CN100405179C - Backlight module and display device using same - Google Patents

Abstract

A backlight module comprises a back plate, a positioning structure and a component to be positioned. The back plate is provided with a back surface and a front surface, and a positioning hole penetrates through the front surface and the back surface. The positioning structure is provided with a first positioning part which penetrates through the positioning hole from the front side and protrudes out of the back side. The component to be positioned is positioned on the back surface by the first positioning part.

Description

Backlight module and display device using same

technical field

The present invention relates to a backlight module and a display device using the same, and in particular to a backlight module with a multi-reset structure and a display device using the same.

Background technique

With the progress of the flat-panel display industry, although the cost of the flat-panel display is reduced, the profit of the product is also reduced as the production technology matures and leads to mass production. Therefore, we must strive to simplify the design of each part of the product, and omit components while maintaining the proper functions to reduce costs.

Traditionally, a backlight module in a liquid crystal display has many components, such as a lamp tube, a diffuser, a circuit board, an inverter, a cover, and the like. These components must be correctly positioned and fixed on the backlight module, so an appropriate positioning structure must be designed to position and fix each component. Usually, different positioning structures must be designed according to these components, which not only increases the manufacturing cost, but also consumes more manpower and time in assembly.

Contents of the invention

In view of this, the object of the present invention is to provide a backlight module and a display device using the same, which can simultaneously position various components on the backlight module, save the cost of producing different positioning parts, and save manpower and time for assembly.

According to the purpose of the present invention, a backlight module is proposed, which includes a backplane, a positioning structure and a component to be positioned. The backboard has a back side and a front side, and a positioning hole runs through the front side and the back side. The positioning structure has a first positioning portion, which passes through the positioning hole from the front and protrudes from the back. The component to be positioned is positioned on the back surface by the first positioning portion.

According to the object of the present invention, a display device is provided, which includes a display panel, a front frame and a backlight module. The backlight module includes a backboard, a positioning structure and a component to be positioned. The backboard has a backside and a front side, the backboard and the front frame sandwich the display panel, and a positioning hole runs through the front side and the backside. The positioning structure has a first positioning portion, which passes through the positioning hole from the front and protrudes from the back. The component to be positioned is positioned on the back surface by the first positioning portion.

In order to make the above-mentioned purposes, features, and advantages of the present invention more comprehensible, a preferred embodiment is specifically cited below, together with the accompanying drawings, as follows:

Description of drawings

FIG. 1A shows a schematic cross-sectional view of a display device of the present invention;

Figure 1B shows a partially enlarged view of the positioning structure of Figure 1A;

Figure 1C shows a plan view of the first positioning portion and the positioning hole of Figure 1A; and

Fig. 2 shows a partially enlarged view of another positioning structure of the present invention.

