CN117055266B

CN117055266B - Backlight module, preparation method thereof and liquid crystal display device

Info

Publication number: CN117055266B
Application number: CN202311316134.XA
Authority: CN
Inventors: 万业; 叶利丹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2023-10-12
Filing date: 2023-10-12
Publication date: 2024-02-09
Anticipated expiration: 2043-10-12
Also published as: CN117055266A

Abstract

The application provides a backlight module, a preparation method thereof and a liquid crystal display device, wherein the backlight module comprises a light emitting part and a light guide assembly, wherein the light emitting part is used for emitting visible light, the light guide assembly comprises a first light emitting surface, a second light emitting surface and a light entering surface, the first light emitting surface and the second light emitting surface are arranged in a back-to-back mode, the light entering surface is connected between the first light emitting surface and the second light emitting surface, and the light emitting part and the light entering surface are arranged oppositely; the light guide assembly further comprises a half-transparent half-reflective diffusion layer with half-transparent half-reflective diffusion media, and the half-transparent half-reflective diffusion media are used for transmitting, reflecting and diffusing visible light emitted by the light emitting piece so that the visible light can be emitted from the first light emitting surface and the second light emitting surface. The semi-transparent and semi-reflective diffusion layer can be used for evenly emitting visible light emitted by the light emitting piece from the first light emitting surface and the second light emitting surface which are arranged in a back-to-back mode, an additional light emitting structure and a light guiding structure are not required to be arranged, the thickness of the backlight module can be effectively reduced, and the light and thin performance and the compactness of the backlight module are improved.

Description

Backlight module, preparation method thereof and liquid crystal display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module, a preparation method thereof and a liquid crystal display device.

Background

In the related art, since the lcd device needs a backlight module, the split thickness of the backlight module for emitting light from both sides is too large.

Disclosure of Invention

The application aims to provide a backlight module, a preparation method thereof and a liquid crystal display device, so as to solve the technical problem that the splicing thickness of the double-sided backlight module is too large.

In a first aspect, the present application provides a backlight module, including:

the luminous piece is used for emitting visible light;

the light guide assembly comprises a first light-emitting surface, a second light-emitting surface and a light-entering surface, wherein the first light-emitting surface and the second light-emitting surface are arranged in a back-to-back mode, the light-entering surface is connected between the first light-emitting surface and the second light-emitting surface, and the light-emitting piece is arranged opposite to the light-entering surface; the light guide assembly further comprises at least one half-transparent half-reflective diffusion layer, a half-transparent half-reflective diffusion medium is arranged in the half-transparent half-reflective diffusion layer and used for transmitting, reflecting and diffusing visible light emitted by the light emitting piece so that the visible light can be emitted from the first light emitting surface and the second light emitting surface.

In the backlight module provided by the application, the light guide assembly comprises a light incident surface, a first light emergent surface and a second light emergent surface, and the light emitting piece and the light incident surface are oppositely arranged. The light guide assembly further comprises a half-transparent half-reflective diffusion layer with half-transparent half-reflective diffusion media, and the half-transparent half-reflective diffusion media are used for transmitting, reflecting and diffusing visible light emitted by the light emitting piece so that the visible light can be emitted from the first light emitting surface and the second light emitting surface. The semi-transparent and semi-reflective diffusion layer can be used for evenly emitting visible light emitted by the light emitting piece from the first light emitting surface and the second light emitting surface which are arranged in a back-to-back mode, an additional light emitting structure and a light guiding structure are not required to be arranged, the thickness of the backlight module can be effectively reduced, the light and thin performance and the compactness of the backlight module are improved, and further, the cost of the backlight module can be effectively reduced.

The backlight module further comprises a first display panel and a second display panel, wherein the first display panel is arranged on the first light-emitting surface, and the second display panel is arranged on the second light-emitting surface; the light guide component comprises at least one TFT substrate and at least one semi-transparent semi-reflective diffusion layer;

the semi-transparent semi-reflective diffusion layer is positioned between the TFT substrate and the first display panel; and/or

The semi-transparent semi-reflective diffusion layer is positioned between the TFT substrate and the second display panel; and/or

The number of the TFT substrates is two, and the semi-transparent semi-reflective diffusion layer is positioned between the two TFT substrates.

