CN113687539B - Backlight module and display terminal - Google Patents
Backlight module and display terminal Download PDFInfo
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- CN113687539B CN113687539B CN202110938083.9A CN202110938083A CN113687539B CN 113687539 B CN113687539 B CN 113687539B CN 202110938083 A CN202110938083 A CN 202110938083A CN 113687539 B CN113687539 B CN 113687539B
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- light guide
- light
- guide plate
- backlight
- backlight module
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- 239000012788 optical film Substances 0.000 claims description 18
- 238000005452 bending Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 description 10
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 238000009792 diffusion process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000012780 transparent material Substances 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000013307 optical fiber Substances 0.000 description 2
- 235000009537 plain noodles Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, 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
- G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application provides a backlight module and a display terminal; the backlight module comprises a backlight source and a light guide component, the light guide component comprises a light guide plate and a light guide member, the backlight source is positioned at one side of the light guide plate far away from the light emitting surface, the light guide member is positioned at the light emitting side of the backlight source, the light guide plate is positioned at the light emitting side of the light guide member, the emergent light of the backlight source enters the light guide plate through the light guide member, and in the overlooking direction of the backlight module, the orthographic projection of the backlight source and the orthographic projection of the light guide member or/and the light guide plate are at least partially overlapped; according to the backlight module, the backlight source is arranged on one side of the light-emitting surface of the light guide plate, and the emergent light of the backlight source is led into the light guide plate by the aid of the light guide piece, so that the space occupied by the backlight source at the frame position of the backlight module is reduced, and the technical problem that the frame width of the display screen is difficult to further reduce in the current stage is solved.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display terminal.
Background
At present, the development trend in the display field is narrow-frame and comprehensive screen, which requires that each module frame of the display screen be narrower and narrower. However, due to the existence of the backlight source in the backlight module of the display screen, especially in the side-in backlight module, the arrangement of the backlight source needs to occupy a larger frame space, so that the frame width of the backlight module is difficult to further reduce, and further the frame width of the display screen cannot be further reduced, and the development of the extremely narrow frame display screen or the comprehensive screen is limited.
Therefore, how to further reduce the frame width of the display screen in the narrow-frame display screen of the present stage is a problem to be solved.
Disclosure of Invention
The application provides a backlight module and a display terminal to improve the technical problem that the frame width of the current display screen can not be further reduced.
In order to solve the technical problems, the technical scheme provided by the application is as follows:
the application provides a backlight module, which comprises a backlight source and a light guide assembly, wherein the light guide assembly comprises a light guide plate and a light guide piece, the backlight source is positioned at one side of the light guide plate far away from a light emitting surface, the light guide piece is positioned at the light emitting side of the backlight source, the light guide plate is positioned at the light emitting side of the light guide piece, and the emergent light of the backlight source enters the light guide plate through the light guide piece;
wherein, in the overlook direction of the backlight module, the orthographic projection of the backlight source is at least partially overlapped with the orthographic projection of the light guide piece or/and the light guide plate;
the backlight module further comprises a back frame, the back frame is arranged on one side, far away from the light emitting surface, of the light guide plate, a first notch is formed in one side, facing the light guide plate, of the light guide piece, and the back frame extends into the first notch;
the light guide piece is provided with a fixing piece in the first notch, and the light guide piece is fixed with the back frame through the fixing piece;
the back frame comprises a main body part and a bending part, wherein the main body part is positioned at one side of the light guide plate far away from the light-emitting surface, the first end of the bending part is connected with the main body part, and the second end of the bending part is bent towards one side of the light-emitting surface of the light guide plate;
the main body part is provided with a second notch, and the light guide piece passes through the second notch;
the width of the light guide piece at the position of the maximum bending depth is smaller than the width of the light guide piece at other positions.
In the backlight module, the light guide member comprises a light guide tube, wherein a first end of the light guide tube is connected with a light emitting side of the backlight source, and a second end of the light guide tube is connected with a light entering side of the light guide plate;
the backlight module comprises a light guide tube, a backlight source and a light guide plate, wherein the light guide tube is internally provided with a light guide channel, and emergent light rays of the backlight source enter the light guide plate through the light guide channel.
