CN108267895B

CN108267895B - LED backlight module, display screen and terminal

Info

Publication number: CN108267895B
Application number: CN201810254104.3A
Authority: CN
Inventors: 李晓娇; 李彪
Original assignee: Chongqing Huiku Technology Co ltd
Current assignee: Dongguan Liyuan Industrial Co ltd
Priority date: 2018-03-26
Filing date: 2018-03-26
Publication date: 2020-12-22
Anticipated expiration: 2038-03-26
Also published as: CN108267895A

Abstract

The embodiment of the invention discloses an LED backlight module, a display screen and a terminal, wherein the LED backlight module comprises a main backlight module and an auxiliary backlight module, the main backlight module comprises a main screen LED light bar and a main screen light guide plate, the auxiliary backlight module comprises at least two sub backlight modules, and each sub backlight module comprises a sub light guide plate and a sub LED light bar; the light energy emitted by the LED light bar of the main screen lights the light guide plate of the main screen; the sub light guide plate is lighted by the light energy emitted by the sub LED light bars. Although the area where the main screen LED lamp strip is located can not be lightened by the main screen LED lamp strip, at least part of the area of the light emitting surface of the sub light guide plate of the at least one sub backlight module is located above the main screen LED lamp strip, so that at least part of the area of the main screen LED lamp strip can be lightened, the area which can not be lightened in the LED backlight module can be reduced, the occupation ratio of the terminal screen can be improved, better visual service is provided for a user, and the user experience is guaranteed.

Description

LED backlight module, display screen and terminal

Technical Field

The invention relates to the technical field of display, in particular to an LED backlight module, a display screen and a terminal.

Background

The display screen serves as an important output device in the terminal for providing information to the user by displaying, and assumes a large part of the output function of the terminal. The user can interact with the terminal by touching the display screen, so that the display screen is controlled to display information which needs to be known by the user, such as photos in an album, chat conversation records, calendar information and the like. In addition to this information, the terminal typically presents the user with conventional information such as the current time, the remaining power of the terminal, the network connection status, etc. in the area at the top of the display screen. In many cases, the user lights up the terminal screen only to know the above conventional information from the top of the terminal, so for the purpose of saving the terminal power and prolonging the endurance time of the terminal, the display screen of the terminal can be divided into a main screen and a sub screen, wherein the above conventional information is displayed in the sub screen, and the main screen and the sub screen can be respectively lighted up. As shown in fig. 1, the main screen 11 and the sub-screen 12 of the terminal may be simultaneously lighted as a whole or may be separately controlled. The main screen LED light bar 110 for lighting the main screen 11 is arranged at the bottom of the terminal 1, and the light emitting direction faces to the top of the terminal 1; and a sub-screen LED light bar 120 for lighting the sub-screen 12 is disposed at the top of the terminal 1, and the light emitting direction is toward the left side of the terminal. However, in this solution, in order to enable the main screen and the sub-screen to be respectively lighted, the areas on the top and right sides of the terminal 1 and the bottom area need to be disposed with LED light bars, so that these areas cannot be lighted themselves, and therefore, these areas belong to the invisible area for the user. Obviously, this may reduce the screen ratio of the terminal, and affect the visual experience of the user.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: because the area that sets up main LED lamp strip and vice LED lamp strip can't be lighted, consequently, lead to the terminal screen to account for not high, user's visual experience is not good, to this technical problem, provides an LED backlight unit, display screen and terminal.

In order to solve the above technical problems, an embodiment of the present invention provides an LED backlight module, which includes a main backlight module and an auxiliary backlight module, wherein the main backlight module includes a main screen LED light bar and a main screen light guide plate; the auxiliary backlight module comprises at least two sub backlight modules, and each sub backlight module comprises a sub light guide plate and a sub LED light bar; at least partial area of the light-emitting surface of the sub light guide plate of the at least one sub backlight module is positioned above the main screen LED light bar, and the light-emitting surface of the main screen light guide plate and the light-emitting surfaces of the sub light guide plates face the same direction; light emitted by the main screen LED lamp strip is emitted from the light incident surface of the main screen light guide plate and is emitted from the light emitting surface of the main screen light guide plate; the light emitted by the sub LED lamp bars of the sub backlight module enters from the light incident surface of the sub light guide plate and exits from the light emergent surface of the sub light guide plate.

Optionally, the at least two sub backlight modules include a first sub backlight module and a second sub backlight module; the light emitting direction of a first sub LED light bar of the first sub backlight module and the light emitting direction of a second sub LED light bar of the second sub backlight module are respectively crossed with the light emitting direction of the main screen LED light bar, and at least partial area of the light emitting surface of at least one of a first sub light guide plate in the first sub backlight module and a second sub light guide plate in the second sub backlight module is located above the main screen LED light bar.

Optionally, the first sub light guide plate in the first sub backlight module and the second sub light guide plate in the second sub backlight module are symmetrically arranged with the central axis of the width of the main screen light guide plate as a symmetry axis.

Optionally, the light emitting direction of the main screen LED light bar is perpendicular to the light emitting direction of the first sub LED light bar and the second sub LED light bar.

Optionally, the light emitting directions of the first sub LED light bar and the second sub LED light bar are opposite or opposite.

Optionally, the light-emitting surface of the main screen light guide plate and the light-emitting surfaces of the sub backlight module sub light guide plates are located on the same plane.

Furthermore, the invention also provides a display screen, which comprises the LED backlight module and a liquid crystal panel arranged above the light-emitting surface of the LED backlight module.

Furthermore, the invention also provides a terminal comprising the LED backlight module.

Optionally, the secondary backlight module of the LED backlight module is located at the top or bottom of the terminal.

Optionally, the terminal further comprises a main screen control circuit and an auxiliary screen control circuit, wherein the main screen control circuit is used for controlling the lighting and extinguishing of the main backlight module; the auxiliary screen control circuit is used for controlling the on and off of the auxiliary backlight module.

