WO2004092821A1

WO2004092821A1 - Backlight module

Info

Publication number: WO2004092821A1
Application number: PCT/CN2003/000281
Authority: WO
Inventors: Yi-Chun Ho
Original assignee: Quanta Display Inc.; Quanta Display Japan Inc.
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2004-10-28
Also published as: AU2003231462A1; AU2003231462A8

Abstract

The invention discloses a backlight module (200), consisting mainly of a light guide panel (210), a lamp (220), a bottom frame (260) and an upper frame (270). The light guide panel (210) has a light-exiting surface (216). The lamp (220) is near by the light guide panel (210), which the light of the lamp (220) can incident thereunto and exits from the light exiting surface (216). The bottom frame (260) supports the light guide panel (210) and the lamp (220), and is provided with a plurality of heat radiation holes (262a, 266a) near the lamp (220). The upper frame (270) is positioned on the bottom frame (260), and has a window (276) to expose the light-exiting surface (216) of the light guide panel (210). By these heat radiation holes (262a, 266a), eliminates the heat from the lamp (220) for its long-period use.

Description

Backlight module Technical field

The invention relates to a backlight module (Back Light Module, B / L for short), in particular to a backlight module which can effectively exclude a heat source generated by a lamp tube under long-term use. 2. Description of the Related Art In response to the rapid progress of a multimedia society, most of them have benefited from the rapid progress of semiconductor components or human-machine display devices. As far as displays are concerned, cathode ray tubes (CRTs) have been dominating the display market in recent years due to their excellent display quality and economy. However, for the environment where individuals operate most terminals / display devices on the table, or cut in from the perspective of environmental protection, if the trend of energy saving is predicted, there are still many problems in cathode ray tubes due to space utilization and energy consumption, and The demand for light, thin, short, small, and low power consumption cannot effectively provide a solution. Therefore, liquid crystal displays (LCDs) with superior characteristics such as high picture quality, increased space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market. A liquid crystal display (LCD) is mainly composed of a liquid crystal panel and a backlight module. It is worth noting that, since the liquid crystal injected into the liquid crystal panel does not emit light by itself, it is necessary to light the liquid crystal panel through a surface light source provided by the backlight module, so that the liquid crystal display achieves the display effect. Know the importance of backlight modules in liquid crystal displays. FIG. 1 is a schematic structural diagram of a conventional backlight module. Please refer to FIG. 1, the backlight module 100 includes a light guide panel (LGP) 110, a lamp 120, a reflector 130, and an optical film (Optical fi lm) 140, a lower fixed rubber frame (bottom frame) 150, and an upper fixed rubber frame (upper frame) 160. The light guide plate 110 has a light incident surface 112, a light diffusion surface 114, and a light exit surface 116. The light tube 120 is disposed beside the light incident surface 112 of the light guide plate 110, and the light provided by the light tube 120 can be incident into the light guide plate 110 from the light incident surface 112 of the light guide plate 110 and pass through the light diffusion surface 114 of the light guide plate 110. After being scattered and reflected, the light exits from the light exit surface 116. Therefore, it can be known from the above that the role of the light guide plate 110 is to convert the linear light emitted by the lamp tube 120 into a type of surface light source, so as to ensure that the liquid crystal panel (not shown in the figure) obtains light with uniform brightness.

As shown in FIG. 1, the reflection cover 130 is disposed beside the lamp tube 120 and covers the lamp tube 120 to focus the light emitted by the lamp tube 120 toward the light incident surface 112 of the light guide plate 110. The optical film 140 is disposed on the light exit surface 116 of the light guide plate 110 and is used to improve the brightness display of the backlight module 100.

