CN100449375C - Liquid crystal display and its back light module - Google Patents
Liquid crystal display and its back light module Download PDFInfo
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- CN100449375C CN100449375C CNB2004100682420A CN200410068242A CN100449375C CN 100449375 C CN100449375 C CN 100449375C CN B2004100682420 A CNB2004100682420 A CN B2004100682420A CN 200410068242 A CN200410068242 A CN 200410068242A CN 100449375 C CN100449375 C CN 100449375C
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- backlight module
- light source
- base plate
- umbilicate type
- reflecting plate
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Abstract
The present invention relates to a liquid crystal display and a back light module thereof. The back light module comprises a light source, a reflection plate and a bottom plate, wherein the reflection plate is arranged under the light source; the bottom plate is arranged above the reflection plate; a plurality of concave structures are arranged on the surface of the bottom plate facing the reflection plate, so heat produced by the light source is mixed with air arranged in the concave structures, and produces convection current, and then, the heat is transferred to the bottom plate through the concave structures and is outwards dissipated.
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 strengthen thermal convection effectively and reach fluorescent tube optimal luminescent efficient.
Background technology
Backlight module system in the general LCD is used to provide required light source, because the backlight module size is increasing at present, the required briliancy of direct type backlight module also improves constantly, and the quantity of fluorescent tube and supply capability also must improve, yet, this will make the fluorescent tube ambient temperature raise, even and caused increasing the quantity and the supply capability of fluorescent tube, but can't increase the situation of briliancy.Know clearly it,, make its briliancy can reduce along with the increase of running time on the contrary, the problem that causes the fluorescent tube briliancy to descend because the temperature in the backlight module is too high.
Therefore, general backlight module uses the aluminium backboard to be used as main cooling mechanism, as shown in Figure 1, backlight module 10 comprises a reflecting plate (reflector sheet) 11, one light diffusing sheet 16, optical thin film layer 17a, 17b, a plurality of fluorescent tube 13 and an aluminium backboard 15.Wherein, light diffusing sheet 16 is arranged on the reflecting plate 11 in the mode that coats fluorescent tube 13, fluorescent tube 13 is as the light source of backlight module 10, and be arranged at a support portion (not shown), reflecting plate 11 is positioned at the top of aluminium backboard 15, reflect backlight module 10 in order to light, and aluminium backboard 15 is positioned at the bottom of backlight module 10, in order to transmit heat to the external world with fluorescent tube 13.
Yet, reflecting plate comes reflection source owing to arrange in pairs or groups usually in the direct type backlight module design at present, so the existence of reflecting plate makes that heat is not to be directly delivered to the aluminium backboard, but by reflecting plate again indirect transfer to the aluminium backboard, also will make the heat of backlight module inside can't transmit the external world fast Just because of this, cause the fluorescent tube ambient temperature to raise, make the briliancy of fluorescent tube descend.
Therefore, how effectively overcoming the problem of backlight module heat, and effectively improve the optical efficiency of backlight module, is one of problem that must actively solve at present, makes the luminescence efficiency of fluorescent tube reach optimization.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of backlight module, strengthen thermal convection mechanism, increase the structural strength of base plate, improve integral heat sink efficient effectively to improve the luminescence efficiency of briliancy, increase fluorescent tube with multiple umbilicate type structural design.
Another object of the present invention is to provide a kind of LCD with and backlight module, it can improve integral heat sink efficient effectively to improve briliancy, to increase the luminescence efficiency of fluorescent tube.
According to the present invention, a kind of backlight module is provided, it comprises a light source, a reflecting plate and a base plate.Reflecting plate is arranged at the light source below, and base plate is arranged at the reflecting plate below, base plate is in having a plurality of umbilicate type structures on the surface of reflecting plate, heat and the air mixed in the umbilicate type structure that light source is produced make heat transferred to base plate and outside loss via the umbilicate type structure again.
In a preferred embodiment, form a plurality of grooves between reflecting plate and the base plate, light source comprises a plurality of fluorescent tubes, groove and fluorescent tube are parallel to each other, and each groove is between two adjacent fluorescent tubes.
Again, the shape of cross section of groove is inverted V-shape or camber.
Again, backlight module also comprises a light source support, and in order to supporting light sources, light source support comprises a side and a perforate, and perforate is formed on the side.
