CN114624809B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
- Publication number
- CN114624809B CN114624809B CN202210312670.1A CN202210312670A CN114624809B CN 114624809 B CN114624809 B CN 114624809B CN 202210312670 A CN202210312670 A CN 202210312670A CN 114624809 B CN114624809 B CN 114624809B
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- Prior art keywords
- backlight module
- guide plate
- light guide
- groove
- light
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- 239000012788 optical film Substances 0.000 claims abstract description 69
- 239000010408 film Substances 0.000 claims description 36
- 238000009792 diffusion process Methods 0.000 claims description 12
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000005282 brightening Methods 0.000 claims 5
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 11
- 230000002708 enhancing effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/0091—Positioning aspects of the light source relative to the light guide
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and a display device, which relate to the technical field of display, wherein the backlight module comprises: a light emitting region and a frame region surrounding the light emitting region; the light guide plate is provided with a lamp groove at one side along a first direction, the lamp groove is positioned in the frame area, and at least part of the lamp groove penetrates through the light guide plate along a direction perpendicular to the plane where the backlight module is positioned, wherein the first direction is parallel to the plane where the backlight module is positioned; the light source component is at least partially embedded in the lamp groove; the first optical film and the second optical film are respectively positioned at two sides of the light guide plate along the direction perpendicular to the plane where the backlight module is positioned. The invention is beneficial to realizing the light and thin design.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
Currently, the double-sided display technology has been widely used in various industries, such as: business, communications industries, government service windows, financial industries, transportation industries, and the like. In the prior art, display panels are respectively arranged on two sides of a backlight module with double-sided light emission to realize double-sided display.
In the prior art, the backlight module with double-sided light emission has the problems of complex structure and larger overall thickness, and is unfavorable for light and thin design.
Disclosure of Invention
In view of this, the present invention provides a backlight module and a display device, which are beneficial to realizing light and thin design.
The invention provides a backlight module, comprising: a light emitting region and a frame region surrounding the light emitting region; the light guide plate is provided with a lamp groove at one side along a first direction, the lamp groove is positioned in the frame area, and at least part of the lamp groove penetrates through the light guide plate along a direction perpendicular to the plane where the backlight module is positioned, wherein the first direction is parallel to the plane where the backlight module is positioned; the light source component is at least partially embedded in the lamp groove; the first optical film and the second optical film are respectively positioned at two sides of the light guide plate along the direction perpendicular to the plane where the backlight module is positioned.
Based on the same thought, the invention also provides a display device, which comprises a backlight module and two display panels, wherein the two display panels are respectively arranged at two sides of the backlight module along the direction perpendicular to the plane of the backlight module; the backlight module is the backlight module.
Compared with the prior art, the backlight module and the display device provided by the invention have the advantages that at least the following effects are realized:
the backlight module provided by the invention is a side-in type backlight module, and the backlight module comprises a light guide plate and a light source assembly. And a lamp groove is arranged on one side of the light guide plate along the first direction, is positioned in the frame area and at least penetrates through part of the light guide plate along the direction perpendicular to the plane where the backlight module is positioned, wherein the first direction is parallel to the plane where the backlight module is positioned. The light source assembly is at least partially embedded in the lamp groove, light emitted by the light source assembly is incident into the light guide plate from the side wall of the lamp groove to be mixed into a surface light source, and is transmitted by the light guide plate and then emitted from the first light emitting surface and the second light emitting surface of the backlight module, and the first light emitting surface and the second light emitting surface are respectively positioned at two sides of the backlight module along the direction perpendicular to the plane of the backlight module, so that the first light emitting surface and the second light emitting surface of the backlight module can be used for providing light sources for the display panel, and double-sided display is realized. Meanwhile, the light source component is at least partially embedded in the lamp groove, so that the light source component can be protected, the risk of damage to the light source component caused by external force is reduced, and the service life is prolonged.
In the backlight module provided by the invention, the light source component, the first optical film and the second optical film are borne by the light guide plate, so that a rubber frame structure and/or an iron frame structure is not required to be arranged in the backlight module for bearing one or more of the light source component, the first optical film and the second optical film, the backlight module is simple in structure, the process is effectively reduced, and the production cost is reduced; and is favorable for realizing the light and thin design of the backlight module.
Of course, it is not necessary for any one product to practice the invention to achieve all of the technical effects described above at the same time.
Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a backlight module according to the present invention;
FIG. 2 is a cross-sectional view of the backlight module shown in FIG. 1 along A-A';
FIG. 3 is a schematic diagram of another backlight module according to the present invention;
FIG. 4 is another cross-sectional view of the backlight module shown in FIG. 1 along A-A';
FIG. 5 is a schematic diagram of a structure of a light guide plate in the backlight module shown in FIG. 4;
fig. 6 is a schematic structural diagram of another light guide plate according to the present invention;
fig. 7 is a schematic structural view of another light guide plate according to the present invention;
fig. 8 is a schematic structural view of another light guide plate according to the present invention;
fig. 9 is a schematic structural view of another light guide plate according to the present invention;
fig. 10 is a schematic structural view of another light guide plate according to the present invention;
FIG. 11 is a schematic plan view of another light guide plate according to the present invention;
fig. 12 is a schematic plan view of a light guide plate according to still another embodiment of the present invention;
fig. 13 is a schematic plan view of a light guide plate according to still another embodiment of the present invention;
FIG. 14 is a further cross-sectional view of the backlight module shown in FIG. 1 along A-A';
fig. 15 is a schematic plan view of a display device according to the present invention;
fig. 16 is a cross-sectional view of the display device of fig. 15 taken along D-D'.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 is a schematic plan view of a backlight module according to the present invention, and fig. 2 is a cross-sectional view of the backlight module shown in fig. 1 along A-A', referring to fig. 1 and fig. 2, the present embodiment provides a backlight module for providing a light source to a display panel. The backlight module comprises a light-emitting area FA and a frame area NA surrounding the light-emitting area FA, light rays emitted by the backlight module are emitted from the light-emitting area FA, and light rays emitted by the backlight module are not emitted from the frame area NA.
The backlight module is a side-in type backlight module, and comprises a light guide plate 10 and a light source assembly 20. Along a first direction X, a light groove 11 is disposed on one side of the light guide plate 10, the light groove 11 is located in the frame area NA, and along a direction perpendicular to the plane of the backlight module, the light groove 11 at least penetrates through a portion of the light guide plate 10, wherein the first direction X is parallel to the plane of the backlight module. The light source assembly 20 is at least partially embedded in the lamp groove 11, light emitted by the light source assembly 20 is incident into the light guide plate 10 from the side wall of the lamp groove 11 to be mixed and converted into a surface light source, the surface light is conducted by the light guide plate 10 and then emitted from the first light emitting surface S1 and the second light emitting surface S2 of the backlight module, and the first light emitting surface S1 and the second light emitting surface S2 are respectively positioned at two sides of the backlight module along the direction perpendicular to the plane of the backlight module, so that the first light emitting surface S1 and the second light emitting surface S2 of the backlight module can be used for providing light sources for the display panel, and double-sided display is realized. Meanwhile, the light source component 20 is at least partially embedded in the lamp groove 11, so that the light source component 20 can be protected, the risk of damage to the light source component 20 caused by external force is reduced, and the service life is prolonged.
It should be noted that, in the present embodiment, the light groove 11 at least penetrates part of the light guide plate 10 along the direction perpendicular to the plane of the backlight module means that the light groove 11 does not completely penetrate the light guide plate 10 and the light groove 11 completely penetrates the light guide plate 10 along the direction perpendicular to the plane of the backlight module.
It should be noted that, fig. 2 exemplarily illustrates that the light groove 11 does not completely penetrate the light guide plate 10 in a direction perpendicular to the plane of the backlight module, which is beneficial to improving the structural strength of the light guide plate 10. Of course, in other embodiments of the present invention, the light groove 11 may also penetrate the light guide plate 10 along a direction perpendicular to the plane of the backlight module, and the present invention will not be described herein.
The backlight module further comprises a first optical film 30 and a second optical film 40, and the first optical film 30 and the second optical film 40 are respectively positioned at two sides of the light guide plate 10 along the direction perpendicular to the plane of the backlight module. The first optical film 30 is disposed on a side of the light guide plate 10 near the first light emitting surface S1, and the first optical film 30 is used to adjust the light source emitted from the first light emitting surface S1 of the backlight module to improve the light emitting effect of the light source emitted from the first light emitting surface S1 of the backlight module. The second optical film 40 is disposed on a side of the light guide plate 10 near the second light emitting surface S2, and the second optical film 40 is used for adjusting the light source emitted from the second light emitting surface S2 of the backlight module to improve the light emitting effect of the light source emitted from the second light emitting surface S2 of the backlight module. It should be noted that, in the present embodiment, the first optical film 30 is exemplarily shown to be disposed on the side of the light guide plate 10 near the first light emitting surface S1, the second optical film 40 is disposed on the side of the light guide plate 10 near the second light emitting surface S2, and in other embodiments of the present invention, it may also be configured that the first optical film 30 is disposed on the side of the light guide plate 10 near the second light emitting surface S2, and the second optical film 40 is disposed on the side of the light guide plate 10 near the first light emitting surface S1.
In the backlight module provided by the embodiment, the light source assembly 20, the first optical film 30 and the second optical film 40 are carried by the light guide plate 10, so that a rubber frame structure and/or an iron frame structure is not required to be arranged in the backlight module for carrying one or more of the light source assembly 20, the first optical film 30 and the second optical film 40, the backlight module is simple in structure, the process is effectively reduced, and the production cost is reduced; and is favorable for realizing the light and thin design of the backlight module.
With continued reference to fig. 1 and 2, in some alternative embodiments, the first optical film 30 includes a first diffusion sheet 31, a first brightness enhancing sheet 32, and a second brightness enhancing sheet 33, where the first brightness enhancing sheet 32 is located on a side of the first diffusion sheet 31 away from the light guide plate 10, and the second brightness enhancing sheet 33 is located on a side of the first brightness enhancing sheet 32 away from the light guide plate 10, along a direction perpendicular to a plane in which the backlight module is located.
