CN1797090A

CN1797090A - Direct type backlight module

Info

Publication number: CN1797090A
Application number: CNA200410081763XA
Authority: CN
Inventors: 杨觐聪; 罗仁南
Original assignee: Lianzhun Industry Co ltd
Current assignee: Lianzhun Industry Co ltd
Priority date: 2004-12-30
Filing date: 2004-12-30
Publication date: 2006-07-05
Anticipated expiration: 2024-12-30
Also published as: CN100371792C

Abstract

A direct type backlight module at least comprises: the box body is provided with a bottom surface and a side wall surface surrounding the periphery of the bottom surface, the upper part of the box body is open and is provided with an accommodating space; the light emitting diodes are arranged in the accommodating space of the box body, and the light emitting surfaces of the light emitting diodes face the bottom surface of the box body; the reflecting layer is arranged between the bottom surface of the box body and the light-emitting diodes, extends to the inner side surface of the side wall of the box body, and forms a conical reflector at the corresponding position of each light-emitting diode on the reflecting layer; a diffusion plate arranged above the box body; at least one prism sheet is attached to the upper part of the diffusion plate. The invention makes the light of the light emitting diode form the reflected light with large area coverage after being reflected by the reflector, and then the reflected light is homogenized by the diffusion plate and the light is collected by the prism sheet, and the excellent and uniform light can be output.

Description

Direct type backlight module

[technical field]

The present invention relates to a kind of direct type backlight module, refer to especially utilize light emitting diode to make the downward back optical mode of light source.

[background technology]

As shown in Figure 1, known direct type backlight module 1 has a box body 11, the inside surface of this box body 11 then is coated with or is covered with a reflecting plate 111, and in box body 11, be provided with a considerable amount of cold cathode fluorescent lamp (CCFL) 12, then be provided with a diffuser plate (diffusing plate) 13 in cold cloudy fluorescent tube 12 tops in addition, these diffuser plate 13 tops then are provided with at least one prismatic lens (prism) 14 again.

As shown in Figure 2, when cold cloudy fluorescent tube 12 through energising and when luminous, the light part that it sends is directly to pass top diffuser plate 13 and advance, and another light then can be penetrated after reflecting plate 111 reflections, advances towards top diffuser plate 13 directions again.Thus, locate directly over being positioned at cold cloudy fluorescent tube 12, because of having obtained the event of more light, promptly can form a clear zone, 12 of two cold utmost point fluorescent tubes are then because of obtaining less light, naturally form the dark space, make the light of output form a bright dark alternate phenomenon eventually, and be unfavorable for the utilization of liquid crystal panel (not drawing) herein.

And, have the dealer to research and develop many different designs for overcoming above-mentioned bad phenomenon; As shown in Figure 3, promptly utilized a plurality of half anti-transmission film A to be arranged at each cold cathode fluorescent lamp 12 top in No. 203556 a case of TaiWan, China patent of invention, it utilizes this half anti-transmission film A to have the function of reflection and transmission, the light portion of cold cathode fluorescent lamp 12 can be reflexed to reflecting plate 111, do reflection by reflecting plate 111 again and towards diffuser plate 13 bright dipping of advancing, part light then utilizes its transmission function in addition in addition, can give that transmission is crossed and towards diffuser plate 13 bright dipping of advancing, and the light that can disperse cold cathode fluorescent lamp 12 directly to send forms uneven situation on diffuser plate 13, bright dark alternate phenomenon when using reduction or eliminating light output.

Again, as shown in Figure 4, No. 588149 a case of TaiWan, China patent of invention, then be in diffuser plate 13 corresponding to the top of each cold cathode fluorescent lamp 12, formed thick B, in diffuser plate 13, added simultaneously light diffusion particle C, further utilize among the shape of this thick B and thick B and can hold relatively large light diffusion particle C, so that the light of cold cathode fluorescent lamp 12 is acted on by it, make the evenly effect of diffusion of this light and reach, bright dark alternate phenomenon during in the hope of reduction or the output of elimination light.

But aforesaid case before each, no matter estimate and its attainable effect how, the light that it utilized then all comes from cold-cathode lamp 12; And cold cathode fluorescent lamp 12 itself is not to belong to an environmental protection material, but the portion's product with certain pollution level, no matter be to all having harmful effect to a certain degree on physical environment or the health, and must be paid attention to, and further overcome.

[summary of the invention]

Purpose of the present invention, be to provide a kind of direct type backlight module, the employing light emitting diode is a light source, makes the light of light emitting diode utilize reflecting body to carry out the reflection of wide-angle, bright dark alternate phenomenon when using reduction or eliminating light output is exported to form a uniformly good light.

