TW200523623A - Direct type backlight module - Google Patents

Abstract

The present invention provides a direct type backlight module which includes a number of lamp, a diffuser plate, a reflective plate and a heat dissipating device. The diffuser plate is set above the lamp. The reflective plate is set under the lamp, and is used for reflecting the light coming form the lamp to the diffuser. The heat dissipating device includes a base and a number of fins, and the base is contacting with the reflective plate.

Description

200523623 V. Description of the invention (1) [The invention to which the invention belongs is directly under the thermal device [Prior technology] Since liquid crystals are used in notebook computers. Due to the need for liquid crystal to achieve the advantages of low power consumption in small-size LCDs in display backlight modules, such as low power consumption and other factors, the utilization rate is low, and large-sized liquid crystal display backlight modules have obtained a previously announced China Minguang The lamp tube 11 4 of the module 110 series is used to provide a panel 11 2 and a diffuser 11 4 to provide a panel 11 2 and a panel 11 2; ^ The display and the action itself are generally displayable. However, the trend of the southward rise is that the valley indicator is developed with light, thin phones, and has a special feature of side light. The side light type is difficult to meet the requirements of technology. stand up. [Technical Field] Regarding a green light π i a, a direct type backlight module, a + ^ type backlight module. Youxin one has the advantages of loose and small package, widely used: digital: science and technology modern information equipment, so it needs to provide them with two types of backlight module design and direct type design. The backlight module is lightweight, thin, and easy to develop. The large-size LCD display side-light backlight module is weight-conscious, and the light of the edge-light backlight module is also very limited, so it cannot be achieved. Therefore, for direct-lit backlight modules without direct-light technology, please refer to the National Patent No. 564,302 of February 2003. As shown in the first figure, the back: Yu Yi Below the display panel 112, a plurality of parallel-arranged diffuser plates 116, a light-increasing 1 24 arranged on the diffuser plate 116, a reflective plate 118, and an outer frame 120 are provided. The light tube and light source; the diffuser plate 116 is located in the light tube 11 4 and the display j, and is used to diffuse the light source generated by the light tube 11 4 to the display [the reflection plate 11 8 is provided below the light tube 11 4 Used to reflect the 200523623 V. Description of the invention (2) The light generated by the lamp tube 1 1 4 reflects to the diffuser plate 1 1 6. The reflective plate 1 1 8 has a plurality of concave-convex structures 1 3 1 and a plurality of openings 1 3 0 to increase the heat dissipation efficiency of the reflecting plate 1 1 8. The concave-convex structure 1 31 of the reflecting plate 1 1 8 is an inverted V-shaped structure. The outer frame 12 is disposed below the reflective plate 1 1 8 and covers the periphery of the reflective plate 1 1 8. The outer frame 1 2 0 also has a plurality of uneven structures 1 2 1 to increase the heat dissipation area of the backlight module 1 10. The backlight module 1 1 0 increases the heat dissipation efficiency by the concave-convex structure 1 3 1 of the reflecting plate 1 1 8, the concave 1 3 0 of the opening 1 30, and the concave-convex structure 1 2 1 of the outer frame 1 2 0. However, the backlight module 1 1 0 There are the following problems: After the heat generated by the lamp tube 1 1 4 is transferred to the reflective plate 1 1 8, it is then conducted to the outer frame 1 2 0 by natural convection through air. When the internal temperature difference of the backlight module 1 1 0 is not large The natural convection speed of air will not be very fast, and the heat dissipation area that can be increased by the concave-convex structure i 3 1 of the reflecting plate 丨 1 is limited, and there is still a problem of slow heat dissipation in heat dissipation; An opening 1 3 0 is provided on the plate 118, and the light emitted from the lamp tube 11 to the position of the opening 130 will be projected through the opening 1 30 to the outer frame 1 2 0 ', and it is difficult to be reflected by the reflective plate 11 8 to diffuse. Plate 116, resulting in insufficient light utilization. In view of this, it is necessary to provide a direct-type backlight module with faster heat dissipation and higher light utilization. SUMMARY OF THE INVENTION An object of the present invention is to provide a direct type backlight module with fast heat dissipation and high light utilization rate. Corresponding to the above object, the present invention provides a direct type backlight module, which includes a plurality of lamp tubes, a diffusion plate, a reflection plate and a heat sink.