The side surface of the light guide assembly comprises the light incident surface, a first side surface, a second side surface and a third side surface which are sequentially connected;

the backlight module further comprises a reflecting piece, wherein the reflecting piece is arranged on at least one of the first side face, the second side face and the third side face.

The backlight module further comprises a first driving assembly, a second driving assembly and a controller, wherein the first driving assembly is respectively and electrically connected with the first display panel and the controller, and the second driving assembly is respectively and electrically connected with the second display panel and the controller; the luminous element is electrically connected with the controller.

The first driving component and the second driving component are arranged on the same side of the light guide component; or alternatively, the first and second heat exchangers may be,

the first driving component and the second driving component are arranged on two opposite sides of the light guide component; or alternatively, the first and second heat exchangers may be,

the first driving component and the second driving component are arranged on two adjacent sides of the light guide component.

The controller comprises a first controller and a second controller;

the first controller is arranged on one side of the first display panel, which is away from the light guide assembly, and the second controller is arranged on one side of the second display panel, which is away from the light guide assembly; or, the first controller and the second controller are both arranged on one side of the second display panel, which is away from the light guide assembly, and the first controller and the second controller are respectively arranged on two opposite sides of the light guide assembly.

Wherein the first display panel includes:

the first array component is arranged on one side of the light guide component and comprises a first internal polarizing layer, a first flat layer, a first array layer and a first insulating layer which are sequentially stacked along the direction deviating from the light guide component;

the first color film assembly is arranged on one side, deviating from the light guide assembly, of the first array assembly, and comprises a first liquid crystal box layer, a first color film layer and a first substrate which are sequentially stacked along the direction deviating from the light guide assembly;

the first external polarizing layer is arranged on one side of the first substrate, which is away from the light guide component;

the second display panel includes:

the second array component is arranged on one side of the light guide component and comprises a second internal polarizing layer, a second flat layer, a second array layer and a second insulating layer which are sequentially stacked along the direction deviating from the light guide component;

the second color film assembly is arranged on one side, deviating from the light guide assembly, of the second array assembly, and comprises a second liquid crystal box layer, a second color film layer and a second substrate which are sequentially stacked along the direction deviating from the light guide assembly;

the second external polarizing layer is arranged on one side of the second substrate, which is away from the light guide component.

In a second aspect, the present application provides a method for preparing a backlight module, which is used for preparing the backlight module, and the method for preparing the backlight module includes:

forming a light guide assembly and providing a light emitting element on the light incident surface side of the light guide assembly;

forming a first display panel on a first light-emitting surface of the light guide assembly;

and forming a second display panel on the second light emitting surface of the light guide assembly.

Wherein the "forming a first display panel on one side of the light guide assembly" includes:

forming a first array assembly on one side of the light guide assembly;

forming a first color film component;

vacuum forming the first array component and the first color film component into a box;

attaching a first external polarizing layer on one side of the first color film substrate, which is away from the first array component, so as to form a first display panel;

the "forming a second display panel on the other side of the light guide assembly" includes:

forming a second array assembly on the other side of the light guide assembly;

forming a second color film component;

vacuum forming the second array component and the second color film component into a box;

and attaching a second external polarizing layer on one side of the second color film substrate, which is away from the second array assembly, so as to form a second display panel.

In a third aspect, the present application provides a liquid crystal display device, which is characterized by comprising the backlight module.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic cross-sectional structure diagram of a light guide assembly, a first display panel and a second display panel according to an embodiment of the present disclosure;

fig. 2 is a schematic cross-sectional structure diagram of a light guide assembly, a first display panel and a second display panel according to an embodiment of the present disclosure;

fig. 3 is a schematic cross-sectional view of a light guide assembly, a first display panel and a second display panel according to an embodiment of the present disclosure;

fig. 4 is a schematic cross-sectional view of a light guide assembly, a first display panel and a second display panel according to an embodiment of the present disclosure;

