CN100334491C - Liquid crystal display and backlight module thereof - Google Patents
Liquid crystal display and backlight module thereof Download PDFInfo
- Publication number
- CN100334491C CN100334491C CNB2004100018868A CN200410001886A CN100334491C CN 100334491 C CN100334491 C CN 100334491C CN B2004100018868 A CNB2004100018868 A CN B2004100018868A CN 200410001886 A CN200410001886 A CN 200410001886A CN 100334491 C CN100334491 C CN 100334491C
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- Prior art keywords
- backlight module
- heat radiation
- base plate
- light sources
- radiation slotted
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 13
- 230000005855 radiation Effects 0.000 claims abstract description 40
- 239000004033 plastic Substances 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 9
- 238000001579 optical reflectometry Methods 0.000 claims description 4
- 238000004020 luminiscence type Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The present invention relates to a liquid crystal display and a backlight module thereof. The backlight module comprises a bottom plate and a plurality of bar-shaped light sources, wherein the bottom plate is provided with a plurality of heat radiation slotted holes; the heat radiation slotted holes go through the bottom plate and are mutually parallel; a plurality of bar-shaped light sources are parallel with the heat radiation slotted holes; heat produced by the light sources are dissipated through the heat radiation slotted holes.
Description
Technical field
The present invention relates to a kind of LCD and backlight module thereof, particularly relate to a kind of directly-down liquid crystal backlight module, it can improve radiating efficiency effectively to reach the requirement of higher briliancy.
Background technology
Liquid crystal display in general LCD uses backlight module that required light source is provided, and with regard to the kind of backlight module, can be divided into ora terminalis formula (edge light type) and straight-down negative (direct light type) two big classes usually.Owing to The present invention be directed to direct type backlight module and improve, below only propose to illustrate that with regard to the formation of direct type backlight module the while is also omitted the explanation of its ora terminalis formula backlight module.
Jap.P. spy as shown in Figure 1 opens in 2001-297623 number, proposes a kind of back lighting device 10, comprises a reflecting plate 11, a light diffusing sheet 12, a plurality of fluorescent tube 13, fluorescent tube support platform 14 and two light-collecting pieces 15; Wherein reflecting plate 11 is positioned at the bottom of backlight module 10, reflect backlight module 10 in order to light, and it is box, and has a base plate 111 and biside plate 112 fluorescent tube 13, side plate 112 lays respectively at the two ends of base plate 111, and vertically extends from base plate 112; Light diffusing sheet 12 is arranged on the reflecting plate 11 in the mode that coats fluorescent tube 13, backlight to form, fluorescent tube 13 is as the light source of backlight module 10, and be arranged at and support on the platform 14, and and 111 of the base plates of reflecting plate 11 have one at interval, light-collecting piece 15 is positioned on the exiting surface of light diffusing sheet 12, to produce the effect that improves briliancy.
Because the required briliancy of backlight module improves constantly, the quantity and the supply capability of fluorescent tube also improve constantly in it, yet, this will make the temperature in the backlight module also improve thereupon, even and caused increasing the quantity and the supply capability of fluorescent tube, but can't increase the situation of briliancy, detailed it, because the temperature in the backlight module is too high, makes its briliancy can reduce along with the increase of running time on the contrary.
In order to improve above-mentioned situation, on reflecting plate 112, form a plurality of openings 23, the mode with the side convection current vertical with fluorescent tube 13 reduces the environment temperature of fluorescent tube 13, and can prevent that the temperature in the backlight module is too high.
Yet, because the position that is arranged at the opening 23 on the reflecting plate 11 is the both sides 112 at reflecting plate 11, opening 23 is far away apart from fluorescent tube 13, what produce can't reduce middle lamp hole temperature effectively to flow path direction, therefore the heat that fluorescent tube produced can't be shed equably, therefore still can not solve heat dissipation problem, cause fluorescent tube can't reach best working temperature, and the briliancy that backlight module is produced reduce.
In addition, existing LCD always has the problem of forward luminance shortage, and the leakage current of fluorescent tube is higher, makes the luminescence efficiency of fluorescent tube can't reach optimization.
Summary of the invention
Because the problems referred to above the object of the present invention is to provide a kind of backlight module, it can increase area of dissipation, improves briliancy effectively.
Another object of the present invention is to provide a kind of LCD with and backlight module, its leakage current that can reduce fluorescent tube is to increase the luminescence efficiency of fluorescent tube.
