CN111158190A - Backlight module, preparation method thereof, liquid crystal display module and intelligent terminal - Google Patents
Backlight module, preparation method thereof, liquid crystal display module and intelligent terminal Download PDFInfo
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- CN111158190A CN111158190A CN202010058436.1A CN202010058436A CN111158190A CN 111158190 A CN111158190 A CN 111158190A CN 202010058436 A CN202010058436 A CN 202010058436A CN 111158190 A CN111158190 A CN 111158190A
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- 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
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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
- G02B5/0205—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
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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
- 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
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention relates to a backlight module and a preparation method thereof, a liquid crystal display module and an intelligent terminal, wherein the preparation method of the backlight module comprises the following steps: providing a light-emitting panel, wherein the light-emitting panel comprises a back plate and a light source arranged on the back plate; applying an optical resin paint to the back sheet to form an intermediate layer covering the light source; and arranging a plurality of prism columns with light collecting function on one side of the middle layer, which is far away from the back plate. The prism column is equivalent to a lower brightness enhancement sheet in the traditional backlight module, and the prism column is arranged on one side of the middle layer, which is far away from the back plate, so that the thickness increase of the backlight module caused by the additional arrangement of the lower brightness enhancement sheet in the traditional direct type backlight module can be reduced, the space occupied by the stacking of all elements in the backlight module can be further reduced, and the development of the lightness and thinness of the liquid crystal display module is facilitated.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a preparation method of the backlight module, a liquid crystal display module and an intelligent terminal.
Background
Along with the demand of high brightness in the liquid crystal display market, a brightness enhancement film is usually introduced into a traditional liquid crystal display module, the brightness enhancement film is arranged in a backlight module of the liquid crystal display module to increase the brightness of the backlight module, and the brightness enhancement film is matched with an upper diffusion sheet and a lower diffusion sheet to be used, so that light emitted by a light source is concentrated and uniformly projected onto the brightness enhancement film by using the lower diffusion sheet, and then the light emitted by the brightness enhancement film is atomized and uniformly guided out by using the upper diffusion sheet. However, the stacking of the components in the backlight module occupies a large space, which is not conducive to the development of the liquid crystal display module.
Disclosure of Invention
Therefore, it is necessary to provide a backlight module, a method for manufacturing the backlight module, a liquid crystal display module and an intelligent terminal, aiming at the problem that stacking of each element in the backlight module occupies a large space and is not beneficial to development of light and thin of the liquid crystal display module.
A method for preparing a backlight module comprises the following steps:
providing a light-emitting panel, wherein the light-emitting panel comprises a back plate and a light source arranged on the back plate;
applying an optical resin paint to the back sheet to form an intermediate layer covering the light source; and
and arranging a plurality of prism columns with light collecting effect on one side of the middle layer, which is far away from the back plate.
In one embodiment, the step of disposing a plurality of prism columns with a light collecting effect on the side of the intermediate layer away from the back plate specifically includes the following steps:
providing a processing panel, wherein the processing panel is provided with a processing surface, the processing surface is provided with a plurality of grooves with the number equal to that of the prism columns, the shapes of the grooves are matched with those of the prism columns, and the grooves are filled with optical resin;
tightly attaching the processing surface of the processing panel to one side of the middle layer, which is far away from the back plate, so that the optical resin filled in the groove is in contact with the middle layer;
and curing the optical resin in the intermediate layer and the groove to combine the intermediate layer with the optical resin in the groove, and separating the processing panel from the intermediate layer to obtain the prism column.
In one embodiment, the step of disposing a plurality of prism columns with a light collecting effect on a side of the intermediate layer away from the back plate specifically includes:
and deforming one side of the intermediate layer, which is far away from the back plate, to form a plurality of prism columns with a light collecting effect.
In one embodiment, the deforming the side of the intermediate layer away from the back plate to form a plurality of prism columns with a light collecting effect specifically includes the following steps:
providing a processing panel, wherein the processing panel is provided with a processing surface, the processing surface is provided with a plurality of grooves with the number equal to that of the prism columns, and the shapes of the grooves are matched with those of the prism columns;
tightly attaching the processing surface of the processing panel to one side of the middle layer, which is far away from the back plate, so that the part of the optical resin coating forming the middle layer is filled into the groove;
and curing the intermediate layer and separating the processing panel from the intermediate layer to obtain the prism column.
