WO2024178758A1

WO2024178758A1 - Backlight module having tiled reflectors, and display device

Info

Publication number: WO2024178758A1
Application number: PCT/CN2023/082888
Authority: WO
Inventors: 张政德; 林家叶; 侯珮棻
Original assignee: 瑞仪光电(南京)有限公司
Priority date: 2023-03-01
Filing date: 2023-03-21
Publication date: 2024-09-06

Abstract

A backlight module having tiled reflectors (3), the backlight module including a light-emitting unit (2), a plurality of reflectors (3), and at least one fixing member (4). The light-emitting unit (2) comprises a circuit board (21) and a plurality of light-emitting members (22) arranged on the circuit board (21) at intervals. The reflectors (3) are arranged on the circuit board (21) and partially overlap. The at least one fixing member (4) is arranged at the junction where the reflectors (3) overlap, so as to clamp and position adjacent reflectors (3). Adjacent reflectors (3) mutually overlap or at least partially overlap by means of several reflective cups (31), and at least one fixing member (4) is arranged for clamping at the junction where the reflectors (3) overlap, so that the adjacent reflectors (3) can be positioned, thereby saving on the assembly time and manufacturing cost. Further provided is a display device including the backlight module.

Description

Backlight module and display device with spliced reflective sheet

This application claims the priority of Chinese patent application No. 202310195603.0 filed on March 1, 2023, and entitled “Backlight module and display with spliced reflective sheet”, all contents of which are hereby incorporated by reference into this application.

Technical Field

The invention relates to an optical device, and in particular to a backlight module and a display device with a spliced reflective sheet.

Background Art

In recent years, liquid crystal display devices have been widely used in electronic imaging products such as laptops, digital cameras, and televisions due to their light, thin, small, and low power consumption characteristics. Since liquid crystal itself does not have the property of emitting light, it needs to rely on a backlight module to provide a surface light source. Backlight modules can be roughly divided into: side-lit backlight modules and direct-lit backlight modules. Among them, direct-lit backlight modules require a longer mixing distance to achieve a uniform mixing effect, so the thickness of the direct-lit backlight module is relatively thick, which is not conducive to the production of thin display devices; while the side-lit backlight module can be used with light-emitting diodes and has the advantage of being thinner.

In order to reduce production costs and manufacturing difficulty, the internal components of larger-sized backlight modules, such as reflectors, are usually spliced into larger ones by small sizes to meet the large-size usage requirements. However, the traditional splicing method also requires the use of fixing tape for gluing, which increases material costs and assembly time.

Summary of the invention

Therefore, an object of the present invention is to provide a backlight module that can shorten the assembly time.

According to the above purpose, the present invention discloses a backlight module with a spliced reflective sheet, which includes a light-emitting unit, a plurality of reflective sheets and at least one fixing member. The light-emitting unit includes a circuit board and a spacer. A plurality of light-emitting components are placed on a circuit board. A plurality of reflective sheets are arranged on the circuit board and partially overlap. Each reflective sheet has a plurality of through holes, which are respectively used for a plurality of light-emitting components of a light-emitting unit to extend and be placed therein. At least one fixing member is arranged at the intersection of the overlapping portions of the reflective sheets to clamp and position adjacent reflective sheets.

Another technical means of the present invention is that each reflector sheet has a plurality of reflector cups arranged in a matrix, adjacent reflectors are overlapped in a manner that a plurality of reflector cups are completely overlapped, each reflector cup has a bottom wall and a surrounding wall connected to the bottom wall, perforations are respectively formed on the bottom wall of each reflector cup, and at least one fixing member is clamped on the surrounding walls of the reflector cups of two adjacent reflectors.

Another technical means of the present invention is that at least one fixing member has a plurality of clamping parts, and the overlapping boundary position of the reflective sheet is clamped between two adjacent clamping parts.

Another technical means of the present invention is that multiple clamping parts of at least one fixing member extend into different reflective cups, wherein a part of the clamping parts extend into overlapping reflective cups and another part of the clamping parts extend into non-overlapping reflective cups.