In the backlight module, the light guide cylinder is close to the inner side surface of the light guide channel and is provided with a first reflecting layer.
In the backlight module, the light emitting side of the backlight source is embedded into the first end of the light guide cylinder, and the light entering side of the light guide plate is embedded into the second end of the light guide cylinder;
the first end of the light guide cylinder is tightly attached to the light emitting side of the backlight source, and the second end of the light guide cylinder is tightly attached to the light entering side of the light guide plate.
In the backlight module, the light guide piece comprises a light guide block, a first end of the light guide block is connected with the light guide plate, a second end of the light guide block is bent to a side far away from the light emitting surface of the light guide plate, and the second end of the light guide block is connected with the light emitting side of the backlight source;
the emergent light of the backlight source passes through the light guide block and enters the light guide plate.
In the backlight module, the surface of the light guide block is provided with a second reflecting layer, and the second reflecting layer is positioned on the side surface of the light guide block except the first end and the second end. In the backlight module, the backlight module further comprises an optical film layer arranged on the light emitting surface of the light guide plate, and a cushion layer is arranged on the light guide piece;
the thickness of the cushion layer is the same as that of the optical film layer in the direction perpendicular to the light-emitting surface of the light guide plate.
The application also provides a display terminal, which comprises a terminal main body and the backlight module, wherein the backlight module and the terminal main body are combined into a whole.
The beneficial effects are that: this application is through keeping away from the one side of play plain noodles with the backlight setting at the light guide plate to with the outgoing light of backlight in leading-in to the light guide plate with the help of the light guide piece, reduce the space that the backlight occupy in backlight unit's frame position, realize the effect of narrow frame, owing to the existence of light guide piece, increased the distance between the income plain noodles of backlight and light guide plate moreover, make the light mixed light that the backlight sent more abundant, thereby can reduce luminance and colour difference, the uneven phenomenon of bright and dark that appears when effectively improving the demonstration.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a backlight module according to the present application;
fig. 2 is a schematic diagram of a second structure of the backlight module according to the present application;
fig. 3 is a schematic diagram of a third structure of the backlight module according to the present application;
FIG. 4 is a schematic view of a first structure of a light guide tube according to the present disclosure;
FIG. 5 is a schematic view of a light guide block according to the present application;
fig. 6 is a schematic diagram of a fourth structure of the backlight module according to the present application;
FIG. 7 is a schematic plan view of a back frame according to the present application;
FIG. 8 is a schematic view of a second construction of a light guide barrel according to the present application;
fig. 9 is a schematic structural view of an optical film layer described in the present application.
Reference numerals illustrate:
the backlight 100, the light guide plate 200, the light emitting surface 210, the reflective surface 220, the third reflective layer 230, the light guide 300, the light guide tube 310, the light guide channel 311, the first reflective layer 312, the light guide block 320, the second reflective layer 321, the first notch 330, the fixing member 340, the back frame 400, the main body portion 410, the second notch 411, the bent portion 420, the vertical portion 421, the horizontal portion 422, the optical film layer 500, the lower diffusion sheet 510, the prism sheet 520, the upper diffusion sheet 530, and the spacer 600.
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 those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
With the development of liquid crystal display technology, users are required to have more functions and fashionable appearances for electronic products such as mobile phones, tablet computers, cameras and the like. Currently, the development trend of electronic products is a comprehensive screen, and for a Liquid Crystal Display (LCD), the frame of a display panel in a module is narrower and narrower, wherein the width of the frame at the unbound region side is within 1mm, and the width of the frame at the bound region side is within 3 mm.
