TW202238039A - Backlight module and display device - Google Patents

Abstract

A display device includes a backlight module and a display panel. The backlight module includes a back plate, a circuit substrate, a light guide plate, a plurality of light-emitting elements and a reflective sheet. The back plate includes a body, a side wall and an extension plate. The body has a bearing surface, and the side wall is disposed on the bearing surface. The extension plate is connected to the side wall, and the extension plate extends away from the body in a direction parallel to the bearing surface. The circuit substrate is disposed on the bearing surface. The light guide plate is disposed on the circuit substrate and has a light incident surface and a light exit surface. The plurality of light-emitting elements are disposed on the circuit substrate. The plurality of light-emitting elements are located beside the light incident surface and adjacent to the side wall. The reflective sheet has a fixing portion and a reflecting portion. The fixing portion is disposed on the extension plate. The reflecting portion covers the plurality of light-emitting elements and part of the light exit surface. The display panel is disposed on a light emitting side of the light source module.

Description

Backlight module and display device

The present invention relates to a backlight module, and in particular to a backlight module which can be used in a display device and a display device using the backlight module.

The liquid crystal display device includes a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not emit light, it is necessary to rely on the backlight module to provide display light to the liquid crystal display panel. Therefore, the main function of the backlight module is to provide a display light source with high luminance and high uniformity.

Traditionally, backlight modules can be divided into side-type backlight modules and direct-type backlight modules. Generally speaking, the side of the side-type backlight module with light-emitting diodes (LEDs) is designed to bend the back plate toward the light-emitting diodes, which is a known lampshade, and affixed The reflective sheet enables the light leakage at the edge of the backlight module to be reflected back into the light guide plate to improve light utilization.

However, when assembling the backlight module, it is necessary to use the pusher jig to assist the light-emitting diodes and reflectors to be attached to the bends of the back panel. Since the lampshade is in a semi-closed state, it is easy to cause difficult alignment during the process, which affects Overall light uniformity and display quality. In addition, the light guide plate is also likely to hit the reflective sheet during assembly, causing deformation of the reflective sheet.

This "Prior Art" section is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" may contain some prior art that does not constitute the prior art known to those with ordinary skill in the art. In addition, the content disclosed in the "prior art" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it represent that it has been known by those with ordinary knowledge in the technical field before the application of the present invention know or know.

The invention provides a backlight module with better uniformity of light output.

The invention provides a display device, which can improve the brightness uniformity of the picture.

Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above objectives or other objectives, a backlight module provided by an embodiment of the present invention includes a backplane, a circuit substrate, a light guide plate, a plurality of light emitting elements and a reflection sheet. The backboard includes a body, a side wall and an extension board. The body has a bearing surface, and the sidewall is configured on the bearing surface. The extension plate is connected to the side wall, and the extension plate extends in a direction parallel to the bearing surface and away from the main body. The circuit substrate is arranged on the carrying surface. The light guide plate is configured on the circuit substrate and has a light incident surface and a light exit surface. A plurality of light emitting elements are arranged on the circuit substrate. These light emitting elements are located beside the light incident surface and adjacent to the side wall. The reflection sheet has a fixing part and a reflection part. The fixing part is arranged on the extension board. The reflection part covers these light emitting elements and part of the light emitting surface.

In an embodiment of the present invention, the shape of the above-mentioned fixing portion corresponds to the shape of the extension plate.

In an embodiment of the present invention, the above-mentioned backlight module further includes an adhesive layer disposed between the extension plate and the reflection sheet.

In an embodiment of the present invention, the above-mentioned backlight module further includes at least one optical film disposed on the light-emitting surface and covering the reflective portion.

In an embodiment of the present invention, the above-mentioned plurality of light emitting elements are arranged along a direction parallel to the sidewall.

In an embodiment of the present invention, the above-mentioned extension board is composed of a plurality of extension sub-boards arranged at intervals, and there is a gap between each extension sub-board.

In an embodiment of the present invention, the above-mentioned side wall has a groove concave toward the bearing surface at an end away from the bearing surface, and the extension part is connected to the groove bottom of the groove.

In an embodiment of the present invention, the long side of the extension plate is connected to the side wall, and the length of the long side is smaller than the length of the side wall.

