CN101526186B - Liquid crystal display (LCD), backlight module, fixed structure of backlight module and assembly method thereof - Google Patents

Abstract

The invention discloses a liquid crystal display (LCD), a backlight module and an assembly method thereof, wherein, the backlight module comprises a framework, a luminous strip and a light guide plate. At least one combining piece is arranged on the framework in a convex way, one side of the combining piece is provided with a containing hole, a holding space which is communicated with the containing hole is arranged inside the combining piece, and at least one opening communicated with the holding space passes through the side wall of the combining piece. A circuit plate of the luminous strip is clamped inside the holding space through the containing hole, a luminous source of the luminous strip is arranged at the position of the opening, and the light guide plate is arranged at the position close to the luminous source. A liquid crystal display panel is arranged on the light guide plate, so that the LCD is formed.

Description

Liquid crystal display, backlight module, fixing structure and assembly method of backlight module

technical field

The invention relates to a liquid crystal display, in particular to a liquid crystal display with a backlight module.

Background technique

Liquid crystal displays have become the mainstream of displays in recent years. The liquid crystal displays mainly use a display panel as a display interface, and the light source of the display panel is provided by a light emitting element in a backlight module.

At present, the fixed structure of the backlight module is bent to form a storage space at the bend, and a storage opening is exposed on the side of the fixed structure, and the light bar (light bar) is installed through the opening in a lateral direction. into a fixed structure. In order to maintain the light and thin size of the liquid crystal display, the size of the accommodating opening of the fixed structure is limited and cannot be designed too large, making it difficult for the light-emitting strip to align with the assembly position during installation, and the size of the accommodating opening is too small to cause light emission It is not easy to assemble the strips, etc., and the circuit board of the light strip must use a flexible printed circuit board (Flexible Printed Circuit board, FPC) to facilitate assembly.

The light strips in the prior art must be firmly adhered to the bottom plate of the fixed structure through a back glue. In order to facilitate the assembly work of the assembling workers, the back glue is mostly pre-set on the bottom plate of the fixed structure or the back of the circuit board of the light strip. When the size of the accommodating opening of the fixed structure is too small, the pre-installed back glue will cause the problem of easy sticking during assembly, which not only causes inconvenience to the operators, but also consumes too much time for assembly.

After the light strip is assembled to the fixed structure, the optical components such as the reflector, the light guide plate, and the optical film are arranged on the circuit board of the light strip to complete the assembly of the backlight module. The above-mentioned optical components are arranged at the position of the accommodating opening and adjacent to the light source of the light strip, so as to surely receive the light emitted by the light source. If it is necessary to replace the light strip, the optical components installed in the accommodating opening must be disassembled before the light strip can be removed from the fixed structure, which is time-consuming and complicated in heavy work.

In addition, due to the convenience of assembly, there is a distance between the light strip and the fixed structure in the prior art. However, the design of this distance will cause the heat energy generated by the light strip to be difficult to dissipate. The heat energy of the light strip can only be removed from the The bottom plate which is in close contact with the circuit board conducts to the outside, resulting in poor overall heat dissipation efficiency of the backlight module. In order to improve the heat dissipation of the backlight module, there are two current methods: one is to paste thermal adhesive on the bottom plate corresponding to the position of the light strip, and the other is to use a hard circuit board with better thermal conductivity as the circuit board of the light strip carrier. Although the above two methods can improve the problem of poor heat dissipation of the backlight module, they also make the overall thickness of the backlight module relatively increase, which does not meet the current requirement of thin and light liquid crystal displays.

Contents of the invention

In view of the above problems, the technical problem to be solved by the present invention is to provide a liquid crystal display, a backlight module, a fixing structure and an assembly method of the backlight module, so as to improve the complex and time-consuming assembly steps of the backlight module in the prior art, and the current There are problems such as poor heat dissipation efficiency of the technical backlight module.

