Direct type backlight module with reflector plate positioning design and display device

Abstract

A direct type backlight module with a reflector plate (5) positioning design comprises a fixed frame (2), a back frame (3) combined with the fixed frame (2), a light-emitting unit (4) arranged on the back frame (3) and a reflector plate (5) arranged on the light-emitting unit (4). The fixing frame (2) is provided with at least one combination hole (21). The back frame (3) is provided with at least one first positioning piece (31), and the first positioning piece (31) is correspondingly arranged in the combination hole (21) of the fixing frame (2). The reflector plate (5) is provided with at least one second positioning piece (51), and the second positioning piece (51) is correspondingly combined with the first positioning piece (31) of the back frame (3). By changing the combination structure among the fixed frame (2), the back frame (3) and the reflector plate (5), the width of the frame can be reduced so as to meet the requirement of a narrow frame. The invention further provides a display device comprising the backlight module.

Description

Direct-lit backlight module and display device with reflector positioning design Technical Field

[0001] The present invention relates to an optical device, in particular to a direct-lit backlight module and a display device with a reflector positioning design. Background Art

[0002] Existing display devices are mainly trending towards thinner and larger designs, especially narrow-framed displays, which not only have aesthetic functions but also increase the display area of ​​the display.

[0003] However, the assembly of narrow-frame displays requires high assembly precision. If there is a slight error in the size of a component, the difficulty of assembly will increase. In order to meet the trend of narrow frame of modern mobile devices or various display devices, the current narrow-frame structure mostly adopts methods such as compressing the thickness of frame components and assembly space. However, the thickness of frame components also has a limit, and the assembly mostly adopts a hook design. The hook setting requires the structure of the back frame and the outer frame to cooperate with each other. In this way, the overall structure is thicker, and the back frame needs to be designed with an opening, which makes it easier for water vapor to penetrate and the waterproof function is poor. Therefore, how to develop a direct-type backlight module that can effectively reduce the frame width to meet the design requirements of the narrow frame and has better airtightness and waterproofness is the motivation for this application.

[0004] Summary of the Invention

[0005] Therefore, an object of the present invention is to provide a backlight module capable of reducing the thickness of the frame.

[0006] The present invention discloses a direct-lit backlight module with a reflector positioning design, comprising a fixed frame, a back frame coupled to the fixed frame, a light-emitting unit disposed on the back frame, and a reflector disposed on the light-emitting unit. The fixed frame has at least one coupling hole. The back frame has at least one first positioning member, which is correspondingly disposed within the coupling hole of the fixed frame. The reflector has at least one second positioning member, which is correspondingly coupled to the first positioning member of the back frame.

[0007] Another technical means of the present invention is that the fixing frame includes a side wall portion, the coupling hole is formed on the side wall portion, the back frame includes a side frame portion, the side frame portion has a first surface facing the side wall portion, and a second surface opposite to the first surface, the first positioning member forms a recessed limiting area on the second surface, and the second positioning member of the reflective sheet protrudes toward the side frame portion and extends into the limiting area of ​​the first positioning member of the back frame.

[0008] Another technical means of the present invention is that the first positioning member of the back frame corresponds to the position of the recessed area, protrudes from the first surface of the side frame portion toward the side wall portion, and the first positioning member extends into the coupling hole of the fixed frame.

[0009] The backlight module of the present invention comprises a fixed frame, a back frame coupled to the fixed frame, a light-emitting unit disposed on the back frame, and a reflective sheet disposed on the light-emitting unit. The fixed frame has a plurality of coupling holes. The back frame has at least one first positioning member, which is correspondingly disposed within one of the coupling holes of the fixed frame. The reflective sheet has at least one second positioning member, which is correspondingly coupled within the other of the coupling holes of the fixed frame.

[0010] Another technical means of the present invention is that the fixed frame includes a side wall portion, the combining hole is formed on the side wall portion, the back frame includes a side frame portion, the side frame portion has a first surface facing the side wall portion, the side wall portion of the fixed frame is located between the side frame portion of the back frame and the reflective sheet, the combining hole is divided into a first combining hole and a second combining hole, the first positioning piece protrudes from the first surface of the side frame portion toward the side wall portion and extends into the first combining hole of the fixed frame, and the second positioning piece of the reflective sheet protrudes toward the side wall portion and extends into the second combining hole of the fixed frame.

