CN210835521U

CN210835521U - Backlight module, display screen and terminal

Info

Publication number: CN210835521U
Application number: CN201921854412.6U
Authority: CN
Inventors: 徐小康; 姜必武
Original assignee: Shenzhen Techaser Technologies Co Ltd
Current assignee: Shenzhen Techaser Technologies Co Ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-23
Anticipated expiration: 2029-10-31

Abstract

The embodiment of the utility model provides a backlight unit, display screen and terminal sets up the through hole on main backlight unit's the frame, is provided with the hole of making a video recording in the vice LED light source under the through hole to make and be located the screen under the vice backlight unit camera can carry out image acquisition through these two holes, realize shooing. Meanwhile, the light-emitting part of the auxiliary light guide plate in the auxiliary backlight module extends into the through hole, and after light rays emitted by the auxiliary LED light source enter the auxiliary light guide plate, the light rays can be emitted from the light-emitting part in the through hole and illuminate all areas of the upper surface of the through hole, so that the area corresponding to the lower camera arranged in the backlight module can be illuminated, and a foundation is provided for displaying of the area of the display screen. Based on the embodiment of the utility model provides a backlight unit, display screen have promoted the screen at terminal and have occupied the ratio for the full screen can realize on the basis of camera under the screen, is favorable to promoting end user's experience.

Description

Backlight module, display screen and terminal

Technical Field

The utility model relates to a show the field, especially relate to a backlight unit, display screen and terminal.

Background

In the process of continuously pursuing the 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.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a backlight unit, display screen and terminal, the main technical problem who solves is: the area that sets up camera correspondence under the screen in the display screen can't show, and restriction terminal screen accounts for the ratio, influences the problem of terminal display effect.

In order to solve the above technical problem, an embodiment of the present invention provides a backlight module, which is characterized in that the backlight module includes a main backlight module and an auxiliary backlight module, the main backlight module includes an outer frame, a protrusion protruding upward is disposed on a bottom wall of the outer frame, and a through hole penetrating through an upper surface of the protrusion and a lower surface of the bottom wall is disposed in the protrusion;

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 secondary LED light source and the secondary light guide plate are positioned below the bottom wall, the light outlet part of the secondary light guide plate extends into the through hole, the side wall of the light outlet part is attached to the inner wall of the through hole, the upper surface of the light outlet part is downwards sunken to form a lower groove, the position of the lower surface of the secondary light guide plate corresponding to the through hole is upwards sunken to form an upper groove, and the lower groove is communicated with the upper groove; the light emitted by the secondary LED light source enters the light inlet part of the secondary light guide plate and then is emitted from the light outlet surface of the light outlet part, and the whole area of the upper surface of the through hole is lightened.

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 area of the upper groove notch is larger than the area of the bottom of the upper groove notch, and the upper groove notch can allow the lower screen camera positioned below the upper groove notch to at least partially extend into the upper groove.

Optionally, the area of the notch of the lower groove is larger than the area of the bottom of the lower groove, the included angle between the inner side wall of the lower groove and the vertical line is α, and α is more than or equal to 25 degrees and less than or equal to 35 degrees.

Optionally, the included angle between the inner side wall of the lower groove and the side wall of the upper groove is β, and 75 degrees and β degrees and 85 degrees.

Optionally, the top of the lower groove sidewall is flush with the top of the protrusion, and the top of the lower groove sidewall and the top of the protrusion are provided with a double-sided adhesive tape for fixing the liquid crystal panel.

Optionally, the double sided tape is white or gray.

The embodiment of the utility model provides a still provide a display screen, including liquid crystal display panel and as above arbitrary backlight unit, liquid crystal display panel sets up on main backlight unit.

The embodiment of the utility model provides a terminal is still provided, camera and aforementioned display screen under the screen, the camera sets up under vice backlight unit's the hole of making a video recording under the screen, carries out image acquisition through the hole of making a video recording and through hole.