In one embodiment, in the step of processing a plurality of prism columns with light gathering function, the extending direction of each prism column is perpendicular to the arrangement direction of the intermediate layer and the back plate, and is perpendicular to the direction in which the plurality of prism columns are arranged at intervals.
In one embodiment, after the step of deforming the side of the intermediate layer facing away from the back plate to form a plurality of prism columns having a light collecting effect, the preparation method further comprises the following steps: and arranging a diffusion plate on one side of the prism column, which is far away from the back plate.
In one embodiment, after the step of deforming the side of the intermediate layer facing away from the back plate to form a plurality of prism columns having a light collecting effect, the preparation method comprises the following steps: and coating an optical transparent adhesive on the middle layer to form a diffusion layer covering the prism columns.
In one embodiment, after the step of deforming the side of the intermediate layer facing away from the back plate to form a plurality of prism columns having a light collecting effect, the preparation method comprises the following steps: and arranging a brightness enhancement layer covering the prism columns on one side of the middle layer, which is far away from the back plate.
In one embodiment, before the step of applying an optical resin paint to the back sheet to form an intermediate layer covering the light source, the preparation method further includes the steps of: and forming a light mixing layer covering the light source on the backboard, wherein the light mixing layer comprises a lens structure which corresponds to the light source and has a light condensation effect and diffusion particles arranged in the lens structure.
In one embodiment, the forming of the light mixing layer on the backplane to cover the light source specifically includes the following steps: applying an optical resin paint mixed with diffusion particles to the back sheet to form a mixed layer covering the light source; and stamping the lens structure on one side of the mixed layer, which is far away from the back plate, by using a film pressing jig to form the light mixing layer.
In one embodiment, the refractive index of the optical resin forming the lens structure is n1, the refractive index of the diffusion particles is n2, and the refractive index of the intermediate layer is n3, n2 > n1 > n 3.
A backlight module includes:
the light emitting panel comprises a back plate and a light source arranged on the back plate;
the intermediate layer is formed on the back plate and covers the light source, and the material of the intermediate layer is optical resin;
and the prism columns are arranged on one side of the middle layer departing from the back plate at intervals and are used for converging light beams emitted by the light source and penetrating through the middle layer.
In one embodiment, the prism columns and the intermediate layer are integrally formed.
In one embodiment, the extending direction of each prism column is perpendicular to the arrangement direction of the intermediate layer and the back plate, and the extending direction of each prism column is perpendicular to the direction in which the plurality of prism columns are arranged at intervals.
In one embodiment, the backlight module comprises a diffusion plate, and the diffusion plate is arranged on one side of the prism column, which faces away from the back plate; or the backlight module comprises a diffusion layer which is made of optical transparent adhesive, is connected with the middle layer and covers the prism columns.
In one embodiment, the backlight module comprises a brightness enhancement layer disposed on a side of the intermediate layer facing away from the rear plate and covering the prism columns, and the brightness enhancement layer is used for converging light beams emitted by the light source and passing through the intermediate layer and the prism columns.
In one embodiment, the backlight module includes a light mixing layer disposed between the back plate and the intermediate layer and covering the light source, and the light mixing layer includes a lens structure corresponding to the light source and having a light condensing effect and diffusing particles disposed in the lens structure.
In one embodiment, the material of the lens structure is optical resin, the refractive index of the optical resin forming the lens structure is n1, the refractive index of the diffusion particles is n2, and the refractive index of the intermediate layer is n3, wherein n2 > n1 > n 3.
A liquid crystal display module includes:
a display panel; and
the backlight module prepared by the preparation method or the backlight module is connected with the display panel, and the back plate is positioned on one side of the middle layer, which is far away from the display panel.
The utility model provides an intelligent terminal, includes center, back lid and above-mentioned liquid crystal display module assembly, the back lid with the liquid crystal display module assembly set up in the both sides that the center carried on the back mutually.