To achieve the above purpose, the backlight module disclosed in the present invention includes a fixing structure and a light guide plate. The fixing structure of the backlight module includes a frame and a light-emitting strip, the frame has a bottom plate, and at least one joint piece protrudes from the bottom plate. The coupling part has a receiving opening on the side opposite to the bottom plate, and the inside of the coupling part has a receiving space communicating with the receiving opening, and the side wall of the combining part has at least one opening through which it communicates with the receiving space. The light strip has a circuit board and at least one light source electrically arranged on one side of the circuit board. The circuit board is clamped in the accommodation space through the accommodation opening of the combination part, and the light source is arranged at the opening position of the combination part. The light guide plate is disposed on the bottom plate and adjacent to the light source to form the backlight module of the present invention. A liquid crystal display panel is arranged on the light guide plate to form a liquid crystal display.

Moreover, in order to achieve the above object, the present invention provides a fixing structure of a backlight module, which includes: a frame, the frame has a bottom plate, at least one coupling piece protrudes from the bottom plate, and the coupling piece is opposite to the bottom plate. There is an accommodating opening on one side, and a receiving space communicated with the accommodating opening inside the combining member, the combining member has at least one opening through and communicated with the receiving space; and a light strip, having A circuit board and at least one light source, the light source is electrically arranged on one side of the circuit board, the circuit board is clamped in the accommodation space through the accommodation opening, and the light source is arranged at the opening position .

Moreover, in order to achieve the above object, the present invention provides a liquid crystal display, which includes: a frame, the frame has a bottom plate, at least one coupling piece protrudes from the bottom plate, and the side of the coupling piece opposite to the bottom plate has a An accommodating opening, and the combination part has a storage space connected with the accommodating opening inside, the combination part has at least one opening through, and communicates with the accommodating space; a light emitting strip has a circuit board and at least one light emitting source, the light emitting source is electrically arranged on one side of the circuit board, the circuit board is sandwiched in the receiving space through the accommodating opening, and the light emitting source is arranged at the opening position; a light guide plate , arranged on the base plate, and the light guide plate is adjacent to the light emitting source; and a liquid crystal display panel, arranged on the light guide plate.

Moreover, in order to achieve the above object, the method for assembling the backlight module of the present invention includes the steps of firstly providing a frame, and forming a joint part on the bottom plate of the frame, the joint part has an accommodating opening on the side opposite to the bottom plate, and the inside of the joint part is There is a receiving space communicated with the receiving opening, and at least one opening is provided through the side wall of the coupling piece, and the opening communicates with the receiving space. Next, a light strip is provided, and the light strip has a circuit board and at least one light source electrically arranged on one side of the circuit board. The circuit board of the light-emitting strip is sandwiched in the combination part through the accommodating opening along the first direction, and the light-emitting source is arranged at the position of the opening, and the first direction is perpendicular to the base plate. Finally, a light guide plate is arranged on the bottom plate, and the light guide plate is adjacent to the light emitting source.

The light-emitting strips of the backlight module of the present invention are directly installed into the joint part of the frame from below, thus greatly reducing assembly time and improving production efficiency. When the light strip needs to be replaced, it is only necessary to extract the light strip from the accommodating opening below the frame, which will not affect the optical components already installed on the frame, and the rework is easy. In addition, the front and rear sides of the circuit board of the light strip are respectively clamped and fixed by the joint parts, and the heat dissipation contact area of the light strip is increased to improve the heat dissipation performance of the backlight module and increase the service life of the light source.

Description of drawings

Fig. 1 is the exploded schematic view of the fixing structure of the backlight module of the present invention;

Fig. 2 is the assembled schematic diagram of the fixing structure of the backlight module of the present invention;

Figure 3 is a sectional side view of the frame of the present invention;

Fig. 4 is the exploded schematic diagram of liquid crystal display of the present invention;

FIG. 5 is an exploded schematic diagram of a liquid crystal display of the present invention;

FIG. 6 is a combined schematic diagram of a liquid crystal display of the present invention;

7 is a sectional side view of a liquid crystal display of the present invention;

8A is a schematic diagram of the steps of the assembly method of the backlight module of the present invention; and

FIG. 8B is a schematic diagram of the forming steps of the bonding member of the present invention.