The utility model has the advantages that:

the embodiment of the utility model provides a backlight module, display screen and terminal, wherein, backlight module includes main backlight unit and vice backlight unit, includes the frame among the main backlight unit, has the bellied bellying that makes progress on the diapire of frame, is provided with the through hole that runs through bellying upper surface and diapire lower surface in the bellying. The auxiliary backlight module comprises an auxiliary LED light source and an auxiliary light guide plate, a through camera hole is formed in the position, corresponding to the through hole, of the auxiliary LED light source, the camera hole and the through hole are jointly used for carrying out image acquisition on a camera under a screen, located below the auxiliary backlight module, the light inlet portion of the auxiliary LED light source and the light inlet portion of the auxiliary light guide plate are located in the region outside the through hole below the bottom wall, the light outlet portion of the auxiliary light guide plate extends into the through hole, the side wall of the light outlet portion is attached to the inner wall of the through hole, the upper surface of the light outlet portion is downwards sunken to form a lower groove, the position, corresponding to the through hole, of the lower. The light emitted by the secondary LED light source enters the light inlet part of the secondary light guide plate and then is emitted from the light outlet surface of the light outlet part, so that the whole area of the upper surface of the through hole can be lightened. The embodiment of the utility model provides an in, set up the through hole on main backlight unit's the frame, be provided with the hole of making a video recording in the vice LED light source under the through hole to make and be located the screen under the vice backlight unit camera can carry out image acquisition through these two holes, realize shooing. Meanwhile, the light-emitting part of the auxiliary light guide plate in the auxiliary backlight module extends into the through hole, and after light rays emitted by the auxiliary LED light source enter the auxiliary light guide plate, the light rays can be emitted from the light-emitting part in the through hole and illuminate all areas of the upper surface of the through hole, so that the area corresponding to the lower camera arranged in the backlight module can be illuminated, and a foundation is provided for displaying of the area of the display screen. Based on the embodiment of the utility model provides a backlight unit, display screen have promoted the screen at terminal and have occupied the ratio for the full screen can realize on the basis of camera under the screen, is favorable to promoting end user's experience.

Other features and corresponding advantages of the invention are set forth in the following part of the specification, and it is to be understood that at least some of the advantages become apparent from the description of the invention.

Drawings

Fig. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the present invention;

fig. 2a is a schematic cross-sectional view of a backlight module according to an embodiment 2 of the present invention;

fig. 2b is another schematic cross-sectional view of a backlight module according to an example 2 of the present invention;

fig. 3a is a schematic cross-sectional view of a backlight module according to an embodiment 1 of the present invention;

fig. 3b is another schematic cross-sectional view of a backlight module according to an embodiment 1 of the present invention;

fig. 4 is a schematic cross-sectional view of a sub light guide plate provided in an example 2 of the present invention;

fig. 5a is a schematic cross-sectional view of a backlight module according to an embodiment 3 of the present invention;

fig. 5b is another schematic cross-sectional view of a backlight module according to an embodiment 3 of the present invention;

fig. 6 is a schematic cross-sectional view of a sub light guide plate provided in an example 3 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 a backlight module according to an embodiment 4 of the present invention;

fig. 8a is a schematic cross-sectional view of a side-in type 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 secondary 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 invention;

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 clearly understood, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings by way of specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to 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: the bottom wall of the outer frame 101 is provided with a convex portion protruding upward, and the through hole 100 penetrates through the upper surface of the convex portion 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 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 because the protrusion is shielded, the LED light source of the backlight module is not lit, so that in the display screen prepared based on the backlight module 10, the position corresponding to the through hole 100 cannot normally display images. 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 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 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 formed 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 part and the sub-LED light source are both located below the bottom wall of the outer frame 211. The light emitted from the sub LED light source enters the light entrance portion of the sub light guide plate 222 and then exits from the light exit surface of the light exit portion thereof, thereby illuminating 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 in 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-emitting portion of the secondary light guide plate 222 has no through hole penetrating through the upper surface of the light-emitting 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 penetrating 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 "convex" shape. 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 extending transversely from the lower surface of the convex shape 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 secondary light guide plate 322 is required to be attached to the sidewall of the through-hole 300 in order 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 can jointly form a supporting surface for disposing a double-sided adhesive tape, thereby fixing the liquid crystal panel on the backlight module 30a 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 adhering 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 large, which causes the following two problems:

one, because the camera carries out image acquisition under the screen and need pass through the through-hole, consequently, if vice backlight unit is located the light-emitting portion in the through-hole too thick, will influence outside 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-emitting portion of the sub light guide plate 222 is recessed downward by the lower groove, the recess of the light-emitting 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 incident portion of the secondary light guide plate 222, as shown in fig. 2 a.

