CN100374930C - Direct type backlight module - Google Patents

Abstract

The invention discloses a direct type backlight module, which at least comprises a bottom plate and a lamp tube. The bottom plate is provided with at least one bottom plate opening, and the bottom plate opening is provided with a first periphery and a second periphery. The bottom plate comprises a bottom plate main body, at least one inclined side plate and a protruding part. The inclined side plate extends upwards from one side of the bottom plate main body. The protruding part is arranged on the outer side of the bottom plate corresponding to the opening position of the bottom plate, and part of the periphery of the protruding part is formed on the first periphery of the opening of the bottom plate. The lamp tube is arranged on the bottom plate main body.

Description

Direct type backlight module

technical field

The present invention relates to a direct-type backlight module (bottom lighting module) applied to a display panel, in particular to a direct-type backlight module with high heat dissipation effect.

Background technique

Liquid crystal display (LCD, Liquid Crystal Display) technology has always been used in portable electronic products such as notebook computers, mobile phones, digital cameras, camcorders, and PDAs. In addition to these smaller portable products, the manufacturing technology of large-sized LCD panels has also matured recently. For example, desktop LCD monitors are gradually replacing CRT screens. LCD TVs are currently competing with traditional TVs in the market due to their advantages of light and small size. LCD panel (LCD panel) is a kind of non-self-illuminating display panel (display panel), which does not emit light by itself, and needs to be displayed through the setting of a backlight source. There are many backlight technologies now, and in large-size (about 20 o'clock or more) liquid crystal display products, a direct-type backlight module (bottom lighting module) is often used as the backlight of the liquid crystal panel.

Please refer to FIG. 1 . FIG. 1 is a schematic side sectional view of a conventional backlight module. In liquid crystal display products, the backlight module 10 is disposed directly below a liquid crystal panel 12 and includes a plurality of lamp tubes 14 , a diffuser plate 16 and a back bezel 20 . As shown in FIG. 1 , a plurality of lamp tubes 14 for providing light sources in the backlight module 10 are arranged parallel to each other and arranged directly under the liquid crystal panel 12 , hence the name of the "direct type" backlight module 10 . The diffuser plate 16 is disposed between the lamp tube 14 and the liquid crystal panel 12 , and can diffuse the light from below to provide the liquid crystal panel 12 with more evenly dispersed light. Multiple layers of optical films 18 are usually laid on the diffuser plate 16, which are placed from bottom to top in the order of lower diffuser, lower brightness enhancement sheet, upper brightness enhancement sheet, and upper diffusion sheet to increase the overall light of the liquid crystal display product. Uniformity and Brightness.

The base plate 20 is disposed under the diffuser plate 16 , and includes a base plate main body 201 and a plurality of inclined side plates 203 ; in large-sized liquid crystal display products, the base plate 20 is usually manufactured by stamping metal. The top of the inclined side plate 203 is used to support the diffuser plate 16 . The lamp tube 14 is disposed on the base plate main body 201 . However, because the lamp tube 14 is the main heat source of the backlight module 10 , it usually does not directly contact the bottom plate main body 201 , but the lamp tube 14 is erected by setting a lamp tube frame (not shown in the figure). In addition, in order to utilize the light generated by the lamp tube 14 more effectively, the surface of the bottom plate 20 is usually laid with a reflective sheet (not shown) or coated with a highly reflective material, so that the light from the lamp tube 14 is reflected upwards. , to increase the utilization of light.

As mentioned above, the direct-lit backlight module 10 is usually used in large-sized liquid crystal display products, and the diffuser plate 16 and the bottom plate 20 shown in FIG. 1 usually form a closed space. On the other hand, liquid crystal display products also emphasize the thinning of their products, so the backlight module 10 also needs to comply with the thinning, so the above-mentioned enclosed space is usually quite narrow.

One of the key factors affecting the display quality of liquid crystal display products is display brightness. Wherein, the more the number of lamp tubes 14 is, the display brightness of the liquid crystal display product can be directly improved. However, the light tube 14 is not only a light source, but also a heat source. However, according to the above, the space for accommodating the light tube 14 in the backlight module 10 is not only narrow, but also usually a closed space, so the heat dissipation effect is limited. The heat generated by the backlight module 10 during operation often cannot be dissipated smoothly, and will continue to accumulate. Once the operation time is longer, it is easy to cause the temperature near the lamp tube 14 to be too high. This will not only affect the normal operation of the liquid crystal panel 12, but also cause a decrease in display quality (for example, images in some areas tend to flicker or flicker), and it is more likely to greatly reduce the service life of surrounding components.

