CN111679507B

CN111679507B - Backlight module and display device

Info

Publication number: CN111679507B
Application number: CN202010619018.5A
Authority: CN
Inventors: 倪德鹏
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2022-05-17
Anticipated expiration: 2040-06-30
Also published as: CN111679507A

Abstract

The embodiment of the application discloses backlight unit and display device includes: the metal frame comprises a bottom plate and side plates arranged on the periphery of the bottom plate, and the side plates and the bottom plate form an accommodating space; a flexible circuit board disposed at one side of the base plate; the flexible circuit board comprises a main body part and a first extension part, and the main body part is positioned in the accommodating space; the light source is arranged on one side of the main body part, which is far away from the bottom plate; the side plates comprise a first side plate, the flexible circuit board is arranged adjacent to the first side plate, and the side plates comprise hollow parts; the first extending part penetrates through the hollow part and extends to the outside of the accommodating space; the first extending portion comprises at least one bending portion, and in the direction perpendicular to the first side plate, the projection of the bending portion and the projection of the hollowed-out portion are at least partially overlapped. The embodiment of the application can solve the problem of light leakage of the hollow part of the backlight module and ensure the display effect.

Description

Backlight module and display device

Technical Field

The invention relates to the technical field of display, in particular to a backlight module and a display device.

Background

In recent years, mobile terminals such as personal computers that display a touch function have been widely used along with cellular phones. In order to meet diversified use requirements of users and enhance user experience, the display device in the prior art is a trend of a full screen display device. To achieve a full screen, the bezel of the display device is typically narrowed.

Under the market demand of high screen ratio, the design in non-display area is littleer and smaller, because display device's backlight unit includes LED lamp strip, a great deal of parts such as membrane material, usually in order to realize narrow frame, can assemble LED lamp strip with the mode of anti-group, that is to say, in the design of anti-group, LED lamp strip is located the downside of light guide plate, bonds with chase bottom. In the assembling process, the iron frame is required to be provided with an opening to avoid the LED lamp strip, and the LED lamp strip extends out of the opening to be electrically connected with the IC. Therefore, the light leakage is caused by the fact that the light shielding glue used for the opening of the iron frame cannot be closed, uneven display is caused, and customer experience is influenced. Therefore, how to realize a narrow frame and ensure a display effect becomes a problem to be solved urgently.

Content of application

In view of the above, the present invention provides a backlight module and a display device to solve the technical problems in the prior art.

In one aspect, the present invention provides a backlight module, including:

the metal frame comprises a bottom plate and side plates arranged on the periphery of the bottom plate, and the side plates and the bottom plate form an accommodating space;

a flexible circuit board disposed at one side of the base plate; the flexible circuit board comprises a main body part and a first extension part, and the main body part is positioned in the accommodating space;

the light source is arranged on one side of the main body part, which is far away from the bottom plate;

the side plates comprise a first side plate, the flexible circuit board is arranged adjacent to the first side plate, and the first side plate comprises a hollow part;

the first extending part penetrates through the hollow part and extends to the outside of the accommodating space;

the first extending part comprises at least one bending part, and the bending part and the projection of the hollow part are at least partially overlapped in the direction perpendicular to the side plate.

On the other hand, compared with the prior art, the backlight module provided by the invention at least realizes the following beneficial effects:

the invention provides a backlight module, which comprises a metal frame, wherein the metal frame comprises a bottom plate and side plates arranged on the periphery of the bottom plate, and the side plates and the bottom plate form an accommodating space; a flexible circuit board disposed at one side of the base plate; the flexible circuit board comprises a main body part and a first extension part, and the main body part is positioned in the accommodating space; the light source is arranged on one side of the main body part, which is far away from the bottom plate; the side plates comprise a first side plate, the flexible circuit board is arranged adjacent to the first side plate, and the side plates comprise hollow parts; the first extending part penetrates through the hollow part and extends to the outside of the accommodating space; the light source is electrically connected with the flexible circuit board and extends out of the accommodating space through the hollow part of the side plate to be connected with the IC.

