TWI706203B - Limiting device, backlight module, and display device - Google Patents

Abstract

A limiting device is used in conjunction with a fixing member to position a light guide plate. The limiting device is disposed between the light guide plate and the fixing member, and includes an inner retaining wall disposed along the fixing member, at least one elastic piece and at least one press plate. The elastic piece protrudes from the inner retaining 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 retaining wall toward the light guide plate and is perpendicular to the inner retaining wall, and can press the light emitting surface of the light guide plate. The elastic piece has an elastic margin due to a volume change caused by the thermal expansion and contraction of the light guide plate, and a different direction of extension of the elastic piece and the pressing plate can be used to generate a two-dimensional positioning effect on the light guide plate. Furthermore, the limiting device has a compact structure and is close to a flaky design, and can be applied to a backlight module with a narrow frame.

Description

Limiting device, backlight module and display device

The present invention relates to a limiting device, in particular to a limiting device for a backlight module, and a backlight module and a display device including the limiting device.

The existing surface light source device usually includes a supporting frame, a light-emitting element, a light guide plate, an optical film group and other elements. When assembling, the light-emitting element and the light guide plate are placed in an appropriate position in the supporting frame, and then The optical film group is placed on the light guide plate.

However, most of the light guide plates are made of optical grade PMMA (Polymethyl Methacrylate, a polymer acrylic material), and PMMA has the property of absorbing water and swelling. When the surface light source device is placed in the atmosphere for a while In the future, the light guide plate will absorb moisture in the atmosphere and expand; or it will expand and contract with temperature. If the light guide plate expands too much, it may fall off from the supporting frame, and if the light guide plate shrinks in cold, it may become loose in the supporting frame. Therefore, the conventional surface light source device reserves a gap between the receiving frame and the light-incident surface of the light guide plate to serve as the expansion space of the light guide plate, but to prevent the light guide plate from being easily generated due to the gap formed with the supporting frame For displacement, the position of the non-reflecting light-incident surface of the light guide plate is usually manually glued to the supporting frame with tape to position the light guide plate in the supporting frame.

However, the use of adhesive tape may cause insufficient adhesion, long use period and de-adhesive, and increase the production process leading to increased costs.

Therefore, the object of the present invention is to provide a limiting device that improves the above-mentioned deficiency.

The limiting device of the present invention is used in conjunction with a fixing piece to position a light guide plate. The limiting device is arranged between the light guiding plate and the fixing piece, and includes an inner retaining wall arranged along the fixing piece, and at least one Shrapnel, and at least one pressing plate. Wherein, the elastic sheet protrudes from the inner retaining 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 barrier wall to the direction of the light guide plate, is perpendicular to the inner barrier wall, and can be pressed against the light emitting surface of the light guide plate.

Another technical means of the present invention is that the limiting device further 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.

Another technical means of the present invention is that the limiting device further includes a lug extending upward from the inner retaining wall for hanging at least one diaphragm.

Another technical means of the present invention is that the limiting device further includes a top wall connected to the top edge of the inner retaining wall and extending opposite to the pressing plate, and the top wall and the inner retaining wall are co-located on the On the fixed part.

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

Another technical means of the present invention is that the limiting device further includes a lug extending upward from the top wall for hanging at least one diaphragm.

Another technical means of the present invention is that the limiting device further includes a top wall connected to the top edge of the inner retaining wall and extending opposite to the pressing plate, and a top wall connected to the top wall and connected to the inner retaining wall. The outer retaining wall extends in the same direction, the inner retaining wall, the top wall, and the outer retaining wall collectively surround an accommodating space, and the accommodating space is sleeved on the fixing member.

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

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

Another technical means of the present invention is that the inner retaining wall extends along an X direction, and the elastic piece also extends along the X direction.

Another technical means of the present invention is that the inner retaining wall extends along an X direction, and the elastic piece extends along a Z direction. More preferably, the plurality of shrapnels are arranged at intervals along the X direction.

Another technical means of the present invention is that the elastic piece has a connecting section connected to the inner retaining wall and extending away from the inner retaining wall, and a connecting section bent by the connecting section and almost in line with the inner retaining wall The parallel abutting section, the elastic piece is pressed against the non-light-incident surface of the light guide plate by the abutting section.

