CN110764309B - Backlight module, display screen and terminal - Google Patents

Backlight module, display screen and terminal Download PDF

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Publication number
CN110764309B
CN110764309B CN201911049807.3A CN201911049807A CN110764309B CN 110764309 B CN110764309 B CN 110764309B CN 201911049807 A CN201911049807 A CN 201911049807A CN 110764309 B CN110764309 B CN 110764309B
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CN
China
Prior art keywords
backlight module
light
guide plate
light guide
hole
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Active
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CN201911049807.3A
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Chinese (zh)
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CN110764309A (en
Inventor
姜必武
古远琴
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Shenzhen Techaser Technologies Co Ltd
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Shenzhen Techaser Technologies Co Ltd
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Priority to CN201911049807.3A priority Critical patent/CN110764309B/en
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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
    • 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
    • G02B6/0065—Manufacturing aspects; Material 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02B6/0075—Arrangements of multiple light guides
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Abstract

The embodiment of the invention provides a backlight module, a display screen and a terminal. Meanwhile, the light-emitting part of the auxiliary light guide plate extends into the through hole, the top of the light-emitting part is flush, and the side wall of the light-emitting part is attached to the inner wall of the through hole, so that the light-emitting surface of the auxiliary light guide plate covers the through hole, light emitted by the auxiliary LED light source can be emitted out from the light-emitting part, and all areas on the upper surface of the through hole are lightened, so that the areas corresponding to the cameras arranged under the screen in the backlight module can be lightened completely. The backlight module and the display screen provided by the embodiment of the invention improve the screen occupation ratio of the terminal, so that the full-screen is realized on the basis of the camera under the screen, and the improvement of the experience of a terminal user is facilitated.

Description

Backlight module, display screen and terminal
Technical Field
The invention relates to the field of display, in particular to a backlight module, a display screen and a terminal.
Background
In the process of continuously pursuing large screen ratio of the terminal, people put forward the concept of 'full screen'. The full screen means that no special space is available on the front face of the terminal for arranging devices such as a front camera, a receiver and the like. Therefore, "camera under screen" arises by oneself, so-called camera under screen just means that leading camera sets up under the screen, but, although the camera can hide under the screen, this also can lead to setting up the regional unable quilt that the camera corresponds on the display screen and being lighted and show, consequently just also can't realize real comprehensive screen yet, has seriously influenced user experience.
Disclosure of Invention
The backlight module, the display screen and the terminal provided by the embodiment of the invention mainly solve the technical problems that: the area corresponding to the camera under the screen is set in the display screen and cannot be displayed, so that the occupation ratio of the terminal screen is limited, and the display effect of the terminal is influenced.
In order to solve the above technical problems, an embodiment of the present invention provides a backlight module, which includes a main backlight module and a sub backlight module, wherein the main backlight module includes an outer frame, a protruding portion protruding upward is disposed on a bottom wall of the outer frame, and a through hole penetrating through an upper surface of the protruding portion and a lower surface of the bottom wall is disposed in the protruding portion;
the auxiliary backlight module comprises an auxiliary LED light source and an auxiliary light guide plate, a penetrating camera hole is formed in the position, corresponding to the penetrating hole, of the auxiliary LED light source, and the camera hole and the penetrating hole are jointly used for image acquisition of a lower screen camera positioned below the auxiliary backlight module; the light inlet parts of the auxiliary LED light source and the auxiliary light guide plate are positioned below the bottom wall, the light outlet part of the auxiliary light guide plate extends into the through hole, the upper surface of the light outlet part is flush, and the side wall of the light outlet part is attached to the inner wall of the through hole; light emitted by the auxiliary LED light source enters the light inlet part of the auxiliary light guide plate and then is emitted from the light outlet surface of the light outlet part.
Optionally, the lower surface of the secondary light guide plate is flush.
Optionally, the auxiliary light guide plate is arranged in an injection molding manner, and the outer frame is provided with a glue fixing hole for fixedly connecting the outer frame and the auxiliary light guide plate.
Optionally, the glue fixing hole is located in a region of the bottom wall other than the region where the protruding portion is located.
Optionally, the top of the light-emitting portion and the top of the protrusion are located on the same horizontal line, and a double-sided adhesive tape for fixing the liquid crystal panel is disposed on the top of the light-emitting portion and the top of the protrusion.
Optionally, the double sided tape is white or gray.
Optionally, the width of the coverage area of the double-sided adhesive tape on the light emergent part is d, and d is greater than or equal to 0.25mm and less than or equal to 0.35 mm.
Optionally, d is 0.3 mm.
The embodiment of the invention provides a display screen, which comprises a liquid crystal panel and a backlight module, wherein the liquid crystal panel is arranged on a main backlight module.
The embodiment of the invention provides a terminal which comprises a lower screen camera and the display screen, wherein the lower screen camera is arranged below a camera hole of a secondary backlight module, and image acquisition is carried out through the camera hole and a through hole.
The beneficial effects of the invention are:
the embodiment of the invention provides a backlight module, a display screen and a terminal, wherein the backlight module comprises a main backlight module and an auxiliary backlight module, the main backlight module comprises an outer frame, a raised part which is raised upwards is arranged on the bottom wall of the outer frame, and a through hole which penetrates through the upper surface of the raised part and the lower surface of the bottom wall is arranged in the raised part. The auxiliary backlight module comprises an auxiliary LED light source and an auxiliary light guide plate, a penetrating camera hole is formed in the position, corresponding to the penetrating hole, of the auxiliary LED light source, the camera hole and the penetrating hole are jointly used for an under-screen camera located below the auxiliary backlight module to conduct image acquisition, light incoming portions of the auxiliary LED light source and the auxiliary light guide plate are located in the area outside the penetrating hole below the bottom wall, the top of a light outgoing portion of the auxiliary light guide plate is flush and extends into the penetrating hole, the side wall of the light outgoing portion is attached to the inner wall of the penetrating hole, light emitted by the auxiliary LED light source enters the light incoming portion of the auxiliary light guide plate and then is emitted from the light outgoing face of the light outgoing portion, and all areas of the upper surface of the penetrating hole are lightened. In the embodiment of the invention, the outer frame of the main backlight module is provided with the through hole, and the auxiliary LED light source below the through hole is provided with the camera hole, so that the lower screen camera below the auxiliary backlight module can acquire images through the two holes, and shooting is realized. Meanwhile, the light-emitting part of the auxiliary light guide plate in the auxiliary backlight module extends into the through hole, the top of the light-emitting part is flush, and the side wall of the light-emitting part is attached to the inner wall of the through hole, so that the light-emitting part covers the through hole, after light emitted by the auxiliary LED light source enters the auxiliary light guide plate, the light can be emitted from the light-emitting part in the through hole and illuminate all areas of the upper surface of the through hole, and therefore the area corresponding to the lower screen camera arranged in the backlight module can be illuminated completely, and a foundation is provided for display of the area of the display screen. The backlight module and the display screen provided by the embodiment of the invention improve the screen occupation ratio of the terminal, so that the full-screen is realized on the basis of the camera under the screen, and the improvement of the experience of a terminal user is facilitated.
