CN1854833A

CN1854833A - Cooling arrangement for a liquid crystal display

Info

Publication number: CN1854833A
Application number: CNA2006100773575A
Authority: CN
Inventors: 金元年
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2005-04-29
Filing date: 2006-04-29
Publication date: 2006-11-01
Also published as: KR100661658B1; KR20060113177A

Abstract

A liquid crystal display device includes a liquid crystal panel, a back light unit disposed at a rear portion of the liquid crystal panel and supplying light to the liquid crystal panel, a bottom chassis to accommodate the back light unit, and a heat pipe to dissipate the heat from the back light unit to an outside of the bottom chassis.

Description

LCD with heat abstractor

Technical field

The total design of the present invention relates to a kind of LCD (LCD), relates in particular to the heat abstractor that the LCD perimeter is arrived in a kind of thermal transpiration that the back light unit of LCD is produced.

Background technology

LCD comprises liquid crystal panel, and liquid crystal panel has thin film transistor base plate, filter substrate and flows into liquid crystal between the two substrates.LCD also comprises the back light unit that light is provided to liquid crystal panel, because liquid crystal panel is a light-emitting device not.Control by the ordered state of liquid crystal from the optical transmission rate of back light unit emission.

According to the position of light source, this back light unit is called as direct light type back light unit and peripheral type back light unit.

The peripheral type back light unit is generally used in the small LCD of monitor of the monitor of monitor, desk-top computer such as kneetop computer or portable terminal.Such back light unit comprises the light guide plate that is arranged at the liquid crystal panel back side; The lamp unit is supplied to liquid crystal panel along the side surface setting of light guide plate and with light at least; And optical sheet, it is arranged on the top and the diffusion of light guide plate or collects by the light of light-guide plate guides to liquid crystal panel.At this, the lamp unit can use electroluminescence (EL) unit, cold-cathode fluorescence lamp (CCFL), hot-cathode fluorescent lamp (HCFL), external electrode fluorescent lamp (EEFL), light emitting diode (LED) etc.Utilize this structure, when optical routing light guide plate and optical sheet change, the light that sends from the lamp unit may enter liquid crystal panel.

But, in this conventional LCD,, make deterioration in brightness and produce gamut because the heat that produces at place, lamp unit produces at light guide plate or optical sheet place and form flicker.

Summary of the invention

Total design of the present invention provides a kind of liquid crystal indicator, and its heat that efficiently back light unit is produced is dispersed into the zone outside the back light unit.

Other aspects of total design of the present invention and advantage will partly be set forth in the following description, and its part will be understood from describe, and perhaps can learn by putting into practice the present invention.

Above-mentioned and/or other aspects of total design of the present invention can realize that it comprises by a kind of liquid crystal indicator is provided: liquid crystal panel, in order to form image; Back light unit, the back of liquid crystal panel shown in being arranged at and to shown in the liquid crystal panel supply light; Underframe is in order to hold described back light unit; And heat pipe, be used for the heat that described back light unit produces is dispersed into zone outside the described underframe.

Described back light unit can comprise light guide plate and LED unit, and described light guide plate has at least one plane of incidence, and described LED unit is along the plane of incidence setting of described light guide plate and to described liquid crystal panel supply light.

Described heat pipe can comprise at least one its zone and at least one end, the front surface of described at least one the described LED of contact unit, zone, and described at least one end is exposed to the zone outside the described underframe.

The plane of incidence of described light guide plate is provided as a pair of plane of incidence, and each plane of incidence is positioned opposite to each other, and described heat pipe is provided as a pair of heat pipe corresponding to each plane of incidence.

The plane of incidence of described light guide plate can comprise vertically disposedly goes up plane of incidence and following plane of incidence, and is provided in the described heat pipe of going up the plane of incidence side and couples with mode and the described LED unit that roughly walks abreast.

Being provided in the running penetrates the heat pipe of planar side and can comprise: first thermal conduction portions contacts the heat that produces from described LED unit with conduction with the front surface of described LED unit; Second thermal conduction portions extends upward and the surface of each plane of incidence adjacency of contact and described light guide plate from described first thermal conduction portions; And the 3rd thermal conduction portions, extend and be exposed to zone outside the described underframe from described second thermal conduction portions.