FIG. 5 is a schematic top view of a light guide assembly and a reflector according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a cross-sectional structure of a light guide assembly and a reflector according to an embodiment of the present disclosure;

fig. 7 is a schematic cross-sectional structure of a backlight module according to an embodiment of the present disclosure;

fig. 8 is a schematic top view of a backlight module according to an embodiment of the present disclosure;

fig. 9 is a schematic top view diagram of a backlight module according to an embodiment of the present disclosure;

fig. 10 is a schematic top view of a backlight module according to an embodiment of the present disclosure;

fig. 11 is a schematic top view of a backlight module according to an embodiment of the present disclosure;

fig. 12 is a schematic cross-sectional view of a backlight module according to an embodiment of the present disclosure;

fig. 13 is a schematic cross-sectional view of a backlight module according to an embodiment of the present disclosure;

fig. 14 is a schematic cross-sectional view of a backlight module according to an embodiment of the present disclosure;

fig. 15 is a schematic cross-sectional structure of a first display panel according to an embodiment of the present application;

fig. 16 is a schematic cross-sectional structure of a second display panel according to an embodiment of the present disclosure;

fig. 17 is a flowchart of a preparation of a backlight module according to an embodiment of the present disclosure;

fig. 18 is a preparation flowchart in a preparation flowchart S300 of a backlight module provided in the embodiment of the present application;

fig. 19 is a preparation flowchart in a preparation flowchart S500 of a backlight module provided in an embodiment of the present application.

Description of the reference numerals:

the backlight module comprises a backlight module 100, a light guide component 1, a first light emitting surface 101, a second light emitting surface 102, a light incident surface 103, a first side 104, a second side 105, a third side 106, a TFT substrate 11, a transflective layer 12, a transflective medium 121, a light emitting element 2, a first display panel 3, a first array component 31, a first internal polarizing layer 311, a first flat layer 312, a first array layer 313, a first insulating layer 314, a first color film component 32, a first liquid crystal box layer 321, a first color film layer 322, a first substrate 323, a first external polarizing layer 33, a second display panel 4, a second array component 41, a second color film component 42, a second external polarizing layer 43, a first driving component 5, a second driving component 6, a controller 7, a first controller 71, a second controller 72, a reflector 80 and a housing 90.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without undue burden, are within the scope of the present application.

Reference herein to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment or implementation may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the present specification, for convenience, words such as "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate an azimuth or a positional relationship, are used to describe positional relationships of constituent elements with reference to the drawings, only for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or elements referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus are not to be construed as limiting the present disclosure. The positional relationship of the constituent elements is appropriately changed according to the direction of the described constituent elements. Therefore, the present invention is not limited to the words described in the specification, and may be appropriately replaced according to circumstances.

In this specification, the terms "mounted," "connected," and "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, it may be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intermediate members, or may be in communication with the interior of two elements. The meaning of the above terms in the present disclosure can be understood by one of ordinary skill in the art as appropriate.

Referring to fig. 1, the present application provides a backlight module 100, where the backlight module 100 includes a light guiding assembly 1 and a light emitting member 2.

The backlight module 100 is used as a side-incident display device for illustration, and should not be construed as limiting the present application.

The light guide assembly 1 includes a first light emitting surface 101, a second light emitting surface 102, and a light incident surface 103 connected between the first light emitting surface 101 and the second light emitting surface 102. The light emitting element 2 is disposed opposite to the light incident surface 103.

The light guide assembly 1 further includes at least one half-reflection diffusion layer 12, the half-reflection diffusion layer 12 has a half-reflection diffusion medium 121 therein, and the half-reflection diffusion medium 121 is configured to transmit, reflect and diffuse the visible light emitted by the light emitting element 2, so that the visible light is emitted from the first light emitting surface 101 and the second light emitting surface 102.

Specifically, for example, as shown in fig. 1, in one embodiment, after the visible light L is emitted from the light emitting element 2, the reflected visible light L is totally reflected by a part of the light guiding structure of the light guiding component 1, and is transmitted to the half-reflection diffusion medium 121 of the half-reflection diffusion layer 12, a part of the visible light L is transmitted and diffused to form a first visible light L1, another part of the visible light L is reflected and diffused to form a second visible light L2, and the first visible light L1 is emitted from the first light emitting surface 101, and the second visible light L2 is emitted from the second light emitting surface 102. In summary, the transflective layer can transmit and diffuse the visible light L emitted from the light emitting element 2 to form a first visible light L1 to be emitted from the first light emitting surface 101, and reflect and diffuse the visible light L to form a second visible light L2 to be emitted from the second light emitting surface 102, so as to realize bidirectional light emission of the backlight module 100.

