CN113204064B - Backlight film group, preparation method thereof and liquid crystal display device - Google Patents
Backlight film group, preparation method thereof and liquid crystal display device Download PDFInfo
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- CN113204064B CN113204064B CN202110498451.2A CN202110498451A CN113204064B CN 113204064 B CN113204064 B CN 113204064B CN 202110498451 A CN202110498451 A CN 202110498451A CN 113204064 B CN113204064 B CN 113204064B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 22
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims abstract description 196
- 239000002245 particle Substances 0.000 claims description 77
- 239000003292 glue Substances 0.000 claims description 43
- 239000007788 liquid Substances 0.000 claims description 40
- 238000000576 coating method Methods 0.000 claims description 33
- 239000011259 mixed solution Substances 0.000 claims description 32
- 239000011248 coating agent Substances 0.000 claims description 31
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical group O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 23
- 235000010215 titanium dioxide Nutrition 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 230000000873 masking effect Effects 0.000 claims description 3
- 241000519995 Stachys sylvatica Species 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 9
- 230000006872 improvement Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- 238000001755 magnetron sputter deposition Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
- G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Dispersion Chemistry (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
The invention provides a diffusion film, a preparation method thereof and liquid crystal display equipment, relates to the technical field of display, and aims to solve the technical problem that when an outer shell is deformed, friction is generated between the diffusion film and a brightness enhancement film to damage the brightness enhancement film, so that a display screen has display white spots. The diffusion film provided by the invention comprises: the backlight module comprises a transparent base layer, a first diffusion layer, a shielding layer and a second diffusion layer, wherein the transparent base layer is provided with a first surface and a second surface which are opposite, the shielding layer is formed on the first surface, the shielding layer is provided with the first diffusion layer, the hardness of the first diffusion layer is smaller than that of the shielding layer, and the first diffusion layer faces towards a light enhancement film of the backlight module; a second diffusion layer is formed on the second surface. The shielding layer is prevented from being in direct contact with the brightness enhancement film, when the outer shell deforms to extrude the inside backlight module, friction damage of the diffusion film to the brightness enhancement film is reduced, accordingly display white point problems of the display screen are reduced, and normal use of the liquid crystal display device is facilitated.
Description
Technical Field
The invention relates to the technical field of display, in particular to a diffusion film, a preparation method thereof and liquid crystal display equipment.
Background
The advent of liquid crystal display devices such as smartphones, tablet computers, etc. has brought great convenience to people's life. The liquid crystal display device generally includes a display screen, a housing body, and a backlight module, wherein the display screen and the housing body form a mounting space in which the backlight module is accommodated.
The backlight module generally includes a diffusion film and a brightness enhancement film stacked together, and the diffusion film has a hardness generally greater than that of the brightness enhancement film.
However, the inside backlight module is easy to squeeze when the outer shell is deformed, so that friction is generated between the diffusion film and the brightness enhancement film, the brightness enhancement film is damaged, the display white point problem occurs on the display screen, and the normal use of the liquid crystal display device is affected.
Disclosure of Invention
The invention provides a diffusion film, a preparation method thereof and liquid crystal display equipment, and aims to solve the technical problem that when an outer shell is deformed, friction is generated between the diffusion film and a brightness enhancement film to damage the brightness enhancement film, so that display white spots appear on a display screen.
In order to solve the technical problems, the invention adopts the following technical scheme:
a first aspect of the present invention provides a method of producing a diffusion film comprising: providing a transparent substrate, wherein the transparent substrate comprises a first surface and a second surface which are opposite; mixing shielding particles and first glue to form a first mixed solution, and coating the first mixed solution on the first surface to form a shielding layer; mixing first diffusion particles and second glue to form second mixed liquid, and coating the second mixed liquid on the shielding layer to form a first diffusion layer, wherein the hardness of the first diffusion layer is smaller than that of the shielding layer; and mixing the second diffusion particles, the electrostatic liquid and the third glue to form a third mixed liquid, and coating the third mixed liquid on the second surface to form a second diffusion layer.