The first diffusion sheet 31 diffuses particles by using PMMA (polymethyl methacrylate ) to make light be irregularly refracted, so that the light source emitted from the first light emitting surface S1 of the backlight module is more uniform. The first and second brightness enhancement fins 32 and 33 can make more light rays of the light sources emitted from the first light-emitting surface S1 of the backlight module emit along the direction perpendicular to the plane of the backlight module, so as to improve the light-emitting brightness of the light sources emitted from the first light-emitting surface S1 of the backlight module.
The second optical film 40 includes a second diffusion sheet 41, a third brightness enhancement sheet 42 and a fourth brightness enhancement sheet 43, which are sequentially disposed, and along a direction perpendicular to a plane where the backlight module is located, the third brightness enhancement sheet 42 is located at a side of the second diffusion sheet 41 away from the light guide plate 10, and the fourth brightness enhancement sheet 43 is located at a side of the third brightness enhancement sheet 42 away from the light guide plate 10.
The second diffusion sheet 41 can also utilize PMMA to diffuse particles to make light be irregularly refracted, so that the light source emitted from the second light emitting surface S2 of the backlight module is more uniform. The third and fourth brightness enhancement films 42 and 43 can make more light rays of the light sources emitted from the second light-emitting surface S2 of the backlight module emit along the direction perpendicular to the plane of the backlight module, so as to improve the light-emitting brightness of the light sources emitted from the second light-emitting surface S of the backlight module.
It should be noted that, in this embodiment, the first optical film 30 is exemplarily shown to include the first diffusion sheet 31, the first brightness enhancing sheet 32 and the second brightness enhancing sheet 33, the second optical film 40 includes the second diffusion sheet 41, the third brightness enhancing sheet 42 and the fourth brightness enhancing sheet 43 that are sequentially disposed, and in other embodiments of the present invention, the first optical film 30 and the second optical film 40 may further include other types of optical films, which are not described herein.
With continued reference to fig. 1 and 2, in some alternative embodiments, the light source assembly 20 includes a light source 21 and a circuit board 22, the light source 21 being electrically connected to the circuit board 22, the light source 21 being controllable to be turned on and off by circuitry of the circuit board 22.
The light source 21 is embedded in the lamp groove 11, light emitted by the light source 21 is incident into the light guide plate 10 from the side wall of the lamp groove 11 to be mixed light, converted into a surface light source, and then emitted from the first light emitting surface S1 and the second light emitting surface S2 of the backlight module after being conducted by the light guide plate 10, so that the first light emitting surface S1 and the second light emitting surface S2 of the backlight module can be used for providing light sources for the display panel, and double-sided display is realized. The light source 21 is embedded in the lamp groove 11, so that more light can enter the light guide plate 10, and the light utilization rate is improved. Meanwhile, the light source 21 is embedded in the lamp groove 11, so that the light source 21 can be protected, the risk of damage to the light source 21 caused by external force is reduced, and the service life is prolonged. And the light source 21 is embedded in the lamp groove 11, so that the thickness of the backlight module is prevented from being increased due to the fact that the light source 21 is arranged on one side of the light guide plate 10 along the direction perpendicular to the plane of the backlight module, and the thickness of the backlight module is effectively reduced.
With continued reference to fig. 1 and 2, in some alternative embodiments, the vertical projection of the light-emitting area FA on the plane of the backlight module is located in the vertical projection of the first optical film 30 on the plane of the backlight module, that is, the first optical film 30 covers the entire light-emitting area FA. Since the first optical film 30 can adjust the light source emitted from the first light emitting surface S1 of the backlight module to improve the light emitting effect of the light source emitted from the first light emitting surface S1 of the backlight module, the first optical film 30 covers the entire light emitting area FA, so as to improve the light emitting effect of the light source emitted from the area corresponding to the light emitting area FA in the first light emitting surface S1 of the backlight module. And the vertical projection of the light emitting area FA on the plane of the backlight module is located in the vertical projection of the first optical film 30 on the plane of the backlight module, i.e. the size of the first optical film 30 is larger than the size of the light emitting area FA, which is beneficial to reducing the alignment difficulty of the first optical film 30.
The vertical projection of the light emitting area FA on the plane of the backlight module is located in the vertical projection of the second optical film 40 on the plane of the backlight module, that is, the second optical film 40 covers the entire light emitting area FA. Since the second optical film 40 can adjust the light source emitted from the second light emitting surface S2 of the backlight module to improve the light emitting effect of the light source emitted from the second light emitting surface S2 of the backlight module, the second optical film 40 covers the entire light emitting area FA, so as to improve the light emitting effect of the light source emitted from the area corresponding to the light emitting area FA in the second light emitting surface S2 of the backlight module. And the vertical projection of the light emitting area FA on the plane of the backlight module is located in the vertical projection of the second optical film 40 on the plane of the backlight module, i.e. the size of the second optical film 40 is larger than the size of the light emitting area FA, which is beneficial to reducing the alignment difficulty of the second optical film 40.