Therefore, how to improve the heat dissipation capability of the backlight module 10, so that the backlight module 10 can accommodate more lamp tubes under the double trend of liquid crystal display products 1) increasing in size; 2) increasing the display brightness requirements 14, and at the same time improve the known problems of display quality and component service life caused by the above-mentioned poor heat dissipation effect, which is actually an important issue faced by the current technology.

Contents of the invention

The main purpose of the present invention is to provide a direct type backlight module with high heat dissipation effect.

Another object of the present invention is to provide a direct type backlight module, which can improve the display quality problem caused by the poor heat dissipation effect of the conventional backlight module.

Another object of the present invention is to provide a direct-lit backlight module, which can improve the lifespan of components in conventional backlight modules caused by poor heat dissipation.

In order to achieve the above object, the present invention proposes a direct-lit backlight module, which at least includes a bottom plate and a lamp tube; the bottom plate is provided with at least one bottom plate opening, and the bottom plate opening has a first periphery and a second periphery; the bottom plate includes a The main body of the bottom plate, at least one inclined side plate and a protrusion; the inclined side plate extends upward from one side of the main body of the bottom plate; the protrusion is arranged on the outer side of the bottom plate corresponding to the position of the opening of the bottom plate, and part of the periphery of the protrusion is formed on the opening of the bottom plate first perimeter.

The bottom plate is used to load various components of the backlight module. Wherein, the lamp tube is arranged on the bottom plate main body. The diffuser plate is erected above the lamp tube through the slanted side plate, so that multiple layers of optical films can be carried on the diffuser plate.

The base plate of the present invention is provided with at least one base plate opening, and has a protruding portion disposed on the outside of the base plate corresponding to the position of the base plate opening. Part of the periphery of the protruding portion is only connected to the first periphery of the opening of the bottom plate, so as to keep the opening of the bottom plate unimpeded. At another part of the periphery where the protruding part is not connected with the opening of the bottom plate, the protruding part is separated from the bottom plate by a predetermined distance. Through the bottom plate opening, the backlight module has a heat dissipation channel, which can help to remove the heat generated and accumulated during its operation.

Therefore, the direct-lit backlight module with high heat dissipation effect provided by the present invention can meet the dual trends of liquid crystal display products 1) increasing in size; More lamp tubes can also avoid the known problems of display quality and component service life caused by the poor heat dissipation effect of the known technology, which not only conforms to the trend of industrial development, but also gives the backlight module products or liquid crystal display products higher industrial competitiveness.

Description of drawings

FIG. 1 is a schematic side sectional view of a known backlight module;

Fig. 2 shows a schematic side sectional view of the direct type backlight module of the present invention;

Fig. 3 shows a three-dimensional exploded view of the bottom plate and reflector in Fig. 2;

Fig. 4 shows a three-dimensional exploded view of an embodiment of the backlight module of the present invention;

Fig. 5 shows the bottom plate of another embodiment of the present invention;

Fig. 6 shows the bottom plate of another embodiment of the present invention;

Figure 7A shows the triangular opening of the bottom plate of the present invention;

Figure 7B shows the semicircular opening of the bottom plate of the present invention; and

Fig. 7C shows the polygonal opening of the bottom plate of the present invention.

Explanation of reference numbers:

Backlight module 10, 30 LCD panel 12

Lamp 14, 34 Diffuser 16, 36

Multi-layer optical film 18, 38 Bottom plate 20, 40

Bottom plate main body 201, 401 inclined side plate 203, 403

Floor opening 405 Protrusion 407

Scheduled spacing 409 front frame 42

Side wall 423 Display panel 52

Detailed ways

Please refer to FIG. 2 . FIG. 2 shows a schematic side sectional view of the direct type backlight module of the present invention. The backlight module 30 is disposed directly under a display panel 52 , and includes at least one light tube 34 , a diffusion plate 36 , multiple layers of optical films 38 and a bottom plate 40 .