Among them, the frame width of the LCD is affected, and another important factor other than the frame width of the display panel is the frame width of the backlight module. In the side-in backlight module, the backlight source is generally disposed at the frame of the module, and if the frame of the module on the backlight source side is narrowed, a light emitting effect (hotspot) on the side of the lamp socket, which is a phenomenon that light and shade are alternately arranged at the picture light entering position close to the frame of the display device, is easily generated by the backlight source, so that the abnormal display problem of uneven display is caused. Therefore, how to further reduce the module frame on the backlight side is a problem to be solved. The present application proposes the following scheme based on the above technical problems.
Referring to fig. 1 to 9, the present application provides a backlight module, which includes a backlight source 100 and a light guide assembly, wherein the light guide assembly includes a light guide plate 200 and a light guide 300. The light guide plate 200 includes a light emitting surface 210 and a reflecting surface 220, the light emitting surface 210 and the reflecting surface 220 are parallel and oppositely disposed, and the light emitted from the backlight 100 is emitted from the light emitting surface 210 to the display panel.
In this embodiment, the backlight 100 is located at a side of the light guide plate 200 away from the light emitting surface 210 and near an edge position of the light guide plate 200, that is, the backlight 100 is located at a side of the reflecting surface 220 of the light guide plate 200. The light guide 300 is located at the light emitting side of the backlight 100, the light guide plate 200 is located at the light emitting side of the light guide 300, and the light emitted from the backlight 100 enters the light guide plate 200 through the light guide 300.
In this embodiment, the light emitted from the backlight 100 enters the light guide 300 along the first direction A1, passes through the light guide 300, enters the light guide plate 200 along the second direction A2, and exits from the light emitting surface 210 of the light guide plate 200 along the third direction A3. The first direction A1 is a horizontal direction from the light guide plate 200 to the light guide member 300, and the second direction A2 is opposite to the first direction A1, i.e. the second direction A2 is a horizontal direction from the light guide member 300 to the light guide plate 200. The third direction A3 is a vertical direction perpendicular to the first direction A1 and the second direction A2, and is directed to the light-emitting surface 210 by the reflecting surface 220.
According to the embodiment of the application, the backlight source 100 is arranged on one side of the light guide plate 200 away from the light emitting surface 210, and the emitted light of the backlight source 100 is guided into the light guide plate 200 by the light guide member 300, so that the space occupied by the backlight source 100 at the frame position of the backlight module is reduced, and the effect of a narrow frame is realized. In addition, due to the light guide 300, the distance between the backlight source 100 and the light incident surface of the light guide plate 200 is increased, so that light emitted by the backlight source 100 is mixed more fully, brightness and color difference can be reduced, and Hotspot Mura (uneven brightness) phenomenon during display can be effectively improved.
In this embodiment, in the top view direction of the backlight module, the front projection of the backlight source 100 and the front projection of the light guide 300 or/and the light guide plate 200 at least partially overlap, so that the projection range of the backlight source 100 on the top view of the backlight module does not exceed the projection range of the light guide plate 200 and the light guide 300, thereby reducing the frame space occupied by the backlight source 100 and the light guide 300 as much as possible and realizing the effect of ultra-narrow frame. For example, as shown in fig. 1, in the top view of the backlight module, the front projection of the backlight 100 is located within the front projection range of the light guide 300, that is, for the backlight 100, the front projection of the backlight 100 and the front projection of the light guide 300 all overlap. Alternatively, as shown in fig. 2, in a top view of the backlight module, the front projection of the backlight 100 is located within the front projection range of the light guide plate 200. Alternatively, as shown in fig. 3, in the top view of the backlight module, the backlight 100 spans the connection position between the light guide 300 and the light guide plate 200, that is, a part of the front projection of the backlight 100 falls within the front projection of the light guide 300, and the other part falls within the front projection of the light guide plate 200.
It should be noted that, the specific position of the backlight 100 on the reflecting surface 220 side of the light guide plate 200 is related to the size specification of the backlight module, that is, the overlapping relationship between the backlight 100 and the light guide 300, and the orthographic projection of the light guide plate 200 in the top view direction of the backlight module depends on the size specification of the backlight module, which is not particularly limited in the embodiments of the present application.
The technical solutions of the present application will now be described with reference to specific embodiments. The following description of the embodiments is not intended to limit the preferred embodiments.
