CN210835510U

CN210835510U - Backlight module and display device

Info

Publication number: CN210835510U
Application number: CN201921402661.1U
Authority: CN
Inventors: 陆玉花
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2019-08-27
Filing date: 2019-08-27
Publication date: 2020-06-23
Anticipated expiration: 2029-08-27

Abstract

The utility model discloses a backlight module and display device belongs to liquid crystal display technical field, include by lower supreme backplate, reflector plate, light guide plate and the optics diaphragm group that sets gradually, optics diaphragm group includes multilayer optics diaphragm, is located the outside extension in at least both sides of the optics diaphragm of the superiors at least and forms the extension, the extension cladding in corresponding light guide plate with the side of reflector plate. The utility model discloses an extension bending type becomes domes, the side of light guide plate and reflector plate is located the domes, thereby can make the marginal reflection's of light guide plate and optical film light after the diffuse reflection through the domes, light is more dispersed, can reduce the intensity of backlight unit edge light leakage, thereby reduce the luminance of the light that forms on display panel effectively, compare with prior art, can save pasting of mouth word glue, and help the narrowing design of display device's frame.

Description

Backlight module and display device

Technical Field

The utility model relates to a liquid crystal display technology field especially relates to a backlight module and display device.

Background

With the continuous development of technology, the display volume needs to be light and thin, and the traditional Cathode Ray Tube (CRT) display has a large volume and consumes much power, and is eliminated by the market. However, the liquid crystal display device has become a mainstream product in the market because of its advantages of low operating voltage, no radiation, light weight, small volume, and the like. The liquid crystal display device comprises a backlight module and a liquid crystal display panel, wherein the liquid crystal display panel does not emit light, a light source is provided by the backlight module, and the liquid crystal display panel changes the orientation of liquid crystal molecules by using the change of electric field intensity clamped on the liquid crystal molecules and controls the strength of light transmission to display images.

Backlight unit among the prior art is usually by the backplate, the light source, the light guide plate, optical diaphragm etc. is constituteed, in the course of the work, optical diaphragm has certain inflation and shrink, so can leave certain clearance between optical diaphragm's edge and the backplate, optical diaphragm's marginal reflection light leads to the marginal light leak at liquid crystal display module assembly and the bright line appears, the present mode of pasting the mouth word is glued and is covered the clearance between optical diaphragm's edge and the backplate, in order to prevent the light leak, but on the one hand the mouth word is glued costsly higher, on the other hand is along with liquid crystal display module's frame constantly narrows down, the degree of difficulty of pasting that the mouth word was glued increases, and the mouth word is glued and is got into visual area easily, influence the normal display of image.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a backlight module and display device to realize reducing the light leak degree between the edge of optics diaphragm and the backplate effectively.

As the conception, the utility model adopts the technical proposal that:

a backlight module comprises a back plate, a reflector plate, a light guide plate and an optical diaphragm set which are sequentially arranged from bottom to top, and is characterized in that the optical diaphragm set comprises a plurality of layers of optical diaphragms, at least two sides of the optical diaphragm which is at least positioned at the uppermost layer extend outwards to form an extension part, and the extension part is coated on the corresponding side edges of the light guide plate and the reflector plate.

Furthermore, in the multiple layers of optical films, the three optical films located at the uppermost layer are all provided with the extension parts.

Furthermore, the extension part is bent to form an arch structure, and the cross section of the side edge of the light guide plate, which is positioned in the arch structure, is fan-shaped.

Further, the back plate comprises a back plate bottom plate, a protrusion is arranged on the back plate bottom plate in an upward protruding mode, and the reflecting sheet is arranged on the protrusion.

Furthermore, the side edge of the reflector plate corresponding to each extension part extends out of the surface of the protrusion, and one end of each extension part, which is far away from the corresponding optical membrane, extends into a gap between the reflector plate and the back plate bottom plate.