Advantageous effects

The embodiment of the invention provides an LED backlight module, a display screen and a terminal, aiming at the problem that visual experience of a terminal user is poor due to the fact that the ratio of a terminal screen provided with a main screen and an auxiliary screen is not high in the prior art, the LED backlight module provided by the invention comprises a main backlight module and an auxiliary backlight module, wherein the main backlight module comprises a main screen LED light bar and a main screen light guide plate, the auxiliary backlight module comprises at least two sub backlight modules, and each sub backlight module comprises a sub light guide plate and a sub LED light bar; light emitted by the main screen LED lamp strip can be emitted from the light incident surface of the main screen light guide plate and emitted from the light emergent surface of the main screen light guide plate, and the main screen light guide plate is lightened; the light emitted by the sub LED lamp bars in the sub backlight module enters from the light incident surface of the sub light guide plate and exits from the light emergent surface of the sub light guide plate, so that the sub light guide plate is lightened. Although the area where the main screen LED light bar is located cannot be lightened by the main screen LED light bar, because at least part of the light-emitting surface of the sub light guide plate of the at least one sub backlight module is located above the main screen LED light bar, and the light-emitting surface of each sub light guide plate and the light-emitting surface of the main screen light guide plate face the same direction, compared with the prior art, the area where the main screen LED light bar and the sub screen LED light bar are located cannot be lightened. The LED backlight module is applied to the display screen and the terminal, the invisible area on the terminal can be reduced, the terminal screen occupation ratio is improved, better visual service is provided for a user, and the user experience is guaranteed.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic structural diagram of a first conventional LED backlight module;

FIG. 2a is a schematic diagram illustrating a lighting effect of the conventional LED backlight module shown in FIG. 1;

FIG. 2b is another schematic diagram of the lighting effect of the conventional LED backlight module shown in FIG. 1;

FIG. 3a is a schematic diagram of a lighting effect of a second conventional LED backlight module;

FIG. 3b is another schematic diagram of a lighting effect of a second conventional LED backlight module;

fig. 4 is a top view of an LED backlight module according to a first embodiment of the invention;

fig. 5 is a top view of another LED backlight module according to a first embodiment of the present invention;

fig. 6 is a top view of another LED backlight module according to a first embodiment of the present invention;

fig. 7 is a schematic view of a central axis of a width of a main screen light guide plate according to a first embodiment of the present invention;

fig. 8 is a top view of an LED backlight module according to a second embodiment of the present invention;

FIG. 9 is a cross-sectional view of the LED backlight module of FIG. 8 taken along line A-A';

FIG. 10 is a cross-sectional view of the LED backlight module of FIG. 8 taken along line B-B';

fig. 11 is a partial cross-sectional view of an LED backlight module according to a third embodiment of the present invention;

fig. 12a is a schematic diagram illustrating a lighting effect of the first terminal according to the fourth embodiment of the present invention;

fig. 12b is another schematic diagram of the lighting effect of the first terminal according to the fourth embodiment of the present invention;

fig. 12c is a further schematic diagram of the lighting effect of the first terminal according to the fourth embodiment of the present invention;

fig. 13a is a schematic diagram illustrating a lighting effect of the second terminal according to the fourth embodiment of the present invention;

fig. 13b is another schematic diagram of the lighting effect of the second terminal according to the fourth embodiment of the present invention;

fig. 14 is a schematic diagram of a hardware structure of a mobile terminal according to a fourth embodiment of the present invention.

Detailed Description

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:

in order to facilitate understanding of differences and advantages between the LED backlight module provided by the embodiment of the present invention and the conventional schemes, before describing the scheme provided by the present invention, the present embodiment first describes several conventional LED backlight modules, please continue to refer to fig. 1:

it should be understood that the illumination of the primary screen 11 is achieved by a primary backlight module and the illumination of the secondary screen 12 is achieved primarily by a secondary backlight module. In one arrangement, the main panel 11 and the sub-panel 12 share a light guide plate. In this scheme, when the main screen 11 is lit, the main screen LED light bar 110 in the main backlight module operates, and since the light guide plates of the main and sub backlight modules are an integral, when the main screen LED light bar 110 operates, all visible areas in the main screen 11 and the sub screen 12 can be lit at the same time, as shown in fig. 2 a. However, when the user wants to only light the sub-screen 12, the light emitted by the sub-screen LED light bar 120 enters the area of the light guide plate where the main screen 11 is located, and causes a part of the area of the main screen 11 to be lighted, as shown in fig. 2b, the effect of only lighting the sub-screen 12 cannot be strictly achieved, and the user experience is poor.

In another conventional scheme, the light guide plate between the main backlight module and the sub backlight module is independent, or may be regarded as the light guide plate in the first scheme is cut into two parts, namely, a main screen light guide plate and a sub screen light guide plate. Since the main panel light guide plate is independently separated from the sub-panel light guide plate, when only the main panel 11 is lit, the schematic view is as shown in fig. 3 a; when only the secondary screen 12 is lighted, the light of the secondary screen LED light bar 120 is not incident on the area of the primary screen 11, as shown in fig. 3 b. When both the main screen 11 and the sub-screen 12 are lit, the lighting effect can be seen in fig. 2 a.

In addition to the two previous solutions, a solution is also presented here: in this solution, the main backlight module is independent of the light guide plate in the sub backlight module, wherein the sub screen light guide plate still only covers the visible area of the user on the sub screen 12, and the main screen light guide plate covers both the visible area of the main screen 11 and the visible area of the sub screen 12. Thus, when the main screen LED light bar 110 is lit, all the visible areas are lit, and the lighting effect can be seen in fig. 2 a; when only the sub-screen LED light bar 120 is operated, the sub-screen LED light bar 120 only enters the sub-screen light guide plate, and thus only the sub-screen 12 is lit, as shown in fig. 3 b.

As the display demand of the user on the terminal is continuously increased, the "screen duty" of the terminal becomes one of the important points of attention when the user selects a product. In the foregoing solutions, no matter how the main backlight module and the sub backlight module are arranged, it is not changed that the main LED light bar 110 in the main backlight module is arranged at the bottom of the terminal 1, and the sub LED light bar in the sub backlight module is arranged in the area on the right of the top of the terminal 1. Of course, in some scenarios, the LED light bar of the secondary backlight module may also be disposed at the left side of the top of the terminal, and emit light to the right side of the terminal. However, no matter how the arrangement is, the area of the terminal 1 where the main screen LED light bar 110 is arranged at the bottom and the area where the sub screen LED light bar 120 is arranged at the top cannot be lighted as the display area, and the user cannot naturally know any display information from the areas.