In the backlight module of the present application, referring to fig. 4, the light guide 300 includes a light guide tube 310, a first end of the light guide tube 310 is connected to the light emitting side of the backlight 100, a second end of the light guide tube 310 is connected to the light incident side of the light guide plate 200, a light guide channel 311 is disposed in the light guide tube 310, and the outgoing light of the backlight 100 enters the light guide plate 200 through the light guide channel 311.
In this embodiment, the light guide tube 310 may be made of a hard or flexible non-transparent material, so long as the light guiding effect is achieved.
According to the embodiment of the application, the light guide barrel 310 is arranged, outgoing light of the backlight source 100 is led into the light guide plate 200 by means of the light guide channel 311 in the light guide barrel 310, so that the situation that the backlight source 100 is arranged on the side edge of the light guide plate 200 to occupy a large frame space is avoided, the frame width of a backlight module is reduced, and on the other hand, the light guide barrel 310 can also achieve a light receiving effect on the outgoing light of the backlight source 100, and backlight light leakage is reduced.
In the backlight module of the present application, a first reflective layer 312 is disposed on an inner side of the light guide tube 310 adjacent to the light guide channel 311. In this embodiment, the light guide tube 310 is a hollow casing structure with two ends penetrating, wherein the inner side surface of the casing is the cavity wall surface of the light guide channel 311.
In this embodiment, the first reflective layer 312 may be a metal plating layer or a multi-layered bubble film or other film structure that can perform a total reflection function.
In this embodiment, the light guiding tube 310 may be made of a flexible non-transparent material, such as a thin film material or an optical fiber material, where the light guiding tube 310 is coated or evaporated with a reflective coating on the surface of the thin film by the first reflective layer 312, and then is curled to form.
In this embodiment, the light guide tube 310 may be made of a rigid transparent or non-transparent material, such as glass, plastic, etc., and the first reflective layer 312 is a reflective coating coated on the inner side of the glass that has been shaped into a tube.
According to the embodiment of the application, the first reflecting layer 312 is arranged on the inner side surface of the light guide tube 310, so that the emergent light of the backlight source 100 can be efficiently reflected and mixed by means of the first reflecting layer 312 after entering the light guide tube 310, the light loss rate is reduced, and the phenomenon of Hotspot Mura (uneven brightness) is effectively improved.
In the backlight module of the present application, the light emitting side of the backlight source 100 is embedded inside the first end of the light guide tube 310, and the light entering side of the light guide plate 200 is embedded inside the second end of the light guide tube 310, so as to reduce the light leakage phenomenon at the joints between the backlight source 100 and the light guide tube 310 and between the light guide tube 310 and the light guide plate 200, and simultaneously, also facilitate improving the stability of the connection structure among the backlight source 100, the light guide tube 310 and the light guide plate 200.
In this embodiment, the shape and area of the first end of the light guide tube 310 are the same as the shape and area of the light emitting side of the backlight 100. The second end of the light guide tube 310 has the same shape and area as the light incident side of the light guide plate 200. Thereby, the inner sidewall of the light guiding tube 310 is tightly attached to the light emitting side of the backlight source 100 and the light entering side of the light guiding plate 200, so as to further reduce the light leakage phenomenon at the joint of the backlight source 100, the light guiding tube 310 and the light guiding plate 200, and improve the display effect.
In the backlight module of the present application, referring to fig. 5, the light guide 300 includes a light guide block 320, a first end of the light guide block 320 is connected to the light guide plate 200, a second end of the light guide block 320 is bent to a side away from the light emitting surface 210 of the light guide plate 200, and a second end of the light guide block 320 is connected to the light emitting side of the backlight 100. The outgoing light of the backlight source 100 passes through the light guide block 320 and enters the light guide plate 200.
In this embodiment, the light guide block 320 may be a solid block structure made of a transparent material, such as glass or an optical fiber material, so that the outgoing light of the backlight 100 can be conducted through the solid light guide block 320.
