CN201004138Y - Backlight module and support member thereof - Google Patents

Abstract

A back light module and its supporter, the back light module includes a lamp house, at least one light source, a diffusion plate and at least one supporter, the lamp house has an opening, and the opening exposes the bottom of the lamp house, and the light source is disposed in the lamp house, the diffusion plate is disposed at the opening of the lamp house, and the supporter is supported between the bottom of the lamp house and the diffusion plate, the supporter is made of transparent material, and the surface of the supporter is provided with a light diffusion layer, the light diffusion layer is suitable for reflecting part of the light emitted by the light source, part of the light penetrates, and the light reflected by the light diffusion layer and the light penetrating the light diffusion layer can diffuse. The utility model discloses a backlight unit can provide the area source of homogeneity preferred to improve liquid crystal display device's demonstration quality, in addition, the utility model discloses a support piece is great with the area of contact of diffuser plate, so can prevent that the diffuser plate from warping.

Description

Backlight module and its support

【Technical field】

The utility model relates to a surface light source module and its supporting device, in particular to a backlight module and a support used in the backlight module.

【Background technique】

The liquid crystal display is mainly composed of a liquid crystal display panel and a backlight module. The liquid crystal display panel is composed of two transparent substrates and a liquid crystal layer arranged between the two transparent substrates, and the backlight module is used to provide the surface light source required by the liquid crystal display panel so that the liquid crystal display can achieve the display Effect. Generally speaking, backlight modules can be roughly divided into two types: direct-lit and side-lit, and direct-lit backlight modules are usually used in larger-sized liquid crystal display panels.

Please refer to FIG. 1, the conventional backlight module 100 is a direct-type backlight module, which includes a light box 110, a plurality of cold cathode fluorescent lamps (Cold Cathode Fluorescence Lamp, CCFL) 120, a diffuser (Diffuser) 130 and a plurality of support members 140 (only one is shown in FIG. 1 ). Wherein, the CCFL tube 120 is arranged at the bottom of the light box 110, and the diffusion plate 130 is arranged at the opening 112 of the light box 110, so that the light emitted by the CCFL tube 120 forms a surface light source. In addition, the supporting member 140 abuts between the bottom of the light box 110 and the diffuser plate 130 to support the diffuser plate 130 .

In the above-mentioned backlight module 100, the surface of the support member 140 is a smooth surface, and when the outer surface of the support member 140 is provided with a non-transparent reflective material (as shown in FIG. 2A ), the CCFL tube 120 provides Part of the light (such as the light 121 ) is reflected by the support member 140 and enters the diffuser plate 130 . Since the light 121 and the light 122 are incident on the same place of the diffusion plate 130 , a bright spot is formed there. In addition, since no light enters the diffusion plate 130 from the contact point of the diffusion plate 130 and the support member 140 , a dark spot is formed at the contact point of the diffusion plate 130 and the support member 140 . Therefore, the uniformity of the surface light source formed after the light provided by the CCFL tube 120 passes through the diffuser plate 130 is poor.

In addition, when the material of the supporting member 140 is a transparent material (as shown in FIG. 2B ), part of the light (such as the light 123 ) provided by the cold cathode fluorescent lamp 120 will be reflected by the supporting member 140 and incident and diffused. plate 130 , the other part passes through the support member 140 and enters the diffuser plate 130 . Although the light 123 will be divided into two parts when passing to the supporting member 140 , so that the situation of the above-mentioned bright spot is slightly improved, but the situation of the bright spot still exists. Moreover, since no light enters the diffuser plate 130 from the contact point between the diffuser plate 130 and the support member 140 , a dark spot is formed at the contact point between the diffuser plate 130 and the support member 140 . Therefore, the uniformity of the surface light source formed after the light provided by the CCFL tube 120 passes through the diffuser plate 130 is still poor. In addition, since the end of the support member 140 contacting the diffusion plate 130 is pointed, it is easy to protrude the diffusion plate 130 , making the surface of the diffusion plate 130 non-flat, thereby reducing the uniformity of the surface light source.

To sum up, the uniformity of the surface light source provided by the conventional backlight module 100 is not good enough, so that the image displayed on the liquid crystal display has the problem of uneven brightness.

【Content of utility model】

The purpose of the utility model is to provide a backlight module to improve the uniformity of the surface light source provided by the backlight module.

Another object of the present invention is to provide a supporting member, which is suitable for a backlight module, so as to improve the uniformity of the surface light source provided by the backlight module.

Another object of the present invention is to provide a backlight module to prevent deformation of the diffusion plate inside it.

Another object of the present utility model is to provide a supporting member suitable for a backlight module to prevent the diffusion plate of the backlight module from being deformed.