Again, a plurality of holes are set also on the base plate, make air in the umbilicate type structure can be via hole outwards loss.
Again, the umbilicate type structure on the base plate is that the reverse direction of orientating reflex plate is outstanding.
Again, the opening shape of umbilicate type structure is one of group that is selected from circle, ellipse, strip, rectangle formation.
Again, the arrangement of umbilicate type parallelism structural, cross arrangement or irregular alignment.
In a preferred embodiment, the umbilicate type structure is a strip, and the bearing of trend of umbilicate type structure is haply perpendicular to the bearing of trend of light source.
Again, base plate is an aluminum soleplate.
Again in the present invention, provide a kind of LCD, it comprise a housing, be arranged at liquid crystal panel in the housing, and one to be arranged at the backlight module of housing with respect to liquid crystal panel.Backlight module then comprises a light source, a reflecting plate and a base plate.Reflecting plate is arranged at the light source below, and base plate is arranged at reflecting plate below base plate in a plurality of umbilicate type structures are set on the surface of reflecting plate, heat and the air mixed in the umbilicate type structure that light source is produced make heat transferred to base plate and outside loss via the umbilicate type structure again.
For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended diagram, be described in detail below.
Description of drawings
Fig. 1 is existing backlight module diagrammatic cross-section;
Fig. 2 is the LCD L of first embodiment of the invention
1Exploded perspective view;
Fig. 3 A is the backlight module B of first embodiment of the invention
1The combination schematic perspective view;
Fig. 3 B is the cut-open view of first embodiment of the invention along the AA profile line of Fig. 3 A;
Fig. 4 is the base plate schematic rear view of first embodiment of the invention;
Fig. 5 is the partial schematic diagram of fluorescent tube of the present invention and support portion;
Fig. 6 is the LCD L of second embodiment of the invention
2Exploded perspective view;
Fig. 7 is the base plate schematic rear view of second embodiment of the invention.
Embodiment
First embodiment
Fig. 2 shows the LCD L of first embodiment of the invention
1Exploded perspective view.LCD L
1Comprise a upper shell 22, a lower house 24, a liquid crystal panel 30 and bottom-lighting type back light module B
1, liquid crystal panel 30 is arranged between the upper and lower casing 22,24, backlight module B
1Be being arranged at respect to liquid crystal panel 30 among the housing 22,24, and be positioned at the below of liquid crystal panel 30, the present invention improves backlight module B
1Heat radiation function, briliancy and base arrangement, therefore omit other element in the explanation LCD.
Fig. 3 A and Fig. 3 B show backlight module B of the present invention
1Combination schematic perspective view and cut-open view, backlight module B
1Formed by a light diffusing sheet 41, a support portion 42, a plurality of light source (fluorescent tube) 46, a reflecting plate 43 and a base plate 44, be it should be noted that support portion 42 is not shown among Fig. 3 A and Fig. 3 B, be please also refer to the support portion 42 of Fig. 2.
Below for the structure of light diffusing sheet 41, support portion 42, a plurality of light source (fluorescent tube) 46, reflecting plate 43 and base plate 44 and mutual annexation thereof explanation is proposed respectively.
In the present embodiment, it is made that base plate 44 can be aluminium, therefore be also referred to as the aluminium backboard, base plate 44 is arranged at reflecting plate 43 belows, fit with reflecting plate 43 parts, base plate 44 is in a plurality of umbilicate type structures (channel) 45 are set on the surface of reflecting plate 43, also can be described as the umbilicate type runner, umbilicate type structure 45 is to give prominence in the face of the reverse direction of reflecting plate 43, that is, umbilicate type structure 45 is outstanding towards the direction of lower house 24, and is parallel to base plate 44 haply, heat and the air mixed in the umbilicate type structure 45 that light source 46 is produced make heat transferred to base plate 43 and outside loss via umbilicate type structure 45 again.
The opening shape of umbilicate type structure 45 be selected from group that circle, ellipse, strip, rectangle form one of them, also can be arranged in parallel, cross arrangement or irregular alignment.In the present embodiment, umbilicate type structure 45 be shaped as strip, and arrangement parallel to each other, the bearing of trend of umbilicate type structure 45 is haply perpendicular to the bearing of trend of light source 46 with groove 43a.
