CN101604098A

CN101604098A - Reflecting back plate and direct-type backlight module

Info

Publication number: CN101604098A
Application number: CN 200810125433
Authority: CN
Inventors: 冯华德; 黄炳锋; 翁林助
Original assignee: Coretronic Corp
Current assignee: TCL China Star Optoelectronics Technology Co Ltd
Priority date: 2008-06-13
Filing date: 2008-06-13
Publication date: 2009-12-16
Anticipated expiration: 2028-06-13
Also published as: CN101604098B

Abstract

A light reflecting back plate is suitable for a backlight module with a light source group. The reflective back plate comprises a frame and a reflective sheet. The frame is provided with at least one hollowed-out opening. The reflector is assembled in the frame. The reflector plate is provided with a reflecting layer and a heat dissipation layer, wherein the reflecting layer and the heat dissipation layer are made of different materials. The reflecting layer is provided with a reflecting surface and a back surface opposite to the reflecting surface, wherein the reflecting surface defines a concave part for accommodating the light source group, and the heat dissipation layer is arranged on the back surface of the reflecting layer.

Description

Reflective backboard and Staight downward type backlight module

Technical field

The present invention relates to a kind of reflective backboard, and particularly relate to a kind of reflective backboard that is applicable to the Staight downward type backlight module of LCD.

Background technology

In recent years, because LCD is with characteristics such as light, thin, little and power consumption are low, on electron image products such as notebook computer, digital still camera, TV, obtained using widely, and replaced conventional cathode ray tube (CRT, Cathode ray tube) display gradually.

LCD mainly comprises two partly: liquid crystal panel and backlight module.Liquid crystal panel mainly by the rotation and the Polarizer of liquid crystal molecule, changes the throughput of light in zones of different, causes light and shade difference in zones of different, to reach the purpose that image shows.Because liquid crystal itself does not have the characteristics of luminescence, therefore must rely on backlight module light source is provided.Difference according to light source position, backlight module generally can be divided into two kinds of full run-down type and side light types, wherein the Staight downward type backlight module since its light source be arranged at display panels under, so have higher brightness, and be used on the large-sized display devices such as monitor and LCD TV more.

In the use of LCD now, the increasing application is to be suspended from wall on or billboards in the wall hanging mode LCD, so lightweight has its certain market trend, and backlight module is the key component of LCD.The backlight module main member of full run-down type has glue frame, optics matrix, diffuser plate, light sources fixture, light sources, diffuser plate and light source bracing frame, reflector plate, backboard, electric pressure converter, electric pressure converter over cap etc.; and form in the framework at this, backboard has promptly accounted for the over half of whole backlight module general assembly (TW).Therefore, can backboard weight reduction, and can the decision LCD meet described light-weighted trend.

Fig. 1 is the synoptic diagram of the backboard of known a kind of Staight downward type backlight module.With reference to figure 1, known backboard 100 is mainly large stretch of metal material, is generally the single sheet material that steel process, and uses the remaining component of carrying backlight module, and as the primary structure that locks in the backlight module, locatees and dispel the heat.In addition, backboard 100 also must keep expanse of material so that the function of anti-light leak and heat radiation to be provided, but has also therefore caused the LCD can't effective light-weighted main cause.

Summary of the invention

The present invention proposes a kind of reflective backboard, and it is applicable to backlight module, to reduce the weight of backlight module.

The present invention proposes a kind of Staight downward type backlight module, and it has less weight.

One embodiment of the present of invention propose a kind of reflective backboard, and it is applicable to the backlight module with light sources.Reflective backboard comprises framework and reflecting piece.Framework has at least one hollow out opening.Reflecting piece is assembled in the framework.Reflecting piece has reflection horizon and heat dissipating layer, and wherein reflection horizon and heat dissipating layer adhere to unlike material separately.The reflection horizon has reflecting surface and with respect to the back side of described reflecting surface, wherein, reflecting surface defines recess, and recess is in order to holding described light sources, and heat dissipating layer is disposed at the back side in described reflection horizon.

Another embodiment of the present invention proposes a kind of backlight module, and it comprises framework, reflecting piece and light sources.Framework has at least one hollow out opening.Reflecting piece is assembled in the framework.Reflecting piece has reflection horizon and heat dissipating layer, and wherein reflection horizon and heat radiation series of strata adhere to unlike material separately.The reflection horizon has reflecting surface and with respect to the back side of described reflecting surface, wherein reflecting surface defines recess, and heat dissipating layer is disposed at the back side in reflection horizon.Described light sources is contained in the recess of reflecting piece.

Based on above-mentioned, in the above embodiment of the present invention, framework by having the hollow out opening and with the reflection horizon be assembled in the framework after heat dissipating layer engages one another, make reflective backboard can realize light-weighted purpose, and by the shading of heat dissipating layer cremasteric reflex layer, support and the function of dispelling the heat.

For above-mentioned feature and advantage of the present invention can be become apparent, a plurality of embodiment cited below particularly, and conjunction with figs. has been described in detail as follows.

Description of drawings

Fig. 1 is the synoptic diagram of the backboard of known a kind of Staight downward type backlight module.

