Backlight module and display device

Abstract

A backlight module comprises: an optical unit (1); a frame structure (2), which comprises a back plate (21) for carrying the optical unit (1), and an outer frame (22) combined with the back plate (21), wherein the outer frame (22) comprises a side wall section (221) surrounding the optical unit (1), and the side wall section (221) is provided with at least one first limiting portion (222) extending toward one side of the optical unit (1); and a reflective sheet (3), which comprises a second limiting portion (L), and the second limiting portion (L) is not covered by the optical unit (1), wherein the first limiting portion (222) of the outer frame (22) limits the second limiting portion (L) of the reflective sheet (3). A display device comprising the backlight module is also provided.

Description

Technical Field

[0001] The invention relates to a backlight module, and in particular to a backlight module in which a mechanism for limiting a reflective sheet is integrated into a frame structure, and a display device using the backlight module. Background Art

[0002] Liquid crystal display devices, as display components of electronic devices, are currently widely used in various electronic products. The backlight module of the liquid crystal display device has a reflector, which is used to reflect light. The conventional assembly method of the backlight module is to stick the reflector to the back plate with double-sided tape, or to limit the reflector by other components other than the frame structure such as a rubber frame and a back cover.

[0003] However, the conventional assembly method requires the opening of a mold for the mechanism components in order to produce the mechanism components; then, the reflector sheet needs to be fixed by assembling the mechanism components with double-sided adhesive tape. Thus, the conventional assembly method requires the opening of a mold for the mechanism components, which will generate additional production cost issues. In addition, the conventional assembly method not only takes a long time to assemble, but also after the challenge test, the reflector sheet and the back plate are prone to warping and not fitting well due to the weakened viscosity of the double-sided adhesive tape, resulting in poor optical quality.

[0004] In view of this, it is necessary to provide a backlight module to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a backlight module having a frame structure integrated with a mechanism for limiting a reflective sheet.

[0006] Another object of the present invention is to provide a display device, which may have the above-mentioned backlight module.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a backlight module, comprising: an optical unit; a frame structure, which has a back plate for supporting the optical unit, and an outer frame combined with the back plate, the outer frame has a side wall section surrounding the optical unit, the side wall section is provided with at least one first limiting portion extending toward one side of the optical unit; and a reflective sheet, which has a second limiting portion, and the second limiting portion is not covered by the optical unit, wherein the first limiting portion of the outer frame limits the second limiting portion of the reflective sheet.

[0008] The present invention also provides a display device, comprising: the aforementioned backlight module; and a display panel, which is located on the light-emitting side of the backlight module, wherein the outer frame of the frame structure also includes a supporting section, which extends from the side wall section toward the optical unit, and the display panel is arranged on the supporting section.

[0009] In some embodiments, the back panel includes a main body portion for supporting the optical unit, and at least one extension portion located at one end of the main body portion and extending toward one side of the optical unit, the extension portion and the side wall segment overlap each other, the extension portion has at least one first perforation, and the first limiting portion passes through the corresponding first perforation to press the second limiting portion of the reflective sheet to jointly press the reflective sheet with the main body portion of the back panel.

[0010] In some embodiments, the back panel includes a main body portion for supporting the optical unit, and an extension portion located at one end of the main body portion and extending toward one side of the optical unit, the extension portion has at least one first through-hole, the reflective sheet includes a base portion and a side portion extending from the base along the inner side of the extension portion, the second limiting portion is at least one second through-hole, the side portion, the extension portion and the side wall segment are overlapped with each other, and the first limiting portion passes through the corresponding first through-hole and the second through-hole in sequence.

[0011] In some embodiments, a hook portion is formed at the end of the first limiting portion.

[0012] In some embodiments, the second through hole is disposed between the base and the side.

[0013] In some embodiments, the second through hole is provided on the side portion.

[0014] In some embodiments, a gap is provided between the side portion of the reflective sheet and the extension portion, and the gap is used as an adjustment margin between the side portion of the reflective sheet and the extension portion.

[0015] In some embodiments, the length of the first limiting portion is greater than the sum of the thickness of the side portion of the reflective sheet, the thickness of the extending portion, and the gap.

[0016] In some embodiments, the optical unit further includes a light emitting mechanism and at least one optical film. The reflective sheet abuts against the light emitting mechanism, and the light emitting mechanism is located between the back plate and the at least one optical film.