As shown in FIG. 1, the lower fixing plastic frame 150 is used to carry the light guide plate 110, the lamp tube 120, and the reflection cover 130, and a plurality of bumps 154 are provided on a side wall 152 of the lower fixing plastic frame 150, and the upper fixing plastic frame 160 has a plurality of fastening pieces 162 corresponding to the above-mentioned protrusion 154, and the fastening piece 162 has an opening 164, and the opening 164 is adapted to be fastened to the above-mentioned protrusion 154, so that the upper fixing frame 160 and the lower portion The fixing rubber frames 150 are fixed to each other. In addition, the upper fixed plastic frame 160 has a window 166 for exposing the light exit surface 116 of the light guide plate 110, so that a surface light source emitted from the light outgoing surface 116 can be irradiated to a liquid crystal panel disposed above the upper fixed plastic frame 160 ( Not shown). Therefore, it can be known from the above that the light guide plate 110, the lamp tube 120, and the reflection cover 130 are fixed by the combination of the upper fixed plastic frame 160 and the lower fixed plastic frame 150, so that the backlight module 100 can achieve the purpose of integration.

It is worth noting that, since the upper fixed rubber frame and the lower fixed rubber frame are combined with each other, That is, a closed space is formed, and the heat generated by the lamp tube under a long-term use cannot be instantaneously discharged. As a result, the lamp tube is burned due to high heat, and the service life of the lamp tube is shortened. In addition, the heat generated by the lamp tube is retained between the upper fixed plastic frame and the lower fixed plastic frame, which will also affect the arrangement and configuration of the molecules of the optical film, so that the surface light source emitted by the backlight module is in an unstable state. The fl (fl are) phenomenon causes poor display effect of the liquid crystal display. Summary of the invention

Therefore, the object of the present invention is to provide a backlight module, which can effectively eliminate the heat source generated by the lamp under long-term use, and at the same time avoid the optical film caused by the surface light source of the backlight module from flickering due to the heat source. phenomenon. Based on the above objectives, the present invention provides a backlight module, which is mainly composed of a light guide plate, a light tube, a lower fixed plastic frame and an upper fixed plastic frame. The light guide plate has a light exit surface; the lamp tube is arranged beside the light guide plate, and the light provided by the lamp tube can enter the light guide plate and exit from the light exit surface; the lower fixed plastic frame is suitable for carrying the light guide plate and the lamp. Tube, and the lower fixing plastic frame has a plurality of heat dissipation holes adjacent to the lamp tube; the upper fixing plastic frame is disposed on the lower fixing plastic frame, and the upper fixing plastic frame has a window for exposing the light exit surface of the light guide plate.

Also based on the above object, the present invention proposes another backlight module, which is mainly composed of a light guide plate, a plurality of lamp tubes, a lower fixed plastic frame and an upper fixed plastic frame. The light guide plate has a light exit surface; a plurality of lamps are arranged beside the light guide plate, and the light provided by the lamps can enter the light guide plate and exit from the light exit surface; the lower fixed plastic frame is suitable for carrying the light guide. The light plate and the light tubes, and the lower fixing plastic frame has a plurality of heat dissipation holes adjacent to the light tubes; the upper fixing plastic frame is arranged on the lower fixing plastic frame, and the upper fixing plastic frame has a window for exposing the light guide plate. Light exit surface. According to a preferred embodiment of the present invention, the above-mentioned heat dissipation holes are located on a side wall of the lower fixing rubber frame adjacent to the lamp tube, or are located on the bottom wall of the lower fixing rubber frame adjacent to the lamp tube, or are located at the same time. The fixed plastic frame is adjacent to the side wall and the bottom wall of the lamp tube. In addition, the arrangement direction of the heat dissipation holes is parallel to the axis direction of the lamp tube, and the shape of the heat dissipation holes is, for example, rectangular, circular, or oval.

According to a preferred embodiment of the present invention, if the above-mentioned lamp is a single lamp, the lamp may be, for example, a strip lamp, an L-shaped lamp, or a U-shaped lamp. The light tube is, for example, a strip-shaped light tube, the light guide plate also has a light incident surface and a light diffusion surface, and the strip-shaped light tube is configured corresponding to the light incident surface, and the light tube is, for example, an L-shaped lamp. Tube or U-shaped lamp, the light guide plate also has multiple light incident surfaces and multiple light diffusion surfaces, and the L-shaped lamp or U-shaped lamp is arranged corresponding to these light incident surfaces. According to a preferred embodiment of the present invention, if the above-mentioned lamp is a multi-lamp type, these lamps may be, for example, two to three strip lamps matched with each other or one strip lamp and one L The lamp tubes are matched with each other, and the light guide plate also has a plurality of light incident surfaces and a plurality of light diffusion surfaces, and the lamp tubes are arranged corresponding to the light incident surfaces.

