Display device, backlight module and light source module positioning structure thereof

Abstract

The present application relates to display device, backlight module and its light source module positioning structure. The light source module positioning structure includes: backplate, the side wall of the backplate is equipped with guide part, the guide part is towards the accommodation space and extends obliquely downward, the front end of the guide part is equipped with positioning convex part; light source module, the side of the flexible circuit board of the light source module is provided with positioning notch, the positioning notch corresponds to the positioning convex part, and the positioning convex part is engaged in the positioning notch and carries out positioning assembly. Therefore, the light source module does not need to stick glue and can be positioned, thereby achieving the effect of shortening assembly or rework time.

Description

Technical Field

[0001] This invention relates to a display technology, and more particularly to a backlight module and its light source module positioning structure in a display. Background Technology

[0002] With the development of display technology, liquid crystal display (LCD) devices are widely used in the display field. Common LCD devices include LCD TVs, LCD computers, and automotive displays. An LCD device typically includes an LCD panel and a backlight module. The backlight module provides a light source to the LCD panel, and the LCD panel can modulate the light emitted from the backlight module to display images.

[0003] In related technologies, the backlight module 10 includes: a light guide plate 11, an optical film assembly 14, a reflective sheet 15, a light source module 12, and a frame 13. One side of the light guide plate 11 is a light-emitting surface, and the other side is a dotted surface. The optical film assembly 14 is disposed on the light-emitting surface of the light guide plate 11, and the reflective sheet 15 is disposed on the dotted surface side of the light guide plate 11. The frame 13 supports and covers the components of the backlight module 10. The light source module 12 includes a flexible circuit board 12a and a plurality of light sources 12b disposed on the flexible circuit board 12a. When the backlight module 110 is in use, the light emitted by the light source module 12 is guided by the light guide plate 11 and emitted from the light-emitting surface of the light guide plate 12, and finally emitted through the optical film assembly 14.

[0004] The current light source module 12 needs to be fixed in position using double-sided adhesive tape 16 during assembly. Specifically, a pressure fixture is used to attach and fix the flexible circuit board 12a, light guide plate 11, and reflector 15, and double-sided adhesive tape 16 is used to stick them to the frame 13, so that multiple light sources 12b are located between the light-incident side of the light guide plate 11 and the side wall 13a of the frame 13.

[0005] In summary, the current method of assembling the light source module 12 of the backlight module 10 by fixing it with adhesive has at least the following problems: This design requires the first application of double-sided adhesive tape 16 during assembly, and then the application and pressure operation is carried out by a pressure fixture. This assembly method makes the operation complicated, resulting in a long assembly time and making subsequent rework and maintenance difficult to complete.

[0006] Furthermore, when the light source module 12 is attached to the frame 13 via double-sided adhesive tape 16, and multiple light sources 12b are positioned between the light-incident side of the light guide plate 11 and the side wall 13a of the frame 13, a considerable gap G will appear between the light source 12b and the side wall 13a of the frame 13 due to the flexible circuit board 12a. The gap G of the current light source module 12 is approximately 0.4mm, which prevents the bezel of the display device from being further narrowed. Summary of the Invention

[0007] The purpose of this invention is to provide a positioning structure for the light source module of a backlight module, which eliminates the need for adhesive and simplifies assembly or rework processes and reduces working time through structural positioning and limiting.

[0008] To achieve the above objectives, the present invention provides a light source module positioning structure for a backlight module, comprising: a back plate, which includes a base plate and at least one side wall extending from the periphery of the base plate, the side wall being perpendicular to the base plate, forming an accommodating space between the side wall and the base plate, the side wall having at least one guide portion extending downward toward the accommodating space, and the front end of the guide portion having a positioning protrusion; and a light source module, which includes a flexible circuit board and a plurality of light sources arranged sequentially on the flexible circuit board, the positioning side of the flexible circuit board having at least one positioning notch corresponding to the positioning protrusion, and the positioning protrusion engaging with the positioning notch.

[0009] As a preferred embodiment, the positioning protrusion extends straight from the front end of the guide portion, or the positioning protrusion extends downward from the front end of the guide portion and perpendicular to the base plate.

[0010] As a preferred embodiment, the front end face of the guide portion abuts against the flexible circuit board.