The preparation method of the diffusion film provided by the first aspect of the invention comprises the steps of providing a transparent base layer, wherein the transparent base layer comprises a first surface and a second surface which are opposite; mixing shielding particles and first glue to form first mixed liquid, and coating the first mixed liquid on the first surface to form a shielding layer; mixing the first diffusion particles and the second glue to form a second mixed solution, and coating the second mixed solution on the shielding layer to form a first diffusion layer, wherein the hardness of the first diffusion layer is smaller than that of the shielding layer; mixing the second diffusion particles, the electrostatic liquid and the third glue to form a third mixed liquid, and coating the third mixed liquid on the second surface to form a second diffusion layer, so that the shielding layer is prevented from being in direct contact with the brightness enhancement film, friction damage of the diffusion film to the brightness enhancement film is reduced when the outer shell deforms and presses the inner backlight module, display white point problem of the display screen is reduced, and normal use of the liquid crystal display device is facilitated; and the coating process is simple and the operation is convenient.
As an improvement of the above-described method for producing a diffusion film of the present invention, the coating density of the first diffusion particles of the first diffusion layer is greater than the coating density of the second diffusion particles of the second diffusion layer.
As an improvement of the above-mentioned preparation method of a diffusion film of the present invention, coating the first mixed liquid on the first surface to form the shielding layer includes: coating the first mixed liquid on the first surface; and baking the first mixed liquid coated on the first surface for a preset time to enable the first mixed liquid to be solidified on the first surface to form the shielding layer.
As an improvement of the preparation method of the diffusion film, the shielding layer is a titanium white particle layer.
As an improvement of the preparation method of the diffusion film, the hardness of the titanium white particles in the titanium white particle layer is 1H or 2H.
As an improvement of the preparation method of the diffusion film, the first glue, the second glue and the third glue are different.
As an improvement of the preparation method of the diffusion film, the first diffusion particles are elastic particles, and the transparent base layer is a resin layer.
A second aspect of the present invention provides a diffusion membrane comprising: the transparent base layer is provided with a first surface and a second surface which are opposite to each other, the shielding layer is formed on the first surface, the first diffusion layer is formed on the shielding layer, the hardness of the first diffusion layer is smaller than that of the shielding layer, and the first diffusion layer faces to the light enhancement film of the backlight module; the second diffusion layer is formed on the second surface.
The diffusion film provided by the second aspect of the invention comprises a transparent base layer, a first diffusion layer, a shielding layer and a second diffusion layer, wherein the transparent base layer is provided with a first surface and a second surface which are opposite, the shielding layer is formed on the first surface, the first diffusion layer is formed on the shielding layer, the hardness of the first diffusion layer is smaller than that of the shielding layer, and the first diffusion layer faces to the brightness enhancement film of the backlight module; the second diffusion layer is formed on the second surface, so that the shielding layer is prevented from being in direct contact with the brightness enhancement film, when the outer shell deforms to squeeze the backlight module inside, friction damage of the diffusion film to the brightness enhancement film is reduced, display white point problems of the display screen are reduced, and normal use of the liquid crystal display device is facilitated.
As an improvement of the diffusion film according to the present invention, the shielding layer is a titanium white particle layer, and the titanium white particles in the titanium white particle layer have a hardness of 1H or 2H.
A third aspect of the present invention provides a liquid crystal display device, comprising: the display screen comprises an outer shell, a display screen and a backlight module; the backlight module comprises a reflecting film, a light guide plate, a diffusion film, a first light enhancement film, a second light enhancement film and a shading film which are stacked, wherein the diffusion film is adopted by the diffusion film; the first diffusion layer of the diffusion film faces the first light enhancement film, and the second diffusion layer of the diffusion film is close to the light guide plate; the outer shell comprises a cover plate and an annular frame arranged on the cover plate, the annular frame is fixedly connected with the display screen, and the display screen, the annular frame and the cover plate form an installation space; the backlight module is installed in the installation space, and the shading film is fixedly connected with the inner side of the display screen.
The liquid crystal display device provided by the third aspect of the present invention has the same advantages as the diffusion film described in the second aspect because it includes the diffusion film described in the second aspect.