In an embodiment of the present invention, the depth of the groove is substantially the same as the thickness of the reflection sheet.

To achieve one or part or all of the above objectives or other objectives, a display device provided by an embodiment of the present invention includes a display panel and the above-mentioned backlight module. The display panel is arranged on the light emitting side of the backlight module.

In an embodiment of the present invention, the above-mentioned display panel is disposed on the extension board at a side corresponding to the extension board, and the fixing portion is located between the extension board and the display panel.

In the backlight module of the embodiment of the present invention, the extension plate of the back plate is connected to the side wall, and the extension plate extends in a direction parallel to the carrying surface and away from the main body, forming an open structure. When a plurality of light-emitting elements are arranged adjacent to the side walls, they can be directly visually adjusted and easily aligned. In addition, the fixing part of the reflective sheet can also be directly arranged on the extension plate and adjusted, which reduces the chance of impact when the light guide plate is assembled, and is also very convenient for subsequent maintenance of the light-emitting element or reflective sheet. Since a plurality of light-emitting elements and reflectors can be aligned on the light guide plate, the incidence and output of the overall light are relatively uniform, so that the backlight module of the embodiment of the present invention has better light uniformity. However, since the display device of the embodiment of the present invention uses the above-mentioned backlight module, the brightness uniformity of the picture can be improved.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the attached drawings.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. FIG. 2A is a top view of the backlight module of the present invention without a reflective sheet. FIG. 2B is a top view of the backlight module of the present invention. Please refer to FIG. 1 first. The display device 1 of this embodiment includes a backlight module 10 and a display panel 20 . The backlight module 10 includes a backplane 100 , a circuit substrate 200 , a light guide plate 300 , a plurality of light emitting elements 400 and a reflection sheet 500 . The backboard 100 includes a main body 110 , a side wall 120 and an extension board 130 . The body 110 has a bearing surface 111 , and the sidewall 120 is disposed on the bearing surface 111 . The extension plate 130 is connected to the side wall 120, and the extension plate 130 extends away from the main body 110 in a direction A parallel to the bearing surface 111 (ie, parallel to the X-axis), that is, the extension plate 130 is substantially connected to the side wall 120 outside. In this embodiment, the body 110 , the side wall 120 and the extension plate 130 are integrally formed, for example, but not limited thereto. In the figure, the side wall 120 and the extension plate 130 are separated by a dotted line. The circuit substrate 200 is disposed on the carrying surface 111 . The light guide plate 300 is disposed on the circuit substrate 200 and has a light incident surface 310 , a light exit surface 320 and a bottom surface 330 . The bottom surface 330 has, for example, a plurality of diffusion microstructures 331 , and the diffusion microstructures 331 may be dots or other microstructures capable of diffusing light. A plurality of light emitting elements 400 are disposed on the circuit substrate 200 . The light emitting elements 400 are located beside the light incident surface 310 and adjacent to the sidewall 120 , and are suitable for emitting light L to enter the light guide plate 300 through the light incident surface 310 . The reflective sheet 500 has a fixed portion 510 and a reflective portion 520 . The fixing part 510 is disposed on the extension board 130 . The reflective part 520 covers the light emitting elements 400 and part of the light emitting surface 320 . Overall, the fixing portion 510 is disposed on the outside of the side wall 120 , and the reflection portion 520 is disposed on the inside of the side wall 120 . In the case where the extension plate 130 is parallel to the carrying surface 111 , the reflective sheet 500 can be horizontally disposed on the extension plate 130 to reduce the influence on the reflection angle of the light L. In one embodiment, the backlight module 10 further includes a reflective layer 800 disposed between the light guide plate 300 and the bearing surface 111 to reflect the light L leaked from the bottom surface 330 of the light guide plate 300 back into the light guide plate 300 . This is not the limit.

The display panel 20 is disposed on the light emitting side of the backlight module 10 . Specifically, the display panel 20 is disposed on the backlight module 10 and supported by the backplane 100 . Taking this embodiment as an example, the side of the display panel 20 corresponding to the extension plate 130 is disposed on the extension plate 130 , and the fixing portion 510 is located between the extension plate 130 and the display panel 20 . It should be noted that, in order to clearly describe the structure of the backlight module 10 in FIG. 1 , the display panel 20 is shown separately from the backlight module 10 , which does not represent the actual structure of the display device 1 .