Additional features and corresponding advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the invention;
fig. 2a is a schematic cross-sectional view of a backlight module provided in an example 2 of the embodiment of the invention;
fig. 2b is another schematic cross-sectional view of a backlight module provided in an example 2 of the embodiment of the invention;
fig. 3a is a schematic cross-sectional view of a backlight module provided in an example 1 of the present invention;
fig. 3b is another schematic cross-sectional view of the backlight module provided in example 1 of the present invention;
fig. 4 is a schematic cross-sectional view of a sub-light guide plate provided in example 2 of the present invention;
fig. 5a is a schematic cross-sectional view of a backlight module provided in an example 3 of an embodiment of the invention;
fig. 5b is another schematic cross-sectional view of the backlight module provided in example 3 of the embodiment of the present invention;
fig. 6 is a schematic cross-sectional view of a sub-light guide plate provided in example 3 according to an embodiment of the present invention;
fig. 7a is a schematic cross-sectional view of a backlight module according to an embodiment 4 of the present invention;
fig. 7b is another schematic cross-sectional view of the backlight module provided in an example 4 of the embodiment of the invention;
fig. 8a is a schematic cross-sectional view of a side-entry sub-backlight module according to a third embodiment of the present invention;
FIG. 8b is a top view of the secondary LED light source of FIG. 8 a;
FIG. 8c is a top view of another secondary LED light source provided in the third embodiment of the present invention;
FIG. 8d is a top view of three other sub-LED light sources provided in the third embodiment of the present invention;
fig. 9a is a schematic cross-sectional view of a sub backlight module according to a third embodiment of the present disclosure;
FIG. 9b is a top view of the secondary LED light source of FIG. 9 a;
fig. 9c is a top view of two other secondary LED light sources provided in the third embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The first embodiment is as follows:
fig. 1 shows a schematic view of an arrangement of an off-screen camera, in fig. 1, a through hole 100 is arranged in a backlight module 10, and the through hole 100 penetrates through an outer frame 101 of the backlight module 10: a protrusion protruding upward is provided on the bottom wall of the outer frame 101, and the through hole 100 penetrates the upper surface of the protrusion and the bottom of the outer frame 101. The outer frame 101 further includes a side wall, the side wall and the bottom wall enclose to form a half-enclosed accommodating chamber, and the accommodating chamber sequentially accommodates the reflective film 102, the light guide plate 103, the diffusion sheet 104 and the brightness enhancement film 105 of the backlight module 10 from bottom to top. In this embodiment, the positions of the reflective film 102, the light guide plate 103, the diffusion sheet 104 and the brightness enhancement film 105 corresponding to the protrusions are all provided with openings, and through the openings, the reflective film 102, the light guide plate 103, the diffusion sheet 104 and the brightness enhancement film 105 can be sequentially sleeved outside the protrusions, so that the reflective film 102 is directly disposed on the bottom wall of the outer frame 101, the light guide plate 103 is disposed on the reflective film 102, and upward naturally and sequentially is the diffusion sheet 104 and the brightness enhancement film 105. The brightness enhancement film 105 may be formed by an upper prism sheet and a lower prism sheet, or a composite film formed by combining the upper prism sheet and the lower prism sheet, or even in some other examples of this embodiment, the brightness enhancement film 105 may be an inverse prism film.
The under-screen camera 12 may be disposed under the outer frame 101 of the backlight module 10, which may perform image capturing through the through-hole 100: external light passes through the through-hole 100 to reach the under-screen camera 12, and forms an image in the under-screen camera 12.
In the backlight module 10, in order to provide a channel for the camera 12 under the screen to allow external light to enter, no light guide plate is disposed in the through hole 100, and the LED light source of the backlight module is not turned on due to the shielding of the protruding portion, so that the position corresponding to the through hole 100 in the display screen prepared based on the backlight module 10 cannot normally display an image. Therefore, in the related art, although the camera of the terminal can be hidden under the display screen, the image acquisition of the camera under the screen can be realized only by sacrificing the display area of the display screen, which severely restricts the user experience of the terminal. To solve the problem, the present embodiment provides a backlight module, please refer to a schematic cross-sectional view of the backlight module shown in fig. 2 a:
among the backlight modules 20a, two backlight modules are a main backlight module 21 and an auxiliary backlight module 22, wherein the structure of the main backlight module 21 can refer to the structure of the backlight module 10 in fig. 1: the main backlight module 21 includes an outer frame 211, and it is understood that the main backlight module 21 may include a reflective film, an LED light source, a light guide plate, and other devices besides the outer frame. In order to distinguish from the LED light sources and the light guide plates in the sub-backlight module 22, in the present embodiment, the LED light sources in the main backlight module 21 are referred to as "main LED light sources", the light guide plates therein are referred to as "main light guide plates", and the LED light sources and the light guide plates in the sub-backlight module 22 are referred to as "sub LED light sources" and "sub light guide plates", respectively.
It is understood that the main LED light source and the sub LED light source are not only LED chips, but also circuit boards electrically connected to the LED chips to control the LED chips, and the circuit boards may be common PCB circuit boards or flexible circuit boards.
The outer frame 211 of the main backlight module 21 may be made of metal, such as iron or other metals, and of course, the outer frame 211 may also be made of alloy. In other examples of the present embodiment, the outer frame 211 may also be made of plastic, and of course, an outer frame formed by combining plastic and metal is also feasible, for example, a plastic-iron integrated frame which is widely used at present. The outer frame 211 includes a bottom wall and a side wall, and the bottom wall has a convex portion protruding upward. The bottom wall and the side wall enclose a receiving cavity in which other devices of the main backlight module 21, such as a main LED light source, a reflective film, a light guide plate, etc., can be disposed, and of course, because of the existence of the protruding portion, the reflective film, the light guide plate, etc. in the main backlight module 21 also need to be provided with an opening as in the backlight module 10.
Through holes 200 penetrating the upper surface of the boss and the lower surface of the bottom wall of the outer frame 211 are provided in the boss, and external light can pass through the upper surface of the main backlight module 21 through the through holes 200 to reach the back surface of the main backlight module 21.