In addition to the technical problems, features constituting the technical solutions, and advantageous effects caused by the technical features of the technical solutions described above, the diffusion film and the preparation method thereof, other technical problems that can be solved by the liquid crystal display device, other technical features included in the technical solutions, and advantageous effects caused by the technical features provided by the present invention will be described in further detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is apparent that the drawings in the following description are only a part of embodiments of the present invention, these drawings and the written description are not intended to limit the scope of the disclosed concept in any way, but rather to illustrate the disclosed concept to those skilled in the art by referring to the specific embodiments, and other drawings may be obtained from these drawings without inventive effort to those skilled in the art.
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a diffusion film and a first brightness enhancement film according to an embodiment of the present invention;
fig. 4a to 4d are flowcharts of preparation of a diffusion film according to an embodiment of the present invention.
Reference numerals illustrate:
1: a backlight module; 11: a reflective film;
12: a light guide plate; 13: a diffusion film;
131: a transparent base layer; 132: a first diffusion layer;
133: a shielding layer; 134: a second diffusion layer;
14: a first light enhancement film; 141: a planar layer;
142: a prism layer; 15: a second light enhancement film;
16: a light shielding film; 2: a display screen;
3: an outer housing; 31: a cover plate;
32: an annular frame; 4: a support frame;
41: a back plate.
Detailed Description
In the prior art, a backlight module generally includes a diffusion film and a brightness enhancement film which are stacked, and the diffusion film has a hardness generally greater than that of the brightness enhancement film. However, the inside backlight module is easy to squeeze when the outer shell is deformed, so that friction is generated between the diffusion film and the brightness enhancement film, the brightness enhancement film is damaged, the display white point problem occurs on the display screen, and the normal use of the liquid crystal display device is affected.
In view of this, the present invention provides a diffusion film, a method for manufacturing the same, and a liquid crystal display device, wherein a shielding layer is formed on a first surface of a transparent substrate of the diffusion film, and a first diffusion layer is formed on the shielding layer, so that the hardness of the first diffusion layer is smaller than that of the shielding layer, and the first diffusion layer faces a brightness enhancement film of a backlight module, thus avoiding direct contact between the shielding layer and the brightness enhancement film.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Fig. 1 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention.
Referring to fig. 1 and 2, a liquid crystal display device provided by an embodiment of the present invention includes an outer case 3, a display screen 2, and a backlight module 1; the backlight module 1 comprises a reflecting film 11, a light guide plate 12, a diffusion film 13, a first intensifying film 14, a second intensifying film 15 and a shading film 16 which are stacked; the outer shell 3 comprises a cover plate 31 and an annular frame 32 arranged on the cover plate 31, the annular frame 32 is fixedly connected with the display screen 2, and the display screen 2, the annular frame 32 and the cover plate 31 form an installation space; the backlight module 1 is installed in the installation space, and the shading film 16 is fixedly connected with the inner side of the display screen 2.
The apron 31 can be the rectangular plate, and correspondingly, and annular frame 32 is the rectangle ring shape, and optional, annular frame 32 and apron 31 are integrated into one piece, and not only structural strength is high to there is not the splice seam between annular frame 32 and the apron 31, and the aesthetic measure is high. The display screen 2 may also be rectangular, and one end of the display screen 2, which is away from the cover plate 31, and the annular frame 32 may be bonded together, so that the display screen 2, the annular frame 32 and the cover plate 31 form a rectangular installation space. The light shielding film 16 may be adhered to the inside of the display screen 2 by an adhesive tape, that is, the side of the display screen 2 facing the installation space.