It should be noted that, in fig. 1 and fig. 2 exemplarily show that the light emitting area FA located on the first light emitting surface S1 of the backlight module and the light emitting area FA located on the second light emitting surface S2 of the backlight module overlap, in other embodiments of the present invention, referring to fig. 3, fig. 3 is a schematic structural diagram of another backlight module provided by the present invention, the light emitting area FA includes a first light emitting area FA1 located on the first light emitting surface S1 of the backlight module and a second light emitting area FA2 located on the second light emitting surface S2 of the backlight module, the frame area NA includes a first frame area NA1 located on the first light emitting surface S1 of the backlight module and a second frame area NA2 located on the second light emitting surface S2 of the backlight module, the first frame area NA1 surrounds the first light emitting area FA1, the second frame area NA2 surrounds the second light emitting area FA2, and the setting ranges of the first light emitting area FA1 located on the first light emitting surface S1 of the backlight module and the second light emitting area FA2 located on the second light emitting surface S2 of the backlight module are different. Of course, in other embodiments of the present invention, the first light emitting area FA1 located on the first light emitting surface S1 of the backlight module and the second light emitting area FA2 located on the second light emitting surface S2 of the backlight module may have other corresponding relationships, which are not described herein in detail.
Fig. 4 is another cross-sectional view of the backlight module shown in fig. 1 along A-A', fig. 5 is a schematic structural view of a light guide plate in the backlight module shown in fig. 4, and referring to fig. 1, fig. 4 and fig. 5, in some alternative embodiments, a first film groove 12 is disposed on a side of the light guide plate 10, which is close to the first optical film 30, along a direction perpendicular to a plane of the backlight module, where the first film groove 12 does not penetrate the light guide plate 10, and the first optical film 30 may be embedded in the first film groove 12, so that the overall stability is improved when the first optical film 30 is carried by the light guide plate 10. And one side of the light guide plate 10 is provided with a first diaphragm groove 12, and the first optical diaphragm 30 is embedded in the first diaphragm groove 12, so that the thickness of the backlight module is reduced, and the light and thin design of the backlight module is realized.
Along the direction perpendicular to the plane of the backlight module, a second film groove 13 is formed in one side, close to the second optical film 40, of the light guide plate 10, the second film groove 13 does not penetrate through the light guide plate 10, the second optical film 40 can be embedded in the second film groove 13, and overall stability is improved when the second optical film 40 is borne by the light guide plate 10. And one side of the light guide plate 10 is provided with a second diaphragm groove 13, and the second optical diaphragm 40 is embedded in the second diaphragm groove 13, so that the thickness of the backlight module is reduced, and the light and thin design of the backlight module is realized.
With continued reference to fig. 1, 4 and 5, in some alternative embodiments, the depth of the first film groove 12 is the same as the thickness of the first optical film 30 along the direction perpendicular to the plane of the backlight module, and the first optical film 30 may be completely embedded in the first film groove 12, so as to facilitate reducing the thickness of the backlight module, and simultaneously form a relatively flat surface, so as to facilitate the subsequent arrangement of the film layer.
Along the direction perpendicular to the plane of the backlight module, the depth of the second film groove 13 is the same as the thickness of the second optical film 40, and the second optical film 40 can be completely embedded in the second film groove 13, so that the thickness of the backlight module is reduced, a relatively flat surface can be formed, and the subsequent film layer arrangement is facilitated.
With continued reference to fig. 1, fig. 4, and fig. 5, in some alternative embodiments, the light groove 11 and the first film groove 12 are located on the same side of the light guide plate 10, and the light groove 11 is located on a side of the first film groove 12 facing the second film groove 13, the light source 21 is located in the light groove 11, and light emitted by the light source 21 is incident into the light guide plate 10 from a side wall of the light groove 11 to be mixed and converted into a surface light source, and is conducted by the light guide plate 10 and then emitted from the first light emitting surface S1 and the second light emitting surface S2 of the backlight module, so that both the first light emitting surface S1 and the second light emitting surface S2 of the backlight module can be used to provide a light source for the display panel, thereby realizing double-sided display.
The light source 21 is embedded in the lamp groove 11, and the circuit board 22 is positioned in the first diaphragm groove 12, so that the thickness of the backlight module is reduced, and the light and thin design of the backlight module is realized. Meanwhile, the light source 21 is embedded in the lamp groove 11, and the circuit board 22 is positioned in the first diaphragm groove 12, so that the arrangement of the light source 21 and the circuit board 22 is prevented from influencing the arrangement of the subsequent diaphragm layers.
Fig. 6 is a schematic structural diagram of another light guide plate provided in the present invention, referring to fig. 6, in some alternative embodiments, a plurality of grooves 50 are formed on a surface of at least one side of the light guide plate 10 along a direction perpendicular to a plane of the backlight module.