Optionally, the material of the semi-transparent and semi-reflective diffusion medium 121 includes, but is not limited to, silica, titania, calcium carbonate powder, and the like, which can be used for transmission diffusion and reflection diffusion.

In the backlight module 100 provided in the present application, the light guide assembly 1 includes a light incident surface 103, a first light emergent surface 101 and a second light emergent surface 102, and the light emitting element 2 is disposed opposite to the light incident surface 103. The light guide assembly 1 further includes the half-reflection diffusion layer 12 having the half-reflection diffusion medium 121, where the half-reflection diffusion medium 121 is configured to transmit, reflect, and diffuse the visible light emitted by the light emitting element 2, so that the visible light is emitted from the first light emitting surface and the second light emitting surface. The semi-transparent and semi-reflective diffusion layer 12 can be used for evenly emitting the visible light emitted by the light emitting piece 2 from the first light emitting surface 101 and the second light emitting surface 102 which are arranged in a back-to-back mode, and an additional light emitting structure and a light guiding structure are not required to be arranged, so that the thickness of the backlight module 100 can be effectively reduced, the light and thin performance and the compactness of the backlight module 100 are improved, and further the cost of the backlight module 100 can be effectively reduced.

Further, it should be noted that, in the light guide assembly 1, the light intensity of the visible light is higher in the area close to the light emitting element 2, and the light intensity of the visible light is lower in the area far from the light emitting element 2. If the uniformity of the light output from the first light-emitting surface 101 and the second light-emitting surface 102 is required to be maintained, more of the half-transmitting and half-reflecting diffusion media 121 are required to be disposed in the area away from the light-emitting element 2 in the half-transmitting and half-reflecting diffusion layer 12, so that the light intensity of the visible light that is transmitted and diffused or reflected and diffused in the area away from the light-guiding element 1 of the light-emitting element 2 is similar to the light intensity of the visible light that is transmitted and diffused or reflected and diffused in the area close to the light-guiding element 1 of the light-emitting element 2.

In summary, in the half-back diffusion layer 12 of the present embodiment, the density of the half-back diffusion medium 121 gradually increases along the direction away from the light emitting element 2, so as to improve the overall light uniformity of the first light emitting surface 101 and the second light emitting surface 102 in the light guide assembly 1.

Further, as shown in fig. 2, the backlight module 100 further includes a first display panel 3 and a second display panel 4. Specifically, the first display panel 3 is disposed on the first light-emitting surface 101, and the second display panel 4 is disposed on the second light-emitting surface 102. The light guide assembly 1 is configured to homogenize visible light emitted from the light emitting element 2 and emit the visible light toward the first display panel 3 and the second display panel 4.

The light emitting element 2 is disposed opposite to the light incident surface 103, the first display panel 3 is disposed on the first light emitting surface 101, and the second display panel 4 is disposed on the second light emitting surface 102. In other words, the light guide assembly 1 has a plate-like structure, the light emitting element 2 is disposed on a side of the light guide assembly 1, and the first display panel 3 and the second display panel 4 are disposed on a front surface and a back surface of the light guide assembly 1, respectively.

The light emitting element 2 is configured to emit visible light, and direct the visible light to the light incident surface 103 of the light guide assembly 1, where the visible light is transmitted, diffused and reflected in the light guide assembly 1 after passing through the half-reflection diffusion layer 12, so that the visible light is emitted from the first light emitting surface 101 and the second light emitting surface 102, respectively, and the visible light can be finally emitted toward the directions of the first display panel 3 and the second display panel 4. The first display panel 3 and the second display panel 4 are configured to receive the visible light and form a display screen.

Referring to fig. 2 to 4, the light guide assembly 1 includes at least one TFT substrate 11 and at least one half-transmitting and half-reflecting diffusion layer 12.