According to the present invention, a kind of backlight module is provided, it comprises a base plate and a plurality of strip light source, and base plate has a plurality of heat radiation slotted eyes, and the heat radiation slotted eye runs through base plate and parallel to each other.A plurality of strip light sources are parallel with the heat radiation slotted eye, the heat that light source produced loss via the heat radiation slotted eye.
In a preferred embodiment, backlight module also comprises a plurality of reverberators, is arranged between base plate and the strip light source.
In another preferred embodiment, each reverberator has a reflecting curved surface and a support portion, and reflecting curved surface is linked to base plate via the support portion.
In addition, base plate also has at least one perforation, and the support portion is embedded in the perforation.
Backlight module also comprises a light diffusing sheet, and the strip light source is arranged between reflecting curved surface and the diffuser plate,
Have one first both set a distance between light diffusing sheet and the strip light source, the curvature of reflecting curved surface is determined by the distance between the strip light source and first both set a distance.
And each heat radiation slotted eye is all between adjacent reverberator.
In another preferred embodiment, base plate and reverberator are one-body molded.
Reverberator is made by plastics, and the light reflectivity of plastics is more than 95%.
In another preferred embodiment, wherein the strip light source is a fluorescent tube.
Again in the present invention, a kind of LCD is provided, it comprises a housing, a liquid crystal panel and a backlight module, liquid crystal panel is arranged among the housing, backlight module is to be arranged at respect to liquid crystal panel among the housing, backlight module comprises a base plate, a plurality of strip light source and a plurality of reverberator, and base plate has a plurality of heat radiation slotted eyes, and the heat radiation slotted eye runs through base plate and parallel to each other.A plurality of strip light sources are parallel with the heat radiation slotted eye, the heat that light source produced loss via the heat radiation slotted eye.A plurality of reverberators are arranged between base plate and the strip light source.
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 opens the synoptic diagram of the backlight module in 2001-297623 number for the Jap.P. spy;
Fig. 2 is a LCD synoptic diagram of the present invention;
Fig. 3 is the decomposing schematic representation of backlight module of the present invention;
Fig. 4 is the combination synoptic diagram of backlight module of the present invention; And
Fig. 5 is along the backlight module sectional view of AA ' profile line among Fig. 4.
The simple symbol explanation
10 backlight modules
11 reflecting plates
111 base plates
112 side plates
12 light diffusing sheets
13 fluorescent tubes
14 support platform
15 light collecting plates
23 openings
1 LCD
3 housings
4 liquid crystal panels
30 backlight modules
31 base plates
32 heat radiation slotted eyes
33 light diffusing sheets
34 support platform
35 perforation
36 light sources
37 reverberators
371 reflecting curved surfaces
372 support portions
38 reflecting plates
Embodiment
As shown in Figure 2, LCD 1 comprises lower house 3, a liquid crystal panel 4 and bottom-lighting type back light module 30, liquid crystal panel 4 is arranged among the housing 3, backlight module 30 is to be arranged at respect to liquid crystal panel 4 among the housing 3, the present invention mainly is the heat radiation function of improvement backlight module 30 and the briliancy of reflection ray, therefore omits other assembly in the explanation LCD.
Fig. 3 shows the exploded perspective view of backlight module 30 of the present invention, and backlight module 30 comprises a light diffusing sheet 33, a base plate 31, support platform 34, a plurality of strip light source (fluorescent tube) 36 and an a plurality of reverberator 37.
Below just for the structure of light diffusing sheet 33, base plate 31, support platform 34, a plurality of strip light source (fluorescent tube) 36 and a plurality of reverberator 37 and mutual annexation thereof explanation is proposed respectively.
In the present embodiment, the shape of heat radiation slotted eye 32 is longilineal, but is not limited to this, heat radiation slotted eye 32 also can change its shape according to circumstances, therefore, not necessarily strip slotted eye as shown in Figure 3 also can be a plurality of holes that form a line along light source 36 separately.
If after the whole combinations of said modules, as shown in Figure 4, each heat radiation slotted eye 32 is between adjacent reverberator 37.The heat that light source 36 produced can be via heat radiation slotted eye 32 and loss, so just, can in whole backlight module 30, form an open space, can increase thermal convection effectively by this bigger area of dissipation, make the heat of backlight module conduct, so to reach the demand of high brightness.
In addition, in the inboard of base plate 31,32 places can set up a screen pack (filter) in the heat radiation slotted eye, it should be noted, in order to highlight slotted eye 32 of the present invention, do not show screen pack among the figure, so enter among the backlight module 30 via heat radiation slotted eye 32 to prevent and to filter dust or other foreign matter.The setting of screen pack can not influence radiating effect.In addition, the specification of heat radiation slotted eye 32 can change according to the different sizes of foreign matter.