[0017] In some embodiments, the optical unit further includes a light guide plate, which is located between the reflective sheet and at least one optical film, and the light emitting mechanism is arranged on the light incident side of the light guide plate, and the first limiting portion is arranged on a side of the frame structure not corresponding to the light emitting mechanism.

[0018] In some embodiments, the length of the bearing section is greater than the length of the first limiting portion.

[0019] The backlight module and display device of the present invention have the following characteristics: a first limiting portion can be partially extended from the outer frame, and the first limiting portion can press the second limiting portion of the reflective sheet. In this way, the backlight module and display device of the present invention can reduce the number of tapes or other components used to bond and fix the reflective sheet, thereby reducing the man-hours of traditional production and assembly steps such as bonding or flattening the reflective sheet, and by utilizing the structural design of the first limiting portion extending from the outer frame and the back plate to jointly press the reflective sheet, the assembly procedure can be simplified, thereby achieving the effects of saving the cost of tape usage, increasing the production efficiency of the production line, saving the cost of the components combined with the outer frame and the back plate, and reducing the manpower, material resources and time costs required in the assembly process of the backlight module, and even in the future when rework is required, since the reflective sheet is only limited by the first limiting portion, there will be no problem of difficulty in rework or rework loss caused by the bonding of double-sided tape, so the backlight module and display device of the present invention also have the effect of high module combination stability and reworkability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] For a more complete understanding of the embodiments and their advantages, the following description is now made with reference to the accompanying drawings, in which:

[0021] Figure 1 A partial cross-sectional view of a backlight module according to a first embodiment of the present invention;

[0022] Figure 2 A partial cross-sectional view of a backlight module according to a second embodiment of the present invention;

[0023] Figure 3 A partial cross-sectional view of a backlight module according to a third embodiment of the present invention;

[0024] Figure 4 It is a partial cross-sectional enlarged view of a backlight module according to a fourth embodiment of the present invention;

[0025] Figure 5 A partial three-dimensional diagram of a backlight module according to a fourth embodiment of the present invention;

[0026] Figure 6 is a partial cross-sectional enlarged view of the display device of the present invention; and

[0027] Figure 7 The cross-sectional view of the backlight module using edge-type lighting of the present invention. DETAILED DESCRIPTION

[0028] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings, wherein the accompanying drawings are mainly simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner. Therefore, only elements related to the present invention are indicated in the accompanying drawings, and the elements shown are not drawn in terms of number, shape, size ratio, etc. during implementation. The specifications and dimensions during actual implementation are actually a selective design, and the element layout may be more complex.

[0029] The following description of each embodiment with reference to the accompanying drawings is used to illustrate specific embodiments in which the present invention can be implemented. Directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", etc., refer only to the directions of the accompanying drawings. Therefore, the directional terms used are used to illustrate and understand the present application, rather than to limit the present application. In addition, in the specification, unless explicitly described to the contrary, the word "comprising" will be understood to mean including the elements described, but not excluding any other elements.

[0030] Reference Figure 1 , which shows a first embodiment of the backlight module of the present invention, which includes: an optical unit 1, a frame structure 2 and a reflective sheet 3, the frame structure 2 is used to support the optical unit 1, the reflective sheet 3 is abutted against the frame structure 2, and the portion of the reflective sheet 3 not covered by the optical unit 1 can be restricted by the frame structure 2.

[0031] According to the lighting mode, the backlight module of the present invention can be divided into a direct-type backlight module and an edge-type backlight module. In this embodiment, the direct-type backlight module is taken as an example for description, and the optical unit 1 includes a light-emitting mechanism 11 and at least one optical film 12, and the light-emitting mechanism 11 is located behind the at least one optical film 12.

[0032] The frame structure 2 includes a back plate 21 and an outer frame 22, wherein the back plate 21 is used to support the optical unit 1, and the outer frame 22 is combined with the back plate 21. Preferably, the outer frame 22 is arranged at the edge of the back plate 21. In this embodiment, the back plate 21 is made of metal material, and the outer frame 22 is made of plastic material (PVC).

[0033] Specifically, the outer frame 22 includes a side wall segment 221, which surrounds the optical unit 1 and has at least one first limiting portion 222 extending toward one side of the optical unit 1. In one embodiment, the first limiting portion 222 is a rod extending along the first axial direction A1, but is not limited thereto.