According to a preferred embodiment of the present invention, the side wall of the lower fixing rubber frame further has a plurality of protrusions, and the upper fixing rubber frame further has a plurality of fastening pieces corresponding to the protrusions. Each has an opening, and the opening is adapted to be fastened on the bump, so that the upper fixing rubber frame and the lower fixing rubber frame are fixed to each other. In addition, each convex block also has a guide slope for guiding the fastening piece to move on the convex piece, so that when the fastening piece is fastened, the opening on the fastening piece is easier to be fastened on the convex piece.

According to a preferred embodiment of the present invention, an optical film is further disposed on the light emitting surface of the light guide plate, so as to improve the brightness display of the backlight module. In addition, a reflector is arranged beside the lamp tube, and the reflector covers the lamp tube, and is used to place the lamp tube. The emitted light can be concentrated and irradiated toward the light incident surface of the light guide plate. In addition, a reflection sheet is further arranged at the bottom of the light guide plate to improve the reflection and diffusion effect of the light diffusion surface of the light guide plate, thereby improving the light utilization ratio of the backlight module.

In the present invention, a plurality of heat dissipation holes are arranged adjacent to the lamp tube at the lower fixed rubber frame. Therefore, the heat source generated by the lamp tube under long-term use can be discharged through these heat dissipation holes to extend the service life of the lamp tube, and At the same time, the optical film is prevented from flickering due to the heat source generated by the lamp tube, which causes the surface light source emitted by the backlight module to flicker. BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment is described in detail below with reference to the accompanying drawings, so that the above and other objects, features, and advantages of the present invention can be more clearly understood. FIG. 1 is a schematic diagram showing a structure of a conventional backlight module;

2 is a schematic structural view showing a backlight module according to a preferred embodiment of the present invention; FIG. 3 is a schematic perspective view showing a backlight module according to a preferred embodiment of the present invention; FIG. 4 is a cross-sectional view showing section A according to FIG. 3; 5A-5B are schematic diagrams showing the arrangement of a single lamp and a light incident surface according to a preferred embodiment of the present invention; and

6A to 6C are schematic diagrams showing an arrangement of a multi-lamp tube and a light incident surface according to a preferred embodiment of the present invention. detailed description

FIG. 2 is a schematic structural diagram of a backlight module according to a preferred embodiment of the present invention. Please refer to FIG. 2, the backlight module 200 of this embodiment mainly includes a light guide plate 210, a lamp tube 220, a reflection cover 230, an optical film 240, a reflection sheet 250, and The lower fixed rubber frame 260 and the upper fixed rubber frame 270 are configured. The light guide plate 210 has a light incident surface 212, a light diffusion surface 214, and a light exit surface 216, and the light diffusion surface 214 has a plurality of V-shaped notches or a plurality of pits (not shown in the figure). . The light tube 220 is, for example, a strip-shaped light tube, which is arranged beside the light incident surface 212 of the light guide plate 210, and the light provided by the light tube 220 can be incident on the light guide plate 210 through the light incident surface 212 of the light guide plate 210 and pass through. After being scattered and reflected by the light diffusion surface 214 of the light guide plate 210, the light is emitted from the light exit surface 216. Therefore, it can be seen from the above that the role of the light guide plate 210 is to convert the linear light emitted by the lamp tube 220 into a type of surface light source, so as to ensure that the liquid crystal panel (not shown in the figure) obtains light with uniform brightness.