As shown in Figure 5, under the common comparatively not enough situation of the front face brightness of existing LCD, set up the brightness that reverberator 37 of the present invention can increase forward really.Reverberator 37 be arranged at each strip light source 36 under, with the heat radiation slotted eye 32 be arranged in parallel, each reverberator 37 has a reflecting curved surface 371 and a support portion 372.Can know by Fig. 4 and to find out that reflecting curved surface 37 supports via support portion 372, reflecting curved surface 37 mainly be the light that is used for strengthening reflection source 36 to light diffusing sheet 33, except strengthening the front face brightness of display, also can reduce module thickness.In the present invention, except reverberator 37 is set, on base plate 31 medial surfaces, also can increase by a reflection horizon 38 in addition, more improve glorious degrees.
In addition, as shown in the figure, also have at least one perforation 35 in the regional extent of the base plate 31 of the correspondence of each reverberator 37, support portion 372 is embedded in the perforation 35 and is linked on the base plate 31.The present invention does not limit the shape of perforation 35, though be to show long strip type on the figure, can be other shape yet.In another changes example, though show the structure that reverberator 37 can be formed in one with base plate 31 on the figure.
And for example shown in Figure 5, have one first set distance H between light diffusing sheet 33 and the strip light source 36, the curvature of reflecting curved surface is by the distance D between the strip light source and the first set distance H and determine.Under by the simulation of computing machine for different distance H and distance D is the optimal curvatures that can obtain reflecting curved surface.Therefore, the reflecting curved surface of reverberator 37 can increase light source forward utilization factor, in other words, can strengthen the brightness of forward, to reach the performance of uniform briliancy and high briliancy.
It should be noted, reverberator 37 materials of the present invention are different from other reflection horizon, reverberator 37 is made by special plastic material, the light reflectivity of these plastics is more than 95%, because this plastics electrically insulating material, can effectively reduce fluorescent tube 36 leakage currents that the backlight module 30 of metalwork is caused, fluorescent tube 36 luminescence efficiencys are more improved.
As mentioned above, the present invention's formation that can effectively utilize heat radiation slotted eye 32 impels thermal convection by this, can allow fluorescent tube 36 operate under the working temperature of the best, and the briliancy optimization that backlight module 30 is produced.
In sum, can increase area of dissipation, improve the briliancy of LCD effectively by heat radiation slotted eye 32 in the backlight module 30 of the present invention.Another advantage is can reduce the leakage current of fluorescent tube to increase the luminescence efficiency of fluorescent tube by above-mentioned reverberator 37.
Though the present invention discloses as above with preferred embodiment; yet it is not in order to limit the present invention; those skilled in the art can do a little change and retouching without departing from the spirit and scope of the present invention, thus protection scope of the present invention should with accompanying Claim the person of being defined be as the criterion.
Claims (19)
1. backlight module comprises:
One base plate has a plurality of heat radiation slotted eyes, and these heat radiation slotted eyes run through this base plate and parallel to each other;
A plurality of strip light sources, parallel with these heat radiation slotted eyes, the heat that these strip light sources produced loss via these heat radiation slotted eyes; And
A plurality of reverberators are arranged between this base plate and these strip light sources, be positioned at light source under, wherein each the heat radiation slotted eye between adjacent reverberator.
2. backlight module as claimed in claim 1, wherein each reverberator has a reflecting curved surface and a support portion, and this reflecting curved surface is linked to this base plate via this support portion.
3. backlight module as claimed in claim 2, wherein this base plate also has at least one perforation, and this support portion is embedded in this perforation.
4. backlight module as claimed in claim 2, it also comprises a light diffusing sheet, these strip light sources are arranged between this reflecting curved surface and this diffuser plate.
5. backlight module as claimed in claim 4 wherein has one first both set a distance between this light diffusing sheet and these strip light sources, the curvature of this reflecting curved surface is by the distance between these strip light sources and this first both set a distance and determine.
6. backlight module as claimed in claim 1, wherein this base plate and these reverberators are one-body molded.
7. backlight module as claimed in claim 1, wherein these reverberators are made by plastics, and the light reflectivity of these plastics is more than 95%.
8. backlight module as claimed in claim 1, it also comprises a screen pack, is arranged on these heat radiation slotted eyes.
9. backlight module as claimed in claim 1, wherein this strip light source is a fluorescent tube.