Fig. 2 is the exploded view of a kind of reflective backboard of one embodiment of the present of invention.

Fig. 3 is the constitutional diagram of the reflective backboard of Fig. 2.

Fig. 4 is the exploded view of the framework of Fig. 2.

Fig. 5 is the synoptic diagram of a kind of framework of another embodiment of the present invention.

Fig. 6 is the synoptic diagram of a kind of Staight downward type backlight module of another embodiment of the present invention.

[main element symbol description]

100: backboard

200: reflective backboard

210: framework

210a: hollow out opening

212: side bar

214: strutbeam

220: reflecting piece

220a: recess

222: the reflection horizon

222a: reflecting surface

222b: the back side

224: heat dissipating layer

310: framework

310a: hollow out opening

316: heat radiator

400: the Staight downward type backlight module

410: reflective backboard

410a: recess

420: light sources

Embodiment

The explanation of following each embodiment is graphic with reference to what add, can be in order to the specific embodiment of implementing in order to illustration the present invention.The direction term that the present invention mentioned, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to the accompanying drawings.Therefore, the direction term of use is used for illustrating, but not is used for limiting the present invention.

Fig. 2 is the exploded view of a kind of reflective backboard of one embodiment of the present of invention, and Fig. 3 is the constitutional diagram of the reflective backboard of Fig. 2.With reference to figure 2 and Fig. 3, in the present embodiment, reflective backboard 200 is applicable to the backlight liquid crystal display module.Reflective backboard 200 comprises framework 210 and reflecting piece 220.Framework 210 has hollow out opening 210a.Reflecting piece 220 is assembled in the framework 210.

Reflecting piece 220 comprises reflection horizon 222 and heat dissipating layer 224.Reflection horizon 222 has reflecting surface 222a and with respect to the back side 222b of reflecting surface 222a, wherein reflecting surface 222a defines recess 220a, in order to hold light sources (as the label 420 of Fig. 6).Heat dissipating layer 224 is positioned at the back side 222b in reflection horizon 222.In addition, heat dissipating layer 224 can all or partly be distributed in the back side 222b in reflection horizon 222 according to demand.

In the present embodiment, heat dissipating layer 224 can be formed on the reflection horizon 222 by modes such as stickup, hot signature, coating, plating, evaporations.On the contrary, reflection horizon 222 also can be formed on the heat dissipating layer 224 by modes such as stickup, hot signature, coating, plating, evaporations.In addition, the material in reflection horizon 222 can be the reflection material, and the material of heat dissipating layer 224 can be metal or other heat radiation materials.

Fig. 4 is the exploded view of the framework of Fig. 2.With reference to figure 4, framework 210 is spliced with a plurality of side bars 212, and spliced framework 210 has hollow out opening 210a, uses the weight saving that makes reflective backboard 200, reduces its part by weight in backlight module, to meet light-weighted purpose.In the present embodiment, these side bars 212 can form by the aluminum light sheet bending, and these wherein adjacent side bars 212 can lock mutually by locking part, or splice in modes such as laser, the mutual welding of electrode.In another not shown embodiment, the material of these side bars 212 also can adopt plastic cement.

With reference to figure 2 and Fig. 4, framework 210 also comprises at least one strutbeam 214 again, and it crosses over hollow out opening 210a, and welds mutually or lock mutually with these side bars 212, in order to the structural strength as increase framework 210.Compare with the employed full wafer steel plate of known technology,, be easier to strutbeam 214 is strengthened the processing of structure, for example be provided with darker rib (when cross-section structure is convex) at strutbeam 214 according to present embodiment.In the present embodiment, strutbeam 214 can also form by the aluminum light sheet bending, and the cross-section structure of strutbeam 214 can be shapes such as convex or worker's type, in order to increase the structural strength of framework 210.In another not shown embodiment, the material of strutbeam 214 also can adopt plastic cement.

In the present embodiment, framework 210 can make strutbeam 214 and side bar 212 by the aluminum thin plate, to replace the employed full wafer steel plate of known technology, except keeping structural strength originally, make on the framework 210 can the load light source group etc. the associated components of backlight module, thereby beyond the primary structure as locking in the backlight module and location, can also lower known backboard, thereby the reflective backboard 200 of lightweight owing to shape or the excessive influence of weight that material causes.

In the present embodiment, the thickness of heat dissipating layer 224 can except meeting light-weighted purpose, mainly be in order to reduce the thermal strain in reflection horizon 222 less than above-mentioned these bending backs to constitute the sheet gauge of side bar 212 and strutbeam 214.Therefore, except coming cremasteric reflex layer 222 shade function by means of heat dissipating layer 224, can also assist the heat radiation in reflection horizon 222 and reduce the thermal strain in reflection horizon 222 by means of heat dissipating layer 224, allow reflection horizon 222 when being heated, still can keep its flatness, thereby make reflection horizon 222 reflection ray equably.

Fig. 5 is the synoptic diagram of a kind of framework of another embodiment of the present invention.With reference to figure 5, in the present embodiment, the material of framework 310 can be plastic cement, with the used steel of replacement known technology, and reaches light-weighted effect.In addition, framework 310 can also be one-body molded, for example plastic rubber ejaculate molding.