[0034] The reflector 3 includes a second limiting portion L. In the present embodiment, the second limiting portion L of the reflector 3 is the portion of the reflector 3 that is not covered by the optical unit 1. The second limiting portion L of the reflector 3 can be suppressed by the first limiting portion 222 of the outer frame 22. In the present embodiment, the first limiting portion 222 suppresses the second limiting portion L along the direction of the second axial direction A2, and the second axial direction A2 is the direction in which the reflector 3 faces the back plate 21. In this way, the reflector 3 of the backlight module of the present invention can be suppressed by the first limiting portion 222, that is, it can be bonded and fixed to the back plate 21 without using tape (such as double-sided tape), thereby saving the cost of tape usage and reducing the working hours of traditional production and assembly steps such as pasting or flattening the reflector, so as to increase the production efficiency of the production line. At the same time, because there is no need to use tape, it is also convenient for rework, so as to reduce the working hours of rework and the loss rate of components and materials.

[0035] On the other hand, since the first position-limiting portion 222 partially extends from the outer frame 22, the cost of the materials for combining the outer frame 22 and the back plate 21 can be saved. Furthermore, the structural design that the first position-limiting portion 222 of the outer frame 22 and the back plate 21 jointly press the reflector 3 can simplify the assembly process, thereby reducing the manpower, material resources and time costs required in the manufacturing and assembly process of the backlight module.

[0036] Reference Figure 2 , which shows a second embodiment of the frame structure of the present invention. In this embodiment, the back plate 21 includes a main body 211 and at least one extension portion 212. The extension portion 212 is located at one end of the main body 211 and extends toward one side of the optical unit 1. The extension portion 212 of the back plate 21 and the side wall section 221 of the outer frame 22 overlap each other, thereby improving the combination stability of the back plate 21 and the outer frame 22. Among them, the extension portion 212 of the back plate 21 has at least one first through hole 213, and the first limiting portion 222 of the outer frame 22 passes through the corresponding first through hole 213 of the back plate 21 to press the second limiting portion L of the reflective sheet 3, so as to press the reflective sheet 3 together with the main body 211 of the back plate 21. Thereby, this embodiment can be applied to the implementation of the back plate with an extension portion. Moreover, because the hole diameter of the first through hole 213 can be designed to be larger than the thickness of the reflector 3, when the first limiting portion 222 passes through the corresponding first through hole 213 of the back plate 21, its height in the first through hole 213 can be adjusted to be suitable for reflectors 3 of various thicknesses.

[0037] Reference Figure 3, which shows a third embodiment of the frame structure of the present invention. Compared with the first embodiment, in this embodiment, the back plate 21 includes a main body 211 and at least one extension portion 212. The extension portion 212 is located at one end of the main body 211 and extends toward one side of the optical unit 1. The extension portion 212 of the back plate 21 and the side wall section 221 of the outer frame 22 overlap each other, and the extension portion 212 of the back plate 21 has at least one first through hole 213.

[0038] The reflector 3 includes a base 31 and a side portion 32. The side portion 32 extends from the base 31 along the inner side of the extension portion 212 of the back plate 21. Thus, the base 31 and the side portion 32 of the reflector 3 can reflect light uniformly. The side portion 32, the extension portion 212 and the side wall segment 221 overlap each other along the first axis A1.

[0039] In this embodiment, the second position-limiting portion L of the reflector 3 is at least one second through hole 321, wherein the second through hole 321 can preferably be disposed between the base 31 and the side 32, so that the first position-limiting portion 222 of the outer frame 22 sequentially passes through the corresponding first through hole 213 of the back plate 21 and the second through hole 321 of the reflector 3 to be pressed to the base 31 of the reflector 3, thereby effectively limiting the position of the reflector 3. Thus, this embodiment can be applied to the back plate with an extension portion and the reflector with a side portion.

[0040] It is worth mentioning that there may be a gap G between the side portion 32 and the extension portion 212, and the gap G is used as an adjustment margin between the side portion 32 of the reflector 3 and the extension portion 212 of the back plate 21, and the width of the adjustment margin is sufficient to accommodate the thermal expansion and contraction space of the reflector 3 along the first axial direction A1. Furthermore, the length of the first limiting portion 222 is greater than the sum of the thickness of the side portion 32, the thickness of the extension portion 212 and the gap G, so as to ensure that the end of the first limiting portion 222 is effectively pressed on the base 31 of the reflector 3. In this way, in this embodiment, the margin between the assembly of the reflector 3 and the back plate 21 can be retained, and it is ensured that after the challenge test, there is enough thermal expansion and contraction space between the reflector 3 and the back plate 21, so as to avoid the risk of waving of the reflector 3 and the reduction of optical quality.