In this embodiment, the shape of the fixing portion 510 is, for example, corresponding to the shape of the extension plate 130 , but it is not limited thereto. Taking this embodiment as an example, please refer to FIG. 2A and FIG. 2B , the long side 131 of the extension plate 130 (as shown by the dotted line in FIG. 2A ) is connected to the side wall 120, and the length H1 of the long side 131 is, for example, smaller than the length H2 of the side wall 120, The corners of the extension plate 130 and the side wall 120 form gaps. After the reflective sheet 500 is disposed, since the shape of the fixed portion 510 corresponds to the shape of the extension plate 130 , the length of the fixed portion 510 is, for example, shorter than the length of the reflective portion 520 (as shown in FIG. 2B ). FIG. 2A and FIG. 2B are only one arrangement, and the present invention does not particularly limit the length H1 of the long side 131 of the extension plate 130 . In other embodiments, the shape of the fixing portion 510 may not correspond to the shape of the extension plate 130 , for example.

The light emitting element 400 is, for example, a light emitting diode (LED), but not limited thereto. In FIG. 2A , four light emitting elements 400 are taken as an example, but the present invention does not particularly limit the number of light emitting elements 400 . The light emitting element 400 may also be, for example, a single strip lamp, and the present invention does not limit the type of the light emitting element 400 . In this embodiment, for example, a plurality of light emitting elements 400 are arranged along the direction B parallel to the side wall 120 (that is, parallel to the Y axis). It is arranged parallel to the direction B to ensure that the emitted light L can evenly enter the light guide plate 300 .

Please refer to FIG. 1 again, the circuit substrate 200 can be, for example, a hard board or a flexible board, and is used to carry a plurality of light emitting elements 400 , and the circuit substrate 200 drives the plurality of light emitting elements 400 to emit light. The rigid board is, for example, a metal core printed circuit board (MCPCB) or a copper foil substrate (such as an FR4 substrate). In addition, the side of the circuit substrate 200 facing the light guide plate 300 may be provided with a highly reflective white paint coating (not shown), so as to reflect the light L leaked from the bottom surface 330 of the light guide plate 300 back into the light guide plate 300 , But not limited to this.

The backlight module 10 of this embodiment further includes, for example, an optical film set 600 disposed on the light emitting surface 320 . The optical film set 600 includes at least one optical film. The at least one optical film of the optical film set 600 is, for example, a polarizing brightness enhancement film, a diffusion film, a film or a composite film, but not limited thereto. The present invention does not limit the quantity of at least one optical film, which can be one or more. In this embodiment, three optical films 610 , 620 , 630 are taken as an example and stacked on the light guide plate 300 in sequence. In addition, according to the different functions of the optical films, different types of optical films 610, 620, 630 can be selected respectively. At least one of the optical films in the optical film group 600 covers the reflective portion 520 , for example. In FIG. 1 , the optical film 630 covers the reflective portion 520 as an example, but it is not limited thereto. Under this design, the light L leaked from the edge of the reflective sheet 500 can also enter the optical film 630 , reducing the phenomenon of light leakage at the edge of the screen and achieving the effect of uniform light output.

In this embodiment, the backlight module 10 further includes, for example, an adhesive layer 700 disposed between the extension plate 130 and the reflection sheet 500 . The adhesive layer 700 is, for example, adhesive tape or glue, suitable for fixing the reflective sheet 500 on the extension plate 130 to prevent the suspended part (reflective portion 520 ) of the reflective sheet 500 from falling off from the extension plate 130 due to excessive weight. The adhesive layer 700 is, for example, an integral non-segmented adhesive layer, but not limited thereto. In other embodiments, the configuration of the adhesive layer 700 can be adjusted according to design requirements.

