Backlight module capable of limiting reflector plate and display device

Abstract

The utility model relates to a backlight module capable of limiting a reflector plate and a display device. A backlight module capable of limiting a reflector plate comprises a back cover provided with an accommodating space; the circuit substrate is arranged in the accommodating space; the reflector plate is provided with a body and at least two folding wall parts, each folding wall part is bent from one end part of the body to enable the cross section of the reflector plate to be L-shaped, the body is arranged in the accommodating space, and each folding wall part is arranged on one side of the circuit substrate; the light guide plate is arranged in the containing space and located on one side of the reflector plate, the light guide plate protrudes to form at least two standing feet, and the folding wall parts of the reflector plate are clamped between the standing feet of the light guide plate and the circuit substrate; and a plurality of light-emitting elements disposed on the circuit board.

Description

Technical Field

[0001] The present utility model relates to a backlight module and a display device, and particularly to a backlight module and a display device with a position-limiting reflective sheet applied to vehicles. Background Art

[0002] Currently, due to the requirements of vehicle-mounted temperature change and vibration tests for backlight modules and display devices, components will rub and pat against each other during the test, resulting in the wear of the light guide plate dots and the generation of white clusters on the light-emitting surface, as well as the short-circuit phenomenon caused by the wear of the circuit board. One current method is to attach a light guide plate fixing adhesive between the light guide plate and the reflective sheet to prevent the two components from rubbing against each other during the test. Another method is to attach an anti-scratch tape to the circuit board to prevent the light guide plate feet from directly rubbing.

[0003] However, due to the light guide plate fixing adhesive, during the process of placing the light guide plate, it is easy to cause the reflective sheet to shift, resulting in the reflective sheet not being completely located below the LED, which affects the optical performance of the backlight module, and increasing the attachment of the fixing adhesive will also increase the cost. Using the anti-scratch tape will increase the cost, and the tape may also shift during the test, resulting in a decrease in the anti-scratch effect.

[0004] In view of this, it is necessary to provide a backlight module and a display device with a position-limiting reflective sheet to replace the light guide plate fixing adhesive between the light guide plate and the reflective sheet or the anti-scratch tape on the circuit board. Summary of the Utility Model

[0005] To achieve the above object, the present utility model provides a backlight module with a position-limiting reflective sheet, including: a back cover having an accommodation space; a circuit board disposed in the accommodation space; a reflective sheet having a body and at least two folding walls, each folding wall being bent from one end of the body to make the cross-section of the reflective sheet L-shaped, wherein the body is disposed in the accommodation space, and each folding wall is disposed on one side of the circuit board; a light guide plate disposed in the accommodation space and on one side of the reflective sheet, the light guide plate protruding to form at least two feet, and each folding wall of the reflective sheet being clamped between each foot of the light guide plate and the circuit board; and a plurality of light-emitting elements disposed on the circuit board.

[0006] The present utility model further provides a display device, including: the aforementioned backlight module; and a display panel disposed in front of the backlight module.

[0007] In some embodiments, the back cover has a substrate, a first side plate, and a second side plate, which together form the accommodation space, the first side plate and the second side plate are respectively located on opposite sides of the substrate, the body of the reflective sheet is located on the substrate, and the circuit board is located on the first side plate.

[0008] In some embodiments, at least one pushing member is further included, which is located between the light guide plate and the second side plate of the back cover, and the pushing member can generate a thrust on the light guide plate from the second side plate towards the first side plate.

[0009] In some embodiments, the pushing member is made of rubber.

[0010] In some embodiments, at least a part of the main body of the reflective sheet is located below the light-emitting elements.

[0011] In some embodiments, each of the feet of the light guide plate has a foot height, and each of the light-emitting elements has a light-emitting element height. The foot height is greater than the light-emitting element height, so that there is a gap between the light guide plate and the light-emitting elements.

[0012] In some embodiments, each of the feet of the light guide plate has a boss, and one surface of the boss abuts against one surface of each of the folding wall portions facing the foot, and the other surface of each of the folding wall portions facing away from the foot abuts against one surface of the circuit board.

[0013] In some embodiments, each of the feet of the light guide plate further has a positioning post, and the positioning post is disposed on the boss and passes through a positioning hole of each of the folding wall portions.