[0041] Reference Figure 4 and Figure 5, which shows the fourth embodiment of the frame structure of the present invention. Compared with the third embodiment, in this embodiment, the end of the first limiting portion 222 can also form a hook portion 223, and the extension direction of the hook portion 223 is different from the direction of the first axial direction A1. In this embodiment, the second limiting portion L of the reflector 3 is at least one second through hole 321, wherein the second through hole 321 can be preferably arranged between the base 31 and the side portion 32. In this way, the first limiting portion 222 of the outer frame 22 sequentially passes through the corresponding first through hole 213 of the back plate 21 and the second through hole 321 of the reflector 3, not only can the side portion 32 of the reflector 3 be effectively limited between the hook portion 223 and the extension portion 212 of the back plate 21 by the hook portion 223, but also can be pressed to the base portion 31 of the reflector 3 at the same time, so as to effectively limit the position of the reflector 3. For example, the end of the first limiting portion 222 can extend in a direction different from the first axial direction A1 to form the hook portion 223, but it is not limited thereto. In this embodiment, the hook portion 223 extends along the second axial direction A2 relative to the front direction of the optical unit 1. Preferably, the end of the first stop portion 222 may also face the rear direction relative to the optical unit 1, or the sky side or ground side relative to the outer frame 22.

[0042] Please refer to Figure 6 As shown, in another embodiment, the second through hole 321 of the reflector 3 can also be provided on the side portion 32, and the hook portion 223 can also limit the side portion 32 of the reflector 3 between the hook portion 223 and the back plate 21, so that it is easier to insert the second through hole 321 of the reflector 3 into the hook portion 223 during the assembly process. In addition, since the reflector 3 is limited only by the hook portion 223 of the first limiting portion 222, if rework is required, there will be no difficulty in rework or loss caused by pasting, so this embodiment also has the effect of high module combination stability and high reworkability.

[0043] Please refer to Figure 7 As shown, it shows a preferred embodiment of the display device of the present invention, comprising: the aforementioned backlight module and the display panel 4, the display panel 4 is located on the light-emitting side of the backlight module. Among them, the outer frame 22 of the frame structure 2 may also include a bearing section 224, and the bearing section 224 extends from the side wall section 221 toward the direction of the optical unit 1. The display panel 4 is arranged on the bearing section 224. It is worth mentioning that the length of the bearing section 224 is greater than the length of the first limiting portion 222. Thereby, the outer frame 22 can be directly used as the appearance part of the display device, and can shield the first limiting portion 222 located below, thereby achieving the effect of greatly reducing the overall volume of the display device. In addition, it can also reduce the assembly time of the additional appearance parts, thereby achieving the effects of reducing the number of parts, reducing the assembly time of parts, and reducing costs.

[0044] Figure 7Taking the edge-entry backlight module as an example, the optical unit 1 may further include a light guide plate 13, the light guide plate 13 is located between the reflective sheet 3 and at least one optical film 12, the light-emitting mechanism 11 is arranged to align with the light-incident surface of the light guide plate 13, and the reflective sheet 3 abuts against the light guide plate 13 of the light-emitting mechanism 11. In one embodiment, the light-emitting mechanism 11 is a light bar arranged between the light guide plate 13 and the frame structure 2, and the aforementioned first position-limiting portion 222 is preferably arranged on the non-light-incident side of the edge-entry backlight module. Thus, this embodiment can be applied to the implementation of the edge-entry backlight module.

[0045] As mentioned above, the backlight module and the display device of the present invention can extend the first limiting portion from the part of the outer frame, and make the first limiting portion press the second limiting portion of the reflective sheet. In this way, the backlight module and the display device of the present invention can reduce the number of tapes or other components used to bond and fix the reflective sheet, thereby reducing the man-hours of traditional production and assembly steps such as bonding or flattening the reflective sheet, and by using the structural design of the first limiting portion extending from the part of the outer frame and the back plate to jointly press the reflective sheet, the assembly procedure can be simplified, thereby achieving the effects of saving the cost of the amount of tape, increasing the production efficiency of the production line, saving the cost of the combination of the outer frame and the back plate, and reducing the manpower, material and time costs required in the assembly process of the backlight module, and even in the future when there is a need for rework, since the reflective sheet is limited only by the first limiting portion, there will be no problem of difficulty in rework or rework loss caused by the bonding of double-sided tape, so the backlight module and the display device of the present invention also have the effect of high module combination stability and reworkability.