Explanation of main component symbols

100: display device

110: display panel

112: Upper polarizing film

114: lower polarizing film

120: front frame

140: Backlight module

150: Backplane

152: back

154: front

156: reflector

158: positioning hole

158a: opening

158b: Slit

160, 260: positioning structure

162, 262: The first positioning department

164: The second positioning department

165: Support Department

166: Junction

170: Optical components

180: light tube

190: printed circuit board

192: cover

194: Holes

290: Component to be positioned

Detailed ways

Please refer to FIG. 1A , which shows a schematic cross-sectional view of the display device of the present invention. The display device 100 includes a display panel 110 , a front frame 120 and a backlight module 140 . In this embodiment, the display device 100 is a liquid crystal display device, the display panel 110 is a liquid crystal display panel, and the upper polarizing film 112 and the lower polarizing film 114 are attached to the upper surface and the lower surface of the liquid crystal display panel respectively. The backlight module 140 includes a back plate 150 , a positioning structure 160 , an optical component 170 , a light tube 180 and components to be positioned. In this embodiment, the components to be positioned include a printed circuit board (printed circuit board, PCB) 190 and its covering (shielding plate) 192. The covering 192 covers the printed circuit board 190 and is fixed on the backplane 150 in a screwed or clamped manner. 152 on the back side. The optical component 170 can be a diffusion sheet, an enhancement sheet, a prism sheet or a diffusion plate, and the printed circuit board 190 can be an inverter. The backplane 150 has a backside 152 and a front side 154 , the backplane 150 and the front frame 120 sandwich the display panel 110 and the optical component 170 , and a reflective sheet 156 is disposed on the front side 154 . Please refer to FIG. 1B again, which shows a partially enlarged view of the positioning structure in FIG. 1A . A positioning hole 158 runs through the front 154 and the back 152 . Please refer to FIG. 1C , which shows the combination relationship between the first positioning portion 162 and the positioning hole 158 in FIG. 1A . The positioning structure 160 has a first positioning portion 162 , the first positioning portion 162 passes through the positioning hole 158 from the front side 154 and protrudes from the back side 152 . Since the positioning hole 158 is composed of an opening 158a and a slit 158b, after the first positioning part 162 passes through the backboard 150 through the opening 158a, it translates to the end of the slit 158b to engage the component to be positioned on the backboard . In addition to what is shown in FIG. 1C , the combination relationship between the first positioning portion 162 and the positioning hole 158 can also have various changes. For example, the first positioning portion 162 can be, for example, a tenon structure similar to the joint portion 166 in FIG. 1A , but has a longer length H1. The length H1 can be adjusted according to the overall thickness of the components to be positioned, so as to engage single-layer or multi-layer components to be positioned according to actual needs. The first positioning part 162 is formed by such as elastic material such as plastics, and after the first positioning part 162 produces a temporary deformation and passes through the positioning hole 158, a recovery stress is generated to return to the original shape; the first positioning part 162 also It can have the same shape as the positioning hole 158 such as rectangle, ellipse, triangle or polygon, and after the first positioning part 162 passes through the positioning hole 158 from the front side 154 and protrudes from the back side 152, then passes through Rotate at 90 degrees or rotate at other angles according to the shape of the first positioning portion 162 to engage the component to be positioned on the backboard. As shown in FIG. 1B , the components to be positioned, including the printed circuit board 190 and the cover 192 are positioned on the back surface 152 by the first positioning portion 162 . As shown in FIG. 1A, the positioning structure 160 also includes a second positioning portion 164 and a supporting portion 165. The second positioning portion 164 is used to position the lamp tube 180 on the front side 154, and the supporting portion 165 is used to support the optical assembly 170 on the front side. 154 above. The positioning structure 160 also includes a combining portion 166, such as a hook. The joint portion 166 passes through the back panel 150 from the front side 154 and protrudes from the back side 152 to combine the positioning structure 160 with the back panel 150 .

In this embodiment, the first positioning portion 162 is an overhanging portion, and the printed circuit board 190 and the cover 192 are located between the overhanging portion and the back surface 152 for positioning the printed circuit board 190 on the back surface 152 . The cover 192 also has a hole 194 , and part of the overhanging portion protrudes from the cover 192 through the hole 194 , so that the overhanging portion can position the cover 192 on the back surface 152 .

However, those skilled in the technical field to which the present invention pertains will understand that the present invention is not limited thereto. For example, although the present invention is described by taking the direct type backlight module as an example, it can also be applied to the side light type backlight module. The positioning structure 160 can be a plastic component manufactured by injection molding. The positioning structure 160 of this embodiment can also omit the joint portion 166 , and fix the positioning structure 160 on the back plate 150 by screwing or clamping the components to be combined, such as the cover 192 , on the back plate 150 . In this way, the bonding strength of the positioning structure 160 can be further strengthened, and at the same time, the problem of scraping caused by the interference between the bonding portion 166 and the back plate 150 can be avoided. The positioning structure 160 does not need to avoid other components on the backplane 150 , so the structural design can be more flexible.