[0011] In a preferred embodiment, the flexible circuit board has multiple protrusions formed on its side extending along the long axis near multiple light sources. These protrusions are arranged along the long axis. The positioning notch of the flexible circuit board is located on the positioning side extending along the short axis. The back plate includes a fixing wall, and this fixing wall has multiple openings adjacent to the flexible circuit board and extending along the long axis. The protrusions are correspondingly accommodated in these openings. Multiple recesses are formed between the protrusions, and the depth of the recesses is equal to the thickness of the fixing wall.

[0012] As a preferred embodiment, the protrusion corresponds to the position of each of the light sources on the flexible circuit board.

[0013] As a preferred embodiment, the fixed wall of the back plate extends to form a support portion, which is parallel to the base plate and is used to place the liquid crystal panel.

[0014] As a preferred embodiment, the guide portion has a vertical portion extending upward from the base plate and an inclined portion connected to the vertical portion, the inclined portion facing the receiving space, and an angle formed between the vertical portion and the inclined portion, the angle being an acute angle.

[0015] As a preferred embodiment, the guide portion has an outer side surface and an inner inclined surface, the inner inclined surface facing the receiving space, and the outer side surface and the inner inclined surface form an angle, the angle being an acute angle.

[0016] To achieve the above objectives, the present invention provides a backlight module, comprising: a light guide plate having a light incident surface and a light emitting surface connected to the light incident surface; and a positioning structure for the aforementioned light source module; the light guide plate is disposed on the base plate, and the light incident surface is adjacent to the light source module, and light emitted by multiple light sources enters the light guide plate through the light incident surface.

[0017] To achieve the above objectives, the present invention provides a display device comprising: the aforementioned backlight module, and a liquid crystal panel disposed on the light-emitting surface of the light guide plate.

[0018] Compared to prior art, the present invention has the following features: The positioning structure of the light source module of the present invention uses the positioning protrusion on the back plate and the positioning notch on the side edge of the flexible circuit board for positioning and limiting. During assembly, the flexible circuit board can be slid down to the positioning point for positioning and assembly, so that the positioning protrusion on the back plate engages with the positioning notch of the flexible circuit board. This assembly does not require adhesive positioning, thereby shortening the assembly or rework time, increasing the product yield, and reducing costs. Attached Figure Description

[0019] To gain a more complete understanding of the embodiments and their advantages, the following description is now made with reference to the accompanying drawings, in which:

[0020] Figure 1 This is a cross-sectional schematic diagram of a well-known backlight module.

[0021] Figure 2 This is an exploded view of the positioning structure of the light source module of the present invention.

[0022] Figure 3 This is a schematic diagram of the combined positioning structure of the light source module of the present invention.

[0023] Figure 4 for Figure 3 A-A cross section and enlarged partial schematic diagram.

[0024] Figure 5 for Figure 3 Another A-A section and a partially enlarged schematic diagram.

[0025] Figure 6 This is a partial schematic diagram of the guide portion in an embodiment of the present invention.

[0026] Figure 7 This is another partial schematic diagram of the guide portion in an embodiment of the present invention.

[0027] Figure 8 This is a partial schematic diagram of the display device in an embodiment of the present invention. Detailed Implementation

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

[0029] The following description of the embodiments is with reference to the accompanying drawings, illustrating specific embodiments in which the present invention can be implemented. Directional terms used in this invention, such as "up," "down," "front," and "back," are only relevant to the directions shown in the drawings. Therefore, the directional terms used are for illustration and understanding of this application and not for limiting it. Furthermore, in this specification, unless explicitly stated otherwise, the word "comprising" will be understood to mean including the stated elements but not excluding any other elements.

[0030] Please refer to Figure 2 , Figure 3 and Figure 8 The figures shown are schematic diagrams of the positioning structure of the light source module, a combined schematic diagram, and a partial schematic diagram of the display device, respectively, according to embodiments of the present invention. The present invention discloses a positioning structure for the light source module 200 of the backlight module 300, which includes: a back plate 100 and a light source module 200; the back plate 100 includes a base plate 110 and at least one sidewall 120 extending from the periphery of the base plate 110, the sidewall 120 being perpendicular to the base plate 110. In this embodiment, the sidewall 120 is disposed on both sides of the base plate 110, forming an accommodating space 130 between the sidewall 120 and the base plate 110; the sidewall 120 is provided with at least one guide portion 140. In this embodiment, each sidewall 120 on both sides of the base plate 110 is provided with a guide portion 140, the guide portion 140 extending downwards towards the accommodating space 130, and the front end of the guide portion 140 is provided with a positioning protrusion 150.

