CN208126071U - Backlight module and display device - Google Patents

Abstract

The utility model relates to a backlight module and a display device, the display device comprises a backlight module and a display panel arranged in front of the backlight module, the backlight module comprises a back cover, a light guide plate arranged in the back cover, a light strip and at least one optical film, the light strip is provided with a plurality of positioning columns which are convexly extended towards the direction of the optical film on a circuit substrate which is provided with a plurality of light-emitting components, the side edge of the optical film is provided with a plurality of positioning holes, the optical film is respectively aligned and penetrated by the positioning columns of the light strip through the plurality of positioning holes, therefore, the optical film is directly supported and positioned by the light strip fixed in the back cover through the plurality of positioning columns without being supported by the periphery of the back cover, and the periphery of the optical film sheet can be used for providing a bonding part of the display panel, so that the backlight module effectively reduces the frame width of the back cover and the whole thickness of the backlight module, and further reduces the product thickness of the display equipment.

Description

Backlight module and display device

technical field

The utility model relates to a backlight module and a display device used in flat displays such as liquid crystal displays.

Background technique

At present, flat display devices such as liquid crystal displays (LCDs) are widely used in products such as notebook computers, flat-screen TVs, tablet computers, and mobile phones. The aforementioned products such as notebook computers, flat-screen TVs, tablet computers, and mobile phones are based on the mainstream trend of product design, so how to make the flat-panel display devices in the aforementioned products thinner and narrower is an important research and development topic. .

In existing flat display devices such as liquid crystal displays (LCDs), the display panel does not have the feature of actively emitting light, so a backlight unit (BLU) needs to be used to provide the display panel with a backlight required for displaying images. Therefore, in response to the mainstream trend of thin, light and small product design, relevant industry players are also working on the research and development of structures such as thinning and narrowing the frame of the backlight module.

Generally speaking, side-illuminated backlight modules have the characteristics of thin product thickness, and are often selected for existing flat-panel display devices such as liquid crystal displays. As shown in FIG. 7 , the composition structure of the currently known side-illuminated backlight module is mainly to install a light guide plate 71, a light strip 72 and an optical film 73 in the back cover 70, wherein the light guide plate 71 and the light The strips 72 are respectively fixed on the back plate 701 of the back cover 70, and a reflective sheet 76 can be added between the light guide plate 71 and the back plate 701 of the back cover 70. The light bar 72 is located outside the light incident side of the light guide plate 71, and The light-emitting end of the bar 72 faces the light-incident side of the light guide plate 71, and the optical film 73 is arranged in front of the light-emitting surface of the light guide plate 71, and the optical film 73 is supported and fixed by the plastic frame 74 arranged in the back cover 70 and adhesive tape.

When the above-mentioned backlight module is combined with the display panel 80 to form a display device, the display panel 80 is positioned in front of the optical film 73 through the support portion 703 of the peripheral wall 702 of the back cover 70 combined with the double-sided tape 75, thus, the light strip 72 The emitted light diffuses through the total reflection inside the light guide plate 71, emits a uniform surface light source through the light-emitting surface of the light guide plate 71, and then provides performance such as brightness enhancement or uniform diffusion through the optical film 73, and provides the display panel 80 with the required display screen. beard backlight.

However, although the aforementioned backlight module can provide the display panel with the necessary backlight for picture display, however, its optical film must be glued and fixed through the plastic frame and adhesive tape arranged in the back cover, and the backlight module must also utilize the surrounding wall side of the back cover The protruding support part is combined with the double-sided tape to adhere and fix the display panel. Therefore, the backlight module is limited by the structure of the plastic frame for supporting the optical film and the display panel and the support part for adhesive positioning. Product development trends such as narrower bezels and thinner backlight modules and display devices have created design bottlenecks.

Utility model content

The technical problem to be solved by the utility model is to provide a backlight module and a display device to solve the problem that the structure of the existing backlight module and display device is difficult to reduce the frame and product thickness.

The technical solution proposed by the utility model is to provide a backlight module, which includes a back cover, a light guide plate, a light bar and at least one optical film, the light guide plate, the light bar and the optical film Installed on the back cover, where:

The light guide plate has a light exit surface, and the side of the light guide plate on the light exit surface is a light incident side;

The optical film is located in front of the light-emitting surface of the light guide plate, and the optical film has a plurality of positioning holes;

The light bar is located outside the light-incident side of the light guide plate, and the light bar includes a circuit substrate, a plurality of light-emitting components and a plurality of positioning posts arranged on the circuit substrate, and the light-emitting ends of the light-emitting components face the light guide plate On the light-incident side, a plurality of positioning posts are arranged on the circuit substrate and protrude toward the direction of the optical film, and the optical film uses the plurality of positioning holes to pass through the positioning posts of the light strip respectively. Assume.