To achieve the above or other purposes, the utility model proposes a backlight module, which includes a light box, at least one light source, a diffusion plate and at least one support member, wherein the light box has an opening, and the opening exposes the light box bottom, and the light source is arranged in the light box, the diffusion plate is arranged at the opening of the light box, and the support is against the bottom of the light box and between the diffusion plate, the material of the support is transparent material, and the surface of the support A light diffusion layer is provided, and the light diffusion layer is suitable for reflecting part of the light emitted by the light source and passing through part of the light, and the light reflected by the light diffusion layer and the light passing through the light diffusion layer will be diffused.

The utility model further proposes a supporting piece, which is suitable for a backlight module, and the backlight module has a light box and a diffusion plate arranged at an opening of the light box, and the supporting piece is suitable for abutting against the bottom of the light box and the bottom of the light box. Between the diffusion plates, the support is made of transparent material, and the surface of the support is provided with a light diffusion layer, and the light diffusion layer is suitable for reflecting part of the light emitted by the light source, and part of the light penetrates and is diffused by the light. The light reflected by the layer and the light transmitted through the light diffusing layer are diffused.

The utility model also proposes a backlight module, which includes a light box, at least one light source, a diffusion plate and at least one support member, wherein the light box has an opening, and the opening exposes the bottom of the light box, and the light source is configured In the light box, the diffuser plate is arranged at the opening of the light box, and the supporting member leans against the bottom of the light box and the diffuser plate. In addition, the supporting member has a top surface in contact with the diffuser plate, and the top surface has a depression .

The utility model further proposes a supporting piece, which is suitable for a backlight module. The backlight module has a light box and a diffusion plate arranged at an opening of the light box, and the supporting piece is suitable for abutting against the bottom of the light box and Between the diffusion plates, the supporting member has a top surface in contact with the diffusion plate, and the top surface has a depression.

Because the light diffusion layer on the surface of the support of the utility model can not only diffuse the light reflected from the support and the light penetrating the support to avoid the generation of bright spots, but also make part of the light from the contact between the support and the diffusion plate The incident diffuser plate, so there will be no dark spots at the contact of the support and the diffuser plate. Therefore, the backlight module of the present invention can provide a surface light source with better uniformity, so as to improve the display quality of the liquid crystal display device. In addition, another supporting member of the present invention has a larger contact area with the diffusion plate, so the deformation of the diffusion plate can be prevented.

【Description of drawings】

FIG. 1 is a schematic cross-sectional view of a conventional backlight module.

FIG. 2A is a schematic diagram of the light path of the light transmitted to the support member made of non-transparent material in the conventional backlight module.

FIG. 2B is a schematic diagram of the light path of the light transmitted to the support member made of transparent material in the conventional backlight module.

FIG. 3 is a schematic cross-sectional view of a backlight module according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of the optical path of the light transmitted to the supporting member in the backlight module according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a backlight module according to a second embodiment of the present invention.

Fig. 6 is a top view of the support in Fig. 5 .

FIG. 7 is a schematic diagram of another backlight module according to the second embodiment of the present invention.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the attached drawings.

【Detailed ways】

first embodiment

FIG. 3 is a schematic cross-sectional view of the backlight module of the first embodiment of the present invention, and FIG. 4 is a schematic view of the optical path of the light transmitted to the support in the backlight module of the first embodiment of the present invention. Referring to FIG. 3 and FIG. 4 , the backlight module 200 of this embodiment includes a light box 210 , at least one light source 220 (a plurality of light sources are shown in FIG. 3 ), a diffusion plate 230 and at least one support member 240 . Wherein, the light box 210 has an opening 212 , and the opening 212 exposes the bottom of the light box 210 , and the light source 220 is disposed in the light box 210 . Specifically, the light source 220 is disposed at the bottom of the light box 210 , for example. The diffuser plate 230 is disposed at the opening 212 of the light box 210 , and the supporting member 240 leans against the bottom of the light box 210 and the diffuser plate 230 to support the diffuser plate 230 . The support member 240 is made of transparent material, and a light diffusion layer 241 is disposed on the surface of the support member 240 . The light diffusing layer 241 is suitable for reflecting part of the light 212 emitted by the light source 210 and passing through part of the light 212 , and the light reflected by the light diffusing layer 241 and the light passing through the light diffusing layer 241 are diffused.

In the above-mentioned backlight module 200, the supporting member 240 may include a first contact portion 242 and a second contact portion 244, wherein the first contact portion 242 is suitable for contacting the bottom of the light box 210, and one end of the second contact portion 244 is connected to The other end of the first contact portion 242 is adapted to be in contact with the diffuser plate 230 . In addition, the second contact portion 244 is tapered from the end connected to the first contact portion 242 to the end contacting the diffusion plate 230 . In this embodiment, the shape of the second contact portion 244 is, for example, conical, but it may also be in other shapes.

