Backlight module and display device

Abstract

A backlight module comprises a back plate, a reflective sheet disposed on the back plate and forming a plurality of openings, a plurality of light-emitting components located in the openings, at least one optical component disposed on the reflective sheet, and at least one support member located between the back plate and the reflective sheet. The support member can move with the reflective sheet. The support member has a base portion and a top support portion extending from the base portion toward the optical component, the base portion of the support member is located between the back plate and the reflective sheet, and the top support portion of the support member passes through the reflective sheet to support the optical component. Since the support member is not a fixed design and can move with the reflective sheet, other plates under the reflective sheet do not need to be punched, which can improve the convenience of assembly and effectively reduce the mechanism interference caused by the expansion and contraction of the reflective sheet. The present application also provides a display device including the backlight module.

Description

Technical Field

[0001] The present application relates to an optical device, and in particular to a backlight module and a display device. Background Art

[0002] Existing backlight modules can be divided into direct-lit backlight modules and edge-lit backlight modules. Since the light source of the direct-lit backlight module is evenly distributed behind the display panel, the direct-lit backlight module can obtain better picture uniformity. Generally speaking, a direct-lit backlight module will set a reflector on the circuit board to increase the brightness of the light source.

[0003] A support column is usually arranged between the bottom plate and the diffusion plate of the backlight module to support the diffusion plate upward. However, the existing support column is usually inserted into the bottom plate in a chimeric manner, which may cause assembly difficulties due to tolerance, increase assembly time and defect rate. Summary of the invention

[0004] Therefore, the purpose of this application is to provide a backlight module that solves the above problems.

[0005] A backlight module comprises a back plate, a reflective sheet disposed on the back plate and forming a plurality of openings, a plurality of light emitting elements in the openings, at least one optical component disposed on the reflective sheet, and at least one support member located between the back plate and the reflective sheet. The support member can move with the reflective sheet. The support member has a base portion and a top support portion extending from the base portion toward the optical component, the base portion of the support member is located between the back plate and the reflective sheet, and the top support portion of the support member passes through the reflective sheet to support the optical component.

[0006] Another technical means of the present application is that the expansion coefficient of the reflector is greater than the expansion coefficient of the support member.

[0007] Another technical means of the present application is that the base portion of the support member supports the reflective sheet.

[0008] Another technical means of the present application is that the backlight module further includes an adhesive member for fixing the reflective sheet, the adhesive member has a plurality of notches, the notches are non-adhesive, and the support member is located in the notches.

[0009] Another technical means of the present application is that the reflective sheet includes multiple reflective parts, each reflective part has a bottom wall and a surrounding wall connected to the bottom wall, and the base part of the support member has at least one inclined surface, the shape of the inclined surface matches the surrounding wall of the reflective part.

[0010] Another technical means of the present application is that the reflecting part of the reflecting sheet is arranged in a matrix, and the surrounding wall of the reflecting part has a plurality of first wall parts extending along a first direction and a plurality of second wall parts extending along a second direction, wherein the first direction is non-parallel to the second direction.

[0011] Another technical means of the present application is that the support member is disposed on one of the first wall portion and the second wall portion of the reflector, and the base portion of the support member extends in a straight line shape.

[0012] Another technical means of the present application is that the support member is disposed at the intersection of the first wall portion and the second wall portion of the reflector, and the base portion of the support member extends in a straight line.

[0013] Another technical means of the present application is that the support member is arranged at the intersection of the first wall portion and the second wall portion of the reflector, and the base portion of the support member extends in a cross shape, and the top support portion of the support member is arranged at the intersection of the base portion.

[0014] Another technical means of the present application is that a hole is formed at the top edge of one of the first wall portion and the second wall portion of the reflector, and the supporting portion of the support member passes through the hole of the reflector to support the optical component.

[0015] Another technical means of the present application is that a hole is formed on the top edge of the intersection of the first wall portion and the second wall portion of the reflector, and the supporting portion of the support member passes through the hole of the reflector to support the optical component.

[0016] Another object of the present application is to provide a display device, comprising the backlight module as described above, and a display panel disposed on the backlight module.

