TWI703384B - A backlight module and a display device - Google Patents

Abstract

A backlight module includes a frame, a plurality of illuminating members disposed in the frame, and an optical unit mounted on the frame for emitting light. The frame is formed by bending a bendable circuit board, the bendable circuit board comprising a central portion, and a side wall portion extending integrally by the periphery of the central portion. The illuminating members are spaced in the central region of the bendable circuit board and spaced apart from each other, and the optical unit is not in contact with the illuminating members. The bendable circuit board is bent into the frame, and the plastic frame is not required, and not only can be bent into different sizes, but also the structural design of the thinned and narrow frame is facilitated. The invention also provides a display device including the backlight module.

Description

Backlight module and display device

The invention relates to a display device, in particular to a backlight module and a display device.

The existing backlight module is mainly equipped with a light guide plate in a frame, and a light source is arranged on the light entrance side of the light guide plate, and a plurality of optical films are arranged on the light exit side of the light guide plate, so that the light guide plate totally reflects light The performance of the light source and the microstructure of the light-emitting surface, so that the light emitted by the light source can be evenly dispersed after passing through the light guide plate, and then the light emitted from the light-emitting surface of the light guide plate is further diffused, dispersed and brightened by the optical film. The panel provides a backlight with uniform brightness.

In the existing structure, a plastic frame is usually installed on the periphery of the optical film to limit the position, and then the plastic frame is combined with a circuit board on which a plurality of light-emitting elements are arranged. However, the above design will cause the frame edge size and thickness of the overall backlight module to be too large, which is not conducive to the structural design of the backlight module and the display device toward thinness and narrow frame. In addition, the production of plastic frames also requires mold design and mold opening and mold trial operations, which affects the development timeliness.

Therefore, one objective of the present invention is to provide a backlight module with a thinner overall structure and narrower frame.

The backlight module of the present invention includes a frame, a plurality of light-emitting elements arranged in the frame, and an optical unit that is placed on the frame to provide light. The frame is formed by bending a bendable circuit board. The bendable circuit board includes a central area and a side wall area integrally bent and extended from the periphery of the central area. The light-emitting elements are arranged at intervals in the central area of the bendable circuit board, and the optical unit is not in contact with the light-emitting elements.

Another technical means of the present invention is that the side wall area has a first side wall portion integrally bent and extended from the periphery of the central area, and a first side wall portion integrally bent and extended away from the center The second side wall part extending outward in the direction of the zone.

Another technical means of the present invention is that the side wall area has a plurality of bending sections extending radially outward from the edge of the central area, and each bending section has an inner bending section connected to the central area. Section, an outer bending section connected to the end of the inner bending section, a valley fold line for separating the central area and the inner bending section, and a valley fold line for separating the inner bending section and the outer bending section The inner bending part is bent according to the valley folding line to form a first side wall part, and the outer bending part is bent according to the mountain folding line to jointly form a second side wall part The second side wall portion extends outward in a direction away from the central area, and the frame further includes a plurality of reinforcing pieces, and each reinforcing piece is used to combine two adjacent bending sections.

Another technical means of the present invention is that each reinforcing piece is fixed on the inner bending portion of two adjacent bending sections.

Another technical means of the present invention is that at least one perforation is formed on the inner bending portion of each bending section, and each reinforcing piece has a body section, two two ends respectively connected to the body section and having a width A neck section smaller than the body section, and two joint sections respectively connected to the ends of the two neck sections and having a maximum width larger than the two neck sections. The maximum width of each joint section is greater than the width of each perforation, and each reinforcement The sheet is a perforation inserted into the two adjacent inner bending parts by the two combined sections respectively.

Another technical means of the present invention is that the reinforcing sheet extends outward from the end of the inner bending section of the bending portion, and has a body section connected to the inner bending section, and a connection A neck section of the body section with a width smaller than the body section, and a joint section connected to the end of the neck section and having a maximum width greater than the neck section, and the other end of the inner bending section is formed with a perforation, each The maximum width of the joint section of the reinforcing sheet is greater than the width of each perforation, and each reinforcing sheet is a perforation inserted into the adjacent inner bending part by the joint section.

Another technical means of the present invention is that the frame further includes a plurality of abutting members arranged at intervals in the central area of the bendable circuit board, and the height of the abutting members is greater than the height of the light-emitting member , The optical unit is supported and positioned together by the abutting member.

Another technical means of the present invention is that the optical unit is supported and positioned by the side wall area.