Correspondingly, the reflecting film 11, the light guide plate 12, the diffusion film 13, the first intensifying film 14, the second intensifying film 15 and the light shielding film 16 are rectangular, and are convenient to install in a rectangular installation space. The light source is disposed at a side of the light guide plate 12, and the light guide plate 12 can transmit light emitted from the light source. One side of the light guide plate 12 faces the reflective film, and the reflective film 11 can reflect light escaping from one side of the light guide plate 12 back to the light guide plate 12, thereby improving the utilization rate of the light source. The other side of the light guide plate 12 faces the diffusion film 13, and the diffusion film 13 has a high haze, a low optical transmittance, and a high optical diffusivity, so that the propagation direction of the light emitted from the light guide plate 12 can be corrected. The first and second light enhancement films 14 and 15 concentrate light into a small angle, and improve front luminance. The light shielding film 16 can make the light passing therethrough uniform, and control the intensity of the light irradiation within a preset range. By the functions of the reflecting film 11, the light guide plate 12, the diffusion film 13, the first intensifying film 14, the second intensifying film 15 and the light shielding film 16, a clear image can be displayed on the display screen 2.
Referring to fig. 2, one end of the supporting frame 4 is of an opening structure, the other end of the supporting frame 4 is provided with a back plate 41, one side of the light shielding film 16, which is close to the second brightness enhancement film 15, can be adhered to one end of the supporting frame 4, and the supporting frame 4 and the light shielding film 16 form an accommodating space, in which the second brightness enhancement film 15, the first brightness enhancement film 14, the diffusion film 13, the light guide plate 12 and the reflection film 11 are accommodated, and the supporting frame 4 can protect the backlight module 1.
The specific structure of the diffusion film 13 according to the embodiment of the present invention is described in detail below with reference to fig. 3, where fig. 3 is a schematic structural diagram of the diffusion film and the first brightness enhancement film according to the embodiment of the present invention.
Referring to fig. 3, the diffusion film 13 provided in the embodiment of the present invention includes a transparent base layer 131, a first diffusion layer 132, a shielding layer 133, and a second diffusion layer 134, where the transparent base layer 131 has a first surface and a second surface opposite to each other, the shielding layer 133 is formed on the first surface, the first diffusion layer 132 is formed on the shielding layer 133, the hardness of the first diffusion layer 132 is smaller than that of the shielding layer 133, and the first diffusion layer 132 faces the first brightness enhancement film 14 of the backlight module 1; a second diffusion layer 134 is formed on the second surface.
The transparent base layer 131 may be a glass layer, or the transparent base layer 131 may be a resin layer or the like. Alternatively, the transparent base layer 131 may be rectangular, and the first surface and the second surface are also rectangular. The shielding layer 133 is a film layer plated on the first surface, and the shielding layer 133 has shielding property, and shielding particles can be plated on the first surface by magnetron sputtering, brush coating, or the like to form the shielding layer 133. Similarly, the first diffusion layer 132 is a film layer plated on the shielding layer 133, and the first diffusion layer may be formed by plating first diffusion particles on the shielding layer 133 by magnetron sputtering, brush coating, or the like. Similarly, the second diffusion layer 134 is a film layer coated on the second surface, and the second diffusion film 134 may be formed by coating second diffusion particles on the second surface by magnetron sputtering, brush coating, or the like.
Referring to fig. 3, the first light enhancement film 14 includes a planar layer 141 and a prism layer 142, the planar layer 141 being adjacent to the first diffusion layer 132, the prism layer 142 being adjacent to the second light enhancement film 15, and light rays entering the prism layer 142 through the planar layer 141 may be concentrated into a small angle.
The present embodiment provides the diffusion film 13 with high haze, low optical transmittance, and high optical diffusivity by providing the transparent base layer 131, the first diffusion layer 132, the shielding layer 133, and the second diffusion layer 134. And make the hardness of first diffusion layer 132 be less than the hardness of shielding layer 133, the plane layer 141 of first enhancement film 14 is faced to first diffusion layer 132, so avoids shielding layer 133 and plane layer 141 direct contact, when the inside backlight module 1 of shell body 3 deformation extrusion, is favorable to reducing the friction damage that diffusion film 13 caused to plane layer 141 to be favorable to reducing display screen 2 and appearing showing the white spot problem, be favorable to liquid crystal display device's normal use.
In some embodiments, the shielding layer 133 is a titanium white particle layer, and the titanium white particles have high shielding power, strong decolorizing power and large brightness value, which is beneficial to improving the shielding performance of the shielding layer 133.