[0011] Another technical means of the present invention is that the fixed frame includes a side wall portion, which extends longitudinally along a first direction away from the light-emitting unit and extends laterally along a second direction different from the first direction. The first positioning member of the back frame and the second positioning member of the reflective sheet are staggered along the first direction or the second direction.

[0012] Another technical means of the present invention is that the reflective sheet includes a plurality of reflective portions arranged in a matrix, and a frame portion surrounding the reflective portions, and the second positioning member is disposed on the frame portion.

[0013] Another technical means of the present invention is that the backlight module further includes an optical unit having a plurality of optical films, and the frame portion of the inner frame has a plurality of stepped platforms of different heights for bonding and fixing the optical films of the optical unit.

[0014] Another technical means of the present invention is that at least one notch is formed on the top edge of the back frame, and at least a portion of the fixing frame is extended and located in the at least one notch.

[0015] Another technical means of the present invention is that the back frame includes a bottom frame portion and at least one first alignment member arranged on the bottom frame portion, the light-emitting unit includes a light board arranged on the bottom frame portion and a plurality of light-emitting members arranged on the light board, and the light board has at least one positioning hole corresponding to the first alignment member.

[0016] Another technical means of the present invention is that the reflector is arranged on the lamp board and includes at least one second alignment member facing the lamp board, the second alignment member passes through the positioning hole of the lamp board and corresponds to the first alignment member of the back frame.

[0017] Another technical means of the present invention is that the backlight module further includes at least one locking member passing through the first alignment member and correspondingly locked to the second alignment member.

[0018] Another object of the present invention is to provide a display device comprising the aforementioned backlight module and a display panel disposed on the backlight module.

[0019] Another technical means of the present invention is that one of the fixing frame and the back frame further includes at least one limiting portion, and the edge of the display panel abuts against the at least one limiting portion.

[0020] The present invention is effective in that, by changing the connection structure between the fixed frame, the back frame, and the reflective sheet, the second positioning member can be positioned on the back frame or on the fixed frame. The back frame no longer needs to be designed with a larger opening to accommodate the hook used in the conventional technology. Therefore, water vapor infiltration will not occur, and the waterproof function is better. At the same time, eliminating the larger hook can also reduce the width of the frame to meet the demand for a narrow frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a perspective exploded view of a first preferred embodiment of a direct-lit backlight module with a reflector positioning design according to the present invention;

[0022] FIG2 is an exploded perspective view illustrating FIG1 from another angle;

[0023] FIG3 is a partial cross-sectional view illustrating the combined structure of a fixed frame, a back frame, and a reflective sheet;

[0024] FIG4 is a partial cross-sectional view illustrating that the fixing frame and the reflective sheet are fixed by a locking member;

[0025] FIG5 is a partial cross-sectional view of a preferred embodiment of the display device of the present invention;

[0026] FIG6 is a perspective exploded view of a second preferred embodiment of a direct-lit backlight module with a reflector positioning design according to the present invention;

[0027] FIG7 is an exploded perspective view illustrating FIG6 from another angle;

[0028] FIG8 is a partial enlarged view illustrating the area A in the frame of FIG6;

[0029] FIG9 is a partial cross-sectional view illustrating that the fixing frame and the reflective sheet are fixed by a locking member;

[0030] FIG10 is a partial enlarged view illustrating the area B in the frame of FIG6;

[0031] FIG11 is a partial cross-sectional view illustrating how the fixed frame and the back frame are fixed; and

[0032] FIG. 12 is a partial cross-sectional view illustrating how the fixing frame and the reflective sheet are fixed. DETAILED DESCRIPTION

[0033] The features and technical content of the related patent applications of this invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the accompanying drawings. Before proceeding with the detailed description, it should be noted that similar components are represented by the same reference numerals. In addition, directional terms such as "up," "down," "left," "right," "front," "back," "bottom," and "top" mentioned in the following embodiments are merely references to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes only and are not intended to limit the present invention.