In order to light the corresponding position of the through hole 200 in the backlight module 20a, the sub backlight module 22 is required, in the present embodiment, the sub backlight module 22 includes a sub LED light source 221 and a sub light guide plate 222, in fig. 2a, the sub backlight module 22 is a side-in type backlight module, but in some examples of the present embodiment, the sub backlight module 22 may also be a straight-in type backlight module. The sub light guide plate 222 includes an incident portion and an emergent portion, wherein the emergent portion extends into the through hole 200 and is attached to a sidewall of the through hole 200. The light inlet portion and the sub-LED light source are both located below the bottom wall of the outer frame 211. Light emitted from the secondary LED light source enters the light entrance portion of the secondary light guide plate 222 and then exits from the light exit surface of the light exit portion thereof, thereby lighting the entire upper surface of the through hole 200.
It should be understood that the light emitted from the secondary LED light source 221 is required to illuminate the entire area of the upper surface of the through-hole 200, and the secondary light guide plate 222 should meet any one of the following conditions:
first, a vertical orthographic projection area of the sub light guide plate 222 covers a vertical orthographic projection area of the through hole 200, wherein the vertical orthographic projection is an orthographic projection of which a projection line is vertical. In this case, it is simply summarized that the light-emitting surface of the secondary light guide plate 222 covers the entire cross section of the through hole 200, so that the entire area of the upper surface of the through hole 200 can be illuminated by the light emitted from the secondary LED light source 221 when viewed from the top of the backlight module 20 a. For example, in some examples of the present embodiment, the light-exiting portion of the secondary light guide plate 222 has no through hole penetrating through the upper surface of the light-exiting portion and the bottom surface of the secondary light guide plate 222, and the through hole 200 is covered by the secondary light guide plate 222, so that the upper surface of the through hole 200 can be naturally and completely lighted.
Second, although there are through holes penetrating the upper surface of the light emergent portion and the bottom surface of the sub light guide plate 222 in the light emergent portion of the sub light guide plate 222, for example, although there are through holes penetrating the sub light guide plate 222 in the light emergent portion, the light emergent portion in the light emergent portion is disposed toward the light emergent portion, so that the light emitted from the light emergent portion can illuminate the through holes.
The above two cases are explained below:
first, in the case where there is no through hole in the light exit portion of the sub-light guide plate 222:
example 1:
in some examples of the present embodiment, please refer to a cross-sectional schematic view of the backlight module shown in fig. 3 a: the backlight module 30a includes a main backlight module 31 and a sub backlight module 32, the main backlight module includes an outer frame 311, the bottom wall of the outer frame 311 protrudes upwards to form a protrusion, a through hole 300 penetrating the upper surface of the protrusion and the lower surface of the bottom wall of the outer frame is arranged in the protrusion, and the main backlight module 31 further includes a reflective film, a main LED light source, a main light guide plate, a diffusion sheet and a brightness enhancement film arranged on the bottom wall of the outer frame. The main backlight module 31 is a side-in type backlight module, so the LED chip in the main LED light source has a light-emitting side, and the light-emitting side faces the light-entering side of the main light guide plate. In this embodiment, the top of the protrusion is higher than the upper surface of the brightness enhancement film, so the positions corresponding to the reflection film, the main light guide plate, the diffusion sheet and the brightness enhancement film and the protrusion all need to be perforated, so that the arrangement of the reflection film, the main light guide plate, the diffusion sheet and the brightness enhancement film in the outer frame 311 can be realized.
In fig. 3a, the sub backlight module 32 is a side-in type backlight module, the light-entering surface of the sub light guide plate 322 is located at the side surface of the sub LED light source 321, and the light emitted from the sub LED light source 321 is emitted from the light-emitting side surface thereof and then enters the inside of the sub light guide plate 322 from the light-entering side surface of the sub light guide plate 322. In this embodiment, the lower surface of the sub light guide plate 322 is flush, and the upper surface of the light emitting part is also flush, so in fig. 3a, the sub light guide plate 322 is in a shape of a letter "convex". The convex part in the middle of the convex shape is a light emergent part which extends into the through hole 300 and is attached to the side wall of the through hole 300, and the top surface of the light emergent part is a light emergent surface of the secondary light guide plate 322; the part of the lower surface of the convex shape extending transversely is a light inlet part arranged below the bottom wall of the outer frame 311 and attached to the bottom wall of the outer frame 311.
It is understood that the light emitting portion of the sub light guide plate 322 is required to be attached to the sidewall of the through hole 300, so as to avoid a problem that the light emitting portion on the upper surface of the through hole 300 is uniform due to a gap between the light emitting portion and the sidewall of the through hole 300.
In some examples of the embodiment, the top of the light emitting portion and the top of the protrusion of the outer frame 311 are located on the same horizontal line, so that a partial area of the top of the light emitting portion and an area of the top of the protrusion of the outer frame may jointly form a supporting surface for disposing a double-sided tape, thereby fixing the liquid crystal panel on the backlight module 30a by using the double-sided tape. In order to avoid the influence of the double-sided tape on the display of the liquid crystal panel, in this embodiment, the double-sided tape needs to have light transmittance, and therefore, the double-sided tape used for fixing and attaching the liquid crystal panel is generally white or gray instead of a color with poor light transmittance such as black.
Since the through hole 300 is provided in the protruding portion of the outer frame 311, the area of the protruding portion that can be used for providing the double-sided adhesive tape only remains the hole edge of the through hole 300, and in some examples, the thickness of the hole edge is between 0.05mm and 0.15 mm. And the width of at least 0.4mm is required for providing the supporting surface of the double-sided adhesive tape, and therefore, in this example, the width d of the covering area of the double-sided adhesive tape on the light emergent portion should satisfy 0.25mm < d < 0.35 mm. In one example, the thickness of the rim is 0.1mm, and thus d may take on the value of 0.3 mm.
In FIG. 3a, the sub backlight module 32 is a side-in type backlight module, but in other examples of the present embodiment, the sub backlight module may also be a straight-in type backlight module, for example, in FIG. 3b, the backlight module 30b is similar to the backlight module 30a in FIG. 3a, however, in FIG. 3b, the sub LED light source 381 of the sub backlight module 38 is disposed at the bottom of the sub light guide plate 382, the LED chip of the sub LED light source 381 has a top light emitting surface, and the light emitted from the top light emitting surface can directly enter the sub light guide plate 382 from the bottom light entering portion of the sub light guide plate 382 and then exit from the light exiting portion of the sub light guide plate 382.
As can be seen from fig. 3a and 3b, in the backlight module shown in fig. 3a and 3b, the middle thickness of the secondary light guide plate is larger, which causes the following two problems:
one, because the camera needs through the through hole under the screen to carry out image acquisition, consequently, if vice backlight unit is arranged in the light-emitting portion of through hole too thick, will influence external light and get into camera under the screen, reduce the shooting effect of camera under the screen.
And the thicknesses of the middle part and the edge part of the auxiliary light guide plate are uneven, so that the condition that the middle part of the auxiliary light guide plate is sunken inwards in the injection molding stage is easily caused, and the problem of poor quality of the auxiliary light guide plate is caused.