[0031] The light source module 200 includes a flexible circuit board 210 and a plurality of light sources 220 arranged sequentially on the flexible circuit board 210. The positioning side 230 of the flexible circuit board 210 is provided with at least one positioning notch 231, which corresponds to the aforementioned positioning protrusion 150, and the positioning protrusion 150 is fitted and secured to the positioning notch 231.

[0032] During assembly, thanks to the positioning notch 231 of the flexible circuit board 210 and the downwardly and inwardly inclined guide portion 140 and positioning protrusion 150 of the back plate 100, the flexible circuit board 210 can slide down the inclined surface of the guide portion 140 to the positioning point, causing the positioning protrusion 150 to engage with the positioning notch 231 of the flexible circuit board 210. This design allows the flexible circuit board 210 to be inserted into the receiving space 130 of the back plate 100 for positioning and limiting assembly. Therefore, the entire light source module 200 does not require adhesive positioning during assembly, thereby shortening assembly or rework time, increasing product yield, reducing costs, and improving the overall value of the backlight module 300.

[0033] In practical applications, the positioning protrusion 150 extends vertically from the front end of the guide portion 140 (e.g., Figure 4 (as shown), or formed by extending from the front end of the guide portion 140 and downwardly perpendicular to the base plate 110 (as shown). Figure 5 (As shown), to more tightly fit and secure with the positioning notch 231 of the flexible circuit board 210.

[0034] Please refer to the following: Figure 6 In practical applications, ideally, when the flexible circuit board 210 slides down the inclined surface of the guide portion 140 to the positioning point and the positioning protrusion 150 engages with the positioning notch 231 of the flexible circuit board 210, the front end face 141 of the guide portion 140 just abuts against the upper surface of the flexible circuit board 210. Thus, the flexible circuit board 210 is not only positioned and limited in the horizontal displacement of the base plate 110, but also the flexible circuit board 210 will not have vertical displacement on the base plate 110.

[0035] In practical applications, the guide portion 140 may include a vertical portion 142 extending upward from the base plate 110 and an inclined portion 143 connecting the vertical portion 142. An angle 144 is formed between the vertical portion 142 and the inclined portion 143, and the angle 144 is acute, causing the inclined portion 143 to face the receiving space 130. The entire guide portion 140 is integrally formed with the back plate 100, and the front end of the inclined portion 143 extends to provide the aforementioned positioning protrusion 150 (e.g., Figure 6 (As shown).

[0036] Please refer to the following: Figure 7In another implementation, the guide portion 140a can be a component assembled on the side wall 120 of the back plate 100. The guide portion 140a has an outer surface 142a and an inner inclined surface 143a, forming an angle 144a between the outer surface 142a and the inner inclined surface 143a. The angle 144a is an acute angle. The inner inclined surface 143a faces the receiving space 130, and the aforementioned positioning protrusion 150a extends from the front end face 141a of the inner inclined surface 143a. By additionally assembling the guide portion 140a to the back plate 100, the guide portion 140a can be applied to different models of the back plate 100 without changing the model and process of the back plate 100.

[0037] In practical applications, the flexible circuit board 210 of the light source module 200 has a plurality of protrusions 241 formed on its side 240, which is close to the light source 220 and extends along the long axis direction D1. These protrusions 241 are arranged along the long axis direction D1, and the protrusions 241 correspond to the positions of each light source 220 on the flexible circuit board 210. A positioning notch 231 of the flexible circuit board 210 is provided on the positioning side 230, which extends along the short axis direction D2. The back plate 100 includes a fixing wall 160, and the fixing wall 160 is adjacent to the flexible circuit board 210 and has a plurality of openings 161 formed along the long axis direction D1.

[0038] The protrusions 241 of the flexible circuit board 210 can be correspondingly accommodated in the opening 161 of the fixing wall 160, and a plurality of recesses 242 are formed between these protrusions 241, and the depth of these recesses 242 is preferably the thickness of the fixing wall 160. During the assembly process, when the flexible circuit board 210 slides down the inclined surface of the guide portion 140 to the positioning point, in addition to the positioning protrusion 150 engaging with the positioning notch 231 of the flexible circuit board 210, the protrusions 241 of the flexible circuit board 210 also need to be correspondingly fitted into the opening 161 of the fixing wall 160 to increase the positioning and limiting of the flexible circuit board 210.

