CN201401698Y

CN201401698Y - Backlight module

Info

Publication number: CN201401698Y
Application number: CN2009201368443U
Authority: CN
Inventors: 张家骏; 张庆龙
Original assignee: CPTF Visual Display Fuzhou Ltd; Chunghwa Picture Tubes Ltd
Current assignee: CPTF Visual Display Fuzhou Ltd
Priority date: 2009-02-26
Filing date: 2009-02-26
Publication date: 2010-02-10
Anticipated expiration: 2019-02-26

Abstract

The utility model relates to a backlight module which at least comprises a light conducting plate, a luminous unit and a lampshade, wherein the light conducting plate is composed of an upper surface,a lower surface and at least one lateral face, the luminous unit is arranged on the lateral face of the light conducting plate, the lampshade consists of a first holding portion and a second holding portion, wherein the first holding portion is used for clamping the light conducting plate, and the second holding portion is used for clamping the luminous unit. The device can tightly fix the luminous element in the lampshade, is beneficial for the heat radiation of the luminous element, and can improve the service life of the luminous element.

Description

Module backlight

Technical field

The utility model relates to a kind of module backlight, and is particularly related to a kind of module backlight that utilizes lampshade luminescence unit closely to be fixed in LGP one side.

Technical background

Along with modern video signal development of technology, LCD has been used on the display screens of consumption electronic products such as mobile phone, notebook computer, PC and personal digital assistant in large quantities.Yet, because the display panels of LCD itself does not have luminous function, therefore outside display panels, still need dispose module backlight providing display panels needed light source, and then make display panels reach the effect of demonstration.

Generally speaking, module backlight is to be made of elements such as light source, reflecting plate, LGP, optical diaphragm group and frame set.And the employed light source kind of module backlight includes cold cathode fluorescent tube, hot cathode fluorescent tube, motor light tiles or light-emittingdiode etc., is known the most general user with the cold cathode fluorescent tube wherein.Yet in recent years, light-emittingdiode becomes a member of light source newly developed.Light-emittingdiode possesses characteristics such as high chroma, high briliancy, no mercury and color saturation height.Therefore, use light-emittingdiode, more can give panel of LCD higher surcharge, the more visual enjoyment of high-quality is provided, so light-emittingdiode has the trend that replaces the cold cathode fluorescent tube gradually compared to the cold cathode fluorescent tube as die set light source backlight.

With reference to figure 1, it is to show that known light-emittingdiode is applied to the main element exploded perspective view of the LCD 1 of die set light source backlight.As shown in the figure, LCD 1 comprises a display panels 11 and a module 12 backlight at least.Wherein, module 12 backlight includes the blooming piece 124 of a under casing 121, a reflecting plate 122, a LGP 123, plural number and the light-emittingdiode 125a of plural number.What deserves to be mentioned is that though light-emittingdiode 125a is the light source of low heat energy, a collective plural luminous heat that produces of light-emittingdiode 125a is also considerable.So,, a plurality of light-emittingdiode 125a can be arranged at intervals on the microscler circuit board 125b usually, so as to constituting a linear light sources device 125 with present processing procedure.And above-mentioned linear light sources device 125 is arranged at a sidewall of under casing 121, and its light is led to LGP 123.

Yet, use the LCD of light-emittingdiode as back light, the influence that the life-span (lifetime) that its disadvantage is a light-emittingdiode is vulnerable to high temperature reduces.Therefore how in back light system, reduce the operating temperature of light-emittingdiode, or increase the thermal diffusivity of module, just become important problem.

With reference to figure 2, it is that illustrating known is the LCD schematic cross-section of die set light source backlight with light-emittingdiode.As shown in the figure, LCD 2 has a display panels 21 and a module 22 backlight.Wherein, module 22 backlight includes blooming piece 223, a lampshade 224 of a backboard group (not shown), a reflecting plate 221, a LGP 222, plural number and is arranged at a linear light sources device 225 in the lampshade 224.

224 on lampshade (Lamp cover) is a ㄈ type member, and it has an accommodation space, and two plates are contacted with the upper and lower surface of LGP 222 respectively lampshade is held on a side of LGP 222 about the ㄈ type member.

Linear light sources device 225 comprises a circuit board 2251 and a plurality of light-emittingdiode 2252, and wherein light-emittingdiode 2252 is arranged on the circuit board 2251, and is that (not shown) is set at interval.Wherein, linear light sources device 225 is to be placed in the accommodation space of lampshade 224, and on the lower plate of lampshade.Wherein, circuit board 2251 is parallel to the exiting surface of LGP 222, and the light-emitting area of light-emittingdiode 2252 then is parallel to the light inlet side of LGP 222.

