WO2023065302A1

WO2023065302A1 - Display apparatus, backlight module, and light source module positioning structure thereof

Info

Publication number: WO2023065302A1
Application number: PCT/CN2021/125696
Authority: WO
Inventors: 张政德; 林家叶; 李育儒; 侯佩棻
Original assignee: 瑞仪(广州)光电子器件有限公司
Priority date: 2021-10-22
Filing date: 2021-10-22
Publication date: 2023-04-27

Abstract

A display device (500), a backlight module (300), and a light source module (200) positioning structure thereof. The light source module (200) positioning structure comprises: a back plate (100), a side wall (120) of the back plate (100) being provided with a guide portion (140), the guide portion (140) facing an accommodation space (130) and extending inclined downward, and the front end of the guide portion (140) being provided with a positioning protruding part (150); a light source module (200), a positioning notch (231) being provided on a positioning side (230) of a flexible circuit board (210) of the light source module (200), the positioning notch (231) corresponding to the positioning protruding part (150), and the positioning protruding part (150) being clamped in the positioning notch (231) for positioning and assembling. Therefore, the light source module (200) can be positioned without gluing, thereby reducing the manhours for assembly or heavy work.

Description

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

technical field

The invention relates to a display technology, in particular to a backlight module and a light source module positioning structure in the display.

Background technique

With the development of display technology, liquid crystal display devices are widely used in the field of display. Common liquid crystal display devices include, for example, liquid crystal televisions, liquid crystal computers, and vehicle-mounted displays. A liquid crystal display device generally includes a liquid crystal display panel and a backlight module. The backlight module is used to provide a light source for the liquid crystal display panel. The liquid crystal display panel can modulate the light emitted by the backlight module to realize image display.

In the related art, the backlight module 10 includes: a light guide plate 11 , an optical film set 14 , a reflection sheet 15 , a light source module 12 and a frame 13 . One side of the light guide plate 11 is the light-emitting surface, and the other side is the dot surface, the optical film group 14 is arranged on the light-emitting surface of the light guide plate 11, the reflector 15 is arranged on the dot surface side of the light guide plate 11, and the frame 13 is carried and covered. Components of the above-mentioned backlight module 10 . The light source module 12 includes a flexible circuit board 12a and a plurality of light sources 12b arranged on the flexible circuit board 12a. When the backlight module 110 is in use, the light emitted by the light source module 12 passes through the light guide plate 11 and then passes through the light guide plate 11. 12 out of the light emitting surface, and finally through the optical film group 14 out.

The current light source module 12 needs to use double-sided adhesive tape 16 to fix the position when assembling. Stickers 16 are used to stick it on the frame 13 , so that the plurality of light sources 12 b are located between the light incident side of the light guide plate 11 and the side wall 13 a of the frame 13 .

To sum up, the current assembly of the light source module 12 of the backlight module 10 has at least the following problems in the positioning method of gluing and fixing. In this design, the double-sided adhesive 16 needs to be pasted first during assembly, and then pressurized. Attaching and pressing the tool, such assembly can make the operation complicated, resulting in a long assembly time and difficult to complete the subsequent heavy maintenance.

Moreover, when the light source module 12 is pasted on the frame 13 via the double-sided adhesive tape 16, so that the plurality of 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, because the flexible circuit board 12a, there will be a large gap G between the light source 12b and the side wall 13a of the frame 13, and the gap G of the current light source module 12 is about 0.4mm, which makes the frame of the display device unable to be further narrowed.

Contents of the invention

The purpose of the present invention is to provide a light source module positioning structure of a backlight module, which does not require glue application, and achieves the effect of simplifying assembly or rework process and shortening working hours through structural positioning and position limiting.

In order to achieve the above object, the present invention provides a light source module positioning structure of a backlight module, comprising: a back plate, which includes a bottom plate and at least one side wall extending from the periphery of the bottom plate, the side wall is perpendicular to the bottom plate, the An accommodating space is formed between the side wall and the bottom plate, the side wall is provided with at least one guide portion, the guide portion extends obliquely downward toward the accommodating space, and the front end of the guide portion is provided with a positioning protrusion; the light source module , which includes a flexible circuit board and a plurality of light sources sequentially arranged on the flexible circuit board, at least one positioning notch is provided on the positioning side of the flexible circuit board, and the positioning notch corresponds to the positioning protrusion, and The positioning protrusion is engaged with the positioning notch.

