Backlight module and display device having a spliced reflective sheet

Abstract

A backlight module having a spliced reflective sheet (3) includes a light-emitting unit (2), a plurality of reflective sheets (3), and at least one fixing member (4). The light-emitting unit (2) includes a circuit board (21) and a plurality of light-emitting elements (22) spaced apart on the circuit board (21). The reflective sheets (3) are disposed on the circuit board (21) and partially overlap. At least one fixing member (4) is disposed at the junction position of the overlapping portions of the reflective sheets (3) to clamp and position adjacent reflective sheets (3). By overlapping or at least partially laminating adjacent reflective sheets (3) with a plurality of reflective cups (31), and then disposing at least one fixing member (4) at the junction position of the overlapping portions of the reflective sheets (3) for clamping, adjacent reflective sheets (3) can be positioned, saving assembly time and manufacturing cost. A display device including the backlight module is also provided.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 202310195603.0 and the invention title "Backlight Module and Display Device with a Spliced Reflector Sheet" filed on March 1, 2023, the entire content of which is incorporated herein by reference. Technical Field

[0002] The present invention relates to an optical device, and in particular to a backlight module and a display device with a spliced reflector sheet. Background Art

[0003] In recent years, due to the characteristics of liquid crystal display devices such as being light, thin, small, and having low power consumption, they have been widely used in electronic imaging products such as laptop computers, digital cameras, and televisions. Since liquid crystals themselves do not have the property of emitting light, a backlight module is required to provide a surface light source. The backlight module can be roughly divided into: a side-lighting type backlight module and a direct-lit type backlight module. Among them, the direct-lit type backlight module requires a longer light mixing distance to achieve the effect of uniform light mixing, so the direct-lit type backlight module has a thicker thickness, which is not conducive to the production of thin display devices; while the side-lighting type backlight module can be used in combination with light-emitting diodes and has the advantage of a thinner thickness.

[0004] In order to reduce production costs and manufacturing difficulties, for larger-sized backlight modules, internal components such as reflector sheets usually use the method of splicing small sizes into large sizes to meet the usage requirements of large sizes. However, traditional splicing methods also require the use of fixing tapes for pasting, which will increase material costs and assembly man-hours. Summary of the Invention

[0005] Therefore, an object of the present invention is to provide a backlight module that can shorten assembly man-hours.

[0006] According to the above object, the present invention discloses a backlight module with a spliced reflector sheet, which includes a light-emitting unit, a plurality of reflector sheets, and at least one fixing member. The light-emitting unit includes a circuit board and a plurality of light-emitting elements spaced apart on the circuit board. The plurality of reflector sheets are disposed on the circuit board and partially overlap. Each reflector sheet has a plurality of through holes respectively for the plurality of light-emitting elements of the light-emitting unit to extend therein. At least one fixing member is disposed at the overlapping joint position of the reflector sheets to clamp and position adjacent reflector sheets.

[0007] Another technical means of the present invention is that each reflector sheet has a plurality of reflecting cups arranged in a matrix, and adjacent reflector sheets overlap in such a way that several reflecting cups completely overlap. Each reflecting cup has a bottom wall and a surrounding wall connected to the bottom wall, and through holes are respectively formed in the bottom wall of each reflecting cup. At least one fixing member is clamped on the surrounding walls of the reflecting cups of two adjacent reflector sheets.

[0008] Another technical means of the present invention is that at least one fixing member has a plurality of clamping portions, and the overlapping joint position of the reflective sheets is clamped between two adjacent clamping portions.

[0009] Another technical means of the present invention is that the plurality of clamping portions of at least one fixing member extend into different reflecting cups, wherein a part of the clamping portions extend into the mutually overlapping reflecting cups, and another part of the clamping portions extend into the non-overlapping reflecting cups.

[0010] Another technical means of the present invention is that the mutually overlapping reflecting cups in the reflecting cups are arranged along one of the first axis or the second axis, the plurality of clamping portions 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.