Another technical means of the present invention is that the bendable circuit board further includes a connection area extending from the sidewall area to form an electrical connection with an external component.

Another object of the present invention is to provide a display device including the aforementioned backlight module.

The display device of the present invention includes the aforementioned backlight module and a display panel arranged on the backlight module.

Another technical means of the present invention is that the display device further includes an adhesive member disposed on the side wall area of the bendable circuit board, and the display panel is fixed on the side wall area through the adhesive member .

The effect of the present invention is that a bendable circuit board is used to bend into a frame for holding the optical unit, which can be bent into different sizes as required, and is also conducive to the structural design of thinness and narrow frame.

The features and technical content of the related patent applications of the present invention will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. Before detailed description, it should be noted that similar elements are represented by the same numbers.

Referring to FIG. 1, a preferred embodiment of the backlight module of the present invention includes a frame 2, a plurality of light emitting elements 5 arranged in the frame 2, and an optical unit 7 placed on the frame 2 to provide light. . Among them, the optical unit 7 can be selected as a light guide plate, a light guide film and/or a combination of a plurality of optical films according to requirements.

Wherein, the frame 2 is formed by bending a bendable circuit board 3, and the bendable circuit board 3 includes a central area 31 and a side wall area 32 bent and extended from the periphery of the central area 31, And a connection area 33 extending from the sidewall area 32 to form an electrical connection with an external element (not shown). The light emitting elements 5 are arranged in the central area 31 of the bendable circuit board 3 at intervals.

Referring to FIG. 2, one of the forming methods of the frame 2 is to directly press and form the bendable circuit board 3, so that the side wall area 32 has a second part that is integrally bent and extended from the periphery of the central area 31 One side wall portion 321 and a second side wall portion 322 integrally bent by the first side wall portion 321 and extending outwardly away from the central area 31.

Referring to FIG. 3, another forming method of the frame 2 is to bend the bendable circuit board 3 and then fix the forming. The side wall area 32 has four bending sections 323 extending radially outward from the edge of the central area 31, and each bending section 323 has an inner bending portion 324 connected to the central area 31. An outer bending portion 325 connected to the end of the inner bending portion 324, a valley folding line for separating the central area 31 and the inner bending portion 324, and a valley folding line for separating the inner bending portion 324 and the inner bending portion 324 The mountain fold line of the outer bending part 325. It should be noted that the dotted dotted line with a short line and a point in series is represented as a valley fold line (VALLEY FOLD), that is, it is bent upward along the valley fold line, and the valley fold line is in a concave state after bending; plural equal lengths The dashed line connected by the short line represents the MOUNTAIN FOLD, which is bent downward along the mountain fold line, and the mountain fold line is exposed and protruding after bending. The four inner bending portions 324 are connected together after being bent along the valley folding line to form the first side wall portion 321 as shown in FIG. 2, and the four outer bending portions 325 are connected together after being bent along the mountain folding line. The second side wall portion 322 as shown in FIG. 2 is formed. In addition, it should be particularly noted that the valley fold line and the mountain fold line are drawn to illustrate the bending method of this embodiment. In fact, the bendable circuit board 3 may not display the valley fold line and the mountain fold line. The mountain polyline. In a preferred embodiment of the present invention, among the four bending sections 323 of the side wall area 32, between two adjacent bending sections 323, after bending, the adjacent inner bending sections are preferably The portions 324 are in contact with each other, and the adjacent outer bending portions 325 are in contact with each other. By relying on each other, a better support strength can be achieved. However, according to the requirements of different products, the adjacent inner bending portions 324 or The adjacent outer bent portions 325 are not completely joined to form a continuous side wall area 32.

In addition, referring to FIG. 4, the frame 2 further includes four reinforcing sheets 4, which are used in conjunction with the bendable circuit board 3 formed by bending. After the bending of the bendable circuit board 3 is completed, the two ends of the reinforcing sheet 4 are respectively connected to the two adjacent bending sections 323, that is, to the bendable circuit board 3 The corner position is used to fix the shape of the bendable circuit board 3 and at the same time enhance the strength of the overall structure of the bendable circuit board 3. The reinforcing sheet 4 can be combined in the following ways.

Among them, the first method is as shown in FIG. 4, the reinforcing sheet 4 is an independent element, which is directly bonded to the inner bending portion 324 of two adjacent bending sections 323 by bonding or nailing. on.

