CN1808231A - Heat radiation design of backlight module - Google Patents
Heat radiation design of backlight module Download PDFInfo
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- CN1808231A CN1808231A CN 200510002720 CN200510002720A CN1808231A CN 1808231 A CN1808231 A CN 1808231A CN 200510002720 CN200510002720 CN 200510002720 CN 200510002720 A CN200510002720 A CN 200510002720A CN 1808231 A CN1808231 A CN 1808231A
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- backlight module
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Abstract
The invention relates to a heat dissipation device for back light module, which comprises: placing plural parallel projections on a reflection base board, on the top of the projection having a first air through hole, and each top edge of the projection being able to position adjacent to tube light source; on the edge of the reflection board having plural second air through holes, a light shield is provided on the outside of the reflection bottom board for shielding each second air through holes; on the edge frame of the back light module having a flange which is provided with a slot for connecting to the inner space of the back light module, and on the bottom of the slot having a hole going through the flange to form a channel from inside of the back light module to outside; cooling air flow through the back light module is provided via the first, second and the third air through holes to prevent from forming shadow area.
Description
Technical field
The present invention is relevant with the backing structure of liquid crystal display, particularly relates to a kind of backlight module heat dissipation design that improves effect backlight.
Background technology
LCD (LCD) is applied to making various flat-panel screens at present widely, particularly LCD is compared to the cathode tube display, be more suitable for being applied to the making of giant display, present stage, colour liquid crystal display device was based on liquid crystal film transistor liquid crystal display (TFT-LCD) (TFT-LCD), its basic structure roughly is divided into liquid crystal panel (LCD Panel), plurality of groups of substrates of thin-film transistor (TFT-LCD Substrate) and backlight module (backlight), the effect of backlight module is to send visible light source, form color change to penetrate liquid crystal panel, watch for the user.
Light source in the backlight module is provided by the fluorescent tube of high brightness (high luminance) (tubularfluorescent lamps), after the even reflection of reflected bottom plate by backlight module, is projected to liquid crystal panel, so that the even brightness light source to be provided.The panel area that flat-panel screens adopted of desktop PC or notebook computer is little, its backlight module is to adopt side-light type (edge-lit) module, fluorescent tube is placed in four lateral margins of reflected bottom plate, can arrange radiator structure that thermal source is taken away at lateral margin easily, yet this kind design light source concentrates on the edge, can't provide large-area evenly backlight, and visible angle is little, therefore is not suitable for being applied to large-scale panel (panels more than 20 cun).
The backlight module of large-scale no seam formula panel display (Tiled LCD), be that fluorescent tube is parallel between liquid crystal panel and the reflected bottom plate, along with the panel of LCD increases gradually, the quantity of fluorescent tube also constantly promotes, the a large amount of heat energy of accumulation directly have influence on the running of fluorescent tube itself under the running of fluorescent tube high power.Because the brightness of fluorescent tube mainly is subjected to temperature effect, therefore variation if temperature constantly rises, then fluorescent tube brightness meeting is along with temperature changes, and directly has influence on display result; Display is to take upright setting under most of occasions in addition, and the fluorescent tube that is positioned at the top also can absorb the below heat that fluorescent tube produced except the heat that self sends, make and each fluorescent tube temperature distribution inequality cause brightness irregularities.
The heat dissipation design that therefore different structure is arranged, to satisfy the radiating requirements of backlight module, for example US6417832 connects each fluorescent tube with a heat conduction support, utilize the thermal conduction effect of heat conduction support itself to make between each fluorescent tube and produce heat interchange, and according to the level height of each fluorescent tube behind the upright ornaments of display, offer air hole (louvers) in correspondence with each other, because the thermal convection effect rises hot-air, therefore the high more fluorescent tube of level height can be accumulated many more heats that sent by the below fluorescent tube, so fluorescent tube that level height is higher, pairing air hole number is many more, dispel the heat by air hole, and make temperature uniformity between each fluorescent tube, send the light source of uniform luminance; Though this kind design can make the uniformity of temperature profile of fluorescent tube and produce uniform luminance, yet this heat conduction support also can't be taken heat outside the module out of, must see through air hole dispels the heat, air hole is opened on the reflected bottom plate, make air hole on reflecting surface, form the shadow region, and influencing catoptrical uniformity coefficient, shade was obvious more when particularly the visual angle was big.