In the above-mentioned backlight module, the back cover has a back plate and a retaining wall protruding upward from the periphery of the back plate, and the back cover forms an assembly space between the back plate and the retaining wall; the guide The light board is fixed in the assembly space of the back cover and is located in front of the back board.

In the above-mentioned backlight module, the light bar has two positioning columns, and the two positioning columns are respectively located at two ends of the circuit substrate, and one side of the optical film is a fixed side, and the fixed side The side protrudes from the light incident side of the light guide plate and is located in front of the light bar. The fixed side has two positioning holes, and is aligned and combined with the two positioning posts respectively.

In the above-mentioned backlight module, a reflection sheet is disposed between the light guide plate and the back cover.

In the above backlight module, the circuit substrate is a flexible circuit board.

In the above-mentioned backlight module, the circuit substrate of the light bar is adhered to the backplane by fixing glue.

Another technical solution proposed by the present invention is to provide a display device, which includes: a backlight module as described above; and a display panel, which is fixed in front of the optical film of the backlight module.

In the above-mentioned display device, at least one double-sided tape is provided on the periphery of the front side of the optical film at the frontmost position of the backlight module, and the double-sided tape is adhered between the display panel and the optical film at the frontmost position .

The beneficial effect that the utility model can achieve is that it mainly utilizes changing the positioning structure of the backlight module for the optical film, in which a plurality of positioning posts arranged on the circuit substrate of the light bar and a plurality of positioning columns on the sides of the optical film The alignment combination structure of the holes enables the optical film to be directly supported by the positioning column without being supported by the plastic frame in the back cover. At the same time, the peripheral edge of the optical film that can be supported and fixed provides a place for the display panel to be adhered and fixed. Compared with the existing backlight module, the backlight module of the utility model can omit the plastic frame of the back cover of the existing backlight module used to support the optical film and the supporting part extending from the front end of the peripheral retaining wall of the back cover, so the backlight can be effectively reduced. Cover the bezel width, as well as reduce the overall thickness of the backlight module.

Description of drawings

FIG. 1 is an exploded perspective view of a preferred embodiment of the backlight module of the present invention.

FIG. 2 is a partially enlarged schematic view of a preferred embodiment of the backlight module shown in FIG. 1 .

FIG. 3 is a schematic side plan view of a preferred embodiment of the backlight module shown in FIG. 1 and FIG. 2 .

FIG. 4 is a schematic side plan view of the light bar in the preferred embodiment of the backlight module shown in FIGS. 1 to 3 .

FIG. 5 is a top plan view of the light bar in the preferred embodiment of the backlight module shown in FIGS. 1 to 3 .

FIG. 6 is a schematic side plan view of a preferred embodiment of the display device of the present invention.

FIG. 7 is a schematic side view of a conventional backlight module.

Explanation of reference signs:

1: Backlight module

2: Display panel

10: Back cover 11: Back panel

12: retaining wall 13: assembly space

20: Light guide plate 21: Light-emitting surface

22: light incident side

30: light bar 31: circuit substrate

32: Lighting component 33: Positioning column

34: Fixing glue

40: Optical film 41: Fixed side

42: Positioning hole

50: reflector

60: double-sided tape

70: Back cover 701: Back plate

702: retaining wall 703: support part

71: Light guide plate 72: Light strip

73: Optical film 74: Plastic frame

75: Double-sided tape 76: Reflective sheet

80: display panel.

Detailed ways

Below, in conjunction with the accompanying drawings and preferred embodiments of the utility model, the technical means adopted by the utility model to achieve the intended purpose of the utility model will be further elaborated.

As shown in FIG. 1 , it discloses a preferred embodiment of the backlight module 1 of the present invention. The backlight module 1 includes a back cover 10 , a light guide plate 20 , a light bar 30 and at least one optical film 40 . in:

As shown in Figures 1 to 3, the back cover 10 is a component that provides assembly and protection of the light guide plate 20, the light bar 30 and the optical film 40. In this preferred embodiment, the back cover 10 has a The backboard 11 and a retaining wall 12 protruding upward from the periphery of the backboard 11 , the back cover 10 forms an assembly space 13 between the backboard 11 and the retaining wall 12 .