Another technical means of the present invention is that the overlapping reflective cups are arranged along one of the first axis or the second axis, and the multiple clamping parts of at least one fixing member are arranged at intervals along the other of the first axis or the second axis, and the first axis and the second axis are not parallel.

Another technical means of the present invention is that the overlapping reflective cups are arranged along one of the first axis or the second axis, and the multiple clamping parts of at least one fixing member are arranged at intervals along a third axis, and the third axis is not parallel to and perpendicular to the first axis and the second axis.

Another technical means of the present invention is that at least one fixing member also has a column portion extending downward from the clamping portion, each reflector also has at least one positioning hole located at the junction of the reflector cup, and the column portion of at least one fixing member is inserted into the positioning hole.

Another technical means of the present invention is that the circuit board of the light-emitting unit has at least one through hole corresponding to the positioning hole of the reflector, and the column portion of at least one fixing member is inserted into the positioning hole of the reflector and at least one through hole of the circuit board.

Another technical means of the present invention is that at least one fixing member also has a top supporting portion extending upward from the clamping portion, and the backlight module with a spliced reflective sheet also includes at least one optical film arranged on the reflective sheet, and the top supporting portion of at least one fixing member is used to support at least one optical film.

Another technical means of the present invention is that at least one fixing member is made of a light-transmitting material.

Another technical means of the present invention is that the backlight module with the spliced reflective sheet also includes The bottom frame is used to carry the light-emitting unit, wherein at least one fixing member passes through the circuit board of the light-emitting unit and is fixed on the bottom frame.

Another technical means of the present invention is that the surrounding wall of the reflective cup located at the lower layer is completely covered by the surrounding wall of the reflective cup located at the upper layer.

Another technical means of the present invention is that the top edge of the surrounding wall of each reflective cup is surrounded into a polygon, and at least one fixing member is disposed on one edge or one corner of the surrounding wall.

The present invention discloses another backlight module with a spliced reflective sheet, comprising a light-emitting unit, a plurality of reflective sheets and at least one fixing member. The light-emitting unit comprises a circuit board and a plurality of light-emitting members spaced apart on the circuit board. The reflective sheet is arranged on the circuit board. Each reflective sheet has a plurality of through holes, which are respectively used for the plurality of light-emitting members of the light-emitting unit to extend therein, each reflective sheet can be divided into an overlapping area and a non-overlapping area connected to the overlapping area, and the overlapping areas of adjacent reflective sheets are stacked up and down. At least one fixing member has a plurality of clamping parts, a part of which is extended into the overlapping area, and another part of which is extended into the non-overlapping area.

Another object of the present invention is to provide a display device, comprising a backlight module with a spliced reflective sheet as described above, and a display panel disposed on the backlight module.

The effect of the present invention is that adjacent reflective sheets are overlapped or at least partially overlapped with each other by a plurality of reflective cups, and at least one fixing member is arranged at the overlapping intersection of the reflective sheets for clamping, so that the adjacent reflective sheets can be positioned, thereby saving assembly time, eliminating the need for gluing, reducing gluing and manufacturing costs, and being suitable for all three-dimensional reflective sheet designs.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more fully understand the embodiments of the present invention and its advantages, the following description is now made with reference to the accompanying drawings, in which:

FIG1 is a perspective exploded view of a first preferred embodiment of a backlight module with a spliced reflective sheet according to the present invention;

FIG2 is a perspective view illustrating the assembled state of FIG1;

FIG3 is a perspective exploded view of a second preferred embodiment of a backlight module with a spliced reflective sheet according to the present invention;

FIG4 is an enlarged schematic diagram illustrating the cross-sectional structure of FIG3 after assembly;

FIG5 is an enlarged schematic diagram of a preferred embodiment of the display device of the present invention;

FIG6 is a perspective view illustrating another type of fixing member in the second preferred embodiment; and

FIG. 7 is a perspective view illustrating another type of fixing member in the second preferred embodiment.