As shown in FIG. 2, the reflecting cover 230 is disposed beside the lamp tube 220 and covers the lamp tube 220 to focus the light emitted by the lamp tube 220 toward the light incident surface 212 of the light guide plate 210. The optical film 240 is disposed on the light exit surface 216 of the light guide plate 210 to improve the brightness of the backlight module 200. The reflection sheet 250 is disposed on the bottom of the light guide plate 210 to improve the reflection and diffusion effect of the light diffusion surface 214 of the light guide plate 210, thereby improving the light utilization rate of the backlight module 200. The above configuration of the reflection cover 230, the optical film 240, and the reflection sheet 250 makes the surface light source provided by the backlight module 200 more perfect, so as to meet the brightness requirements of the high-resolution liquid crystal display. As shown in FIG. 2, the lower fixing rubber frame 260 is used to carry the light guide maple 210, the lamp tube 220, and the reflection cover 230, and the side wall 262 of the lower fixing rubber frame 260 has a plurality of bumps 264, and the upper fixing rubber The frame 270 has a plurality of fastening pieces 272 corresponding to the above-mentioned protrusion 264, and the fastening piece 272 has an opening 274, and the slit 274 is adapted to be fastened to the above-mentioned protrusion 264, so that the plastic frame 270 is fixed on the upper side. It is fixed with the lower fixing rubber frame 260 to achieve tight fitting. In addition, the convex block 264 has a guiding inclined surface 264a for guiding the engaging piece 272 to move on the guiding inclined surface 264a, so that the engaging piece 272 When buckled, the opening 274 on the buckle piece 272 is easier to buckle on the protrusion 264. In addition, the upper fixed plastic frame 270 has a window 276 for exposing the light emitting surface 216 of the light guide plate 210, so that a surface light source emitted from the light emitting surface 216 can illuminate a liquid crystal panel disposed above the upper fixed plastic frame 270 ( Not shown). Therefore, it can be known from the foregoing that the combination of the upper fixing rubber frame 270 and the lower fixing rubber frame 260 fixes the above-mentioned components such as the light guide plate 210, the lamp tube 220, and the reflection cover 230, so that the backlight module 200 achieves the purpose of integration. . FIG. 3 is a schematic perspective view of a backlight module according to a preferred embodiment of the present invention. FIG. 4 shows a sectional view according to section A of FIG. 3. Please refer to FIG. 3 and FIG. 4 together. A plurality of heat dissipation holes 262a are arranged on the side wall 262 of the lower fixing plastic frame 260 adjacent to the light tube 220, and the bottom fixing plastic frame 260 is adjacent to the bottom wall of the light tube 220. 266 is provided with a plurality of heat dissipation holes 266a, and the arrangement direction of the heat dissipation holes 262a and 266a is parallel to the axis direction of the lamp tube 220, and the shape of the heat dissipation holes 266 can be, for example, rectangular, circular, or oval. By disposing the heat dissipation holes 262a and 266a, the space between the upper fixing rubber frame 270 and the lower fixing rubber frame 260 can communicate with the outside world. In this way, the heat source generated by the lamp tube 220 under long-term use, It can be discharged from these heat dissipation holes 262a and 266a, thereby extending the service life of the lamp tube 220, and at the same time avoiding the optical film 240 from being caused by the heat source generated by the lamp tube 220, causing the surface light source emitted by the backlight module 200 to flicker. Can improve the display quality of LCD monitors.

5A-5B are schematic diagrams showing the arrangement of a single lamp and a light incident surface according to a preferred embodiment of the present invention. The above-mentioned lamp tube 220 in FIGS. 2 to 4 is taken as an example of a strip lamp tube in a single lamp type, but those skilled in the art should be able to infer that the present invention is in a single lamp type, and its lamp tube is also For example, it may be an L-shaped lamp tube 300 or a U-shaped lamp tube 400. Please refer to FIGS. 5A to 5B. Wherein, if the lamp tube is an L-shaped lamp tube 300, two light guide plates 210 are designed. The light incident surface 212 and two light diffusion surfaces (not shown in the figure), and the L-shaped lamp tube 300 is arranged corresponding to the two light incident surfaces 212. If the lamp tube is a U-shaped lamp tube 400, the light guide plate 210 is designed with three light incident surfaces 212 and three light diffusion surfaces (not shown in the figure), and the U-shaped lamp tube 400 corresponds to the three light incidences. Surface 212 is configured.

