled between 100 μm and 200 μm.
Corresponding to the optical film of the first embodiment of the present invention, in the second embodiment of the present invention, the inventor further provides a backlight module including the optical film of the first embodiment of the present invention. Since the optical film in the second embodiment of the present invention and the optical film in the first embodiment of the present invention have the same structure and connection relationship, please refer to the related contents in the first embodiment of the present invention, which is not described in detail herein.
In one embodiment, as shown in fig. 5, the backlight module includes a substrate 100, an LED chip 200, a fluorescent film 300, a diffusion sheet 400, and an optical film 500 integrated with a light control film sheet 2 and a brightness enhancement film 1; wherein the content of the first and second substances,
the LED chip 200 is fixed on the substrate 100 by the solder paste on the pad;
the fluorescent film 300 is formed by mixing fluorescent powder, silica gel and haze particles, is flatly adhered to the substrate 100 through a film pressing and curing process, and covers the LED chip 200;
the diffusion sheet 400 is disposed above the fluorescent film 300, and mainly diffuses light on the surface of the planar light source uniformly;
the optical film 500 is disposed above the diffusion sheet 400, the light control film 2 is attached to the diffusion sheet 400, and the light emitted from a small angle range is diffused to a large angle range through the light control film 2, and further the light receiving angle of the brightness enhancement film 1 is matched, so as to improve the light extraction efficiency and brightness of the front surface light source.
Similarly, in a third embodiment of the present invention, corresponding to the backlight module in the second embodiment of the present invention, the inventor further provides a display device including the backlight module in the second embodiment of the present invention. Since the backlight module in the third embodiment of the present invention and the backlight module in the second embodiment of the present invention have the same structure and connection relationship, please refer to the related contents in the second embodiment of the present invention, which is not described herein again.
The embodiment of the invention has the following beneficial effects: the light control film is integrated on the brightness enhancement film, and the high-refraction-rate part filled in each interval can reflect the incident light with the angle lower than the preset angle from the diffusion film to the brightness enhancement film to form the emergent light with the angle within the limited range and directly transmit the incident light with the angle higher than the preset angle by setting the interval between the low-refraction-rate parts on the light control film, so that the diffusion of the small-angle incident light in the range of the emergent angle is realized, the problem that the small-angle incident light is difficult to take out and utilize due to the existing microstructure brightness enhancement film is solved, and the aims of improving the front brightness of a surface light source and improving the light energy utilization rate are fulfilled.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (9)
1. An optical film is arranged above a diffusion sheet, comprises a brightness enhancement sheet and is characterized by further comprising: the light control film is arranged on one side, facing the diffusion sheet, of the brightness enhancement film, and a low-refractive-index part and a high-refractive-index part with the refractive index higher than that of the low-refractive-index part are formed on the light control film; wherein the content of the first and second substances,
corresponding intervals are reserved between adjacent low refractive index parts;
the high-refraction-rate part is arranged in each interval between the adjacent low-refraction-rate parts, and the high-refraction-rate part in each interval can reflect the incident light with the angle lower than the preset angle in the direction from the diffusion sheet to the brightness enhancement sheet to form emergent light with the angle within a limited range and directly transmit the incident light with the angle higher than the preset angle;
wherein, theThe reserved space between adjacent low refractive index parts is defined by the formula
Calculating the distance range; wherein d is a reserved space between adjacent low refractive index parts; theta is within the range [20 DEG, 40 DEG ]]An angle of the inner; lambda is white light wavelength and the value range is 380 nm-780 nm; n is the number of wavelengths, and n is 1 or 2.
2. The optical film of claim 1, wherein the calculated distance is in the range of 600 μ ι η to 2300 μ ι η.
3. The optical film as claimed in claim 2, wherein the spacing between adjacent ones of the low refractive indices is varied and the structure between adjacent ones of the low refractive indices is varied.
4. The optical film according to claim 3, wherein the low refractive index portion has a spindle, ellipsoid, spherical, conical or rectangular parallelepiped structure; the low refractive index parts are arranged along the thickness direction of the light control membrane and form an included angle with the thickness direction of the light control membrane at [5 degrees, 10 degrees ], and the end faces of the two ends of the low refractive index parts are respectively flush with the side face of the light control membrane facing one side of the brightness enhancement film and the side face of the light control membrane far away from one side of the brightness enhancement film.
5. The optical film as claimed in claim 4, wherein the low refractive index portion is 20% to 30% and the high refractive index portion is 70% to 80%.
6. The optical film of claim 5, wherein the low refractive index portion is made of a material selected from the group consisting of Polymethylmethacrylate (PMMA), polyethylene, and polyvinyl chloride; the high-refraction portion is made of Polycarbonate (PC) and polyethylene terephthalate (PET).
7. The optical film of claim 6, wherein the light-controlling film is further provided with an upper protective film layer on a side facing the light-adding sheet and a lower protective film layer on a side facing away from the light-adding sheet.
8. A backlight module comprising the optical film as claimed in any one of claims 1 to 7.
9. A display device comprising a backlight module as claimed in claim 8.
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| CN201810667886.3A CN108873126B (en) | 2018-06-26 | 2018-06-26 | Optical film, backlight module and display device |
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| CN201810667886.3A CN108873126B (en) | 2018-06-26 | 2018-06-26 | Optical film, backlight module and display device |
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| CN108873126A CN108873126A (en) | 2018-11-23 |
| CN108873126B true CN108873126B (en) | 2021-04-30 |
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| CN116819825A (en) * | 2023-04-18 | 2023-09-29 | 惠科股份有限公司 | Light control, backlight module and display device |
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