[0014] The backlight module and display device of the present utility model that can limit the reflective sheet utilize the design of folding wall portions at the feet of the light guide plate, so that the feet of the light guide plate clamp the reflective sheet between the light guide plate and the circuit board, and without attaching the light guide plate fixing glue, the mutual friction between the light guide plate and the reflective sheet due to vibration can be reduced, so as to achieve the purpose of avoiding displacement, better positioning requirements and optical taste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a partial top view schematic diagram of the backlight module of the present utility model.

[0016] Figure 2 It is a partial side view three-dimensional schematic diagram of an embodiment of the backlight module of the present utility model.

[0017] Figure 3 It is a partial enlarged side view three-dimensional schematic diagram of an embodiment of the backlight module of the present utility model.

[0018] Figure 4 It is a partial enlarged side view three-dimensional schematic diagram of another embodiment of the backlight module of the present utility model.

[0019] Figure 5 It is a three-dimensional schematic diagram of an embodiment of the light guide plate and the reflective sheet of the present utility model.

[0020] Figure 6It is a three-dimensional schematic diagram of another embodiment of the light guide plate and the reflector of the present utility model.

[0021] Figure 7 It is a side three-dimensional schematic diagram of the display device of the present utility model. Detailed implementation manners

[0022] The embodiments of the present utility model will be described in detail with reference to the drawings. The drawings are mainly simplified schematic diagrams, only schematically showing the basic structure of the present utility model. Therefore, only the elements related to the present utility model are marked in these drawings, and the elements shown are not drawn according to the number, shape, size ratio, etc. during implementation. The actual implementation specifications and dimensions are actually a selective design, and the layout form of its elements may be more complex.

[0023] The following descriptions of the embodiments refer to the attached drawings to illustrate specific embodiments in which the present utility model can be implemented. The directional terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for explaining and understanding the present application, rather than for limiting the present application. Additionally, in the specification, unless explicitly described to the contrary, the word "comprising" will be understood to mean including the said elements, but not excluding any other elements.

[0024] Please refer to Figures 1 to 3 and Figure 5 As shown, it is a preferred embodiment of the backlight module of the present utility model that can limit the reflector. The backlight module includes a back cover 10, a circuit board 20, a reflector 30, a light guide plate 40, and a plurality of light-emitting elements 50.

[0025] The back cover 10 has a receiving space 101, and the circuit board 20, the reflector 30, and the light guide plate 40 are all disposed in the receiving space 101.

[0026] The reflector 30 has a body 31 and at least two folding walls 32. Each folding wall 32 is bent from one end of the body 31 so that the cross-section of the reflector 30 is L-shaped. The body 31 is disposed in the receiving space 101, and each folding wall 32 is disposed on one side of the circuit board 20.

[0027] The light guide plate 40 is disposed in the receiving space 101 and on one side of the reflector 30. The light guide plate 40 protrudes to form at least two feet 41. Each folding wall 32 of the reflector 30 is clamped between each foot 41 of the light guide plate 40 and the circuit board 30. Therefore, the whole reflector 30 can be stably positioned and not displaced due to vibration because the folding walls 32 are clamped.

[0028] Thus, by using the design of the reflective sheet 30 with the folded wall portion 32, not only can a special local folded wall shape be achieved, but the folded wall portion 32 can also be used as a positioning structure for the reflective sheet 30 to avoid the concern of optical loss in the backlight module caused by the displacement of the reflective sheet 30, so as to achieve the purpose of maintaining better optical quality. At the same time, it also replaces the method of using tape to fix the light guide plate in the prior art to reduce the cost of using fixing glue and the attachment time.

[0029] The back cover 10 of the backlight module has a substrate 11, a first side plate 12 and a second side plate 13, and the three together form the accommodating space 101. The first side plate 12 and the second side plate 13 are respectively located on opposite sides of the substrate 11. The circuit board 20 is located on a surface of the first side plate 12 and is disposed in the accommodating space 101. More specifically, the main body 31 of the reflective sheet 30 is located on the substrate 11, and each of the folded wall portions 32 is disposed on one side of the circuit board 20, and the other side of the circuit board 20 abuts against the first side plate 12 of the back cover 10.

[0030] The light-emitting elements 50 are adjacently disposed on the circuit board 20, and the light-emitting elements 50 and the light guide plate 40 are used to refract light sources in the backlight module. The light-emitting elements 50 can be located between the circuit board 20 and the light guide plate 40.

[0031] At least a part of the main body 31 of the reflective sheet 30 is located below the light-emitting elements 50, so that the light emitted by the light-emitting elements 50 in the direction of the reflective sheet 30 can still be reflected and enter the light guide plate 40, and will not directly escape and cause loss of light energy, resulting in a decrease in the area scan uniformity (ASU).