In some specific implementations, the hardness of the titanium white particles in the titanium white particle layer is 1H or 2H, and the hardness of the titanium white particles in the titanium white particle layer is greater than the hardness of the first diffusion layer 132. However, the hardness of the planar layer 141 is small, for example, the hardness of the planar layer 141 may be 1B. Referring to fig. 2 and 3, the first diffusion layer 132 of the diffusion film 13 faces the planar layer 141 of the first brightness enhancement film 14, so that titanium white particles are prevented from directly contacting the planar layer 141, and when the outer housing 3 deforms and presses the backlight module inside, friction damage of the diffusion film 13 to the planar layer 141 is reduced, so that the problem of display white spots of the display screen 2 is reduced.
In some specific implementations, the second diffusion layer 134 of the diffusion film 13 is proximate to the light guide plate 12. When the light emitted from the light guide plate 12 passes through the diffusion film 13, the propagation direction can be controlled within a preset range, so that a clear image can be displayed on the display screen 2.
Fig. 4a to fig. 4d are flowcharts of preparation of a diffusion film according to an embodiment of the present invention, and the following describes in detail the preparation method of a diffusion film according to an embodiment of the present invention with reference to fig. 4a to fig. 4 d:
a transparent substrate 131 is provided, the transparent substrate 131 including opposing first and second surfaces.
Referring to fig. 4a, the transparent base layer 131 may have a rectangular shape having opposite first and second surfaces, and both the first and second surfaces may have a planar structure. Illustratively, the transparent base layer 131 is a resin layer, and the resin layer has high impact strength and is not easy to crack; and the weight is small, and the light and thin design of the liquid crystal display device is satisfied.
The following description will take the example of the top surface of the transparent base layer 131 as the first surface and the bottom surface of the transparent base layer 131 as the second surface in fig. 4a, but it should be understood by those skilled in the art that this is not a limitation of the manufacturing process.
The shielding particles and the first glue are mixed to form a first mixed solution, and the first mixed solution is coated on the first surface to form the shielding layer 133.
Illustratively, the masking particles are poured into the first glue and the masking particles are mixed with the first glue by stirring to form a first mixed solution. The first mixed solution may be applied on the first surface by a doctor blade, and after the first mixed solution is cured, referring to fig. 4b, a shielding layer 133 may be formed on the first surface. After the first mixed solution is coated on the first surface, the first mixed solution coated on the first surface is baked for a preset time to cure the first mixed solution on the first surface to form the shielding layer 133. Specifically, the transparent base layer 131 coated with the first mixed solution may be placed in a baking machine to be baked for a preset time at a preset temperature value, so that the curing of the first mixed solution may be accelerated, which is advantageous for improving the production efficiency.
The first diffusion particles and the second glue are mixed to form a second mixed solution, and the second mixed solution is coated on the shielding layer 133 to form the first diffusion layer 132, wherein the hardness of the first diffusion layer 132 is smaller than that of the shielding layer 133.
Illustratively, the first diffusion particles are put into the second glue and the first diffusion particles are mixed with the second glue uniformly by stirring to form a second mixed solution. After the second mixed solution is coated on the shielding layer 133, the second mixed solution coated on the shielding layer 133 is baked for a preset time to cure the second mixed solution on the shielding layer 133 to form the first diffusion layer 132. Specifically, the transparent base layer 131 coated with the second mixed solution may be placed in a baking machine to be baked for a preset time at a preset temperature value, so that the curing of the second mixed solution may be accelerated, which is advantageous for improving the production efficiency.
Illustratively, the first diffusion particles are elastic particles, so that when the first diffusion layer 132 and the planar layer 141 of the first brightness enhancement film 14 rub against each other, friction damage of the first diffusion particles to the planar layer 141 is reduced. The specific material of the elastic particles can be selected and set by a person skilled in the art according to different product performance requirements.
Mixing the second diffusion particles, the electrostatic liquid and the third glue to form a third mixed liquid, and coating the third mixed liquid on the second surface to form the second diffusion layer 134.