In order to promote the screen ratio of the terminal, make the terminal have better display effect, this embodiment provides an LED backlight unit:

the LED backlight module comprises a main backlight module and an auxiliary backlight module, wherein the main backlight module comprises a main screen LED lamp bar and a main screen light guide plate, and the main backlight module can be a side-in type backlight module. Light emitted by the main screen LED lamp strip is emitted into the main screen light guide plate from the light incident surface of the main screen light guide plate and is emitted from the light emergent surface of the main screen light guide plate, so that the main screen LED light guide plate is lightened. Under the condition that the top surface of the main screen LED lamp bar does not emit light, the main screen LED lamp bar cannot light the area where the main screen LED lamp bar is located. However, in the LED backlight module provided in this embodiment, the LED backlight module further includes a sub backlight module, and the sub backlight module includes at least two sub backlight modules. Each sub backlight module comprises a sub LED light bar and a sub light guide plate respectively, and light emitted by the sub LED light bar can be emitted from the light incident surface of the sub light guide plate matched with the sub LED light bar and is emitted from the light emitting surface of the sub light guide plate, so that the sub light guide plate is lightened. In this embodiment, the light-emitting surface of each sub light guide plate and the main panel light guide plate face the same direction. And at least partial area of the light-emitting surface of at least one sub light guide plate in each sub backlight module is positioned above the main screen LED light bar, so that at least partial area of the main screen LED light bar can be lightened along with the lightening of the sub light guide plates, and the area which cannot be lightened in the whole LED backlight module is greatly reduced.

It should be understood that the "light bar" in this embodiment may be a light emitting device including two or more LED chips and having a long bar shape, or may be a light emitting device including only a single LED chip.

In an example of this embodiment, the main screen LED light bar is located in the downward forward projection area of the secondary backlight module, that is, the main screen LED light bar can be almost completely shielded by the secondary backlight module when the LED backlight module is overlooked from a direction perpendicular to the light emitting surface of the LED backlight module. Under the condition, the area of the top surface of the main screen LED lamp strip can be lightened by the sub light guide plate of the auxiliary backlight module to the maximum extent. In the best case, the areas that cannot be lit remain only in the area where each of the sub LED light bars is located.

In this embodiment, the light emitting direction of the main screen LED light bar is respectively intersected with the light emitting direction of each sub-LED light bar, that is, the light emitting direction of the main screen LED light bar is not parallel to the light emitting direction of each sub-LED light bar. In some examples, the light emitting direction of the main screen LED light bar and the light emitting direction of the sub LED light bars are perpendicular to each other. For example, the main screen LED light bar is along the length direction of the main screen light guide plate, and the light emitting direction of the sub LED light bars is along the width direction of the main screen light guide plate.

Assuming that the sub-backlight module includes N sub-backlight modules, in some examples of the present embodiment, N may be equal to 1, in which case, the LED backlight module includes a main backlight module and a sub-backlight module, and the sub-backlight module is the sub-backlight module. In other examples, N is greater than or equal to 2. For example, the LED backlight module may include a main backlight module and at least two sub backlight modules, as shown in fig. 4, the LED backlight module 40 includes the main backlight module, the main backlight module includes a main screen LED light bar and a main screen light guide plate 412, the LED backlight module 40 further includes three sub backlight modules 42 (including a first sub backlight module 42a, a second sub backlight module 42b and a third sub backlight module 43c), and the three sub backlight modules 42 are all disposed above the main screen LED light bar of the main backlight module. When looking down from the direction perpendicular to the light-emitting surface of the LED backlight module 40, the main screen LED light bar is covered by the first sub backlight module 42a, the second sub backlight module 42b and the third sub backlight module 42 c.

In another example of the present embodiment, the sub backlight module includes a first sub backlight module and a second sub backlight module. It can be understood that the light emitting directions of the sub-LED light bars in the first sub-backlight module and the second sub-backlight module may be the same or opposite. When the light emitting directions of the sub-LED light bars are the same, the two sub-backlight modules are as the first sub-backlight module 42a and the second sub-backlight module 42b (or the second sub-backlight module 42b and the third sub-backlight module 42c) in fig. 4. Next, the situation that the light emitting directions of the sub LED light bars of the first sub backlight module and the second sub backlight module are opposite is mainly described:

when the light emitting directions of the sub-LED light bars of the two sub-backlight modules of the first sub-backlight module and the second sub-backlight module are opposite, the sub-LED light bars of the two sub-backlight modules can emit light relatively, as shown in FIG. 5: the sub-LED light bars of the first sub-backlight module 52a and the second sub-backlight module 52b are respectively disposed at two ends of the main screen LED light bar, and the sub-screen light guide plate of the whole sub-backlight module (i.e., the first sub-light guide plate 522a of the first sub-backlight module 52a and the second sub-light guide plate 522b of the second sub-backlight module 52 b) is disposed between the two sub-LED light bars (i.e., the first sub-LED light bar 521a and the second sub-LED light bar 521b), i.e., the sub-light guide plates of the first sub-backlight module 52a and the second sub-backlight module 51b are disposed adjacent to each other. In some examples of the present embodiment, the specifications of the first sub backlight module 52a and the second sub backlight module 52b may be the same or different, and therefore, the area of the first sub light guide plate 522a and the area of the second sub light guide plate 522b may be the same or different.

When the light emitting directions of the sub LED light bars of the two sub backlight modules of the first sub backlight module and the second sub backlight module are opposite, the sub LED light bars of the two sub backlight modules can emit light back, as shown in fig. 6: there is no light guide plate between the sub-LED light bars of the first sub-backlight module 62a and the second sub-backlight module 62b, and they are disposed closely. The first sub light guide plate and the second sub light guide plate are respectively located at two sides of the secondary LED light bars of the whole secondary backlight module (i.e. the first sub LED light bar of the first sub backlight module 62a and the second sub LED light bar of the second sub backlight module 62 b). In fig. 6, the first sub LED light bar in the first sub backlight module 62a emits light to the left, the second sub LED light bar in the second sub backlight module 62b emits light to the right, and the first sub LED light bar and the second sub LED light bar are disposed adjacent to each other and located between the two sub light guide plates. For the arrangement mode in fig. 5, in the LED backlight module 60 in fig. 6, because the first sub LED light bar and the second sub LED light bar are close to each other and are close to each other, the whole sub screen LED light bar is gathered together, that is, the area that can not be lighted in the LED backlight module 60 is concentrated together, so that the integrity of the area that can be lighted in the LED backlight module is better. When the LED backlight module is applied to a display screen, the visual effect is better.

