Limiting device, backlight module and display device

Abstract

The present invention relates to a limiting device, a backlight module and a display device. The limiting device is used in conjunction with a fixing member to position a light guide plate. The limiting device is arranged between the light guide plate and the fixing member, and comprises an inner baffle wall, at least one spring sheet, and at least one pressing plate arranged along the fixing member. The spring sheet protrudes from the inner baffle wall toward the light guide plate, and abuts against the non-light incident surface of the light guide plate. The pressing plate extends from the inner baffle wall toward the light guide plate and is perpendicular to the inner baffle wall, and abuts against the light emitting surface of the light guide plate. The spring sheet has an elastic margin, so it can cope with the volume change of the light guide plate caused by thermal expansion and contraction. At the same time, by arranging the spring sheet and the pressing plate to extend in different directions, a two-dimensional positioning effect can be produced for the light guide plate. In addition, the limiting device has a simple structure and is close to a thin sheet-like design, so it can be applied to a backlight module with a narrow frame.

Description

Technical Field

[0001] The invention relates to a limiting device, in particular to a limiting device for a backlight module, and a backlight module and a display device comprising the limiting device. Background Art

[0002] The existing surface light source device usually includes components such as a supporting frame, a light emitting component, a light guide plate, an optical film group, etc. During assembly, the light emitting component and the light guide plate are first placed in appropriate positions in the supporting frame, and then the optical film group is placed on the light guide plate.

[0003] Among them, the light guide plate is usually made of optical grade PMMA (PolymethylMethacrylate, a polymer acrylic material), and PMMA has the property of swelling upon absorbing water. Therefore, when the surface light source device is placed in the atmosphere for a period of time, the light guide plate will absorb moisture in the atmosphere and expand or expand and contract with changes in temperature. When the light guide plate expands too much, it tends to jump out of the supporting frame, and when the light guide plate shrinks, it tends to loosen from the supporting frame. Therefore, the conventional surface light source device reserves a gap between the supporting frame and the anti-light surface of the light guide plate to serve as an expansion space for the light guide plate. However, in order to prevent the light guide plate from being displaced due to the gap formed with the supporting frame, the non-anti-light surface of the light guide plate is usually manually bonded to the supporting frame with tape to position the light guide plate in the supporting frame.

[0004] However, tape bonding may cause problems such as insufficient adhesion and debonding during long use, thereby increasing the production process and leading to increased costs. Summary of the invention

[0005] Therefore, an object of the present invention is to provide a limiting device that improves the above-mentioned deficiencies.

[0006] The position limiting device of the present invention is used in conjunction with a fixing member to position a light guide plate. The position limiting device is arranged between the light guide plate and the fixing member, and comprises an inner baffle wall arranged along the fixing member, at least one spring sheet, and at least one pressing plate. The spring sheet protrudes from the inner baffle wall toward the light guide plate and abuts against the non-light incident surface of the light guide plate. The pressing plate extends from the inner baffle wall toward the light guide plate and is perpendicular to the inner baffle wall, and abuts against the light emitting surface of the light guide plate.

[0007] Another technical means of the present invention is that the limiting device also includes a bottom plate connected to the bottom edge of the inner retaining wall and extending in the same direction as the pressing plate, and the bottom plate is arranged on the fixing member.

[0008] Another technical means of the present invention is that the limiting device further comprises a lug extending upward from the inner retaining wall and used for hanging at least one diaphragm.

[0009] Another technical means of the present invention is that the limiting device also includes a top wall connected to the top edge of the inner retaining wall and extending in the opposite direction of the pressing plate, and the top wall and the inner retaining wall are jointly positioned on the fixing member.

[0010] Another technical means of the present invention is that the fixing piece includes a body and a convex column extending upward from the body, wherein the top wall has a through hole and is sleeved on the convex column of the fixing piece through the through hole.