Described light guide plate is provided as rectangular shape, and described second thermal conduction portions is provided as a pair of second thermal conduction portions, its contact is in abutting connection with two side surfaces of each plane of incidence, and described the 3rd thermal conduction portions is provided as a pair of the 3rd thermal conduction portions, and it is corresponding to each second thermal conduction portions.

Described liquid crystal indicator can also comprise a plurality of heat radiating fins, two distolateral coupling of described heat radiating fin and each heat pipe.

Described liquid crystal indicator can also comprise at least one hot draught fan, and it is installed in abutting connection with at least one described heat radiating fin.

Above-mentioned and/or other aspects of total design of the present invention can also realize that it comprises by a kind of liquid crystal indicator is provided: heat conduction member, with the LED unit thermo-contact with a plurality of LED of back light unit; Cooling duct is with described heat conduction member thermo-contact and hold heat-transfer fluid; Heating radiator is connected to receive heat with described cooling duct; And ebullator, the described heat-transfer fluid of circulation between described cooling duct and described heating radiator.

Described liquid crystal indicator can also comprise the draught fan that cools off described heating radiator.

Described heat conduction member can comprise heat pipe.

Each all provides two at least described cooling duct, described heating radiator and described ebullator.

Described liquid crystal indicator can also comprise: module supports, in order to respect to the described heat pipe of described LED unit supports; And pipe support, be arranged between one of described heat pipe and described LED unit and described module support, and depression is with the described heat pipe of press fit, with the area of conduction heat between increase and the described heat pipe.

Above-mentioned and/or other aspects of total design of the present invention can also realize that it comprises by a kind of liquid crystal indicator is provided: back light unit, and it has the LED unit that comprises a plurality of LED; At least one heat conduction member is with described LED unit thermo-contact; At least one group of heat radiating fin, with described heat conduction member thermo-contact to distribute the heat that produces by described LED unit; At least one draught fan is dispersed into outside the described liquid crystal indicator with ventilating air and with heat with the adjacent setting of described at least one group of heat radiating fin.

Above-mentioned and/or other aspects of total design of the present invention can also realize that it comprises by a kind of display device is provided: one or more lids; Display module, be arranged within the inner space that provides by described one or more lids, have the back light unit that produces light and utilize described light to form the panel of image, described back light unit has in order to luminous light source and the optical plate that is used for the photoconduction of being launched is guided to described panel; And cooling unit, be arranged at around the described back light unit, be put into outside the described display module with hot type that will at least one generation from described light source and described optical plate.

Description of drawings

By following description to embodiment, these of total design of the present invention and/or other aspects and advantage will become and obviously and more easily understand in conjunction with the accompanying drawings, in the accompanying drawings:

Fig. 1 is the skeleton view that shows according to the LCD of the embodiment of total design of the present invention.

Fig. 2 is the skeleton view of liquid crystal (LC) module that shows the LCD of Fig. 1.

Fig. 3 is the cross-sectional view that the LC module of Fig. 2 is shown.

Fig. 4 illustrates the light guide plate of LC module of Fig. 2 and the skeleton view of heat pipe.

Fig. 5 illustrates according to the present invention the light guide plate in the Liquid Crystal Module of LCD of embodiment of total design and the skeleton view of heat pipe.

Fig. 6 is the skeleton view that shows according to the back light unit of the embodiment of total design of the present invention.

Fig. 7 is the skeleton view that the back light unit of Fig. 6 is shown.

Fig. 8 is the skeleton view of draught fan that the back light unit of Fig. 6 is shown.

Fig. 9 is the skeleton view of heat pipe that the back light unit of Fig. 6 is shown.

Embodiment

Now will be in detail with reference to the embodiment of total design of the present invention, its example is shown in the drawings, and wherein similarly Reference numeral is indicated similar elements in the whole text.Embodiment is described to explain total design of the present invention below with reference to accompanying drawing.

Fig. 1 to 4 has showed according to the LCD of the embodiment of total design of the present invention (LCD).Referring to figs. 1 to 4, this LCD comprises protecgulum 80, Liquid Crystal Module 1, main substrate 2 and bonnet 90.Liquid Crystal Module 1 has liquid crystal panel 10 to form image.Back light unit 20 is arranged on the back of liquid crystal panel 10, with to liquid crystal panel 10 supply lights.Underframe 30 is arranged on the bottom of back light unit 20 and holds light unit 20, and upper frame 37 is arranged on the top of liquid crystal panel 10 and couples with underframe 30.LCD also comprises

heat pipe

40 and 50, will be dispersed into the perimeter of underframe 30 from the heat of back light unit 20.Main substrate 2 is applied to Liquid Crystal Module 1 with signal.Protecgulum 80 is arranged on Liquid Crystal Module 1 front with covering liquid crystal module 1, and bonnet 90 is arranged on the back of main substrate 2 to cover main substrate 2.