The half-transmitting half-reflecting diffusion layer 12 is positioned between the TFT substrate 11 and the first display panel 3; and/or the semi-transparent semi-reflective diffusion layer 12 is located between the TFT substrate 11 and the second display panel 4; and/or the number of the TFT substrates 11 is two, and the half-transmitting and half-reflecting diffusion layer 12 is located between the two TFT substrates 11.

Specifically, referring to fig. 2, in one embodiment, the number of TFT substrates 11 is two, and the half-diffusion layer 12 is located between the two TFT substrates 11.

Referring to fig. 3, in one embodiment, the number of TFT substrates 11 is one, the number of the half-mirror diffusion layers 12 is one, and the half-mirror diffusion layers 12 are located between the TFT substrates 11 and the first display panel 3.

Referring to fig. 4, in one embodiment, the number of TFT substrates 11 is one, the number of the half-diffusion layers 12 is two, one of the half-diffusion layers 12 is located between the TFT substrate 11 and the first display panel 3, and the other half-diffusion layer 12 is located between the TFT substrate 11 and the second display panel 4.

The number and positions of the TFT substrate 11 and the half mirror diffusion layer 12 are not limited in this application, and should not be construed as limiting the present application.

It should be noted that, in the light guide assembly 1 of the present application, the TFT substrate replaces the light guide plate in the related art, and the combination of the TFT substrate 11 and the semi-transparent semi-reflective diffusion layer 12 may further realize the bi-directional light emission of the light guide assembly 1, without setting an additional light emitting structure and a light guiding structure, so that the thickness of the backlight module 100 may be effectively reduced.

Referring to fig. 5 and 6, the side surfaces of the light guide assembly 1 include the light incident surface 103, a first side surface 104, a second side surface 105, and a third side surface 106, which are sequentially connected.

The backlight module 100 further includes a reflective member 80, where the reflective member 80 is disposed on at least one of the first side 104, the second side 105, and the third side 106.

The reflecting member 80 is configured to reflect the visible light, and reflect and transmit the visible light in the light guide assembly 1, so that the visible light can exit from the first light exit surface 101 and the second light exit surface 102, and the visible light is prevented from exiting from at least one of the first side 104, the second side 105, and the third side 106, thereby improving the utilization ratio of the visible light emitted by the light emitting member 2.

Referring to fig. 7, the backlight module 100 further includes a first driving assembly 5, a second driving assembly 6, and a controller 7, wherein the first driving assembly 5 is electrically connected to the first display panel 3 and the controller 7, and the second driving assembly 6 is electrically connected to the second display panel 4 and the controller 7; the light emitting element 2 is electrically connected to the controller 7.

The first drive assembly 5 includes, but is not limited to, electronics such as drive IC, FPC, COF, and the second drive assembly 6 includes, but is not limited to, electronics such as drive IC, FPC, COF.

The controller 7 controls the deflection change of the liquid crystal in the first display panel 3 through the first driving component 5, so as to control the light transmission area and the display picture of the first display panel 3, and the controller 7 controls the deflection change of the liquid crystal in the second display panel 4 through the second driving component 6, so as to control the light transmission area and the display picture of the second display panel 4.

Specifically, the first driving component 5 is connected to the first display panel 3 through anisotropic conductive adhesive (ACF adhesive) and is electrically connected to the first display panel 3, and the second driving component 6 is connected to the second display panel 4 through anisotropic conductive adhesive (ACF adhesive) and is electrically connected to the second display panel 4.

The light emitting member 2 is electrically connected to the controller 7, and the controller 7 is further configured to control the light emitting brightness, the light emitting time, etc. of the light emitting member 2.

The backlight module 100 further includes a housing 90, and the first driving assembly 5, the second driving assembly 6, the light emitting member 2, and the controller 7 are disposed in the housing 90.

Referring to fig. 8 to 11, the first driving component 5 and the second driving component 6 are disposed on the same side of the light guide component 1; or, the first driving component 5 and the second driving component 6 are arranged on two opposite sides of the light guide component 1; or, the first driving component 5 and the second driving component 6 are arranged on two adjacent sides of the light guide component 1.

Referring to fig. 9, in one embodiment, the first driving component 5 and the second driving component 6 are disposed on the same side of the light guide component 1, and the first driving component 5 and the second driving component 6 can be fixedly connected with the first display panel 3 and the second display panel 4 only on one side during the preparation process, so that the first driving component 5 and the second driving component 6 can be conveniently fixed.