Furthermore, the back plate also comprises a plurality of back plate side plates which are arranged on the back plate bottom plate in a surrounding mode, and the plurality of back plate side plates and the back plate bottom plate form a cavity for accommodating the reflecting plate, the light guide plate and the optical diaphragm group.

Furthermore, the backlight module further comprises a backlight source, the backlight source is arranged on the back plate and is positioned at the light incident side of the light guide plate, and the extension part is not arranged at one side of the optical membrane corresponding to the light incident side.

Furthermore, at least one side of the optical film, which faces the backlight source, on the uppermost layer extends outwards to form a fixing lug, and the fixing lug is fixed on the backlight source.

In order to achieve the above object, the present application further provides a display device, including the backlight module described above.

Furthermore, the display device further comprises a display panel, wherein the display panel is arranged on the backlight module and is positioned above the optical diaphragm set.

The utility model has the advantages that:

the utility model provides a backlight unit, outwards extend through the at least both sides at the optical film piece that is located the superiors at least and set up the extension, and the extension cladding is in the side of light guide plate and reflector plate, the extension forms domes, thereby can make the marginal reflection's of light guide plate and optical film piece light after the diffuse reflection through domes, light is more dispersed, can reduce the intensity of backlight unit edge light leakage, thereby reduce the luminance of the light that forms on display panel effectively, compare with prior art, the pasting of glue of the word of the mouth can be saved, and help the narrowing design of display device's frame.

The utility model provides a display device has above-mentioned backlight unit, can reduce the intensity that backlight unit edge leaked the light-emitting to reduce the luminance at the light that display panel formed effectively.

Drawings

Fig. 1 is a cross-sectional view of a first viewing angle of a display device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a second viewing angle of a display device according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a display device according to a third embodiment of the present invention;

fig. 4 is a cross-sectional view of a display device according to a fourth embodiment of the present invention.

In the figure:

100. a display device;

10. a backlight module; 20. a display panel;

1. a back plate; 11. a backplane base; 111. a protrusion; 12. a back plate side plate; 2. a reflective sheet; 3. a light guide plate; 4. an optical film set; 41. an upper diffusion sheet; 411. an extension portion; 412. fixing the ear; 42. a brightness enhancement film; 43. a lower diffusion sheet; 5. a backlight source; 51. a circuit board; 511. an insertion block; 52. an LED lamp.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

Fig. 1 is a cross-sectional view of a display device 100 according to the present embodiment from a first viewing angle. As shown in fig. 1, the present embodiment provides a display device 100, which includes a backlight module 10 and a display panel 20, wherein the backlight module 10 is configured to provide a backlight 5 for the display panel 20 and uniformly illuminate the display panel 20, and the display panel 20 is disposed on the backlight module 10 and configured to display a picture.

The embodiment also provides a backlight module 10, and the backlight module 10 includes a back plate 1 and an optical assembly. The backboard 1 comprises a backboard bottom plate 11 and four backboard side plates 12 vertically enclosing four sides of the backboard bottom plate 11. The optical assembly is located in a cavity formed by the back plate bottom plate 11 and the four back plate side plates 12, and specifically, the optical assembly comprises a reflecting plate 2, a light guide plate 3 and an optical diaphragm group 4 which are sequentially stacked on the back plate bottom plate 11 from bottom to top, the optical diaphragm group 4 comprises four optical diaphragms, namely an upper diffusion sheet 41, a brightness enhancement sheet 42 and a lower diffusion sheet 43 which are sequentially stacked from top to bottom, and the brightness enhancement sheet 42 is provided with two brightness enhancement sheets. Further, a backlight 5 is provided on the light incident side of the light guide plate 3.

Specifically, one of the back plate side plates 12 is bent inward to form a lampshade, the backlight 5 is disposed on the back plate side plate 12 and located in the lampshade, in this embodiment, the backlight 5 is a light bar, the light bar includes a circuit board 51 and a plurality of LED lamps 52 disposed on the circuit board 51, and the plurality of LED lamps 52 are disposed at intervals. Set up lamp strip 51 in the lamp shade, can play the effect that prevents the light leak, improve the utilization ratio to light.