In some examples of this 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 the double-sided tape, 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 is 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 sub light guide plate is in the form 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 sub LED light sources 281 of the sub backlight module 28 are disposed at the bottom of the sub light guide plate 282, the LED chips of the sub LED light sources 281 have light emitting top surfaces, and light emitted from the light emitting top surfaces can directly enter the sub light guide plate 282 from the light incoming bottom surface of the light incoming portion of the sub light guide plate 422 and then be emitted from the light outgoing portion of the sub 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 some 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 protrusion on the bottom wall of the outer frame 511, and the through hole 500 penetrates through the upper surface of the protrusion 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 diffusion sheet 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 exits from the light-emitting side surface of the LED chip and 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 at a position corresponding to the through-hole 500 to form an upwardly recessed groove, which 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 adhering 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 the 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 this embodiment, the included angle between the inner sidewall of the upper groove and the groove bottom thereof may be a rounded angle of 90 °.

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, 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 area from the groove opening of the upper groove to the groove bottom is gradually reduced.

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 fig. 7a, which is a schematic cross-sectional view of a backlight module: the backlight module 70a includes a main backlight module 71 and a sub backlight module 72, the main backlight module includes 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 formed in the protrusion, and the main backlight module 71 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 71 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 of the reflective film, the main light guide plate, the diffusion sheet and the bright 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 and the bright 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 the through holes are formed in 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 opening is greater than the area of the lower groove base, i.e. the cross-sectional area of the lower groove decreases from the lower groove opening to the lower groove base, and correspondingly the angle between the inner side wall of the lower groove and the lower groove base is greater than 90 °. 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 is α with respect to the angle between the vertical line and the inner side wall of the lower groove being complementary to α, α is naturally less than 90 with respect to the angle between the inner side wall of the lower groove and the bottom of the lower groove being complementary to α, in some examples of this embodiment, 25 ° ≦ α ° ≦ 35.

Let the angle between the inner sidewall of the lower groove and the inner sidewall of the upper groove be β, in some examples of the present embodiment, 75 ° ≦ β ≦ 85 °. for example, in some examples of the present embodiment, the angle between the inner sidewall of the lower groove and the inner sidewall of the upper groove is 75 °, in some examples of the present embodiment, the angle between the inner sidewall of the lower groove and the inner sidewall of the upper groove is 85 °.

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 this 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 the 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 some 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 sub light guide plate 782 into the light entering portion 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 camera needs to be arranged below the sub-backlight module, the camera needs to pass through the through hole on the outer frame to acquire an external image, and the sub-LED light source itself is opaque, so the sub-LED light source should not shield the viewing range of the camera under the screen, 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 further comprises a lower screen camera, the lower screen camera is arranged below the backlight module, the position of the lower screen camera corresponds to the position of the light emergent part (or the through hole and the camera hole) of the auxiliary light guide plate, and the lower screen camera and the light emergent part realize external image acquisition through the through hole and the camera hole.

In addition, in the embodiment, the operation of the main backlight module and the sub backlight module in the backlight module can be independently controlled, that is, the main backlight module and the sub backlight module can be controlled to be simultaneously lighted, but only the main backlight module can be controlled to be lighted independently, or only the sub backlight module can be controlled to be lighted independently. 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 wiring board of the main LED light source for controlling lighting of the main light guide plate, and the sub backlight control circuit is disposed in the wiring board of the sub LED light source for controlling lighting of the sub light guide plate. As can be understood by those skilled in the art, when the terminal controls the camera under the screen to shoot, the secondary backlight module should be controlled to stop working, so as to affect the image acquisition of the camera under the screen.