As a preferred manner, the positioning protrusion extends straightly from the front end of the guide part, or the positioning protrusion extends downward from the front end of the guide part perpendicular to the bottom plate.

As a preferred manner, the front end surface of the guide portion abuts against the flexible circuit board.

As a preferred manner, the flexible circuit board is formed with a plurality of protrusions on the side extending along the long axis direction near the plurality of light sources, and the plurality of protrusions are arranged along the long axis direction, and the flexible circuit board The positioning notch is arranged on the positioning side extending along the short axis direction, the back plate includes a fixed wall, and the fixed wall is adjacent to the flexible circuit board and has a plurality of openings formed along the long axis direction, the protrusion Correspondingly accommodated in the opening. A plurality of recesses are formed between the plurality of protrusions, and the depth of the plurality of recesses is equal to the thickness of the fixed wall.

As a preferred manner, the protrusion corresponds to the position of each light source on the flexible circuit board.

As a preferred manner, the fixing wall of the back panel is extended to form a bearing portion, and the bearing portion is parallel to the bottom plate and for the liquid crystal panel to be placed.

As a preferred manner, the guide part has a vertical part extending upward from the bottom plate and an inclined part connected to the vertical part, the inclined part faces the accommodating space, an angle is formed between the vertical part and the inclined part, and the The included angle is an acute angle.

As a preferred manner, the guide portion has an outer surface and an inner inclined surface, the inner inclined surface faces the accommodating space, an included angle is formed between the outer surface and the inner inclined surface, and the included angle is an acute angle.

In order to achieve the above object, the present invention provides a backlight module, comprising: a light guide plate, which has a light incident surface and a light exit surface connected to the light incident surface; and the positioning structure of the aforementioned light source module; the light guide plate is arranged on the On the bottom plate, and the light incident surface is adjacent to the light source module, the light emitted by a plurality of light sources enters the light guide plate through the light incident surface.

To achieve the above object, the present invention provides a display device, which includes: the aforementioned backlight module, and a liquid crystal panel disposed on the light emitting surface of the light guide plate.

Compared with the prior art, the present invention has the following characteristics: The positioning structure of the light source module of the present invention uses the positioning protrusions on the back plate and the positioning notches on the side edges of the flexible circuit board to perform positioning and positioning During assembly, the flexible circuit board can be slid down to the positioning point for positioning and assembly, so that the positioning convex part of the backplane is engaged with the positioning notch of the flexible circuit board. This assembly does not need glue for positioning, so it can Shorten assembly or rework man-hours, increase product yield, and reduce costs.

Description of drawings

For a more complete understanding of the embodiments and advantages thereof, the following description now refers to the accompanying drawings, in which:

FIG. 1 is a schematic cross-sectional view of a conventional backlight module.

Fig. 2 is an exploded schematic diagram of the positioning structure of the light source module of the present invention.

Fig. 3 is a combined schematic diagram of the positioning structure of the light source module of the present invention.

Fig. 4 is a cross-section AA of Fig. 3 and a partially enlarged schematic diagram.

Fig. 5 is another A-A section and partially enlarged schematic diagram of Fig. 3 .

Fig. 6 is a partial schematic diagram of the guide part in the embodiment of the present invention.

Fig. 7 is another partial schematic diagram of the guide part in the embodiment of the present invention.

FIG. 8 is a partial schematic diagram of a display device in an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are now described in detail below with reference to the accompanying drawings, wherein the accompanying drawings are mainly simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, so only elements related to the present invention are indicated in the accompanying drawings, and The displayed components are not drawn according to the number, shape, size ratio, etc. during implementation, and the specifications and sizes during actual implementation are actually a selective design, and the layout of components may be more complicated.

The following description of various embodiments refers to the accompanying drawings to illustrate specific embodiments according to which the invention may be practiced. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", etc., only refer to the directions in the drawings. Therefore, the directional terms used are used to illustrate and understand the application, but not to limit the application. Also, in the specification, unless it is clearly described to the contrary, the word "comprising" will be understood as meaning including the stated elements, but not excluding any other elements.

