CN116184556A - Backlight module and display device - Google Patents

Abstract

The invention provides a backlight module, the backlight module includes a light guide plate, a back plate and a light source assembly, the light guide plate has a first surface, a second surface and a third surface, the second surface connects the first surface and the The third surface, the first surface is opposite to the third surface, the second surface is the light incident surface of the light guide plate; the back plate has a first part, a second part and a third part connected by bending, the The light guide plate is accommodated in the back plate, the first part corresponds to the first surface, the second part corresponds to the second surface, the third part corresponds to the third surface, and the second part of the back plate corresponds to the second surface. The component is a non-planar structure, and there is a light reflection channel between the second component and the second surface; the light source component is located in the accommodation space formed between the third surface and part of the third component, and the light source component The emitted light is directed towards the second component and is reflected by the light reflection channel to enter the light incident surface of the light guide plate.

Description

Backlight module and display device

technical field

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

Background technique

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a backlight module in the prior art. As shown in Figure 1, the current backlight module 1 generally includes an LED (light-emitting diode) light source 2, a light guide plate 3, a flexible circuit board (Flexible Printed Circuit, FPC) 4, a backplane 5, a reflector 6 and an optical The diaphragm set 7 , the LED light source 2 is arranged on the flexible circuit board 4 and the flexible circuit board 4 is electrically connected to the LED light source 2 , the light guide plate 3 is located on the reflection sheet 6 , and the optical film set 7 is located on the light guide plate 3 . Usually, the backlight module 1 adopts a side-type backlight, that is, the LED light source 2 and the flexible circuit board 4 are located on the side of the light guide plate 3 , and the light emitted by the LED light source 2 is directly incident on the corresponding side of the light guide plate 3 . As shown in FIG. 1 , in the prior art, a receiving space is formed by bending the backboard 5 , so that the backboard 5 accommodates and fixes the LED light source 2 , the light guide plate 3 , the flexible circuit board 4 and the reflection sheet 6 . During the bending process of the backplane 5, since the LED light source 2 and the flexible circuit board 4 are located on the side of the light guide plate 3, it is necessary to reserve a certain space for placing the LED light source 2 and the flexible circuit board 4, that is, the side of the light guide plate 3 to the The edge of the back plate 5 has a distance D1 in a lateral direction (which can be defined as the direction in which the light guide plate 3 extends toward the edge of the side where the LED light source 2 in the backlight module 1 is located), and the distance D1 is at least The width in the direction plus the protruding width of the flexible printed circuit board 4 relative to the LED light source 2 in the aforementioned transverse direction, in FIG. Making the aforementioned distance D1 larger makes the edge area of the backlight module 1 in the prior art wider, which is not conducive to realizing a narrow frame of the display device.

At present, users have higher and higher requirements for narrow bezels of display devices. Therefore, how to reduce the width of the edge area of the backlight module to achieve narrow bezels of the display device is an urgent problem to be solved.

Contents of the invention

The invention provides a backlight module and a display device to solve the problem of wide edge area in the existing backlight module.

In order to achieve the above object, the present invention proposes a backlight module, which includes: a light guide plate, a back plate and a light source assembly, the light guide plate has a first surface, a second surface and a third surface, the second surface is connected to the first surface and the third surface, the first surface is opposite to the third surface, the second surface is the light incident surface of the light guide plate; the back plate has a first part, a second part and a third part connected by bending components, wherein the second component connects the first component and the third component, the light guide plate is accommodated in the back plate, the first component corresponds to the first surface, and the second component corresponds to the second surface , the third component corresponds to the third surface, so that the light guide plate is interposed between the first component and at least part of the third component, and at the same time, a part of the third component is formed between the third surface and the third component An accommodating space, the second part of the back plate is a non-planar structure, and there is a light reflection channel between the second part and the second surface; the light source assembly is located in the accommodating space, and the light emitted by the light source assembly The light is directed toward the second component and incident to the light incident surface of the light guide plate after being reflected by the light reflection channel.