DETAILED DESCRIPTION

The features and technical contents of the related patent applications of the present invention will be clearly presented in the following detailed description of the preferred embodiments in conjunction with the accompanying drawings. It should be noted before the detailed description that similar components are represented by the same number. In addition, the directional terms mentioned in the following embodiments, such as: up, down, left, right, front, back, bottom, top, etc., are only referenced to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate, not to limit the present invention.

Referring to FIG1 , the first preferred embodiment of the backlight module of the present invention having a spliced reflective sheet includes a light-emitting unit 2, a plurality of reflective sheets 3 and a fixing member 4. It should be noted that the number of fixing members 4 can be adjusted depending on the size of the backlight module. This preferred embodiment is described by taking one as an example, but is not limited thereto. The light-emitting unit 2 includes a circuit board 21 and a plurality of light-emitting members 22 arranged at intervals on the circuit board 21. A plurality of reflective sheets 3 are arranged on the circuit board 21 and partially overlap. In other words, each reflective sheet 3 can be divided into an overlapping area 3a and a non-overlapping area 3b connected to the overlapping area 3a, and the overlapping areas 3a of adjacent reflective sheets 3 are stacked up and down.

In more detail, each reflector sheet 3 has a plurality of reflector cups 31 arranged in a matrix, and adjacent reflectors 3 overlap each other through a plurality of reflector cups 31. As shown in FIG1 , in this preferred embodiment, the leftmost row of reflector cups 31 of the reflector sheet 3 located above overlaps the rightmost row of reflector cups 31 of the reflector sheet 3 located below. As shown in FIG2 , when the reflectors 3 overlap each other, the fixing member 4 is disposed at the intersection of the overlapping portions of the reflectors 3 to clamp and position the two adjacent reflectors 3. By overlapping or at least partially overlapping the adjacent reflectors 3 with a plurality of reflector cups 31, the reflector cups 31 located at the lower layer will be shielded by the reflector cups 31 located at the upper layer, and the fixing member 4 is disposed at the intersection of the overlapping portions of the reflectors 3, so that the adjacent reflectors 3 can be combined quickly and stably. At the same time, the technical effects of less working hours, no need for gluing, reduced gluing costs, and applicable to all three-dimensional reflector sheet designs can also be achieved.

As shown in FIG. 1 , each reflector cup 31 has a bottom wall 311 and a surrounding wall 312 connected to the bottom wall 311. Each reflector sheet 3 has a plurality of through holes 313 formed on the bottom wall of each reflector cup 31. 311, and for the light emitting element 22 of the light emitting unit 2 to extend therein. In this preferred embodiment, the adjacent reflective sheets 3 are completely overlapped by a plurality of reflective cups 31. More specifically, the surrounding wall 312 of the reflective cup 31 located at the lower layer will be completely shielded by the surrounding wall 312 of the reflective cup 31 located at the upper layer. With this design, the splicing area will not have any unevenness or discontinuity on the surrounding wall 312 near the light emitting side, so the optical effect of the spliced reflective sheet can be effectively maintained.

Referring to FIG. 2 and in conjunction with FIG. 1 , the fixing member 4 is disposed at the overlapping intersection of the reflective sheet 3 to clamp and position the adjacent reflective sheet 3. In order to strengthen the force of the fixing member 4 to press and fix the reflective sheet 3, the fixing member 4 has a plurality of clamping portions 41, and the overlapping intersection of the reflective sheet 3 is clamped between two adjacent clamping portions 41. Referring to FIG. 2 , in this preferred embodiment, the fixing member 4 has two clamping portions 41, and the two clamping portions 41 are extended into different reflective cups 31, one of the clamping portions 41 is extended into the reflective cups 31 that overlap each other, and the other clamping portion 41 is extended into the reflective cups 31 that do not overlap each other, that is, one of the clamping portions 41 is extended into the overlapping area 3a, and the other clamping portion 41 is extended into the non-overlapping area 3b. With this design, a good pressing and fixing effect can be achieved by surrounding the overlapping intersection of the reflective sheet 3 with a plurality of clamping portions 41.