[0011] Another technical means of the present invention is that the limiting device also includes a lug extending upward from the top wall and used for hanging at least one diaphragm.

[0012] Another technical means of the present invention is that the limiting device also includes a top wall connected to the top edge of the inner retaining wall and extending in the opposite direction of the pressing plate, and an outer retaining wall connected to the top wall and extending in the same direction as the inner retaining wall. The inner retaining wall, the top wall, and the outer retaining wall together surround an accommodating space and are mounted on the fixing member through the accommodating space.

[0013] Another technical means of the present invention is that the fixing member includes a body and at least one protrusion protruding outward from the body, wherein the outer retaining wall has at least one through groove corresponding to the at least one protrusion.

[0014] Another technical means of the present invention is that the limiting device further includes a block protruding outward from the outer retaining wall for coupling to an external element.

[0015] Another technical means of the present invention is that the inner retaining wall extends along the X direction, and the spring sheet also extends along the X direction.

[0016] Another technical means of the present invention is that the inner retaining wall extends along the X direction, and the spring sheet extends along the Z direction, and the Z direction is perpendicular to the X direction. More preferably, a plurality of spring sheets are arranged at intervals along the X direction.

[0017] Another technical means of the present invention is that the spring sheet has a connecting section connected to the inner retaining wall and extending in a direction away from the inner retaining wall, and a top abutting section bent from the connecting section and parallel to the inner retaining wall, and the spring sheet abuts against the non-light incident surface of the light guide plate through the top abutting section.

[0018] Another technical means of the present invention is that the spring piece also has an extension section bent from the top section toward the inner retaining wall, and the extension section is connected or not connected to the inner retaining wall.

[0019] Another object of the present invention is to provide a backlight module and a display device including the above-mentioned limiting device.

[0020] The effect of the present invention is that, through the structural design of the limit device, the light guide plate can be adhered to the fixing member without using tape. Moreover, since the spring sheet has elastic margin, it can cope with the volume change of the light guide plate caused by thermal expansion and contraction. At the same time, the spring sheet and the pressing plate can be arranged to extend in different directions to produce a two-dimensional positioning effect on the light guide plate. In addition, the structure of the limit device is simple and close to a thin sheet, so it can be applied to a backlight module with a narrow frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a perspective view showing a first preferred embodiment of the limiting device of the present invention;

[0022] Figure 2 is a side view schematic diagram illustrating the use of the first preferred embodiment in combination with a fixing member to position a light guide plate;

[0023] Figure 3 is a three-dimensional diagram showing different forms of the spring piece in the first preferred embodiment;

[0024] Figure 4 is a perspective view showing a second preferred embodiment of the limiting device of the present invention;

[0025] Figure 5 is a side view schematic diagram illustrating the use of the second preferred embodiment;

[0026] Figure 6 is a side view schematic diagram showing a third preferred embodiment of the limiting device of the present invention;

[0027] Figure 7 is a side view schematic diagram illustrating the state of adding lugs in the third preferred embodiment;

[0028] Figure 8 is a side view schematic diagram showing a fourth preferred embodiment of the limiting device of the present invention;

[0029] Fig. 9 is a side view schematic diagram illustrating a fourth preferred embodiment in which a lug is added;

[0030] Fig.10 is a side view schematic diagram illustrating the fourth preferred embodiment being positioned on a fixing member in a hanging manner;

[0031] Fig.11 is a side view schematic diagram showing a fifth preferred embodiment of the position limiting device of the present invention;

[0032] Fig.12 is a side view schematic diagram illustrating a fifth preferred embodiment in which a lug is added;

[0033] Fig.13is a partial stereogram illustrating the fifth preferred embodiment with an additional through-groove;

[0034] Fig.14 is a partial stereogram illustrating the fifth preferred embodiment with a card block added; and

[0035] Fig.15 It is an auxiliary explanation Fig.14 A schematic side view of the middle card block and the external component combined. DETAILED DESCRIPTION

[0036] The relevant technical contents of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the accompanying drawings. Before the detailed description, it should be noted that similar elements are represented by the same numbers.