Another technical means of the present invention is that the elastic sheet further has an extension section bent from the abutting section toward the inner retaining wall, and the extension section may be connected or not connected to the inner retaining wall.

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

The effect of the present invention is that by using the structural design of the limiting device, there is no need to use adhesive tape to fix the light guide plate on the fixing member, and the elastic sheet has elastic margin due to the expansion and contraction of the light guide plate due to heat The volume change, coupled with the different extension directions of the elastic sheet and the pressing plate, can produce a two-dimensional positioning effect on the light guide plate. Furthermore, the structure of the limiting device is simple and close to a sheet-like design, which can be applied to a backlight module with a narrow frame.

The features and technical content of the related patent applications of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Before detailed description, it should be noted that similar elements are represented by the same numbers.

1 is a first preferred embodiment of the limiting device 2 of the present invention, including an inner retaining wall 21, a plurality of elastic pieces 22 protruding from the inner retaining wall 21, and a protruding from the inner retaining wall 21 And it is perpendicular to the pressing plate 23 of the inner retaining wall 21. In FIG. 1, the number of elastic pieces 22 is two, but in actual implementation, one elastic piece 22 can be matched with a pressing plate 23, and it is not limited thereto.

Referring to FIG. 2, the limiting device 2 of the present invention is used in conjunction with a fixing member A to position a light guide plate B to be assembled into a backlight module. The limiting device 2 is disposed between the light guide plate B and the fixing member A between. It should be noted that, in this preferred embodiment and the following preferred embodiments, the fixing member A is a back plate. In addition, in this preferred embodiment, the limiting device 2 can be combined with an appropriate part of the fixing member A by pasting, locking, or buckling. In FIG. 2, the limiting device 2 is An adhesive piece D is combined with the fixing piece A.

1 and 2, the elastic sheet 22 of the limiting device 2 protrudes from the inner retaining wall 21 in the direction of the light guide plate B, and abuts 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 be pressed against the light emitting surface B2 of the light guide plate B.

In more detail, as shown in FIG. 1, the inner retaining wall 21 extends along an X direction, and the elastic piece 22 also extends along the X direction. Each elastic piece 22 has a connecting section 221 connected to the inner retaining wall 21 and extending away from the inner retaining wall 21, and a connecting section 221 bent by the connecting section 221 and substantially parallel to the inner retaining wall 21 Abutting section 222, and an extension section 223 bent from the abutting section 222 to the direction of the inner retaining wall 21, the elastic sheet 22 is pressed against the non-light-incident surface of the light guide plate B by the abutting section 222 B1.

It should be particularly noted that the extension 223 of each elastic piece 22 may be connected or not connected to the inner retaining wall 21. In FIG. 1, the extension section 223 of the elastic piece 22 is not connected to the inner retaining wall 21. In this way, the elastic piece 22 can have a larger elastic margin. In some embodiments, the extension section 223 of the elastic piece 22 may also be connected to the inner retaining wall 21, so that the elastic piece 22 can be slightly increased in rigidity and is not easy to break, and the elastic piece 22 is not easily broken. The resisting force that can be applied to the light guide plate B is stronger, and it has a better positioning effect.

In addition, in some embodiments, as shown in FIG. 3, the inner retaining wall 21 extends along the X direction, and the connecting section 221 and the abutting section 222 of the elastic sheet 22 extend along a Z direction. Direction extension. The plurality of elastic pieces 22 are arranged at intervals along the X direction. In some embodiments, the elastic pieces 22 are arranged equidistantly, so that the pressing force of the elastic pieces 22 on the light guide plate B is uniform , And has a better positioning effect. In these embodiments, each elastic piece 22 may have only the connecting section 221 and the abutting section 222 without the extension section 223 as shown in FIG. 1.

As shown in FIG. 2, the limiting device 2 can abut against the non-light-incident surface B1 of the light guide plate B through the arrangement of the elastic sheet 22 to provide a horizontal limiting effect, and the setting of the pressing plate 23, It is pressed against the light-emitting surface B2 of the light guide plate B to provide a limit effect in the vertical direction. The elastic sheet 22 has an elastic margin in response to the volume change of the light guide plate B due to thermal expansion and contraction, and in conjunction with the different extension directions of the elastic sheet 22 and the pressing plate 23, the light guide plate B can be two-dimensionally oriented Positioning effect. When the backlight module in FIG. 2 is provided with a display panel (not shown) on the light guide plate B, it is a display device.