According to the backlight module, the preparation method of the backlight module, the liquid crystal display module and the intelligent terminal, the middle layer replaces a traditional lower diffusion sheet, light beams emitted by a light source can be concentrated and uniformly projected to the prism columns, so that the projected light beams are converged through the prism columns, and the brightening effect is achieved. The prism column is equivalent to a lower brightness enhancement sheet in the traditional backlight module, and the prism column is arranged on one side of the middle layer, which is deviated from the back plate, so that the thickness increase of the backlight module caused by the additional arrangement of the lower brightness enhancement sheet can be reduced, and further, the space occupied by the stacking of all elements in the backlight module can be reduced, and the development of the lightness and thinness of the liquid crystal display module is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an intelligent terminal according to an embodiment of the present invention;
FIG. 2 is a schematic view of the LCD panel of FIG. 1 according to the first embodiment;
FIG. 3 is a schematic view of a second embodiment of the LCD panel shown in FIG. 1;
FIG. 4 is a schematic structural diagram of a backlight panel according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a backlight panel according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a back plate provided with a light source according to an embodiment;
FIG. 7 is a schematic structural view of an intermediate layer formed on the back plate of FIG. 6;
FIG. 8 is a schematic view of the processing surface of the processing panel in close contact with the intermediate layer of FIG. 7;
FIG. 9 is a schematic view of the prism columns of FIG. 8 after the process panel is separated from the interlayer;
fig. 10 is a schematic structural view of forming a mixed layer on the back plate in fig. 6;
FIG. 11 is a schematic structural diagram of the hybrid layer of FIG. 10 with a lens structure imprinted on a side of the hybrid layer facing away from the backplane;
FIG. 12 is a schematic structural diagram of an intermediate layer formed on the backplane of FIG. 11 to cover the light mixing layer;
FIG. 13 is a schematic view of the intermediate layer of FIG. 12 in close contact with the working surface of the working panel;
fig. 14 is a schematic view of the prism columns obtained after the process panel of fig. 13 is separated from the intermediate layer.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, the present application will describe a smart terminal 10 by taking a smart phone as an example. Those skilled in the art will readily understand that the smart terminal 10 of the present application may be any device having communication and storage functions, such as an electronic device, such as a smart phone, a tablet computer, a notebook computer, a mobile phone, a video phone, a digital still camera, an electronic book reader, a Portable Multimedia Player (PMP), a mobile medical device, etc., and the representation of the smart terminal 10 is not limited herein. Of course, wearable devices such as smartwatches are also applicable to the smart terminal 10 according to the embodiments of the present application.
Referring to fig. 2, the liquid crystal display module 13 includes a backlight module 100 and a display panel 200. The backlight module 100 is connected to the display panel 200, and the backlight module 100 is configured to emit a light beam to the display panel 200, so that the display panel 200 can display information. The Display panel 200 may employ an LCD (Liquid Crystal Display) screen for displaying information, and the LCD screen may be a TFT (Thin Film Transistor) screen, an IPS (In-Plane Switching) screen, or an SLCD (split Liquid Crystal Display) screen. The display panel 200 may also adopt an OLED (Organic Light-Emitting Diode) screen for displaying information, and the OLED screen may be an AMOLED (Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED (Super Active Matrix Organic Light-Emitting Diode) screen or a Super AMOLED Plus (Super Active Matrix Organic Light-Emitting Diode Plus) screen.
The backlight assembly 100 includes a light emitting panel 110, an intermediate layer 120, and prism columns 130. The light emitting panel 110 includes a rear plate 111 and a light source 112 disposed on the rear plate 111. The back plate 111 mainly supports and protects the light source 112, and the back plate 111 can also reflect the light beam emitted by the light source 112 to improve the optical utilization rate. The back plate 111 may be made of a material with high strength, such as an aluminum plate or a titanium alloy plate, so that the thickness of the back plate 111 may be properly reduced on the premise that the back plate 111 has high strength enough, thereby reducing the overall thickness of the backlight module 100. In addition, the light sources 112 may be point light sources, and the light sources 112 may also be linear light sources, which are uniformly distributed on the back plate 111 to ensure uniformity of emitted light beams.
The intermediate layer 120 is formed on the back plate 111 and covers the light source 112, and the back plate 111 is located on a side of the intermediate layer 120 facing away from the display panel 200. The intermediate layer 120 may be made of a transparent optical resin material, for example, an optical resin paint may be uniformly applied to the back plate 111 and cover the light source 112, so as to form the intermediate layer 120. The intermediate layer 120 can concentrate the light beam emitted by the light source 112 to be atomized and uniformly projected, and the utilization rate of the light beam emitted by the light source 112 can be improved because the intermediate layer 120 covers the light source 112.