[0034] Referring to Figures 1 and 2 , a first preferred embodiment of a direct-lit backlight module with a reflective sheet positioning design according to the present invention is shown. The module comprises a fixed frame 2, a back frame 3 coupled to the fixed frame 2, a light-emitting unit 4 disposed on the back frame 3, and a reflective sheet 5 disposed on the light-emitting unit 4. The fixed frame 2 has at least one coupling hole 21. The back frame 3 has at least one first positioning member 31, which is correspondingly disposed within the coupling hole 21 of the fixed frame 2. The reflective sheet 5 has at least one second positioning member 51, which is correspondingly coupled to the first positioning member 31 of the back frame 3. By modifying the coupling structure between the fixed frame 2, the back frame 3, and the reflective sheet 5, the second positioning member 51 can be positioned on the back frame 3. This eliminates the need for a larger opening in the back frame 3 to accommodate the hooks used in conventional designs. Consequently, moisture infiltration is prevented, resulting in improved waterproofing. Furthermore, eliminating the larger hooks reduces the width of the frame, meeting the requirements for a narrower frame.

[0035] In more detail, referring to Figures 1 and 3, the fixed frame 2 includes a side wall portion 22, and the coupling hole 21 is formed on the side wall portion 22. The back frame 3 includes a side frame portion 32, and the side frame portion 32 has a first surface 321 facing the side wall portion 22, and a second surface 322 opposite to the first surface 321. The first positioning member 31 forms a concave limiting area 33 on the second surface 322. The first positioning member 31 of the back frame 3 corresponds to the position of the limiting area 33, protruding from the first surface 321 of the side frame portion 32 toward the side wall portion 22. Therefore, the first positioning member 31 of the back frame 3 extends into the coupling hole 21 on the side wall portion 22 of the fixed frame 2. This design positions the back frame 3 and the fixed frame 2 on the outer side of the back frame 3 and snaps into the coupling hole 21 of the fixed frame 2. The fixed frame 2 does not need to be designed with a protruding positioning structure on the side wall portion 22, which can reduce the width of the frame.

[0036] The reflective sheet 5 includes a plurality of reflective portions 52 arranged in a matrix, and a frame portion 53 surrounding the reflective portions 52. The second positioning member 51 is disposed on the frame portion 53 and protrudes toward the side frame portion 32 of the back frame 3. It should also be noted that the second positioning member 51 of the reflective sheet 5 extends into the limiting area 33 of the first positioning member 31 of the back frame 3. With this design, the positioning positions of the reflective sheet 5 and the back frame 3 are positioned in the limiting area 33 on the inner side surface of the back frame 3. Since the limiting area 33 is recessed in the second surface 322, the back frame 3 does not need to be designed with a protruding positioning structure on the second surface 322, thereby reducing the width of the frame. In addition, in this embodiment, the first positioning member 31 of the back frame 3 or the second positioning member 51 of the reflective sheet 5 are both designed in the form of convex dots, which can effectively reduce the structural size and further enhance the effect of narrowing the frame.

[0037] Referring to Figure 4, the back frame 3 also includes a bottom frame portion 34 connected to the side frame portion 32, and at least one first alignment member 35 provided on the bottom frame portion 34. The light-emitting unit 4 includes a light board 41 provided on the bottom frame portion 34, and a plurality of light-emitting members 42 provided on the light board 41. The light board 41 has at least one positioning hole 411 corresponding to the first alignment member 35. Therefore, when the light board 41 is carried on the bottom frame portion 34, it can be sleeved on the first alignment member 35 through the positioning hole 411, so that the light board 41 is effectively positioned without being offset. In addition, the reflective sheet 5 is provided on the light board 41, and also includes at least one second alignment member 54 facing the light board 41, and the second alignment member 54 is aligned with the first alignment member 35 of the back frame 3. Therefore, when the reflector 5 is supported on the light board 41 , the reflector 5 can be coupled to the first alignment member 35 via the second alignment member 54 , so that the reflector 5 is effectively positioned without being offset.