In order to solve these two problems, the present embodiment further provides some other forms of backlight module:
example 2:
with reference to fig. 2a, in the present example, the light exiting portion of the sub-backlight module 22 extends into the through hole 200, and the upper surface is recessed downward to form a downward recessed groove, which is referred to as a "lower groove". Although the light exiting portion of the sub light guide plate 222 is recessed downward by the lower groove, the recess of the light exiting portion does not reach the bottom surface of the sub light guide plate 222, that is, the lower groove is not a groove penetrating the sub light guide plate 222. In some examples of the present embodiment, the thickness of the bottom of the lower groove is equal to the thickness of the light incoming portion of the secondary light guide plate 222, as shown in fig. 2 a.
In some examples of the embodiment, the top of the sidewall of the lower groove is flush with the top of the protrusion of the outer frame 211, so that the top of the sidewall of the lower groove and the top of the protrusion form a support surface for disposing a double-sided adhesive, thereby fixing the liquid crystal panel on the backlight module 20 a. Similar to the backlight module 30a, the double-sided tape has a certain light transmittance, and is usually white or gray instead of a color with poor light transmittance such as black.
In the embodiment, assuming that the thickness of the hole edge is 0.05mm to 0.15mm after the through hole 200 is formed in the protrusion, in order to form the double-sided adhesive tape on the top of the protrusion and the top of the sidewall of the lower groove, the thickness d of the top of the sidewall of the lower groove should satisfy that d is greater than or equal to 0.25mm and less than or equal to 0.35mm, and in an example, the thickness of the hole edge is 0.1mm, so the value of d may be 0.3 mm.
It will be appreciated that in figure 2a the thickness of the side walls of the lower groove is uniform, i.e. the thickness of the side walls of the lower groove is uniform everywhere, but in other examples of this embodiment the thickness of the side walls of the lower groove may not be uniform throughout, for example, in figure 4 a secondary light guide plate is shown in which the thickness of the side walls of the lower groove increases progressively from top to bottom, in figure 4 the inner side walls of the lower groove are progressively inclined outwardly from bottom to top, or the area of the groove opening of the lower groove is greater than the area of the groove bottom of the lower groove. Of course, those skilled in the art will appreciate that in other examples, the thickness unevenness of the lower groove sidewall may be thickness unevenness of the lower groove sidewall at different positions on the same horizontal plane.
Referring to fig. 2a, the light incident portion of the sub light guide plate 222 is located below the bottom wall of the outer frame 211, and the upper surface of the light incident portion is attached to the bottom wall of the outer frame 211. Since the sub-backlight module 22 in fig. 2a is a side-in type backlight module, the light-entering portion has a light-entering side surface, and the light emitted from the sub-LED light source 221 enters the sub-light guide plate 222 from the light-entering side surface, then enters the through hole 200 through the light-exiting portion of the sub-light guide plate 222, and exits from the light-exiting surface of the light-exiting portion of the sub-light guide plate 222. It can be understood that, in fig. 2a, the light-emitting surface of the secondary light guide plate 22 is not a single surface, but includes a higher light-emitting surface (i.e., the top of the sidewall of the lower groove) and a lower light-emitting surface (i.e., the bottom of the lower groove).
It is needless to say that when the shape of the sub light guide plate is as shown in fig. 2a, the sub backlight module may also be a direct type backlight module, please refer to the backlight module shown in fig. 2 b:
in FIG. 2b, the backlight module 20b is similar to the backlight module 20a in FIG. 2a, however, in FIG. 2b, the secondary LED light source 281 of the secondary backlight module 28 is disposed at the bottom of the secondary light guide plate 282, the LED chips of the secondary LED light source 281 have light emitting top surfaces, and the light emitted from the light emitting top surfaces can directly enter the secondary light guide plate 282 from the light inlet bottom surface of the light inlet portion of the secondary light guide plate 422 and then be emitted from the light outlet portion of the secondary light guide plate 282.
In the backlight module shown in fig. 2a, 2b and 3a, 3b, the lower surface of the secondary light guide plate is flush, however, in other examples of the present embodiment, the lower surface of the secondary light guide plate may not be flush:
example 3:
please refer to fig. 5a, which shows a cross-sectional view of a backlight module: the backlight module 50a includes a main backlight module 51 and a sub backlight module 52, wherein the main backlight module 51 also includes an outer frame 511, and a through hole 500 is disposed in a convex portion on the bottom wall of the outer frame 511, and the through hole 500 penetrates through the upper surface of the convex portion and the lower surface of the bottom wall of the outer frame 511. The main backlight module 51 further includes a reflective film, a main LED light source, a main light guide plate, a diffuser and a brightness enhancement film disposed on the bottom wall of the frame. The main backlight module 51 is a side-in type backlight module. In this embodiment, the top of the protrusion is higher than the upper surface of the bright enhancement film, so the positions corresponding to the reflective film, the main light guide plate, the diffusion sheet and the bright enhancement film and the protrusion all need to be perforated, so that the arrangement of the reflective film, the main light guide plate, the diffusion sheet and the bright enhancement film in the outer frame 511 can be realized.
In fig. 5a, the sub backlight module 52 is a side-in type backlight module, the light-entering surface of the sub light guide plate 522 is located at the side surface of the sub LED light source 521, and the light emitted from the sub LED light source 521 is emitted from the light-emitting side surface of the LED chip, and then enters the sub light guide plate 522 from the light-entering side surface of the sub light guide plate 522. In the present embodiment, the upper surface of the light-emitting portion of the sub light guide plate 522 is flush, and the bottom surface of the sub light guide plate 522 is recessed upward to form an upwardly recessed groove corresponding to the position of the through-hole 500, and the upwardly recessed groove is referred to as an "upper groove" herein. Although the light-emitting portion of the sub light guide plate 522 is recessed upward by the upper groove, the recess of the light-emitting portion does not reach the bottom surface of the sub light guide plate 522, that is, the upper groove is not a groove penetrating the sub light guide plate 522.
In some examples of the embodiment, the top of the light-emitting portion of the sub light guide plate 522 and the top of the protrusion of the outer frame 511 are located at the same horizontal line, so that a partial area of the top of the light-emitting portion and an area of the top of the protrusion of the outer frame 511 may together form a support surface for disposing a double-sided adhesive tape, thereby fixing the liquid crystal panel on the backlight module 50a by using the double-sided adhesive tape. In order to avoid the influence of the double-sided tape on the display of the liquid crystal panel, in this embodiment, the double-sided tape needs to have light transmittance, and therefore, the double-sided tape used for fixing and attaching the liquid crystal panel is generally white or gray instead of a color with poor light transmittance such as black.