Certainly, when the sub LED light bars of the first sub backlight module and the second sub backlight module emit light in a back direction, a certain gap may exist between the first sub backlight module and the second sub backlight module, and when the LED backlight module is applied to a terminal display screen, the gap between the first sub backlight module and the second sub backlight module may be configured with other devices of the terminal, such as a camera, a receiver, and the like.

In an example of this embodiment, the first sub backlight module and the second sub backlight module are symmetrically disposed with a central axis of a width of the main panel light guide plate as a symmetry axis. As shown in fig. 7, the width central axis C-C' is a central axis parallel to the length direction of the main screen light guide plate. Therefore, the LED backlight module has good overall symmetry, and when the LED backlight module is applied to a terminal, the terminal has more symmetrical beauty during display, and the aesthetic concept of the majority of users is better met. More importantly, on the terminal, the earphone, the front camera and other devices are basically arranged at the top end of the front face of the terminal and close to the central axis C-C' of the width. Therefore, when the sub LED light bars of the first sub backlight module and the second sub backlight module emit light back to each other, the distance between the first sub backlight module and the second sub backlight module and the width central axis are equal, and the sub LED light bars of the first sub backlight module and the second sub backlight module are arranged in close proximity, the area of the LED backlight module which cannot be lighted is just located near the width central axis C-C'. When the LED backlight module is applied to the terminal, if the auxiliary backlight module is positioned at the top end of the front side of the terminal, devices such as a camera of the terminal can be arranged in the area which cannot be lightened, so that the area which is invisible to a user on the terminal is reduced to the greatest extent, and the screen occupation ratio of the terminal is improved. It should be understood that, when the first sub backlight module and the second sub backlight module are disposed with the central axis of the width as the symmetry axis, the specifications of the first sub backlight module and the second sub backlight module are the same, as shown in fig. 7.

The present embodiment further provides a display screen, where the display screen includes the LED backlight module provided in the present embodiment and a liquid crystal panel disposed above the light exit surface of the LED backlight module. Of course, it is needless to say that other optical devices may be included in addition to the liquid crystal panel.

The embodiment also provides a terminal, and the terminal comprises the LED backlight module provided by the embodiment. When the LED backlight module is disposed in the terminal, the sub-backlight module is generally located at an edge portion of the front face of the terminal, for example, may be disposed at the top or bottom of the front face of the terminal, and may be even disposed at the left or right side of the front face of the terminal.

The LED backlight module provided by this embodiment may include at least two sub backlight modules as sub backlight modules, and the sub LED light bars of the two sub backlight modules may emit light back to back, so that the regions that cannot be lit in the LED backlight module are concentrated together, and the integrity of the lit regions in the LED backlight module is improved.

Furthermore, the first sub backlight module and the second sub backlight module can be symmetrically arranged by taking the width central axis of the main screen light guide plate as a symmetry axis, the overall symmetry of the LED backlight module is better under the condition, and after the LED backlight module is applied to a terminal, the terminal is more symmetrical and beautiful during display, and the user experience can be effectively improved.

Example two:

in order to make those skilled in the art better understand the advantages of the LED backlight module of the present invention, the present embodiment will further describe the structure of the LED backlight module in the foregoing examples:

in an example of the embodiment, when the number of the sub backlight modules in the sub backlight module is greater than or equal to 2, the sub backlight modules have similar structures. And the relative positions of each sub backlight module and the main backlight module are similar. Taking a back-to-back light emitting manner of sub LED light bars of a first sub backlight module and a second sub backlight module in an LED backlight module as an example, a relationship between each sub backlight module and a main backlight module in the LED backlight module is described. Since the first sub backlight module and the second sub backlight module have similar structures except that the arrangement directions are opposite, the embodiment is described with reference to the relationship between the first sub backlight module and the main backlight module, please refer to fig. 8 to 10:

fig. 8 is a top view of the LED backlight module, and fig. 8 shows the main screen light guide plate 812 of the main backlight module, and the first sub backlight module 82 and the second sub backlight module 83 disposed above the main screen LED light bar (not shown in fig. 8). FIG. 9 is a partial cross-sectional view of the LED backlight module of FIG. 8 along line A-A':

as can be seen from fig. 9, the LED backlight module 80 includes a main backlight module 81, a first sub backlight module 82, and a second sub backlight module (not shown in fig. 9), when the LED backlight module 80 is applied to a terminal, the main backlight module 81 is used to realize the lighting and information of the main screen, and the first sub backlight module 82 can realize the lighting and information of the first sub screen. The main backlight module 81 comprises a main screen LED light bar 811 and a main screen light guide plate 812; the first sub backlight module 82 includes a first sub LED light bar 821 and a first sub screen light guide plate 822. Light emitted from the main screen LED light bar 811 can enter from the light incident surface on the side of the main screen light guide plate 812 and exit from the light exiting surface (the upper surface of the main screen light guide plate 812 in fig. 9) of the main screen light guide plate 812. The first sub backlight module 82 is disposed above the main screen LED light bar 811, at least a partial region of the first sub-screen light guide plate 822 is located on the main screen LED light bar 811, and light emitted from the first sub-LED light bar 821 can be incident from a light incident surface of a side surface of the first sub-light guide plate 822 and be emitted from a light emitting surface of the first sub-light guide plate 822, so as to illuminate the first sub-light guide plate 822. Due to the arrangement mode, even if the top surfaces of the main screen LED light bar 811 and the first sub-LED light bar 821 do not emit light, and the main backlight module 81 and the first sub-backlight module 82 are both side-in type backlight modules, since the first sub-screen light guide plate 822 can be lit, at least a partial area of the area where the main screen LED light bar 811 is located can be lit, so that the area which cannot be lit in the LED backlight module 80 can be reduced.