[0032] Each of the feet 41 of the light guide plate 40 has a foot height, and each of the light-emitting elements 50 has a light-emitting element height. The foot height is greater than the light-emitting element height, so that there is a gap 70 between the light guide plate 40 and the light-emitting elements 50, and thus the light guide plate 40 will not touch the light-emitting elements 50.

[0033] Each of the feet 41 of the light guide plate 40 has a boss 401, one surface of the boss 401 abuts against one surface of each of the folded wall portions 32 facing the feet 41, and the other surface of each of the folded wall portions 32 facing away from the feet 41 abuts against one surface of the circuit board 20. In this way, each of the feet 41 of the light guide plate 40 does not directly contact or abut against the surface of the circuit board 20. That is to say, by using each of the folded wall portions 32 of the reflective sheet 30, it is possible to effectively prevent direct friction between each of the feet 41 of the light guide plate 40 and the circuit board 20. The surface of the circuit board 20 can thus omit the anti-scratch tape in the prior art (used to prevent the feet 41 of the light guide plate 40 from directly rubbing against the surface of the circuit board 20), thereby reducing the material cost and the attachment labor cost of the anti-scratch tape.

[0034] Please refer to Figures 1 to 4 As shown, in another embodiment, the backlight module further has a pushing member 60. The pushing member 60 is made of rubber. The pushing member 60 is located between the light guide plate 40 and the second side plate 13 of the back cover 10. Therefore, when the light guide plate 40 is assembled into the accommodating space 101, with the pushing member 60 being made of rubber or a material that is easily compressible and deformable, a tight fit with mutually interfering volumes is formed between the pushing member 60 and the light guide plate 40. The pushing member 60 can be compressed to generate a pushing force or a resilience force that returns to its original shape outward, and by means of the resilience force of the pushing member 60, a pushing force is generated on the light guide plate 40 from the second side plate 13 towards the first side plate 12, so that the light guide plate 40 is pushed towards the light incident side of the backlight module, thereby enabling the feet 41 of the light guide plate 40 and the circuit board 20 to more tightly clamp the folded wall portions 32 of the reflective sheet 30. In this way, the reflective sheet 30 is more firmly clamped and positioned, reducing the displacement of the reflective sheet 30 due to vibration and reducing the friction with the light guide plate 40, so as to achieve the purpose of maintaining a better optical quality.

[0035] Please refer to Figure 6 As shown, in still another embodiment, each of the feet 41 of the light guide plate 40 further has a positioning post 402. The positioning post 402 is provided on the boss 401 and passes through a positioning hole 321 of each of the folded wall portions 32. By using the matching design of the positioning hole 321 and the positioning post 402, when assembling the reflective sheet 30, it is convenient to indicate and guide the assembly position. Moreover, each of the folded wall portions 32 is hung on the positioning post 402 of each of the feet 41 by its positioning hole 321, which can make the boss 401 and the folded wall portions 32 more tightly positioned with each other, further improving the positioning effect, preventing each of the folded wall portions 32 from detaching from each of the feet 41, not easily undergoing displacement, reducing the friction between the reflective sheet 30 and the light guide plate 40, and achieving the purpose of maintaining a better optical quality.

[0036] The circuit board 20 is also designed with a receiving hole 201 at each end, and the positioning posts 402 of each pin 41 are also clamped in the receiving hole 201, so that the light guide plate 40 does not directly contact or abut against the surface of the circuit board 20, but abuts against the first side plate 12 behind the circuit board 20, thereby omitting the anti-scratch tape on the surface of the circuit board 20 in the prior art, and reducing the material cost and attachment labor cost of the anti-scratch tape.

[0037] Please refer to Figure 7 As shown, the backlight module of the present invention capable of limiting the reflective sheet further includes a plurality of optical films 80 respectively disposed on the light guide plate 40.

[0038] Please refer to Figure 7 As shown, it is a preferred embodiment of the display device of the present invention, including: a backlight module as described above, and a display panel 90 disposed in front of the backlight module.