Since the through hole 500 is formed in the protruding portion of the outer frame 511, the area of the protruding portion that can be used for disposing the double-sided adhesive tape only has the hole edge of the through hole 500, and in some examples, the thickness of the hole edge is between 0.05mm and 0.15 mm. And the width of at least 0.4mm is required for providing the supporting surface of the double-sided adhesive tape, and therefore, in this example, the width d of the covering area of the double-sided adhesive tape on the light emergent portion should satisfy 0.25mm < d < 0.35 mm. In one example, the thickness of the rim is 0.1mm, and thus d may take on a value of 0.3 mm.
In some examples of the present embodiment, the inner sidewall of the upper groove may be vertical, for example, in fig. 6, a schematic cross-sectional view of a secondary light guide plate in which an angle between the inner sidewall of the upper groove and a groove bottom thereof is 90 °, which means that the areas of the notch of the upper groove and the groove bottom are uniform. Of course, in other examples of the present embodiment, the included angle between the inner sidewall of the upper groove and the bottom of the upper groove may also be 90 ° rounded.
In fig. 5a, the inner side wall of the upper groove is not vertical, and the included angle between the inner side wall of the upper groove and the groove bottom of the upper groove is larger than 90 degrees, so that the area of the notch of the upper groove is larger than that of the groove bottom of the upper groove. Of course, those skilled in the art will appreciate that in other examples, the angle between the inner side wall of the upper groove and the bottom of the groove may be less than 90 °, so that the area from the groove opening of the upper groove to the bottom of the groove gradually decreases.
In some examples of this embodiment, the upper groove notch is sized to receive the lower screen camera portion and extends into the upper groove, such that the upper groove provides a receiving space for the lower screen camera, which provides the following advantages:
firstly, the thickness of the light emitting part of the auxiliary light guide plate 722 is reduced, so that the light path of light in the auxiliary light guide plate 722 is shorter, and the imaging effect of the camera under the screen is enhanced.
The thickness of vice light guide plate mid portion has been cut thin, can promote the equal and degree of vice light guide plate whole thickness, has reduced vice light guide plate and has appeared the possibility that mid portion is inwards sunken in the injection moulding stage, is favorable to promoting the yields of vice light guide plate.
In fig. 5a, the sub backlight module 52 is a side-in type backlight module, but in other examples of the present embodiment, the sub backlight module may also be a straight-in type backlight module, for example, in fig. 5b, the backlight module 50b is similar to the backlight module 50a in fig. 5a, however, in fig. 5b, the sub LED light source 581 in the sub backlight module 58 is disposed at the bottom of the sub light guide plate 582, the LED chips in the sub LED light source 581 have light emitting top surfaces, and the light emitted from the light emitting top surfaces can directly enter the sub light guide plate 582 from the light inlet bottom surface of the sub light guide plate 582 and then be emitted from the light outlet portion of the sub light guide plate 582.
The following description is directed to a backlight module having a through hole on a light-emitting portion of an auxiliary light guide plate:
example 4:
please refer to the schematic cross-sectional view of the backlight module shown in fig. 7 a: the backlight module 70a comprises a main backlight module 71 and a sub backlight module 72, the main backlight module comprises an outer frame 711, the bottom wall of the outer frame 711 protrudes upwards to form a protrusion, a through hole 700 penetrating the upper surface of the protrusion and the lower surface of the bottom wall of the outer frame is arranged in the protrusion, and the main backlight module 71 further comprises a reflecting film, a main LED light source, a main light guide plate, a diffusion sheet and a brightness enhancement film which are arranged on the bottom wall of the outer frame. The main backlight module 71 is a side-in type backlight module. In this embodiment, the top of the protrusion is higher than the upper surface of the brightness enhancement film, so the positions of the reflective film, the main light guide plate, the diffusion sheet and the brightness enhancement film corresponding to the protrusion all need to be perforated, so that the arrangement of the reflective film, the main light guide plate, the diffusion sheet 715 and the brightness enhancement film in the outer frame 711 can be realized.
In fig. 7a, the sub backlight module 72 is a side-in type backlight module, the light-entering surface of the sub light guide plate 722 is located at the side surface of the sub LED light source 721, and the light emitted from the LED chips in the sub LED light source 721 is emitted from the light-emitting side surface thereof and then enters the inside of the sub light guide plate 722 from the light-entering side surface of the sub light guide plate 722. In this embodiment, the upper surface of the light-emitting portion is recessed downward to form a lower groove, the lower surface of the secondary light guide plate 722 is recessed upward to form an upper groove corresponding to the through hole 700, and the lower groove is communicated with the upper groove, thereby forming a through hole penetrating through the upper and lower surfaces of the secondary backlight module 722.
In this embodiment, although there are through holes on the light-emitting portion of the secondary light guide plate 722, so that the vertical orthographic projection of the light-emitting surface of the secondary light guide plate 722 cannot completely cover the through-hole 700, because part of the light-emitting surface of the secondary light guide plate 722 is obliquely disposed, the light emitted from the light-emitting surface of the secondary light guide plate 722 can still illuminate the entire area of the upper surface of the through-hole 700:
in some examples of this embodiment, the area of the lower groove slot is greater than the area of the lower groove base, i.e. the cross-sectional area of the lower groove decreases progressively from the lower groove slot to the lower groove base, corresponding to an angle of greater than 90 ° between the inner side wall of the lower groove and the lower groove base. In this case, not only the top surface of the lower groove sidewall but also the inner sidewall of the lower groove may serve as the light emitting surface of the sub light guide plate 722. It should be appreciated that the light rays exiting the secondary light guide plate 722 are not vertical but are angled upward and toward the axis A-A' of the lower groove so that the light rays exiting the inner side wall of the lower groove illuminate the groove opening.
Assuming that the angle between the inner side wall of the lower groove and the vertical line and the angle between the vertical line are α, α is naturally less than 90 ° because the angle between the inner side wall of the lower groove and the bottom of the lower groove is complementary to α, and in some examples of this embodiment, α is not less than 25 ° and not more than 35 °. For example, in an example of the present embodiment, an angle between the inner sidewall of the lower groove and the vertical line is 25 °, and correspondingly, an angle between the inner sidewall of the lower groove and the bottom of the lower groove is 65 °; in some further examples of this embodiment, the angle between the inner side wall of the lower groove and the vertical is 35 °, corresponding to an angle of 55 ° between the inner side wall of the lower groove and the bottom of the lower groove. In addition, in an example of this embodiment, the angle between the inner sidewall of the lower groove and the vertical line is 30 °, and correspondingly, the angle between the inner sidewall of the lower groove and the bottom of the lower groove is 60 °.
Let the included angle between the inner side wall of the lower groove and the inner side wall of the upper groove be β, in some examples of this embodiment, β is greater than or equal to 75 ° and less than or equal to 85 °. For example, in some examples of this embodiment, the angle between the inner sidewall of the lower groove and the inner sidewall of the upper groove is 75 °, and in some examples of this embodiment, the angle between the inner sidewall of the lower groove and the inner sidewall of the upper groove is 85 °. Of course, it will be understood by those skilled in the art that the value of β may be any other value between 75 ° and 85 °, such as 80 °, etc.