[0037] See also Figure 1 , which is a first preferred embodiment of the limiting device 2 of the present invention, comprises an inner retaining wall 21, a plurality of spring pieces 22 protruding from the inner retaining wall 21, and a pressing plate 23 protruding from the inner retaining wall 21 and perpendicular to the inner retaining wall 21. Figure 1 The number of the middle spring pieces 22 is two, but in actual implementation, one spring piece 22 may be matched with one pressing plate 23, and the present invention is not limited thereto.

[0038] See also Figure 2 The limiting device 2 of the present invention is used in conjunction with the fixing member A to position the light guide plate B, thereby assembling a backlight module. The limiting device 2 is disposed between the light guide plate B and the fixing member A. It should be noted that in this preferred embodiment and each preferred embodiment provided below, the fixing member A is a back panel. In addition, in this preferred embodiment, the limiting device 2 can be combined with an appropriate portion of the fixing member A by means of gluing, locking, or snapping. Figure 2 In the embodiment, the limiting device 2 is combined with the fixing member A through the adhesive member D.

[0039] See also Figure 1 and Figure 2 The spring piece 22 of the limit device 2 protrudes from the inner retaining wall 21 toward the light guide plate B and presses against the non-light incident surface B1 of the light guide plate B. The pressing plate 23 extends from the inner retaining wall 21 toward the light guide plate B and can press against the light emitting surface B2 of the light guide plate B.

[0040] In more detail, Figure 1As shown, the inner retaining wall 21 extends along the X direction, and the spring piece 22 also extends along the X direction. Each spring piece 22 has a connecting section 221 connected to the inner retaining wall 21 and extending in a direction away from the inner retaining wall 21, a top abutting section 222 bent from the connecting section 221 and substantially parallel to the inner retaining wall 21, and an extending section 223 bent from the top abutting section 222 toward the inner retaining wall 21. The spring piece 22 abuts against the non-light incident surface B1 of the light guide plate B through the top abutting section 222.

[0041] It should be noted that the extension section 223 of each elastic sheet 22 may be connected to or not connected to the inner retaining wall 21. Figure 1 In the embodiment, the extension section 223 of the spring sheet 22 is not connected to the inner baffle 21, so that the spring sheet 22 can have a larger elastic margin. In some embodiments, the extension section 223 of the spring sheet 22 can also be connected to the inner baffle 21, so that the spring sheet 22 can be slightly more rigid and not easy to break, and the spring sheet 22 can exert a stronger resistance force on the light guide plate B, thereby having a better positioning effect.

[0042] In addition, in some embodiments, Figure 3 As shown in the figure, the inner retaining wall 21 extends along the X direction, while the connecting section 221 and the top section 222 of the spring sheet 22 extend along the Z direction. The Z direction is perpendicular to the X direction. A plurality of spring sheets 22 are arranged at intervals along the X direction. In some embodiments, the spring sheets 22 are arranged at equal intervals, so that the top force applied by the spring sheets 22 to the light guide plate B is uniform, thereby having a better positioning effect. In some embodiments, each spring sheet 22 may only include the connecting section 221 and the top section 222, but not the spring sheets 221 and the top section 222. Figure 1 The extension section 223 is shown.

[0043] like Figure 2 As shown, the limiting device 2 can be set to press against the non-light incident surface B1 of the light guide plate B through the setting of the spring sheet 22 to provide a horizontal limiting effect, and can be set to press against the light emitting surface B2 of the light guide plate B through the setting of the pressing plate 23 to provide a vertical limiting effect. The spring sheet 22 has elastic margin, which can cope with the volume change of the light guide plate B caused by thermal expansion and contraction. At the same time, the setting of the spring sheet 22 and the pressing plate 23 extending in different directions can produce a two-dimensional positioning effect on the light guide plate B. When Figure 2 When a display panel (not shown) is arranged on the light guide plate B of the backlight module, a display device is formed.