US6650381 offers air hole at the frame of backlight module, under the prerequisite that does not influence the reflected bottom plate structure, and the heat radiation of ventilating; Right this kind radiator structure concentrates on the edge, certainly will make Temperature Distribution produce central authorities' height and low phenomenon all around, can't form even temperature distributes so that each fluorescent tube brightness is even, US6650381 also can't adjust radiating rate according to temperature variation in addition, range of temperature in the control module will make fluorescent tube along with temperature change constantly changes brightness.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of backlight module heat dissipation design, so that reducing, the light spill and leakage do not produce shade, and need not add the rate of heat dispation that temperature sensor can be regulated regional area automatically according to Temperature Distribution, improve the homogeneity of fluorescent tube in brightness in the backlight module.
Therefore, for reaching above-mentioned purpose, a kind of backlight module heat dissipation design disclosed in this invention, it includes: a base, have a reflected bottom plate and a frame around this reflected bottom plate, convex with a plurality of convex ribs parallel to each other, the apical margin of this each convex rib on this reflected bottom plate, have one first air hole, this first air hole is that the end by this convex rib extends to the other end; A plurality of tubular light sources, be arranged on this base respectively parallel to each other, with parallel to should each convex rib, the apical margin of this each convex rib is respectively towards each tubular light source projection, make this each first air hole press close to this each tubular light source, utilize this each tubular light source to block this each first air hole, and the shade that makes this each first air hole form can not influence effect backlight.
In addition, the edge of this reflected bottom plate more offers a plurality of second air holes, to strengthen ventilation flow rate, the lateral surface of this reflected bottom plate more is provided with a light shield, to block the opening of this each second air hole, this light shield medial surface also is a reflecting surface, to eliminate the shade that each second air hole forms; This frame top is also offered a plurality of the 3rd air holes to strengthen ventilation flow rate, because the 3rd air hole is positioned at liquid crystal panel and frame joint, therefore is unlikely the degree of uniformity that produces the shadow region and influence viewing area brightness.
Preferably, the present invention more is provided with a plurality of contact assemblies, in order to regulate the ventilation flow rate of this each first air hole, this each contact assembly is arranged in this each first air hole, and supported by this convex rib, change coefficient of thermal expansion by temperature variation, support this each first air hole, change ventilation flow rate to regulate respectively first air hole size.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the stereographic map of the present invention's first preferred embodiment;
Fig. 2 A, Fig. 2 B are the cut-open view of the present invention's first preferred embodiment, show the relativeness of convex rib, fluorescent tube and first air hole;
Fig. 3 A shows second air hole and light shield for the partial sectional view of the present invention's first preferred embodiment;
Fig. 3 B shows flange part for the local member stereographic map of the present invention's first preferred embodiment;
Fig. 4 A, Fig. 4 B show first air hole and difform contact assembly for the local member stereographic map of the present invention's first preferred embodiment;
Fig. 5 A, Fig. 5 B show light source, second air hole and light shield for the cut-open view of the present invention's second preferred embodiment;
Fig. 5 C shows flange part for the local member stereographic map of the present invention's second preferred embodiment.
Wherein, Reference numeral is as follows:
10-base 11-reflected bottom plate
The 111-second air hole 12-frame
13-convex rib 131-first air hole
131a-breach 132-gap
133-contact assembly 133a-stiff end
133b-contact end 134-contact assembly
14-light shield 141-opening
15-flange part 151-groove
152-perforation 153-the 3rd air hole
20-fluorescent tube 30-base
31-reflected bottom plate 311-second air hole
32-frame 33-light shield
331-opening 34-flange part
341-groove 342-perforation
343-the 3rd air hole 40-light source
Embodiment
The present invention is applied on the backlight module of large scale liquid crystal display, and the radiating requirements that provides a kind of radiator structure can solve backlight module simultaneously can make again that backlight module is kept evenly, the effect backlight of high brightness (highluminance).