The first extending part further comprises a bending part, and the projection of the bending part and the projection of the hollow part are at least partially overlapped, so that the problem that the hollow part cannot be covered by the shading adhesive tape is effectively solved, and the problem that light emitted by a light source penetrates out of the hollow part in a display stage to cause uneven display due to light leakage is solved. When realizing narrow frame, set up the kink at flexible circuit board, can need not increase the process in the equipment stage, practiced thrift the human cost, solved the light leak problem.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

FIG. 1 is a schematic top plan view of an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A' of FIG. 1;

FIG. 3 is a schematic view of another structure of a backlight module according to an embodiment of the invention;

FIG. 4 is a schematic view of another structure of a backlight module according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a backlight module according to another embodiment of the present invention;

fig. 8 is a structural schematic diagram of a display panel according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

A backlight module and a display device provided by embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a backlight module, comprising:

The backlight module provided by the invention effectively solves the problem that the hollow part cannot be covered by the shading adhesive tape, so that the problem of uneven display caused by light leakage due to the fact that light passes out of the hollow part in the display stage of a light source is solved.

Referring specifically to fig. 1 and 2, fig. 1 is a schematic plan top view of an embodiment of the present invention; fig. 2 is a schematic cross-sectional view taken along line a-a' of fig. 1. The invention provides a backlight module, comprising: the metal frame 30 comprises a bottom plate 301 and side plates 303 arranged on the periphery of the bottom plate, and the side plates 303 and the bottom plate 301 form an accommodating space;

the backlight module further comprises a light guide plate 40, an optical film material 50 and a light shielding glue 60.

The metal frame 30 forms an accommodating space for carrying the light source 20, the optical film 50, and the like.

Alternatively, the receiving space may be entirely constituted by a metal frame, typically an iron frame. Preferably, the bottom plate is made of a metal frame, and the side plates can be formed by integrally forming a partial metal frame and the bottom plate and partially forming a rubber frame, which is technically called a rubber-iron integral frame. The glue and iron integrated frame can play a role in fixing the film material, and meanwhile, the weight of the backlight module can be reduced.

A flexible circuit board 10 disposed at one side of the base plate 301; the flexible circuit board 10 includes a main body portion 101 and a first extension portion 102, wherein the main body portion 101 is located in the accommodating space; and a light source 20 disposed on a side of the main body 101 away from the bottom plate 301. The light source 20 is soldered to the main body 101 of the flexible circuit board 10, extends outside the metal frame 30 through the first extension 102, and is connected to an IC of the electronic device. Therefore, the side plate 303 includes a first side plate 302, the flexible circuit board 10 is disposed adjacent to the first side plate 302, and the first side plate 302 includes a hollow 3021; the first extending portion 102 passes through the hollow portion 3021 and extends to the outside of the accommodating space.

It should be noted that the size and the opening range of the metal frame hollow portion can be adjusted according to the requirement of the product, and fig. 1 is an exemplary representation and does not limit the size and the opening range of the hollow portion.

When the light source 20 is in an operating state, the light source 20 is turned on, the emitted light penetrates out of the accommodating space formed by the metal frame 30 through the hollow portion 3021, so that the light is emitted out of the first side plate 302 to cause light leakage, thus, when the backlight module operates, the brightness of the position of the hollow portion 3021 is too high, and the other positions of the first side plate are not provided with the hollow portion, so that no light penetrates out, and the light is contrasted with the hollow portion 3021, which causes abnormal display of the display device.

In the present invention, at least one bending portion 1021 is disposed on the first extending portion 102, referring to fig. 2, in a direction perpendicular to the first side plate 302, a projection of the bending portion 1021 and the hollow portion 3021 is at least partially overlapped. Like this, the light that light source 20 sent will be blockked by kink 1021, prevent that light from wearing out from fretwork portion 3021, reduce the condition of fretwork portion 3021 light leak, has promoted display effect and user experience. Moreover, the bending part 1021 is directly formed by the first extending part 102, so that no additional assembly part is required, no additional process difficulty and risk are increased, the process applicability is strong, the cost is saved, and the problem of display light leakage is improved.

Referring to fig. 3, fig. 3 is a schematic structural diagram of another embodiment of the present invention, in which at least one light shielding layer 70 is disposed on a surface of the first extending portion 102 away from the bottom plate 30.