In this embodiment, the first end of the light guide block 320 has the same shape and area as the side surface of the light incident side of the light guide plate 200, the second end of the light guide block 320 has the same shape and area as the side surface of the light emergent side of the backlight 100, and the light guide block 320 is closely attached to the backlight 100 and the light guide plate 200, so as to further reduce the light leakage phenomenon.
In this embodiment, the light guide block 320 may be integrally formed with the light guide plate 200, so as to avoid a contact surface between the light guide block 320 and the light guide plate 200, and reduce an increase in light loss rate due to the presence of the contact surface.
In the backlight module of the present application, the surface of the light guiding block 320 is provided with a second reflective layer 321, and the second reflective layer 321 is located on a side surface of the light guiding block 320 except the first end and the second end. In this embodiment, the second reflective layer 321 may have a metal reflective layer with high reflectivity, such as a metal material of Al, ag, or the like.
In this embodiment, the second reflective layer 321 is disposed on the surface of the light guide block 320, so that light emitted from the inside of the light guide block 320 is reflected back into the inside of the light guide block 320, thereby reducing the light leakage phenomenon of the backlight 100 at the light guide block 320, improving the display brightness, and improving the display effect.
In the display back plate of the present application, referring to fig. 1 to 3, the backlight module further includes a back frame 400, and the back frame 400 is disposed at a side of the light guide plate 200 away from the light emitting surface 210. The back frame 400 includes a planar metal plate that provides a mounting base for the light guide plate 200, a third reflective layer 230 is disposed on the reflective surface 220 of the light guide plate 200, and the third reflective layer 230 is attached to a side surface of the back frame 400 facing the light guide plate 200.
In this embodiment, the third reflective layer 230 may be a metal reflective sheet with high light reflectivity, such as Al, ag metal sheet, and the like.
In this embodiment, a side of the light guide 300 facing the light guide plate 200 is provided with a first notch 330, and the back frame 400 extends into the first notch 330. The first notch 330 is a middle notch formed by bending the light guide 300 from the backlight source 100 to the light guide plate 200, in other words, the light guide 300 forms a U-shaped structure when bending from the backlight source 100 to the light guide plate 200, and the first notch 330 is an opening of the U-shaped structure. In this embodiment, the back frame 400 is extended into the first notch 330, so that the first notch 330 can perform a good positioning and limiting function on the back frame 400, and the bonding stability between the back frame 400 and the light guide plate 200 is improved.
In this embodiment, the light guide 300 is provided with a fixing member 340 in the first slot 330, and the light guide 300 is fixed to the back frame 400 by the fixing member 340. The fixing member 340 may include a double-sided tape, a first side of which is adhered to a wall of the first slot 330, and a second side of which is adhered to a side of the back frame 400 facing the light guide plate 200. In this embodiment, the light guide 300 is fixed to the back frame 400 by the double-sided film, so that the light guide 300 is not easy to be misplaced between the back frame 400 and the light guide plate 200, thereby forming a good integral structure, and the light guide effect is more stable.
In the backlight module of the present application, referring to fig. 6, the back frame 400 includes a main body portion 410 and a bending portion 420, the main body portion 410 is located at a side of the light guide plate 200 away from the light-emitting surface 210, a first end of the bending portion 420 is connected to the main body portion 410, and a second end of the bending portion 420 is bent toward the light-emitting surface 210 side of the light guide plate 200.
In this embodiment, the main body 410 is a planar metal plate, and the bending portion 420 is a bent metal plate integrally formed with the main body 410. The main body 410 is fixedly attached to the reflecting surface 220 of the light guide plate 200, the bent metal plate includes a vertical portion 421 perpendicular to the main body 410 and a horizontal portion 422 perpendicular to the vertical portion 421, and the horizontal portion 422 extends horizontally from the vertical portion 421 to the light guide plate 200. The horizontal portion 422 is located at the light-emitting surface 210 side of the light guide plate 200, and the extending width of the horizontal portion 422 toward the light guide plate 200 side does not exceed the connection position of the light guide 300 and the light guide plate 200, so as to further reduce the frame width of the back frame 400.