It should be further explained that the top edge of the surrounding wall 312 of each reflector cup 31 is surrounded by a polygon, and the fixing member 4 can be set at one edge or one corner of the surrounding wall 312. The overlapping ones of the multiple reflector cups 31 are arranged along one of the first axial direction 11 or the second axial direction 12. When the fixing member 4 is set at one edge of the surrounding wall 312, the multiple clamping parts 41 of the fixing member 4 are arranged at intervals along the other of the first axial direction 11 or the second axial direction 12, and the first axial direction 11 is not parallel to the second axial direction 12. That is, in FIG. 1, the overlapping reflector cups 31 are arranged along the first axial direction 11, and the multiple clamping parts 41 of the fixing member 4 are arranged along the second axial direction 12.

Through the above design, adjacent reflectors 3 are assembled by completely overlapping several reflector cups 31, and then the fixing member 4 is set at the intersection of the overlapping parts of the reflectors 3, so that the adjacent reflectors 3 can be clamped and positioned. Since the reflector cups 31 are concave, they are not easy to separate from each other after being completely overlapped. Therefore, there is no need to design other additional combining structures (such as lugs) on each reflector 3, nor is there a need to set fixing tapes between the reflectors 3 for gluing operations. The assembly operation can be completed by clamping with the fixing member 4, which not only simplifies the assembly process, but also reduces material costs. In addition, the fixing member 4 is made of a light-transmitting material, and the light emitted by the light-emitting unit 2 can penetrate the fixing member 4 and be reflected upward through the reflector cup 31, so it will not affect the light of the light-emitting unit 22. The transmission of lines and the optical effect of the backlight module.

Referring to FIG. 3 , the second preferred embodiment of the backlight module with a spliced reflective sheet of the present invention comprises a light-emitting unit 2, a plurality of reflective sheets 3 and a fixing member 4. The light-emitting unit 2 comprises a circuit board 21 and a plurality of light-emitting members 22 arranged at intervals on the circuit board 21, and a plurality of reflective sheets 3 are arranged on the circuit board 21 and partially overlap. The similarities with the first preferred embodiment are not repeated here, but the difference from the first preferred embodiment is that the circuit board 21 has at least one through hole 211, and each reflective sheet 3 has a plurality of reflective cups 31 arranged in a matrix and at least one positioning hole 32 located at the junction of the plurality of reflective cups 31. Among them, the through holes 211 of the circuit board 21 and the positioning holes 32 of each reflective sheet 3 correspond to each other in their setting positions. In this preferred embodiment, the fixing member 4 has a plurality of clamping portions 41 and a columnar portion 42 extending downward from the clamping portions 41.

Among them, the overlapping reflective cups 31 are arranged along one of the first axis 11 or the second axis 12, and the fixing member 4 is arranged at one of the corners of the surrounding wall 312. At this time, the multiple clamping parts 41 of the fixing member 4 are arranged along the third axis 13, and the third axis 13 is not parallel and not perpendicular to the first axis 11 and the second axis 12, wherein the first axis 11, the second axis 12, and the third axis 13 refer to three directions on the same plane. That is to say, in Figures 3 and 4, the overlapping reflective cups 31 are arranged along the first axis 11, and the multiple clamping parts 41 of the fixing member 4 are arranged along the third axis 13. In this preferred embodiment, the fixing member 4 is arranged at the common corner of the overlapping intersection of the reflective sheets 3, so that the multiple clamping parts 41 clamp and position the adjacent reflective sheets 3. The fixing member 4 has two clamping parts 41, and the two clamping parts 41 are respectively extended into two reflective cups 31 located at diagonal lines, one of the clamping parts 41 is extended into the overlapping reflective cups 31, and the other clamping part 41 is extended into the non-overlapping reflective cups 31. In this way, the fixing member 4 can be designed at one edge or one corner of the surrounding wall 312 according to actual use requirements.