As shown in Figures 1 to 3, the light guide plate 20 is installed in the back cover 10, in this preferred embodiment, the light guide plate 20 is fixed in the assembly space 13 of the back cover 10, and is located in the the front of the backplane 11. The front of the light guide plate 20 is a light emitting surface 21 , and the side of the light guide plate 20 on the light emitting surface 21 is a light incident side 22 . Light can be incident from the light incident side 22 , through the total reflection inside the light guide plate 20 , and then output from the light output surface 21 to provide a uniform surface light source.

As shown in FIG. 3 , a reflective sheet 50 may be added between the back of the light guide plate 20 and the back plate 11 of the back cover 10 to reflect the light emitted from the back of the light guide plate 20 into the light guide plate 20 . The light emitting brightness of the light emitting surface 21 is improved.

As shown in FIGS. 1 to 3 , the light bar 30 is installed in the assembly space 13 of the back cover 10 , the light bar 30 is located outside the light incident side 22 of the light guide plate 20 , and is located at the ahead. The light bar 30 includes a circuit substrate 31, a plurality of light-emitting components 32 and a plurality of positioning columns 33 arranged on the circuit substrate 31, the circuit substrate 31 is a board with a circuit, and the plurality of light-emitting components 32 are selected to emit light. Diode components (Light Emitting Diode, LED), the plurality of light emitting components 32 are distributed and arranged on the circuit substrate 31, and electrically connected to the circuit substrate 31, so that the plurality of light emitting components 32 can be energized and emit light. The light emitting components 32 The light-emitting end of the light emitting end is located on the side of the light-emitting component 32 and faces the light-incident side 22 of the light guide plate 20 . A plurality of positioning posts 33 are distributed on the circuit board 31 and protrude forward.

As shown in Figure 1 and Figures 3 to 5, in this preferred embodiment, the circuit substrate 31 can be a flexible printed circuit (FPC), and the circuit substrate 31 is adhered to the back cover with a fixing glue 34 10 on the backboard 11. The light bar 30 has two positioning posts 33 , and the two positioning posts 33 are respectively located at two ends of the circuit substrate 31 .

As shown in FIGS. 1 to 3 , the optical film 40 can be a film with optical properties such as diffusion or brightness enhancement, and the optical film 40 is installed in the assembly space 13 of the back cover 10 . The optical film 40 is located in front of the light-emitting surface 21 of the light guide plate 20, and the periphery of the optical film 40 has a plurality of positioning holes 42. The positions of the positioning posts 33 correspond to each other, so that the optical film 40 is positioned through the plurality of positioning holes 42 for the positioning posts 33 of the light bar 30 respectively.

The optical film 40 can be one or more pieces. When the optical film 40 is one piece, the optical film 40 is directly supported and positioned by a plurality of positioning columns 33 of the light bar 30; as shown in Fig. 1 to Fig. 3 In the preferred embodiment shown, when there are multiple optical films 40, the multiple optical films 40 are sequentially arranged in front of the light-emitting surface 21 of the light guide plate 20, and the plurality of optical strips 30 The positioning posts 33 pass through multiple positioning holes 42 of the optical film 40 for support and positioning.

As shown in Figures 1 to 3, in this preferred embodiment, one side of the optical film 40 is a fixed side 41, and the fixed side 41 protrudes outside the light incident side 22 of the light guide plate 20, And located in front of the light bar 30, the fixed side 41 has two positioning holes 42, and the two positioning holes 42 are respectively connected with the positioning posts protruding forward from the two ends of the circuit board 31 in the light bar 30. 33 are aligned and combined, so that the optical film 40 is supported and positioned by the positioning column 33 .

When the backlight module 1 of the present invention is in use, the light emitted by the light-emitting component 32 of the light bar 30 is uniformly diffused by the total reflection inside the light guide plate 20 , or further reflected by the reflective sheet 50 on the back of the light guide plate 20 The function is to reflect the light emitted from the back of the light guide plate 20 back into the light guide plate 20, so that a uniform surface light source is emitted through the light-emitting surface 21 of the light guide plate 20, and the surface light source emitted from the light guide plate 20 is provided by the optical film 40. Performances such as brightness enhancement or uniform diffusion can improve the overall optical performance of the backlight module 1 .