4, it is a second preferred embodiment of the limiting device 3 of the present invention, which includes an inner retaining wall 31, a plurality of elastic pieces 32 protruding from the inner retaining wall 31, and one protruding from the inner retaining wall 31 and A pressing plate 33 perpendicular to the inner retaining wall 31 and a lug 34 extending upward from the inner retaining wall 31.

Referring to FIG. 5, in this preferred embodiment, in addition to the horizontal and vertical limiting effects on the light guide plate B through the elastic sheet 32 and the pressing plate 33, the design of the lug 34 can be Hang at least one diaphragm C. A hole C1 is formed on the edge of the diaphragm C. When the diaphragm 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 diaphragm C, and the diaphragm C can be positioned at the same time. Effect.

6 is a third preferred embodiment of the limiting device 4 of the present invention, including an inner retaining wall 41, a plurality of elastic pieces 42 protruding from the inner retaining wall 41 (only one is shown due to the viewing angle), a A pressing board 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 board 43.

In this preferred embodiment, in addition to the horizontal and vertical limiting effects on the light guide plate B through the elastic sheet 42 and the pressing plate 43, both the bottom plate 44 and the inner retaining wall 41 can be pasted D is combined with the fixing member A to improve the binding stability between the limiting device 4 and the fixing member A.

In addition, in some embodiments, as shown in FIG. 7, the limiting device 4 further includes a lug 45 extending upward from the inner retaining wall 41 to be positioned above the light guide plate B The diaphragm C.

Referring to FIG. 8, a fourth preferred embodiment of the limiting device 5 of the present invention includes an inner retaining wall 51, a plurality of elastic pieces 52 projecting from the inner retaining wall 51 (only one is shown due to the viewing angle), a A pressing board 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 opposite to the pressing board 53. In this preferred embodiment, both the top wall 54 and the inner retaining wall 51 can be combined with the fixing member A by an adhesive D, which improves the stability of the combination between the limiting device 5 and the fixing member A.

In addition, in some embodiments, as shown in FIG. 9, the limiting device 5 further includes a lug 55 extending upward from the top wall 54 for positioning the upper portion of the light guide plate B Diaphragm C.

In other embodiments, as shown in FIG. 10, the fixing member A includes a main body A1 and a protrusion A2 extending upward from the main body A1, and the top wall 54 has a through hole 541, and the top wall 54 It is sleeved on the protrusion 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 the adhesive member D. In addition, the protruding column A2 can also be used for hanging the film C arranged above the light guide plate B, and at the same time provide the function of positioning the film C.

Refer to Figure 11, which is a fifth preferred embodiment of the limiting device 6 of the present invention, which includes an inner retaining wall 61, a plurality of elastic pieces 62 protruding from the inner retaining wall 61 (only one is shown due to the viewing angle), a 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 opposite to the pressing plate 63, and a top wall 64 connected to The top wall 64 and the outer retaining wall 65 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 jointly surround an accommodating space 60, and the accommodating space 60 is sleeved on the fixing member A.

In this preferred embodiment, the overall structure of the limiting device 6 is an inverted U shape, which can be directly and stably hung on the fixing member A without using any adhesive D, which can reduce the assembly process and reduce 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 that of the top wall 64 The width enables the inner retaining wall 61 and the outer retaining wall 65 to have a clamping force with respect to the fixing member A, so that the limiting device 6 can be clamped on the fixing member A more firmly and not easily falling off.

In addition, in some embodiments, as shown in FIG. 12, the limiting device 6 further includes a lug 66 extending upward from the top wall 64 for positioning the light guide plate B above Diaphragm C.

In other embodiments, as shown in FIG. 13, 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 plural numbers corresponding to the The slot 651 of the bump A3 is described. Through the above method, the lateral displacement of the limiting device 6 can be prevented, and the limiting device 6 can be prevented from escaping in the Z direction relative to the fixing member A, and the combination between the limiting device 6 and the fixing member A can be stabilized. Sex.

In other embodiments, as shown in FIG. 14, the limiting device 6 further includes a blocking block 67 protruding outward from the outer retaining wall 65. Referring to FIG. 15, the block 67 is used to be combined with an external element E (such as a plastic frame), thereby further improving the stability of the combination of the limiting device 6 in the overall structure.