In this embodiment, referring to fig. 7, the main body 410 is provided with a second slot 411, the second slot 411 is in a strip shape, and the light guide 300 is horizontally inserted into the second slot 411, so that the first end and the second end of the light guide 300 can be respectively located at two different sides of the back frame 400. The position of the maximum bending depth of the light guide 300 is embedded in the second slot 411, so that the back frame 400 further performs position limitation on the light guide 300, and improves the position stability of the light guide 300.
In this embodiment, referring to fig. 8, the width of the light guide 300 at the position of the maximum bending depth may be smaller than the width of other portions, where the width is along the extending direction of the splicing line of the light guide 300 and the light guide plate 200. In this embodiment, the light guide 300 is taken as an example of the light guide barrel 310, as shown in fig. 8, it should be noted that, in this embodiment, the structure is similar to that of fig. 8, and the description is omitted here.
Correspondingly, in the extending direction of the splice line between the light guide 300 and the light guide plate 200, the length of the second notch 411 is equal to the width of the light guide 300 at the position of the maximum bending depth. That is, in the extending direction of the splicing line between the light guide 300 and the light guide plate 200, the length of the second slot 411 is smaller than the length of the main body 410, so as to reduce the opening length ratio of the second slot 411 on the main body 410, and maintain the structural strength and stability of the main body 410.
In the backlight module of the present application, referring to fig. 6 and 9, fig. 9 is a schematic structural diagram of an optical film 500, the backlight module further includes the optical film 500 disposed on the light-emitting surface 210 of the light guide plate 200, and the optical film 500 includes a lower diffusion sheet 510 disposed on the light-emitting surface 210 of the light guide plate 200, a prism sheet 520 disposed on a side of the lower diffusion sheet 510 away from the light guide plate 200, and an upper diffusion sheet 530 disposed on a side of the prism sheet 520 away from the lower diffusion sheet 510.
In this embodiment, the horizontal portion 422 of the back frame 400 extends horizontally from the vertical portion 421 to the light guide plate 200, the extending width d1 of the horizontal portion 422 is 0.35mm, the distance d2 between the horizontal portion 422 and the optical film layer 500 is 0.2mm, and the distance d3 between the edge of the optical film layer 500, which is close to the horizontal portion 422, and the visible area of the display screen is 0.8mm, so that the frame width d4 of the backlight module may be 1.35mm and less than the frame width 1.6mm of the display panel at the present stage, and thus the frame of the display screen may be further narrowed, and a full-face screen is realized.
In this embodiment, a spacer 600 is disposed on the surface of the light guide 300 flush with the light-emitting surface 210 of the light guide plate 200. In the direction perpendicular to the light emitting surface 210 of the light guide plate 200, the thickness of the spacer 600 is the same as the thickness of the optical film 500, so that the surfaces of the light guide 300 and the optical film 500 are flat, and a light shielding adhesive tape is conveniently arranged on the flat surface to fix the backlight module and the display panel in a combined manner.
In the backlight module of the present application, referring to fig. 6, the orthographic projection of the connection position of the light emitting side of the light guide 300 and the light guide plate 200 on the optical film 500 is located in the optical film 500, so that the optical film 500 protects the connection position of the light guide 300 and the light guide plate 200, and the connection position of the light guide 300 and the light guide plate 200 is not easy to loosen.
In this embodiment, the side surface of the optical film 500, which is close to the light guide plate 200, is adhered to the surface of the light guide 300, so that the optical film 500, the light guide 300, and the light guide plate 200 are integrally connected, and the overall structural stability is further improved.
The embodiment of the application also provides a display terminal, which comprises a terminal main body and the backlight module, wherein the backlight module and the terminal main body are combined into a whole. In this embodiment, the display panel may be TN-LCD, STN-LCD, HTN-LCD, FSTN-LCD, TFT-LCD, etc.