Schematically, the second diffusion particles and the electrostatic liquid are put into the third glue and are mixed uniformly with the third glue by stirring to form a third mixed liquid. After the third mixed liquid is coated on the second surface, the third mixed liquid coated on the second surface is baked for a preset time to cure the third mixed liquid on the second surface to form the second diffusion layer 134. Specifically, the transparent base layer 131 coated with the third mixed solution may be placed in a baking machine to be baked for a preset time at a preset temperature value, so that the curing of the third mixed solution may be accelerated, which is advantageous for improving the production efficiency.
Illustratively, the coating density of the first diffusion particles of the first diffusion layer 132 is greater than the coating density of the second diffusion particles of the second diffusion layer 134. The coating density herein refers to the number of particles per unit area, that is, the number of first diffusion particles per unit area of the first diffusion layer 132 is greater than the number of second diffusion particles per unit area of the second diffusion layer 134. As for specific values of the coating density of the first diffusion particles of the first diffusion layer 132 and the coating density of the second diffusion particles of the second diffusion layer 134, it is possible to selectively set them according to different optical performance requirements by those skilled in the art.
By making the coating density of the first diffusion particles of the first diffusion layer 132 greater than the coating density of the second diffusion particles of the second diffusion layer 134, the first diffusion layer 132 and the second diffusion layer 134 can meet different optical performance requirements; and the first diffusion layer 132 and the second diffusion layer 134 cooperate with the shielding layer 133 so that the diffusion film 13 has a high haze, a low optical transmittance, and a high optical diffusivity.
Illustratively, the first glue, the second glue, and the third glue are all different. By making the first glue, the second glue and the third glue different, the glue with different components can be selected according to the properties, the usage amount and the like of the shielding particles, the first diffusion particles, the second diffusion particles and the electrostatic liquid, so that the cured first mixed liquid can be tightly attached to the first surface, the cured second mixed liquid can be tightly attached to the shielding layer 133, the cured third mixed liquid can be tightly attached to the second surface, and the first diffusion layer 132, the shielding layer 133 and the second diffusion layer 134 are prevented from being separated to affect the imaging of the display screen 2. The specific components of the first glue, the second glue and the third glue can be selected and set by a person skilled in the art according to the performance requirements of different products.
It will be appreciated that the temperature values and times of baking the first mixed solution, the second mixed solution and the third mixed solution may be different, and specifically may be selected and set by those skilled in the art according to the properties of the first glue, the second glue and the third glue.
Finally, it should be noted that, in preparing the diffusion film 13, there may be various coating sequences, for example, as shown in fig. 4a to 4d, a first mixed solution may be coated on the first surface, then a second mixed solution may be coated on the shielding layer, and finally a third mixed solution may be coated on the second surface; for another example, the third mixed liquid may be applied to the second surface, the first mixed liquid may be applied to the first surface, and the second mixed liquid may be applied to the shielding layer.
According to the method, the shielding particles are mixed with the first glue, the first diffusion particles are mixed with the second glue, the second diffusion particles, the electrostatic liquid and the third glue are mixed, so that the shielding layer 133, the first diffusion layer 132 and the second diffusion layer 134 can meet different optical performance requirements by respectively adjusting the use amounts of the shielding particles, the first diffusion particles, the second diffusion particles and the electrostatic liquid, and the applicability is high; and the coating process is simple and the operation is convenient.