See also shown in Figure 1, a kind of backlight module heat dissipation design that is provided for the present invention's first preferred embodiment, in order to be arranged at a liquid crystal panel (figure does not show) rear, effect backlight even, high brightness (high luminance) is provided, this backlight module heat dissipation design includes:
One base 10, in order to form a backlight module inner space, this base 10 has a reflected bottom plate 11 and a frame 12 around these reflected bottom plate 11 edges, this reflected bottom plate 11 and this frame 12 are positioned at the one side of this backlight module inner space, be coated with reflecting material,, convex with a plurality of convex ribs 13 on this reflected bottom plate 11 with the performance reflecting effect, this each convex rib 13 is parallel to each other, and its two end extends to the dual side-edge edge of this reflected bottom plate 11 respectively.
A plurality of fluorescent tubes 20 (tubular fluorescent lamps), in order to form a plurality of tubular light sources, be fixed in this frame 12 with its two end respectively, and be parallel to the backlight module inner space of this base 10, make its light that sends to be projeced into this reflected bottom plate 11 and this frame 12, form reflecting effect, light is projected to this liquid crystal panel equably, this each fluorescent tube 20 corresponds respectively to this each convex rib 13, and is parallel to each other and be positioned at the top of this convex rib 13 with this each convex rib 13.
See also shown in Fig. 2 A and Fig. 2 B, be the reflected bottom plate 11 of this base 10 and the diagrammatic cross-section of convex rib 13, the apical margin of this each convex rib 13, has one first air hole 131, this first air hole 131 is elongated shape, end by this convex rib 13 extends to the other end, upwards swell by this convex rib 13, make the peritreme of this first air hole 131 near this each fluorescent tube 20, with when this reflected bottom plate 11 reflects the light of these fluorescent tubes 20, the shadow region that this first air hole 131 is caused can be subjected to stopping of this fluorescent tube 20, during therefore by this backlight module top view, can not observe the shadow region of the low-light level that first air hole 131 produced, and this first air hole 131 can provide circulation of air, directly take the heat on each 20 mountain of fluorescent tube out of this backlight module by the thermal convection effect, or introduce cold air and cool off, except utilizing natural convection to drive the airflow, one fan (not shown) more can be set carry out forced convertion, strengthen cooling effect according to backlight module internal temperature conversion rotating speed.
Please consult shown in Fig. 3 A and Fig. 3 B, Fig. 3 A is the diagrammatic cross-section at these reflected bottom plate 11 edges again, and Fig. 3 B is the partial perspective view of these frame 12 apical margins.The edge of this reflected bottom plate 11 more offers a plurality of second air holes 111, to strengthen the circulation of air effect, because this second air hole 111 is to be opened in reflected bottom plate 11 fringe regions, but not be positioned at the main viewing area of this liquid crystal panel, can reduce the harmful effect of shade that second air hole 111 produced to the even back degree; In addition, the shade that the present invention is produced for removal second air hole 111, be arranged at the edge of reflected bottom plate 11 lateral surfaces with a light shield 14, with cover this second air hole 111 in these reflected bottom plate 11 outsides and opening, this light shield 14 has the opening 141 that one day, horizontal direction was offered, for the air communication mistake, inside and outside second air hole, 111 these backlight modules of connection, this light shield 14 is towards the one side of this second air hole 111, also be coated with reflecting material, form reflecting effect to remove the shade that this second air hole 111 is produced.
These frame 12 tops stretch out and form a flange part 15 that is parallel to this reflected bottom plate 11, and this flange part 15 is arranged with a groove 151, this groove 151 be surrounded on this frame 12 around, its bottom has a plurality of perforation 152 that penetrate this flange part 15; These frame 12 top places, offer a plurality of the 3rd air holes 153, connect the groove 151 of this backlight module inner space and this flange part 15, shown in Fig. 3 B, when liquid crystal panel (figure do not show) when being installed in this backlight module the place ahead, this groove 151 just can form a current path, and cooling draught can circulate inside and outside this backlight module by the 3rd air hole 153, this groove 151 and this perforation 152.