The number of the prism columns 130 is multiple, the prism columns 130 are arranged at intervals on one side of the intermediate layer 120 away from the back plate 111, and the prism columns 130 are used for converging light beams emitted by the light source 112 and passing through the intermediate layer 120, so that a brightness enhancement effect is achieved. The terms "plurality" or "a plurality" as used in the various embodiments of the present application mean two or more. In one embodiment, the prism columns 130 and the intermediate layer 120 are integrally formed, for example, the prism columns 130 can be formed by deforming the intermediate layer 120 on the side away from the back plate 111. Of course, the prism columns 130 can also be separated from the intermediate layer 120, for example, the formed prism columns 130 can be directly disposed on the intermediate layer 120.
In one embodiment, the extending direction of each prism column 130 (i.e., the Z-axis direction shown in fig. 2) is perpendicular to the arrangement direction of the intermediate layer 120 and the rear plate 111 (i.e., the Y-axis direction shown in fig. 2), and the extending direction of each prism column 130 (i.e., the Z-axis direction shown in fig. 2) is perpendicular to the direction in which the plurality of prism columns 130 are arranged at intervals (i.e., the X-axis direction shown in fig. 2). In addition, taking fig. 2 as an example, the cross-sectional shape of the prism columns 130 may be a triangle, and the cross-sections of a plurality of prism columns 130 are combined together to form a saw-tooth structure, so as to enhance the light-gathering performance of the prism columns 130. Of course, the prism columns 130 may have other shapes that can focus light.
In an embodiment, the backlight module 100 further includes a light mixing layer 140 disposed between the back plate 111 and the intermediate layer 120 and covering the light source 112, wherein the light mixing layer 140 includes a lens structure 141 corresponding to the light source 112 and having a light condensing effect, and diffusion particles 142 disposed in the lens structure 141. The diffusion particles 142 may be nanoparticles, such as inorganic nanoparticles. Thus, the light beam emitted by the light source 112 can be condensed by the lens structure 141 and then atomized by the intermediate layer 120 to reach the prism column 130, so as to achieve the purpose of condensing and brightening.
In an embodiment, the backlight module 100 further includes a diffusion plate 150 disposed on a side of the prism columns 130 away from the rear plate 111, and the diffusion plate 150 is used for atomizing and uniformly guiding the light beams emitted from the prism columns 130 to the display panel 200. When the refractive index of the optical resin forming the lens structure 141 is set to n1, the refractive index of the diffusion particles 142 is set to n2, and the refractive index of the intermediate layer 120 is set to n3, n2 > n1 > n3, and thus a better brightness enhancement diffusion effect can be achieved. In addition, the refractive index of air is set to be n4, the refractive index of the diffusion plate 150 is set to be n5, and in order to further improve the diffusion effect, n1/n3 is n4/n5,
in other embodiments, referring to fig. 3, the diffusion plate 150 can be replaced by a diffusion layer 160, the diffusion layer 160 is connected to the middle layer 120 and covers the prism columns 130, the diffusion layer 160 can be formed by coating an optically transparent adhesive on the middle layer 120, and the diffusion layer 160 can fill the gap between two adjacent prism columns 130. If the refractive index of the diffusion layer 160 is n6, n1/n3 is n4/n 6. In addition to the diffuser plate 150 (or the diffuser layer 160), brightness enhancement layers (corresponding to the upper brightness enhancement sheets in the conventional direct-type backlight module) covering the prism columns 130 may be disposed between the diffuser plate 150 (or the diffuser layer 160) and the prism columns 130 to focus the light beams emitted from the light sources 112 and passing through the intermediate layer 120 and the prism columns 130.
In the liquid crystal display module 13 of the present application, the intermediate layer 120 replaces the lower diffusion sheet of the conventional direct-type backlight module, and can concentrate the light beams emitted from the light sources 112 to be uniformly projected onto the prism columns 130, so that the projected light beams are converged by the prism columns 130, thereby achieving the brightness enhancement effect. The prism columns 130 are equivalent to the lower brightness enhancement plate in the conventional direct-type backlight module 100, and the prism columns 130 are disposed on the side of the middle layer 120 away from the back plate 111, so that the thickness increase of the backlight module 100 caused by the additional arrangement of the brightness enhancement plates can be reduced, the space occupied by the stacking of the components in the backlight module 100 can be reduced, and the development of the lightness and thinness of the liquid crystal display module 13 is facilitated. It should be noted that the diffuser plate 150 or the diffuser layer 160 is equivalent to an upper diffuser plate in a conventional direct-type backlight module, and the brightness enhancement layer is equivalent to an upper brightness enhancement plate in a conventional direct-type backlight module, so that the backlight module still has a multifunctional structure layer on the premise of reducing the thickness.