Among them, reference signs:

100: Backlight module 110: Frame

111: Bottom plate 112: Combination piece

1121: First side 1122: Top edge

1123: Second side 1124: Shading film

113: Storage port 114: Storage space

115: Opening 120: Light bar

121: Circuit board 122: Light source

130: reflector 140: light guide plate

150: Optical film 160: Liquid crystal display panel

170: frame 200: liquid crystal display

Step 300: Provide a framework

Step 310: Forming a joint on the bottom plate of the frame

Step 311: Bending the bottom plate of the frame towards a first direction to form a first side

Step 312: Bending the other end connected to the bottom plate from the first side towards the second direction to form the top edge

Step 313: Bending the other end of the top edge connected to the first side in a direction opposite to the first direction to form a second side

Step 320: Providing a light bar

Step 330: Place the circuit board in the receiving space through the receiving opening along the first direction

Step 340: Installing a reflector on the bottom plate of the frame

Step 350: Installing a light guide plate on the reflector

Step 360: Install multiple layers of optical films on the other side of the light guide plate opposite to the bottom plate

Detailed ways

The backlight module of the present invention is applied to the front frame or the back frame of the liquid crystal display. The following will use the backlight module of the present invention to be applied to the back frame of the liquid crystal display of the notebook computer as the description of the embodiment of the present invention, but it does not mean that limit.

As shown in FIGS. 1 to 3 , the fixing structure of the backlight module of the present invention includes a frame 110 and a light-bar 120 (light-bar). The frame 110 has a bottom plate 111, and at least one coupling piece 112 protrudes from the upper surface of the bottom plate 111. This coupling piece 112 can be arranged correspondingly according to the number of backlights used, and is not limited to the number disclosed in this embodiment. , and the material of the frame 110 of the present invention is steel, and those skilled in the art can also choose a suitable alloy material or plastic material, which is not limited thereto. The joint 112 is a structure composed of a first side 1121, a top 1122, and a second side 1123. One end of the first side 1121 is connected to the bottom plate 111, and the other end of the first side 1121 is connected to the bottom plate 111. One end of the top edge 1122 is connected, and the top edge 1122 is perpendicular to the first side edge 1121, the other end of the top edge 1122 is connected to one end of the second side edge 1123, and the second side edge 1123 is connected to the top edge 1122 are perpendicular to each other, and the second side 1123 is parallel to the first side 1121 , and are arranged at intervals due to the connection of the top side 1122 .

Due to the relative connection relationship between the first side 1121, the top side 1122, and the second side 1123, the combination part 112 forms an accommodation on the bottom side of the combination part 112 (ie, the side of the combination part 112 relative to the bottom plate 111). The opening 113 is formed inside the coupling part 112 to form a receiving space 114 communicating with the receiving opening 113 . In addition, at least one opening 115 passing through is opened on the first side 1121 of the coupling member 112 , so that the opening 115 communicates with the receiving space 114 . The number of openings 115 of the present invention can be increased or decreased according to actual usage requirements, and is not limited to the number disclosed in this embodiment. The opening 115 of the present invention may be formed by punching, cutting, or milling, but not limited thereto. Moreover, the processed plate corresponding to the first side 1121 of the opening 115 is bent upward to form the light-shielding sheet 1124 , so that the position of the light-shielding sheet 1124 is adjacent to the opening 115 .