Please refer to FIG. 2 , FIG. 3 and FIG. 8 , which are a schematic diagram of a positioning structure of a light source module, a schematic diagram of assembly, and a partial schematic diagram of a display device, respectively, according to an embodiment of the present invention. The present invention discloses the positioning structure of the light source module 200 of the backlight module 300, which includes: a backplane 100 and a light source module 200; Vertical to the bottom plate 110, in this embodiment, the side walls 120 are arranged on both sides of the bottom plate 110, and an accommodating space 130 is formed between the side walls 120 and the bottom plate 110; the side wall 120 is provided with at least one guide portion 140, in this embodiment The sidewalls 120 on both sides of the bottom plate 110 are respectively provided with a guide portion 140 , the guide portion 140 extends obliquely downward toward the accommodating space 130 , and a front end of the guide portion 140 is provided with a positioning protrusion 150 .

The light source module 200 includes a flexible circuit board 210 and a plurality of light sources 220 arranged in sequence 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, and the positioning notch 231 corresponds to The aforementioned positioning protrusion 150 , and the positioning protrusion 150 is fitted and locked in the positioning notch 231 .

During assembly, the flexible circuit board 210 can slide down along the slope of the guide part 140 through the design of the positioning notch 231 of the flexible circuit board 210 and the guide part 140 and the positioning protrusion 150 of the backplane 100 inclined downward and inward. Move to the positioning point, so that the positioning protrusion 150 engages with the positioning notch 231 of the flexible circuit board 210 . This design is to insert the flexible circuit board 210 into the accommodating space 130 of the backplane 100 for positioning and limited assembly, so the entire light source module 200 does not need to be glued and positioned during the assembly process, thereby shortening the assembly or rework time. Increase product production yield, reduce costs, and increase the overall value of the backlight module 300.

In practical applications, the positioning protrusion 150 is formed by extending straight from the front end of the guide part 140 (as shown in FIG. (shown), so as to fit more tightly with the positioning notch 231 of the flexible printed circuit board 210 and fix it.

Please refer to FIG. 6 again. In the implementation and application, it is best to slide the flexible circuit board 210 down to the positioning point along the slope of the guide part 140 so that the positioning protrusion 150 is engaged with the flexible circuit board 210. When the positioning notch 231 is formed, the front end surface 141 of the guide part 140 just abuts against the upper surface of the flexible circuit board 210, so that the flexible circuit board 210 is not only positioned and assembled in the horizontal displacement of the bottom plate 110, but also flexibly The circuit board 210 will not be displaced vertically up and down on the base plate 110 .

In practical applications, the guide portion 140 may include a vertical portion 142 extending upward from the bottom 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 an acute angle, while The inclined portion 143 faces the accommodating space 130 ; the entire guide portion 140 is integrally formed with the back plate 100 , and the front end of the inclined portion 143 is extended with the aforementioned positioning protrusion 150 (as shown in FIG. 6 ).

Please refer to FIG. 7 again. In another implementation application, the guide part 140a can be an element assembled on the side wall 120 of the backplane 100. The guide part 140a has an outer surface 142a and an inner inclined surface 143a. The outer surface 142a and the inner inclined surface An included angle 144a is formed between the surfaces 143a, and the included angle 144a is an acute angle. The inner inclined surface 143a faces the accommodating space 130, and the front end surface 141a of the inner inclined surface 143a is extended with the aforementioned positioning protrusion 150a. By additionally assembling the guide part 140a to the backplane 100 , the guide part 140a can be applied to different models of the backplane 100 without changing the model and process of the backplane 100 .

In an implementation application, the flexible circuit board 210 of the light source module 200 is formed with a plurality of protrusions 241 on the side 240 close to the light source 220 and extending along the long axis direction D1, and these protrusions 241 are formed along the long axis direction D1 Arranged, the convex portion 241 corresponds to the position of each light source 220 on the flexible circuit board 210 . The positioning notch 231 of the flexible circuit board 210 is disposed on the positioning side 230 extending along the minor axis direction D2. The backplane 100 includes a fixed wall 160, and the fixed wall 160 is adjacent to the flexible circuit board 210 and has a plurality of openings 161 formed along the long-axis direction D1.