[0044] See also Figure 4 , which is a second preferred embodiment of the limiting device 3 of the present invention, comprises an inner retaining wall 31, a plurality of spring pieces 32 protruding from the inner retaining wall 31, a pressing plate 33 protruding from the inner retaining wall 31 and perpendicular to the inner retaining wall 31, and a lug 34 extending upward from the inner retaining wall 31.

[0045] See also Figure 5 In this preferred embodiment, in addition to the horizontal and vertical limiting effects on the light guide plate B by the spring sheet 32 ​​and the pressing plate 33, the lug 34 can hang at least one film C. A hole C1 is formed on the edge of the film C. When the film C is set at the light emitting position of the light guide plate B, the lug 34 can pass through the hole C1 of the film C, and the film C can be positioned at the same time.

[0046] See also Figure 6 , which is a third preferred embodiment of the limiting device 4 of the present invention, comprises an inner retaining wall 41, a plurality of spring pieces 42 (only one is shown due to the viewing angle) protruding from the inner retaining wall 41, a pressing plate 43 protruding from the inner retaining wall 41 and perpendicular to the inner retaining wall 41, and a bottom plate 44 connected to the bottom edge of the inner retaining wall 41 and extending in the same direction as the pressing plate 43.

[0047] In this preferred embodiment, in addition to the horizontal and vertical limiting effects on the light guide plate B by the spring 42 and the pressing plate 43, the bottom plate 44 and the inner baffle 41 can be combined with the fixing member A by the adhesive member D, thereby improving the combination stability between the limiting device 4 and the fixing member A.

[0048] In addition, in some implementations, Figure 7 As shown, the limiting device 4 further includes a lug 45 extending upward from the inner retaining wall 41 for positioning the membrane C disposed above the light guide plate B.

[0049] See also Figure 8 , which is a fourth preferred embodiment of the position limiting device 5 of the present invention, comprises an inner retaining wall 51, a plurality of spring pieces 52 (only one is shown due to the viewing angle) protruding from the inner retaining wall 51, a pressing plate 53 protruding from the inner retaining wall 51 and perpendicular to the inner retaining wall 51, and a top wall 54 connected to the top edge of the inner retaining wall 51 and extending in the opposite direction of the pressing plate 53. In this preferred embodiment, the top wall 54 and the inner retaining wall 51 can be combined with the fixing member A by an adhesive member D, thereby improving the combination stability between the position limiting device 5 and the fixing member A.

[0050] In addition, in some implementations, Fig. 9 As shown, the limiting device 5 further includes a lug 55 extending upward from the top wall 54 to position the film C disposed above the light guide plate B.

[0051] In other implementations, such as Fig.10As shown, the fixing member A includes a body A1 and a convex column A2 extending upward from the body A1, and the top wall 54 has a through hole 541, and the top wall 54 is sleeved on the convex column A2 of the fixing member A through the through hole 541. Through the above method, the limiting device 5 can be positioned on the fixing member A in a hanging manner without using an adhesive member D. In addition, the convex column A2 can also be used for hanging the film C disposed above the light guide plate B, and at the same time provide a positioning function for the film C.

[0052] See also Fig.11 , which is a fifth preferred embodiment of the position limiting device 6 of the present invention, comprises an inner retaining wall 61, a plurality of spring pieces 62 (only one is shown due to the viewing angle) protruding from the inner retaining wall 61, a pressing plate 63 protruding from the inner retaining wall 61 and perpendicular to the inner retaining wall 61, a top wall 64 connected to the top edge of the inner retaining wall 61 and extending in the opposite direction of the pressing plate 63, and an outer retaining wall 65 connected to the top wall 64 and extending in the same direction as the inner retaining wall 61. The inner retaining wall 61, the top wall 64, and the outer retaining wall 65 together surround an accommodating space 60, and are sleeved on the fixing member A through the accommodating space 60.