Generally speaking, the fixed form between circuit board 2251 and lampshade 224 has two kinds.With reference to figure 3 and Fig. 4, it is to illustrate known embodiment in the lampshade and the schematic cross-section of another embodiment that the linear light sources device is fixed in.As shown in Figure 3, between circuit board 2251 and lampshade 224, paste, yet the shortcoming of this kind method is the thermal resistance that has been to increase the contact-making surface place with two-sided tape 3 (Double coated tape).

Second kind of fixed form as shown in Figure 4, is an end and the lampshade 224 of pasting circuit board 2251 with the two ends of single face adhesive tape 4 respectively.Yet, this kind mode and circuit board 2251 and lampshade 224 are fitted tightly, and adhesive tape 4 when attaching in circuit board 2251 and lampshade 224 intersections, also can cause the increase of thermal resistance.If thermal resistance increases on heat conducting path, then heat energy also can weaken from the usefulness that light-emittingdiode 2252 conducts to lampshade 22, thereby causes the light-emittingdiode lost of life.

Summary of the invention

The purpose of this utility model provides a kind of module backlight, and this device not only can make light-emitting component closely be fixed in the lampshade, and helps the heat radiation of light-emitting component, thereby improves the service life of light-emitting component.

The technical solution of the utility model is achieved in that and which comprises at least a LGP to have a upper surface, a lower surface and at least one side; One luminescence unit is a side that places this LGP; And a lampshade, have one first clamping part and one second clamping part, wherein this first clamping part is in order to this luminescence unit of clamping, and this second clamping part is in order to this LGP of clamping.

The utility model has the advantages that reasonable in designly, simple structure because its light-emitting component and lampshade contact-making surface are bigger, so light-emitting component closely is fixed in the lampshade, and helps the heat radiation of light-emitting component, the service life that can improve light-emitting component.

For above-mentioned feature and advantage of the present utility model can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphic, describe in detail as after.

Description of drawings

Fig. 1 is the main element exploded perspective view that illustrates the known LCD that light-emittingdiode is applied to module backlight;

Fig. 2 is that illustrating known is the LCD schematic cross-section of die set light source backlight with light-emittingdiode;

Fig. 3 be illustrate known the linear light sources device is fixed in a embodiment in the lampshade schematic cross-section;

Fig. 4 illustrates the known schematic cross-section that the linear light sources device is fixed in another embodiment in the lampshade;

Fig. 5 is the module schematic diagram backlight that illustrates the utility model one embodiment.

[primary clustering symbol description]

1,2 LCDs

11 display panels

12 modules backlight

121 under casings

122 reflecting plates

123 LGPs

124 blooming pieces

125 linear light sources devices

The 125a light-emittingdiode

The 125b circuit board

21 display panels

22 modules backlight

221 reflecting plates

222 LGPs

223 blooming pieces

224 lampshades

225 luminescence units

2251 circuit boards

2252 light sources

3 two-sided tapes

4 single face adhesive tapes

52 modules backlight

521 reflecting plates

522 LGPs

The 522a upper surface

The 522b lower surface

The 522c side

523 blooming pieces

524 lampshades

5241 sidewalls

5,242 first plates

5242a first plane

5242b second plane

5,243 second plates

524a first clamping part

524b second clamping part

525 luminescence units

5251 circuit versions

5252 light sources

The specific embodiment

Below, in conjunction with the accompanying drawings specific embodiment of the utility model is further elaborated.

With reference to figure 5, it is the module schematic diagram backlight that illustrates the utility model one embodiment.As shown in the figure, this module 52 backlight comprises blooming piece 523, a lampshade 524 of a backboard group (not shown), a reflecting plate 521, a LGP 522, plural number at least and is arranged at a luminescence unit 525 in the lampshade 524.

Wherein, LGP 522 has a upper surface 522a, a lower surface 522b and at least one side 522c.

Luminescence unit 525 is the side 522c that place LGP 522.And luminescence unit 525 has a circuit board 5251 and a plurality of light source 5252, and those light sources 5252 are the one sides that are arranged at circuit board 5251, and is linear array setting (not shown), and with its electric connection.In a preferred embodiment, light source 5252 is to be a light-emittingdiode (Light emittingdiode), and is that (Surface mount technology SMT) is fixed on the circuit board 5251 through surface mount technology.