A kind of direct type backlight module of the present invention is characterized in that: comprise at least:

One box body, this box body have a bottom surface and are surrounded on the abutment wall face of bottom periphery, and this box body top is open shape, and tool one accommodation space; A plurality of light emitting diodes are arranged in the accommodation space of this box body, the exiting surface of this light emitting diode and towards the bottom surface of box body; One reflection horizon has the efficient function of reflecting of light, and this reflection horizon is arranged between the bottom surface and light emitting diode of aforementioned box body, and extends to the medial surface of the abutment wall of box body, and each light emitting diode corresponding position forms the reflecting body of a taper on this reflection horizon; One diffuser plate, the top that is arranged at aforementioned box body is located; At least one prismatic lens is covered on the top of aforementioned diffuser plate.

The reflecting body of taper is coniform or polygonal taper or inverted coniform, inverted polygonal taper in this reflection horizon.

Another direct type backlight module of the present invention is characterized in that: comprise at least:

One box body, this box body have a bottom surface and are surrounded on the abutment wall of this bottom surface, and this box body top is open shape, and tool one accommodation space, and the medial surface of this bottom surface and abutment wall has the efficient function of reflecting of light, are formed with the reflecting body of a plurality of tapers in addition in this bottom surface; A plurality of light emitting diodes, be arranged in the accommodation space of this box body and the exiting surface of this light emitting diode towards the reflecting body of this box bottom; One diffuser plate, the top that is arranged at aforementioned box body is located; At least one prismatic lens is covered on the top of aforementioned diffuser plate.

The taper reflecting body of this box bottom is coniform or polygonal taper or is inverted coniform, inverted polygonal taper.

[description of drawings]

Fig. 1 is known direct type backlight module synoptic diagram.

Fig. 2 is the application synoptic diagram of Fig. 1.

Fig. 3 is another known direct type backlight module synoptic diagram.

Fig. 4 is again a known direct type backlight module synoptic diagram.

Fig. 5 is a spatial structure decomposing schematic representation of the present invention.

Fig. 6 is the application state synoptic diagram of Fig. 5.

Fig. 7 is another performance synoptic diagram of light of Fig. 5.

Fig. 8 is that the light of Fig. 5 one shows synoptic diagram again.

Fig. 9 is the another embodiment of the present invention synoptic diagram.

Figure 10 is the another embodiment of the present invention synoptic diagram.

Figure 11 is the application state synoptic diagram of Figure 10.

Figure 12 is an embodiment synoptic diagram more of the present invention.

[embodiment]

As shown in Figure 5, a kind of direct type backlight module 2 of the present invention has a box body 21, and this box body 21 has a bottom surface 211, and the abutment wall 212 that is surrounded on bottom surface 211 peripheries, and the top is open shape and tool one accommodation space 213; 213 of the accommodation spaces of box body 21 are equipped with a plurality of light emitting diodes (LED) 22, the exiting surface of these light emitting diodes 22 and to dispose towards the bottom surface of box body 21 211 modes, 211 of the bottom surfaces of light emitting diode 22 and box body 21 then are provided with the reflection horizon 23 that light efficiently can be reflected in addition, abutment wall 212 medial surfaces that expand to box body 21 peripheries are also extended in this reflection horizon 23, and be formed with the reflecting body 231 of taper again in the corresponding position of each light emitting diode 22, and this taper reflecting body can be coniform, or polygonal taper.Again, box body 21 tops are provided with a diffuser plate 24, and are covered on the top of diffuser plate 24 with at least one prismatic lens 25.

As shown in Figure 6, light emitting diode 22 is after switching on and can be luminous, at this moment, the direct light L1 that is launched by light emitting diode 22 can be incident upon the side face of reflecting body 231, convert a reflected light L2 to through reflecting body 231 reflections, though the light firing angle that arbitrary light emitting diode 22 all has a certain angle itself, but when this direct light L1 light is incident upon the side face of reflecting body 231, utilize reflecting body 231 side faces can make this direct light L1 that light enlarges the reflection of angle, and make reflected light L2 enlarge its light covering scope, by preliminary homogenising, can reduce the obvious degree of the direct light bright line that L1 forms of light emitting diode 22 simultaneously.

As shown in Figure 7, because of reflected light L2 contain area on a large scale, and the reflected light L2 that the reflecting body 231 of arbitrary light emitting diode 22 correspondences is become is all contained around other adjacent light emitting diode 22, and is able to the uniform performance of construction light.Moreover, the direct light L1 of light emitting diode 22 obtains the reflection of wide-angle at once because of meeting through reflecting body 231 formed reflected light L2, contain area and enlarge its light, and the light-emitting diodes 22 and the distance of diffuser plate 24 effectively can be reduced, that is the height of the accommodation space 213 of compressible box body 21, and help the slimming of corresponding commodity of the present invention.

As shown in Figure 8, via reflecting body 231 formed reflected light L2 after the diffuser plate 24 of box body 21 tops gives further homogenising, and again through prismatic lens 25 light harvestings, thus exportable one good light source, to provide this light source follow-up application apparatus utilization.