It should also be noted that when multiple reflective sheets 3 overlap, the positioning holes 32 on different reflective sheets 3 will overlap with each other. In order to fix the fixing member 4 so that it does not lose the pressing and fixing effect on the reflective sheet 3 due to displacement during transportation or testing, when the fixing member 4 of this embodiment is penetrated and positioned, the column portion 42 will first pass through the positioning hole 32 of the reflective sheet 3 and then pass through the penetration hole 211 of the circuit board 21. As shown in Figure 4, the backlight module also includes a bottom frame 5, which is used to carry the light-emitting unit 2, and the fixing member 4 will pass through the circuit board 21 of the light-emitting unit 2 and be fixed on the bottom frame 5. In this way, the fixing member 4 can not only clamp and fix the reflective sheet 3, but also position the reflective sheet 3. Located on the circuit board 21, the fixing member 4 can avoid displacement during transportation or testing.

In addition, the fixing member 4 further has a top support portion 43 extending upward from the clamping portion 41, and the backlight module further includes at least one optical film 6 disposed on the reflective sheet 3, and the top support portion 43 of the fixing member 4 is used to support the at least one optical film 6. Generally speaking, the at least one optical film 6 can be an optical film of a diffusion plate, a diffusion sheet, a prism sheet, etc., so it should not be limited to the description of this embodiment.

By means of the structural design of the clamping portion 41, the column portion 42, and the top support portion 43 of the fixing member 4, the clamping portion 41 of the fixing member 4 can clamp and position the overlapping reflective sheets 3, the column portion 42 can be used to position the reflective sheet 3 on the circuit board 21, and the top support portion 43 can support the optical film 6. In other words, the present invention can achieve multiple functions such as clamping, positioning, and top support by using the single element of the fixing member 4. In this way, it can be suitable for the design of the vehicle-mounted machine mechanism, and the interlocking design between the clamping portion 41 and the surrounding wall 312 can remove the glue design of the conventional technology, so as to achieve the purpose of eliminating the need for glue, reducing the glue cost and the probability of rework, reducing the assembly cost, and improving the overall value of the backlight module.

5 , a display panel 7 is disposed on the backlight module to form a display device.

6 and 7, the number of clamping parts 41 of the fixing member 4 can also be four, so that it can be simultaneously extended into four reflective cups 31 to achieve a more stable clamping effect. In addition, the top surface of the clamping part 41 can also be a rectangle as shown in FIG6 or a circle as shown in FIG7, which can be selected according to different needs.

In summary, the present invention has a backlight module and a display device with a spliced reflective sheet. By overlapping or at least partially overlapping adjacent reflective sheets 3 with a plurality of reflective cups 31, and then setting the fixing member 4 at the intersection of the overlapping portions of the reflective sheets 3 for clamping, the adjacent reflective sheets 3 can be positioned, thereby saving assembly time, eliminating the need for gluing, reducing gluing and manufacturing costs, and being applicable to all three-dimensional reflective sheet designs. The structural design of the clamping portion 41, the column portion 42, and the supporting portion 43 of the fixing member 4 enables the fixing member 4 to achieve multiple functions such as clamping, positioning, and supporting with a single component, and can indeed achieve the purpose of the present invention.

The above description is only a preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made according to the scope of the patent application and the description of the present invention are still within the scope of the patent of the present invention.

[List of Reference Numerals]
11 First Axis
12 Second Axis
13 Third Axis
2 Lighting units
21 Circuit Board
211 drilling hole
22 Luminous parts
3 Reflective sheet
3a Overlapping area
3b Non-overlapping area
31 Reflection cup
311 Bottom wall
312 Surrounding Wall
313 Perforation
32 Positioning holes
4 Fixing parts
41 Clamping part
42 Column
43 Top support
5 Bottom frame
6 Optical film
7 Display panel.

Claims

A backlight module with a spliced reflective sheet, comprising:

A light-emitting unit, comprising a circuit board and a plurality of light-emitting elements spaced apart on the circuit board;

A plurality of reflective sheets, which are disposed on the circuit board, and the plurality of reflective sheets partially overlap each other, wherein each of the reflective sheets has a plurality of through holes, which are respectively used for the plurality of light-emitting elements of the light-emitting unit to extend therein; and