The grooves 50 are located in the first diaphragm groove 12, that is, a plurality of grooves 50 are arranged on the surface of the light guide plate 10, which is close to the first diaphragm groove 12, and the grooves 50 have a light condensing effect, so that the brightness of the light source emitted from the light guide plate 10, which is close to the first diaphragm groove 12, is effectively improved.
The grooves 50 may also be located in the second film groove 13, that is, the surface of the light guide plate 10 near the side of the second film groove 13 is provided with a plurality of grooves 50, and the grooves 50 have a light-focusing effect, so that the brightness of the light source emitted from the side of the light guide plate 10 near the second film groove 13 is effectively improved.
It should be noted that, in fig. 6, the grooves 50 are exemplarily shown in the first film groove 12 and the second film groove 13, and in other embodiments of the present invention, referring to fig. 7, fig. 7 is a schematic structural diagram of another light guide plate provided in the present invention, and the grooves 50 may be provided only in the first film groove 12. Of course, in other embodiments, the groove 50 may be disposed only in the second diaphragm groove 13, which is not described herein.
Alternatively, the grooves 50 and the light guide plate 10 may be integrally formed by injection molding, and the manufacturing method is simple and the structural reliability is high.
With continued reference to fig. 6, in some alternative embodiments, the grooves 50 on the same side of the light guide plate 10 are uniformly arranged, and the light source emitted from the surface of the side of the light guide plate 10 provided with the grooves 50 is more uniform due to the light-focusing effect of the grooves 50, so as to improve the brightness of the emitted light.
Fig. 8 is a schematic structural diagram of another light guide plate according to the present invention, and referring to fig. 8, in some alternative embodiments, a surface on at least one side of the light guide plate 10 is provided with a plurality of dots 60 along a direction perpendicular to a plane of the backlight module.
The dots 60 are located in the first diaphragm groove 12, and light provided by the light source enters the light guide plate 10 and is totally reflected in the light guide plate 10 for multiple times, and then is spread into the whole light guide plate 10, and when the light propagates to the dots 60 in the first diaphragm groove 12, diffuse reflection occurs and is emitted from one side of the light guide plate 10 where the first diaphragm groove 12 is arranged. The arrangement of the mesh points 60 can make the light source emitted from the surface of the light guide plate 10 on the side provided with the mesh points 60 more uniform, and improve the brightness of the emitted light.
The dots 60 may also be located in the second film groove 13, and the light provided by the light source enters the light guide plate 10 and is totally reflected in the light guide plate 10 for multiple times, so as to spread into the whole light guide plate 10, and when the light propagates to the dots 60 in the second film groove 13, diffuse reflection occurs and is emitted from the side of the light guide plate 10 provided with the second film groove 13. By arranging the mesh points 60, the light source emitted by the surface of the side of the light guide plate 10 provided with the mesh points 60 is more uniform, and the brightness of the emitted light is improved.
It should be noted that, in fig. 8, the first film groove 12 and the second film groove 13 are exemplarily shown to have the dots 60, and in other embodiments of the present invention, referring to fig. 9, fig. 9 is a schematic structural diagram of another light guide plate provided in the present invention, and the dots 60 may be provided only in the first film groove 12. Of course, in other embodiments, the mesh point 60 may be disposed only in the second diaphragm groove 13, which is not described in detail herein.
Alternatively, the mesh point 60 and the light guide plate 10 may be integrally formed by injection molding, and the manufacturing method is simple and the structural reliability is high.
Alternatively, the dots 60 may have a hemispherical shape, a conical shape, a trapezoid shape, etc., which is not particularly limited in the present invention, and may be set according to actual production requirements.
Fig. 10 is a schematic view of another structure of a light guide plate according to the present invention, referring to fig. 10, in some alternative embodiments, a groove 50 may be disposed on one side of the light guide plate 10 and a dot 60 may be disposed on the other side of the light guide plate 10 along a direction perpendicular to a plane of the backlight unit, and in fig. 10, the groove 50 may be disposed in the first film groove 12 and the dot 60 may be disposed in the second film groove 13 as shown in an exemplary manner. Of course, in other embodiments of the present invention, the mesh point 60 may be disposed in the first diaphragm groove 12, and the groove 50 may be disposed in the second diaphragm groove 13, which will not be described herein.
Fig. 11 is a schematic plan view of another light guide plate according to the present invention, and referring to fig. 11, in some alternative embodiments, the unit density of dots 60 located on the same side of the light guide plate 10 is gradually increased along the first direction X and toward the direction away from the light source assembly 20.
The light emitted from the light source assembly 20 located at one side of the light guide plate 10 along the first direction X is incident into the light guide plate 10 to be mixed and converted into a surface light source, and is transmitted by the light guide plate 10 and then emitted from the light emitting surface of the light guide plate 10, and the light emitting surface of the light guide plate 10 is located at two sides of the light guide plate 10 along the direction of the plane of the backlight module. In the prior art, when the dots 60 are not provided, the brightness of the area of the light guide plate 10 closer to the light source module 20 along the first direction X is higher. Since the larger the unit density of the dots 60 in a certain area of the light guide plate 10, the larger the increase of the brightness of the light emitted from the area, in this embodiment, the unit density of the dots 60 located on the same side of the light guide plate 10 along the first direction X and facing away from the light source assembly 20 gradually increases, so that the brightness of the light emitted from each area in the light emitting surface of the light guide plate 10 can be adjusted, so that the brightness of the light source emitted from the surface of the light guide plate 10 on the side provided with the dots 60 is more uniform.