And lampshade 524 has one first clamping part 524a and one second clamping part 524b, and wherein the first clamping part 524a is in order to clamping luminescence unit 525, and the second clamping part 524b is in order to clamping light guide board 522.In a preferred embodiment, lampshade has one first plate 5242 and one second plate 5243 of a sidewall 5241 and two ends binding up and down thereof, and the bearing of trend of two

plates

5242,5243 is identical to form an accommodation space.

Above-mentioned luminescence unit 525 is to place in the accommodation space of lampshade 524.Wherein, circuit board 5251 is second plate, 5243 bindings with its another side and 524 lampshades.Light source 5252 has a light-emitting area and is perpendicular to circuit board 5251, and is right against the side 522c of LGP 522.

Continuation illustrates the structure of lampshade 524 further with reference to figure 5: wherein,

First plate 5242 includes the one first plane 5242a and the second plane 5242b, and this second plane 5242b is recessed into and is produced by the accommodation space of this first plate 5242 towards lampshade 524, and has an inclined-plane between two

plane

5242a, 5242b.

What pay special attention to is, the first clamping part 524a is made of the second plane 5242b of first plate 5242 of lampshade 524 and second plate 5243, and the second plane 5242b contacts with those light sources with by the first clamping part 524a clamping luminescence unit 525.In preferred embodiment, lampshade 524 is to use a metal material, can increase the radiating effect of luminescence unit 525.

As for, the second clamping part 524b is made of the first plane 5242a of first plate 5242 of lampshade 524 and second plate 5243, and the first plane 5242a contacts with the upper surface 522a of LGP 522 with by the second clamping part 524b clamping light guide board 522.

Further propose, as shown in the figure, the length of first plate of lampshade is the length less than second plate.As described above, module 52 backlight of the present utility model still comprises reflecting plate 521, is arranged at the lower surface 522b of LGP 522, and the circuit board 5251 of the reflector plate 521 of part and luminescence unit 525 is adjacency and places on second plate 5243 of lampshade 524.

In sum, of the present utility modelly can more effectively luminescence unit 525 be fixed in the side 522c of LGP 522 except the first clamping part 524a and the second clamping part 524b that utilizes lampshade 524, more can be contacted with the radiating effect that luminescence unit 525 increases luminescence units 525 by the second plane 5242b on first plate 5242 of lampshade 524.

Though the utility model discloses as above with preferred embodiment; so it is not of the present utility model in order to limit; have in the technical field under any and know the knowledgeable usually; in not breaking away from spirit and scope of the present utility model; when can doing a little change and retouching, therefore protection domain of the present utility model is as the criterion as the claim person of defining that look claims.

Claims

1. module backlight is characterized in that comprising at least:

One LGP has a upper surface, a lower surface and at least one side;

One luminescence unit is a side that places this LGP; And

One lampshade has one first clamping part and one second clamping part, and wherein this first clamping part is in order to this luminescence unit of clamping, and this second clamping part is in order to this LGP of clamping.

2. module backlight according to claim 1, it is characterized in that: described lampshade has one first plate and one second plate of a sidewall and two ends binding up and down thereof, and the bearing of trend of this two plate is identical to form an accommodation space, and wherein this luminescence unit is to place in this accommodation space of this lampshade.

3. module backlight according to claim 2, it is characterized in that: described first plate includes one first plane and one second plane, this second plane is to be recessed into and to be produced by this first plate this accommodation space towards this lampshade, and this two interplanar has an inclined-plane.

4. module backlight according to claim 3 is characterized in that: described luminescence unit has a circuit board and a plurality of light source, those light sources be with linear array be arranged at this circuit board one side and with its electric connection.

5. module backlight according to claim 4 is characterized in that: described first clamping part is made of this second plane of this lampshade and this second plate, and this second plane is to contact with those light sources to make this this luminescence unit of first clamping part clamping.

6. module backlight according to claim 3, it is characterized in that: described second clamping part is made of this first plane of this lampshade and this second plate, and this first plane is to contact with this upper surface of this LGP to make this this LGP of second clamping part clamping.

7. module backlight according to claim 4 is characterized in that: described circuit board is this second plate binding with its another side and this lampshade.

8. module backlight according to claim 4 is characterized in that: described light source has a light-emitting area and is perpendicular to this circuit board, and is right against this side of this LGP, and this light source is a light-emittingdiode.

9. module backlight according to claim 2 is characterized in that: also comprise a reflector plate, be arranged between this lower surface of this second plate of this lampshade and this LGP.

10. module backlight according to claim 1 is characterized in that: the material of described lampshade is a metal material.