Again, as shown in Figure 9, the reflecting body 231 in reflection horizon 23 can also inverse manner form among the present invention, can be inverted coniform or inverted polygonal taper; When the direct light L1 of light emitting diode 22 is incident upon this inverted reflecting body 231, its formed reflected light L2 is promptly along the periphery of this reflecting body 231 and spread ejaculation, and make the reflecting body 231 formed reflected light L2 of arbitrary light emitting diode 22 correspondences, all contained around other adjacent light emitting diode 22, and also can form a uniform light source, and march to and carry out further homogenizing in the diffuser plate 24, pass through prismatic lens 25 light harvestings again, utilize for this light source subsequent applications device.

In the another embodiment of the present invention, as shown in figure 10, wherein, in this direct type backlight module 3, the bottom surface 311 of box body 31 and the medial surface of abutment wall 312 can directly be formed and be had the efficient function of reflecting of light, and its top is open shape and tool one accommodation space 314; Then be provided with a plurality of light emitting diodes 32 in this accommodation space 314, and the exiting surface of these light emitting diodes 32 is towards the bottom surface 311 of box body 31, corresponding to the reflecting body 315 of locating then to be formed with taper of each light emitting diode 32, and this cone can be coniform or polygonal cone in this bottom surface 311.Again, box body 31 tops are provided with a diffuser plate 33, and are covered on the top of this diffuser plate 33 with at least one prismatic lens 34.

As shown in figure 11, when the direct light L1 of light emitting diode 32 is incident upon the reflecting body 315 of bottom surface 311, because of this reflecting body 315 has been had efficiency light line reflection function, so the direct light L1 of light emitting diode 32 promptly can convert a reflected light L2 to, this reflected light L2 then advances with the direction of a wide-angle, and the reflected light L2 that become of the reflecting body 315 that makes arbitrary light emitting diode 32 correspondences, all contained around other adjacent light emitting diode 32, and advance towards top diffuser plate 33 directions, after the homogenize and prismatic lens 34 light harvestings of diffuser plate 33, and follow-up this light application apparatus of exportable confession utilizes.And the bottom surface 311 by box body 31 directly forms reflecting body 315, then can reduce portion's product part cost usefulness in reflection horizon, and the while more can significantly reduce the two spacing of the bottom surface 311 of box body 31 and diffuser plate 33, the requirement of further reaching the slimming commodity.

Again, as shown in figure 12, wherein, the reflecting body 315 of bottom surface 311 can also inverse manner forms in the box body 31, and can be inverted coniform, or inverted polygonal taper; Also make the direct light L1 of light emitting diode 32, can be inverted reflecting body 315 through this and do reflex action, and export a reflected light L2, and spread along reflecting body 315 peripheries and to advance, and the reflected light L2 that the reflecting body 315 that makes arbitrary light emitting diode 32 correspondences is become can be contained around other adjacent light emitting diode 32, uniform light and constitute.

Claims

1. A direct type backlight module, characterized in that: at least comprising:

A box body, the box body has a bottom surface and side walls surrounding the bottom surface, the top of the box body is open, and has an accommodating space; a plurality of light-emitting diodes are arranged in the accommodating space of the box body, The light-emitting surface of the light-emitting diode faces the bottom surface of the box body; a reflective layer has the function of efficiently reflecting light, and the reflective layer is arranged between the bottom surface of the aforementioned box body and the light-emitting diode, and extends to the side wall of the box body On the inner surface, a cone-shaped reflector is formed on the reflective layer corresponding to each light emitting diode; a diffusion plate is arranged above the aforementioned box body; at least one prism sheet is pasted above the aforementioned diffuser plate.

2. The direct-lit backlight module according to claim 1, wherein the conical reflector in the reflective layer is conical or polygonal.

3. The direct-lit backlight module according to claim 1, wherein the conical reflector in the reflective layer is in the shape of an inverted cone or an inverted polygonal pyramid.

4. A direct type backlight module, characterized in that: at least comprising:

A box body, the box body has a bottom surface and a side wall surrounding the bottom surface, the top of the box body is open, and has an accommodating space, and the bottom surface and the inner surface of the side wall have the function of efficiently reflecting light In addition, a plurality of cone-shaped reflectors are formed on the bottom surface; a plurality of light-emitting diodes are arranged in the accommodating space of the box body and the light-emitting surface of the light-emitting diodes faces the reflector on the bottom surface of the box body; a diffusion plate, It is arranged above the box body; at least one prism sheet is pasted above the diffusion plate.

5 . The direct type backlight module according to claim 4 , wherein the conical reflector on the bottom surface of the box is conical or polygonal. 5 .

6 . The direct type backlight module according to claim 4 , wherein the conical reflector on the bottom surface of the box is in the shape of an inverted cone or an inverted polygonal pyramid.