CN100371792C - Direct Type Backlight Module - Google Patents

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 invention relates to a direct-down backlight module, in particular to a direct-down backlight module using a light-emitting diode as a light source.

【Background technique】

As shown in Figure 1, the known direct-type backlight module has a box body 11, the inner surface of the box body 11 is coated or pasted with a reflector 111, and a considerable number of cold cathodes are arranged in the box body 11 The lamp tube (CCFL) 12 is further provided with a diffusing plate 13 above the cold cathode lamp tube 12, and at least one prism sheet (prism) 14 is provided above the diffusing plate 13.

As shown in Figure 2, when the cold lamp tube 12 is energized to emit light, part of the light emitted by it will go directly through the upper diffuser plate 13, and the other part of the light will be reflected by the reflector 111 and then go toward The upper diffusion plate 13 direction advances. In this way, a bright area will be formed at the place directly above the cold lamp tube 12 due to receiving more light, and a bright area will be formed naturally between the two cold lamp tubes 12 due to receiving less light. It is a dark area, which finally makes the output light form a phenomenon of alternating bright and dark, which is not conducive to the utilization of the liquid crystal panel (not shown here).

In order to overcome the above disadvantages, some people in the industry have developed many different designs; as shown in Figure 3, in the case of Taiwan Invention Patent No. 203556, a plurality of semi-reflective transmissive films A are arranged on the top of each cold cathode lamp tube 12 , it uses the function of reflection and transmission of the semi-reflective transmissive film A, which can reflect the light part of the cold cathode lamp tube 12 to the reflector 111, and then reflect by the reflector 111 to advance and emit light towards the diffuser plate 13, and the other Part of the light can be transmitted through the diffuser plate 13 by using its other transmission function, and can disperse the unevenness of the light emitted directly by the cold cathode lamp tube 12 on the diffuser plate 13, so as to reduce or eliminate the light. The phenomenon of alternating light and dark when outputting.

Again, as shown in Figure 4, the case of China Taiwan Invention Patent No. 588149 is to form a thick part B in the diffusion plate 13 corresponding to the top of each cold cathode lamp tube 12, and add Light-diffusing particles C are further utilized to further utilize the shape of the thick portion B and the fact that a large amount of light-diffusing particles C can be accommodated in the thick portion B, so that the light of the cold cathode lamp tube 12 is affected by it, and the light is uniformly diffused In order to reduce or eliminate the phenomenon of alternating light and dark when the light is output.

However, in the above-mentioned previous proposals, regardless of the effect they can achieve, the light they use all comes from the cold cathode lamp 12; and the cold cathode lamp tube 12 itself is not an environmentally friendly material, but has a certain degree of pollution. The parts have a certain degree of adverse effects on the natural environment or human health, and we must pay attention to them and further overcome them.

【Content of invention】

The purpose of the present invention is to provide a direct-type backlight module, which uses light-emitting diodes as the light source, so that the light of the light-emitting diodes is reflected at a large angle by the reflector, so as to reduce or eliminate the phenomenon of alternating light and dark when the light is output, so as to form a Uniform excellent light output.

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

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 inside of the side wall of the box body A conical reflector is formed on the side of 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.

The conical reflector in the reflective layer is conical, polygonal, inverted, or inverted.

Yet another direct-lit backlight module of the present invention is characterized in that it at least includes:

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 conical 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, and the reflectors It is formed on the bottom surface of the box at the position corresponding to each LED; a diffusion plate is arranged above the box; at least one prism sheet is pasted on the top of the diffusion plate.

The conical reflector on the bottom surface of the box is conical or polygonal, or inverted conical or inverted polygonal.

【Description of drawings】

FIG. 1 is a schematic diagram of a conventional direct-lit backlight module.

FIG. 2 is a schematic diagram of the application of FIG. 1 .

FIG. 3 is a schematic diagram of another conventional direct-lit backlight module.

FIG. 4 is a schematic diagram of another conventional direct-lit backlight module.

Fig. 5 is an exploded schematic view of the three-dimensional structure of the present invention.

FIG. 6 is a schematic diagram of the application state of FIG. 5 .

FIG. 7 is a schematic diagram of another representation of the light in FIG. 5 .

FIG. 8 is another schematic diagram showing the light in FIG. 5 .

Fig. 9 is a schematic diagram of another embodiment of the present invention.

Fig. 10 is a schematic diagram of another embodiment of the present invention.

FIG. 11 is a schematic diagram of the application state of FIG. 10 .

Fig. 12 is a schematic diagram of yet another embodiment of the present invention.

【Detailed ways】

As shown in FIG. 5, a direct type backlight module 2 of the present invention has a box body 21, the box body 21 has a bottom surface 211, and side walls 212 surrounding the bottom surface 211, and the upper part is open and There is an accommodating space 213; the accommodating space 213 of the box body 21 is provided with a plurality of light-emitting diodes (LEDs) 22, and the light-emitting surfaces of the light-emitting diodes 22 are arranged toward the bottom surface 211 of the box body 21, and the light-emitting diodes 22 and the bottom surface 211 of the box body 21 is provided with a reflective layer 23 that can reflect light efficiently. A conical reflector 231 is further formed, and the conical reflector can be conical or polygonal. Moreover, a diffuser plate 24 is disposed above the box body 21 , and at least one prism sheet 25 is pasted on the diffuser plate 24 .