It should be particularly noted that the preferred embodiments of the present invention are mainly made of metal materials, and are formed by directly cutting and bending a piece of metal plate. Therefore, various sizes can be determined during manufacturing. , Model, or application environment, the various embodiments shown in different embodiments are processed by a piece of metal plate.

To sum up, the limiting device of the present invention can resist against the non-light incident surface of the light guide plate through the arrangement of the elastic sheet, and provide a horizontal limiting effect, while the arrangement of the pressing plate is pressed against The light-emitting surface of the light guide plate provides a vertical limit effect. If it is matched with the setting of the lug, the effect of positioning the diaphragm can be achieved at the same time. In addition, the through slot on the outer retaining wall and the design of the block can make the combination between the limiting device and the fixing member more convenient and stable, can shorten the assembly time, and the overall structure is streamlined and close to The thin-shaped design can reduce the space occupied and is applied to models with narrow bezels.

However, the foregoing are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent.

2: limit device 21: inner retaining wall 22: shrapnel 221: connection segment 222: Top Arrival 223: Extension 23: Press plate 3: limit device 31: Internal retaining wall 32: shrapnel 33: Press plate 34: lug 4: limit device 41: Internal retaining wall 42: shrapnel 43: Press plate 44: bottom plate 45: lug 5: Limiting device 51: inner retaining wall 52: shrapnel 53: Press plate 54: top wall 541: Through Hole 55: lug 6: Limiting device 60: accommodation space 61: Internal retaining wall 62: shrapnel 63: Press plate 64: top wall 65: external retaining wall 651: piercing 66: lug 67: stuck A: Fixed parts A1: body A2: convex column A3: bump B: Light guide plate B1: non-glossy surface B2: Glossy surface C: diaphragm C1: Hole D: Sticker E: External components

Figure 1 is a perspective view of the first preferred embodiment of the limiting device of the present invention; 2 is a schematic side view illustrating the use of the first preferred embodiment and a fixing member to position a light guide plate; Figure 3 is a perspective view showing the different forms of the shrapnel in the first preferred embodiment; Figure 4 is a perspective view of the second preferred embodiment of the limiting device of the present invention; Figure 5 is a schematic side view illustrating the use of the second preferred embodiment; Fig. 6 is a schematic side view showing the third preferred embodiment of the limiting device of the present invention; Figure 7 is a schematic side view illustrating the addition of a lug in the third preferred embodiment; 8 is a schematic side view, which is a fourth preferred embodiment of the limiting device of the present invention; Figure 9 is a schematic side view illustrating the addition of a lug in the fourth preferred embodiment; 10 is a schematic side view illustrating that the fourth preferred embodiment can be positioned on the fixing member in a hanging manner; 11 is a schematic side view, which is a fifth preferred embodiment of the limiting device of the present invention; Figure 12 is a schematic side view illustrating the addition of a lug in the fifth preferred embodiment; Figure 13 is a partial perspective view illustrating the form of adding a slot through the fifth preferred embodiment; FIG. 14 is a partial perspective view illustrating the form of adding a blocking block in the fifth preferred embodiment; and FIG. 15 is a schematic side view to assist in explaining the combination of the clamping block and an external component in FIG. 14.

2: limit device

21: inner retaining wall

22: shrapnel

221: connection segment

222: Top Arrival

223: Extension

23: Press plate

Claims (19)