[0038] As shown in FIG4 , when the backlight module of this preferred embodiment is assembled, the light board 41 of the light-emitting unit 4 is first set on the bottom frame portion 34 of the back frame 3, and the positioning hole 411 of the light board 41 is aligned with the first alignment member 35. Next, the reflective sheet 5 is set on the light board 41. Among them, the second alignment member 54 located at the bottom of the reflective sheet 5 will pass through the positioning hole 411 of the light board 41 and align with the first alignment member 35 of the back frame 3. In this embodiment, the first alignment member 35 is concave, so that the second alignment member 54 can be extended into the first alignment member 35. At the same time, the light-emitting members 42 on the light board 41 will be respectively extended into the reflecting portion 52 of the reflective sheet 5. Referring to FIG3 , at this time, the second positioning member 51 of the reflective sheet 5 will be extended into the limiting area 33 of the first positioning member 31 of the back frame 3. Referring to Figure 4 , multiple locking elements L are then passed from the bottom of the back frame 3 through the first alignment elements 35 and correspondingly locked onto the second alignment elements 54, completing the locking operation between the back frame 3 and the reflector 5. The interplay between the first alignment elements 35 and the second alignment elements 54, as well as the interplay between the first positioning elements 31 and the second positioning elements 51, prevents the reflector 5 from moving laterally and vertically relative to the back frame 3.

[0039] Referring to Figure 3 , an optical unit M comprising multiple optical films M0 is then placed on the reflective sheet 5. After the back frame 3, the light-emitting unit 4, the reflective sheet 5, and the optical unit M are assembled, the fixed frame 2 is then coupled to the back frame 3. At this point, the first positioning member 31 of the back frame 3 extends into the coupling hole 21 of the fixed frame 2, completing the assembly of the back frame 3.

[0040] The backlight module of the present invention has the following advantages through the above structural design:

[0041] First, the present invention utilizes a structure in which the second positioning member 51 of the reflective sheet 5 and the limiting area 33 on the inner side of the back frame 3 are formed into a structure in which a protrusion corresponds to a groove, and a structure in which the first positioning member 31 of the back frame 3 and the coupling hole 21 of the fixed frame 2 are formed into a structure in which a protrusion corresponds to a hole. Compared to the prior art, the combination of the hook structure on the reflective sheet 5 and the opening on the back frame 3 can effectively reduce the thickness of the frame to meet the narrow frame design, while also simplifying the structural design and facilitating rework. Furthermore, the hook structure in the prior art requires a hole to be opened in the back frame 3 for engagement, which is not conducive to the waterproof design of the light-emitting unit 4 inside the back frame 3. The back frame 3 of the present invention does not require any openings, has a better waterproof effect on the light-emitting unit 4, and eliminates the larger hook structure to achieve the effect of narrowing the frame.

[0042] Secondly, in addition to being coupled to each other via the first positioning member 31 and the second positioning member 51, the back frame 3 and the reflector 5 are also aligned with each other via the first aligning member 35 and the second aligning member 54 and then locked together via the locking member L, thereby providing a double limiting effect. This prevents the reflector 5 from being displaced relative to the back frame 3 due to thermal expansion and contraction.

[0043] As shown in Figure 5 , a display panel P is mounted on the backlight module of the present invention, forming a display device. The fixing frame 2 further includes a top wall 23 connected to the side walls 22 and a stopper 24 disposed on the top wall 23. The display panel P is mounted on the top wall 23, with its edge resting against the stopper 24 to prevent lateral displacement of the display panel P.

[0044] Referring to Figures 6 and 7, a second preferred embodiment of the direct-type backlight module with a reflective sheet positioning design of the present invention is shown, comprising a fixed frame 6, a back frame 7 combined with the fixed frame 6, a light-emitting unit 8 disposed on the back frame 7, and a reflective sheet 9 disposed on the light-emitting unit 8. The fixed frame 6 has a plurality of coupling holes 61. The back frame 7 has at least one first positioning member 71, and the first positioning member 71 is correspondingly disposed in one of the coupling holes 61 of the fixed frame 6. The reflective sheet 9 has at least one second positioning member 91, and the second positioning member 91 is correspondingly coupled to the other of the coupling holes 61 of the fixed frame 6. In other words, among the coupling holes 61 of the fixed frame 6, a portion of the coupling holes 61 is used for coupling with the first positioning member 71 of the back frame 7, while another portion of the coupling holes 61 is used for coupling with the second positioning member 91 of the reflective sheet 9.