As shown in Figure 6, the light-emitting diode 22 can emit light after being energized. At this time, the direct light L1 emitted by the light-emitting diode 22 will hit the peripheral surface of the reflector 231, and be reflected by the reflector 231 and converted into a reflected light L2. Although any light emitting diode 22 itself has a certain angle of light incidence, when the direct light L1 ray hits the peripheral surface of the reflector 231, the direct light L1 ray can be expanded by using the reflector 231 peripheral surface. The angle of reflection makes the reflected light L2 expand its light coverage and is preliminarily uniformed, which can reduce the conspicuousness of the bright lines formed by the direct light L1 of the light emitting diode 22 .

As shown in FIG. 7 , due to the large-scale coverage of the reflected light L2, the reflected light L2 formed by the reflector 231 corresponding to any light emitting diode 22 can cover the surroundings of other adjacent light emitting diodes 22, And it is possible to construct the performance of uniform distribution of light. Furthermore, the reflected light L2 formed by the direct light L1 of the light emitting diode 22 through the reflector 231 will be immediately reflected at a large angle, thereby expanding the area covered by the light, so that the distance between the light emitting diode 22 and the diffuser plate 24 can be shortened. The effective reduction, that is, the height of the accommodating space 213 of the box body 21 can be compressed, which contributes to the thinning of the corresponding product of the present invention.

As shown in Figure 8, after the reflected light L2 formed by the reflector 231 is further homogenized by the diffusion plate 24 above the box body 21, and then collected by the prism sheet 25, an excellent light source can be output to provide The subsequent application of the light source is utilized.

Also, as shown in Figure 9, the reflector 231 of the reflective layer 23 in the present invention can also be formed in an inverted manner, which can be an inverted conical shape or an inverted polygonal pyramid shape; when the direct light L1 of the light emitting diode 22 hits the inverted When the reflector 231 is used, the reflected light L2 formed by it is diffused and emitted along the periphery of the reflector 231, and the reflected light L2 formed by the reflector 231 corresponding to any light emitting diode 22 can be covered to other phases. A uniformly distributed light source can also be formed around the adjacent light emitting diodes 22 , and goes into the diffuser plate 24 for further homogenization, and then collects the light through the prism sheet 25 for subsequent application of the light source.

In another embodiment of the present invention, as shown in FIG. 10 , in the direct type backlight module 3 , the bottom surface 311 of the box body 31 and the inner surface of the side wall 312 can be directly formed and have the function of efficiently reflecting light. And its top is open shape, and has an accommodating space 314; In this accommodating space 314, then be provided with a plurality of light-emitting diodes 32, and the light emitting surface of these light-emitting diodes 32 faces the bottom surface 311 of box body 31, and in this accommodating space 314 A conical reflector 315 is formed on the bottom surface 311 corresponding to each light emitting diode 32 , and the conical reflector 315 may be conical or polygonal. Moreover, a diffuser plate 33 is disposed above the box body 31 , and at least one prism sheet 34 is pasted on the diffuser plate 33 .

As shown in FIG. 11 , when the direct light L1 of the light emitting diode 32 hits the reflector 315 on the bottom surface 311, because the reflector 315 has a high-efficiency light reflection function, the direct light L1 of the light emitting diode 32 will be converted into a reflected light L2. , the reflected light L2 travels in the direction of a large angle, and makes the reflected light L2 formed by the reflector 315 corresponding to any light-emitting diode 32 cover the surroundings of other adjacent light-emitting diodes 32 and move upward The diffusion plate 33 advances in the direction, and after being homogenized by the diffusion plate 33 and collected by the prism sheet 34, the light can be output for use by the subsequent light application device. The reflector 315 is directly formed by the bottom surface 311 of the box body 31, which can reduce the cost of parts and components of the reflective layer, and at the same time greatly reduce the distance between the bottom surface 311 of the box body 31 and the diffuser plate 33, and further achieve thinner products. Require.

Also, as shown in Figure 12, wherein, the reflector 315 of the bottom surface 311 in the box body 31 can also be formed in an inverted manner, and can be an inverted conical shape, or an inverted polygonal pyramid shape; also make the direct light of the light emitting diode 32 L1 can be reflected by the inverted reflector 315 to output a reflected light L2, and spread along the periphery of the reflector 315, so that the reflected light L2 formed by the reflector 315 corresponding to any LED 32 can cover to the surroundings of other adjacent light-emitting diodes 32 to form uniformly distributed light.

Claims (6)

1. direct type backlight module 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, and the exiting surface of this light emitting diode is 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.

2. direct type backlight module as claimed in claim 1 is characterized in that: the reflecting body of taper is coniform or polygonal taper in this reflection horizon.

3. direct type backlight module as claimed in claim 1 is characterized in that: the reflecting body of taper is inverted coniform or inverted polygonal taper in this reflection horizon.

4. direct type backlight module 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, described reflecting body position corresponding to each light emitting diode on box bottom forms; 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.

5. direct type backlight module as claimed in claim 4 is characterized in that: the taper reflecting body of this box bottom is coniform or polygonal taper.

6. direct type backlight module as claimed in claim 4 is characterized in that: the taper reflecting body of this box bottom is inverted coniform or inverted polygonal taper.

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