In addition, in order to enhance the structural strength of the backboard 1, the backboard bottom plate 11 is provided with a protrusion 111 protruding upwards, that is, a part of the area of the backboard bottom plate 11 is bent upwards to form the protrusion 111, and a groove is formed below the backboard bottom plate 11, and the reflective sheet 2 is provided on the protrusion 111. In order to save cost and shorten the production time for assembling parts, it is preferable that the backboard side panel 12 and the backboard base panel 11 constituting the backboard 1 are integrally formed.

In the above optical film group 4, at least two sides of the optical film at least located at the uppermost layer extend outward to form the extension portion 411, the extension portion 411 is wrapped at the side edges of the light guide plate 3 and the reflective sheet 2, in this embodiment, one end of the extension portion 411 far away from the corresponding optical film may be adhered to the lower surface of the reflective sheet 2 by an adhesive tape or glue. The side edge of the reflector plate 2 corresponding to each extending portion 411 extends out of the upper surface of the protrusion 111, that is, a gap exists between the reflector plate 2 and the back plate bottom plate 11, and one end of the extending portion 411, which is far away from the corresponding optical film, is located in the gap between the reflector plate 2 and the back plate bottom plate 11, so that the optical assembly can stably exist in the cavity of the back plate 1. In this embodiment, the length of the extension portion 411 below the reflector plate 2 is 5mm to 10mm, which not only facilitates the fixing of the extension portion 411, but also completely covers the end of the reflector plate 2 in the arch structure.

For convenience of description, an edge of each optical film located on the same side as the light incident side of the light guide plate 3 is referred to as a first side edge, another edge opposite to the first side edge is referred to as a second side edge, and two side edges connected between the first side edge and the second side edge are referred to as third side edges. Specifically, in the present embodiment, the extension portions 411 extend outward from the two third side edges of the upper diffusion sheet 41 at the uppermost layer, and the two extension portions 411 are bent downward to cover the side edges of the light guide plate 3 and the reflection sheet 2. The first side of the upper diffusion sheet 41 is not provided with the extension 411, that is, the light incident side of the light guide plate 3 is not covered by the extension 411, so that the light emitted from the backlight 5 is not affected to enter the light guide plate 3.

Through set up extension 411 on last diffusion sheet 41, and extension 411 is the side of domes cladding in light guide plate 3 and reflector plate 2, thereby can make light guide plate 3, the light that adds lustre to 42 and diffusion piece 43's edge reflection down after the diffuse reflection of domes, light is more dispersed, can reduce backlight unit 10 edge intensity of leaking light, thereby reduce the luminance of the light that forms at display panel 20 effectively, compare with prior art, can save the pasting of mouth word glue, and help the narrowing design of display device 100's frame. Specifically, when the extension portion 411 is not provided in the upper diffusion sheet 41, the side surfaces of the upper diffusion sheet 41, the brightness enhancement sheet 42 and the lower diffusion sheet 43 are all flat, and light rays irradiated in parallel to the flat surfaces may still be parallel after being reflected and refracted, which results in that the edge of each optical film has a certain brightness, and bright lines may appear on the display panel 20 when the brightness is greater, whereas when the brightness is greater, the extension portion 411 is provided in the upper diffusion sheet 41, the extension portion 411 forms an arch structure, and the emission angle and the refraction angle of the side surfaces irradiated in parallel to the arch structure are almost different, so that the distribution of the light rays reflected or refracted by the arch structure is more dispersed, and thus the brightness of the side edges of the optical films is reduced, so that the brightness of the bright lines formed on the display panel 20 is small enough to.