Referring to fig. 4, an embodiment of the present application further provides a method for manufacturing the backlight module 100.
The preparation method of the backlight module 100 comprises the following steps:
step S810, as shown in fig. 6, provides the light emitting panel 110. The light emitting panel 110 includes a rear plate 111 and a light source 112 provided to the rear plate 111. The back plate 111 mainly supports and protects the light source 112, and the back plate 111 can also reflect the light beam emitted by the light source 112 to improve the optical utilization rate. The back plate 111 may be made of a material with high strength, such as an aluminum plate or a titanium alloy plate, so that the thickness of the back plate 111 can be reduced appropriately on the premise that the back plate 111 has sufficiently high strength. The light sources 112 may be point light sources or linear light sources, which are uniformly distributed on the back plate 111 to ensure uniformity of the emitted light beams.
Step S830, referring to fig. 7, applies an optical resin paint to the back sheet 111 to form the intermediate layer 120 covering the light sources 112. The intermediate layer 120 can concentrate and uniformly project the light beam emitted by the light source 112, and the utilization rate of the light beam emitted by the light source 112 can be improved because the intermediate layer 120 covers the light source 112.
In step S840, referring to fig. 9, a plurality of prism columns 130 with light collecting function are disposed on a side of the intermediate layer 120 away from the back plate 111. In one embodiment, the extending direction of each prism column 130 is perpendicular to the arrangement direction of the intermediate layer 120 and the rear plate 111, and perpendicular to the direction in which the plurality of prism columns 130 are arranged at intervals. For example, the side of the intermediate layer 120 facing away from the back plate 111 may be deformed to form a plurality of prism columns 130 having a light collecting effect, and as shown in fig. 5, the process of forming the prism columns 130 may specifically include the following steps:
in step S841, referring to fig. 8, a processing panel 300 is provided, the processing panel 300 has a processing surface 310, the processing surface 310 is provided with a plurality of grooves 311 equal to the prism columns 130 in number, and the shape of the grooves 311 is adapted to the shape of the prism columns 130. The processed panel 300 may be made of a steel material having a high heat resistance.
Step 842, the processing surface 310 of the processing panel 300 is tightly attached to the side of the intermediate layer 120 away from the back plate 111, and the uncured intermediate layer 120 has fluidity and compressibility, so that the optical resin coating can be partially filled into the groove 311 in the process of pressing the processing surface 310 and the intermediate layer 120.
In step S843, the intermediate layer 120 is cured to maintain the shape of the intermediate layer 120 deformed by the processing panel 300, and the processing panel 300 is separated from the intermediate layer 120, so that the prism columns 130 shown in fig. 8 can be obtained.
For another example, the prism columns 130 may be obtained by non-deforming the intermediate layer 120, in this case, the optical resin may be filled in the grooves 311, then the processing surface 310 of the processing panel 300 is tightly attached to the side of the intermediate layer 120 away from the back plate 111, so that the optical resin filled in the grooves 311 contacts the intermediate layer 120, and then the optical resin in the intermediate layer 120 and the grooves 311 is cured, so that the intermediate layer 120 is bonded to the optical resin in the grooves 311, and the processing panel 300 is separated from the intermediate layer 120, so as to obtain the prism columns 130. The optical resin in the recess 311 and the optical resin constituting the intermediate layer 120 may be the same or different in material.
In an embodiment, referring to fig. 10 and 11, before the step of applying the optical resin paint to the back sheet 111 to form the intermediate layer 120 covering the light sources 112, i.e., between step S810 and step S830, the preparation method further includes the steps of:
in step S830, a light mixing layer 140 covering the light source 112 is formed on the back plate 111, and the light mixing layer 140 includes a lens structure 141 corresponding to the light source 112 and having a light condensing effect, and diffusion particles 142 disposed in the lens structure 141. The diffusion particles 142 may be nanoparticles, such as inorganic nanoparticles. For example, an optical resin paint mixed with the diffusion particles 142 may be applied to the rear plate 111 to form a mixed layer 140a covering the light source 112; then, the film pressing jig is used to stamp the lens structure 141 on the side of the mixed layer 140a away from the back plate 111, so as to form the mixed layer 140. Thus, the light beam emitted by the light source 112 can be condensed by the lens structure 141 and then atomized by the intermediate layer 120 to reach the prism column 130, so as to achieve the purpose of condensing and brightening.