At least one fixing member is arranged at the overlapping and intersecting position of the reflecting sheets to clamp and position the adjacent reflecting sheets.
According to the backlight module with a spliced reflective sheet as described in claim 1, each of the reflective sheets has a plurality of reflective cups arranged in a matrix, adjacent reflective sheets are overlapped in a manner that a plurality of reflective cups are completely overlapped, each of the reflective cups has a bottom wall and a surrounding wall connected to the bottom wall, the through holes are respectively formed on the bottom wall of each of the reflective cups, and the at least one fixing member is clamped on the surrounding walls of the reflective cups of two adjacent reflective sheets.
According to the backlight module with a spliced reflective sheet as described in claim 2, wherein the at least one fixing member has a plurality of clamping parts, and the overlapping intersection position of the reflective sheet is clamped between two adjacent clamping parts.
According to the backlight module with a spliced reflector sheet as described in claim 3, wherein the multiple clamping portions of the at least one fixing member extend into different reflective cups, wherein a portion of the clamping portions extend into reflective cups that overlap with each other, and another portion of the clamping portions extend into reflective cups that do not overlap with each other.
According to the backlight module with a spliced reflector sheet as described in claim 3, wherein the multiple reflector cups that overlap each other are arranged along one of the first axis or the second axis, the multiple clamping portions of the at least one fixing member are arranged at intervals along the other of the first axis or the second axis, and the first axis is non-parallel to the second axis.
According to the backlight module with a spliced reflector sheet as described in claim 3, wherein the overlapping reflector cups are arranged along one of the first axis or the second axis, and the multiple clamping portions of the at least one fixing member are arranged at intervals along a third axis, and the third axis is not parallel and not perpendicular to the first axis and the second axis.
According to the backlight module with a spliced reflective sheet as described in claim 3, wherein the at least one fixing member also has a column portion extending downward from the clamping portion, and each of the reflective sheets also has at least one positioning hole located at the junction of the reflective cups, and the column portion of the at least one fixing member is inserted into the positioning hole.
According to the backlight module with a spliced reflective sheet according to claim 7, wherein the circuit board of the light-emitting unit has at least one through hole corresponding to the positioning hole of the reflective sheet, and the column portion of the at least one fixing member is penetrated through the positioning hole of the reflective sheet and the at least one through hole of the circuit board.
According to the backlight module with a spliced reflective sheet as described in claim 3, wherein the at least one fixing member also has a top supporting portion extending upward from the clamping portion, and the backlight module with a spliced reflective sheet also includes at least one optical film sheet arranged on the reflective sheet, and the top supporting portion of the at least one fixing member is used to support the at least one optical film sheet.
A backlight module with a spliced reflective sheet according to any one of claims 1 to 9, wherein the at least one fixing member is made of a light-transmitting material.
The backlight module with a spliced reflective sheet according to any one of claims 1 to 9 further comprises a bottom frame for carrying the light-emitting unit, wherein the at least one fixing member passes through the circuit board of the light-emitting unit and is fixed to the bottom frame.
A backlight module with a spliced reflective sheet according to any one of claims 2 to 9, wherein the surrounding wall of the reflective cup located at the lower layer is completely shielded by the surrounding wall of the reflective cup located at the upper layer.
According to any one of claims 2 to 9, the backlight module with a spliced reflector sheet, wherein the top edge of the surrounding wall of each of the reflector cups is surrounded by a polygon, and the at least one fixing member is arranged at one edge or one corner of the surrounding wall.
A backlight module with a spliced reflective sheet, comprising:

A light-emitting unit, comprising a circuit board and a plurality of light-emitting elements spaced apart on the circuit board;

A plurality of reflective sheets disposed on the circuit board, each of the reflective sheets having a plurality of through holes for allowing the plurality of light-emitting elements of the light-emitting unit to extend therein, each of the reflective sheets being divided into an overlapping area and a non-overlapping area connected to the overlapping area, and the overlapping areas of adjacent reflective sheets being stacked up and down; and

At least one fixing member has a plurality of clamping parts, wherein a portion of the clamping parts extends into the overlapping area, and another portion of the clamping parts extends into the non-overlapping area.
A display device comprises a backlight module with a spliced reflective sheet according to any one of claims 1 to 14, and a display panel arranged on the backlight module.