6A to 6C are schematic diagrams showing an arrangement of a multi-lamp tube and a light incident surface according to a preferred embodiment of the present invention. Please refer to FIGS. 6A to 6C. In addition to the single tube type, the lamp tube in this embodiment may also be a multi-tube type. For example, two or three strip tubes 220 may be matched with each other or A strip-shaped tube 220 and an L-shaped tube 300 are matched with each other. As shown in FIG. 6A, if two strip lamps 220 are matched with each other, the light guide plate 210 is designed with two light incident surfaces 212 and two light diffusion surfaces (not shown in the figure), and the two lamps are The tube 220 is arranged corresponding to these two light incident surfaces 212. As shown in FIG. 6B and FIG. 6C, if three strip lamps 220 are matched with each other or one strip lamp 220 and one L-shaped lamp 300 are matched with each other, the light guide plate 210 is designed with three light incident surfaces 212 And three light diffusion surfaces (not shown in the figure), and these lamps are arranged corresponding to the three light incidence surfaces 212. In addition, it is worth noting that the heat dissipation holes in this embodiment are simultaneously arranged on the side wall and the bottom wall of the lower fixing rubber frame adjacent to the lamp tube, but those skilled in the art should know that the heat dissipation holes of the present invention are configured The method is not limited to this configuration. The heat dissipation holes may be arranged only on the side wall of the lower fixing plastic frame adjacent to the lamp tube, or the heat dissipation holes may be arranged only on the bottom wall of the lower fixing plastic frame adjacent to the lamp tube. The same effect can be achieved.

Generally speaking, no matter whether the lamp tube arranged inside the backlight module of the present invention is a single lamp tube or a multi-lamp tube type, a plurality of heat dissipation holes are arranged on the lower fixing plastic frame adjacent to the side wall or the bottom wall of the lamp tube. Through these heat dissipation holes, the heat source generated by the lamp tube under long-term use is discharged. Industrial applicability

The backlight module of the present invention can effectively eliminate the heat source generated by the lamp tube under long-term use, so the service life of the lamp tube can be increased.

In addition, the backlight module of the present invention can effectively eliminate the heat source generated by the lamp tube under long-term use, so as to avoid the phenomenon that the optical film is flickered by the surface light source of the backlight module due to the heat source, so the liquid crystal display can be improved. display effect.

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 can make some modifications and retouching without departing from the spirit and scope of the present invention. The scope of protection of the invention is defined in the claims.

Claims

Rights request

1. A backlight module comprising-a light guide plate having a light exit surface;

A lamp tube, which is arranged beside the light guide plate, and the light provided by the lamp tube enters the light guide plate and is emitted from the light exit surface;

A lower fixed plastic frame, which is adapted to carry the light guide plate and the lamp tube, and the lower fixed plastic frame has a plurality of heat dissipation holes adjacent to the lamp tube; and

An upper fixed plastic frame is disposed on the lower fixed plastic frame, and the upper fixed plastic frame has a window to expose the light exit surface.

2. The backlight module according to claim 1, wherein an arrangement direction of the heat dissipation holes is parallel to an axis direction of the lamp tube.

3. The backlight module according to claim 1, wherein the heat dissipation hole is located on a side wall of the lower fixing plastic frame adjacent to the lamp tube.

4. The backlight module according to claim 1, wherein the heat dissipation hole is located on a bottom wall of the lower fixing plastic frame adjacent to the lamp tube.

5. The backlight module according to claim 1, wherein the heat dissipation hole is located on a side wall of the lower fixing plastic frame adjacent to the lamp tube and on a bottom wall of the lamp tube.

6. The backlight module according to claim 1, wherein the shape of the heat dissipation hole includes a rectangle, a circle, and an oval.

7. The backlight module according to claim 1, wherein the light guide plate further has a light incident surface and a light diffusion surface, and the light tube is a strip-shaped light tube, and the strip-shaped light tube corresponds to the light tube. Light incident surface configuration.