[0045] In more detail, referring to Figure 8, the fixing frame 6 includes a side wall portion 62, and the coupling hole 61 is formed on the side wall portion 62. The coupling hole 61 is divided into a first coupling hole 61a and a second coupling hole 61b. The side wall portion 62 extends longitudinally along a first direction X1 away from the light-emitting unit 8, and extends laterally along a second direction X2 different from the first direction X1. The first positioning member 71 of the back frame 7 and the second positioning member 91 of the reflective sheet 9 are staggered along the first direction X1 or the second direction X2. In this embodiment, the first positioning member 71 and the second positioning member 91 are staggered along the second direction X2. The reflective sheet 9 includes a plurality of reflective portions 92 arranged in a matrix, and a frame portion 93 surrounding the reflective portion 92.

[0046] Through the above content, another embodiment of the backlight module can be provided, in which the back frame 7 is located on the outside of the fixed frame 6, which is different from the embodiment of Figures 1-5 in that the fixed frame 2 is located on the outside of the back frame 3, and the first positioning member 71 of the back frame 7 and the second positioning member 91 of the reflective sheet 9 are staggered along the first direction X1 or the second direction X2, avoiding the problem that the positions of the first combining hole 61a and the second combining hole 61b are too close, thereby causing the side wall portion 62 to be easily structurally weakened.

[0047] Referring to Figures 6 and 7 , the back frame 7 includes a side frame portion 72, a bottom frame portion 73 connected to the side frame portion 72, and at least one first alignment member 74 disposed on the bottom frame portion 73. The light unit 8 includes a light board 81 disposed on the bottom frame portion 73, and a plurality of light-emitting members 82 disposed on the light board 81. The light board 81 has at least one positioning hole 811 corresponding to the first alignment member 74. The reflective sheet 9 is disposed on the light board 81 and includes at least one second alignment member 94 facing the light board 81. The second alignment member 94 is aligned with the first alignment member 74 of the back frame 7.

[0048] Referring to Figure 9, when the backlight module of this preferred embodiment is assembled, the light board 81 of the light-emitting unit 8 is first set on the bottom frame portion 73 of the back frame 7, and the positioning hole 811 of the light board 81 is aligned with the first alignment member 74. Then, the reflective sheet 9 is set on the light board 81. Among them, the second alignment member 94 located at the bottom of the reflective sheet 9 will pass through the positioning hole 811 of the light board 81 and align with the first alignment member 74 of the back frame 7. In this embodiment, the first alignment member 74 is concave, so that the second alignment member 94 can be extended into the first alignment member 74. At the same time, the light-emitting members 82 on the light board 81 will respectively extend into the reflecting portion 92 of the reflective sheet 9. Next, a plurality of locking members L are passed through the first alignment member 74 from the bottom of the back frame 7 and correspondingly locked onto the second alignment member 94 , completing the locking operation of the back frame 7 and the reflective sheet 9 .

[0049] Next, an optical unit M is placed on the reflective sheet 9. As shown in Figure 10, the optical unit M has a plurality of optical films M0, and the frame portion 93 of the reflective sheet 9 has a plurality of stepped platforms 931 of different heights for bonding and fixing the optical films M0 of the optical unit M. In addition, as shown in Figure 6, the frame portion 93 also has a plurality of limit members 932 arranged at the corners to prevent the optical unit M from shifting. In some other embodiments, the reflective sheet 9 may also include at least one top support portion (not shown) extending upward from the junction of the reflective portion 92, and the optical unit M is supported by the frame portion 93 and the top support portion. In this way, when the size of the backlight module is large, better support can be provided for the central position of the optical unit M.