In this backlight module operation, internal temperature constantly rises and falls, in order to make temperature maintenance in the backlight module in a particular range, keep unanimity with the brightness of guaranteeing these fluorescent tubes 20, therefore in this backlight module heat dissipation design, need one and adjust mechanism, to adjust the flow of radiating airflow according to temperature variation.
Please consult again shown in Fig. 4 A, have a gap 132 between the front and back ends of this convex rib 13 and this frame 12, make this first air hole 131 before this convex rib 13, back-end location forms a breach 131a; A plurality of contact assemblies 133, be arranged at the gap 132 between this each convex rib 13 and this frame 12 respectively, this each contact assembly 133 is a block, have a stiff end 133a and a contact end 133b, it is one plane that this stiff end 133a is, and supports being affixed on this frame 12, this contact end 133b forms sharp-pointed corner angle, be resisted against the breach 131a of this first air hole 131, and this first air hole 131 is supported, the size of controlling this first air hole 131 is to adjust air mass flow; This each contact assembly 133 can vary with temperature rising-heat contracting-cold and change the volume size, and the degree that this each first air hole 131 is supported changes to some extent, should can strengthen to quicken rate of heat dispation by each first air hole 131 when temperature is high, temperature can make this each first air hole 131 dwindle to slow down rate of heat dispation when low; This each contact assembly 133 is to adopt the material of high thermal expansion coefficient to make, make its coefficient of thermal expansion be higher than the coefficient of thermal expansion of this base 10, change and make this contact assembly 133 have higher rising-heat contracting-cold, change with the air mass flow of controlling this each first air hole 131 effectively with respect to this base 10.
Please consult shown in Fig. 4 B again, contact assembly 134 for another kind of shape, this each contact assembly 134 is a lamellar body, be inserted in this first air hole 131, make its clamping that is subjected to this convex rib 13, as last embodiment, this each contact assembly 134 also is subjected to influence of temperature change and carries out the rising-heat contracting-cold variation, support this each first air hole 131, these each first air hole, 131 sizes are varied with temperature, regulate air mass flow.
Aforesaid contact assembly 133,134 can be with the temperature difference of position, change the size of this each first air hole 131, along with distributing, different temperatures adjusts air mass flow, can make in this backlight module Temperature Distribution more even, make that the brightness of these fluorescent tubes 20 is more consistent, reach best effect backlight.
Fluorescent tube takes to be suspended in the configuration mode of this reflected bottom plate top, so reflected bottom plate can make that planform changes and the setting that do not influence fluorescent tube; But in the time of need directly being arranged on the reflected bottom plate as if light-source structure, then the shape and structure of reflected bottom plate may will be restricted, and this moment is with regard to the design of necessary change radiator structure.See also shown in Fig. 5 A, be a kind of backlight module heat dissipation design that the present invention's second preferred embodiment is provided, it includes:
One base 30 has a reflected bottom plate 31 and a frame 32, and this frame 32 is surrounded on the edge of this reflected bottom plate 31, forms the inner space of a backlight module, and this reflected bottom plate 31 and this frame 32 are coated with reflecting material, forms reflecting effect.
A plurality of light sources 40 are arranged on this reflected bottom plate 31, and this each light source 40 is made of light emitting diode (LightEmitting Diode), with ray cast to this backlight module inside, form reflecting effect, light is throwed liquid crystal panel equably.