[0011] Another technical means of the present invention is that the mutually overlapping reflecting cups in the reflecting cups are arranged along one of the first axis or the second axis, the plurality of clamping portions of at least one fixing member are arranged at intervals along the third axis, and the third axis is not parallel and not perpendicular to the first axis and the second axis.

[0012] Another technical means of the present invention is that at least one fixing member further has a column portion extending downward from the clamping portion, each reflective sheet further has at least one positioning hole located at the joint of the reflecting cup, and the column portion of at least one fixing member penetrates through the positioning hole.

[0013] 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 reflective sheet, and the column portion of at least one fixing member penetrates through the positioning hole of the reflective sheet and at least one through hole of the circuit board.

[0014] Another technical means of the present invention is that at least one fixing member further has a top support portion extending upward from the clamping portion, the backlight module having a spliced reflective sheet further includes at least one optical film disposed on the reflective sheet, and the top support portion of at least one fixing member is used to support at least one optical film.

[0015] Another technical means of the present invention is that at least one fixing member is made of a light-transmitting material.

[0016] Another technical means of the present invention is that the backlight module having a spliced reflective sheet further includes a bottom frame for carrying the light-emitting unit, wherein at least one fixing member passes through the circuit board of the light-emitting unit and is fixed to the bottom frame.

[0017] Another technical means of the present invention is that the surrounding wall of the reflecting cup located at the lower layer is completely shielded by the surrounding wall of the reflecting cup located at the upper layer.

[0018] Another technical means of the present invention is that the top edge of the surrounding wall of each reflecting cup is surrounded by a polygon, and at least one fixing member is disposed on one edge or one corner of the surrounding wall.

[0019] The present invention discloses another 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 plurality of light-emitting components spaced apart on the circuit board. The reflective sheets are disposed on the circuit board. Each reflective sheet has a plurality of through holes respectively for a plurality of light-emitting components 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. The overlapping areas of adjacent reflective sheets are stacked one above the other. At least one fixing member has a plurality of clamping portions, with a part of the clamping portions extending into the overlapping area and another part of the clamping portions extending into the non-overlapping area.

[0020] Another object of the present invention is to provide a display device, which includes the backlight module with a spliced reflective sheet as described above, and a display panel disposed on the backlight module.

[0021] The efficacy of the present invention lies in that adjacent reflective sheets are overlapped or at least partially overlapped by several reflecting cups, and then at least one fixing member is disposed at the junction position of the overlapping portions of the reflective sheets for clamping, so that adjacent reflective sheets can be positioned. Thereby, the assembly man-hours can be saved, gluing is not required, and the gluing and manufacturing costs are reduced, which is applicable to all three-dimensional reflective sheet designs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more fully understand the embodiments of the present invention and their advantages, the following description is now made with reference to the accompanying drawings, in which:

[0023] Figure 1 is a three-dimensional exploded view of the first preferred embodiment of the backlight module with a spliced reflective sheet of the present invention;

[0024] Figure 2 is to illustrate Figure 1 a three-dimensional view of the combined form;

[0025] Figure 3 is a three-dimensional exploded view of the second preferred embodiment of the backlight module with a spliced reflective sheet of the present invention;

[0026] Figure 4 is to illustrate Figure 3 an enlarged schematic diagram of the cross-sectional structure after combination;

[0027] Figure 5 is an enlarged schematic diagram of the preferred embodiment of the display device of the present invention;

[0028] Figure 6 is a three-dimensional view to illustrate another form of the fixing member in the second preferred embodiment; and

[0029] Figure 7 It is a perspective view showing another form of the fixing member in the second preferred embodiment. Detailed implementation manners

[0030] Regarding the relevant patented features and technical content of the present invention, they 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 elements are denoted by the same reference numerals. In addition, the directional terms mentioned in the following implementation manners, such as: up, down, left, right, front, rear, bottom, top, etc., are only with reference to the directions of the accompanying drawings. Therefore, the directional terms used are for illustration and not for limiting the present invention.