Page 6 200523623 V. Description of the invention (3) The diffuser plate is arranged above the lamp tube, the reflecting plate is arranged below the lamp tube, and has a reflecting surface and a back side for the light generated by the lamp tube to The reflecting surface reflects to the diffuser plate. The heat sink has a base and a plurality of fins disposed on the base. The base is close to the back side of the reflecting plate. Compared with the prior art, since the direct type backlight module of the present invention uses a political heat sink, the base of the heat sink is closely attached to the back side of the reflective plate, and the heat generated by the lamp can be directly transmitted to the plurality of fins through heat conduction. Emitted after the film, the plurality of fins increase the heat dissipation area, so that the internal heat dissipation effect of the direct type moonlight module of the present invention can be improved; meanwhile, since the reflective plate of the direct type backlight module of the present invention has no opening, it can be projected thereon All the light is reflected to the diffuser, so as to make full use of the light source and improve the brightness of the backlight module. 1 [Embodiment] Please refer to the second figure, which is the first embodiment of the direct type backlight module of the present invention. The direct-type backlight module 20 includes a plurality of lamp tubes 24, a diffusion plate 21, a light enhancement sheet 22, a diffusion sheet 23, a reflection plate 25, a heat sink 26, and an outer frame 27. The diffusion plate 21, the light-increasing sheet 22, and the diffusion sheet 23 are sequentially disposed above the lamp tube 24. The reflecting plate 25 is disposed below the lamp tube 24 and has a reflecting surface 251 and a back side 25 2 for reflecting the light generated by the lamp tube 24 from the reflecting surface 251 to the diffusion plate 21. The heat sink 26 has a base 261 and a plurality of heat radiating fins 2 6 2 disposed on the base 2 6 1. The base 2 6 1 is closely attached to the back side 2 5 2 of the reflection plate 25. The outer frame 27 has a bottom plate 271 and a plurality of side plates 2 72 ′. The outer frame 27 is disposed below the heat sink 26 and covers the reflection plate 25 and the heat sink 26.

Page 7 200523623 V. Description of the invention (4) The lamp officer 24 is a cold cathode fluorescent lamp tube. The diffuser plate 2 丨 is provided with a complex scattering structure 2π relative to the lamp tube 24. The scattering structure 2 丨} can be further The light emitted by the diffuser lamp 24 causes the light emitted by the lamp tube 24 to pass through the diffuser plate 21, the light-increasing sheet 22, and the diffuser sheet 23 to be converted into uniform planar light. The base 261 of the heat sink 26 is fixed to the reflecting plate 25 by a screw 263. The height of the screw 26 3 is less than the total thickness of the base 261 and the reflecting plate 25. Therefore, when the screw 2 6 3 fixes the base 2 After 6 1 and the reflection plate 25, the reflection surface 2 5 1 of the reflection plate 25 is not protruded to avoid damage to the reflection surface 2 5 1.

Since the direct type backlight module 20 uses a heat sink 26, the base 261 of the heat sink 26 is closely attached to the back side 2 5 2 of the reflective plate 25, and the heat generated by the lamp tube 24 can be directly conducted through heat conduction. The plurality of heat dissipation fins 2 6 2 are emitted, and the plurality of heat dissipation fins 2 6 2 increase the heat dissipation area, so that the internal heat dissipation effect of the direct type backlight module 20 can be improved; meanwhile, because of the direct type backlight module 20 The reflection plate 25 has no opening, and its reflection surface 251 is a complete surface, which can fully reflect the light projected thereon to the diffusion plate 2 丨, thereby making full use of the light source and improving the brightness of the direct type backlight module 20.

Please refer to the third figure, which is a schematic cross-sectional view of the second embodiment of the direct type backlight module of the present invention. The difference between the direct-type backlight module 30 and the direct-type backlight module 20 of the first embodiment is that the reflecting plate 35 has a plurality of triangular protrusions 351 having a triangular cross-section, and the thickness of the protrusions 351 is larger than the thickness of the other parts of the reflecting plate 35. 'Thus, screws 3 6 3 can be provided at the protrusion 351 to increase the bonding strength between the heat sink 36 and the reflection plate 35 when the thickness of the reflection plate 35 is thin; the bottom plate 371 of the outer frame 37 And the side plate 3 72 have a plurality of openings 373 and 374 respectively, and the plurality of openings 373 and 374 are not on the same plane, because