Please consult shown in Fig. 5 B and Fig. 5 C, Fig. 5 B is the diagrammatic cross-section at these reflected bottom plate 31 edges again, and Fig. 5 C is the partial perspective view of these frame 32 apical margins.A plurality of second air holes 311 are arranged at the edge of this reflected bottom plate 31; One light shield 33, be arranged at the edge of these reflected bottom plate 31 lateral surfaces, to cover the opening of this second air hole 311 at these reflected bottom plate 31 lateral surfaces, this light shield 33 has the opening 331 that one day, horizontal direction was offered, for the air communication mistake, inside and outside second air hole, 311 these backlight modules of connection, form cooling effect.This light shield 33 also is coated with reflecting material towards the one side of this second air hole 311, forms reflecting effect to remove the shade that this second air hole 311 is produced.These frame 32 tops stretch out and form a flange part 34 that is parallel to this reflected bottom plate 31, be affixed on the liquid crystal panel periphery of (figure does not show) in order to support, this flange part 34 is provided with a groove 341 that is surrounded on this frame 32, and its bottom has a plurality of perforation 342 that penetrate this flange part 34; These frame 32 top places, offer a plurality of the 3rd air holes 343, connect the groove 341 of this backlight module inner space and this flange part 34, shown in Fig. 5 C, when this liquid crystal panel is installed in this backlight module the place ahead, this groove 341 just can form a runner, and cooling draught can circulate inside and outside this backlight module by the 3rd air hole 343, this groove 341 and this perforation 342, forms a cooling draught path.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (22)
1, a kind of backlight module heat dissipation design is characterized in that, includes:
One base has a reflected bottom plate, and described reflected bottom plate is provided with a plurality of convex ribs parallel to each other, and the apical margin of described each convex rib has one first air hole; And
A plurality of tubular light sources are arranged at described base respectively parallel to each other with described each convex rib of correspondence, and the apical margin of described each convex rib is respectively towards each tubular light source projection.
2, backlight module heat dissipation design according to claim 1 is characterized in that, described each tubular light source is a fluorescent tube.
3, backlight module heat dissipation design according to claim 1 is characterized in that, described base further includes a frame around described base plate, and described each tubular light source is fixed on described each frame by its two end.
4, backlight module heat dissipation design according to claim 1 is characterized in that, described each first air hole is elongated shape, extends to the other end by an end of described convex rib.
5, backlight module heat dissipation design according to claim 1 is characterized in that, the edge of described reflected bottom plate further offers a plurality of second air holes.
6, backlight module heat dissipation design according to claim 5 is characterized in that, further includes the edge that a light shield is arranged at described reflected bottom plate lateral surface, covers the opening of described second air hole at described reflected bottom plate lateral surface.
7, backlight module heat dissipation design according to claim 6 is characterized in that, the one side towards described second air hole of described light shield is coated with reflecting material.
8, backlight module heat dissipation design according to claim 1 is characterized in that, the edge at described frame top further offers a plurality of the 3rd air holes.
9, backlight module heat dissipation design according to claim 8, it is characterized in that, described frame top stretches out and forms a flange part that is parallel to described reflected bottom plate, described flange part is concaved with a groove, described channel bottom has a plurality of perforation that penetrate described flange part, and described the 3rd air hole connects described groove.
10, backlight module heat dissipation design according to claim 1 is characterized in that, has a gap between the front and back ends of described convex rib and the described frame, makes described first air hole form a breach in the front and back end of described convex rib.
11, backlight module heat dissipation design according to claim 10 is characterized in that, further includes a contact assembly, is arranged at the gap between described convex rib and described frame, is resisted against between the breach of described frame and described convex rib by its two end.
12, backlight module heat dissipation design according to claim 11, it is characterized in that, described contact assembly is a block, have a stiff end and a contact end, described stiff end is a plane, support and be affixed on described frame, described contact end is sharp-pointed corner angle, is resisted against the breach of described first air hole.
13, backlight module heat dissipation design according to claim 10 is characterized in that, the thermal expansivity of described contact assembly is greater than the thermal expansivity of described base.
14, backlight module heat dissipation design according to claim 13 is characterized in that, further includes a contact assembly, and described contact assembly is a lamellar body, is inserted in the opening of described first air hole, makes it be subjected to the clamping of described convex rib.
15, backlight module heat dissipation design according to claim 12 is characterized in that, the thermal expansivity of described contact assembly is greater than the thermal expansivity of described base.
16, a kind of backlight module heat dissipation design is characterized in that, includes: a reflected bottom plate, the edge of described reflected bottom plate offer a plurality of second air holes; And a plurality of light sources are arranged on the described reflected bottom plate.
17, backlight module heat dissipation design according to claim 16 is characterized in that, described light source is a light emitting diode.