The lamp tubes 34 are disposed under the diffusion plate 36 , are arranged parallel to each other, and serve as light sources of the backlight module 30 . The diffuser plate 36 can diffuse the light from below to provide the display panel 52 with more evenly dispersed light. Multiple layers of optical films 38 are disposed on the diffusion sheet 36 , which include, for example, a lower diffusion sheet, a lower brightness enhancement sheet, an upper brightness enhancement sheet, and an upper diffusion sheet. The multiple layers of optical films 38 can increase the uniformity and luminance of the light provided to the display panel 52 , and the order of placement and the types of optical films actually included can be adjusted according to the display quality and product requirements.

The base plate 40 is used to load the above components of the backlight module 30 , and includes a base plate main body 401 and at least one inclined side plate 403 . Wherein, the light tube 34 is disposed on the base body 401 , and the inclined side plate 403 extends upward from the side of the base body 401 . The diffusion plate 36 is erected above the lamp tube 34 through the inclined side plate 403 , so that multiple layers of optical films 38 can be carried on the diffusion plate 36 . It is worth mentioning that the lamp tube 34 is the main heat source of the backlight module 30, so it is not directly in contact with the base plate main body 401, but the lamp tube 34 is erected on the base plate 401 by setting a lamp tube frame (not shown in the figure). and diffuser plate 36.

As shown in FIG. 2 , the bottom plate 40 of the present invention is provided with at least one bottom plate opening 405 , and the bottom plate opening 405 has a first perimeter and a second perimeter opposite to the first perimeter. A protruding portion 407 is disposed on the outside of the base plate 40 corresponding to the position of the base plate opening 405 . Part of the periphery of the protruding portion 407 is formed on the first periphery of the bottom plate opening 405 , and the second periphery is not connected with the protruding portion 407 to keep the bottom plate opening 405 unblocked. As shown in the figure, at the second peripheral position, the protruding portion 407 is separated from the bottom plate 40 by a predetermined distance 409 . Through the bottom plate opening 405, the backlight module 30 has a heat dissipation channel, which can help to remove the heat generated and accumulated during its operation. In a preferred embodiment of the present invention, the distance between the first periphery and the second periphery is between 0.01mm and 2.5mm.

In the embodiment of FIG. 2 , the bottom plate opening 405 is opened on the inclined side plate 403 of the bottom plate 40 , and the bottom plate opening 405 can be opened on the two opposite inclined side plates 403 at the same time, which is beneficial to the air in the backlight module 30 Convection with the outside world improves heat removal efficiency.

The protruding part 407 arranged outside the opening 405 of the bottom plate can be used to prevent foreign objects or particles from entering the backlight module 30, so as to prevent the backlight module 30 from being caused by the foreign objects or particles entering the backlight module 30 when the backlight module 30 is operated in the future. In the case of uneven brightness; when the backlight module 30 is matched with the display panel 52 , the possibility of these foreign objects or particles entering to cause dark spots on the display panel 52 can be reduced.

In practice, the bottom plate opening 405 and the protruding portion 407 can be formed by stamping technology, and the bottom plate opening 405 and the protruding portion 407 can be formed simultaneously by one stamping from the inner surface of the bottom plate 40 to the outside. For example, when the bottom plate opening 405 is a rectangular opening, an inline-shaped conical stamping part (not shown in the figure) can be used to form the bottom plate opening 405 and the protruding portion 407 .

In another embodiment of the present invention, the backlight module 30 further includes a reflector 39 disposed between the lamp tube 34 and the base plate 40 , more precisely, the reflector 39 is disposed on the inner surface of the base plate 40 . The reflection sheet 39 is used to reflect the light generated by the lamp tube 34 upwards, so as to increase the utilization rate of the light.

The reflector 39 has at least one reflector opening 395 , at least part of the reflector opening 395 corresponds to at least part of the bottom plate opening 405 , so as to keep the heat dissipation channel of the backlight module 30 unblocked. Preferably, the opening width of the reflector opening 395 is smaller than the opening width of the bottom plate opening 405 . As shown in FIG. 2 , it is not easy for foreign matter or particles outside the backlight module 30 to pass through the predetermined distance 409 between the protruding portion 407 and the bottom plate 40 . Therefore, if the opening width of the reflective sheet opening 395 is made smaller than the opening width of the bottom plate opening 405 , a part of the reflective sheet 39 can be used to further block foreign objects or particles. In practice, the opening length of the reflector opening 395 is about 1.5-20 mm, and the width is about 0.01-2.5 mm. Therefore, in a preferred embodiment, the bottom plate opening 405 can prevent particles larger than 0.1 mm from entering the inside of the bottom plate 40 of the direct type backlight module.