Please continue to refer to FIG. 1 to FIG. 3 , the light strip 120 of the present invention has a circuit board 121 and at least one light source 122 , and the light source 122 is electrically connected and disposed on one side of the circuit board 121 . The circuit board 121 used in the present invention is a hard circuit board of copper-glass fiber-copper (Cu-FR4-Cu), and the combination effect when the light strip 120 is assembled in the joint 112 is relatively ideal, but those skilled in the art, A flexible or flexible printed circuit board (Flexible Printed Circuit board, FPC) can also be used, but not limited thereto. The light strip 120 is installed into the joint 112 from the bottom of the frame 110. The circuit board 121 of the light strip 120 enters the interior of the joint 112 through the accommodating opening 113 at the bottom of the joint 112, and the thickness of the circuit board 121 is the same as that of the joint 112. The distances between the first side 1121 and the second side 1123 are equal, so the circuit board 121 is firmly clamped in the receiving space 114 by the clamping action of the first side 1121 and the second side 1123 . The light emitting source 122 arranged on the circuit board 121 is also installed into the joint 112 along with the circuit board 121. The light emitting source 122 is arranged at the opening 115 of the first side 1121 and exposed outside, so that the light emitting source 122 The emitted light can be projected to the outside.

It is worth noting that since the light source 122 is arranged at the opening 115 of the joint 112, the number of the light source 122 must be the same as or less than the number of the opening 115, so that the light source 122 can be successfully installed in the opening within 115. In addition, the light emitting source 122 of the present invention is a light emitting diode (Light Emitting Diode, LED), and the light emitting source 122 of the present invention uses a top-view light emitting diode, so as to cooperate with the light emitting strip 120 of the present invention to be installed in a combination The combined relationship in the component 112 enables the light source 122 to emit light to a preset position smoothly. Of course, the light source 122 can also be light bulbs and other light sources, and is not limited to this embodiment.

Please refer to the exploded schematic view shown in Figure 4, the backlight module 100 of the present invention includes a fixed structure, a reflector (reflector) 130, a light guide plate (light guide plate) 140, and a plurality of layers of optical films 150, and the liquid crystal display of the present invention 200 is composed of a backlight module 100, a liquid crystal display panel 160, and a plurality of optical components (not shown in the figure). The technical feature of this case lies in the backlight module 100 and its fixed structure, so the applicant will not repeat the details of the liquid crystal display 200 here. optical composition.

The light strip 120 of the backlight module 100 of the present invention is installed into the joint 112 from the bottom of the frame 110, and the circuit board 121 of the light strip 120 enters the interior of the joint 112 through the accommodating opening 113 at the bottom of the joint 112, and is sandwiched in the containment space 114 . The light emitting source 122 disposed on the circuit board 121 is also installed into the joint member 112 along with the circuit board 121 , and the light emitting source 122 is disposed at the opening 115 of the first side 1121 and exposed outside. The reflective plate 130 is disposed on the bottom plate 111 of the frame 110 and adjacent to the light source 122 , the light guide plate 140 is disposed on the reflective plate 130 , and the optical film 150 is disposed on the light guide plate 140 . In addition, a heat-conducting adhesive (not shown in the figure) can be added on the back of the circuit board 121 (the side of the circuit board 121 facing the second side 1123 ), so that the heat generated by the light strip 120 can be self-sustained more quickly. The second side 1123 is diffused so as to improve heat dissipation efficiency.

As shown in FIGS. 4 to 7 , the liquid crystal display panel 160 is installed on the optical film 150 of the backlight module 100 , and then assembled on the outermost side with an outer frame 170 and fixed to form a liquid crystal display 200 . Light emitted from the light source 122 enters the light guide plate 140 , guided by the light guide plate 140 and refracted by the reflector 130 to enter the optical film 150 to provide a light source to the back of the liquid crystal display panel 160 .