[0053] In this preferred embodiment, the overall structure of the limiting device 6 is an inverted U-shape, and can be directly and firmly hung on the fixing member A without any adhesive member D, thereby reducing the assembly process and reducing the production cost. In some embodiments, there is a distance between the end of the inner retaining wall 61 away from the top wall 64 and the end of the outer retaining wall 65 away from the top wall 64, and the distance is smaller than the width of the top wall 64, so that the inner retaining wall 61 and the outer retaining wall 65 have a clamping force relative to the fixing member A, thereby making the limiting device 6 more firmly clamped on the fixing member A and not easy to fall off.

[0054] In addition, in some implementations, Fig.12 As shown, the limiting device 6 further includes a lug 66 extending upward from the top wall 64 to position the film C disposed above the light guide plate B.

[0055] In other implementations, such as Fig.13 As shown, the fixing member A includes a body A1 and a plurality of protrusions A3 protruding outward from the body A1, and the outer retaining wall 65 has a plurality of through grooves 651 corresponding to the protrusions A3. Through the above-mentioned method, the lateral displacement of the limiting device 6 can be prevented, and the limiting device 6 can be prevented from coming out along the Z direction relative to the fixing member A, thereby improving the combination stability between the limiting device 6 and the fixing member A.

[0056] In other implementations, such as Fig.14 As shown, the limiting device 6 also includes a block 67 protruding outward from the outer retaining wall 65. Fig.15 The block 67 is used to be combined with an external element E (such as a rubber frame), thereby further improving the combination stability of the limiting device 6 in the overall structure.

[0057] It should be noted that the stoppers in the preferred embodiments of the present invention are mainly made of metal and are formed by directly cutting and bending a piece of metal plate. Therefore, during manufacturing, a piece of metal plate can be processed into various implementation forms shown in different embodiments according to various sizes, models, or application environments.

[0058] In summary, the limiting device of the present invention can be pressed against the non-light incident surface of the light guide plate by the setting of the spring sheet to provide a limiting effect in the horizontal direction, and can be pressed against the light emitting surface of the light guide plate by the setting of the pressing plate to provide a limiting effect in the vertical direction. In addition, the effect of positioning the diaphragm can also be achieved at the same time by the setting of the lug. In addition, the combination between the limiting device and the fixing part can be made more convenient and stable by the design of the through grooves and the blocks on the outer retaining wall, thereby shortening the assembly time, streamlining the overall structure and making the design close to a thin sheet, so as to further reduce the occupied space for application in backlight modules with narrow frames.

[0059] 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, all simple equivalent changes and modifications made according to the claims and description of the present invention are still within the patent coverage of the present invention.

[0060] [List of Reference Numerals]

[0061] 2 Limiting device

[0062] 21 Internal retaining wall

[0063] 22 Shrapnel

[0064] 221 Connection segment

[0065] 222 Top section

[0066] 223 extension

[0067] 23 Pressed Plate

[0068] 3 Limiting device

[0069] 31 Internal retaining wall

[0070] 32 Shrapnel

[0071] 33 Pressed Plate

[0072] 34 Lugs

[0073] 4 Limiting device

[0074] 41 Internal retaining wall

[0075] 42 Shrapnel

[0076] 43 Pressed Plate

[0077] 44 Base Plate

[0078] 45 Lug

[0079] 5 Limiting device

[0080] 51 Internal retaining wall

[0081] 52 Shrapnel

[0082] 53 Pressed Plate

[0083] 54 Top wall

[0084] 541 Through hole

[0085] 55 Lug

[0086] 6 Limit device

[0087] 60 Storage Space

[0088] 61 Internal retaining wall

[0089] 62 Shrapnel

[0090] 63 Pressed Plate

[0091] 64 Top wall

[0092] 65 External retaining wall

[0093] 651 Slot

[0094] 66 Lug

[0095] 67 Card Block

[0096] A. Fixing parts

[0097] A1 body

[0098] A2 Boss

[0099] A3 Bump

[0100] B Light guide plate

[0101] B1 Non-light incident surface

[0102] B2 Light emitting surface

[0103] C Diaphragm

[0104] C1 Hole

[0105] D Adhesive

[0106] E External components.