See also Fig. 4, Fig. 4 is the base plate 44 of displayed map 2 only, omits all the other elements so that know umbilicate type structure 45 on the display backpanel 44.A plurality of holes 48 also can be set on the base plate 44, it should be noted, present embodiment does not limit the shape of hole 48 and position on base plate, makes the outside loss of hot-air in the umbilicate type structure 45 by hole 48.
Moreover, as shown in Figure 5, local repressentation is in order to the support portion 42 of supporting light sources 46 on the figure, support portion 42 comprises a side 422 and a perforate 42a, perforate 42a is formed on the side 422 of support portion 42, and air can be entered smoothly in groove 43a and the umbilicate type structure 45 by perforate 42a, to reach the purpose that strengthens thermal convection, so the design of multiple runner can increase the area that produces thermal convection with air, avoids Yin Gaowen to cause backlight module B
1Luminescence efficiency descends, and improves the integral heat sink benefit.The present invention does not limit the shape of perforate 42a, though be to show rectangle on the figure, can be other shape yet.
Because hot-air is up convection current, the effect of the both sides thermal convection of existing design is less in fact, promptly, the influential effect of the thermal convection of side direction is more limited, so in backlight module design of the present invention, adopt the undaform design to make reflecting plate 43 when fitting, produce a plurality of groove 43a space with base plate 44, and in base plate 44 mechanisms, form umbilicate type structure 45 parallel to each other, therefore, more air can be entered smoothly among umbilicate type structure 45 and the groove 43a for perforate 42a by support portion 42, make the heat of fluorescent tube 46 generations and the air mixed in base plate 44 and the reflecting plate 43, by the hole 48 of base plate 44 hot-air that mixes is discharged again, to reach the purpose that strengthens thermal convection, so the design of multiple runner can increase the area that produces thermal convection with air.It should be noted that umbilicate type structure 45 is except strengthening radiating efficiency, it is structural also can to strengthen base plate 44, and therefore, umbilicate type structure 45 also can be described as reinforced ribs.
The collocation mechanism of present embodiment groove 43a and umbilicate type structure 45 is mixed the hot-airs in each umbilicate type structure 45, makes hot-air be able to smoothly perforate 42a place by hole on the base plate 44 48 or support portion 42 to flowing to the external world.Multiple like this runner design can allow backlight module B
1Internal temperature reduces, and makes fluorescent tube 46 have the good working environment temperature, because the temperature of fluorescent tube 46 reduces, the luminescence efficiency of fluorescent tube 46 is improved.
Second embodiment
Fig. 6 shows the LCD L of second embodiment of the invention
2Exploded perspective view.Fig. 7 shows the base plate schematic rear view of second embodiment of the invention.Present embodiment, LCD L
2Comprise a upper shell 22 ', a lower house 24 ', a liquid crystal panel 30 ' and bottom-lighting type back light module B
2, it should be noted that improvement of the present invention is backlight module B
2, therefore omit explanation LCD L
2Other element.
In the present embodiment, the part identical with first embodiment will repeat no more, and components identical gives identical numbering, and its difference is: backlight module B
2Base plate 44 ' have the umbilicate type structure 45 ' of difformity and arrangement mode, the umbilicate type structure 45 ' of present embodiment comprises the runner 451,452 of a plurality of strips and circular runner 453.Runner 451 arrangements parallel to each other of strip, and bearing of trend perpendicular to fluorescent tube 46 ', and the arrangement that crosses one another of another strip runner 452 and circular runner 453, in addition, on the umbilicate type structure 45 ' of base plate 44 ' a plurality of holes 48 ' are set also, therefore, various umbilicate type structures 45 ' increase the air spatial accommodation, hot-air in each umbilicate type structure 45 ' is mixed, make hot-air be able to locate flowing to the external world by the hole on the base plate 44 ' 48 ' smoothly.Umbilicate type structure 45 ' not only increases the thermal convection area, and it is structural more to strengthen base plate 44 '.
As mentioned above, the present invention can effectively utilize the collocation of umbilicate type structure and undaform reflecting plate thus, increases the thermal convection area, can allow fluorescent tube operate under the working temperature of the best, and the briliancy optimization that backlight module is produced.
