CN100345046C - Backlight module - Google Patents

Abstract

A backlight module comprises a reflecting plate, a supporting member, a lamp tube and a diffusion plate, wherein the supporting member is arranged on the reflecting plate, the lamp tube is arranged in the supporting member, and the diffusion plate is arranged on the reflecting plate, and the distance between the diffusion plate and the supporting member is a specified interval, so that when the supporting member expands, the supporting member can be abutted against the diffusion plate.

Description

Backlight module

technical field

The invention relates to a backlight module, in particular to a backlight module which can reliably prevent the deformation of the lamp tube and the diffusion plate.

Background technique

In the liquid crystal display unit of a general liquid crystal display, a backlight module is used as a light source, and the backlight module can be generally divided into two types according to different structures: edge type and direct type. Since the present invention is aimed at direct type backlight The module is improved, and only the composition of the direct-type backlight module will be described below, and the description of the edge-type backlight module will be omitted.

As shown in Figure 1, the direct-lit backlight module 10 includes a reflector 11, a diffuser 12, a plurality of lamp tubes 13 and a plurality of support columns 14; 13 is reflected out of the backlight module 10, and the diffusion plate 12 is arranged on the reflection plate 11 in a manner covering the lamp tube 13 to form a backlight, and the lamp tube 13 is used as the light source of the backlight module 10; the support column 14 is provided with a reflector plate 11 and the diffuser plate 12 to support the diffuser plate 12 and prevent the optical properties of the backlight module 10 from deteriorating after the diffuser plate 12 is warped and deformed.

However, the disadvantage of the above-mentioned backlight module is that when the size of the liquid crystal display is larger, the size of the light tube in the backlight module will be relatively larger, and such a large-size light tube may also be deformed, thereby affecting the entire liquid crystal display. optical properties.

In order to improve the above situation, in Japanese Patent Laid-Open No. 5-119703, a backlight module 20 is proposed. As shown in FIG. The disadvantage is that when the size of the liquid crystal display is larger, the size of the diffusion plate in the backlight module will be relatively larger, and such a large-size diffusion plate may also be deformed, thereby affecting the optical characteristics of the entire liquid crystal display.

In addition, in Japanese Patent Laid-Open No. 2001-210126, another backlight module 30 is proposed. As shown in FIG. A protrusion 341 is formed on 34, which abuts against the diffusion plate 32 to keep the diffusion plate 32 at a predetermined position, thereby suppressing the occurrence of luminance non-uniformity (mura).

However, the above-mentioned backlight module has the following disadvantages:

1. Since the protrusions are directly in contact with the diffusion plate when the retainer is installed, when the temperature inside the backlight module rises due to lighting, the protrusions may thermally expand and push the diffusion plate outward, which will instead cause the diffusion plate to The outer side is warped and deformed, resulting in non-uniformity of luminance.

2. Since the same holder needs to support two lamp tubes at the same time, when the temperature in the backlight module rises due to lighting, the holder may thermally expand and cause relative displacement between the two lamp tubes, which may cause adverse effects on the lamp tubes In addition, the protrusion may also be displaced due to the thermal expansion of the holder, which will also have an adverse effect on the diffuser plate that is in contact with the protrusion.

Contents of the invention

In view of this, the object of the present invention is to provide a backlight module, which can reliably prevent the deformation of the lamp tube and the diffusion plate therein.

According to the present invention, a backlight module is provided, the backlight module includes a reflector, a support, a lamp tube and a diffusion plate, wherein the support is arranged on the reflector, the lamp is arranged in the support, and The diffuser plate is arranged on the reflection plate, and the distance between the support member and the support member is a specified distance, so that when the support member expands, the support member can abut against the diffuser plate.

In a preferred embodiment of the present invention, the supporting member includes a fixing part and a supporting part, wherein the fixing part is fixed on the reflector, and the supporting part is integrally formed with the fixing part, and the distance from the diffuser plate is a specified distance. The spacing of the size, whereby when the support expands, the support part can abut against the diffuser plate.

The fixing part can be arranged on the reflection plate in a sticking manner.