It should be noted that, on the basis of disposing the light mixing layer 140, the subsequent process of forming the prism columns 130 can refer to fig. 12 to 14, and the forming process is the same as the above-mentioned forming process, and is not repeated here.
In an embodiment, referring to fig. 2, after the step of deforming the side of the intermediate layer 120 away from the rear plate 111 to form a plurality of prism columns 130 having a light collecting effect, a diffuser plate 150 may be further disposed on the side of the prism columns 130 away from the rear plate 111. When the refractive index of the optical resin forming the lens structure 141 is n1, the refractive index of the diffusion particles 142 is n2, the refractive index of the intermediate layer 120 is n3, the refractive index of air is n4, and the refractive index of the diffusion plate 150 is n5, the refractive indices should satisfy the following correspondence: n2 > n1 > n3 and n1/n3 ═ n4/n5, so that a better brightening diffusion effect can be achieved. Still alternatively, as shown in FIG. 3, an optically clear adhesive is applied to the intermediate layer 120 to form a diffusion layer 160 covering the prism columns 130. When the refractive index of the diffusion layer 160 is set to n6, the respective refractive indices satisfy the following correspondence: n2 > n1 > n3 and n1/n3 ═ n4/n6, so that a better brightening diffusion effect can be achieved. After the step of deforming the side of the middle layer 120 away from the back plate 111 to form a plurality of prism columns 130 with light collecting effect, a brightness enhancement layer covering the prism columns 130 may be further disposed on the side of the middle layer 120 away from the back plate 111, and is formed between the diffusion plate 150 (or the diffusion layer 160) and the middle layer 120 to converge the light beams emitted by the light sources 112 and passing through the middle layer 120 and the prism columns 130, so as to further increase the illumination brightness of the prepared backlight module 100.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the 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 (20)
1. A method for preparing a backlight module is characterized by comprising the following steps:
providing a light-emitting panel, wherein the light-emitting panel comprises a back plate and a light source arranged on the back plate;
applying an optical resin paint to the back sheet to form an intermediate layer covering the light source; and
and arranging a plurality of prism columns with light collecting effect on one side of the middle layer, which is far away from the back plate.
2. The preparation method according to claim 1, wherein the step of providing a plurality of prism columns with light collecting effect on the side of the intermediate layer away from the back plate comprises the following steps:
providing a processing panel, wherein the processing panel is provided with a processing surface, the processing surface is provided with a plurality of grooves with the number equal to that of the prism columns, the shapes of the grooves are matched with those of the prism columns, and the grooves are filled with optical resin;
tightly attaching the processing surface of the processing panel to one side of the middle layer, which is far away from the back plate, so that the optical resin filled in the groove is in contact with the middle layer;
and curing the optical resin in the intermediate layer and the groove to combine the intermediate layer with the optical resin in the groove, and separating the processing panel from the intermediate layer to obtain the prism column.
3. The method according to claim 1, wherein the step of providing a plurality of prism columns with light collecting effect on the side of the intermediate layer away from the back plate comprises:
and deforming one side of the intermediate layer, which is far away from the back plate, to form a plurality of prism columns with a light collecting effect.
4. The method according to claim 3, wherein the step of deforming the side of the intermediate layer facing away from the back plate to form a plurality of prism columns with a light collecting effect comprises the following steps:
providing a processing panel, wherein the processing panel is provided with a processing surface, the processing surface is provided with a plurality of grooves with the number equal to that of the prism columns, and the shapes of the grooves are matched with those of the prism columns;
tightly attaching the processing surface of the processing panel to one side of the middle layer, which is far away from the back plate, so that the part of the optical resin coating forming the middle layer is filled into the groove;
and curing the intermediate layer and separating the processing panel from the intermediate layer to obtain the prism column.
5. The method according to claim 1, wherein in the step of processing the plurality of prism columns for collecting light, the extending direction of each of the prism columns is perpendicular to the arrangement direction of the intermediate layer and the back plate, and perpendicular to the direction in which the plurality of prism columns are arranged at intervals.