10. backlight module as claimed in claim 1, wherein this backlight module is a direct type backlight module.
11. a LCD comprises:
One housing;
One liquid crystal panel is arranged among this housing; And
One backlight module, to be arranged at respect to this liquid crystal panel among this housing, this backlight module comprises:
One base plate has a plurality of heat radiation slotted eyes, and these heat radiation slotted eyes run through this base plate and parallel to each other;
A plurality of strip light sources, parallel with these heat radiation slotted eyes, the heat that these strip light sources produced loss via these heat radiation slotted eyes; And
A plurality of reverberators are arranged between this base plate and these strip light sources, be positioned at light source under, wherein each the heat radiation slotted eye between adjacent reverberator.
12. LCD as claimed in claim 11, wherein each reverberator has a reflecting curved surface and a support portion, and this reflecting curved surface is linked to this base plate via this support portion.
13. LCD as claimed in claim 12, wherein this base plate also has at least one perforation, and this support portion is embedded in this perforation.
14. LCD as claimed in claim 11, it also comprises a light diffusing sheet, and these strip light sources are arranged between this reflecting curved surface and this diffuser plate.
15. LCD as claimed in claim 14 wherein has one first both set a distance between this light diffusing sheet and these strip light sources, the curvature of this reflecting curved surface is by the distance between these strip light sources and this first both set a distance and determine.
16. LCD as claimed in claim 11, wherein this base plate and these reverberators are one-body molded.
17. LCD as claimed in claim 11, wherein these reverberators are made by plastics, and the light reflectivity of these plastics is more than 95%.
18. LCD as claimed in claim 11, wherein this strip light source is a fluorescent tube.
19. LCD as claimed in claim 11, it also comprises a screen pack, is arranged on these heat radiation slotted eyes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100018868A CN100334491C (en) | 2004-01-15 | 2004-01-15 | Liquid crystal display and backlight module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100018868A CN100334491C (en) | 2004-01-15 | 2004-01-15 | Liquid crystal display and backlight module thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558277A CN1558277A (en) | 2004-12-29 |
| CN100334491C true CN100334491C (en) | 2007-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100018868A Expired - Fee Related CN100334491C (en) | 2004-01-15 | 2004-01-15 | Liquid crystal display and backlight module thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100334491C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100353237C (en) * | 2005-01-27 | 2007-12-05 | 友达光电股份有限公司 | Liquid crystal display device and backlight assembly thereof |
| KR20060120373A (en) * | 2005-05-19 | 2006-11-27 | 삼성전자주식회사 | Back light unit and liquid crystal display apparatus employing the same |
| WO2012002321A1 (en) * | 2010-06-30 | 2012-01-05 | パナソニック液晶ディスプレイ株式会社 | Liquid crystal display device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001155527A (en) * | 1999-11-30 | 2001-06-08 | Toshiba Lighting & Technology Corp | Back light device and liquid crystal display device |
| JP2002196326A (en) * | 2000-12-26 | 2002-07-12 | Hitachi Ltd | Liquid crystal display device |
| CN2546911Y (en) * | 2002-04-10 | 2003-04-23 | 廖骏吉 | Negative phototropic cover radiating structure |
| CN1428640A (en) * | 2001-06-15 | 2003-07-09 | 松井弘一 | Back light lighting device |
| CN2593224Y (en) * | 2002-10-18 | 2003-12-17 | 明基电通股份有限公司 | Downward back light apparatus and its frame |
| CN1501135A (en) * | 2002-11-12 | 2004-06-02 | 统宝光电股份有限公司 | Backlight module |
-
2004
- 2004-01-15 CN CNB2004100018868A patent/CN100334491C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001155527A (en) * | 1999-11-30 | 2001-06-08 | Toshiba Lighting & Technology Corp | Back light device and liquid crystal display device |
| JP2002196326A (en) * | 2000-12-26 | 2002-07-12 | Hitachi Ltd | Liquid crystal display device |
| CN1428640A (en) * | 2001-06-15 | 2003-07-09 | 松井弘一 | Back light lighting device |
| CN2546911Y (en) * | 2002-04-10 | 2003-04-23 | 廖骏吉 | Negative phototropic cover radiating structure |
| CN2593224Y (en) * | 2002-10-18 | 2003-12-17 | 明基电通股份有限公司 | Downward back light apparatus and its frame |
| CN1501135A (en) * | 2002-11-12 | 2004-06-02 | 统宝光电股份有限公司 | Backlight module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1558277A (en) | 2004-12-29 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070829 |