In the present embodiment, framework 310 can also comprise at least one heat radiator 316, and it is connected to framework 310, in order to the some of hollow out opening 310a in the closed frame 310.The thermal source that heat radiator 316 produces in the time of can effectively absorbing the backlight module running.In the present embodiment, because in order to fixing and the light sources fixture of light sources voltage is provided is the two side ends of being located at framework 310, so heat radiator 316 preferably is located at the two side ends near framework 310.

Fig. 6 is the synoptic diagram of a kind of Staight downward type backlight module of another embodiment of the present invention.With reference to figure 6, in the present embodiment, Staight downward type backlight module 400 comprises reflective backboard 410 and light sources 420.Reflective backboard 410 is the reflective backboard 200 of Fig. 3, and light sources 420 is located in the recess 410a of reflective backboard 410, to originate as the light that Staight downward type backlight module 400 is provided.Above-mentioned recess 410a is the recess 220a of Fig. 3.In the present embodiment, light sources 420 is a light tube group, for example is cold-cathode tube (CCFL, Cold Cathode Fluorescent Lamp).

In sum, in the above embodiment of the present invention, framework by having the hollow out opening and with the reflection horizon be assembled in the framework after heat dissipating layer engages one another, make reflective backboard be reached light-weighted purpose, and by the shading of heat dissipating layer cremasteric reflex layer, support and the function of dispelling the heat.

In addition, framework can also be one-body molded by plastic cement material except the beams (side bar and strutbeam) that can be a plurality of be shaped by the aluminum light sheet bending splicing is made mutually.In addition, framework also can a plurality of beams that formed by plastic cement (side bar and strutbeam) splices mutually and is made.

Though and the present invention is disclosed by means of above each embodiment, these embodiment soldiers divide and are used to limit the present invention, those skilled in the art can carry out some modification and change under the situation that does not break away from the spirit and scope of the present invention.In addition, any one embodiment of the present invention or claim need not realize whole purpose disclosed in this invention or advantage or characteristics.In addition, summary and title only are to carry out literature search in order to help, and are not to be used to limit scope of the present invention.

Claims

1. A reflective backplane, suitable for a backlight module with a light source group, the reflective backplane comprising:

a frame having at least one hollow opening; and

The reflective sheet is assembled into the frame, the reflective sheet has a reflective layer and a heat dissipation layer, wherein the reflective layer and the heat dissipation layer are of different materials, and the reflective layer has a reflective surface and On the back side of the surface, the reflective surface defines a concave portion for accommodating the light source group, and the heat dissipation layer is disposed on the rear surface of the reflective layer.

2. The reflective backplane according to claim 1, wherein the frame is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than that of the thin plate.

3. The reflective backboard according to claim 1, wherein the frame is formed by splicing a plurality of side beams.

4. The reflective backplane according to claim 3, wherein one of the plurality of side beams is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than the thickness of the thin plate.

5. The reflective backplane according to claim 3, wherein the frame further comprises at least one branch beam spanning the hollow opening, and two ends of which are respectively connected to two of the plurality of side beams.

6. The reflective backboard according to claim 5, wherein the support beam is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than that of the thin plate.

7. The reflective backplane according to claim 1, wherein the material of the frame comprises aluminum.

8. The reflective backboard according to claim 1, wherein the material of the frame comprises plastic.

9. The reflective backplane of claim 1, wherein the frame further comprises a cooling fin closing a portion of the hollow opening.

10. A direct-type backlight module, comprising:

a frame having at least one hollow opening;

The reflective sheet is assembled into the frame, the reflective sheet has a reflective layer and a heat dissipation layer, wherein the reflective layer and the heat dissipation layer are of different materials, and the reflective layer has a reflective surface and a back side of a surface, the reflective surface defines a concave portion, and the heat dissipation layer is disposed on the back side of the reflective layer; and

The light source group is accommodated in the concave portion of the reflective sheet.

11. The direct type backlight module of claim 10, wherein the frame is integrally formed.

12. The direct type backlight module according to claim 10, wherein the frame is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than the thickness of the thin plate.

13. The direct type backlight module according to claim 10, wherein the frame is formed by splicing a plurality of side beams.

14. The direct type backlight module according to claim 13, wherein one of the plurality of side beams is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than the thickness of the thin plate.

15. The direct type backlight module according to claim 13, wherein the frame further comprises at least one branch beam spanning the hollow opening, and two ends of which are respectively connected to two of the plurality of side beams.

16. The direct type backlight module according to claim 15, wherein the support beam is formed by bending a thin plate, and the thickness of the heat dissipation layer is smaller than the thickness of the thin plate.

17. The direct type backlight module as claimed in claim 10, wherein the material of the frame comprises aluminum.

18. The direct type backlight module as claimed in claim 10, wherein the material of the frame comprises plastic.

19. The direct type backlight module as claimed in claim 10, wherein the frame further comprises a cooling fin closing a part of the hollow opening.

20. The direct type backlight module according to claim 10, wherein the light source group is a lamp tube group.