In order to further reduce the intensity of the light leaking from the edge of the backlight module 10, the light guide plate 3 has a fan-shaped cross section in the arched structure formed by the extending portion 411. Specifically, in the present embodiment, the angle of the fan shape is 180 °, that is, semicircular. Set up to fan-shaped through the cross section with the side of light guide plate 3, can carry out diffuse reflection to the light that jets out through the side of light guide plate 3 for light disperses more, and with above-mentioned domes combined action, makes the light that jets out by the edge of light guide plate 3 and optical film disperse more, thereby can reduce backlight unit 10 edge effectively and leak the intensity of light, reduces the luminance that forms light on display panel 20. Specifically, when the side surface of the light guide plate 3 is a plane, the parallel light beams may still be parallel to each other after being reflected by the plane, and after being reflected by the sector, the distribution of the reflected light beams of the parallel light beams may be more dispersed due to the difference of the reflection angles, so that the brightness of the side of the light guide plate 3 can be reduced.

In order to improve the stability of the upper diffusion sheet 41, the upper diffusion sheet 41 is provided with fixing lugs 412 extending outwards at the first side edge, and the fixing lugs 412 are fixed on the backlight 5. Fig. 2 is a cross-sectional view of the display device 100 according to the present embodiment from a second viewing angle. Specifically, as shown in fig. 2, in the present embodiment, the fixing lugs 412 are perpendicular to the upper diffusion sheet 41, that is, the upper diffusion sheet 41 is bent at the first side to form the fixing lugs 412 at the side of the back plate bottom plate 11, the fixing lugs 412 are provided with a clamping hole at a position corresponding to each LED lamp 52, and each clamping hole is sleeved on the corresponding LED lamp 52, so as to fix the upper diffusion sheet 41, improve the stability of the upper diffusion sheet 41, and prevent the upper diffusion sheet 41 from shifting when being vibrated to affect the normal operation. Of course, in other embodiments, the brightness enhancement film 42 and the lower diffusion film 43 may also be provided with the fixing lugs 412, and the fixing is realized by sleeving the corresponding LED lamps 52 through the fastening holes provided on the fixing lugs 412.

In summary, in the backlight module 10 provided in this embodiment, the extending portions 411 are disposed on two third side edges of the upper diffusion sheet 41 on the uppermost layer and extend outward, the extending portions 411 are wrapped on the side edges of the light guide plate 3 and the reflection sheet 2, and one end of the extending portion 411, which is far away from the upper diffusion sheet 41, is located below the reflection sheet 2, and the extending portions 411 form an arch structure, so that light reflected by the edges of the light guide plate 3 and the optical film is diffused by the arch structure, the light is more dispersed, the intensity of light leaking from the edge of the backlight module 10 can be reduced, and the brightness of light formed on the display panel 20 is effectively reduced.

The display device 100 provided by the embodiment has the backlight module 10, and can reduce the intensity of light leaking from the edge of the backlight module 10, thereby effectively reducing the brightness of light formed on the display panel 20.

Example two

The structure of the backlight module 10 provided in this embodiment is substantially the same as that of the backlight module 10 in the first embodiment, except that: the second side edge and the two third side edges of the upper diffusion sheet 41 are provided with extension portions 411 in an outward extending mode, each extension portion 411 covers the corresponding side edges of the light guide plate 3 and the reflection sheet 2, light reflected by other side edges of the light guide plate 3 except the light incident side and other side edges of the first side edge of the optical film can be subjected to diffuse reflection, distribution of light is made to be more dispersed, and therefore the intensity of light leaking out of other side edges of the backlight module 10 except the side edge provided with the light bar is reduced.

EXAMPLE III

Fig. 3 is a cross-sectional view of the display device 100 provided in this embodiment. As shown in fig. 3, the backlight module 10 provided in this embodiment has substantially the same structure as the backlight module 10 in the first embodiment, except that: in the optical film group 4, the three optical films at the uppermost layer are all provided with the extending portions 411, that is, the upper diffusion sheet 41 and the two light enhancement sheets 42 are respectively provided with the extending portions 411 at two third sides thereof, each extending portion 411 covers the side of the corresponding light guide plate 3 and the corresponding reflection sheet 2, and the arched structure formed by the upper diffusion sheet 41 and the two light enhancement sheets 42 further increases the diffuse reflection degree of the light reflected by the edges of the light guide plate 3 and the lower diffusion sheet 43, so that the distribution of the light is more dispersed.