In the backlight module 10 of this embodiment, the extension plate 130 of the backplane 100 is connected to the side wall 120 , and the extension plate 130 extends away from the main body 110 in a direction A parallel to the carrying surface 111 , forming an open structure. When disposing a plurality of light emitting elements 400 adjacent to the side wall 120 , it can be directly adjusted visually and is easy to align. In addition, the fixing portion 510 of the reflective sheet 500 can also be directly arranged on the extension plate 130 and adjusted, which reduces the probability of collision when the light guide plate 300 is assembled, and is also very convenient for subsequent maintenance of the light-emitting element 400 or the reflective sheet 500 . Since the plurality of light-emitting elements 400 and the reflective sheet 500 can be aligned on the light guide plate 300 , the incidence and output of the overall light L are relatively uniform, so that the backlight module 10 of this embodiment has better uniformity of light output. However, since the display device 1 of this embodiment uses the above-mentioned backlight module 10 , the brightness uniformity of the screen can be improved.

FIG. 3 is a schematic view of one side of the backlight module of the present invention having an extension plate. Please refer to FIG. 1 to FIG. 3 , in this embodiment, the backlight module 10 also has the following design, for example: the side wall 120 has a groove 121 (not shown in FIG. bearing surface 111), but not limited thereto. The extension portion 130 is, for example, connected to the groove bottom of the groove 121 and extends away from the main body 110 . Specifically, the reflective sheet 500 passes through the groove 121 when it is configured. In FIG. 3 , in order to clearly illustrate the adhesive layer 700 , its thickness is increased when drawing, but it is not equal to the actual ratio, and the thickness of the adhesive layer 700 should be negligibly small. Therefore, the depth of the groove 121 is substantially the same as the thickness of the reflective sheet 500 , so that the top surface of the reflective sheet 500 can be substantially coplanar with the top surface of the sidewall 120 . The effect of this design is that when the display panel 20 is placed, if the side where the reflective sheet 500 is disposed is more convex, most of the weight of the display panel 20 will be pressed on the reflective sheet 500, which may cause damage to the reflective sheet 500. Therefore, The reflection sheet 500 is disposed in the groove 121 , and its top surface can be substantially coplanar with the top surface of the sidewall 120 , so that the weight of the display panel 20 can be evenly distributed to other sides of the backlight module 10 . If the thickness of the reflective sheet 500 is smaller than the depth of the groove 121 , the thickness of the reflective sheet 500 can also be increased, or a plurality of reflective sheets 500 can be arranged for adjustment. When the corner between the extension plate 130 and the side wall 120 has a gap (as shown in FIG. 2A and FIG. 2B ), other components such as a plastic frame or the back plate 100 may be used to assist in supporting the display panel 20 later. The above-mentioned design is only one of many embodiments of the present invention, and the present invention does not limit the configuration of the reflecting sheet 500 .

FIG. 4 is a top view of a backlight module without a reflective sheet according to another embodiment of the present invention. Please refer to FIG. 4 , the backplane 100a of this embodiment is similar to the above-mentioned backplane 100 in structure and advantages, the only difference is that in the backplane 100a of this embodiment, the extension board 130a is formed by a plurality of extension sub-boards 132 arranged at intervals. Composition, and there is a gap G between each extension sub-board 132 . Under the design of this embodiment, the material cost of the back plate 100a can be reduced, and good stability can also be provided when the reflection sheet is arranged.

To sum up, in the backlight module of the embodiment of the present invention, the extension plate of the back plate is connected to the side wall, and the extension plate extends away from the main body in a direction parallel to the carrying surface, forming an open structure. When a plurality of light-emitting elements are arranged adjacent to the side walls, they can be directly visually adjusted and easily aligned. In addition, the fixing part of the reflective sheet can also be directly arranged on the extension plate and adjusted, which reduces the chance of impact when the light guide plate is assembled, and is also very convenient for subsequent maintenance of the light-emitting element or reflective sheet. Since a plurality of light-emitting elements and reflectors can be aligned on the light guide plate, the incidence and output of the overall light are relatively uniform, so that the backlight module of the embodiment of the present invention has better light uniformity. However, since the display device of the embodiment of the present invention uses the above-mentioned backlight module, the brightness uniformity of the picture can be improved.

But what is described above is only a preferred embodiment of the present invention, and should not limit the scope of implementation of the present invention with this, that is, all simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the description of the invention, All still belong to the scope covered by the patent of the present invention. In addition, any embodiment or scope of claims of the present invention does not necessarily achieve all the objectives or advantages or features disclosed in the present invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not used to limit the scope of rights of the present invention.