[0039] In practical applications, the backlight module 300 includes at least a light guide plate 310, an optical film assembly 320, and the aforementioned positioned light source module 200. The light guide plate 310 has a light-incident surface 311 and a light-exiting surface 312 connected to the light-incident surface 311. The light guide plate 310 is disposed on the base plate 110, and the light-incident surface 311 is adjacent to the light source module 200. Light emitted from these light sources 220 enters the light guide plate 310 through the light-incident surface 311 and is then emitted from the light-exiting surface 312 (e.g., light from the light source module 220). Figure 8 (As shown).

[0040] In practical applications, the fixing wall 160 of the back plate 100 extends to form a support portion 170, which is parallel to the base plate 110 and can be used to place the liquid crystal panel 400. The liquid crystal panel 400 is disposed above the light-emitting surface 312 of the light guide plate 310 and the optical film assembly 320, thereby forming a display device 500 (e.g., Figure 8 As shown, the liquid crystal panel 400 is protected by the support portion 170, which can prevent friction between the liquid crystal panel 400 and the optical film group 320.

[0041] In practical applications, the backlight module 300 includes a reflective sheet 330, which is disposed below the light guide plate 310 to increase the probability that the light emitted by these light sources 220 is reflected to the light-emitting surface 312, thereby ensuring the optical effect of the light guide plate 200.

[0042] By designing the protrusions 241 of the flexible circuit board 210 to fit into the back plate 100, the light sources 210 can be positioned between the light-incident surface 311 of the light guide plate 310 and the fixing wall 160 of the back plate 100. Due to the design of the protrusions 241 and concave portions 242 of the flexible circuit board 210, and the structure where the protrusions 241 of the flexible circuit board 210 fit into the opening 161 of the fixing wall 160, the gap g between the light sources 220 on the flexible circuit board 210 and the fixing wall 160 can be reduced. According to the present invention, when the thickness of the fixing wall 160 is 0.3 mm, the gap G of the aforementioned known technology can be reduced. For example, the gap g of the structure of the present invention can be reduced to approximately 0.1 mm, thus further narrowing the bezel of the display device 500. Taking an automotive display device as an example, when the structural design of the present invention is applied to an automotive display device, its bezel design can be further narrowed. In addition, since the gap g between these light sources 220 and the fixed wall 160 is reduced, these light sources 220 can also be designed to be closer to the fixed wall 160, thereby increasing the corresponding range of the light guide plate 310 outside the effective operating area (AA area) of the liquid crystal panel 400, increasing the light mixing area of ​​these light sources 220, and optimizing the light emission quality.

[0043] The light source module positioning structure designed in this invention utilizes the positioning protrusion 150 of the guide portion 140 on the back plate 100 and the positioning notch 231 on the flexible circuit board 210 for positioning and limiting. During assembly, the flexible circuit board 210 can be slid downwards to the positioning point for fitting and positioning. This assembly process eliminates the need for adhesive positioning, thereby reducing adhesive costs, shortening assembly or rework time, increasing product yield, and reducing costs. Furthermore, the avoidance design between the back plate 100 and the flexible circuit board 210 reduces the gap between the light source 220 and the fixing wall 160 of the back plate 100, further narrowing the bezel of the display device 500. In addition, it increases the corresponding range of the light guide plate 310 outside the effective operating area (AA area) of the liquid crystal panel 400, increasing the light mixing area of ​​the light source 220 to optimize the light emission quality.

[0044] The embodiments disclosed above are merely illustrative of the principles, features, and effects of the present invention and are not intended to limit the scope of implementation of the present invention. Any person skilled in the art can modify and alter the above embodiments without departing from the spirit and scope of the present invention. Any equivalent changes and modifications made using the content disclosed in this invention shall still fall within the scope of the claims of this application.