[0031] Refer to Figure 1 , which is the first preferred embodiment of the backlight module with a spliced reflective sheet according to the present invention, and it 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 the fixing members 4 can be adjusted according to the size of the backlight module. In this preferred embodiment, one is taken as an example for illustration, but not limited thereto. The light-emitting unit 2 includes a circuit board 21 and a plurality of light-emitting members 22 spaced apart and disposed on the circuit board 21. The plurality of reflective sheets 3 are disposed on the circuit board 21 and partially overlap. That is to say, 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 one above the other.

[0032] More specifically, each reflective sheet 3 has a plurality of reflective cups 31 arranged in a matrix, and adjacent reflective sheets 3 overlap each other through several reflective cups 31. As Figure 1 shown, in this preferred embodiment, the leftmost row of reflective cups 31 of the upper reflective sheet 3 is stacked in the rightmost row of reflective cups 31 of the lower reflective sheet 3. As Figure 2 shown, after the reflective sheets 3 are stacked on each other, the fixing member 4 is disposed at the junction position of the overlapping portion of the reflective sheets 3 to clamp and position two adjacent reflective sheets 3. By overlapping or at least partially overlapping adjacent reflective sheets 3 through several reflective cups 31, the lower reflective cups 31 will be shielded by the upper reflective cups 31. Coupled with the fixing member 4 being disposed at the junction position of the overlapping portion of the reflective sheets 3, the effect of quickly and firmly combining adjacent reflective sheets 3 can be achieved. At the same time, the technical effects of less working hours, no need for gluing, reducing the gluing cost, and being applicable to all three-dimensional reflective sheet designs can also be realized.

[0033] As Figure 1As shown, 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 perforations 313, which are respectively formed in the bottom wall 311 of each reflector cup 31 and are used for the light-emitting elements 22 of the light-emitting unit 2 to extend therein. In this preferred embodiment, adjacent reflector sheets 3 are completely overlapped by several reflector cups 31. More specifically, the surrounding wall 312 of the reflector cup 31 located in the lower layer is completely covered by the surrounding wall 312 of the reflector cup 31 located in the upper layer. With this design, no unevenness or step difference will occur on the surrounding wall 312 near the light-emitting side of the splicing area, so the optical effect of the spliced reflector sheet can be effectively maintained.

[0034] Referring to Figure 2 and cooperating with Figure 1 , the fixing member 4 is disposed at the overlapping junction position of the reflector sheet 3 to clamp and position adjacent reflector sheets 3. In order to strengthen the force of the fixing member 4 to press and fix the reflector sheet 3, the fixing member 4 has a plurality of clamping portions 41, and the overlapping junction position of the reflector sheet 3 is clamped between two adjacent clamping portions 41. Referring to Figure 2 , in this preferred embodiment, the fixing member 4 has two clamping portions 41, and the two clamping portions 41 extend into different reflector cups 31. One clamping portion 41 extends into the mutually overlapping reflector cups 31, and the other clamping portion 41 extends into the non-overlapping reflector cups 31. That is to say, one clamping portion 41 extends into the overlapping area 3a, and the other clamping portion 41 extends into the non-overlapping area 3b. With this design, a good pressing and fixing effect can be achieved by surrounding the overlapping junction position of the reflector sheet 3 with a plurality of clamping portions 41.

[0035] It should be further noted 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 disposed at one of the edges or one of the corners of the surrounding wall 312. The mutually overlapping ones among the plurality of reflector cups 31 are arranged along one of the first axis 11 or the second axis 12. When the fixing member 4 is disposed at one of the edges of the surrounding wall 312, the plurality of clamping portions 41 of the fixing member 4 are arranged at intervals along the other of the first axis 11 or the second axis 12, and the first axis 11 and the second axis 12 are not parallel. That is to say, in Figure 1 , the mutually overlapping reflector cups 31 are arranged along the first axis 11, and the plurality of clamping portions 41 of the fixing member 4 are arranged along the second axis 12.