In the above description, descriptions of the terms "one embodiment," "some embodiments," "examples," "specific examples," 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, schematic representations of the above terms are not necessarily directed 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. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. The preparation method of the backlight film group is characterized in that the backlight module comprises a reflecting film, a light guide plate, a diffusion film, a first intensifying film, a second intensifying film and a shading film which are arranged in a laminated mode; wherein, the preparation steps of the diffusion film are as follows:
providing a transparent substrate, wherein the transparent substrate comprises a first surface and a second surface which are opposite;
mixing shielding particles and first glue to form a first mixed solution, and coating the first mixed solution on the first surface to form a shielding layer;
mixing first diffusion particles and second glue to form second mixed liquid, and coating the second mixed liquid on the shielding layer to form a first diffusion layer, wherein the hardness of the first diffusion layer is smaller than that of the shielding layer;
mixing second diffusion particles, electrostatic liquid and third glue to form third mixed liquid, and coating the third mixed liquid on the second surface to form a second diffusion layer;
the coating density of the first diffusion particles of the first diffusion layer is greater than the coating density of the second diffusion particles of the second diffusion layer; the first diffusion particles are elastic particles, and the transparent base layer is a resin layer;
the shielding layer is a titanium white particle layer; the hardness of the titanium white particles in the titanium white particle layer is 1H or 2H, and the hardness of the titanium white particles in the titanium white particle layer is larger than that of the first diffusion layer;
the first glue, the second glue and the third glue are all different;
the first diffusion layer faces the first light enhancement film of the backlight module, the first light enhancement film comprises a plane layer and a prism layer, the plane layer is close to the first diffusion layer, the prism layer is close to the second light enhancement film, the first light enhancement film and the second light enhancement film are used for concentrating light into a smaller angle, one side of the second light enhancement film faces the light shielding film, and the light shielding film is used for controlling the light irradiation intensity within a preset range;
the second diffusion layer is close to the light guide plate of the backlight module, one side of the light guide plate faces the reflecting film, the other side of the light guide plate faces the diffusion film, the reflecting film is used for reflecting light escaping from one side of the light guide plate back to the light guide plate, and the diffusion film is used for correcting the propagation direction of light rays emitted from the light guide plate.
2. The method of claim 1, wherein applying the first mixed liquid to the first surface forms the masking layer, comprising:
coating the first mixed liquid on the first surface;
and baking the first mixed liquid coated on the first surface for a preset time to enable the first mixed liquid to be solidified on the first surface to form the shielding layer.
3. The backlight module is characterized by comprising a reflecting film, a light guide plate, a diffusion film, a first light enhancement film, a second light enhancement film and a shading film which are stacked; wherein the diffusion film comprises: the transparent base layer is provided with a first surface and a second surface which are opposite to each other, the shielding layer is formed on the first surface, the first diffusion layer is formed on the shielding layer, the hardness of the first diffusion layer is smaller than that of the shielding layer, and the first diffusion layer faces to the light enhancement film of the backlight module; the second diffusion layer is formed on the second surface;
the coating density of the first diffusion particles of the first diffusion layer is greater than the coating density of the second diffusion particles of the second diffusion layer; the first diffusion particles are elastic particles, and the transparent base layer is a resin layer;
the shielding layer is a titanium white particle layer, the hardness of titanium white particles in the titanium white particle layer is 1H or 2H, and the hardness of titanium white particles in the titanium white particle layer is larger than that of the first diffusion layer;
the first glue required for forming the shielding layer, the second glue required for forming the first diffusion layer and the third glue required for forming the second diffusion layer are all different;
the first diffusion layer faces the first light enhancement film of the backlight module, the first light enhancement film comprises a plane layer and a prism layer, the plane layer is close to the first diffusion layer, the prism layer is close to the second light enhancement film, the first light enhancement film and the second light enhancement film are used for concentrating light into a smaller angle, one side of the second light enhancement film faces the light shielding film, and the light shielding film is used for controlling the light irradiation intensity within a preset range;
the second diffusion layer is close to the light guide plate of the backlight module, one side of the light guide plate faces the reflecting film, the other side of the light guide plate faces the diffusion film, the reflecting film is used for reflecting light escaping from one side of the light guide plate back to the light guide plate, and the diffusion film is used for correcting the propagation direction of light rays emitted from the light guide plate.
4. A liquid crystal display device, characterized by comprising: an outer casing, a display screen, and a backlight module according to claim 3; the outer shell comprises a cover plate and an annular frame arranged on the cover plate, the annular frame is fixedly connected with the display screen, and the display screen, the annular frame and the cover plate form an installation space;
the backlight module is installed in the installation space, and the shading film is fixedly connected with the inner side of the display screen.
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| CN114228166B (en) * | 2021-10-26 | 2024-02-02 | 深圳市优凯特粘胶制品有限公司 | Preparation process of shading diffusion composite membrane |
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