In addition, there is a perforation on the reflector, and the fixing part passes through the perforation and is fixed on the reflector; in addition, the fixation part can have an elastic part, and the elastic part engages with the perforation to fix the support on the reflector .

In addition, the support part can abut against the diffuser plate in a point contact manner, or the contact surface of the support part and the diffuser plate is an arc surface.

In another preferred embodiment, the lamp tube is arranged in the support member at a predetermined distance from the support member, so as to prevent the support member from damaging the lamp tube when the support member expands with heat and contracts with cold.

In another preferred embodiment, the support is made of white or transparent material.

In another preferred embodiment, the supporting member supports the lamp tube in a manner of surrounding the lamp tube.

Description of drawings

FIG. 1 is a schematic diagram of a known backlight module;

FIG. 2 is a schematic diagram of another known backlight module;

FIG. 3 is a schematic diagram of another known backlight module;

Fig. 4a is the front view of the backlight module of the present invention, wherein the supporting platform is not drawn;

Figure 4b is a schematic diagram of the support in Figure 4a;

Figure 4c is a side view of the backlight module of the present invention;

Figure 5a is a schematic diagram of a variant of the support of the present invention; and

Fig. 5b is a schematic diagram of another modification example of the support member of the present invention.

Explanation of symbols of attached parts and components:

10 backlight module

11 reflector

12 diffuser plate

13 tubes

14 support columns

20 backlight module

23 tubes

24 support columns

30 backlight module

32 diffuser plate

33 tubes

34 retainer

341 protrusions

100 backlight modules

110 reflector

111 perforations

120 supports

121 support part

121a curved surface

122 fixed part

122a elastic part

122b extension

130 lamps

140 diffuser plate

150 support desks

g1, g2 gap

100' backlight module

110' Reflector

120 supports

122' fixed part

100" backlight module

120" support

121" contact point

Detailed ways

In order to make the above and other objects, features and advantages of the present invention more comprehensible, a preferred embodiment is given below and described in detail with reference to the accompanying drawings.

Fig. 4a shows the backlight module 100 of the present invention, which includes a reflector 110, a plurality of support members 120, a plurality of lamp tubes 130 and a diffuser 140, wherein the reflector 110 is located at the bottom of the backlight module 100, in order to Light from the lamp tube 130 is reflected out of the backlight module 100 , and a plurality of through holes 111 are formed thereon for the support member 120 to pass through.

Each supporting member 120 is respectively arranged on the reflecting plate 110, and as shown in FIG. is fixed on the reflection plate 110, and each supporting part 121 is integrally formed with the fixing part 122, and the distance from the diffuser plate 140 is a specified distance g1, so that when the supporting part 120 expands due to thermal factors , the support part 121 can be in contact with the diffuser plate 140; specifically, since there is a distance g1 between the support member 120 and the diffuser plate 140 when it is set, the diffuser plate 140 may be slightly deformed downward due to its own weight at this time. The support member 120 abuts (it should be noted that this deformation does not affect the uniformity of luminance), and when the backlight module 100 increases the internal temperature due to lighting, and then the support member 120 expands, the contact with the support member 120 The abutting diffuser plate 140 will not be deformed outward, but can be kept at a fixed position, so that the backlight module 100 will not have uneven luminance.

Moreover, the support member 120 is formed with two elastic portions 122a on the fixing portion 122, which can engage with the perforation 111 after the fixing portion 122 passes through the through hole 111, so as to fix the support member 120 on the reflector 110; in addition, the support member 120 is also formed with two extensions 122b on the fixing part 122, so that the support 120 can be stably placed on the reflector 110; Here, for example, in the backlight module 100' as shown in FIG. 5a, the fixing part 122' is two flat plates, and can be attached to the reflection plate 110' by an adhesive such as double-sided tape.

As shown in Figures 4a and 4b, the contact surface between the support portion 121 of the support member 120 and the diffuser plate 140 is an arc surface 121a, and the overall section of the support portion 121 is a curved surface, so that the support portion 121 can It is more stable when it abuts against the diffuser plate 140; in addition, it should be noted that the formation method of the support part 121 is not limited thereto, for example, in the backlight module 100" shown in Figure 5b, the support part of the support part 120" Except the part of 121 ″ that surrounds the lamp tube 130 is a curved surface, the other part extends upwards in a straight line and abuts against the diffuser plate 140 in a point contact manner.