[0036] Through the above design, adjacent reflective sheets 3 are assembled by completely overlapping several reflecting cups 31, and then the fixing member 4 is disposed at the overlapping junction of the reflective sheets 3 to clamp and position the adjacent reflective sheets 3. Since the reflecting cups 31 are concave, they are not easily separated from each other after complete overlap. Therefore, there is no need to additionally design other coupling structures (such as lugs) on each reflective sheet 3, nor is it necessary to provide a fixing tape between the reflective sheets 3 for pasting operations and then cooperate with the fixing member 4 for clamping to complete the assembly operation. Thus, not only the assembly procedure is simplified, but also the material cost can be reduced. In addition, the fixing member 4 is made of a light-transmissive material, and the light emitted by the light-emitting unit 2 can pass through the fixing member 4 and be reflected upward through the reflecting cups 31. Therefore, it does not affect the transmission of the light of the light-emitting member 22 and the optical effect of the backlight module.

[0037] Refer to Figure 3 , which is the second preferred embodiment of the backlight module with a spliced reflective sheet according to the present invention, and includes a light-emitting unit 2, a plurality of reflective sheets 3, and a fixing member 4. The light-emitting unit 2 includes a circuit board 21 and a plurality of light-emitting members 22 spaced apart on the circuit board 21. The plurality of reflective sheets 3 are disposed on the circuit board 21 and partially overlap. The same parts as those in the first preferred embodiment will not be described again, and the differences from the first preferred embodiment are as follows: The circuit board 21 has at least one through hole 211, and each reflective sheet 3 has a plurality of reflecting cups 31 arranged in a matrix and at least one positioning hole 32 located at the junction of the plurality of reflecting cups 31. Among them, the positions of the through holes 211 of the circuit board 21 correspond to the positions of the positioning holes 32 of each reflective sheet 3. 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.

[0038] Among them, the overlapping ones among the plurality of reflecting cups 31 are arranged along one of the first axis 11 or the second axis 12, and the fixing member 4 is disposed at one corner of the surrounding wall 312. At this time, the plurality of clamping portions 41 of the fixing member 4 are arranged along the third axis 13, and the third axis 13 is neither parallel nor perpendicular to the first axis 11 and the second axis 12. Among them, the first axis 11, the second axis 12, and the third axis 13 refer to three directions in the same plane. That is to say, in Figure 3 and Figure 4Among them, the mutually overlapping reflecting cups 31 are arranged along the first axial direction 11, while the multiple clamping portions 41 of the fixing member 4 are arranged along the third axial direction 13. In this preferred embodiment, the fixing member 4 is disposed at the common corner of the overlapping junction position of the reflecting sheet 3, so that the multiple clamping portions 41 clamp and position the adjacent reflecting sheets 3. Among them, the fixing member 4 has two clamping portions 41, and the two clamping portions 41 respectively extend into two reflecting cups 31 located diagonally. One clamping portion 41 extends into the mutually overlapping reflecting cups 31, and the other clamping portion 41 extends into the non-overlapping reflecting cup 31. In this way, according to actual usage requirements, the fixing member 4 can be designed at one edge or one corner of the surrounding wall 312.