Specifically, referring to fig. 10, in one embodiment, the first driving unit 5, the second driving unit 6 and the light emitting element 2 are disposed on the same side of the light guiding unit 1. The other three sides of the light guide assembly 1 do not need to be provided with electronic devices, so that the liquid crystal display panel can be in borderless design at the positions corresponding to the other three sides of the light guide assembly 1, and the attractiveness and the space utilization rate of the liquid crystal display panel are improved.

Referring to fig. 8, in one embodiment, the first driving component 5 and the second driving component 6 are disposed on opposite sides of the light guiding component 1.

Referring to fig. 11, in one embodiment, the first driving component 5 and the second driving component 6 are disposed on two adjacent sides of the light guiding component 1.

The positions of the first driving unit 5 and the second driving unit 6 are not limited in this application, and should not be construed as limiting the present application.

Referring to fig. 12 to 14, in one embodiment, the number of the controllers 7 is 2, and the controllers 7 include a first controller 71 and a second controller 72.

By providing the first controller 72 and the second controller 72, the first controller 71 controls the first display panel 3, the second controller 72 controls the second display panel 4, thereby improving the control accuracy of the first display panel 3 and the second display panel 4, and improving the display effect of the first display panel 3 and the second display panel 4.

The first controller 71 is disposed on a side of the first display panel 3 facing away from the light guide assembly 1, and the second controller 72 is disposed on a side of the second display panel 4 facing away from the light guide assembly 1; or, the first controller 71 and the second controller 72 are both disposed on a side of the second display panel 4 facing away from the light guide assembly 1, and the first controller 71 and the second controller 72 are respectively disposed on two opposite sides of the light guide assembly 1.

Referring to fig. 12, in one embodiment, the first controller 71 is disposed on a side of the first display panel 3 facing away from the light guide assembly 1, and the second controller 72 is disposed on a side of the second display panel 4 facing away from the light guide assembly 1.

Specifically, in one embodiment, the light emitting element 2 is disposed on the same side of the light guide assembly 1 as the first controller 71 and the second controller 72.

Referring to fig. 13, in one embodiment, the light emitting element 2, the first controller 71 and the second controller 72 are disposed on different sides of the light guiding assembly 1, which is not limited in this application.

Referring to fig. 14, in an embodiment, the first controller 71 and the second controller 72 are both disposed on a side of the second display panel 4 facing away from the light guide assembly 1, and the first controller 71 and the second controller 72 are respectively disposed on two opposite sides of the light guide assembly 1.

Referring to fig. 1 and 15, the first display panel 3 includes a first array component 31, a first color film component 32 and a first external polarizing layer 33.

The first array component 31 is disposed on one side of the light guide component 1, and the first array component 31 includes a first internal polarizing layer 311, a first flat layer 312, a first array layer 313, and a first insulating layer 314 that are sequentially stacked along a direction away from the light guide component 1.

The first flat layer 312 is a high temperature resistant insulating layer, and is used for blocking the first array layer 313 and the first internal polarizing layer 311, so as to avoid adverse phenomena such as signal crosstalk and the like caused by high temperature of the first array layer 313.

The first array layer 313 includes a TFT wiring layer, a pixel electrode layer (ITO), and some other cooperating layer structure.

The first insulating layer 314 covers the first array layer 313, and is used for insulating the first array layer 313, preventing the first array layer 313 from being corroded by external water vapor, and improving the service life of the first array layer 313.

The first color film component 32 is disposed on one side of the first array component 31 facing away from the light guide component 1, and the first color film component 32 includes a first liquid crystal cell layer 321, a first color film layer 322 and a first substrate 323 that are sequentially stacked along a direction facing away from the light guide component 1.

The first liquid crystal cell layer 321 includes liquid crystal, spacers, conductive gold balls, frame glue, and the like.

The first color film layer 322 includes a color resist layer and a common electrode layer.