In addition, please refer to FIG. 2 , which shows a partially enlarged view of another positioning structure of the present invention. The present invention also proposes a positioning structure 260, the first positioning portion 262 of the positioning structure 260 is a cantilever, the component to be positioned 290 and the cover 192 are located between the cantilever and the back surface 152, the cantilever passes through the back plate 150 and is inserted into the hole 194 The cover 192 and the component to be positioned 290 are fixed on the back surface 152 . But the cantilever can also be used to clamp the edge of the cover 192 and the component to be positioned 290 on the back surface 152 . Therefore, as long as the length H2 of the first positioning portion 262 is adjusted according to actual needs, different positioning functions can be completed.

The backlight module disclosed in the above embodiments of the present invention and the display device using the same have a multi-position structure, which can fix more than one type of components, including lamp tubes, printed circuit boards, covers and so on. The cost of producing different positioning parts can be saved, and the manpower and time of assembly can be saved. Since the positioning structure adopts plastic injection molding, it can realize the shape that the positioning structure of traditional sheet metal processing is difficult to achieve, so as to meet the needs of special positioning functions.

In summary, although the present invention has been disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Those skilled in the art of the present invention can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be defined by the claims.

Claims (19)

1. A backlight module, comprising: A back plate has a back side and a front side, and a positioning hole runs through the front side and the back side; A positioning structure has a first positioning portion, the first positioning portion passes through the positioning hole from the front side and protrudes from the back side; and A component to be positioned is positioned on the back surface with the first positioning portion, It also includes a cover, which covers the component to be positioned and is fixed on the back. 2. The backlight module according to claim 1, wherein the cover is fixed on the back surface by screwing or clamping. 3. The backlight module according to claim 1, wherein the first positioning portion is a protruding portion, and the component to be positioned and the cover are located between the protruding portion and the back surface. 4 . The backlight module according to claim 3 , wherein the cover further has a hole, and part of the overhanging portion protrudes from the cover through the hole. 5. The backlight module according to claim 1, wherein the first positioning portion is a cantilever, and the component to be positioned and the cover are located between the cantilever and the back surface. 6. The backlight module according to claim 1, wherein the positioning structure further comprises a second positioning portion for positioning a light tube on the front surface. 7. The backlight module according to claim 1, wherein the positioning structure further comprises a support portion for supporting an optical component on the front surface. 8. The backlight module according to claim 1, wherein the positioning structure further comprises a joint portion, the joint portion passes through the back plate from the front side and protrudes on the back side, so as to combine the positioning structure with the back plate . 9. The backlight module according to claim 1, which is a direct-lit backlight module or a side-emitting backlight module. 10. A display device comprising: a display panel; a front frame; and A backlight module, including: A back plate has a back and a front, the back plate and the front frame sandwich the display panel, and a positioning hole runs through the front and the back; A positioning structure has a first positioning part, the first positioning part passes through the positioning hole from the front side and protrudes on the back side; and A component to be positioned is positioned on the back surface with the first positioning portion, It also includes a cover, which covers the component to be positioned and is fixed on the back. 11. The display device according to claim 10, wherein the cover is fixed on the back surface by screwing or clamping. 12. The display device according to claim 10, wherein the first positioning portion is a protruding portion, and the component to be positioned and the cover are located between the protruding portion and the back surface. 13 . The display device according to claim 12 , wherein the cover further has a hole, and a part of the overhang portion protrudes from the cover through the hole. 14 . 14. The display device according to claim 10, wherein the first positioning portion is a cantilever, and the component to be positioned and the cover are located between the cantilever and the back surface. 15. The display device according to claim 10, wherein the positioning structure further comprises a second positioning portion for positioning a light tube on the front surface. 16. The display device according to claim 10, wherein the positioning structure further comprises a support portion for supporting an optical component on the front surface. 17. The display device according to claim 10, wherein the positioning structure further comprises a joint portion, the joint portion passes through the back plate from the front side and protrudes on the back side, so as to combine the positioning structure with the back plate . 18. The display device according to claim 10, which is a direct-lit backlight module or a side-emitting backlight module. 19. The display device according to claim 10, which is a liquid crystal display device, the display panel is a liquid crystal display panel, and an upper polarizing film and a lower polarizing film are attached to the upper surface and the lower surface of the liquid crystal display panel respectively.

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