[0050] Referring to Figure 9, after the back frame 7, the light-emitting unit 8, the reflective sheet 9, and the optical unit M are assembled, the fixed frame 6 is then coupled to the back frame 7. At this point, the side wall portion 62 of the fixed frame 6 is located between the side frame portion 72 of the back frame 7 and the reflective sheet 9. As shown in Figure 11, the side frame portion 72 of the back frame 7 has a first surface 721 facing the side wall portion 62. The first positioning member 71 of the back frame 7 protrudes from the first surface 721 of the side frame portion 72 toward the side wall portion 62 and extends into the first coupling hole 61a of the fixed frame 6. As shown in Figure 12, the second positioning member 91 of the reflective sheet 9 is provided on the frame portion 93, protrudes toward the side wall portion 62, and extends into the second coupling hole 61b of the fixed frame 6. 6 , the top edge of the back frame 7 is formed with at least one notch 70, and at least a portion of the fixed frame 6 is positioned within the at least one notch 70. In this embodiment, there are multiple notches 70 located at the corners of the back frame 7. Furthermore, the fixed frame 6 is provided with protrusions 60 corresponding in shape to the notches 70 at the corners. When the fixed frame 6 and the back frame 7 are coupled, the protrusions 60 are positioned within the notches 70.

[0051] This preferred embodiment forms the coupling holes 61 on the fixed frame 6, allowing the first positioning member 71 of the back frame 7 and the second positioning member 91 of the reflector 9 to be positioned in combination with the coupling holes 61. This also reduces the thickness of the frame and facilitates rework. The back frame 7 does not need to be designed with a large opening to accommodate the hook used in conventional technology, thus providing a better waterproof effect for the light-emitting unit 8. Furthermore, this preferred embodiment further enhances the stability of the coupling between the back frame 7 and the fixed frame 6 by correspondingly coupling the notch 70 of the back frame 7 with the protrusion 60 of the fixed frame 6.

[0052] In summary, the present invention has a direct-lit backlight module with a reflector positioning design. By changing the coupling structure between the fixed frame, the back frame, and the reflector, the second positioning member can be positioned on the back frame or on the fixed frame. The back frame no longer needs to be designed with a large opening to accommodate the hook used in the conventional technology. Therefore, water vapor infiltration will not occur, and the waterproof function is better. At the same time, the elimination of the large hook can also reduce the width of the frame to meet the requirements of a narrow frame. In addition, it can be applied to automotive direct-lit backlight modules and utilize the narrow frame effect to increase the overall display area. The new coupling structure is also convenient for rework, while improving the internal waterproofness and extending the service life, and can indeed achieve the purpose of the present invention.

[0053] However, the above is only a preferred embodiment of the present invention and should not be used to limit the scope of implementation of the present invention. In other words, simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the patent of the present invention.

[0054] [Description of Symbols] 2 Fixing frame 21 Combining hole 22 Side wall 23 Top wall 24 Limiting portion 3 Back frame 31 First positioning member 32 Side frame 321 First surface 322 Second surface 33 Limiting area 34 Bottom frame 35 First alignment member 4 Light-emitting unit 41 Light board 411 Positioning hole 42 Light-emitting member 5 Reflective sheet 51 Second positioning member 52 Reflective portion 53 Frame surrounding portion 54 Second alignment member 6 Fixing frame 60 Protrusion 61 Combining hole 61a First combining hole 61b Second combining hole 62 Side wall 7 Back frame 70 Notch 71 First positioning member 72 Side frame 721 First surface 73 Bottom frame 74 First alignment member 8 Light-emitting unit 81 Light board 811 Positioning hole 82 Light-emitting member 9 Reflective sheet 91 Second positioning member 92 Reflective portion 93 Frame surrounding portion 931 Step platform 932 Limiting member 94 Second alignment elements A and B are shown in the frame M, optical unit M0, optical film L, locking element P, display panel X1, first direction X2, second direction.

Claims

1. A direct-type backlight module with a reflector positioning design, comprising: A fixing frame having at least one coupling hole; The back frame is combined with the fixed frame, wherein: The back frame has at least one first positioning member, and the first positioning member is correspondingly arranged in the combining hole of the fixing frame; A light emitting unit is disposed on the back frame; and The reflective sheet is disposed on the light-emitting unit and has at least one second positioning member, and the second positioning member is correspondingly combined with the first positioning member of the back frame.