[0045] [List of Labels in the Attached Image]

[0046] (Public intellectual)

[0047] 10: Backlight Module

[0048] 11: Light guide plate

[0049] 12: Light source module

[0050] 12a: Flexible Circuit Board

[0051] 12b: Light source

[0052] 13: Framework

[0053] 14: Optical film assembly

[0054] 15: Reflective sheet

[0055] 16: Double-sided adhesive tape

[0056] G: Gap

[0057] (This invention)

[0058] 100: Back panel

[0059] 110: Base Plate

[0060] 120: Side wall

[0061] 130: Storage space

[0062] 140, 140a: Guiding section

[0063] 141, 140a: End face

[0064] 142: Vertical section

[0065] 143: Inclined section

[0066] 144: Angle

[0067] 142a: Outer surface

[0068] 143a: Internal inclined surface

[0069] 144a: Angle

[0070] 150, 150a: Positioning convex portion

[0071] 160: Fixed wall

[0072] 161: Opening

[0073] 170: Bearing section

[0074] 200: Light source module

[0075] 210: Flexible Circuit Board

[0076] 220: Light source

[0077] 230: Positioning side

[0078] 231: Positioning Gap

[0079] 240: Side

[0080] 241: convex part

[0081] 242: concave part

[0082] 300: Backlight Module

[0083] 310: Light guide plate

[0084] 311: Surface receiving light

[0085] 312: Light-emitting surface

[0086] 320: Optical film assembly

[0087] 330: Reflector

[0088] 400: LCD panel

[0089] D1: Major axis direction

[0090] D2: Minor axis direction

[0091] g: gap.

Claims

1. A positioning structure for a light source module of a backlight module, characterized in that, Include: A backplate includes a base plate and at least one sidewall extending from the periphery of the base plate, the sidewall being perpendicular to the base plate and forming an accommodating space between the sidewall and the base plate. The sidewall is provided with at least one guide portion extending downwards toward the accommodating space, and the guide portion has a positioning protrusion at its front end. A light source module includes a flexible circuit board disposed on the base plate and a plurality of light sources arranged sequentially on the flexible circuit board. The positioning side of the flexible circuit board is provided with at least one positioning notch, which corresponds to the positioning protrusion, such that when the flexible circuit board slides down along the guide and the positioning protrusion engages with the positioning notch, the front end face of the guide abuts against the flexible circuit board.

2. The light source module positioning structure of the backlight module according to claim 1, characterized in that, The positioning protrusion is formed by extending straight from the front end of the guide portion.

3. The light source module positioning structure of the backlight module according to claim 1, characterized in that, The positioning protrusion is formed by the front end of the guide extending downward perpendicularly to the base plate.

4. The light source module positioning structure of the backlight module according to claim 1, characterized in that, The flexible circuit board has a plurality of protrusions formed on its side that is close to the plurality of light sources and extends along the long axis direction. The plurality of protrusions are arranged along the long axis direction. The positioning notch of the flexible circuit board is provided on the positioning side that extends along the short axis direction. The back plate includes a fixing wall, and the fixing wall is adjacent to the flexible circuit board and has a plurality of openings formed along the long axis direction. The protrusions are correspondingly accommodated in the openings.

5. The light source module positioning structure of the backlight module according to claim 4, characterized in that, Multiple recesses are formed between the multiple protrusions, and the depth of the multiple recesses is the thickness of the fixed wall.

6. The light source module positioning structure of the backlight module according to claim 4, characterized in that, The protrusion corresponds to the position of each of the light sources on the flexible circuit board.

7. The light source module positioning structure of the backlight module according to claim 4, characterized in that, The fixed wall of the back plate extends to form a support portion, which is parallel to the base plate and is used to place the liquid crystal panel.

8. The light source module positioning structure of the backlight module according to any one of claims 1 to 7, characterized in that, The guide portion has a vertical portion extending upward from the base plate and an inclined portion connected to the vertical portion. The inclined portion faces the accommodating space, and an angle is formed between the vertical portion and the inclined portion, and the angle is an acute angle.

9. The light source module positioning structure of the backlight module according to any one of claims 1 to 7, characterized in that, The guide portion has an outer side surface and an inner inclined surface, the inner inclined surface facing the accommodating space, and the outer side surface and the inner inclined surface form an angle, the angle being an acute angle.

10. A backlight module, characterized in that, Include: A light guide plate having an incident light surface and an emitting light surface connected to the incident light surface; and According to any one of claims 1 to 9, the light guide plate is disposed on the base plate, and the light incident surface is adjacent to the light source module, and the light emitted by the plurality of light sources enters the light guide plate through the light incident surface.

11. A display device, characterized in that, Include: The backlight module according to claim 10; and A liquid crystal panel is disposed on the light-emitting surface of the light guide plate.

Images