In some examples of this embodiment, the size of the notch of the upper groove can be passed by the camera part under the screen, so as to extend into the upper groove, which is beneficial to improving the utilization rate of the device setting in the terminal to the internal space of the terminal and reducing the thickness of the terminal. Optionally, the inner side wall of the upper groove is not vertical, and the included angle between the inner side wall of the upper groove and the groove bottom of the upper groove is larger than 90 degrees, so that the area of the notch of the upper groove is larger than that of the groove bottom of the upper groove. Of course, it will be understood by those skilled in the art that in other examples, the angle between the inner side wall of the upper groove and the groove bottom thereof may be less than 90 °, so that the total slot opening area of the upper groove gradually decreases from the groove bottom to the groove bottom.
In some examples of the present embodiment, the top of the sidewall of the lower groove is flush with the top of the protrusion of the outer frame 711, so that the top of the sidewall of the lower groove and the top of the protrusion form a support surface for disposing a double-sided adhesive, thereby fixing the liquid crystal panel on the backlight module 70 a. The double-sided tape has a certain light transmittance, and is usually white or gray instead of a color having a poor light transmittance such as black.
In this embodiment, assuming that the thickness of the hole edge is 0.05mm to 0.15mm after the protrusion is provided with the through hole 700, in order to provide the double-sided adhesive tape on the top of the protrusion and the top of the lower groove sidewall, the thickness d of the top of the lower groove sidewall should satisfy that d is greater than or equal to 0.25mm and less than or equal to 0.35mm, and in an example, the thickness of the hole edge is 0.1mm, so the value of d may be 0.3 mm.
In fig. 7a, the sub backlight module 72 is a side-in type backlight module, but in other examples of the present embodiment, the sub backlight module may also be a straight-in type backlight module, for example, in fig. 7b, the backlight module 70b is similar to the backlight module 70a in fig. 7a, however, in fig. 7b, the sub LED light source 781 in the sub backlight module 78 is disposed at the bottom of the sub light guide plate 782, the sub LED light source 781 has a light emitting top surface, and light emitted from the light emitting top surface can directly enter the sub light guide plate 782 from the light entering bottom surface of the light entering portion of the sub light guide plate 782, and then be emitted from the light exiting portion of the sub light guide plate 782.
It should be noted that, in the backlight modules provided in the foregoing examples, except for some differences between the sub-backlight modules, the structure of the main backlight module is basically general, and therefore, the implementation of the devices in the main backlight module in each backlight module can be referred to each other.
In this embodiment, because the sub-screen camera needs to be disposed under the sub-backlight module, the sub-screen camera needs to pass through the through hole of the outer frame to capture an external image, and the sub-LED light source itself is opaque, so that the sub-LED light source should not block the view range of the sub-screen camera, that is, there should be no circuit board or LED chip in the sub-LED light source in the region corresponding to the through hole of the outer frame. Therefore, in the secondary LED light source provided by this embodiment, a camera hole is disposed at a position corresponding to the through hole in the outer frame in the circuit board (i.e., a position corresponding to the light-emitting portion in the secondary light guide plate or a position corresponding to the camera disposed under the screen), and the camera penetrates through the upper and lower surfaces of the circuit board, so that the camera disposed under the screen can jointly acquire images through the camera hole and the through hole in the outer frame.
Of course, if the sub-LED light source itself is composed of a plurality of sets of discrete sub-circuit boards and LED chips, it is not necessary to specially form a camera hole on the sub-circuit board as long as the sub-circuit board does not shield the camera under the screen.
The present embodiment further provides a display screen, where the display screen includes any one of the backlight modules provided in the present embodiment, and meanwhile, the display screen further includes a liquid crystal panel, and the liquid crystal panel fully covers the upper side of the light exit surface of the backlight module and is fixedly connected to the backlight module through a double-sided tape. Of course, it is needless to say that other optical devices may be included in the display panel in addition to the liquid crystal panel.
The embodiment further provides a terminal, where the terminal includes any one of the backlight modules provided in the embodiment, or the terminal includes the display screen. Besides, the terminal also comprises a lower screen camera which is arranged below the backlight module and corresponds to the light emergent part (or the through hole and the camera hole) of the auxiliary light guide plate in position, and the through hole and the camera hole are used for realizing external image acquisition.
In addition, in the embodiment, the operation of the main backlight module and the sub backlight module in the backlight module can be controlled independently, that is, the main backlight module and the sub backlight module can be controlled to be lighted simultaneously, but only the main backlight module can be controlled to be lighted alone, or only the sub backlight module can be controlled to be lighted alone. Therefore, there are a main backlight control circuit and a sub backlight control circuit in the terminal, wherein the main backlight control circuit is disposed in the circuit board of the main LED light source for controlling the lighting of the main light guide plate, and the sub backlight control circuit is disposed in the circuit board of the sub LED light source for controlling the lighting of the sub light guide plate. It can be understood by those skilled in the art that when the terminal controls the under-screen camera to perform shooting, the sub-backlight module should be controlled to stop working, so as to affect image acquisition of the under-screen camera.
According to the backlight module provided by the embodiment of the invention, on the basis that the through hole is formed in the outer frame of the main backlight module to realize the image acquisition of the camera under the screen, the auxiliary backlight module is arranged at the position corresponding to the through hole, and the auxiliary light guide plate in the through hole is lightened by the auxiliary LED light source in the auxiliary backlight module, so that the whole area of the upper surface of the through hole is lightened, the problem that the lightening area of the backlight module is influenced because the camera under the screen cannot be lightened in the partial area of the backlight module because the camera under the screen is arranged on the back surface of the backlight module is avoided, the screen occupation ratio of a display screen and a terminal prepared based on the backlight module is favorably improved, and the user experience of the terminal is enhanced.
Example two:
in this embodiment, a description will be continued on the basis of the first embodiment so that a person skilled in the art can better understand the advantages and the structural details of the backlight module:
no matter the secondary backlight module is a direct-in type backlight module or a side-in type backlight module, and no matter the structure of the secondary light guide plate, in the embodiment, the upper surface of the light inlet part of the secondary light guide plate is attached to the lower surface of the bottom wall of the outer frame of the main backlight module, and the side wall of the light outlet part of the secondary light guide plate is also attached to the inner side wall of the through hole. In other words, the parts of the sub light guide plate corresponding to the outer frame are all attached, so that the problem that the light emitting parts on the upper surface of the through hole are uniform due to the gap between the sub light guide plate and the outer frame can be avoided.