Though disclosed the present invention in conjunction with above preferred embodiment; yet it is not in order to limiting the present invention, anyly is familiar with this operator, without departing from the spirit and scope of the present invention; can do some change and retouching, so protection scope of the present invention should be with being as the criterion that claim was defined.
Claims (10)
1. backlight module comprises:
One light source;
One reflecting plate is arranged at this light source below; And
One base plate is arranged at this reflecting plate below, and this base plate is in have a plurality of umbilicate type structures on the lower surface of this reflecting plate.
2. backlight module as claimed in claim 1, wherein, this reflecting plate has a plurality of grooves, and this light source comprises a plurality of fluorescent tubes, and this each groove and this each fluorescent tube are parallel to each other, and at least one this groove is between two adjacent fluorescent tubes.
3. backlight module as claimed in claim 2, wherein the shape of cross section of this each groove is inverted V-shape or camber.
4. backlight module as claimed in claim 1, it also comprises a light source support, and the two ends that are positioned at this light source are in order to support this light source, and this light source support comprises dual-side and at least one perforate, and this perforate is formed at least one this side.
5. backlight module as claimed in claim 1 wherein, also is provided with a plurality of holes on this base plate, make air in this each umbilicate type structure can be via this each hole outwards loss.
6. backlight module as claimed in claim 1, wherein, each umbilicate type structural plane of this on this base plate is outstanding to the reverse direction of this reflecting plate.
7. backlight module as claimed in claim 1, wherein the cross sectional shape of this each sunk structure is to be selected from one of circle, ellipse, strip, rectangle or its combination.
8. backlight module as claimed in claim 1, wherein this each umbilicate type structure for be arranged in parallel, cross arrangement or irregular alignment.
9. backlight module as claimed in claim 1, wherein this each umbilicate type structure is at least one runner.
10. backlight module as claimed in claim 1, wherein this base plate is an aluminum soleplate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100682420A CN100449375C (en) | 2004-08-25 | 2004-08-25 | Liquid crystal display and its back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100682420A CN100449375C (en) | 2004-08-25 | 2004-08-25 | Liquid crystal display and its back light module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588208A CN1588208A (en) | 2005-03-02 |
| CN100449375C true CN100449375C (en) | 2009-01-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100682420A Active CN100449375C (en) | 2004-08-25 | 2004-08-25 | Liquid crystal display and its back light module |
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| CN (1) | CN100449375C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100412653C (en) * | 2006-08-08 | 2008-08-20 | 友达光电股份有限公司 | Reflective plate of backlight module |
| CN101995678B (en) * | 2009-08-28 | 2015-01-07 | 阿尔派株式会社 | Display device and assembly method thereof |
| CN102798105B (en) * | 2012-09-12 | 2013-12-11 | 深圳市华星光电技术有限公司 | Backlight radiating structure and liquid crystal module |
| CN105652514A (en) * | 2015-11-13 | 2016-06-08 | 乐视致新电子科技（天津）有限公司 | Backlight module set and liquid crystal display equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5432626A (en) * | 1992-03-12 | 1995-07-11 | Hitachi, Ltd. | Liquid crystal display device with shield casing connected to frame holding the display above lower casing holding light source |
| US6089739A (en) * | 1997-09-30 | 2000-07-18 | Sony Corporation | Surface light source device |
| JP2001059961A (en) * | 1999-08-23 | 2001-03-06 | Seiko Epson Corp | Display device |
| JP2002189207A (en) * | 2000-12-19 | 2002-07-05 | Sharp Corp | Liquid crystal unit and liquid crystal display device |
-
2004
- 2004-08-25 CN CNB2004100682420A patent/CN100449375C/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5432626A (en) * | 1992-03-12 | 1995-07-11 | Hitachi, Ltd. | Liquid crystal display device with shield casing connected to frame holding the display above lower casing holding light source |
| US6089739A (en) * | 1997-09-30 | 2000-07-18 | Sony Corporation | Surface light source device |
| JP2001059961A (en) * | 1999-08-23 | 2001-03-06 | Seiko Epson Corp | Display device |
| JP2002189207A (en) * | 2000-12-19 | 2002-07-05 | Sharp Corp | Liquid crystal unit and liquid crystal display device |
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| Publication number | Publication date |
|---|---|
| CN1588208A (en) | 2005-03-02 |
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