It should be understood that the supporting member 120 may be preferably made of white or transparent material so as not to hinder the brightness of the backlight module 100; in addition, in the present invention, the supporting member 120 is to support the lamp tube in a manner surrounding the lamp tube 130 130, so that the lamp tube 130 can be better supported.

In addition, as shown in Figure 4c, the support member 120 supports the central part of the lamp tube 130, but it is not limited to this, and its setting position can be changed depending on the length and material of the lamp tube, or the size of the diffuser plate; The arrangement of the component 120 is not limited to a single support 120 supporting a light tube 130 , and can also vary with the size of the light tube 130 , for example, two support components 120 can be used to support a light tube 130 .

Each lamp tube 130 is used as the light source of the backlight module 100, and is respectively arranged in a single support member 120, and the distance between each lamp tube 130 and each support member 120 is a predetermined distance g2, so that when the support member 120 heat During expansion and contraction, the distance g2 can prevent the support member 120 from causing damage to the lamp tube 130

The diffusion plate 140 can uniformly irradiate the light of the backlight module 100 outward, and is disposed on the reflective plate 110 , and forms a distance g1 from each support member 120 .

It should be understood that the backlight module 100 may further include two supporting platforms 150 , as shown in FIG. 4 c , for supporting the ends of the lamp tubes 130 .

As mentioned above, since the supporting piece is set between the diffuser plate and the reflector plate, the warping deformation of the lamp tube and the diffuser plate can be avoided; in addition, there is a small distance between the diffuser plate and the support piece, which can avoid the thermal expansion of the support piece. Due to the effect of cold shrinkage, the diffusion plate is pushed out; in addition, there is a small distance between the lamp tube and the support, which can prevent the support from touching the lamp tube due to the effect of thermal expansion and contraction, thereby causing the lamp tube to break ; Also, in the present invention, a single support is used to support a single lamp, so the lamp can be supported in a more stable manner.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art should be able to make permissible changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the patent claims.

Claims (11)

1. backlight module comprises:

One reflecting plate;

At least one support member, described at least one support member is arranged on this reflecting plate;

At least one fluorescent tube, described at least one fluorescent tube are arranged at respectively in described at least one support member; And

One diffuser plate, this diffuser plate is arranged on this reflecting plate, and and this support member between distance be the spacing of a given size so that when the expansion of this support member, this support member can with this diffuser plate butt.

2. backlight module as claimed in claim 1, each that it is characterized in that described at least one support member comprises:

One fixed part, this fixed part are fixed on this reflecting plate; And

One support portion, this support portion and this fixed part are integrally formed, and and this diffuser plate between the spacing of distance one given size, and when the expansion of this support member, this support portion can with this diffuser plate butt.

3. backlight module as claimed in claim 2 is characterized in that: described at least one fixed part is to be arranged on this reflecting plate in the mode of pasting.

4. backlight module as claimed in claim 2 is characterized in that: have a perforation on this reflecting plate, and this fixed part passes this perforation and be fixed on this reflecting plate.

5. backlight module as claimed in claim 4 is characterized in that: this fixed part has an elastic, and this elastic engages with this perforation, so that described support member is fixed on this reflecting plate.

6. backlight module as claimed in claim 2 is characterized in that: this support portion is with the mode of a contact and this diffuser plate butt.

7. backlight module as claimed in claim 2 is characterized in that: the bearing surface of this support portion and this diffuser plate is to be a cambered surface.

8. backlight module as claimed in claim 1, it is characterized in that: described at least one fluorescent tube be with and corresponding support member between the distance one prescribed distance mode be arranged in this support member, avoiding when this support member expands with heat and contract with cold, this support member causes damage to this fluorescent tube.

9. backlight module as claimed in claim 1 is characterized in that: described at least one support member is made by white or transparent material.

10. backlight module as claimed in claim 1 is characterized in that: described at least one support member is to support this fluorescent tube in the mode around this fluorescent tube.

11. any described backlight module in the claim as the front, it is characterized in that: the quantity of described at least one support member and described at least one fluorescent tube is a plurality of.

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