In the embodiment, the light emitting surfaces of the first sub light guide plate 822, the main panel light guide plate 812 and the second sub light guide plate (not shown in fig. 9) are oriented in the same direction. In some examples of the present embodiment, the main screen LED light bar 811 is entirely located in the downward forward projection area of the first sub backlight module 82 and the second sub backlight module 83, so that the main screen LED light bar 811 is almost entirely shielded by the first sub backlight module 82 and the second sub backlight module 83 when the LED backlight module 80 is overlooked from the direction perpendicular to the light exit surface of the main screen light guide plate 822.

In this embodiment, the light emitting directions of the main screen LED light bar 811 and the first sub LED light bar 821 are perpendicular to each other, wherein the light emitting direction of the main screen LED light bar 811 is along the length direction of the main screen light guide plate 812, the light emitting direction of the first sub LED light bar 821 is along the width direction of the main screen light guide plate 812, and of course, the light emitting direction of the second sub LED light bar 822 is also along the width direction of the main screen light guide plate 812.

Considering that the main screen LED light bar 811 and the main screen light guide plate 812 are not tightly attached to each other in the main backlight module 81, light emitted from the main screen LED light bar may be emitted through a gap between the main screen LED light bar 811 and the main screen light guide plate 812, so that a small amount of light may exist on the first sub-screen when the first sub-backlight module 82 stops working, which affects user experience. Therefore, in an example of the embodiment, the main backlight module 81 further includes an opaque main light shielding layer 813, and the main light shielding layer 813 is disposed between the main screen LED light bar 811 and the first sub backlight module 82, as shown in fig. 9. The main light shielding layer 813 covers the top surface of the main screen LED light bar 811, and is used to prevent light that does not enter the main screen light guide plate 812 from exiting from the area outside the light exit surface of the main screen light guide plate 812, especially entering each light guide plate in the sub backlight module. The opaque main shading layer 813 is used to ensure that light emitted from the main screen LED light bar 811 does not pass through the main shading layer 813. In some examples of the present embodiment, at least one of the upper and lower surfaces of the main light-shielding layer 813 is colored. Typically, color will be applied to both the upper and lower surfaces. It should be understood that the main light shielding layer 813 has a certain reflection effect on the light emitted from the main screen LED light bar 811, so that in order to prevent the light emitted from the main screen LED light bar 811 from reflecting on the lower surface (the surface close to the main screen LED light bar 811) of the main light shielding layer 813 to have a color different from the original color, in an example of the present embodiment, the lower surface of the main light shielding layer 813 may be white, silver, or black. The lower surface of the common main light shielding layer 813 is black, so that light rays of the main screen LED light bar 811 irradiating the main light shielding layer 813 can be absorbed as much as possible, and reflection is reduced.

Since the main light shielding layer 813 covers the top surface of the main screen LED light bar 811 and is located between the first sub backlight module 82 and the main screen LED light bar 811, the main light shielding layer 813 can also serve as a first sub reflective film of the first sub backlight module 82, and reflects light emitted by the first sub LED light bar 821 and then passes through the top surface of the first sub screen light guide plate 822, that is, the light emitting surface thereof. Therefore, in order for the main light-shielding layer 813 to simultaneously perform the function of the first sub-reflective film, in some of the present embodiments, the upper surface (the side close to the sub-backlight module) of the main light-shielding layer 813 may be white or silver.

It can be understood that the second sub backlight module and the main screen LED light bar 811 can also be separated by the main light shielding layer 813. Therefore, the LED backlight module shown in fig. 9 includes a main light-shielding layer. Generally, the area of the main light shielding layer 813 is larger than the area of the top surface of the main screen LED light bar 811, so that one main light shielding layer can prevent the light emitted from the main screen LED light bar 811 from being incident on the first sub light guide plate 821 and the second sub light guide plate, and thus the light emitted from the main screen LED light bar 811 cannot be emitted from the region other than the light emitting surface of the main screen light guide plate 812 as much as possible. Of course, in some other examples of this embodiment, the main light shielding layer may be formed by at least two sub light shielding layers. For example, when the main light-shielding layer is composed of two independent sub-light-shielding layers, different sub-light-shielding layers are disposed under different sub-backlight modules.

In an example of the present embodiment, one side of the main screen light guide plate 812 of the main backlight module 81, which is close to the main screen LED light bar, is in a step shape with at least two steps, wherein the step shape at least includes a first step with a step surface flush with the top surface of the main screen LED light bar; in some examples of the present embodiment, the step of the top layer in the main screen light guide plate 812 is a second step, and the step surface of the second step is flush with the light emitting surface of the first sub-screen light guide plate 822. Therefore, in the present embodiment, the light emitting surfaces of the first sub light guide plate 822, the second sub light guide plate and the main panel light guide plate 812 are located on the same plane. As shown in fig. 9, the main screen light guide plate 812 includes two steps: a first step 812a and a second step 812b, wherein the first step 812a is located at a lower layer. The step surface of the first step 812a is flush with the top surface of the main screen LED lamp strip 811, so that when the top surface of the main screen LED lamp strip 811 covers the main light shielding layer 813, the main light shielding layer 813 can simultaneously cover the step surface of the first step 812a, and the first step 812a can support the main light shielding layer 813 to a certain extent. It should be understood that the larger the width of the first step 812a in the length direction of the main screen light guide plate 812 is, that is, the larger the width d in fig. 9 is, the greater the supporting effect of the first step 812a on the main light shielding layer 813 is, and in some examples of the present embodiment, the width d of the first step 812a in the length direction of the main screen light guide plate 812 is greater than or equal to 0.95 mm. Optionally, in one example thereof the width d of the first step 812a is 1 mm. In addition, in the embodiment, the step surface of the second step 812b is flush with the light emitting surface of the first sub-screen light guide plate 822, so that the overall effect of the lighted area in the LED backlight module 80 is better when the main backlight module 81 and the first sub-backlight module 82 work simultaneously.