In this embodiment, the first substrate 323 may be a flexible substrate, and optionally, the first substrate 323 may be made of any one or more of the following materials: polyimide, polyethylene terephthalate (Polyethylene terephthalate, PET), polyethylene naphthalate (Polyethylene naphthalate two formic acid glycol estr, PEN), cyclic Olefin Polymer (COP), polycarbonate (PC), polystyrene (PS), polypropylene (PP), polytetrafluoroethylene (PTFE). In other implementations, the first substrate 323 may be a non-flexible substrate, such as glass, ceramic, etc., which is not limited in this application.

The first external polarizing layer 33 is disposed on a side of the first substrate 323 facing away from the light guide assembly 1.

Referring to fig. 1 and 16, the first internal polarizing layer 311 is used for polarizing, and the first external polarizing layer 33 is used for analyzing.

The second display panel 4 includes a second array component 41, a second color film component 42, and a second external polarizing layer 43.

The second array component 41 is disposed on one side of the light guide component 1, and the second array component 41 includes a second internal polarizing layer, a second flat layer, a second array layer, and a second insulating layer that are sequentially stacked along a direction away from the light guide component 1.

The second color film assembly 42 is disposed on a side of the second array assembly 41 facing away from the light guide assembly 1, and the second color film assembly 42 includes a second liquid crystal box layer, a second color film layer and a second substrate that are sequentially stacked along a direction facing away from the light guide assembly 1.

The second external polarizing layer 43 is disposed on a side of the second substrate facing away from the light guide assembly 1.

The respective layer structures in the second display panel 4 are similar to those in the first display panel 3 described above, which is not limited in this application.

Referring to fig. 17, the present application provides a method for preparing a backlight module 100, where the method for preparing the backlight module 100 is used for preparing the backlight module 100, and the method for preparing the backlight module 100 includes the following specific steps of S100, S300 and S500, and S100, S300 and S500.

S100: the light guide assembly 1 is formed, and the light emitting element 2 is provided on the light incident surface 103 side of the light guide assembly 1.

S300: a first display panel 3 is formed on the first light emitting surface 101 of the light guide assembly 1.

S500: a second display panel 4 is formed on the second light emitting surface 102 of the light guide assembly 1.

Referring to fig. 18, step S300 "includes steps S310, S320, S330 and S340 of forming a first display panel 3" on one side of the light guide assembly 1, and steps S310, S320, S330 and S340 are as follows.

S310: a first array assembly 31 is formed at one side of the light guide assembly 1.

S310 "forming the first array element 31" on one side of the light guide element 1 further includes S311, S312 and S313, and S311, S312 and S313 are as follows.

S311: the first internal polarizing layer 311 is formed at one side of the light guide assembly 1.

S312: the first planarization layer 312 is set by means of router or Coating, etc.

S313: the first array layer 313 is prepared by Sputter, coating, developing, etching, etc.

S314: the first insulating layer 314 is prepared by Sputter, coating, development, etching, or the like.

S320: forming a first color film assembly 32.

S320 "further includes S321, S322, and S323, and S321, S322, and S323 are as follows.

S321: the first substrate 323 is provided, and a color resist layer is prepared on the first substrate 323 by Coating development etching.

S322: the transparent common electrode layer is prepared by using a dispenser, and the first color film layer 322 is formed.

S323: the first liquid crystal cell layer 321 is formed by arranging liquid crystal, spacers, conductive gold balls and frame glue.

S330: the first array assembly 31 and the first color film assembly 32 are vacuum-boxed.

S340: a first external polarizing layer 33 is attached to a side of the first color film substrate facing away from the first array component 31, so as to form a first display panel 3.

Referring to fig. 19, the step S500 of forming the second display panel 4 on the other side of the light guide assembly 1 includes steps S510, S520, S530 and S540, and the steps S510, S520, S530 and S540 are as follows.

S510: a second array member 41 is formed at the other side of the light guide member 1.

S520: forming a second color film assembly 42.

S530: the second array assembly 41 and the second color film assembly 42 are vacuum-boxed.

S540: a second external polarizing layer 43 is attached to a side of the second color film substrate facing away from the second array assembly 41, so as to form a second display panel 4.

The specific steps for forming the second display panel 4 are similar to those for forming the first display panel 3, and are not described herein. In the embodiment of the present application, after the first array module 31 and the first color film module 32 are vacuum-formed into a box, and the second array module 41 and the second color film module 42 are vacuum-formed into a box, the two box-formed modules and the light guide module 1 may be first combined, and then the first external polarizing layer 33 and the second external polarizing layer 43 may be sequentially attached.