Generally, the material of flexible circuit board is the PI substrate, and flexible circuit board includes the PI substrate polyimide substrate promptly, owing to possess the pliability, consequently makes flexible circuit board easily crooked as the carrier of other membranes on the flexible circuit board usually, satisfies the equipment demand, possesses toughness simultaneously, makes the difficult rupture of flexible circuit board at the in-process that the equipment was buckled, has improved the stability of circuit. One side of the PI substrate is generally provided with a copper foil layer, and the copper foil layer is used for setting a circuit of a flexible circuit board, so as to realize a connection mode between light sources on the flexible circuit board and meet the wiring requirement of a control light source signal. The PI film is bonded and fixed on one side of the copper foil layer to protect the copper foil layer from being insulated from the outside and to protect circuit wiring in the copper foil layer from short circuit.

In the invention, the flexible circuit board 10 includes the main body 101 and the first extending portion 102, the first extending portion 102 includes at least one bending portion 1021, and a projection of the bending portion 1021 and the hollow portion 3021 in a direction perpendicular to the first side plate 302 is at least partially overlapped, and further, at least one layer of light shielding layer 70 is disposed on a side of the first extending portion 1021 away from the bottom plate 301, so that a light shielding effect of the bending portion 1021 is improved. The light emitted from the light source 20 is absorbed by the light shielding layer 70 coated on the bending portion 1021, so that the light is difficult to pass through the hollow portion 3021, and the display effect is ensured.

Optionally, the light shielding layer 70 may be a light shielding tape, and in the assembling process, after the main body 101 of the flexible circuit board 10 is fixed on the bottom plate 30, the light shielding tape is attached to the surface of the first extending portion 102 away from the bottom plate 30, so that the light emitted by the light source 20 is absorbed by the light shielding tape, and the light is difficult to penetrate through the hollow portion 3021, thereby improving the light leakage problem and ensuring the display effect.

Preferably, the light shielding layer 70 may be black ink, the flexible circuit board 10 sprays the black ink on the first extending portion 102 of the flexible circuit board 10 through a spraying process, and then the first extending portion 102 forms at least one bent portion 1021 through a molding process. In the molding process, the apparatus generally includes a set of fixed molds, and after the flexible circuit board is fixed on the fixed molds, the first extending portion of the flexible circuit board is formed into a bent portion by pressing down and heating the movable molds.

The light emitted from the light source 20 is absorbed by the light shielding layer 70 coated on the bending portion 1021, so that the light is difficult to pass through the hollow portion 3021, and the display effect is ensured. Meanwhile, the black ink is arranged on the first extension portion 102 by using a spraying process, so that the light shielding effect can be ensured, the thickness of the first extension portion 102 does not need to be increased, and the backlight assembly is facilitated.

Referring to fig. 4, fig. 4 is a schematic structural diagram of another embodiment of the present invention. The bent portion 1021 includes a first side portion a, the first side portion a is disposed opposite to the light source 20 along a direction parallel to the bottom plate 301, and a reflective layer 80 is disposed on a side of the first side portion a away from the bottom plate 30.

Specifically, referring to fig. 4, since the reflective layer 80 is disposed on the first side a of the bending portion 1021, and the reflective layer 80 is made of a material with high reflectivity, when the light source 20 is in a light emitting state, the light emitted from the light source 20 is reflected on the surface of the reflective layer 80, so that the light returns to the position of the light guide plate 40, and the light is prevented from passing through the hollow portion 3021, and at the same time, the brightness of the display area is compensated, and the utilization rate of the light is improved.

Alternatively, the reflective layer 80 may be made of metal silver, or may be made of other metal plating films with high reflectivity, which is not limited herein.

Further, referring to fig. 5, fig. 5 is a schematic structural diagram of another embodiment of the present invention. The bending part 1021 further comprises a bending bottom b and a second side part c, the first side part a is connected with the bending bottom b, the second side part c is connected with the bending bottom b, and the first side part and the second side part a are arranged opposite to each other along a direction parallel to the bottom plate 301; and at least one layer of light shielding layer is arranged on one side of the bent bottom b and the second side part c far away from the bottom plate.