6. The method of claim 1, wherein after the step of deforming the side of the intermediate layer facing away from the backplane to form a plurality of prism pillars having a light collecting effect, the method further comprises the steps of: and arranging a diffusion plate on one side of the prism column, which is far away from the back plate.
7. The method of claim 1, wherein after the step of deforming the side of the intermediate layer facing away from the backplane to form a plurality of prism pillars having a light collecting effect, the method comprises the steps of: and coating an optical transparent adhesive on the middle layer to form a diffusion layer covering the prism columns.
8. The method of claim 1, wherein after the step of deforming the side of the intermediate layer facing away from the backplane to form a plurality of prism pillars having a light collecting effect, the method comprises the steps of: and arranging a brightness enhancement layer covering the prism columns on one side of the middle layer, which is far away from the back plate.
9. The production method according to claim 1, characterized by further comprising, before the step of applying an optical resin paint to the back sheet to form an intermediate layer covering the light source, the steps of: and forming a light mixing layer covering the light source on the backboard, wherein the light mixing layer comprises a lens structure which corresponds to the light source and has a light condensation effect and diffusion particles arranged in the lens structure.
10. The method for preparing a light guide plate according to claim 9, wherein the step of forming a light mixing layer on the back plate to cover the light source comprises the following steps: applying an optical resin paint mixed with diffusion particles to the back sheet to form a mixed layer covering the light source; and stamping the lens structure on one side of the mixed layer, which is far away from the back plate, by using a film pressing jig to form the light mixing layer.
11. The production method according to claim 10, wherein the refractive index of the optical resin forming the lens structure is n1, the refractive index of the diffusing particles is n2, and the refractive index of the intermediate layer is n3, and n2 > n1 > n 3.
12. A backlight module, comprising:
the light emitting panel comprises a back plate and a light source arranged on the back plate;
the intermediate layer is formed on the back plate and covers the light source, and the material of the intermediate layer is optical resin;
and the prism columns are arranged on one side of the middle layer departing from the back plate at intervals and are used for converging light beams emitted by the light source and penetrating through the middle layer.
13. A backlight module according to claim 12, wherein the prism columns and the intermediate layer are integrally formed.
14. The backlight module according to claim 12, wherein the prism columns extend in a direction perpendicular to the arrangement direction of the middle layer and the back plate, and the prism columns extend in a direction perpendicular to the arrangement direction of the prism columns.
15. The backlight module according to claim 12, wherein the backlight module comprises a diffuser plate disposed on a side of the prism columns facing away from the back plate; or the backlight module comprises a diffusion layer which is made of optical transparent adhesive, is connected with the middle layer and covers the prism columns.
16. The backlight module according to claim 12, wherein the backlight module comprises a brightness enhancement layer disposed on a side of the intermediate layer facing away from the back plate and covering the prism columns, the brightness enhancement layer being configured to converge the light beams emitted by the light sources that pass through the intermediate layer and the prism columns.
17. The backlight module according to claim 12, wherein the backlight module comprises a light mixing layer disposed between the back plate and the intermediate layer and covering the light source, and the light mixing layer comprises a lens structure corresponding to the light source and having a light condensing effect and diffusing particles disposed in the lens structure.
18. A backlight module according to claim 17, wherein the lens structure is made of optical resin, the refractive index of the optical resin forming the lens structure is n1, the refractive index of the diffusing particles is n2, and the refractive index of the intermediate layer is n3, n2 > n1 > n 3.
19. The utility model provides a liquid crystal display module assembly which characterized in that includes:
a display panel; and
the backlight module prepared by the preparation method according to any one of claims 1 to 11 or the backlight module according to any one of claims 12 to 18 is connected with the display panel, and the back plate is positioned on the side of the middle layer, which is away from the display panel.
20. An intelligent terminal, comprising a middle frame, a rear cover and the liquid crystal display module set according to claim 19, wherein the rear cover and the liquid crystal display module set are disposed on opposite sides of the middle frame.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010058436.1A CN111158190A (en) | 2020-01-19 | 2020-01-19 | Backlight module, preparation method thereof, liquid crystal display module and intelligent terminal |
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| CN202010058436.1A CN111158190A (en) | 2020-01-19 | 2020-01-19 | Backlight module, preparation method thereof, liquid crystal display module and intelligent terminal |
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