[0017] The utility of the present application is that the support member is not a fixed design but can move with the reflector, so other plates under the reflector do not need to be perforated, which can improve assembly convenience and effectively reduce mechanical interference caused by expansion and contraction of the reflector. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional exploded view, which is a preferred embodiment of the backlight module of the present application;

[0019] Figure 2 It is a cross-sectional view, showing Figure 1 The internal structure after assembly;

[0020] Figure 3 This is a partial enlarged picture, for auxiliary explanation Figure 2 ;

[0021] Figure 4 is a cross-sectional view of a preferred embodiment of the display device of the present application; and

[0022] Figure 5 It is a three-dimensional exploded view, illustrating another form of the support. DETAILED DESCRIPTION

[0023] The features and technical contents of the related patent applications of this application will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Before the detailed description, it should be noted that similar components are represented by the same numbers.

[0024] See also Figure 1 and Figure 2 , which is a preferred embodiment of the backlight module of the present application, comprises a back plate 2, a circuit board 3 disposed on the back plate 2, a plurality of light emitting components 4 disposed on the circuit board 3, a reflective sheet 5 disposed on the circuit board 3 and forming a plurality of openings 50, an adhesive component 6 for fixing the reflective sheet 5, a plurality of optical components 7 disposed on the reflective sheet 5, and at least one supporting component 8 located between the back plate 2 and the reflective sheet 5. The number of the supporting components 8 can be adjusted according to the specifications of the backlight module. In this embodiment, two supporting components 8 are used as an example for explanation, and the optical components 7 can be a plurality of stacked optical films.

[0025] like Figure 1 As shown, the reflective sheet 5 includes a plurality of reflective portions 51 arranged in a matrix, each reflective portion 51 having a bottom wall 511 and a surrounding wall 512 connected to the bottom wall 511, and the opening 50 of the reflective sheet 5 is located at the bottom wall 511 of the reflective portion 51. It should be noted that in this embodiment, the number of the circuit board 3 is one and is stacked on the back plate 2, and the light-emitting elements 4 are arranged in a matrix on the circuit board 3, respectively passing through the openings 50 on the bottom wall 511 of the reflective portion 51 and being located in the corresponding reflective portion 51, as shown in FIG. Figure 2 As shown. The adhesive member 6 attaches the reflective sheet 5 to the circuit board 3. The adhesive member 6 has a plurality of notches 61. The notches 61 are non-adhesive. The support member 8 is located in the notches 61. Due to the design of the notches 61, when the adhesive member 6 attaches the reflective sheet 5 to the circuit board 3, the support member 8 is not attached to the circuit board 3. Therefore, the support member 8 is not fixed to the circuit board 3. In other embodiments, the circuit board 3 may be a plurality of strip structures arranged at intervals. The adhesive member 6 has a plurality of attachment components arranged at intervals on the back plate 2. The reflective sheet 5 is attached to the back plate 2. The notches 61 may be non-adhesive areas between the attachment components, which can also accommodate the support member 8 without fixing the support member 8 to the back plate 2.

[0026] like Figure 1 and Figure 2 As shown, each of the support members 8 has a base portion 81 and a top support portion 82 extending from the base portion 81 toward the direction of the optical component 7. The base portion 81 of the support member 8 is located between the back plate 2 and the reflector 5, and the top support portion 82 of the support member 8 passes through the reflector 5 to support the optical component 7.

[0027] Compared to the conventional technology, which requires forming holes on both the back plate (or circuit board) and the reflector before assembling the support member, the support member 8 of this embodiment does not pass through the back plate 2 (or the circuit board 3), that is, it does not need to be assembled on the back plate 2 (or the circuit board 3) in advance, nor does it need to make assembly holes on the back plate 2 (or the circuit board 3), which can save relatively manufacturing costs. In particular, the circuit board 3 is a high-priced component, and the risk of making additional holes is too high. The circuit board 3 after the holes is also difficult to be widely used in other models, which does not help reduce inventory costs.

[0028] In contrast, in this embodiment, it is only necessary to pass the top support portion 82 of the support member 8 through the reflective sheet 5. When the reflective sheet 5 is attached to the circuit board 3, the assembly is completed, which can reduce the alignment procedure, working hours and defect rate, and improve the convenience of assembly.