It can be understood that the main screen LED light bar 811 and the first sub LED light bar 821 both have circuit boards, wherein the main screen LED light bar 811 includes a main screen LED chip and a main screen circuit board electrically connected to the main screen LED chip, the main screen circuit board is disposed on a bottom surface of the main screen LED chip, as shown in fig. 9, the bottom surface of the main screen LED chip can be connected to the main screen circuit board, that is, the main screen LED chip is disposed on an upper surface of the main screen circuit board, and the main screen circuit board supports the main screen LED chip while being electrically connected to the main screen LED chip. Meanwhile, in the embodiment, the area of the upper surface of the main screen circuit board is larger than that of the lower surface of the main screen LED chip, so that the main screen circuit board can support other devices besides the main screen LED chip. For example, in fig. 9, the first step 812a of the main panel light guide plate 812 is disposed on the main panel circuit board, so that the main panel circuit board may support one end of the main panel light guide plate 812. In fig. 9, the other portion of the main panel light guide plate 812 is disposed on the main panel reflection film 814, and the main panel reflection film 814 reflects light irradiated thereto and then emits the light through the upper surface of the main panel light guide plate.

Since a certain gap may exist between the first sub LED light bar 821 and the first sub screen light guide plate 822 in the first sub backlight module 82, a part of light emitted by the first sub LED light bar 821 may not enter the first sub screen light guide plate 822, but is projected to the front surface of the LED backlight module 80 along the gap between the first sub LED light bar 821 and the first sub screen light guide plate 822. Meanwhile, in the general lateral-entering first sub backlight module, the first sub LED light bar 821 cannot light the area where the first sub LED light bar is located, and therefore, the sporadic light rays penetrating through the gap may cause poor visual experience of display devices such as terminals, and the like, in an example of this embodiment, the first sub backlight module 82 further includes an opaque first sub light shielding layer 823 disposed above the first sub LED light bar 821, and the opaque first sub light shielding layer 823 is used for preventing light that does not enter the light incident surface on the side surface of the first sub screen light guide plate 822 from being emitted outwards, and generally, the area of the first sub light shielding layer 823 is larger than that of the top surface of the first sub LED light bar 821, so that light emitted by the first sub LED light bar 821 can be shielded, and it is ensured that light emitted by the first sub LED light bar 821 cannot be emitted from an area other than the top surface of the first sub screen.

Since the sub-screen LED light bars (i.e., the first sub-LED light bar 821 and the second sub-LED light bar) of the sub-backlight module in the LED backlight module shown in fig. 8 are disposed at a same position and are adjacent to each other, two sub-light shielding layers between the first sub-backlight module 82 and the second sub-backlight module 83, i.e., the first sub-light shielding layer 823 of the first sub-backlight module 82 and the second sub-light shielding layer of the second sub-backlight module in fig. 9, may be a whole and simultaneously block the light above the first sub-LED light bar 821 and the second sub-LED light bar.

The circuit board in the first sub-LED light bar 821 is referred to as a first sub-circuit board (not shown in fig. 9), and the first sub-circuit board is disposed on the top surface of the first sub-screen LED chip (not shown in fig. 9) and between the first sub-screen LED chip and the first sub-light shielding layer 823. It should be understood that, in some examples of the present embodiment, the first sub circuit board in the first sub LED light bar 821 may also be disposed on the bottom surface of the first sub screen LED chip.

FIG. 10 is a partial cross-sectional view of the LED backlight module of FIG. 8 taken along line B-B':

since the positions of the cross-sections are different in the LED backlight module, in fig. 10, the first sub LED light bar cannot be shown, but the first sub light guide plate 822 can be shown. Except for this, the detail shown in fig. 10 is similar to the detail shown in fig. 9.

Although the area where the main screen LED light bar is located in the main backlight module cannot be lighted by the main screen LED light bar, the area where the first sub-LED light bar is located in the first sub-backlight module cannot be lighted by the first sub-LED light bar, and at least two areas possibly exist in the main backlight module and the first sub-backlight module and cannot be lighted, the first sub-backlight module is arranged on the main screen LED light bar by the LED backlight module provided by the embodiment, so that the main screen LED light bar is covered by the first sub-backlight module, at least one part of the area where the main screen LED light bar is located can be lighted by the first sub-backlight module, the area which cannot be lighted in the LED backlight module can be reduced, after the LED backlight module is applied to terminal display, the area which is invisible to a user on a terminal display screen can be effectively reduced, and the area ratio of the terminal screen is improved.

Example three:

the present embodiment will continue to describe the LED backlight module provided by the present invention:

in an example of this embodiment, the LED backlight module includes a main backlight module and a sub backlight module, wherein the main backlight module includes a main screen LED light bar, a main screen light guide plate, and a main light shielding layer, and the main light shielding layer is disposed on the main screen LED light bar and has an area larger than an area of a top surface of the main screen LED light bar. In this embodiment, the main light shielding layer is an integral body, that is, the main light shielding layer is disposed under the first sub backlight module and the second sub backlight module at the same time, and plays a role of the sub-reflective film of the first sub backlight module and the sub-reflective film of the second sub backlight module at the same time. For various implementation examples of the main light-shielding layer, reference may be made to the description of the second embodiment, in which in this embodiment, the lower surface of the main light-shielding layer is black, and the upper surface of the main light-shielding layer is white.

The secondary screen backlight module comprises a first sub backlight module and a second sub backlight module, each backlight module comprises a sub LED light bar and a sub light guide plate, and the sub LED light bars of the first sub backlight module and the second sub LED light bars of the second sub backlight module form a secondary screen LED light bar together; the first sub light guide plate of the first sub backlight module and the second sub light guide plate of the second sub backlight module jointly form an auxiliary screen light guide plate. The main backlight module and the auxiliary backlight module belong to a side-in type backlight module, and the first sub backlight module and the second sub backlight module are arranged on a main shading layer of the main backlight module. The first sub backlight module and the second sub backlight module have similar structures, and the relative positions of the first sub backlight module and the second sub backlight module with the main backlight module are also similar. Taking the first sub backlight module as an example: the first sub LED lamp strips are perpendicular to the main screen LED lamp strips, light emitted by the main screen LED lamp strips is emitted from the side face of the main screen light guide plate along the length direction of the main screen light guide plate, and light emitted by the first sub LED lamp strips is emitted from the side face of the first sub light guide plate along the width direction of the main screen light guide plate.