200523623 V. Description of Invention (5)

The heat of the heat sink 3 direct-lit backlight module 30 can be better dissipated through natural air convection. See Figure 4 for a tea, which is a schematic sectional view of the formula of the present invention. The direct-down type direct-down type backlight module 3 〇 The difference lies in the structure of the plate 45 recessed, wherein the direct-down type is a light module. The third embodiment of the light module 40 is the same as the bottom plate of the outer frame 47 of the second embodiment. Close to the bottom part of the reflector that touches the reflector 4 5

It is the base 4 71 of the thermal film, and the heat radiating fins 4 7 3 of the heat sink are arranged on the base 4 7 1 so that the heat of the direct-type backlight module 4 can directly emit the direct-type backlight. Module 40. In addition, the height 侧 of the side plate 472 of the outer frame 47 is greater than or equal to the height ratio of the reflection plate 45 and the heat dissipation fin 473.

In order to protect the heat dissipation fins 473 from collision and damage, the frame surrounded by the side plates 472 can be protected. ^ In summary, the present invention has indeed met the requirements for invention patents, and a patent application has been filed in accordance with the law. However, the above is only a preferred implementation of the present invention. For those who are familiar with the technology of the t case, equivalent modifications or alterations made in accordance with the spirit of the present invention should be included in the scope of the following patent applications.

Page 9 200523623 Brief description of the drawings The first diagram is a schematic cross-sectional view of a direct-lit backlight module of the prior art. The second figure is a schematic cross-sectional view of the first embodiment of the direct type backlight module of the present invention. The third figure is a schematic cross-sectional view of a second embodiment of a direct type backlight module of the present invention.

I The fourth diagram is a schematic cross-sectional view of a third embodiment of a direct type backlight module of the present invention. [Description of component symbols] Direct type backlight module 20, 30 ~ 40 Diffusion plate 21 Enhancement sheet 22 Diffusion sheet 23 Light tube 24 Reflector plate '25, 35, 45 Reflective surface 251 Back side 252 Heat sink 26 ^ 36 Base 26 471 fins 262 ^ 473 screws 26 3 > 363 frame 27, 37, 47 openings 373 ^ 374 bottom plate 27 371 side plate 272 ^ 372 ^ 472 protrusion 351 scattering structure 211

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Claims (1)

200523623 VI. Scope of patent application 1 · A direct-lit backlight module, including a plurality of lamps' under a diffuser and a reflecting plate, the diffuser is a heat sink. 2. If the lamp is applied for 3. The lamp is applied for 3. Diffusion plate 4. If applying for the diffuser 5. If applying for the exclusive, set 'has to use the plate; and' has a base tight range cold cathode range of interest relative to the range of profit above the profit range step includes a frame reflection Plate and heat sink 6. If the scope of the patent application, the outer frame has a bottom 7 · If the scope of the patent application, the bottom plate and the side plate are divided into 8 · If the scope of the patent application, one step includes a base as the outer frame above the lamp tube; A reflecting surface and a back side, the light generated by the lamp tube is reflected from the reflecting surface to a base, and a plurality of back sides of the reflecting plate continued to be arranged on the base. The direct type backlight module described in item 1, wherein the fluorescent tube is a fluorescent tube. The direct-type back sound module described in the first item, wherein a plurality of scattering structures are provided at a part of the lamp tube. The direct type backlight module described in the first item, wherein one step is provided with a light-increasing sheet and a diffusion sheet. ’The direct-type backlight module described in item 1 includes: the outer frame is disposed below the heat sink and covers the 〇 direct-type backlight module described in item 5, which includes a panel and a plurality of side panels. The direct type backlight module described in item 6, which has a plurality of openings. The direct-type backlight module described in item 1, the entrance plate and the outer frame of a plurality of side plates, the base plate of the heat sink, and the bottom plate are concave toward the reflecting plate < 1 Page 11 200523623 The structure of patent application scope. 9. The direct type backlight module according to item 8 of the scope of patent application, wherein the height of the side plate of the outer frame is greater than or equal to the height of the reflection plate and the height of the heat radiation fins. 10. The direct-type backlight module according to item 1 of the scope of patent application, wherein the base of the heat sink is fixed to the reflective plate by screws. 1 1. The direct type backlight module described in item 1 of the scope of patent application, wherein the reflection mask has a plurality of triangular projections in cross section. _ Page 12