18, backlight module heat dissipation design according to claim 16 is characterized in that, further includes the edge that a light shield is arranged at described reflected bottom plate lateral surface, covers described each second air hole in the opening of described reflected bottom plate lateral surface.
19, backlight module heat dissipation design according to claim 18 is characterized in that, the one side towards described second air hole of described light shield is coated with reflecting material.
20, backlight module heat dissipation design according to claim 16 is characterized in that, further includes a frame, be surrounded on described base plate around.
21, backlight module heat dissipation design according to claim 20 is characterized in that, the edge at described frame top more offers a plurality of the 3rd air holes.
22, backlight module heat dissipation design according to claim 21, it is characterized in that, described frame top stretches out and forms a flange part that is parallel to described reflected bottom plate, described flange part is concaved with a groove, described channel bottom has a plurality of perforation that penetrate described flange part, and described the 3rd air hole connects described groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100027202A CN100368889C (en) | 2005-01-19 | 2005-01-19 | Heat radiation design of backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100027202A CN100368889C (en) | 2005-01-19 | 2005-01-19 | Heat radiation design of backlight module |
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| Publication Number | Publication Date |
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| CN1808231A true CN1808231A (en) | 2006-07-26 |
| CN100368889C CN100368889C (en) | 2008-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100027202A Expired - Fee Related CN100368889C (en) | 2005-01-19 | 2005-01-19 | Heat radiation design of backlight module |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102054398A (en) * | 2009-11-06 | 2011-05-11 | 乐金显示有限公司 | Flat display device with light shielding layer |
| CN101251681B (en) * | 2008-04-09 | 2012-09-19 | 友达光电股份有限公司 | Backlight module with supporting device |
| WO2013170503A1 (en) * | 2012-05-15 | 2013-11-21 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN110687717A (en) * | 2018-07-04 | 2020-01-14 | 光远科技股份有限公司 | Heat exchange device and display device |
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| JPH10170912A (en) * | 1996-12-09 | 1998-06-26 | Sony Corp | Picture light source device |
| US5986728A (en) * | 1997-07-23 | 1999-11-16 | Litton Systems, Inc. | Optically enhance day/night liquid crystal display backlight with TIR lens and both light sources on same side of waveguide |
| JP3770057B2 (en) * | 2000-06-20 | 2006-04-26 | カシオ計算機株式会社 | Surface light source device |
| JP2002189207A (en) * | 2000-12-19 | 2002-07-05 | Sharp Corp | Liquid crystal unit and liquid crystal display device |
| JP2002196326A (en) * | 2000-12-26 | 2002-07-12 | Hitachi Ltd | Liquid crystal display device |
| CN2505952Y (en) * | 2001-11-28 | 2002-08-14 | 廖骏吉 | Poor light hood base structure |
| CN1276299C (en) * | 2003-01-06 | 2006-09-20 | 中强光电股份有限公司 | Backlight plate device |
| CN1297849C (en) * | 2003-02-19 | 2007-01-31 | 明基电通股份有限公司 | Light-emitting diode backlight module |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101251681B (en) * | 2008-04-09 | 2012-09-19 | 友达光电股份有限公司 | Backlight module with supporting device |
| CN102054398A (en) * | 2009-11-06 | 2011-05-11 | 乐金显示有限公司 | Flat display device with light shielding layer |
| CN102054398B (en) * | 2009-11-06 | 2014-04-02 | 乐金显示有限公司 | Flat display device with light shielding layer |
| US9985084B2 (en) | 2009-11-06 | 2018-05-29 | Lg Display Co., Ltd. | Flat display device with light shielding layer |
| WO2013170503A1 (en) * | 2012-05-15 | 2013-11-21 | 深圳市华星光电技术有限公司 | Backlight module and display device |
| CN110687717A (en) * | 2018-07-04 | 2020-01-14 | 光远科技股份有限公司 | Heat exchange device and display device |
| CN110687717B (en) * | 2018-07-04 | 2022-05-10 | 光远科技股份有限公司 | Heat exchange device and display device |
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|---|---|
| CN100368889C (en) | 2008-02-13 |
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Granted publication date: 20080213 Termination date: 20180119 |