Based on the above, the light diffusion layer 241 is, for example, a rough structure formed on the surface of the support member 240 . Specifically, the light diffusion layer 241 is formed by, for example, sanding or etching the surface of the second contact portion 244 to form a rough structure.

Since the light diffusion layer 241 is formed on the surface of the support 240 of this embodiment, when part of the light (such as light 212) emitted by the light source 220 is transmitted to the support 240, a part of the light 212 will be reflected, and the other part will be reflected. The light 212 will pass through the light diffusion layer 241 and enter the inside of the support member 240 . Wherein, since the light diffusion layer 241 diffuses the reflected light 212 before entering the diffusion plate 230 , it is not easy to cause bright spots.

On the other hand, the light 212 passing through the light-diffusing layer 241 is also diffused, and the diffused light can be divided into two parts, one part of the light will pass through the light-diffusing layer 241 again, diffuse again and enter the diffusion plate 230 . Since the light passing through the support member 240 is diffused before entering the diffuser plate 230 , it is not easy to form bright spots. In addition, another part of the light will be reflected inside the support member 240 and enter the diffuser plate 230 from the contact between the support member 240 and the diffuser plate 230, so no dark spots will be generated at the contact position between the support member 240 and the diffuser plate 230 . Therefore, the surface light source provided by the backlight module 200 of this embodiment has better uniformity.

In this embodiment, the light source 220 is, for example, a cold-cathode fluorescent tube, but it can also be other suitable light sources, such as light-emitting diodes. In addition, the material of the supporting member 240 can be transparent acrylic, polycarbonate (polycarbonate, PC), polymethylmethacrylate (polymethylmethacrylate, PMMA) or other suitable materials. In addition, in order to further improve the uniformity of the surface light source provided by the backlight module 200 , a diffusion sheet, a prism sheet or other optical films may be disposed above the diffusion plate 230 .

second embodiment

FIG. 5 is a schematic diagram of a backlight module according to a second embodiment of the present invention, and FIG. 6 is a top view of the supporting member in FIG. 5 . Please refer to FIG. 5 and FIG. 6 , the backlight module 300 of this embodiment includes a light box 310 , at least one light source 320 (a plurality of light sources are shown in FIG. 5 ), a diffusion plate 330 and at least one support member 340 . Wherein, the light box 310 has an opening 312 , and the opening 312 exposes the bottom of the light box 310 , and the light source 320 is disposed in the light box 310 . The diffuser plate 330 is disposed at the opening 312 of the light box 310 , and the supporting member 340 leans against the bottom of the light box 310 and the diffuser plate 330 . In addition, the supporting member 340 has a top surface 342 in contact with the diffuser plate, and the top surface 342 has a recess 344 .

In the above-mentioned backlight module 300 , the supporting member 340 may include a third contact portion 346 and a fourth contact portion 348 . Wherein, the third contact portion 346 is suitable for contacting the bottom of the light box 310 , and the fourth contact portion 348 is disposed on the third contact portion 346 . In addition, the top surface 342 is a surface of the fourth contact portion 348 . In addition, the material of the third contact portion 346 and the fourth contact portion 348 can be a transparent material or an opaque material.

Since the supporting member 340 in this embodiment contacts the diffuser plate 330 with a large area, it can avoid the force applied by the support member 340 to the diffuser plate 330 from being too concentrated to cause the diffuser plate 330 to deform. In this way, the disadvantage that the support member 140 of the conventional backlight module 100 (as shown in FIG. 1 ) tends to protrude the diffusion plate 130 can be improved, so as to improve the uniformity of the surface light source.

It is worth mentioning that, in order to avoid that the light provided by the light source 320 cannot enter the diffuser plate 330 from the part where the support member 340 is in contact with the diffuser plate 330, resulting in the formation of a dark spot at the contact point between the support member 340 and the diffuser plate 330, which affects the performance of the surface light source. For uniformity, the supporting member 340 of this embodiment may further include a point light source 349 disposed in the recess 344 of the supporting member 340 . The point light source 349 can be a light emitting diode, which can provide light to improve the situation of the above-mentioned dark spot, and further improve the uniformity of the surface light source.

FIG. 7 is a schematic diagram of another backlight module according to the second embodiment of the present invention. Please refer to FIG. 7 , the backlight module 300a of this embodiment is similar to the backlight module 300 of FIG. 6 , the difference lies in the supporting member. Specifically, the material of the third contact portion 346 a and the fourth contact portion 348 a of the support member 340 a in this embodiment is a transparent material. In addition, similar to the backlight module 200 of the first embodiment (as shown in FIG. 3 ), the surface of the fourth contact portion 348 a of the support member 340 a is provided with a light diffusion layer 341 . The light diffusing layer 341 is, for example, a rough structure formed on the surface of the fourth contact portion 348a, which is suitable for reflecting part of the light emitted by the light source 310 and passing through part of the light, and the light reflected by the light diffusing layer 341 and the penetrating Light from the light diffusion layer 341 is diffused.