8. The backlight module according to claim 1, wherein the light guide plate further has a plurality of light incident surfaces and a plurality of light diffusion surfaces, and the lamp tube is an L-shaped lamp tube, and the L-shaped lamp tube Corresponds to the light incident surface configuration.

9. The backlight module according to claim 1, wherein the light guide plate further has a plurality of light incident surfaces and a plurality of light diffusion surfaces, and the lamp tube is a U-shaped lamp tube, and the U-shaped lamp tube Corresponds to the light incident surface configuration.

10. The backlight module according to claim 1, wherein the side wall of the lower fixing rubber frame further has a plurality of protrusions, and the upper fixing rubber frame further has a plurality of fastening pieces corresponding to the protrusions. Each of the fastening pieces has an opening, and the opening is adapted to be fastened to one of the protrusions, so that the upper fixing rubber frame and the lower fixing rubber frame are fixed to each other.

11. The backlight module according to claim 10, wherein each of the protrusions further has a guide slope for guiding the buckling piece to move on the protrusion, so that the opening corresponds to Buckle on the bump.

12. The backlight module according to claim 1, further comprising at least one optical film disposed on the light emitting surface.

13. The backlight module according to claim 1, further comprising a reflective cover, the reflector The shooting cover is arranged beside the lamp tube and covers the lamp tube.

14. The backlight module according to claim 1, further comprising a reflective sheet, the reflective sheet being disposed on a bottom of the light guide plate.

15. —A backlight module, including:

A light guide plate having a light exit surface;

A plurality of lamp tubes, which are arranged beside the light guide plate, and the light provided by the lamp tube can be incident on the light guide plate and be emitted from the light exit surface;

16. The backlight module according to claim 15, wherein an arrangement direction of the heat dissipation holes is parallel to an axis direction of the lamp tube.

17. The backlight module according to claim 15, wherein the heat dissipation hole is located on a side wall of the lower fixing plastic frame adjacent to the lamp tube.

18. The backlight module according to claim 15, wherein the heat dissipation hole is located on a bottom wall of the lower fixing plastic frame adjacent to the lamp tube.

19. The backlight module according to claim 15, wherein the heat dissipation hole is located on a side wall of the lower fixing plastic frame adjacent to the lamp tube and on a bottom wall of the lamp tube.

20. The backlight module according to claim 15, wherein the shape of the heat dissipation hole includes a rectangle, a circle, and an oval.

21. The backlight module according to claim 15, wherein the light guide plate further has a plurality of light incident surfaces and a plurality of light diffusion surfaces, and the light tube includes two to three strip-shaped light tubes, and The strip-shaped tube is arranged corresponding to the light incident surface.

22. The backlight module according to claim 15, wherein the light guide plate further comprises a plurality of light incident surfaces and a plurality of light diffusion surfaces, and the lamp tube includes a strip-shaped lamp tube and an L-shaped lamp tube, And the strip-shaped lamp tube and the L-shaped lamp tube are arranged corresponding to the light incident surface.

23. The backlight module according to claim 15, wherein the side wall of the lower fixed rubber frame further has a plurality of bumps, and the upper fixed rubber frame further has a plurality of buckle pieces corresponding to the bumps. Each of the fastening pieces has an opening, and the opening is adapted to be fastened to one of the protrusions, so that the upper fixing rubber frame and the lower fixing rubber frame are fixed to each other.

24. The backlight module according to claim 15, wherein each of the protrusions further has a guide slope for guiding the fastening piece to move on the protrusions, so that the mouthpiece Correspondingly buckle on the bump.

25. The backlight module according to claim 15, further comprising at least one optical film disposed on the light exit surface.

26. The backlight module according to claim 15, further comprising a reflective cover, the reflector The shooting cover is arranged beside the lamp tube and covers the lamp tube.

27. The backlight module according to claim 15, further comprising a reflective sheet, the reflective sheet being disposed on a bottom of the light guide plate.