The second method is as shown in FIG. 5, each inner bending portion 324 is formed with a through hole 320, and each reinforcing sheet 4 is an independent element, and has a body section 41 and two are respectively connected to the body section. The two ends of the neck section 41 have a width smaller than that of the body section 41, and the two joint sections 43 respectively connected to the ends of the two neck sections 42 and whose maximum width is greater than the two neck sections 42, and each joint section 43 has The maximum width is greater than the width of each perforation 320. After each reinforcing piece 4 is bent at an angle close to a right angle, the two joining sections 43 are respectively inserted into the through holes 320 on two adjacent inner bending portions 324. Because the reinforcing sheet 4 has a slight flexibility, when the connecting section 43 passes through the corresponding perforation 320, it can be slightly bent to make it pass through the perforation 320 and then return to its original shape, and pass through the perforation 320. A structural design in which the maximum width of the coupling section 43 is greater than the width of each perforation 320, so that the coupling section 43 can be used for card production after passing through the corresponding perforation 320 without falling off, as shown in FIG. 6 The combined state.

The third way is as shown in Figure 7. The reinforcing sheet 4 directly extends outward from the ends of the inner bent portion 324, and has a body section 41 and a body section 41 connected to the inner bent portion 324. A neck section 42 connected to the body section 41 and having a width smaller than that of the body section 41, and a joint section 43 connected to the end of the neck section 42 and having a maximum width larger than the neck section 42, and the inner bending portion 324 A through hole 320 is formed at the other end. That is, in this embodiment, one end of each inner bending portion 324 has the reinforcing member, and the other end is formed with a through hole 320. The maximum width of the joint section 43 of each reinforcing sheet 4 is greater than the width of each perforation 320. Therefore, after each reinforcing piece 4 is bent, the connecting section 43 can be inserted into the through hole 320 on the adjacent inner bent portion 324 without falling off. The above-mentioned three fixing methods of the bent circuit board 3 can achieve the effect of strengthening the structural strength of the frame 2. Among them, the second and the third selected sheet-like reinforcing sheet 4 can also be used for the thin frame. The thickness of the narrow frame effect; in addition, the reinforcing piece 4 directly extended from the bendable circuit board 3, during the installation process, the assembler only needs to align the hole position once, which can simplify the assembly procedure and shorten the assembly time.

In addition, the optical unit 7 can also be arranged in two ways. The first one is shown in Fig. 8, which is supported and positioned by the side wall area 32, so that the optical unit 7 is located on the light emitting side of the light emitting element 5. This not only increases the light mixing distance, but also uses the side wall area 32. When the outer bending portion 325 of the optical unit 7 bears the outer periphery of the optical unit 7, the area of the outer bending portion 325 contacting the optical unit 7 is relatively large, and the optical unit 7 can be further coated with glue to fix the optical unit 7 on the frame 2. , Improve the stability of the combination. The second method is as shown in FIG. 9, through a plurality of spacers arranged in the central area 31 of the bendable circuit board 3 (only one is shown due to the viewing angle). The height of the member 6 is greater than the height of the light-emitting member 5. The optical unit 7 is supported and positioned together by the abutment member 6, and the optical unit 7 is accommodated in the frame under the premise of reaching a sufficient light mixing distance The internal space of 2 has a better limiting effect, and can also achieve the purpose of thinning the backlight module. The above two arrangement methods can achieve the effect of positioning the optical unit 7 and can prevent the optical unit 7 from directly contacting the light-emitting element 5.

Referring to FIG. 10, a preferred embodiment of the display device of the present invention includes a backlight module as shown in FIG. 9, an adhesive member 8 arranged on the bendable circuit board 3, and a display panel 9. The The display panel 9 is fixed on the bendable circuit board 3 through the adhesive 8.

In summary, the present invention directly punches or bends the bendable circuit board 3 out of the main structure of the frame 2 by stamping or bending, and can omit the plastic frame and glue the plastic frame. Adhesive parts, saving material cost and assembly process. In addition, the bending forming method does not require additional mold design, mold opening, mold trial and other operations, which saves development time and cost. It can also cut the bendable circuit board according to different product requirements. The template of 3 determines the width of the side wall area of the frame, and has more product adaptability.

However, the foregoing are only preferred embodiments of the present invention, and should not be used to limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the description of the invention, All are still within the scope of the invention patent.