Please continue to refer to FIG. 4 to FIG. 7 , and cooperate with the flow charts of the steps in FIG. 8A and FIG. 8B , the method for assembling the backlight module disclosed in the present invention includes the steps of firstly providing a frame 110 (step 300 ), and then forming at least one joint 112 on the bottom plate 111 of the frame 110 (step 310). Wherein, the forming step of the joint 112 includes: the bottom plate 111 of the frame 110 is bent toward a first direction perpendicular to the bottom plate 111 to form a first side 1121 (step 311), and then connected to the bottom plate 111 by the first side 1121 The other end is bent toward a second direction to form a top edge 1122 (step 312), the second direction is perpendicular to the first direction (that is, the second direction is parallel to the bottom plate 111), and finally the top edge 1122 is connected to the first The other end of one side 1121 is bent in a direction opposite to the first direction to form a second side 1123 (step 313 ). The combination piece 112 of the present invention is formed by the above steps, and the first side 1121 and the second side 1123 of the combination piece 112 face each other and are spaced apart so as to form a storage space 114 inside the combination piece 112 and connect with the storage space 114 Through the accommodation port 113.

Then provide a light strip 120 (step 320 ). The light strip 120 has a circuit board 121 and a light source 122 electrically disposed on the side of the circuit board 121 . The circuit board 121 is sandwiched in the receiving space 114 through the receiving opening 113 along a first direction perpendicular to the base plate 111 (installed from below the base plate 111 ) (step 330 ). Set a reflector 130 on the base plate 111 of the frame 110 (step 340), then set the light guide plate 140 above the reflector 130 (step 350), and finally set the multi-layer optical film 150 on the other side of the light guide plate 140 relative to the base plate 111 On the side (step 360), the assembling steps of the backlight module of the present invention are completed.

In the backlight module disclosed by the present invention, the light-emitting strips are directly installed from below into the joint of the frame, so the assembly is fast and the production efficiency can be improved. Moreover, when the light strip needs to be replaced, the operator can directly extract the light strip from the bottom of the frame without affecting the optical components on the frame, making rework easy.

In addition, since the front and rear sides of the circuit board of the light strip are clamped and fixed by the joints respectively, the heat dissipation contact area of the light strip increases, so the heat energy generated by the light source of the light strip can be dissipated quickly, thereby improving the service life of the light source .

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (20)