The embodiment of the application provides a backlight module and a display terminal, wherein the backlight module is arranged on one side of a light guide plate 200 away from a light emitting surface 210, and the emitted light of the backlight 100 is led into the light guide plate 200 by a light guide 300, so that the space occupied by the backlight 100 at the frame position of the backlight module is reduced, and the effect of a narrow frame is realized. In addition, due to the light guide 300, the distance between the backlight source 100 and the light incident surface of the light guide plate 200 is increased, so that the light emitted by the backlight source 100 is mixed more fully, the brightness and color difference can be reduced, and the phenomenon of uneven brightness and darkness during display can be effectively improved.
The above describes a backlight module and a display terminal provided in the embodiments of the present application in detail, and specific examples are applied to describe the principles and embodiments of the present application, where the description of the above embodiments is only for helping to understand the method and core ideas of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. The backlight module is characterized by comprising a backlight source and a light guide assembly, wherein the light guide assembly comprises a light guide plate and a light guide piece, the backlight source is positioned at one side of the light guide plate far away from the light emitting surface, the light guide piece is positioned at the light emitting side of the backlight source, the light guide plate is positioned at the light emitting side of the light guide piece, and the emergent light of the backlight source enters the light guide plate through the light guide piece;
wherein, in the overlook direction of the backlight module, the orthographic projection of the backlight source is at least partially overlapped with the orthographic projection of the light guide piece or/and the light guide plate;
the backlight module further comprises a back frame, the back frame is arranged on one side, far away from the light emitting surface, of the light guide plate, a first notch is formed in one side, facing the light guide plate, of the light guide piece, and the back frame extends into the first notch;
the light guide piece is provided with a fixing piece in the first notch, and the light guide piece is fixed with the back frame through the fixing piece;
the back frame comprises a main body part and a bending part, wherein the main body part is positioned at one side of the light guide plate far away from the light-emitting surface, the first end of the bending part is connected with the main body part, and the second end of the bending part is bent towards one side of the light-emitting surface of the light guide plate;
the main body part is provided with a second notch, and the light guide piece passes through the second notch;
the width of the light guide piece at the position of the maximum bending depth is smaller than the width of the light guide piece at other positions.
2. The backlight module according to claim 1, wherein the light guide member comprises a light guide tube, a first end of the light guide tube is connected with the light emitting side of the backlight source, and a second end of the light guide tube is connected with the light entering side of the light guide plate;
the backlight module comprises a light guide tube, a backlight source and a light guide plate, wherein the light guide tube is internally provided with a light guide channel, and emergent light rays of the backlight source enter the light guide plate through the light guide channel.
3. A backlight module according to claim 2, wherein the light guide tube is provided with a first reflective layer on an inner side surface thereof adjacent to the light guide channel.
4. A backlight module according to claim 3, wherein the light-emitting side of the backlight is embedded inside the first end of the light guide tube, and the light-entering side of the light guide plate is embedded inside the second end of the light guide tube;
the first end of the light guide cylinder is tightly attached to the light emitting side of the backlight source, and the second end of the light guide cylinder is tightly attached to the light entering side of the light guide plate.
5. The backlight module according to claim 1, wherein the light guide member comprises a light guide block, a first end of the light guide block is connected with the light guide plate, a second end of the light guide block is bent to a side far away from the light emitting surface of the light guide plate, and the second end of the light guide block is connected with the light emitting side of the backlight source;
the emergent light of the backlight source passes through the light guide block and enters the light guide plate.
6. A backlight module according to claim 5, wherein the surface of the light guide block is provided with a second reflective layer, the second reflective layer being located on a side of the light guide block other than the first and second ends.
7. The backlight module according to claim 1, further comprising an optical film layer disposed on the light-emitting surface of the light guide plate, wherein a cushion layer is disposed on the light guide member;
the thickness of the cushion layer is the same as that of the optical film layer in the direction perpendicular to the light-emitting surface of the light guide plate.
8. A display terminal comprising a terminal body and a backlight module according to any one of claims 1 to 7, the backlight module and the terminal body being integrally combined.
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