The embodiment of the utility model provides a several kinds of backlight unit, set up the through hole in order to realize on the basis of camera image acquisition under the screen in main backlight unit's the frame, can set up vice backlight unit in the position that the through hole corresponds, utilize vice LED light source to light vice light guide plate in the through hole among the vice backlight unit, thereby illuminate all regions of through hole upper surface, avoid because set up the screen down the camera at the backlight unit back and lead to backlight unit upper portion regional can't be lighted because of the camera under the screen, influence the problem of backlight unit light area, be favorable to promoting the display screen based on this kind of backlight unit and preparation, the screen at terminal accounts for the ratio, the user experience at terminal has been strengthened.

Example two:

in this embodiment, a description is continued on the backlight module on the basis of the first embodiment, so that those skilled in the art will better understand the advantages and 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, no matter the structure of the secondary light guide plate is, 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-screen camera performs shooting), the shooting effect of the sub-screen camera 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 disposed on the sidewall 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 sub light guide plate is not large in size, 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 protruding part is arranged 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 avoided.

Example three:

the present embodiment mainly briefly describes the sub 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 secondary LED light source from shielding the camera under the screen below the secondary LED light source so as to influence the secondary LED light source to acquire images.

Since the sub backlight module is divided into two types of side-in type backlight module and straight-in type backlight module, the sub LED light sources used in the two types of sub backlight modules will be described with reference to the accompanying drawings:

if the sub-backlight module is a side-in type backlight module, the light-emitting side of each LED chip in the sub-backlight module faces the light-entering side of the sub-light guide plate, and the light emitted from each LED chip enters the sub-light guide plate from the light-entering side and then exits from the light-exiting side of the light-exiting portion, so as to illuminate the whole area of the upper surface of the through hole, please refer to a cross-sectional schematic diagram of a 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 refer to the top view of the sub 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, it is not necessary to distribute the LED chips 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, but the lower surface of the sub light guide plate is flush with the lower groove, but the sub light guide plate shown in fig. 9a may be replaced with the 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 the ratio, has strengthened user experience.

The foregoing is a more detailed description of embodiments of the present invention, and the specific embodiments are not to be considered in a limiting sense. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

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 LED light source and the light inlet part of the auxiliary light guide plate are both positioned below the bottom wall, the light outlet part of the auxiliary light guide plate extends into the through hole, the side wall of the light outlet part is attached to the inner wall of the through hole, the upper surface of the light outlet part is downwards sunken to form a lower groove, the lower surface of the auxiliary light guide plate is upwards sunken to form an upper groove corresponding to the position of the through hole, and the lower groove is communicated with the upper groove; and 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, so that the whole area of the upper surface of the through hole is lightened.

2. The backlight module as claimed in 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.

3. The backlight module as claimed in claim 2, wherein the glue fixing holes are located in the bottom wall at regions other than the region where the protrusions are located.

4. The backlight module according to any of claims 1-3, wherein the upper groove notch has an area larger than an area of a bottom of the upper groove notch, and the upper groove notch allows the under-screen camera positioned below the upper groove notch to at least partially protrude into the upper groove.

5. A backlight module according to any of claims 1 to 3, wherein the area of the notch of the lower groove is greater than the area of the bottom of the groove, and the angle between the inner side wall of the lower groove and the vertical is α, 25 ° ≦ α ≦ 35 °.

6. A backlight module according to any one of claims 1-3, wherein the inner sidewalls of the lower groove and the sidewalls of the upper groove form an angle of β ° 75 ° β ° 85 °.

7. The backlight module according to any of claims 1-3, wherein the top of the sidewall of the lower groove is flush with the top of the protrusion, and the top of the sidewall of the lower groove and the top of the protrusion are provided with a double-sided tape for fixing the liquid crystal panel.

8. The backlight module as claimed in claim 7, wherein the double-sided tape is white or gray.

9. A display screen, comprising the backlight module as claimed in any one of claims 1 to 8 and a liquid crystal panel, wherein the liquid crystal panel is disposed on the main backlight module.

10. A terminal, comprising the display screen according to claim 9 and a lower-screen camera, wherein the lower-screen camera is disposed below the camera hole of the secondary backlight module, and performs image acquisition through the camera hole and the through hole.