Please refer to FIG. 3 . FIG. 3 shows a three-dimensional exploded view of the base plate and the reflection sheet in FIG. 2 . This figure shows that in an embodiment of the present invention, the oblique side plate 403 of the bottom plate 40 is punched to form the bottom plate opening 405 through the above-mentioned one-shaped conical head stamping part, so that the bottom plate opening 405 is an approximately rectangular opening . The stamped part of the base plate 40 forms a protruding portion 407 outside the base plate opening 405 , and the protruding portion 407 has three sides connected to the base plate 40 . At the other side that is not connected, the protruding portion 407 is separated from the bottom plate 40 by a predetermined distance 409 . The reflector 39 is provided with a plurality of reflector openings 395 corresponding to the bottom plate openings 405 of the bottom plate 40 .

FIG. 4 shows an exploded perspective view of an embodiment of the backlight module of the present invention. A display panel 52 and a front bezel 42 are located above the backlight module 30 . The backlight module 30 includes a bottom plate 40 , a plurality of lamp tubes 34 , a diffusion plate 36 and a plurality of layers of optical films 38 from bottom to top. The functions of these components have been described above, and the reflection sheet 39 has been disposed on the surface of the bottom plate 40 .

The bottom plate 40 can be a metal plate in practice, and it can be seen from FIG. 4 that the two ends of the metal plate are bent or punched to form a slanted side plate 403, and the middle part is the bottom plate. Subject 401. The light tube 34 is disposed on the base plate main body 401 , and the two opposite inclined side plates 403 can be used to erect the diffuser plate 36 above the light tube 34 . In order to prevent foreign matters or particles from intruding into the backlight module 30 from the two sides without the inclined side plate 403 , this embodiment uses the two side walls 423 of the front frame 42 to keep the backlight module 30 in a sealed state after assembly.

Wherein, a plurality of bottom plate openings 405 are opened on two opposite inclined side plates 403 of the bottom plate 40, so that the backlight module 30 has a good heat dissipation effect, and the outer side of the bottom plate openings 405 has a protruding portion 407 to prevent foreign matter from entering the backlight module 30. middle.

Please refer to FIG. 5 , which shows a bottom plate according to another embodiment of the present invention. Compared with the embodiment in FIG. 3 or FIG. 4 which has two opposite slanted side panels 403, in the embodiment of FIG. As shown in the figure, since the inclined side plates 403 are connected to each other, it can be regarded as only one inclined side plate 403 . In addition, a part of the inclined side plate 403 on each side of the bottom plate 40 is provided with a bottom plate opening 405 , and the above-mentioned protruding portion 407 is disposed outside each bottom plate opening 405 . In this way, the present embodiment can increase the number of heat dissipation channels of the backlight module 30 , so that the heat removal efficiency thereof can be further improved.

Please refer to FIG. 6 , which shows a bottom plate according to another embodiment of the present invention. In this embodiment, the bottom plate opening 405 is further opened in the bottom plate main body 401 of the bottom plate 40 based on the consideration of improving the heat removal efficiency of the backlight module 30 . Wherein, each bottom plate opening 405 is also provided with the above-mentioned protruding portion 407 outside.

Please refer to FIG. 7A to FIG. 7C , which show various embodiments of the bottom plate of the present invention. The bottom plate opening 405 provided on the bottom plate 40 can also have other different shapes besides the aforementioned rectangular opening. A triangular bottom plate opening 405 as shown in FIG. 7A , a semicircular bottom plate opening 405 as shown in FIG. 7B , or a polygonal bottom plate opening 405 as shown in FIG. 7C . The bottom plate openings 405 of different shapes can be manufactured by using corresponding stamping parts, and as shown in the figure, there are still protrusions 407 outside the bottom plate openings 405 of different shapes. As mentioned above, the protrusions 407 is stamped and formed for part of the bottom plate 40, which is only connected to a part of the periphery of the bottom plate opening 405 of the bottom plate 40, and at another part of the periphery (as shown in the figure, at least one side) of the bottom plate opening 405, the bottom plate 40 is connected to the protruding The portions 407 are separated by a predetermined distance.