As an optional technical solution, the backlight module further includes a reflection component, the reflection component is located in the light reflection channel between the second surface of the light guide plate and the second part of the back plate, and the light source component emits The light irradiates the reflective component and is reflected to the light guide plate by the reflective component.

As an optional technical solution, the second part of the backplane includes a connected first backplane unit and a second backplane unit, and the first backplane unit and the second backplane unit are related to the light guide plate. The third surface is symmetrical, the angle between the first backplane unit and the third surface is 45°, and the angle between the second backplane unit and the third surface is 45°.

As an optional technical solution, the third surface of the light guide plate extends through the end of the second part of the backplane away from the second surface, and the end of the second part of the backplane away from the second surface There is a protruding distance relative to the second surface, and the protruding distance is consistent with the thickness of the light guide plate.

As an optional technical solution, the reflective component is a reflective layer, and the reflective layer is located on a side of the second part of the back plate facing the second surface of the light guide plate.

As an optional technical solution, the reflection component is a reflection medium, and the reflection medium is filled in the light reflection channel.

As an optional technical solution, the third part of the backplane includes a plurality of backplane units connected, and the plurality of backplane units are adjacent to the second part of the backplane when the third part of the backplane The accommodation space is formed between one side and the third surface.

As an optional technical solution, the backlight module further includes an optical film set, a reflection sheet and a flexible circuit board, the optical film set is located on the first surface of the light guide plate, the reflection sheet is located on the light guide plate Between the third surface and the third part of the back plate, the flexible circuit board is located between the reflection sheet and the light source assembly, and the flexible circuit board is electrically connected to the light source assembly.

As an optional technical solution, the end of the flexible circuit board facing the second component does not exceed the second surface of the light guide plate.

In addition, the present invention also proposes a display device, comprising the backlight module described in any one of claims 1-9.

The present invention provides a backlight module and a display device. By arranging a light source component on the back of a light guide plate, and designing the back plate as a non-planar structure and providing a reflective component inside the back plate, the light emitted from the light source component can pass through the The reflection component reaches the light incident surface of the light guide plate, thereby shortening the space width originally reserved for the light source component by the backplane in the side-type backlight module, and reducing the width of the edge area of the side-type backlight module, thereby realizing The narrow frame of the display device is improved, and the utilization rate of light is improved by using the reflection component.

Description of drawings

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic structural diagram of a backlight module in the prior art;

2 is a schematic structural view of the backlight module according to the first embodiment of the present invention;

FIG. 3 is a schematic structural diagram of the backlight module according to the second embodiment of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

Please refer to FIG. 2 . FIG. 2 is a schematic structural diagram of the backlight module according to the first embodiment of the present invention. The present invention provides a backlight module 100, which includes a light guide plate 10, a back plate 20, a light source assembly 30, and a reflection assembly 40. The light guide plate 10 has a first surface 11, a second surface 12, and a third surface 13. The second surface 12 connects the first surface 11 and the third surface 13, the first surface 11 and the third surface 13 are arranged oppositely, the second surface 12 is the light incident surface of the light guide plate 10; the back plate 20 has a first part 21, The second part 22 and the third part 23, wherein the second part 22 connects the first part 21 and the third part 23, the light guide plate 10 is accommodated in the backplane 20, the first part 21 corresponds to the first surface 11, and the second The part 22 corresponds to the second surface 12, and the third part 23 corresponds to the third surface 13, so that the light guide plate 10 is interposed between the first part 21 and at least part of the third part 23, and the third part of the light guide plate 10 A receiving space is formed between the surface 13 and part of the third component 23 . The second part 22 of the backplane 20 is a non-planar structure, and there is a light reflection channel between the second part 22 and the second surface 12 of the light guide plate 10; the light source assembly 30 is located in the aforementioned accommodation space, and the light emitted by the light source assembly 30 The light is directed toward the second component 22 and is reflected by the light reflection channel, then enters the second surface 12 of the light guide plate 10 and then enters the interior of the light guide plate 10 .