In some examples, the secondary light guide plate is disposed on the outer frame by injection molding, and it should be understood that if the outer frame is an integrated frame made of plastic and iron, the outer frame is originally subjected to one injection molding in the manufacturing process, and when the secondary light guide plate is disposed on the outer frame, the secondary light guide plate is subjected to injection molding again, that is, the iron frame is subjected to two injection molding. It is not obvious to those skilled in the art that the injection molding of the secondary light guide plate may be performed first, and then the injection molding of the glue at the rim of the bezel may be performed.
It should be understood that, if the secondary light guide plate is disposed on the outer frame by integral injection molding, the outer frame is provided with a glue fixing hole for fixing the secondary light guide plate. One outer frame may have only one glue fixing hole for fixing and connecting the sub light guide plate, and in some other examples of this embodiment, two or even a plurality of glue fixing holes for fixing the sub light guide plate may also be present in one outer frame.
Since the glue fixing holes are usually through holes, in order to prevent light of the main backlight module from entering the through holes through the through holes and further from entering the through holes when the sub backlight module should not operate (for example, when the sub backlight module performs shooting), and thus the shooting effect of the sub backlight module is affected, in some examples of this embodiment, the glue fixing holes may be considered to be disposed in a region other than the region where the protruding portion is located on the bottom wall of the outer frame. That is, in this embodiment, the glue fixing hole is prevented from being formed in the side wall of the through hole as much as possible.
Of course, it can be understood by those skilled in the art that in other examples of the present embodiment, the secondary light guide plate is not integrally molded on the outer frame, but is separately manufactured and then mounted on the outer frame. However, in comparison, in the scheme of separately preparing the sub light guide plate and then installing the sub light guide plate, not only the process is complicated and the production cost is high, but also the size of the sub light guide plate is not large, so that the precision requirement is very high when the sub light guide plate is prepared and the sub light guide plate is installed, the production requirement is difficult to achieve, and the problem of high defective rate of the backlight module is easily caused. And vice light guide plate is through the way of integrative moulding plastics setting on the frame, has not only solved the complicated problem of assembly vice light guide plate process on the frame behind the vice light guide plate of independent production, can realize the combination of vice light guide plate and frame high accuracy moreover, is favorable to promoting backlight unit's quality.
Furthermore, because the glue fixing hole of the auxiliary light guide plate is arranged in the region outside the region where the boss is located on the bottom wall of the outer frame, the problem that the shooting effect of the camera under the screen is influenced due to the fact that light of the main backlight module leaks into the through hole is solved.
Example three:
the present embodiment mainly briefly describes the secondary LED light source used in the backlight module:
the secondary LED light source comprises a circuit board and a plurality of LED chips which are fixed on the circuit board and electrically connected with the circuit board. The circuit board is provided with a camera hole penetrating through the upper surface and the lower surface of the circuit board, and the camera hole is used for avoiding the shielding of the auxiliary LED light source on the camera under the screen below the auxiliary LED light source so as to influence the camera to acquire images.
Because the auxiliary backlight module is divided into two types, namely a side-in type backlight module and a straight-in type backlight module, the auxiliary LED light sources adopted in the two types of auxiliary backlight modules will be explained with reference to the accompanying drawings:
if the sub-backlight module is a side-in type backlight module, the light-emitting side surface of each LED chip in the sub-backlight module faces the light-entering side surface of the sub-light guide plate, and the light emitted by each LED chip enters the sub-light guide plate from the light-entering side surface and then exits from the light-exiting surface of the light-exiting portion, so as to illuminate the whole area of the upper surface of the through hole, please refer to a schematic cross-sectional view of the sub-backlight module shown in fig. 8 a: in fig. 8a, the sub backlight module 82 includes a sub light guide plate 822 and a sub LED light source 821, where the sub LED light source 821 includes a circuit board 8210 and LED chips a1 and a2 disposed thereon, and it is understood by those skilled in the art that other LED chips not shown may be further included on the circuit board 8210. In fig. 8a, the sub light guide plate 822 is the sub light guide plate shown in example 1 in the foregoing embodiment in which the light exit portion is flush at the top and the lower surface is also flush, but it is needless to say that the sub light guide plate in fig. 8a may be replaced with the sub light guide plate provided in any other example.
Meanwhile, please further combine the top view of the secondary LED light source 821 shown in fig. 8 b:
because the circuit board 821 itself is opaque, so in order to avoid the circuit board 8210 shielding the under-screen camera, in the sub LED light source 821 provided in this embodiment, a camera hole 8211 is disposed at a position in the circuit board 8210 corresponding to the through hole in the outer frame (i.e., a position in the sub light guide plate corresponding to the light guide portion or a position in the sub light guide plate corresponding to the under-screen camera), and the camera hole 8211 penetrates through the upper and lower surfaces of the circuit board 8210, so that the under-screen camera can perform image acquisition through the camera hole, or partially extend into the sub light guide plate through the camera hole.
As can be seen from fig. 8b, the camera hole 8211 has a circular profile, while the circuit board 8210 has a square overall profile. It can be understood that the outline shape of the image capturing hole 8211 is related to the shape of the cross section of the through hole provided in the main backlight module outer frame, and the cross section of the through hole may be an ellipse, a rectangle, a parallelogram, a regular polygon or other irregular shapes besides a circle, and therefore, the outline shape of the image capturing hole 8211 may also be an ellipse, a rectangle, a parallelogram, a regular polygon or other irregular shapes. The circuit board 8210 is provided with four LED chips, the distances from the circuit board 8210 to the axis of the camera hole 8211 are equal, the four LED chips surround to form a square, and the four LED chips are uniformly distributed on four sides of the auxiliary light guide plate with the square outline. It will be understood by those skilled in the art that, as a side-in type backlight module, the dimension of the circuit board 8210 profile in the sub backlight module 82 should be at least slightly larger than the dimension of the sub light guide plate 822 profile, and if the dimension of the circuit board 8210 profile is only slightly larger than the dimension of the sub light guide plate 822 profile, the LED chips should be distributed at the edge of the circuit board profile. Of course, if the size of the circuit board 8210 is larger than that of the sub-light guide plate 822, the LED chips are not necessarily required to be distributed at the edge of the circuit board 8210.
Of course, if the overall profile of the sub light guide plate 822 is different, the four LED chips may be arranged in different manners, for example, if the profile of the sub light guide plate 822 is consistent with the profile of the circuit board 8210, and the profile of the circuit board 8210 is as shown in fig. 8c, the arrangement manner of the four LED chips on the circuit board 8210 may be referred to the arrangement manner in fig. 8 c.
In some examples of the present embodiment, the sub LED light source includes n LED chips, the n LED chips may surround a positive n-polygon, and each of the n LED chips is equidistant from the axis of the imaging hole 8211. It is needless to say that the value of n may be any one of 3, 6, 8, etc. besides 4, for example, fig. 8d shows a top view of the sub LED light source with several LED chips.