1: Display device 10: Backlight module 20: Display panel 100, 100a: backplane 110: Ontology 111: bearing surface 120: side wall 121: Groove 130, 130a: extension plate 131: long side 132: Extended sub-board 200: circuit substrate 300: light guide plate 310: incident surface 320: light emitting surface 330: bottom surface 331: Diffusion Microstructure 400: light emitting element 500: reflector 510: fixed part 520: reflection department 600:Optical diaphragm group 610, 620, 630: optical film 700: Adhesive layer 800: reflective layer A, B: direction G: Gap H1, H2: Length L: Light.

FIG. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention. FIG. 2A is a top view of a backlight module without a reflective sheet according to an embodiment of the present invention. FIG. 2B is a top view of a backlight module according to an embodiment of the invention. FIG. 3 is a schematic diagram of a side of a backlight module having an extension plate according to an embodiment of the present invention. FIG. 4 is a top view of a backlight module without a reflective sheet according to another embodiment of the present invention.

1: Display device

10: Backlight module

20: Display panel

100: Backplane

110: Ontology

111: bearing surface

120: side wall

130: extension board

200: circuit substrate

300: light guide plate

310: incident surface

320: light emitting surface

330: bottom surface

331: Diffusion Microstructure

400: light emitting element

500: reflector

510: fixed part

520: reflection department

600:Optical diaphragm group

610, 620, 630: optical film

700: Adhesive layer

800: reflective layer

A: Direction

L: light

Claims (11)

A backlight module, including: A backboard, including a body, a side wall and an extension plate, the body has a load-bearing surface, the side wall is arranged on the load-bearing surface, the extension plate is connected to the side wall, and the extension plate is parallel to the load-bearing surface extending in a direction away from the body; a circuit substrate configured on the carrying surface; A light guide plate is arranged on the circuit substrate and has a light incident surface and a light exit surface; a plurality of light-emitting elements arranged on the circuit substrate, the light-emitting elements are located beside the light incident surface and adjacent to the side wall; and A reflective sheet has a fixed part and a reflective part, the fixed part is arranged on the extension plate, and the reflective part covers the light-emitting elements and part of the light-emitting surface. The backlight module as claimed in claim 1, wherein the shape of the fixing portion corresponds to the shape of the extension plate. The backlight module as described in claim 1 further includes an adhesive layer disposed between the extension plate and the reflection sheet. The backlight module according to claim 1 further includes at least one optical film disposed on the light emitting surface and covering the reflective portion. The backlight module according to claim 1, wherein the light emitting elements are arranged along a direction parallel to the sidewall. The backlight module according to claim 1, wherein the extension board is composed of a plurality of extension sub-boards arranged at intervals, and there is a gap between each of the extension sub-boards. The backlight module according to claim 1, wherein the side wall has a groove concave toward the carrying surface at an end away from the carrying surface, and the extension part is connected to the groove bottom of the groove. The backlight module according to claim 7, wherein a long side of the extension plate is connected to the side wall, and the length of the long side is shorter than the length of the side wall. The backlight module according to claim 7, wherein the depth of the groove is substantially the same as the thickness of the reflective sheet. A display device, comprising: A backlight module, including: A backboard, including a body, a side wall and an extension plate, the body has a load-bearing surface, the side wall is arranged on the load-bearing surface, the extension plate is connected to the side wall, and the extension plate is parallel to the load-bearing surface extending in a direction away from the body; a circuit substrate configured on the carrying surface; A light guide plate is arranged on the circuit substrate and has a light incident surface and a light exit surface; a plurality of light-emitting elements arranged on the circuit substrate, the light-emitting elements are located beside the light incident surface and adjacent to the side wall; and A reflection sheet has a fixing part and a reflection part, the fixing part is arranged on the extension plate, and the reflection part covers the light-emitting elements and part of the light-emitting surface; and A display panel is arranged on a light emitting side of the backlight module. The display device according to claim 10, wherein the side of the display panel corresponding to the extension plate is disposed on the extension plate, and the fixing portion is located between the extension plate and the display panel.

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