[0039] In addition, it should be particularly noted that when multiple reflecting sheets 3 overlap, the positioning holes 32 on different reflecting sheets 3 will overlap with each other correspondingly. In order to fix the fixing member 4 so that it will not lose the pressing and fixing effect on the reflecting sheet 3 due to displacement during transportation or testing, when the fixing member 4 of this embodiment is being positioned by passing through, the column portion 42 will first pass through the positioning hole 32 of the reflecting sheet 3, and then pass through the through hole 211 of the circuit board 21. As Figure 4 shown, the backlight module further includes a bottom frame 5, which is used to carry the light-emitting unit 2, and the fixing member 4 passes through the circuit board 21 of the light-emitting unit 2 and is fixed on the bottom frame 5. By this method, while the fixing member 4 clamps and fixes the reflecting sheet 3, the reflecting sheet 3 can also be positioned on the circuit board 21, so that the fixing member 4 can avoid displacement during transportation or testing.

[0040] In addition, the fixing member 4 further has a top support portion 43 extending upward from the clamping portion 41. The backlight module further includes at least one optical film 6 disposed on the reflecting sheet 3, and the top support portion 43 of the fixing member 4 is used to support at least one optical film 6. Generally speaking, the at least one optical film 6 can be an optical film such as a diffusion plate, a diffusion sheet, a prism sheet, etc., so it should not be limited to the description of this embodiment.

[0041] 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 mutually overlapping reflecting sheets 3, the column portion 42 can be used to position the reflecting sheet 3 on the circuit board 21, and the top support portion 43 can support the optical film 6. That is to say, the present invention can achieve various functions such as clamping, positioning, and top support by using a single element of the fixing member 4. In this way, it can be applied to the mechanism design of in-vehicle models, and by using the fitting design between the clamping portion 41 and the surrounding wall 312, the glue sticking design of the prior art can be removed, so as to achieve the purpose of eliminating glue sticking, reducing the glue sticking cost and the rework probability, reducing the assembly cost, and improving the overall value of the backlight module.

[0042] Refer to Figure 5, a display panel 7 is disposed on the backlight module, thus forming a display device.

[0043] Refer to Figure 6 and Figure 7 , the clamping portions 41 of the fixing member 4 can also be four, so that they can be simultaneously extended into four reflecting cups 31, so as to have a more stable clamping effect. In addition, the top surface of the clamping portion 41 can also be rectangular as shown in Figure 6 or circular as shown in Figure 7 , which can be selected according to different requirements.

[0044] In summary, the present invention provides a backlight module and a display device with a spliced reflective sheet. By overlapping or at least partially overlapping adjacent reflective sheets 3 with several reflecting cups 31, and then disposing the fixing member 4 at the overlapping junction position of the reflective sheets 3 for clamping, the adjacent reflective sheets 3 can be positioned, thereby achieving the technical effects of 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 top support portion 43 of the fixing member 4 enables the fixing member 4 to achieve various functions such as clamping, positioning, and top support with a single component, and can indeed achieve the purpose of the present invention.

[0045] The above are only the preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention. That is, all simple equivalent changes and modifications made according to the scope of the patent application and the description content of the present invention still fall within the scope of the patent of the present invention.

[0046]

List of Reference Numerals

[0047] 11 First axial direction

[0048] 12 Second axial direction

[0049] 13 Third axial direction

[0050] 2 Light-emitting unit

[0051] 21 Circuit board

[0052] 211 Through hole

[0053] 22 Light-emitting element

[0054] 3 Reflective sheet

[0055] 3a Overlapping area

[0056] 3b Non-overlapping area

[0057] 31 Reflecting cup

[0058] 311 Bottom wall

[0059] 312 Surrounding wall

[0060] 313 Perforation

[0061] 32 Positioning Hole

[0062] 4 Fastener

[0063] 41 Clamping Portion

[0064] 42 Cylindrical Portion

[0065] 43 Bracing Portion

[0066] 5 Bottom Frame

[0067] 6 Optical Film

[0068] 7 Display Panel.