In this embodiment, the main panel light guide plate and the sub light guide plate can be made of high-tech materials with very high reflectivity and no light absorption, and the bottom surface of the optical acrylic plate is printed with light guide dots by laser engraving, V-shaped cross grid engraving, and UV screen printing techniques. Taking the main screen light guide plate as an example for explanation, when light emitted by the main screen LED light bar irradiates each light guide point in the main screen light guide plate, reflected light will diffuse toward each angle, and then the reflected light is broken and emitted from the top surface of the main screen light guide plate. The main screen light guide plate can uniformly emit light through various light guide points with different densities and sizes.

The structure of the main screen light guide plate in this embodiment is similar to that of the main screen light guide plate in the second embodiment, and one side of the main screen light guide plate close to the main screen LED light bar is in a step shape with at least two steps. Therefore, the main light shielding layer is already supported at the side close to the main screen light guide plate. In order to support the main light shielding layer at the side opposite to the main screen light guide plate, in this embodiment, a support wall is disposed at the side of the main screen LED light bar opposite to the main screen light guide plate. One side of the support wall close to the main screen LED lamp strip is in a step shape with at least two stages, wherein the support wall comprises a first step of which the step surface is flush with the top surface of the main screen LED lamp strip. Therefore, in this embodiment, the main light shielding layer can cover the top surface of the main screen LED light bar, the step surface of the first step, and the step surface of the first step at the same time, and these three layers support the main light shielding layer at the same time. Like the main light shielding layer, the supporting wall in this embodiment is also a whole, and the first step supports the region of the main light shielding layer under the first sub backlight module and the region of the main light shielding layer under the second sub backlight module. Of course, in other examples of the present embodiment, the support wall may be formed by at least two sub-support walls.

In this embodiment, the supporting wall and the main panel light guide plate are both provided with two steps, as shown in fig. 11, and fig. 11 is a partial cross-sectional view of an LED backlight module. Wherein, the support wall 113 includes a first step 113a and a second step 113 b; the main panel light guide plate includes a first step 1112a and a second step 1112 b. The step surface of the first step 1112a is flush with the step surface of the first step 113a in the support wall 113 and the top surface of the main screen LED light bar 1111, and the main light shielding layer 1113 is simultaneously disposed on the step surfaces of the first step 1112a and the first step 113a and the top surface of the main screen LED light bar 1111. By the shielding of the main light shielding layer 1113, almost no light emitted from the main screen LED light bar 1111 is transmitted through the region covered by the main light shielding layer 1113. In this embodiment, the first sub backlight module 112 is disposed on the main light shielding layer 1113, so although the light emitted from the main screen LED light bar 1111 cannot illuminate the area covered by the main light shielding layer 1113, the first sub light guide plate 1122 can be illuminated by the first sub LED light bar 1121, so that the area where the main light shielding layer 1113 is located, that is, the area that cannot be illuminated by the main screen LED light bar 1111 originally, can be partially illuminated by the first sub LED light bar 1121.

A main reflection film for reflecting light is disposed under the main screen light guide plate 1112. Since the function of the sub-reflective film can be simultaneously realized by the main light shielding layer 1113, in the present embodiment, a special sub-reflective film is not provided. However, it is understood that in some examples of the present embodiment, the main light shielding layer 1113 and the sub-reflective film may be independent from each other, wherein the sub-reflective film is disposed on the main light shielding layer 1113. The first step 1112a of the main panel light guide plate 1112 is still disposed on the main panel circuit board, which supports the first step 1112a of the main panel light guide plate 1112.

In this embodiment, the first sub backlight module 112 further includes a first sub-light-shielding layer 1123, the first sub-light-shielding layer 1123 covers the supporting wall 113 and the first sub-LED light bars 1121, and the lower surface of the first sub-light-shielding layer 1123 is white, black or silver. The first sub LED light bar 1121 includes a first sub LED chip and a first sub circuit board, the first sub LED chip is electrically connected to the first sub circuit board, and the first sub circuit board is disposed above the first sub LED chip and between the first sub LED chip and the first sub light shielding layer 1123.

In the LED backlight module 110 shown in fig. 10, the LED backlight module further includes an outer frame 114, the outer frame 114 includes a side wall 1142 and a bottom wall 1141, and the bottom wall 1141 and the side wall 1142 enclose a receiving chamber for receiving the main backlight module 111, the sub backlight module and the support wall 113. The support wall 113 of the LED backlight module 110 is disposed closely to the side wall 1142 of the outer frame 114, the upper surface of the support wall 113 is flush with the top surface of the side wall 1142, and the sum of the thicknesses of the support wall 113 and the side wall 1142 along the length direction of the main screen light guide plate is greater than or equal to 0.75 mm. In an example of the present embodiment, the first sub-shielding layer 1123 partially covers the top surface of the side wall 1142 of the outer frame 114, in addition to covering the first sub-LED light bars 1121 and the supporting wall 113.

Now, assuming that the side of the first sub-light shielding layer 1123 away from the side wall 1142 is the distal end side, the shortest distance between the distal end side and the outer surface of the side wall 1142 is 4.2-4.7 mm. In some examples of this implementation, the shortest distance is 4.5 mm.

It should be understood that, in some examples of the present embodiment, a diffusion sheet, a prism sheet, and the like may be further disposed on the main screen light guide plate and the sub-screen light guide plate. In an example of the present embodiment, a diffusion plate, a lower prism sheet, an upper prism sheet, and the like may be sequentially disposed above the main panel light guide plate and the sub-panel light guide plate from bottom to top.

The LED backlight module that this embodiment provided improves through the position between main backlight unit and the vice backlight unit for vice backlight unit covers on main backlight unit can not lighted the region, lights vice screen light guide plate through vice screen LED, and then makes originally can not be lighted the region can have the part by the lighting. So earlier to the condition that the region that sets up main screen LED lamp strip place region and vice screen LED lamp strip in the current scheme can not be lighted, among the LED backlight unit that this embodiment provided, can reach only the region that sets up vice screen LED lamp strip and can not be lighted the effect, reduced the region that can not be lighted to very big degree, after using this kind of LED backlight unit to the terminal, can promote the screen of this terminal and account for the ratio.