2: frame 3: Bendable circuit board 31: Central District 32: Side wall area 320: perforation 321: first side wall part 322: second side wall part 323: bending section 324: Internal bending part 325: Outer bending part 33: Connection area 4: Reinforcing film 41: body segment 42: neck 43: combined segment 5: Light-emitting parts 6: Top piece 7: Optical unit 8: Pasting parts 9: Display panel

FIG. 1 is a perspective exploded view, which is a preferred embodiment of the backlight module of the present invention; Figure 2 is a schematic diagram illustrating a process of forming a bendable circuit board by stamping; FIG. 3 is a schematic diagram illustrating that the bendable circuit board is formed by folding paper, and the figure shown in the figure is the unfolded state of the bendable circuit board; Fig. 4 is a partial perspective view illustrating the state of the bendable circuit board formed by folding paper, and a reinforcing sheet is combined with one of the corners; Figure 5 is a partial three-dimensional exploded view illustrating the second form of the reinforcing sheet; Figure 6 is a partial perspective view illustrating the combination of Figure 5; Figure 7 is a partial plan view illustrating the third form of the reinforcing sheet; 8 is a partial schematic side view illustrating the combination of the backlight module of the present invention, in which an optical unit is supported and positioned by the side wall of the bendable circuit board; 9 is a partial schematic side view illustrating another combination of the backlight module of the present invention, in which the optical unit is supported and positioned by a plurality of abutting members; and FIG. 10 is a partial schematic side view showing a preferred embodiment of the display device of the present invention.

2: frame

3: Bendable circuit board

31: Central District

32: Side wall area

33: Connection area

7: Optical unit

Claims (10)

A backlight module includes: a frame formed by bending a bendable circuit board. The bendable circuit board includes a central area and a side wall area integrally bent and extended from the periphery of the central area , Wherein the side wall area has a first side wall portion integrally bent and extended from the peripheral edge of the central area, and a first side wall portion integrally bent and extended from the first side wall portion away from the central area The second side wall part; a plurality of light-emitting elements are arranged at intervals in the central area of the bendable circuit board; and an optical unit, which is placed on the frame to provide light, and the optical unit is not connected to the light-emitting Piece contact. According to the backlight module of claim 1, wherein the side wall area has a plurality of bending sections radially extending outward from the edge of the central area, and each bending section has a connection to The inner bending portion of the central area, an outer bending portion connected to the end of the inner bending portion, a valley folding line for separating the central area and the inner bending portion, and a valley fold line for separating the inner bending portion The folding part and the mountain fold line of the outer folding part, the inner folding part is bent according to the valley folding line to form the first side wall part, and the outer bending part is folded according to the mountain folding line. The second side wall portion is formed, and the second side wall portion extends outward in a direction away from the central area, and the frame further includes a plurality of reinforcing pieces, and each reinforcing piece is used to combine two adjacent ones The bending section. According to the backlight module described in item 2 of the scope of patent application, each of the reinforcing sheets is fixed on the inner bending portion of two adjacent bending sections. The backlight module according to item 2 of the scope of patent application, wherein at least one perforation is formed on the inner bending portion of each bending section, and each reinforcing sheet has a body section and two are respectively connected to The two ends of the body section have a width smaller than the neck section of the body section, and two joint sections respectively connected to the ends of the two neck sections and whose maximum width is greater than the two neck sections. The maximum width of each joint section is greater than The width of each perforation is the perforation in which the two joining sections are inserted into the two adjacent inner bending parts. The backlight module according to item 2 of the scope of patent application, wherein the reinforcing sheet respectively extends outward from the end of the inner bending section of the bending portion, and has a connection to the inner bending section The body section, a neck section connected to the body section and having a width smaller than the body section, and a joint section connected to the end of the neck section and having a maximum width greater than the neck section, and the other end of the inner bending section A perforation is formed, the maximum width of the joint section of each reinforcing piece is greater than the width of each perforation, and each reinforcing piece is a perforation inserted into the adjacent inner bending part by the joint section. According to the backlight module of any one of items 1 to 5 of the scope of patent application, the frame further includes a plurality of abutting members arranged at intervals in the central area of the bendable circuit board, and the top The height of the abutment member is greater than the height of the light-emitting member, and the optical unit is supported and positioned together by the abutment member. According to the backlight module according to any one of items 1 to 5 of the scope of patent application, the optical unit is supported and positioned by the side wall area. According to the backlight module described in item 1 of the scope of patent application, the bendable circuit board further includes a side wall area extending outward from the side wall area to form an electrical connection with an external component Connection area. A display device includes: a backlight module as described in any one of items 1 to 8 in the scope of patent application; and a display panel arranged on the backlight module. According to the 9th item of the scope of patent application, the display device further includes an adhesive member disposed on the side wall area of the bendable circuit board, and the display panel is fixed on the side wall area through the adhesive member .

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