Of course, in other embodiments, the extension portions 411 may be provided on two third side edges of the upper diffusion sheet 41 and one of the brightness enhancement sheets 42, or the extension portions 411 may be provided on two third side edges of all the four optical film sheets.

In addition, in other embodiments, the upper diffusion sheet 41 and the two brightness enhancement sheets 42 may be provided with extending portions 411 extending outward from the respective two third side edges and the second side edges, and each extending portion 411 covers the corresponding side edge of the light guide plate 3 and the corresponding side edge of the reflection sheet 2.

Example four

Fig. 4 is a cross-sectional view of the display device 100 provided in this embodiment. As shown in fig. 4, the backlight module 10 provided in this embodiment has substantially the same structure as the backlight module 10 in the first embodiment, except that: the upper diffusion sheet 41 is provided with a fixing lug 412 extending outwards from the first side, the fixing lug 412 is provided with an insertion hole in a clamping manner, and the top of the circuit board 51 is provided with an insertion block 511 protruding upwards and capable of being inserted into the insertion hole. The fixing of the upper diffusion sheet 41 is realized by inserting the insertion blocks 511 on the circuit board 51 into the insertion holes of the fixing lugs 412, so that the stability of the upper diffusion sheet 41 is improved, and the influence of displacement generated when the upper diffusion sheet 41 is vibrated on normal operation is avoided. Of course, in other embodiments, the brightness enhancement film 42 and the lower diffusion film 43 can be fixed in the above-mentioned manner.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides a backlight module, includes by lower supreme backplate (1), reflector plate (2), light guide plate (3) and the optics diaphragm group (4) that set gradually, its characterized in that, optics diaphragm group (4) include multilayer optics diaphragm, are located the superiorly at least the outside extension in both sides of optics diaphragm forms extension (411), extension (411) cladding in corresponding light guide plate (3) with the side of reflector plate (2).

2. The backlight module according to claim 1, wherein the extension portions (411) are disposed on three optical films located at the uppermost layer among the plurality of optical films.

3. The backlight module according to claim 1, wherein the extension portion (411) is curved to form an arch, and the light guide plate (3) has a fan-shaped cross section at the side inside the arch.

4. The backlight module according to claim 1, wherein the back plate (1) comprises a back plate bottom plate (11), the back plate bottom plate (11) is upwardly protruded with a protrusion (111), and the reflective sheet (2) is disposed on the protrusion (111).

5. The backlight module according to claim 4, wherein the side of the reflector sheet (2) corresponding to each of the extensions (411) extends out of the surface of the protrusion (111), and one end of the extension (411) away from the corresponding optical film extends into the gap between the reflector sheet (2) and the backplane (11).

6. The backlight module according to claim 5, wherein the back plate (1) further comprises a plurality of back plate side plates (12) surrounding the back plate bottom plate (11), and the plurality of back plate side plates (12) and the back plate bottom plate (11) form a cavity for accommodating the reflective sheet (2), the light guide plate (3) and the optical film group (4).

7. The backlight module according to claim 1, wherein the backlight module (10) further comprises a backlight source (5), the backlight source (5) is disposed on the back plate (1) and located at the light incident side of the light guide plate (3), and the extension portion (411) is not disposed at a side of the optical film corresponding to the light incident side.

8. The backlight module according to claim 7, wherein at least the uppermost optical film is provided with a fixing lug (412) extending outward from a side of the optical film facing the backlight source (5), and the fixing lug (412) is fixed on the backlight source (5).

9. A display device comprising a backlight module according to any one of claims 1 to 8.

10. The display device of claim 9, the display device (100) further comprising a display panel (20), the display panel (20) being disposed on the backlight module (10) and above the optical film set (4).