2. The direct-lit backlight module with a reflector positioning design as claimed in claim 1, wherein: The fixing frame includes a side wall portion, the combining hole is formed on the side wall portion, the back frame includes a side frame portion, the side frame portion has a first surface facing the side wall portion, and a second surface opposite to the first surface, the first positioning member forms a concave limiting area on the second surface, the second positioning member of the reflective sheet protrudes toward the side frame portion, and extends into the limiting area of ​​the first positioning member of the back frame.

3. The direct-lit backlight module with a reflector positioning design as claimed in claim 2, wherein: The first positioning piece of the back frame corresponds to the position of the recessed area, protrudes from the first surface of the side frame portion toward the side wall portion, and the first positioning piece extends and is placed in the combining hole of the fixing frame.

4. A direct-type backlight module with a reflector positioning design, comprising: A fixing frame having a plurality of coupling holes; The back frame is combined with the fixed frame, wherein: The back frame has at least one first positioning member, and the first positioning member is correspondingly arranged in one of the combining holes of the fixing frame; A light emitting unit is disposed on the back frame; and The reflector is arranged on the light-emitting unit and has at least one second positioning member, and the second positioning member is correspondingly combined in the other one of the combining holes of the fixing frame.

5. The direct-lit backlight module with a reflector positioning design as claimed in claim 4, wherein: The fixed frame includes a side wall portion, and the combining hole is formed on the side wall portion. The back frame includes a side frame portion, and the side frame portion has a first surface facing the side wall portion. The side wall portion of the fixed frame is located between the side frame portion of the back frame and the reflective sheet. The combining hole is divided into a first combining hole and a second combining hole. The first positioning piece protrudes from the first surface of the side frame portion toward the side wall portion and extends into the first combining hole of the fixed frame. The second positioning piece of the reflective sheet protrudes toward the side wall portion and extends into the second combining hole of the fixed frame.

6. The direct-lit backlight module with a reflector positioning design as claimed in claim 4, wherein: The fixed frame includes a side wall portion, which extends longitudinally along a first direction away from the light-emitting unit and laterally along a second direction different from the first direction. The first positioning member of the back frame and the second positioning member of the reflective sheet are staggered along the first direction or the second direction.

7. The direct-lit backlight module with a reflector positioning design according to any one of claims 1 to 6, wherein: The reflective sheet comprises a plurality of reflective parts arranged in a matrix, and a frame part surrounding the reflective parts, and the second positioning piece is arranged on the frame part.

8. The direct-type backlight module with a reflector positioning design as described in claim 7 further comprises an optical unit, wherein the optical unit has a plurality of optical films, and the frame portion of the reflector has a plurality of stepped platforms of different heights for bonding and fixing the optical films of the optical unit.

9. The direct-lit backlight module with a reflector positioning design according to any one of claims 1 to 6, wherein: The top edge of the back frame is formed with at least one notch, and at least a portion of the fixing frame is extended and limitedly located in the at least one notch.

10. The direct-lit backlight module with a reflector positioning design according to any one of claims 1 to 6, wherein: The back frame includes a bottom frame portion and at least one first alignment member arranged on the bottom frame portion. The light-emitting unit includes a light board arranged on the bottom frame portion and a plurality of light-emitting members arranged on the light board. The light board has at least one positioning hole corresponding to the first alignment member.

11. The direct-lit backlight module with a reflector positioning design as claimed in claim 10, wherein: The reflective sheet is arranged on the lamp board and comprises at least one second alignment piece facing the lamp board. The second alignment piece passes through the positioning hole of the lamp board and corresponds to the first alignment piece of the back frame.

12. The direct-lit backlight module with a reflector positioning design as claimed in claim 11, wherein: The backlight module further comprises at least one locking member passing through the first alignment member and correspondingly locked on the second alignment member.

13. A display device, comprising the direct-lit backlight module with a reflector positioning design according to any one of claims 1 to 12, and a display panel disposed on the backlight module.

14. The display device according to claim 13, wherein: One of the fixing frame and the back frame further includes at least one limiting portion, and the edge of the display panel abuts against the at least one limiting portion.

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