Fig. 12 is a schematic plan view of yet another light guide plate provided in the present invention, referring to fig. 12, in some alternative embodiments, the light guide plate 10 includes a central region BB1 and an edge region BB2 at least partially surrounding the central region BB1, and dots 60 are disposed in both the central region BB1 and the edge region BB 2.
In the prior art, the light source emitted from the portion of the light guide plate 10 located in the edge region BB2 has a high luminance due to the fact that the portion of the light guide plate 10 located in the edge region BB2 tends to generate light condensation. Therefore, in the dot 60 on the same side of the light guide plate 10, the unit density of the dot 60 in the edge area BB2 may be smaller than that of the dot 60 in the central area BB1, so that the brightness of the light source emitted from the area corresponding to the central area BB1 in the light guide plate 10 and the brightness of the light source emitted from the area corresponding to the edge area BB2 in the light guide plate 10 tend to be the same, thereby effectively improving the problem of higher brightness of the light source emitted from the portion of the light guide plate 10 located in the edge area BB2 in the prior art, and making the brightness of the light source emitted from the light guide plate 10 more uniform.
Fig. 13 is a schematic plan view of still another light guide plate according to the present invention, referring to fig. 13, in some alternative embodiments, the first film groove 12 includes a dot setting portion CC1 and a non-dot portion CC2 disposed around the dot setting portion CC1, wherein the dot 60 is disposed in the dot setting portion CC1, and the non-dot portion CC2 is not disposed with the dot 60.
In the prior art, the light source emitted from the portion of the light guide plate 10 located at the edge has high brightness due to the fact that the portion of the light guide plate 10 located at the edge is prone to light condensation. In this embodiment, the first diaphragm groove 12 includes the dot setting portion CC1 and the non-dot portion CC2 disposed around the dot setting portion CC1, where the dot setting portion CC1 is located in the middle area of the light guide plate 10, the non-dot portion CC2 is located in the edge area of the light guide plate 10, and the dot 60 can be disposed only in the middle area of the light guide plate 10, and the edge area of the light guide plate 10 is not provided with the dot 60, so as to effectively solve the problem of higher brightness of the light source emitted from the edge area of the light guide plate 10 in the prior art, and make the brightness of the light source emitted from the surface of the side of the light guide plate 10 provided with the dot 60 more uniform.
The non-dot portion CC2 includes a first sub-portion CC21, and the first sub-portion CC21 is located on a side of the light guide plate 10 away from the light source assembly 20 along the first direction X, and a width of the first sub-portion CC21 is d1 along the first direction X, where d1 is greater than or equal to 0.5mm and less than or equal to 1mm. When d1 is less than 0.5mm, the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the first sub-portion CC21 is high, and when d1 is greater than 1mm, the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the first sub-portion CC21 is low. Therefore, when 0.5 mm.ltoreq.d1.ltoreq.1 mm, the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the first sub-portion CC21 and the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the halftone dot setting portion CC1 tend to be the same, so that the luminance of the light source emitted from the light guide plate 10 is more uniform.
The non-dot portion CC2 includes a second sub-portion CC22, and the second sub-portion CC22 is located on one side of the light guide plate 10 along the second direction Y, where the first direction X intersects with the second direction Y, and the width of the second sub-portion CC22 is d2 along the second direction Y, where 0.5mm is less than or equal to d2 is less than or equal to 1mm. When d2 is less than 0.5mm, the brightness of the light source emitted from the region of the light guide plate 10 corresponding to the second sub-portion CC22 is high, and when d2 is greater than 1mm, the brightness of the light source emitted from the region of the light guide plate 10 corresponding to the second sub-portion CC22 is low. Therefore, when 0.5 mm.ltoreq.d2.ltoreq.1 mm, the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the second sub-portion CC22 and the luminance of the light source emitted from the region of the light guide plate 10 corresponding to the halftone dot setting portion CC1 tend to be the same, so that the luminance of the light source emitted from the light guide plate 10 is more uniform.
It should be noted that, in fig. 13, the first diaphragm groove 12 is exemplarily shown to include the dot setting portion CC1 and the non-dot portion CC2 disposed around the dot setting portion CC1, and in other embodiments of the present invention, the second diaphragm groove may also include the dot setting portion and the non-dot portion disposed around the dot setting portion, and the corresponding structure may refer to the structure described in fig. 13, and the disclosure of the present invention is not repeated herein.
Fig. 14 is a cross-sectional view of the backlight module shown in fig. 1 along A-A', referring to fig. 14, in some alternative embodiments, the backlight module further includes two light shielding layers 70, and the two light shielding layers 70 are disposed on two sides of the backlight module along a direction perpendicular to a plane of the backlight module, respectively, where the light shielding layers 70 are located at the border area NA, and the light shielding layers 70 can prevent light leakage in the border area NA of the backlight module.