Specifically, since the first side portion a is disposed opposite to the light source 20 and the reflective layer 80 is disposed on the first side portion a, the light emitted from the light source 20 is reflected by the reflective layer 80 to the light guide plate 40 and the optical film 50 on the surface of the first side portion a, so as to reduce the light leakage caused by the light entering the hollow portion 3021. Furthermore, at least one light-shielding layer 70 is disposed on the bent bottom b and the second side c, and when part of the light is not reflected by the reflective layer, the light is further absorbed by the light-shielding layer at the bent bottom b and the second side c, so as to ensure that the light emitted from the light source 20 does not pass through the hollow portion 3021, thereby causing light leakage.

Optionally, the light shielding layer may be the first extending portion 102 sprayed with black ink, or may be a light shielding tape.

Referring to fig. 6, fig. 6 is a schematic structural diagram of another embodiment of the present invention. The bending part 1021 comprises a first side part a, a bending bottom b and a second side part c, the first side part a is connected with the bending bottom b, the second side part a is connected with the bending bottom b, and the first side part a and the second side part b are arranged oppositely; the bent portion 1021 further comprises a bonding block 90, which is located at the bent bottom portion 90.

Specifically, since the flexible circuit board 10 is made of the PI substrate, the flexible circuit board 10 has a certain flexibility, which is beneficial for flexible bending when assembling the backlight module. The bending portion 1021 is usually formed by hot pressing through a mold, the bonding block 90 is added at the bending bottom b to fix the first side portion a, the bending bottom b and the second side portion c together, so that the stability of the shapes of the first side portion a, the bending bottom b and the second side portion c is enhanced, and the phenomenon that the bending portion 1021 is deformed due to stress in the assembling process to influence the assembling effect is avoided.

The bond block 90 may be formed by curing glue, alternatively, using UV glue curing to form the bond block 90.

After the first extension portion 102 is hot-pressed by a mold to form the bending portion 1021, a proper amount of UV glue is dripped into the bending bottom b, so that the UV glue is fully contacted with the first side portion a, the bending bottom b and the second side portion c, UV irradiation is performed, the UV glue is cured to form the bonding block 90, the shape of the bending portion 1021 is stabilized, and the shading effect is ensured.

Optionally, with continued reference to fig. 6, a bonding block 90 may be disposed between the 2 adjacent bending portions, so as to ensure the form of each bending portion, and further enhance the stability between the 2 adjacent bending portions, so that the structure of the first extending portion is more stable, and the light shielding effect is ensured.

Referring to fig. 7, fig. 7 is a schematic structural diagram of another embodiment of the present invention. In a direction perpendicular to the bottom plate 30, a height L of the bent portion 1021 is greater than a height H of the light source 20.

In the backlight module, the light source 20 is typically an LED, which is soldered on the main body 101 of the flexible circuit board 10, electrically connected to the IC through the first extension 102, and controlled by the IC. Generally, the height range of the LED is 0.4-0.6 mm, and the height L of the bending portion is greater than the height of the LED, so as to effectively block the light emitted from the light source 20, and prevent the light from being emitted from the hollow portion 3021 to cause light leakage and affect the display effect.

Further, with reference to fig. 7, in a direction perpendicular to the first side plate 101, a projection of the bending portion 1021 covers a projection of the hollow portion 3021. The projection of the bending portion 1021 covers the projection of the hollow portion 3021, that is, in a direction perpendicular to the first side plate 302, the bending portion 1021 covers the hollow portion 3021, and the light source 20 is prevented from leaking light due to the blocking of the bending portion 1021 from the hollow portion 3021, which affects the display effect.

With reference to fig. 7, the bending portion 1021 includes a first side portion a, a bending bottom b, and a second side portion c, the first side portion a is connected to the bending bottom b, the second side portion c is connected to the bending bottom b, and the first side portion a and the second side portion c are disposed opposite to each other;

the first distance between the first side part a and the second side part c is D, the first distance D is parallel to the direction of the bottom plate, and D is more than or equal to 0.25mm and less than or equal to 0.3 mm.

Specifically, because the distance R from the lamp source 20 to the first side plate is usually 0.3-0.5 mm, when D is more than or equal to 0.25mm and less than or equal to 0.3mm, the bent part can be accommodated in the iron frame, the distance from the LED to the side wall of the iron frame does not need to be additionally increased, and the narrow bottom border is ensured. When D is less than 0.25, the bending effect of the flexible circuit board is poor, and the effect of shading is difficult to play. When D is greater than 0.3, the distance R between the first side plate of the light source 20 needs to be increased, which results in an increased frame and is not favorable for the narrow frame design of the display device.