As shown in FIG. 2 , in this embodiment, the reflection assembly 40 is located in the light reflection channel between the second part 22 of the backplane 20 and the second surface 12 of the light guide plate 10, and the light emitted by the light source assembly 30 hits the reflection assembly. 40 and then reflected by the reflection component 40 to the second surface 12 of the light guide plate 10 and then enters the interior of the light guide plate 10 (the light path is shown by the thick solid line in the figure).

In this embodiment, the second part 22 of the backplane 20 includes a connected first backplane unit 221 and a second backplane unit 222. Shown) through the end of the second part 22 of the back plate 20 away from the second surface 12, further, the first back plate unit 221 and the second back plate unit 222 can have a symmetrical structure with respect to the third surface 13, the first back plate The angle between the unit 221 and the third surface 13 is 45°, and the angle between the second backplane unit 222 and the third surface 13 is also 45°, so that the second part 22 of the backplane 20 is far away from the second surface of the light guide plate 10 The protruding distance D2 of the end portion of 12 relative to the second surface 12 is consistent with the thickness of the light guide plate 10 .

In the present invention, the light source assembly 30 is arranged on the back of the light guide plate 10, and the second part 22 in the backplane 20 is arranged in a non-planar symmetrical structure, and the first backplane unit 221 and the second backplane of the second part 22 A reflection assembly 40 is provided in the light reflection channel between the unit 222 and the light incident surface of the light guide plate 10, so that the light emitted by the light source assembly 30 from the back of the light guide plate 10 can be reflected by the reflection assembly 40 and reach the entrance of the light guide plate 10. The smooth surface (that is, the second surface 12), thereby shortening the width of the space originally reserved for the light source assembly 30 in the backplane 20, reducing the width of the edge area of the backlight module 100, thereby realizing a narrow frame of the display device, At the same time, the light utilization rate is improved by using the reflective assembly 40 .

In this embodiment, as shown in FIG. 2, the third part 23 of the backplane 20 includes a connected third backplane unit 231, a fourth backplane unit 232, and a fifth backplane unit 233, and the third backplane unit One end of 231 is connected to the second backlight unit 222 of the second component 22 , and the fourth backlight unit 232 is connected to the other end of the third backlight unit 231 after extending from the thickness direction of the light guide plate 10 . The third backplane unit 231 and the fourth backplane unit 232 form an accommodating space on the side of the third part 23 of the backplane 20 close to the second part 22 of the backplane 20, and the light source assembly 30 is located in the accommodating space. The backplane unit 233 sandwiches and supports the rest of the area.

In practical applications, the backlight module 100 further includes an optical film set 50 , a reflection sheet 60 and a flexible circuit board 70 . The optical film group 50 is located on the first surface 11 of the light guide plate 10, the reflective sheet 60 is located between the third surface 13 of the light guide plate 10 and the third part 23 of the back plate 20, and the flexible circuit board 70 is located between the reflective sheet 60 and the flexible Between the circuit boards 70 , the flexible circuit board 70 is electrically connected to the light source assembly 30 to provide electrical signals to the light source assembly 30 , and the end of the flexible circuit board 70 toward the second component 22 does not exceed the second surface 12 of the light guide plate 10 In this way, the end of the flexible circuit board 70 can be prevented from affecting the light transmission of the light source assembly 30 , and at the same time, the width of the edge area of the backlight module 100 will not be increased. In this embodiment, the light source assembly 30 is an LED assembly.