The working principle of the light diffusing layer 341 is similar to that of the light diffusing layer 241 (as shown in FIG. 4 ) described in the first embodiment, and will not be repeated here. In addition, in this embodiment, the point light source 349 of the support member 340a is not an essential component.

In summary, the backlight module and liquid crystal display panel of the present invention have at least the following advantages:

1. Since the surface of the support of the present invention is provided with a light diffusion layer, it can not only diffuse the light reflected from the support and the light penetrating the support to avoid the generation of bright spots, but also make part of the light diffuse on the support The internal reflection of the component and the incident diffusion plate from the contact between the support and the diffusion plate can improve the disadvantage of easy generation of dark spots at the contact between the support and the diffusion plate in the prior art.

2. Due to the large contact area between the support member and the diffuser plate of the present invention, it can avoid the excessive concentration of the force exerted by the support member on the diffuser plate, resulting in deformation of the diffuser plate.

3. The backlight module of the present invention can provide a surface light source with better uniformity, so that the image displayed by the liquid crystal display device has a more uniform brightness.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention.

[Description of main component symbols]

100, 200, 300, 300a: backlight module 241: light diffusion layer

110, 210, 310: light box 242: first contact part

112, 212, 312: opening 244: second contact part

120: cold cathode fluorescent tube 342: top surface

121, 122, 123, 212: light 344: depression

130, 230, 330: diffusion plate 346, 346a: third contact part

140, 240, 340, 340a: support 348, 348a: fourth contact part 349: point light source

220: light source

Claims (16)

1. A backlight module, comprising: a light box with an opening exposing the bottom of the light box; At least one light source is arranged in the light box; a diffuser plate disposed at the opening of the light box; and At least one supporting piece leans against between the bottom of the light box and the diffusion plate, and is characterized in that: the material of the supporting piece is transparent material, and a light diffusing layer is arranged on the surface of the supporting piece. 2. The backlight module according to claim 1, wherein the supporting member comprises: a first contact portion, which is in contact with the bottom of the light box; and A second contact part, one end connected to the first contact part, the other end in contact with the diffuser plate, and the second contact part is tapered from the end connected to the first contact part to the end contacting the diffuser plate, And the light diffusion layer is disposed on the surface of the second contact portion. 3. The backlight module as claimed in claim 2, wherein the shape of the second contact portion is a cone. 4. The backlight module as claimed in claim 1, wherein the support member has a top surface contacting the diffuser plate, and the top surface has a depression. 5. The backlight module according to claim 4, wherein the supporting member comprises: a third contact portion, which is in contact with the bottom of the light box; and A fourth contact part is arranged on the third contact part, and the top surface is a surface of the fourth contact part, and the light diffusion layer is arranged on the surface of the fourth contact part. 6. The backlight module according to claim 4, wherein the supporting member further comprises a point light source disposed in the recess of the supporting member. 7. The backlight module as claimed in claim 6, wherein the point light source comprises a light emitting diode. 8. The backlight module as claimed in claim 1, wherein the light diffusion layer is a rough structure formed on the surface of the supporting member. 9. A support, suitable for a backlight module, the backlight module has a light box and a diffusion plate arranged at an opening of the light box, and the support is against the bottom of the light box and the diffusion plate Between, it is characterized in that: the material of the support is transparent material, and the surface of the support is provided with a light diffusion layer. 10. The support of claim 9, comprising: a first contact portion, which is in contact with the bottom of the light box; and A second contact part, one end connected to the first contact part, the other end in contact with the diffuser plate, and the second contact part is tapered from the end connected to the first contact part to the end contacting the diffuser plate, And the light diffusion layer is disposed on the surface of the second contact portion. 11. The support as claimed in claim 10, wherein the second contact portion is conical in shape. 12. The support as claimed in claim 9, wherein the support has a top surface in contact with the diffuser plate, and the top surface has a depression. 13. The support of claim 12, wherein the support comprises: a third contact portion, which is in contact with the bottom of the light box; and A fourth contact part is arranged on the third contact part, and the top surface is a surface of the fourth contact part, and the light diffusion layer is arranged on the surface of the fourth contact part. 14. The support as claimed in claim 12, wherein the support further comprises a light source disposed in the recess of the support. 15. The support as claimed in claim 14, wherein the point light sources comprise light emitting diodes. 16. The support as claimed in claim 9, wherein the light diffusion layer is a rough structure formed on the surface of the support.

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