It should be noted that, in fig. 14, the light emitting area FA located on the first light emitting surface S1 of the backlight module and the light emitting area FA located on the second light emitting surface S2 of the backlight module are shown to be coincident, and at this time, the openings of the two light shielding layers 70 are coincident, in other embodiments of the present invention, the openings of the two light shielding layers 70 may also be set to be different, and specifically, the positions may be respectively performed according to the area and the setting position of the light emitting area located on the first light emitting surface of the backlight module and the area and the setting position of the light emitting area located on the second light emitting surface of the backlight module, which are not repeated herein.
Fig. 15 is a schematic plan view of a display device according to the present invention, and fig. 16 is a cross-sectional view of the display device shown in fig. 15 along D-D', please refer to fig. 15 and 16, in which the display device 1000 according to the present embodiment is a dual-sided display device. The display device comprises a backlight module 100 and two display panels 200, wherein the two display panels 200 are respectively arranged at two sides of the backlight module 100 along the direction perpendicular to the plane of the backlight module 100; the backlight module 100 is a display module provided in the above embodiment of the invention.
It should be noted that, in the embodiment of fig. 15, the display device 1000 is described only by taking a mobile phone as an example, and it is to be understood that the display device 1000 provided in the embodiment of the present invention may be any other display device 1000 having a display function, such as a computer, a television, a vehicle-mounted display device, etc., which is not particularly limited in the present invention. The display device 1000 provided in the embodiment of the present invention has the beneficial effects of the display module 100 provided in the embodiment of the present invention, and the specific description of the display module 100 in the above embodiments may be referred to in the embodiments, which is not repeated herein.
According to the embodiment, the backlight module and the display device provided by the invention have the following beneficial effects:
the backlight module provided by the invention is a side-in type backlight module, and the backlight module comprises a light guide plate and a light source assembly. And a lamp groove is arranged on one side of the light guide plate along the first direction, is positioned in the frame area and at least penetrates through part of the light guide plate along the direction perpendicular to the plane where the backlight module is positioned, wherein the first direction is parallel to the plane where the backlight module is positioned. The light source assembly is at least partially embedded in the lamp groove, light emitted by the light source assembly is incident into the light guide plate from the side wall of the lamp groove to be mixed into a surface light source, and is transmitted by the light guide plate and then emitted from the first light emitting surface and the second light emitting surface of the backlight module, and the first light emitting surface and the second light emitting surface are respectively positioned at two sides of the backlight module along the direction perpendicular to the plane of the backlight module, so that the first light emitting surface and the second light emitting surface of the backlight module can be used for providing light sources for the display panel, and double-sided display is realized. Meanwhile, the light source component is at least partially embedded in the lamp groove, so that the light source component can be protected, the risk of damage to the light source component caused by external force is reduced, and the service life is prolonged.
In the backlight module provided by the invention, the light source component, the first optical film and the second optical film are borne by the light guide plate, so that a rubber frame structure and/or an iron frame structure is not required to be arranged in the backlight module for bearing one or more of the light source component, the first optical film and the second optical film, the backlight module is simple in structure, the process is effectively reduced, and the production cost is reduced; and is favorable for realizing the light and thin design of the backlight module.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A backlight module, comprising: a light emitting region and a bezel region surrounding the light emitting region;
the light guide plate is provided with a lamp groove at one side along a first direction, the lamp groove is positioned in the frame area, and at least part of the lamp groove penetrates through the light guide plate along a direction perpendicular to a plane where the backlight module is positioned, wherein the first direction is parallel to the plane where the backlight module is positioned;
the light source assembly is at least partially embedded in the lamp groove;
the first optical film and the second optical film are respectively positioned at two sides of the light guide plate along the direction perpendicular to the plane of the backlight module;
the light source assembly comprises a light source and a circuit board, the light source is electrically connected with the circuit board, and the light source is embedded in the lamp groove;
the vertical projection of the light emitting area on the plane of the backlight module is positioned in the vertical projection of the first optical film on the plane of the backlight module, and the vertical projection of the light emitting area on the plane of the backlight module is positioned in the vertical projection of the second optical film on the plane of the backlight module;
a first diaphragm groove is formed in one side, close to the first optical diaphragm, of the light guide plate along the direction perpendicular to the plane where the backlight module is located, the first diaphragm groove does not penetrate through the light guide plate, and the first optical diaphragm is embedded in the first diaphragm groove;
along the direction perpendicular to the plane where the backlight module is located, one side of the light guide plate, which is close to the second optical film, is provided with a second film groove, the second film groove does not penetrate through the light guide plate, and the second optical film is embedded in the second film groove.
2. A backlight module according to claim 1, wherein,
along the direction perpendicular to the plane of the backlight module, the depth of the first film groove is the same as the thickness of the first optical film, and the depth of the second film groove is the same as the thickness of the second optical film.