[0046] The above disclosed embodiments are only illustrative of the principles, features and effects of the present invention, and are not intended to limit the scope of the present invention. Any person skilled in the art may modify and change the above embodiments without violating the spirit and scope of the present invention. Any equivalent changes and modifications made using the contents disclosed in the present invention shall still fall within the scope of the appended claims.

[0047] [List of Reference Numerals]

[0048] 1: Optical unit

[0049] 11: Light-emitting mechanism

[0050] 12: Optical film

[0051] 13: Light guide plate

[0052] 2: Framework structure

[0053] 21: Back panel

[0054] 211: Ontology Department

[0055] 212: Extension

[0056] 213: First Punch

[0057] 22: Outer frame

[0058] 221: Side wall section

[0059] 222: First limiter

[0060] 223: hook part

[0061] 224: Bearing section

[0062] 3: Reflective sheet

[0063] 31: Base

[0064] 32: Side

[0065] 321: Second piercing

[0066] 4: Display Panel

[0067] G: Gap

[0068] L: Second limiter

[0069] A1: First axis

[0070] A2: Second axis.

Claims

1. A backlight module, comprising: Optical unit; A frame structure having a back plate for carrying the optical unit, and an outer frame combined with the back plate, the outer frame having a side wall section surrounding the optical unit, the side wall section having at least one first limiting portion extending toward one side of the optical unit; and A reflective sheet having a second limiting portion, wherein the second limiting portion is not covered by the optical unit, wherein: The first limiting portion of the outer frame limits the second limiting portion of the reflective sheet, Wherein, the back panel includes a main body portion for supporting the optical unit, and at least one extension portion located at one end of the main body portion and extending toward one side of the optical unit, the extension portion and the side wall section are overlapped with each other, and the extension portion has at least one first through-hole, and the first limiting portion passes through the corresponding first through-hole to press the second limiting portion of the reflective sheet so as to press the reflective sheet together with the main body portion of the back panel.

2. The backlight module according to claim 1, wherein: The reflective sheet includes a base and a side portion extending from the base along the inner side of the extension portion, the second limiting portion is at least one second through hole, the side portion, the extension portion and the side wall segment overlap each other, and the first limiting portion passes through the corresponding first through hole and the second through hole in sequence.

3. The backlight module according to claim 2, wherein: The end of the first limiting portion forms a hook portion.

4. The backlight module according to claim 2, wherein: The second through hole is disposed between the base portion and the side portion.

5. The backlight module according to claim 2, wherein: The second through hole is disposed on the side portion.

6. The backlight module according to claim 2, wherein: A gap is provided between the side portion of the reflection sheet and the extension portion, and the gap is used as an adjustment margin between the side portion of the reflection sheet and the extension portion.

7. The backlight module according to claim 6, wherein: The length of the first limiting portion is greater than the sum of the thickness of the side portion of the reflector, the thickness of the extending portion and the gap.

8. The backlight module according to claim 1, wherein: The optical unit further includes a light emitting mechanism and at least one optical film. The reflective sheet is in contact with the light emitting mechanism. The light emitting mechanism is located between the back plate and the at least one optical film.

9. The backlight module according to claim 1, wherein: The optical unit also includes a light guide plate, a light emitting mechanism and at least one optical film, the light guide plate is located between the reflective plate and the at least one optical film, and the light emitting mechanism is arranged on the side of the light guide plate, and the first limiting portion is arranged on a side of the frame structure that does not correspond to the light emitting mechanism.

10. A display device, comprising: The backlight module according to any one of claims 1 to 9; and The display panel is located at the light-emitting side of the backlight module, wherein: The outer frame of the frame structure further includes a bearing section, which extends from the side wall section toward the optical unit, and the display panel is disposed on the bearing section.

11. The display device according to claim 10, wherein: The length of the bearing section is greater than the length of the first limiting portion.

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