Claims

1. A backlight module with a spliced reflector, comprising: A light-emitting unit, which includes a circuit board and a plurality of light-emitting elements spaced on the circuit board; A plurality of reflective sheets are disposed on the circuit board, and a plurality of the reflective sheets partially overlap, wherein, Each of the reflectors has a plurality of through holes, which are respectively used for a plurality of the light-emitting elements of the light-emitting unit to extend therein; And At least one fixing member, which is arranged at the intersection position of the overlapping parts of the reflectors to clamp and position adjacent reflectors, Wherein, each of the reflectors has a plurality of reflecting cups arranged in a matrix, adjacent reflectors overlap in such a way that several reflecting cups are completely stacked, each reflecting cup has a bottom wall and a surrounding wall connected to the bottom wall, the through holes are respectively formed in the bottom wall of each reflecting cup, and the at least one fixing member is clamped on the surrounding walls of the reflecting cups of two adjacent reflectors.

2. The backlight module with a spliced reflective sheet according to claim 1, wherein, The at least one fixing member has a plurality of clamping portions, and the intersection position of the overlapping parts of the reflectors is clamped between two adjacent clamping portions.

3. The backlight module with a spliced reflective sheet according to claim 2, wherein, The plurality of clamping portions of the at least one fixing member extend into different reflecting cups, wherein a part of the clamping portions extend into the mutually stacked reflecting cups, and another part of the clamping portions extend into the non-stacked reflecting cups.

4. The backlight module with a spliced reflective sheet according to claim 2, wherein, The mutually stacked ones among the plurality of reflecting cups are arranged along one of a first axis or a second axis, the plurality of clamping portions of the at least one fixing member are spaced along the other of the first axis or the second axis, and the first axis and the second axis are not parallel.

5. The backlight module with a spliced reflective sheet according to claim 2, wherein, The mutually stacked ones among the reflecting cups are arranged along one of a first axis or a second axis, the plurality of clamping portions of the at least one fixing member are spaced along a third axis, and the third axis is not parallel and not perpendicular to the first axis and the second axis.

6. The backlight module with a spliced reflective sheet according to claim 2, wherein, The at least one fixing member further has a column portion extending downward from the clamping portion, each reflector further has at least one positioning hole located at the junction of the reflecting cups, and the column portion of the at least one fixing member passes through the positioning hole.

7. The backlight module with a spliced reflective sheet according to claim 6, wherein, 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 the at least one fixing member passes through the positioning hole of the reflector and the at least one through hole of the circuit board.

8. The backlight module with a spliced reflective sheet according to claim 2, wherein, The at least one fixing member further has a top support portion extending upward from the clamping portion, the backlight module with a spliced reflector further includes at least one optical film disposed on the reflector, and the top support portion of the at least one fixing member is used to support the at least one optical film.

9. The backlight module with a spliced reflective sheet according to any one of claims 1 to 8, wherein, The at least one fixing member is made of a light-transmitting material.

10. The backlight module with a spliced reflective sheet according to any one of claims 1 to 8 further includes 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.

11. The backlight module with a spliced reflective sheet according to any one of claims 1 to 8, wherein, The surrounding wall of the reflecting cup located in the lower layer is completely shielded by the surrounding wall of the reflecting cup located in the upper layer.

12. The backlight module with a spliced reflective sheet according to any one of claims 1 to 8, wherein, The top edge of the surrounding wall of each reflecting cup surrounds a polygon, and the at least one fixing member is arranged at one of the edges or one of the corners of the surrounding wall.

13. A backlight module with a spliced reflector, comprising: A light-emitting unit, which includes a circuit board and a plurality of light-emitting elements spaced on the circuit board; A plurality of reflection sheets are disposed on the circuit board, and each of the reflection sheets has a plurality of through holes respectively for the plurality of light-emitting elements of the light-emitting unit to extend therein. Each of the reflective sheets 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 one above the other; and At least one fixing member having a plurality of clamping portions, with a part of the clamping portions extending into the overlapping area and another part of the clamping portions extending into the non-overlapping area.

14. A display device, comprising a backlight module having a spliced reflective sheet according to any one of claims 1 to 13, and a display panel disposed on the backlight module.

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