With reference to fig. 7, at least one of the bent portions is located in the accommodating space. At least one bending part 1021 is located in the accommodating space formed by the bottom plate 301 and the side plates 302, and since the common distance R between the light source 20 and the first side plate 302 is 0.3-0.5 mm, the at least one bending part 1021 is arranged in the accommodating space, the position of the lower frame can be fully utilized, and the shading effect is ensured.

The embodiment of the invention also provides a display device which comprises the backlight module provided by any one of the embodiments of the invention.

Referring to fig. 8 and 9, fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention, and fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Fig. 9 shows a display device including a backlight module 00 according to any of the above embodiments of the present invention and a display panel 01 disposed opposite to the backlight module. The display panel 01 is located on the light emitting surface of the backlight module 00, and as shown by an arrow in fig. 9, light emitted from the backlight module 00 is represented, so that the backlight provided by the backlight module 00 can be incident into the display panel 01, thereby facilitating the display function.

As shown in fig. 8, the display panel 01 may include: an array substrate 012 and an opposing substrate 011 opposed to each other, and a liquid crystal 013 located between the array substrate 012 and the opposing substrate 012.

Fig. 9 illustrates an exemplary display device, and it is understood that the display device provided in the embodiment of the present invention may be other display devices having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel in each of the above embodiments, which is not repeated herein.

By the above embodiments, the backlight module and the display device provided by the invention at least achieve the following advantages,

the invention provides a backlight module and a display device, comprising: the metal frame comprises a bottom plate and side plates arranged on the periphery of the bottom plate, and the side plates and the bottom plate form an accommodating space;

the side plates comprise a first side plate, the flexible circuit board is arranged adjacent to the first side plate, and the side plates comprise hollow parts;

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A backlight module, comprising:

the first extending part comprises at least one bent part, and in the direction perpendicular to the first side plate, the projection of the bent part and the hollow part is at least partially overlapped.

2. The backlight module according to claim 1,

and at least one light shielding layer is arranged on one surface of the first extension part, which is far away from the bottom plate.

3. A backlight module according to claim 1, wherein:

the bending part comprises a first side part, a bending bottom part and a second side part, the first side part is connected with the bending bottom part, the second side part is connected with the bending bottom part, the first side part and the second side part are arranged oppositely along the direction parallel to the bottom plate, and the first side part and the light source are arranged oppositely; and the first side part and one side of part of the bent bottom part, which is far away from the bottom plate, are provided with reflecting layers.

4. A backlight module according to claim 3, wherein:

at least one layer of printing ink layer is arranged on one side of the bending bottom and the second side part, which is far away from the bottom plate.

5. A backlight module according to claim 3, wherein:

the reflecting layer is made of silver.

6. A backlight module according to claim 1, wherein:

the bending part comprises a first side part, a bending bottom and a second side part, the first side part is connected with the bending bottom, the second side part is connected with the bending bottom, and the first side part and the second side part are arranged oppositely along the direction parallel to the bottom plate; the bending part further comprises a bonding block, and the bonding block is located at the bottom of the bending part.

7. A backlight module according to claim 6, wherein:

the bonding block is formed by curing glue.

8. A backlight module according to claim 1, wherein:

in a direction perpendicular to the bottom plate, the height of the bent portion is greater than that of the light source.

9. A backlight module according to claim 1, wherein:

in the direction perpendicular to the first side plate, the projection of the bent part covers the projection of the hollow part.

10. A backlight module according to claim 2, wherein:

the bending part comprises a first side part, a bending bottom part and a second side part, the first side part is connected with the bending bottom part, the second side part is connected with the bending bottom part, and the first side part and the second side part are oppositely arranged;

a first distance between the first side part and the second side part is D, the first distance is parallel to the direction of the bottom plate, and D is more than or equal to 0.25mm and less than or equal to 0.3 mm.

11. A backlight module according to claim 1, wherein:

at least one bent part is positioned in the accommodating space.

12. A display device, comprising the backlight module according to claims 1-11 and a display panel disposed opposite to the backlight module.