[0039] As described above, for the backlight module and the display device of the present invention capable of limiting the reflective sheet, one end of the body 31 of the reflective sheet 30 is bent to form a folded wall portion 32 on one side of the back cover 10, and at least one pushing member 60 is disposed on the other side of the back cover 10 to push the light guide plate 40. In addition, at least two pins 41 are formed by protruding one end of the light guide plate 40, and the pins 41 and the circuit board 20 are respectively located on two opposite surfaces of the folded wall portion 32. Therefore, the folded wall portion 32 is tightly clamped between the light guide plate 40 and the circuit board 20, which can meet the requirements of tight fixing and positioning and maintain a better optical taste. And bending the extended body 31 of the original reflective sheet 30 to form the folded wall portion 32 can effectively limit the position, without the need to use additional fixing glue or add extra parts for limiting. In addition to saving the manufacturing cost and attachment labor, it can avoid optical loss caused by the displacement of the reflective sheet 30, and can also achieve the effect of a special folded wall shape, and make the overall display effect of the display screen better. The backlight module and the display device of the present invention can be applied to various display products, especially vehicle-mounted displays, especially side-entry backlight module vehicle-mounted displays. In vehicle-mounted displays with frequent vibrations, strengthening the limit design of the reflective sheet 30 can avoid the white mass phenomenon of the light guide plate 40 caused by friction, maintain a better optical taste, and can also reduce the short-circuit phenomenon of the circuit board 20 caused by wear.

[0040] 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 that can be implemented. Those skilled in the art can modify and change the above embodiments without departing from the spirit and scope of the present invention. Any equivalent changes and modifications made by using the content disclosed in the present invention should still be covered by the claims.

[0041]

Description of Symbols

[0042] 10: Back cover

[0043] 101: Accommodating space

[0044] 11: Substrate

[0045] 12: First side plate

[0046] 13: Second side plate

[0047] 20: Circuit board

[0048] 201: Accommodating hole

[0049] 30: Reflective sheet

[0050] 31: Body

[0051] 32: Folded wall part

[0052] 321: Positioning hole

[0053] 40: Light guide plate

[0054] 41: Standing foot

[0055] 401: Boss

[0056] 402: Positioning post

[0057] 50: Light-emitting element

[0058] 60: Pushing member

[0059] 70: Gap

[0060] 80: Optical film

[0061] 90: Display panel.

Claims

1. A backlight module with a limitable reflector, characterized in that Comprising: A back cover having a receiving space; A circuit board disposed in the receiving space; A reflective sheet having a body and at least two folding wall portions. Each folding wall portion is bent from one end of the body so that the cross-section of the reflective sheet is L-shaped. The body is disposed in the receiving space, and each folding wall portion is disposed on one side of the circuit board; A light guide plate disposed in the receiving space and on one side of the reflective sheet. The light guide plate protrudes to form at least two feet. Each folding wall portion of the reflective sheet is clamped between each foot of the light guide plate and the circuit board; And A plurality of light-emitting elements disposed on the circuit board.

2. The backlight module with a position-limiting reflective sheet as described in claim 1, wherein The back cover has a substrate, a first side plate and a second side plate, and the three together form the receiving space. The first side plate and the second side plate are respectively located on opposite sides of the substrate. The body of the reflective sheet is located on the substrate, and the circuit board is located on the first side plate.

3. The backlight module with a limitable reflective sheet as claimed in claim 2, wherein, It further includes at least one pushing member located between the light guide plate and the second side plate of the back cover. The pushing member can generate a thrust on the light guide plate from the second side plate towards the first side plate.

4. The backlight module with a position-limiting reflective sheet according to claim 3, wherein The pushing member is made of rubber material.

5. The backlight module with a limitable reflective sheet as claimed in claim 1, wherein, At least a part of the body of the reflective sheet is located below the light-emitting elements.

6. The backlight module with a position-limitable reflective sheet as claimed in claim 1, wherein Each foot of the light guide plate has a foot height, and each of the light-emitting elements has a light-emitting element height. The foot height is greater than the light-emitting element height, so that there is a gap between the light guide plate and the light-emitting elements.

7. The backlight module with a position-limitable reflective sheet according to any one of claims 1 to 6, wherein Each foot of the light guide plate has a boss. One surface of the boss abuts against one surface of each folding wall portion facing the foot, and the other surface of each folding wall portion facing away from the foot abuts against one surface of the circuit board.

8. The backlight module with a position-limitable reflective sheet as described in claim 7, characterized in that Each foot of the light guide plate further has a positioning post. The positioning post is disposed on the boss and passes through the positioning holes of each folding wall portion.

9. A display device, characterized in that, Comprising: A backlight module with a limitable reflective sheet as described in any one of claims 1 to 8; and A display panel disposed in front of the backlight module.

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