3. A backlight module according to claim 1, wherein,
the lamp groove and the first diaphragm groove are positioned on the same side of the light guide plate, and the lamp groove is positioned on one side of the first diaphragm groove facing the second diaphragm groove;
the circuit board is positioned in the first diaphragm groove.
4. A backlight module according to claim 1, wherein,
a plurality of grooves are formed in the surface of at least one side of the light guide plate along the direction perpendicular to the plane of the backlight module;
the groove is positioned in the first diaphragm groove or/and the second diaphragm groove.
5. A backlight module according to claim 4, wherein,
the grooves on the same side of the light guide plate are uniformly distributed.
6. A backlight module according to claim 1, wherein,
a plurality of net points are arranged on the surface of at least one side of the light guide plate along the direction perpendicular to the plane of the backlight module;
the mesh points are positioned in the first diaphragm groove or/and the second diaphragm groove.
7. A backlight module according to claim 6, wherein,
the unit density of the lattice points positioned on the same side of the light guide plate is gradually increased along the first direction and towards the direction away from the light source component.
8. A backlight module according to claim 6, wherein,
the light guide plate comprises a central area and an edge area at least partially surrounding the central area, and the central area and the edge area are internally provided with the mesh points;
in the mesh points positioned on the same side of the light guide plate, the unit density of the mesh points of the edge area is smaller than that of the mesh points of the central area.
9. A backlight module according to claim 6, wherein,
the first diaphragm groove comprises a net point setting part and a net point-free part which is arranged around the net point setting part, and/or the second diaphragm groove comprises a net point setting part and a net point-free part which is arranged around the net point setting part;
the mesh point is arranged in the mesh point setting part, and the mesh point is not arranged in the mesh point-free part;
the non-dot part comprises a first sub-part and a second sub-part, the first sub-part is positioned on one side of the light guide plate far away from the light source assembly along the first direction, and the second sub-part is positioned on one side of the light guide plate along the second direction, wherein the first direction is intersected with the second direction;
along the first direction, the width of the first sub-part is d1, wherein d1 is more than or equal to 0.5mm and less than or equal to 1mm;
and along the second direction, the width of the second sub-part is d2, wherein d2 is more than or equal to 0.5mm and less than or equal to 1mm.
10. A backlight module according to claim 1, wherein,
the backlight module further comprises two shading layers which are respectively arranged at two sides of the backlight module along the direction perpendicular to the plane of the backlight module;
the shading layer is located in the frame area.
11. A backlight module according to claim 1, wherein,
the first optical film comprises a first diffusion sheet, a first brightness enhancement sheet and a second brightness enhancement sheet, the first brightness enhancement sheet is positioned at one side of the first diffusion sheet far away from the light guide plate along the direction perpendicular to the plane where the backlight module is positioned, and the second brightness enhancement sheet is positioned at one side of the first brightness enhancement sheet far away from the light guide plate;
the second optical film comprises a second diffusion sheet, a third brightening sheet and a fourth brightening sheet which are sequentially arranged, the third brightening sheet is located at one side, away from the light guide plate, of the second diffusion sheet along the direction perpendicular to the plane where the backlight module is located, and the fourth brightening sheet is located at one side, away from the light guide plate, of the third brightening sheet.
12. The display device is characterized by comprising a backlight module and two display panels, wherein the two display panels are respectively arranged at two sides of the backlight module along the direction perpendicular to the plane of the backlight module;
wherein the backlight module is the backlight module according to any one of claims 1 to 11.
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| WO2007055059A1 (en) * | 2005-11-08 | 2007-05-18 | Sharp Kabushiki Kaisha | Lamp holder, and backlight device and liquid crystal display device using such lamp holder |
| CN101021651A (en) * | 2007-02-25 | 2007-08-22 | 友达光电股份有限公司 | Light source device with concentrating effect and backlight module using the light source device |
| CN105650542A (en) * | 2016-01-04 | 2016-06-08 | 京东方光科技有限公司 | Backlight module and display device |
| CN110967867A (en) * | 2019-11-20 | 2020-04-07 | 厦门天马微电子有限公司 | Backlight module and display device |
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| TWI421586B (en) * | 2009-01-06 | 2014-01-01 | Au Optronics Corp | Backlight module and double-sided liquid crystal display device |
| CN110361808B (en) * | 2019-07-19 | 2021-03-23 | 京东方科技集团股份有限公司 | Light guide plate and manufacturing method thereof, backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007055059A1 (en) * | 2005-11-08 | 2007-05-18 | Sharp Kabushiki Kaisha | Lamp holder, and backlight device and liquid crystal display device using such lamp holder |
| CN101021651A (en) * | 2007-02-25 | 2007-08-22 | 友达光电股份有限公司 | Light source device with concentrating effect and backlight module using the light source device |
| CN105650542A (en) * | 2016-01-04 | 2016-06-08 | 京东方光科技有限公司 | Backlight module and display device |
| CN110967867A (en) * | 2019-11-20 | 2020-04-07 | 厦门天马微电子有限公司 | Backlight module and display device |
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