1. A backlight module, characterized in that, comprising: A frame, the frame has a bottom plate, and at least one coupling piece protrudes from the bottom plate, and the side of the coupling piece opposite to the bottom plate has an accommodating opening, and the inside of the coupling piece communicates with the accommodating opening A storage space, the combination has at least one opening through, and communicates with the storage space, the combination has a first side, a top, and a second side, the first side One end is connected to the bottom plate, the other end of the first side and one end of the second side are respectively connected to the top, and the two sides are arranged at intervals to form the receiving space and the receiving opening, And the opening runs through the first side, wherein the first side and the top are perpendicular to each other, the second side and the top are perpendicular to each other, and the first side and the top are perpendicular to each other. the second sides are parallel to each other; A light strip has a circuit board and at least one light source. The light source is electrically arranged on one side of the circuit board. located at the opening; and A light guide plate is arranged on the bottom plate, and the light guide plate is adjacent to the light emitting source. 2. The backlight module according to claim 1, further comprising a reflective plate disposed on the bottom plate of the frame, and the reflective plate is adjacent to the light emitting source, the light guide plate is disposed on the reflective plate . 3 . The backlight module according to claim 1 , wherein a light-shielding sheet further extends from the first side adjacent to the opening. 4 . 4. The backlight module according to claim 1, wherein the light guide plate is further provided with multiple layers of optical films on the other side of the base plate. 5. The backlight module according to claim 1, wherein the light source is a light emitting diode. 6. The backlight module according to claim 5, wherein the LED is a top-emitting LED. 7. A fixed structure of a backlight module, characterized in that it comprises: A frame, the frame has a bottom plate, and at least one coupling piece protrudes from the bottom plate, and the side of the coupling piece opposite to the bottom plate has an accommodating opening, and the inside of the coupling piece communicates with the accommodating opening A storage space, the combination has at least one opening through, and communicates with the storage space, the combination has a first side, a top, and a second side, the first side One end is connected to the bottom plate, the other end of the first side and one end of the second side are respectively connected to the top, and the two sides are arranged at intervals to form the receiving space and the receiving opening, And the opening runs through the first side, wherein the first side and the top are perpendicular to each other, the second side and the top are perpendicular to each other, and the first side and the top are perpendicular to each other. the second sides are parallel to each other; and A light strip has a circuit board and at least one light source. The light source is electrically arranged on one side of the circuit board. set at the opening. 8 . The fixing structure of the backlight module according to claim 7 , wherein a light-shielding sheet further extends from the first side adjacent to the opening. 9. The fixing structure of the backlight module according to claim 7, wherein the light source is a light emitting diode. 10. The fixing structure of the backlight module according to claim 9, wherein the LED is a top-emitting LED. 11. A liquid crystal display, characterized in that, comprising: A frame, the frame has a bottom plate, and at least one coupling piece protrudes from the bottom plate, and the side of the coupling piece opposite to the bottom plate has an accommodating opening, and the inside of the coupling piece communicates with the accommodating opening A storage space, the combination has at least one opening through, and communicates with the storage space, the combination has a first side, a top, and a second side, the first side One end is connected to the bottom plate, the other end of the first side and one end of the second side are respectively connected to the top, and the two sides are arranged at intervals to form the receiving space and the receiving opening, And the opening runs through the first side, wherein the first side and the top are perpendicular to each other, the second side and the top are perpendicular to each other, and the first side and the top are perpendicular to each other. the second sides are parallel to each other; A light strip has a circuit board and at least one light source. The light source is electrically arranged on one side of the circuit board. located at the opening; a light guide plate is arranged on the bottom plate, and the light guide plate is adjacent to the light emitting source; and A liquid crystal display panel is arranged on the light guide plate. 12. The liquid crystal display according to claim 11, further comprising a reflective plate disposed on the bottom plate of the frame, and the reflective plate is adjacent to the light emitting source, the light guide plate is disposed on the reflective plate . 13 . The liquid crystal display according to claim 11 , wherein a light-shielding sheet further extends from the first side adjacent to the opening. 14 . 14. The liquid crystal display according to claim 11, wherein the other side of the light guide plate opposite to the base plate is further provided with multiple layers of optical films, and the liquid crystal display panel is disposed on the optical films. 15. The liquid crystal display according to claim 11, wherein the light source is a light emitting diode. 16. The liquid crystal display according to claim 15, wherein the LED is a top-emitting LED. 17. A method for assembling a backlight module, comprising the following steps: provide a framework; A joint is formed on a bottom plate of the frame, the joint has an accommodating opening on the side opposite to the bottom plate, and the inside of the joint has a receiving space communicating with the accommodating opening, the joint has at least one opening through which communicates with the containment space; A light strip is provided, the light strip has a circuit board and at least one light source electrically arranged on one side of the circuit board; clamping the circuit board into the receiving space through the receiving opening along a first direction, and setting the light emitting source at the opening position, the first direction is perpendicular to the bottom plate; and a light guide plate is arranged on the bottom plate, and the light guide plate is adjacent to the light emitting source; Wherein, the forming step of the joint further includes: a first side is formed by bending the bottom plate of the frame toward the first direction; The other end connected to the bottom plate by the first side is bent toward a second direction to form a top edge; and The other end connected to the first side by the top side is bent toward a direction opposite to the first direction to form a second side, and the second side is opposite to the first side and arranged at intervals , to form the accommodating space and the accommodating opening, wherein the first side and the top are in a perpendicular relationship, the second side and the top are in a perpendicular relationship, and the first side parallel to the second side. 18. The method for assembling a backlight module according to claim 17, further comprising the step of arranging a reflective plate on the bottom plate of the frame, and the reflective plate is adjacent to the light source, and the light guide plate is set on the reflector. 19. The method for assembling a backlight module according to claim 17, further comprising a step of disposing multiple layers of optical films on the other side of the light guide plate opposite to the bottom plate. 20 . The method for assembling a backlight module according to claim 17 , wherein the opening is formed by stamping, cutting or milling and passes through the first side. 21 .

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