A limiting device is used in conjunction with a fixing piece to position a light guide plate, the limiting device is arranged between the light guiding plate and the fixing piece, and includes: an inner retaining wall arranged along the fixing piece; at least one An elastic piece protrudes from the inner retaining wall toward the light guide plate and abuts against the non-light incident surface of the light guide plate, wherein the elastic piece has a direction connected to the inner retaining wall and away from the inner retaining wall An extended connecting section, and an abutting section that is bent by the connecting section and which is substantially parallel to the inner retaining wall, the elastic piece is pressed against the non-light-incident surface of the light guide plate by the abutting section; and at least one The pressing plate extends from the inner barrier wall to the direction of the light guide plate, is perpendicular to the inner barrier wall, and can be pressed against the light emitting surface of the light guide plate. The limiting device according to item 1 of the scope of patent application further 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. The limiting device according to item 1 or 2 of the scope of patent application further includes a lug extending upward from the inner retaining wall for hanging at least one diaphragm. The limiting device according to item 1 of the scope of patent application further includes a top wall connected to the top edge of the inner retaining wall and extending opposite to the pressing plate, and the top wall and the inner retaining wall are co-located on the On the fixed part. According to the limiting device described in item 4 of the scope of patent application, the fixing member includes a main body and a protruding column extending upward from the main body, wherein the top wall has a through hole and is sleeved in On the boss of the fixing piece. The limiting device according to item 4 or 5 of the scope of patent application further includes a lug extending upward from the top wall for hanging at least one diaphragm. The limiting device according to item 1 of the scope of patent application further includes a top wall connected to the top edge of the inner retaining wall and extending opposite to the pressing plate, and a top wall connected to the top wall and connected to the inner retaining wall. The outer retaining wall extends in the same direction, the inner retaining wall, the top wall, and the outer retaining wall collectively surround an accommodating space, and the accommodating space is sleeved on the fixing member. According to the limiting device described in item 7 of the scope of patent application, the fixing member includes a body, and at least one protrusion protruding outward from the body, wherein the outer retaining wall has at least a pair of penetrations corresponding to the protrusion groove. According to the limit device described in item 8 of the scope of patent application, it also includes a block protruding outward from the outer retaining wall to be combined with an external element. The limiting device according to any one of items 7 to 9 in the scope of the patent application further includes a lug extending upward from the top wall for hanging at least one diaphragm. According to the limiting device described in item 1 of the scope of patent application, the inner retaining wall extends along an X direction, and the elastic piece also extends along the X direction. According to the limiting device described in item 1 of the scope of patent application, the inner retaining wall extends along an X direction, and the elastic piece extends along a Z direction. According to the limit device described in item 12 of the scope of patent application, a plurality of elastic pieces are arranged at intervals along the X direction. According to the limiting device described in item 1 of the scope of patent application, the elastic piece also has a The abutting section is an extension section bent toward the inner retaining wall, and the extension section may be connected or not connected to the inner retaining wall. A limiting device is used in conjunction with a fixing piece to position a light guide plate, the limiting device is arranged between the light guiding plate and the fixing piece, and includes: an inner retaining wall arranged along the fixing piece; at least one The elastic sheet protrudes from the inner retaining wall in the direction of the light guide plate and abuts against the non-light-incident surface of the light guide plate; at least one pressing plate extends from the inner retaining wall to the direction of the light guide plate and is perpendicular to the light guide plate The inner retaining wall can be pressed against the light emitting surface of the light guide plate; and a lug extending upward from the inner retaining wall for hanging at least one diaphragm. A limiting device is used in conjunction with a fixing piece to position a light guide plate, the limiting device is arranged between the light guiding plate and the fixing piece, and includes: an inner retaining wall arranged along the fixing piece; at least one The elastic sheet protrudes from the inner retaining wall in the direction of the light guide plate and abuts against the non-light-incident surface of the light guide plate; at least one pressing plate extends from the inner retaining wall to the direction of the light guide plate and is perpendicular to the light guide plate An inner retaining wall that can be pressed against the light-emitting surface of the light guide plate; and a top wall connected to the top edge of the inner retaining wall and extending opposite to the pressing plate, the top wall and the inner retaining wall are co-located The fixed part. A 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 includes: An inner retaining wall is arranged along the fixing member; at least one elastic piece protrudes from the inner retaining wall in the direction of the light guide plate and abuts against the non-light-incident surface of the light guide plate; at least one pressing plate is formed by the The inner barrier wall extends in the direction of the light guide plate, is perpendicular to the inner barrier wall, and can be pressed against the light emitting surface of the light guide plate; a top wall is connected to the top edge of the inner barrier wall and is opposite to the pressing plate Extension; and an external retaining wall connected to the top wall and extending in the same direction as the internal retaining wall, the internal retaining wall, the top wall, and the external retaining wall jointly surround an accommodation space, and the accommodation The space is sleeved on the fixing part. A backlight module includes: a back plate having a bottom plate and at least one side wall; a light guide plate placed on the bottom plate of the back plate; and the limitations as described in items 1 to 17 of the scope of patent application The positioning device is arranged between the side wall of the back plate and the light guide plate. A display device includes: a backlight module as described in item 18 of the scope of patent application; and a display panel arranged above the light guide plate.

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