The protrusions 241 of the flexible circuit board 210 can be correspondingly accommodated in the openings 161 of the fixed wall 160 , and a plurality of recesses 242 are formed between these protrusions 241 , and the depth of these recesses 242 is preferably the depth of the fixed wall 160 . thickness of. During the assembly process, when the flexible circuit board 210 slides down to the positioning point along the slope of the guide part 140, in addition to making the positioning protrusion 150 snap into the positioning notch 231 of the flexible circuit board 210, it is also necessary to The protrusions 241 of the flexible circuit board 210 are correspondingly fitted into the openings 161 of the fixing wall 160 to increase the positioning and limiting of the flexible circuit board 210 .

In an implementation application, the backlight module 300 at least includes a light guide plate 310 , an optical film set 320 and the aforementioned positioned light source module 200 . The light guide plate 310 has a light incident surface 311 and a light exit surface 312 connected to the light incident surface 311 ; The light surface 311 enters the light guide plate 310 and then exits from the light exit surface 312 (as shown in FIG. 8 ).

In practical applications, the fixed wall 160 of the backplane 100 is extended to form a bearing portion 170, which is parallel to the bottom plate 110, and can be used to place the liquid crystal panel 400. The liquid crystal panel 400 is arranged on the light-emitting surface 312 of the light guide plate 310 and the optical film. Above the group 320 , the display device 500 (as shown in FIG. 8 ) is thus formed. The liquid crystal panel 400 is carried and protected by the supporting part 170 , so that friction between the liquid crystal panel 400 and the optical film group 320 can be avoided.

In practical applications, the backlight module 300 includes a reflective sheet 330, which is arranged under the light guide plate 310 to increase the probability that the light emitted by these light sources 220 is reflected to the light exit surface 312, thereby ensuring the light guide plate 200. optical effect.

Through the fitting design of the convex part 241 of the flexible circuit board 210 and the backplane 100, these light sources 210 can be located between the light incident surface 311 of the light guide plate 310 and the fixed wall 160 of the backplane 100. The convex portion 241 and the concave portion 242 of the circuit board 210 are designed, and the convex portion 241 of the flexible circuit board 210 is correspondingly fitted into the opening 161 of the fixed wall 160, so that these light sources 220 on the flexible circuit board 210 can be connected to the fixed wall. The gap g between 160 narrows. According to the technology of the present invention, when the thickness of the fixed 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 about 0.1 mm, so that the frame of the display device 500 further narrowed. Taking the vehicle-mounted display device as an example, when the structural design of the present invention is applied to the vehicle-mounted display device, the frontal edge design can be further narrowed. In addition, since the gap g between these light sources 220 and the fixed wall 160 can be reduced, these light sources 220 can also be designed to be closer to the direction of the fixed wall 160, thereby increasing the effective effect of the light guide plate 310 on the liquid crystal panel 400. In the corresponding range outside the operating area (Active Area, AA area), the light mixing area of these light sources 220 is increased to optimize the lighting taste.

The positioning structure of the light source module designed in the present invention utilizes the positioning convex portion 150 of the guide portion 140 disposed on the back plate 100 and the positioning notch 231 disposed on the flexible circuit board 210 for positioning and positioning, and can be positioned during assembly. The flexible circuit board 210 slides down to the positioning point for fitting and positioning assembly. This assembly process does not require glue positioning, thereby reducing the cost of glue application, shortening the assembly or rework hours, increasing product yield, and reducing costs. Effect. Moreover, the space between the light source 220 and the fixed wall 160 of the backplane 100 can be narrowed through the avoidance design of the backplane 100 and the flexible circuit board 210 , so that the frame of the display device 500 is further narrowed. In addition, the corresponding range of the light guide plate 310 outside the effective operation area (Area AA) of the liquid crystal panel 400 can also be increased, and the light mixing area of the light source 220 can be increased to optimize the lighting quality.

The embodiments disclosed above 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. Anyone skilled in the art can, without departing from the spirit and scope of the present invention, Modifications and changes are made to the above-mentioned embodiments. Any equivalent changes and modifications accomplished by using the content disclosed in the present invention still fall within the scope of the claims of the present application.