[0029] In addition, the support member 8 of this embodiment is disposed on the reflective sheet 5 and can move with the reflective sheet 5. It is a non-fixed design and is not fixed on the circuit board 3 (or the back plate 2). Therefore, when the reflective sheet 5 is slightly offset due to thermal expansion and contraction, the support member 8 will move synchronously to avoid mechanical interference between the reflective sheet 5 and the support member 8. Furthermore, in other embodiments, the expansion coefficient of the reflective sheet 5 is greater than the expansion coefficient of the support member 8. Therefore, when the reflective sheet 5 is slightly offset due to thermal expansion and contraction, the support member 8 will produce a smaller synchronous movement due to the smaller expansion coefficient.

[0030] In addition, the reflector 5 and the optical component 7 are both supported by the support member 8. Specifically, the base portion 81 supports the reflector 5, and the support portion 82 supports the optical component 7, thereby effectively ensuring that the distance between the reflector 5 and the optical component 7 remains consistent, and the distance is not easily changed due to thermal expansion and contraction, thereby affecting the optical quality.

[0031] Further reading Figure 1The base portion 81 of the support member 8 has at least one inclined surface 811, and the shape of the inclined surface 811 matches the surrounding wall 512 of the reflecting portion 51. More specifically, in this embodiment, each base portion 81 has two triangular prisms 810 extending in a cross shape, and each triangular prism 810 has the inclined surface 811 formed on two opposite sides. The surrounding wall 512 of each reflecting portion 51 has a plurality of first wall portions 513 extending along a first direction, and a plurality of second wall portions 514 extending along a second direction, wherein the first direction is non-parallel to the second direction.

[0032] In this embodiment, the support member 8 is disposed at the intersection of the first wall portion 513 and the second wall portion 514 of the reflector 5, the inclined surface 811 of one triangular prism 810 of the base portion 81 matches with the first wall portion 513 of two adjacent reflective portions 51, and the inclined surface 811 of another triangular prism 810 of the base portion 81 matches with the second wall portion 514 of two adjacent reflective portions 51. Since the inclined surface 811 matches with the first wall portion 513 or the second wall portion 514, sufficient supporting force can be provided to the reflector 5, and the support member 8 can be limited to a fixed position on the bottom surface of the reflector 5.

[0033] In addition, if Figure 3 As shown, the top support portion 82 of the support member 8 is disposed at the intersection of the base portion 81. A hole 52 is formed at the top edge of the intersection of the first wall portion 513 and the second wall portion 514 of the reflector 5, and the top support portion 82 of the support member 8 passes through the hole 52 of the reflector 5 to support the optical component 7. Therefore, the support member 8 does not need to be assembled on the back plate 2 (or the circuit board 3) in advance, and since the cost of the reflector 5 is lower than that of the circuit board 3, the difficulty and processing cost of making the hole 52 on the reflector 5 can also be reduced. In this embodiment, the top support portion 82 is a column with a uniform diameter.

[0034] After the back plate 2, the circuit board 3, the adhesive member 6, the support member 8, the reflector 5, and the optical component 7 are assembled, the backlight module of the present application is formed. A display panel 9 is arranged on the light-emitting side of the backlight module, so as to form a backlight module as shown in FIG. Figure 4 The display device shown.

[0035] In some embodiments, the base portion 81 of the support member 8 may also extend in a straight line, such as Figure 5As shown. At this time, the support member 8 can also be arranged at the intersection of the first wall portion 513 and the second wall portion 514 of the reflector 5, and the supporting portion 82 of the support member 8 passes through the hole 52 of the reflector 5 to support the optical component 7. In some embodiments, the support member 8 can also be arranged at one of the first wall portion 513 and the second wall portion 514 of the reflector 5, and at this time, the hole 52 is formed at one of the first wall portion 513 and the second wall portion 514. In other words, the hole 52 is not limited to being formed at a straight position of the first wall portion 513 or the second wall portion 514, and can also be formed at the intersection of the first wall portion 513 and the second wall portion 514. Both positions are located at the top edge of the first wall portion 513 and / or the second wall portion 514 without damaging the inclined wall surface of the first wall portion 513 or the second wall portion 514, so as to avoid affecting the reflection effect of the light.