The preparation method of the backlight module 100 further includes steps S600, S700 and S800, and the specific steps of S600, S700 and S800 are as follows.

S600: the first driving assembly 5 and the first display panel 3 are connected using an anisotropic conductive paste (ACF paste), and the second driving assembly 6 and the second display panel 4 are connected using an anisotropic conductive paste (ACF paste).

S700: an insulating adhesive is coated at the connection of the first driving assembly 5 and the first display panel 3, and an insulating adhesive is coated at the connection of the second driving assembly 6 and the second display panel 4.

S800: the reflecting strips are attached to the non-light-incident side surface of the light guide assembly 1, and the structures of the light guide assembly 1, the first display panel 3, the second display panel 4 and the like are arranged in a shell with the light emitting piece 2 to form the backlight module 100 with double-sided display.

The application also provides a liquid crystal display device, which comprises the backlight module 100. The liquid crystal display device includes, but is not limited to, display devices such as mobile phones and computers. While the foregoing is directed to embodiments of the present application, it will be appreciated by those of ordinary skill in the art that numerous modifications and variations can be made without departing from the principles of the present application, and such modifications and variations are also considered to be within the scope of the present application.

Claims

1. A backlight module, comprising:

the luminous piece is used for emitting visible light;

the light guide assembly comprises a first light-emitting surface, a second light-emitting surface and a light-entering surface, wherein the first light-emitting surface and the second light-emitting surface are arranged in a back-to-back mode, the light-entering surface is connected between the first light-emitting surface and the second light-emitting surface, and the light-emitting piece is arranged opposite to the light-entering surface; the light guide assembly further comprises at least one half-transparent half-reflective diffusion layer, a half-transparent half-reflective diffusion medium is arranged in the half-transparent half-reflective diffusion layer and used for transmitting, reflecting and diffusing visible light emitted by the light emitting piece so that the visible light is emitted from the first light emitting surface and the second light emitting surface, and the density of the half-transparent half-reflective diffusion medium is gradually increased along the direction deviating from the light emitting piece in the half-transparent half-reflective diffusion layer;

the backlight module further comprises a first display panel and a second display panel, wherein the first display panel is arranged on the first light-emitting surface, and the second display panel is arranged on the second light-emitting surface; the light guide component comprises at least one TFT substrate and at least one semi-transparent semi-reflective diffusion layer; the semi-transparent semi-reflective diffusion layer is positioned between the TFT substrate and the first display panel; and/or the semi-transparent semi-reflective diffusion layer is positioned between the TFT substrate and the second display panel; and/or the number of the TFT substrates is two, and the semi-transparent and semi-reflective diffusion layer is positioned between the two TFT substrates; wherein, the luminous element is arranged corresponding to the TFT substrate.

2. The backlight module according to claim 1, wherein the side surface of the light guide assembly comprises the light incident surface, a first side surface, a second side surface, and a third side surface which are sequentially connected;

3. The backlight module according to claim 1, further comprising a first driving assembly, a second driving assembly and a controller, wherein the first driving assembly is electrically connected to the first display panel and the controller, respectively, and the second driving assembly is electrically connected to the second display panel and the controller, respectively; the luminous element is electrically connected with the controller.

4. A backlight module according to claim 3, wherein the first driving component and the second driving component are disposed on the same side of the light guide component; or alternatively, the first and second heat exchangers may be,

5. A backlight module according to claim 3, wherein the controller comprises a first controller and a second controller;

6. The backlight module according to claim 1, wherein the first display panel comprises:

the second display panel includes:

7. A method for manufacturing a backlight module according to any one of claims 1 to 6, the method comprising:

8. The method of claim 7, wherein forming a first display panel on one side of the light guide assembly comprises:

forming a first array assembly on one side of the light guide assembly;

forming a first color film component;

forming a second display panel on the other side of the light guide assembly, including:

forming a second array assembly on the other side of the light guide assembly;

forming a second color film component;

9. A liquid crystal display device comprising the backlight module of any one of claims 1-6.