[List of Reference Signs]

(known)

10: Backlight module

11: Light guide plate

12: Light source module

12a: Flexible printed circuit board

12b: light source

13: frame

14: Optical diaphragm group

15: reflector

16: Double-sided adhesive tape

G: Gap

(this invention)

100: Backplane

110: bottom plate

120: side wall

130: Accommodating space

140, 140a: guide part

141, 140a: end face

142: Vertical section

143: Inclined part

144: Angle

142a: Outer side

143a: inner inclined surface

144a: included angle

150, 150a: positioning convex part

160: fixed wall

161: opening

170: bearing part

200: light source module

210: flexible circuit board

220: light source

230: positioning side

231: Positioning gap

240: side

241: Convex

242: Concave

300: backlight module

310: light guide plate

311: light incident surface

312: light emitting surface

320: Optical diaphragm group

330: reflector

400: LCD panel

D1: Long axis direction

D2: Minor axis direction

g: gap.

Claims

A light source module positioning structure of a backlight module, comprising:

The back plate, which includes a bottom plate and at least one side wall extending from the periphery of the bottom plate, the side wall is perpendicular to the bottom plate, an accommodation space is formed between the side wall and the bottom plate, and the side wall At least one guide part is provided, the guide part extends obliquely downward towards the accommodating space, and the front end of the guide part is provided with a positioning protrusion; and

The light source module includes a flexible circuit board and a plurality of light sources arranged in sequence on the flexible circuit board. At least one positioning notch is provided on the positioning side of the flexible circuit board, and the positioning notch corresponds to on the positioning protrusion, and the positioning protrusion engages with the positioning notch.
The light source module positioning structure of the backlight module according to claim 1, wherein the positioning convex part is formed by extending straightly from the front end of the guiding part.
The positioning structure of the light source module of the backlight module according to claim 1, wherein the positioning protrusion is formed by the front end of the guiding part extending downward perpendicular to the bottom plate.
The positioning structure of the light source module of the backlight module according to claim 1, wherein the front end surface of the guide part abuts against the flexible circuit board.
The light source module positioning structure of the backlight module according to claim 1, wherein the flexible printed circuit board has a plurality of protrusions formed on the side close to the plurality of light sources and extending 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 arranged on the positioning side extending along the short axis direction, the back plate includes a fixed wall, and The fixed wall is adjacent to the flexible circuit board and has a plurality of openings formed along the long axis direction, and the protrusions are correspondingly accommodated in the openings.
The light source module positioning structure of the backlight module according to claim 5, wherein a plurality of recesses are formed between the plurality of protrusions, and the depth of the plurality of recesses is equal to the thickness of the fixing wall.
The light source module positioning structure of the backlight module according to claim 5, wherein the protrusion corresponds to the position of each light source on the flexible circuit board.
The positioning structure of the light source module of the backlight module according to claim 5 , wherein the fixing wall of the backplane is extended to form a bearing part, and the bearing part is parallel to the bottom plate and for placing the liquid crystal panel.
The light source module positioning structure of the backlight module according to any one of claims 1 to 8, wherein the guide part has a vertical part extending upward from the bottom plate and an inclined part connected to the vertical part, The inclined portion faces the accommodating space, and an included angle is formed between the vertical portion and the inclined portion, and the included angle is an acute angle.
The light source module positioning structure of a backlight module according to any one of claims 1 to 8, wherein the guide portion has an outer surface and an inner inclined surface, and the inner inclined surface faces the accommodating space, so that An included angle is formed between the outer surface and the inner inclined surface, and the included angle is an acute angle.
A backlight module, comprising:

A light guide plate having a light incident surface and a light exit surface connected to the light incident surface; and

The light source module positioning structure according to any one of claims 1 to 10, wherein the light guide plate is arranged on the bottom plate, and the light incident surface is adjacent to the light source module, and the plurality of The light emitted by the light source enters the light guide plate through the light incident surface.
A display device comprising:

The backlight module according to claim 11; and

The liquid crystal panel is arranged on the light emitting surface of the light guide plate.