As shown in Figure 6, it discloses a preferred embodiment of the display device of the present invention, the display device includes a backlight module 1 and a display panel 2, the specific structure of the backlight module 1 is as described in the preferred embodiment of the aforementioned backlight module 1 , and will not be repeated here. The display panel 2 can be a liquid crystal display panel, and the display panel 2 is arranged in front of the optical film 40 of the backlight module 1 , and the backlight module 1 provides necessary backlight for displaying images on the display panel 2 .

As shown in Figure 6, in this preferred embodiment, the backlight module 1 can also be provided with at least one double-sided adhesive tape 60 on the front edge of the front side of the optical film 40 at the frontmost position, and the double-sided adhesive tape 60 is adhered to the display. Between the panel 2 and the optical film 40 at the most front position, the display panel 2 is adhered and fixed to the front position of the backlight module 1, and the optical film 40 can also be fixed to the light bar 30 in the back cover 10 with multiple A positioning column 33 supports positioning.

It can be seen from the above description that the backlight module and display device proposed by the present invention mainly utilize the positioning structure of the backlight module for the optical film, wherein the positioning posts on the circuit board of the light strip and the side of the optical film The alignment and combination structure of multiple positioning holes on the side allows the optical film to be directly supported by the positioning column without being supported by the plastic frame in the back cover. At the same time, the peripheral edge of the optical film that can be supported and fixed provides a place for the display panel to be adhered and fixed . Compared with the existing backlight module, the backlight module of the utility model can omit the plastic frame of the back cover of the existing backlight module used to support the optical film and the supporting part extending from the front end of the peripheral retaining wall of the back cover, so the backlight can be effectively reduced. The frame width of the cover and the overall thickness of the backlight module are reduced, thereby overcoming the problem that the structure of the existing backlight module and display device is difficult to reduce the frame and product thickness.

The above descriptions are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Anyone in the field The skilled person, without departing from the scope of the technical solution of the present utility model, may use the technical content disclosed above to make some changes or modify the equivalent embodiments with equivalent changes, but if it does not deviate from the technical solution of the utility model, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (8)

1. a kind of backlight module comprising a back-cover, a light guide plate, a striation and an at least optical diaphragm, the light guide plate, the light Item and the optical diaphragm are installed in the back-cover, it is characterised in that：

The light guide plate have a light-emitting surface, and the light guide plate in the light-emitting surface side be an incident side；

The optical diaphragm is located at the front of the light-emitting surface of the light guide plate, and the optical diaphragm has multiple location holes；

The striation is located on the outside of the incident side of the light guide plate, which includes a circuit substrate, more on the circuit substrate A luminescence component and multiple positioning columns, the light luminous end of the luminescence component towards the light guide plate incident side, it is multiple described Positioning column is set to the circuit substrate and protrudes out towards the direction of the optical diaphragm, and the optical diaphragm is with multiple location hole The positioning column contraposition of the respectively striation is worn.

2. backlight module according to claim 1, which is characterized in that the back-cover has a backboard and from the backboard periphery The barricade protruded out upward, the back-cover form an assembly space between the backboard and the barricade；The light guide plate is fixed on the back In the assembly space of lid, and it is located at the front of the backboard.

3. backlight module according to claim 1, which is characterized in that the striation has two positioning columns, and two is described fixed Position column is located at the both ends of the circuit substrate, and described optical diaphragm a side is a fixed side, and the fixed side is prominent In outside the incident side of light guide plate, and be located in front of the striation, the fixed side has two location holes, and respectively with two institutes Positioning column is stated to bit combination.

4. backlight module according to any one of claim 1 to 3, which is characterized in that between the light guide plate and the back-cover Equipped with a reflector plate.

5. backlight module according to any one of claim 1 to 3, which is characterized in that the circuit substrate is a soft electricity Road plate.

6. backlight module according to claim 2, which is characterized in that the circuit substrate of the striation is attached to this to fix glue On backboard.

7. a kind of display equipment, which is characterized in that it includes：

One backlight module according to any one of claim 1 to 6；And

One display panel is fixedly arranged in front of the optical diaphragm of the backlight module.

8. display equipment according to claim 7, which is characterized in that the backlight module is located at the optical film of forefront position Piece leading flank periphery is equipped with an at least double faced adhesive tape, and the double faced adhesive tape is attached to the optics of the display panel Yu forefront position Between diaphragm.