It should be noted that in FIG. 2 and subsequent figures, the sizes of the light guide plate 10 and the light source assembly 30 are shown exaggeratedly. In actual operation, in some embodiments, the thickness of the light guide plate 10 is smaller than that of the light source assembly 30. width. As introduced in the background technology, in the backlight module 1 in the prior art, during the bending process of the backplane 5, it is necessary to reserve space for placing the LED light source 2 and the flexible circuit board 4, the light incident surface of the light guide plate 3 and the backlight The distance D1 between the edges of the LED light source 2 in the module 1 is at least the width of the LED light source 2 plus the protruding width of the flexible circuit board 4 relative to the LED light source 2, and the backlight module 100 in the present invention, due to the backlight The second part 22 of the board 20 is a non-planar structure, the light source assembly 30 is arranged on the back of the light guide plate 10, and the light emitted by the light source assembly 30 first enters between the second part 22 of the back plate 20 and the light incident surface of the light guide plate 10 The light reflected in the reflection channel is reflected to the light incident surface of the light guide plate 10, thus shortening the edge width of the backlight module 100 and catering to the trend of narrow bezels.

Further, in this embodiment, the second part 22 of the backplane 20 is a non-planar symmetrical structure of 45°, that is, the end of the second part 22 of the backplane 20 away from the light incident surface of the light guide plate 10 is opposite to the light incident surface. The protruding distance D2 is approximately equal to the thickness of the light guide plate 10. In this embodiment, the width of the edge area of the backlight module 100 is the protruding distance D2, which is the thickness of the light guide plate 10. Compared with the prior art, the backlight The width of the edge area of the module 100 can be reduced (D1-D2), that is, the width of the LED light source 2 in the direction in which the light guide plate 3 extends toward the edge of the side where the LED light source 2 is located in the backlight module 1 plus the flexible circuit board 4 is added here The thickness of the light guide plate 10 is subtracted from the protruding width relative to the LED light source 2 in the direction, thereby greatly reducing the width of the edge area of the backlight module 100 . Taking a common mobile phone as an example, the width of the LED light source 2 is 0.85 mm, the width of the flexible circuit board 4 protruding relative to the LED light source 2 is 0.2 mm, and the thickness of the light guide plate 10 is 0.37 mm, that is, the width of the edge area of the backlight module 100 can be With a reduction of 0.68mm, the width of the edge area has been reduced by almost 65%.

In this embodiment, the reflective component 40 is a reflective layer 41, and the reflective layer 41 is located in the aforementioned light reflection channel. In one embodiment, the reflective layer 41 can be a silver layer (for example, but not limited to, coated on the surface of the second component 22 facing the light incident surface 12), but not limited thereto, any material with high reflectivity can be used . In this embodiment, the reflective component 40 is other component than the backplane 20 , in actual operation, the reflective component 40 can also be a component on the backplane 20 . For example, the backplane 20 can be a metal backplane, and the reflection component 40 can also be a surface of the metal backplane facing the light-incident surface of the light guide plate 10 , which can provide a reflection function.

Please refer to FIG. 3 . FIG. 3 is a schematic structural diagram of the backlight module according to the second embodiment of the present invention. The difference from the first embodiment is that, as shown in FIG. 3 , in this embodiment, the reflective component 40 is a reflective medium 42 , and the reflective medium 42 is filled in the aforementioned light reflection channel, and the light emitted by the light source component 30 is incident on the reflective medium 42 It is reflected by the reflective medium 42 to the light incident surface of the light guide plate 10 and then enters the interior of the light guide plate 10 (the light path is shown by the thick solid line in the figure).

In this embodiment, the second part 22' of the backplane 20 also includes a connected first backplane unit 221' and a second backplane unit 222'. The difference from the first embodiment is that in this embodiment, the second The angle between a backplane unit 221' and the second backplane unit 222' can be adjusted accordingly according to the total reflection angle of the reflection medium 42, and the structure formed by connecting the first backplane unit 221' and the second backplane unit 222' Corresponding adjustments can be made according to the shape of the reflective medium 42, and are not limited to the non-planar structure formed by the first backplane unit 221 and the second backplane unit 222 in the first embodiment, such as the first backplane unit 221' and The second backplane unit 222' may be curved or the like.