[0036] In summary, the backlight module and display device of the present application are not fixed in design, but can move with the reflector 5. Therefore, other plates below the reflector 5 do not need holes 52, which can improve the convenience of assembly and effectively reduce the mechanical interference caused by the expansion and contraction of the reflector 5. This design concept can be used in medium and large-sized direct-type backlight modules, such as car-mounted or television products.

[0037] However, what is described above is only a preferred embodiment of the present application and should not be used to limit the scope of implementation of the present application. That is, all simple equivalent changes and modifications made according to the claims and application description of the present application are still within the scope of the patent application.

[0038] Reference numerals list

[0039] 2 Back panel

[0040] 3 Circuit Board

[0041] 4 Luminous parts

[0042] 5 Reflective sheet

[0043] 50 Open

[0044] 51 Reflector

[0045] 511 bottom wall

[0046] 512 Surrounding Wall

[0047] 513 First wall

[0048] 514 Second wall

[0049] 52 Hole

[0050] 6 Adhesive parts

[0051] 61 Notch

[0052] 7 Optical components

[0053] 8 Support

[0054] 81 Base

[0055] 810 Triangular prism

[0056] 811 bevel

[0057] 82 Top support

[0058] 9 Display Panel

Claims

1. A backlight module, comprising: Back panel; A reflective sheet, located on the back plate, and the reflective sheet forms a plurality of openings; A plurality of light-emitting elements are located in the opening; At least one optical component is disposed on the reflective sheet; and At least one support member is located between the back plate and the reflective sheet, and the support member can move with the reflective sheet, wherein the support member has a base portion and a top support portion extending from the base portion toward the optical component, the base portion of the support member is located between the back plate and the reflective sheet, and the top support portion of the support member passes through the reflective sheet to support the optical component. The backlight module also includes an adhesive member for fixing the reflective sheet, the adhesive member has a plurality of notches, the notches are not sticky, and the support member is located in the notches and is not fixed to the back plate, and the expansion coefficient of the reflective sheet is greater than the expansion coefficient of the support member.

2. The backlight module according to claim 1, wherein: The base portion of the support member supports the reflective sheet.

3. The backlight module according to claim 1, wherein: The reflector sheet comprises a plurality of reflective parts, each of which has a bottom wall and a surrounding wall connected to the bottom wall. The base part of the support member has at least one inclined surface, the shape of which matches the surrounding wall of the reflective part.

4. The backlight module according to claim 3, wherein: The reflecting parts of the reflecting sheet are arranged in a matrix, and the surrounding walls of the reflecting parts have a plurality of first wall parts extending along a first direction and a plurality of second wall parts extending along a second direction, wherein the first direction is non-parallel to the second direction.

5. The backlight module according to claim 4, wherein: The support component is disposed on one of the first wall portion and the second wall portion of the reflector sheet, and the base portion of the support component extends in a straight line shape.

6. The backlight module according to claim 4, wherein: The support member is arranged at the intersection of the first wall portion and the second wall portion of the reflector, and the base portion of the support member extends in a straight line.

7. The backlight module according to claim 4, wherein: The support member is arranged at the intersection of the first wall portion and the second wall portion of the reflector, and the base portion of the support member extends in a cross shape, and the top support portion of the support member is arranged at the intersection of the base portion.

8. The backlight module according to claim 4, wherein: A hole is formed at the top edge of one of the first wall portion and the second wall portion of the reflector, and the supporting portion of the supporting member passes through the hole of the reflector to support the optical component.

9. The backlight module according to claim 4, wherein: A hole is formed at the top edge of the intersection of the first wall portion and the second wall portion of the reflector, and the supporting portion of the support member passes through the hole of the reflector to support the optical component.

10. The backlight module according to claim 1, wherein: A hole corresponding to the supporting part of the supporting member is formed on the reflecting sheet, and the supporting part is a column with a uniform diameter. The supporting part of the supporting member passes through the hole of the reflecting sheet to support the optical component.

11. A display device, comprising the backlight module according to any one of claims 1 to 10, and a display panel arranged on the backlight module.

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