If the sub-backlight module is a direct-in type backlight module, each LED chip in the sub-backlight module is a fixed light-emitting LED chip having a light-emitting top surface, the light-emitting top surface of the LED chip faces the light-entering bottom surface of the sub-light guide plate, and light emitted by each LED chip is emitted from the light-emitting surface of the light-emitting portion after being emitted from the light-entering bottom surface into the sub-light guide plate, so as to illuminate all areas of the upper surface of the through hole, see a schematic cross-sectional view of the sub-backlight module shown in fig. 9 a: in fig. 9a, the sub backlight module 92 includes a sub light guide plate 922 and a sub LED light source 921, where the sub LED light source 921 includes a circuit board 9210 and LED chips a1 and a2 disposed on the circuit board, but it can be understood by those skilled in the art that other LED chips not shown may also be included on the circuit board 9210. In the figure, the sub light guide plate 922 is the sub light guide plate shown in example 2 of the foregoing embodiment, which has a lower groove on the light outgoing portion but has a lower surface flush with the lower surface of the sub light guide plate, but it is needless to say that the sub light guide plate shown in fig. 9a may be replaced with a sub light guide plate provided in any other example.
Meanwhile, please further refer to the top view of the sub LED light source 921 shown in fig. 9 b:
because circuit board 921 itself is opaque, consequently, in order to avoid circuit board 9210 to shelter from camera under the screen, in the vice LED light source 921 that this embodiment provided, in the circuit board 9210 with the position that the through-hole corresponds on the frame (also the position that the light guide part corresponds in vice light guide plate or the position that the camera corresponds under the screen that sets up) can set up a hole 9211 of making a video recording, this hole 9211 of making a video recording runs through circuit board 9210 upper and lower surface, so that let camera carry out image acquisition through this hole of making a video recording under the screen, perhaps stretch into in the vice light guide plate through this hole of making a video recording with the part.
As can be seen from fig. 9b, the outline of the camera hole 9211 is circular, and the outline of the camera hole 9211 is related to the cross section of a through hole disposed in the main backlight module frame, and the cross section of the through hole may be an ellipse, a rectangle, a parallelogram, a regular polygon, or other irregular shapes besides circular, so the outline of the camera hole 9211 may also be an ellipse, a rectangle, a parallelogram, a regular polygon, or other irregular shapes. The circuit board 9210 is circular in overall profile, has set up a plurality of LED chips on it, and the distance that these LED chips are the same apart from the axle center of making a video recording hole 9211 on circuit board 9210 to enclose and close and form a chip ring, these LED chips can surround the hole 9211 evenly distributed that makes a video recording.
In some other examples of the present embodiment, each LED chip in the sub LED light source forms m LED chip rings around the camera hole, and m is equal to or greater than 1. For example, fig. 9c shows a top view of the sub LED light source when m is 2 and 3, respectively. It is understood that the LED chips are required to form a circular ring of LED chips around the camera hole, and it is mainly desired that the secondary light guide plate has uniform light entering from all directions as viewed from the axis of the light emergent portion.
The secondary LED light source provided in this embodiment can be applied to any backlight module including the secondary backlight module in the foregoing embodiments, regardless of the form of the secondary light guide plate in the secondary backlight module.
The vice LED light source that this embodiment provided through set up the hole of making a video recording on a circuit board, can be so that the screen that is located the back of this circuit board under the camera accomplish image acquisition through this hole of making a video recording, simultaneously, vice LED light source can provide light to frame through hole upper surface through vice light guide plate to the problem that the corresponding position of camera can not be lighted under the screen among the backlight unit has been solved, the screen that has improved the terminal accounts for than, has strengthened user experience.
The foregoing is a more detailed description of the embodiments of the present invention, and the specific embodiments are not to be considered as limiting the invention. For those skilled in the art to which the invention pertains, numerous simple deductions or substitutions may be made without departing from the spirit of the invention, which shall be deemed to belong to the scope of the invention.

Claims (10)

1. A backlight module is characterized in that the backlight module comprises a main backlight module and an auxiliary backlight module, the main backlight module comprises an outer frame, a raised part which is raised upwards is arranged on the bottom wall of the outer frame, and a through hole which penetrates through the upper surface of the raised part and the lower surface of the bottom wall is arranged in the raised part;
the auxiliary backlight module comprises an auxiliary LED light source and an auxiliary light guide plate, a penetrating camera hole is formed in the position, corresponding to the penetrating hole, of the auxiliary LED light source, and the camera hole and the penetrating hole are jointly used for image acquisition of an under-screen camera located below the auxiliary backlight module; the auxiliary light guide plate comprises a light inlet part and a light outlet part, the auxiliary LED light source and the light inlet part of the auxiliary light guide plate are both positioned below the bottom wall, the light inlet part transversely extends along the bottom wall and is attached to the lower surface of the bottom wall, the light outlet part of the auxiliary light guide plate extends into the through hole, the upper surface of the light outlet part is flush, and the side wall of the light outlet part is attached to the inner wall of the through hole; a lower groove is arranged in the middle of the upper surface of the auxiliary light guide plate, and/or an upper groove is arranged in the middle of the bottom surface of the auxiliary light guide plate; the light emitted by the auxiliary LED light source enters the light inlet part of the auxiliary light guide plate and then is emitted from the light outlet surface of the light outlet part.
2. The backlight module according to claim 1, wherein the lower surface of the sub light guide plate is flush.
3. The backlight module according to claim 1, wherein the sub light guide plate is disposed by injection molding, and the outer frame is provided with glue fixing holes for fixedly connecting the outer frame and the sub light guide plate.
4. The backlight module as claimed in claim 3, wherein the glue fixing holes are located in the bottom wall at regions other than the region where the protrusions are located.
5. The backlight module according to any of claims 1-4, wherein the top of the light emergent portion and the top of the protrusion are located at the same horizontal line, and a double-sided tape for fixing the liquid crystal panel is disposed on the top of the light emergent portion and the top of the protrusion.
6. The backlight module as claimed in claim 5, wherein the double-sided tape is white or gray.
7. The backlight module as claimed in claim 5, wherein the width of the covered area of the double-sided tape on the light emergent portion is d, and d is greater than or equal to 0.25mm and less than or equal to 0.35 mm.
8. The backlight module of claim 7, wherein d is 0.3 mm.
9. A display screen comprising a liquid crystal panel and the backlight module of any one of claims 1-8, wherein the liquid crystal panel is disposed on the main backlight module.
10. A terminal is characterized by comprising a lower screen camera and the display screen of claim 9, wherein the lower screen camera is arranged below a camera hole of the auxiliary backlight module, and image acquisition is carried out through the camera hole and the through hole.
CN201911049807.3A 2019-10-31 2019-10-31 Backlight module, display screen and terminal Active CN110764309B (en)

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