Claims

1. A limiting device, which is used in conjunction with a fixing member to position a light guide plate, wherein the limiting device is disposed between the light guide plate and the fixing member, the limiting device is fixedly combined with the fixing member, and the fixing member is a back plate, characterized in that: The limiting device comprises: An inner retaining wall, which is arranged along the fixing member; A plurality of spring pieces, which protrude from the inner retaining wall toward the light guide plate and abut against the non-light incident surface of the light guide plate; and at least one pressing plate, which extends from the inner baffle wall toward the light guide plate and is perpendicular to the inner baffle wall and is pressed against the light emitting surface of the light guide plate, The inner retaining wall extends along the X direction, the spring sheet extends along the Z direction, the Z direction is perpendicular to the X direction, the multiple spring sheets are arranged at equal intervals along the X direction, the spring sheet has a connecting section connected to the inner retaining wall and extending in a direction away from the inner retaining wall, and a top abutting section bent from the connecting section and parallel to the inner retaining wall, and the spring sheet abuts against the non-light incident surface of the light guide plate through the top abutting section.

2. The limiting device according to claim 1, characterized in that: It also comprises a bottom plate which is connected to the bottom edge of the inner retaining wall and extends in the same direction as the pressing plate, and the bottom plate is arranged on the fixing member.

3. The limiting device according to claim 1 or 2, characterized in that: The utility model also comprises a lug which extends upward from the inner baffle wall and is used for hanging at least one diaphragm.

4. The limiting device according to claim 1, characterized in that: It also comprises a top wall connected to the top edge of the inner retaining wall and extending in the opposite direction of the pressing plate, wherein the top wall and the inner retaining wall are positioned on the fixing member together.

5. The limiting device according to claim 4, characterized in that: The fixing member includes a body and a convex column extending upward from the body, wherein the top wall has a through hole, and the top wall is sleeved on the convex column of the fixing member through the through hole.

6. The limiting device according to claim 4 or 5, characterized in that: The utility model also comprises a lug extending upward from the top wall and used for hanging at least one membrane.

7. The limiting device according to claim 1, characterized in that: It also includes a top wall connected to the top edge of the inner retaining wall and extending in the opposite direction of the pressing plate, and an outer retaining wall connected to the top wall and extending in the same direction as the inner retaining wall. The inner retaining wall, the top wall and the outer retaining wall together surround an accommodating space and are mounted on the fixing member through the accommodating space.

8. The limiting device according to claim 7, characterized in that: The fixing member includes a body and at least one protrusion protruding outward from the body, wherein the outer retaining wall has at least one through groove corresponding to the at least one protrusion.

9. The limiting device according to claim 8, characterized in that: It also comprises a clamping block protruding outward from the outer retaining wall and used for being combined with an external element.

10. The limiting device according to any one of claims 7 to 9, characterized in that: The utility model also comprises a lug extending upward from the top wall and used for hanging at least one membrane.

11. The limiting device according to claim 1, characterized in that: The elastic sheet further comprises an extension section bent from the top abutting section toward the inner retaining wall, and the extension section is connected or not connected to the inner retaining wall.

12. A backlight module, characterized in that: Include: A back plate having a bottom plate and at least one side wall; a light guide plate, which is supported on the bottom plate of the back plate; and The limiting device according to any one of claims 1 to 11 is arranged between the side wall of the back plate and the light guide plate.

13. A display device, characterized in that: Include: The backlight module according to claim 12; and The display panel is arranged above the light guide plate.

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