Furthermore, in this embodiment, a main light shielding layer is disposed between the main screen LED light bar and the auxiliary backlight module, and the main light shielding layer covers the main screen LED light bar, the first step of the support wall, and the first step of the main screen light guide plate, so as to completely cover the main screen LED light bar and the gaps around the main screen LED light bar, thereby ensuring the operation of the main backlight module, and when the auxiliary backlight module does not operate, the light emitted by the main screen LED light bar cannot be transmitted from other places except the upper surface of the main screen light guide plate, which affects the visual experience of the user.

Example four:

in order to make the LED backlight module and the application thereof more clear to those skilled in the art, the present embodiment will continue to describe the LED backlight module, the display screen and the terminal provided in the foregoing embodiments:

in some examples, the terminal comprises a main screen control circuit and an auxiliary screen control circuit, wherein the main screen control circuit is used for controlling the on and off of the main backlight module; and the auxiliary screen control circuit is used for controlling the on-off of the auxiliary backlight module. Due to the separation of the control circuits, the main backlight module and the sub-backlight module can be controlled separately due to the separation of the control circuits, and the terminal 12 can control the main backlight module and the sub-backlight module to operate simultaneously, so as to illuminate all the display areas of the terminal 12 simultaneously, as shown in fig. 12 a. In addition, the terminal 12 can also control the main backlight module to work alone, so as to realize the lighting of the main screen of the terminal 12, as shown in fig. 12 b. The terminal 12 may also control the sub backlight module to work alone, so as to light up the sub screen of the terminal 12, as shown in fig. 12 c. For example, the terminal 12 may be controlled to light its secondary screen when the user only needs to know the current time. The control scheme can not influence the user to obtain the display information, but can save the electric quantity of the terminal, prolong the endurance time of the terminal and further improve the user experience.

In addition, in the embodiment, the LED backlight module may include at least two sub backlight modules, and whether each sub backlight module works or not may be controlled together as a whole or separately. For example, a first sub-screen control circuit and a second sub-screen control circuit are included in the terminal 13 shown in fig. 13 a. The first auxiliary screen control circuit is used for controlling the on-off of the first sub-backlight module, and the second auxiliary screen control circuit can control the on-off of the second sub-backlight module, so that the terminal 13 can control the second sub-backlight module in the LED backlight module to work, and only the right auxiliary screen of the terminal 13 is lighted. It is understood that, since the main backlight module and the sub backlight module can be controlled separately, it is possible that the terminal 13 may have a sub screen portion area illuminated while the main screen is illuminated, as shown in fig. 13 b.

The terminal provided by the embodiments of the present invention may be implemented in various forms. For example, mobile terminals such as mobile phones, tablet computers, notebook computers, palmtop computers, Personal Digital Assistants (PDAs), Portable Media Players (PMPs), navigation devices, wearable devices, smart bands, pedometers, and fixed terminals such as Digital TVs, desktop computers, and the like. In the embodiments of the present invention, any device having a display screen may be regarded as a terminal.

The following description will be given by way of example of a mobile terminal, and it will be understood by those skilled in the art that the construction according to the embodiment of the present invention can be applied to a fixed type terminal, in addition to elements particularly used for mobile purposes.

Referring to fig. 14, which is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention, in the following description, suffixes such as "module", "component", or "unit" used to represent elements are used only for facilitating the description of the present invention, and have no specific meaning in themselves. Thus, "module", "component" or "unit" may be used mixedly. The mobile terminal 200 may include: an RF (Radio Frequency) unit 201, a WiFi module 202, an audio output unit 203, an a/V (audio/video) input unit 204, a sensor 205, a display unit 206, a user input unit 207, an interface unit 208, a memory 209, a processor 210, and a power supply 211. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 14 is not intended to be limiting of mobile terminals, and that a mobile terminal may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.

While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An LED backlight module is characterized by comprising a main backlight module and an auxiliary backlight module, wherein the main backlight module comprises a main screen LED lamp bar and a main screen light guide plate; the auxiliary backlight module comprises at least two sub backlight modules, and each sub backlight module comprises a sub light guide plate and a sub LED light bar; at least partial area of the light emitting surface of at least one sub backlight module sub light guide plate is positioned above the main screen LED light bar, and the light emitting surface of the main screen light guide plate and the light emitting surface of each sub light guide plate face the same direction; light emitted by the main screen LED lamp strip is emitted from the light incident surface of the main screen light guide plate and is emitted from the light emergent surface of the main screen light guide plate; the light emitted by the sub LED lamp strip of the sub backlight module enters from the light incident surface of the sub light guide plate and is emitted from the light emitting surface of the sub light guide plate; the at least two sub backlight modules comprise a first sub backlight module and a second sub backlight module; the light emitting direction of the first sub LED light bar of the first sub backlight module and the light emitting direction of the second sub LED light bar of the second sub backlight module are respectively crossed with the light emitting direction of the main screen LED light bar, and at least partial area of the light emitting surface of at least one of the first sub light guide plate in the first sub backlight module and the second sub light guide plate in the second sub backlight module is located above the main screen LED light bar.

2. The LED backlight module according to claim 1, wherein the first sub light guide plate of the first sub backlight module and the second sub light guide plate of the second sub backlight module are symmetrically disposed with a central axis of a width of the main screen light guide plate as a symmetry axis.

3. The LED backlight module of claim 2, wherein the light emitting direction of the main screen LED light bar is perpendicular to the light emitting direction of the first sub LED light bar and the second sub LED light bar.

4. The LED backlight module of claim 3, wherein the first sub-LED light bar and the second sub-LED light bar emit light in opposite directions.

5. The LED backlight module according to any of claims 1-4, wherein the light-emitting surface of the main screen light guide plate and the light-emitting surfaces of the sub backlight module sub light guide plates are located on the same plane.

6. A display screen, characterized in that the display screen comprises the LED backlight module as claimed in any one of claims 1 to 5 and a liquid crystal panel arranged above the light-emitting surface of the LED backlight module.

7. A terminal, characterized in that it comprises an LED backlight module according to any one of claims 1-5.

8. The terminal of claim 7, wherein the secondary backlight module of the LED backlight module is located at the top or bottom of the terminal.

9. The terminal according to any one of claims 7 or 8, wherein the terminal further comprises a main screen control circuit and an auxiliary screen control circuit, the main screen control circuit is used for controlling the on and off of the main backlight module; the auxiliary screen control circuit is used for controlling the auxiliary backlight module to be turned on and off.