In addition, the present invention also proposes a display device, which includes the aforementioned backlight module. Specifically, the display device may include a display panel and the aforementioned backlight module, the display panel is located on the aforementioned backlight module, and the aforementioned backlight module may provide a backlight source for the display panel.

To sum up, the present invention provides a backlight module and a display device. By arranging the light source assembly on the back of the light guide plate, the back plate is designed as a non-planar structure and the inside of the back plate is provided with a reflective assembly, so that the light source assembly can be viewed from the back. The emitted light can reach the light incident surface of the light guide plate through the reflection component, thereby shortening the space width originally reserved for the light source component by the backplane in the side-type backlight module, and reducing the edge of the side-type backlight module The width of the area is wide, so that the narrow frame of the display device is realized, and the light utilization rate is improved by using the reflective component.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those of ordinary skill in the art can also make It is not possible to exhaustively list all the embodiments here, and any obvious changes or changes derived from the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims (10)

1. A backlight module, comprising:

the light guide plate is provided with a first surface, a second surface and a third surface, wherein the second surface is connected with the first surface and the third surface, the first surface and the third surface are oppositely arranged, and the second surface is a light incident surface of the light guide plate;

the back plate is provided with a first part, a second part and a third part which are connected in a bending way, wherein the second part is connected with the first part and the third part, the light guide plate is accommodated in the back plate, the first part corresponds to the first surface, the second part corresponds to the second surface, the third part corresponds to the third surface, the light guide plate is clamped between the first part and at least part of the third part, meanwhile, an accommodating space is formed between the third surface and part of the third part, the second part of the back plate is of a non-planar structure, and a light reflection channel is formed between the second part and the second surface; and

the light source component is positioned in the accommodating space, and light rays emitted by the light source component face the second component and are reflected by the light ray reflection channel and then are incident to the light incident surface of the light guide plate.

2. The backlight module according to claim 1, further comprising a reflective element disposed in the light reflection path between the second surface of the light guide plate and the second member of the back plate, wherein the light emitted from the light source element is reflected to the light guide plate by the reflective element after being incident on the reflective element.

3. The backlight module according to claim 1, wherein the second component of the back plate comprises a first back plate unit and a second back plate unit connected to each other, the first back plate unit and the second back plate unit are symmetrical with respect to the third surface of the light guide plate, an included angle between the first back plate unit and the third surface is 45 °, and an included angle between the second back plate unit and the third surface is 45 °.

4. A backlight module according to claim 3, wherein the third surface of the light guide plate extends through an end of the second member of the back plate away from the second surface, and the end of the second member of the back plate away from the second surface has a protruding distance with respect to the second surface, the protruding distance being consistent with the thickness of the light guide plate.

5. The backlight module according to claim 2, wherein the reflective component is a reflective layer, and the reflective layer is located on a side of the second portion of the back plate facing the second surface of the light guide plate.

6. The backlight module according to claim 2, wherein the reflective component is a reflective medium, and the reflective medium is filled in the light reflective channel.

7. The backlight module according to claim 1, wherein the third component of the back plate comprises a plurality of back plate units connected to form the accommodation space between a side of the third component of the back plate adjacent to the second component of the back plate and the third surface.

8. The backlight module of claim 1, further comprising an optical film set, a reflective sheet and a flexible circuit board, wherein the optical film set is disposed on the first surface of the light guide plate, the reflective sheet is disposed between the third surface of the light guide plate and the third component of the back plate, the flexible circuit board is disposed between the reflective sheet and the light source assembly, and the flexible circuit board is electrically connected with the light source assembly.

9. A backlight module according to claim 8, wherein the end of the flexible printed circuit board facing the second member does not exceed the second surface of the light guide plate.

10. A display device comprising the backlight module of any one of claims 1 to 9.

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