It has been mentioned in the description of the known technology that under the dual trends of 1) increasing size of liquid crystal display products and 2) increasing display brightness requirements, direct-lit backlight modules need to accommodate more lamp tubes. But at this time, the problem of poor heat dissipation results, and the heat dissipation problem also brings about the problems of degraded display quality and reduced service life of components.

The backlight module 30 of the present invention utilizes the bottom plate opening 405 and the reflector opening 395 to allow the air in the backlight module 30 to convect with the outside world, thereby increasing the heat dissipation performance of the backlight module 30 . Therefore the present invention can effectively improve the shortcoming of known technology. Moreover, when opening the base plate opening 405, the problem of foreign matter or particle intrusion is also taken into consideration. The stamping technology makes the base plate opening 405 not directly exposed to the outside, but is covered by the protruding part 407, and can cooperate with the reflection of the small opening width. The sheet opening 395 effectively blocks foreign objects and particles.

Based on the above, the present invention provides a direct-type backlight module with high heat dissipation effect, so that under the dual trend of increasing size of liquid crystal display products and increasing display brightness requirements, the backlight module can be accommodated even More lamp tubes can also avoid the known problems of display quality and component service life caused by the poor heat dissipation effect of the known technology, which not only conforms to the trend of industrial development, but also gives the backlight module products or liquid crystal display products higher industrial competitiveness.

Although the present invention is described above with preferred examples, it is not intended to limit the spirit and entity of the present invention, but only limited to the above examples. Those skilled in the art can easily understand and use other elements or methods to produce the same effect. Therefore, any modifications made without departing from the spirit and scope of the present invention shall be included within the scope of the patent application.

Claims (13)

1. down straight aphototropism mode set comprises:

One base plate, this base plate offer at least one base plate opening, and this base plate opening has one first periphery and one second periphery; This base plate comprises: a base plate main body; At least one oblique side plate extends on the side direction by this base plate main body; And a teat, being arranged at this plate outer side that corresponds to this base plate aperture position, the part periphery of this teat forms this first periphery of this base plate opening;

And at least one fluorescent tube, be arranged on this base plate main body.

2. down straight aphototropism mode set as claimed in claim 1 is characterized in that, this base plate opening is defined the size of this base plate opening by the spacing of this first periphery and this second periphery.

3. down straight aphototropism mode set as claimed in claim 2 is characterized in that, the spacing of this first periphery and this second periphery is between 0.01mm to 2.5mm.

4. down straight aphototropism mode set as claimed in claim 1 is characterized in that, comprises that more a reflector plate is arranged between this fluorescent tube and this base plate.

5. down straight aphototropism mode set as claimed in claim 4 is characterized in that, this reflector plate has at least one reflector plate opening, and is corresponding with this at least one base plate opening to small part to this at least one reflector plate opening of small part.

6. down straight aphototropism mode set as claimed in claim 5 is characterized in that, the A/F of this at least one reflector plate opening is less than this first periphery of this base plate opening and the spacing of this second periphery.

7. down straight aphototropism mode set as claimed in claim 5 is characterized in that, the opening shape of this reflector plate opening is a thin-and-long.

8. down straight aphototropism mode set as claimed in claim 7 is characterized in that, the opening length of this reflector plate opening is between 1.5-20mm, and width is between 0.01-2.5mm.

9. down straight aphototropism mode set as claimed in claim 1 is characterized in that, this base plate opening is opened in this oblique side plate.

10. down straight aphototropism mode set as claimed in claim 1 is characterized in that, this base plate opening is opened in this base plate main body.

11. down straight aphototropism mode set as claimed in claim 1 is characterized in that, this base plate opening is formed in an impact briquetting mode.

12. down straight aphototropism mode set as claimed in claim 5 is characterized in that, the A/F of this at least one reflector plate opening is less than the A/F of corresponding this at least one base plate opening.

13. down straight aphototropism mode set as claimed in claim 1 is characterized in that, this base plate opening can prevent that the particle greater than 0.1mm from entering the base plate inboard of down straight aphototropism mode set.

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