Liquid crystal panel 10 comprises thin film transistor base plate 11, filter substrate 12 and flows into liquid crystal layer (not shown) between two substrates 11 and 12.Liquid crystal panel 10 forms image according to the distribution of liquid crystal, and needs back light unit 20 that light source is provided, because liquid crystal panel 10 is light-emitting devices not.At this, liquid crystal panel 10 is provided with source electrode printed circuit board (PCB) (PCB) 13 and grid PCB14 to drive liquid crystal panel 10.

Be respectively applied to data flexible circuit film 15 and grid flexible circuit film 16 from the drive signal of source PCB 13 and grid PCB14 supply, and then be applied to liquid crystal panel 10.Data driving chip 15a and grid drive chip 16a are installed in respectively in data flexible circuit film 15 and the grid flexible circuit film 16, being applied to liquid crystal panel 10 from the drive signal of source PCB 13 and grid PCB14 supply.

With reference to figure 2 and 3, back light unit 20 comprises the back that is arranged at liquid crystal panel 10 and has the light guide plate 21 of plane of

incidence

21a and 21b, but may only need a plane of incidence when operation back light unit 20.Back light unit 20 also comprises

LED unit

22 and 23 and optical sheet 25,

LED unit

22 and 23 is along the plane of incidence 21a of

light guide plate

21 and 21b provides and light is supplied to liquid crystal panel 10, and the top that optical sheet 25 is arranged on light guide plate 21 is with diffusion or collect the light that is guided from

LED unit

22 and 23 to light guide plate 21.Back light unit 20 is contained in the underframe 30 of the bottom that is arranged at the LCD module.The bottom of underframe 30 accommodates reflector plate 35 in dividing, and the light that reflector plate 35 will leak from the opposite direction of liquid crystal panel 10 from the light of

LCD unit

22 and 23 emissions reflects to light guide plate 21.

Light guide plate 21 has and is roughly the tabular of rectangle.Light guide plate 21 comprises: a pair of plane of

incidence

21a and 21b positioned opposite to each other make them face the corresponding person of

LED unit

22 and 23 respectively to receive from the light of

LED unit

22 and 23 emissions; Face the plane of reflection 21d of reflector plate 35 at a predetermined angle, with the incident light of reflection from plane of

incidence

21a and 21b; And in the face of the rear surface of liquid crystal panel 10 go out optical plane 21e, make light to leave towards liquid crystal panel 10.

The a pair of plane of incidence 21a of

light guide plate

21 and 21b can be called as plane of incidence 21a and following plane of incidence 21b.Last plane of incidence 21a LED unit 22 vis-a-vis is provided with, and following plane of incidence 21b LED unit 23 vis-a-vis is provided with, and LED unit 22 can be called as the LED unit, and LED unit 23 can be called as LED unit down.

LED unit

22 and 23 provides as the pair of LEDs unit up and down.Upwards plane of incidence 21a is luminous in

last LED unit

22, and 23 downward plane of incidence 21b are luminous in following LED unit.Be arranged with led section in each

LED unit

22 and 23, it can be with red (R), green (G) and blue (B) mixture of colours to launch white light along each plane of

incidence

21a and 21b.

Fig. 4 shows an

opposite heat tube

40 and 50 that corresponds respectively to each LED unit 22 and 23.LED unit 22 is gone up in last heat pipe 40 contacts, and following heat pipe 50 contacts are LED unit 23 down.

Last heat pipe 40 comprises LED contact portion 41 and

last expose portion

42 and 43, and last LED contact portion 41 can contact the front surface of LED unit 22, and

last expose portion

42 and 43 is from two distolateral extensions of last LED contact portion 41 and be exposed to outside the underframe 30.Last heat pipe 40 can be parallel to that LED unit 22 is provided with and with 22 parallel connections of last LED unit.22 heat that produce are transferred to expose

portion

42 and 43 along last LED contact portion 41 from last LED unit, and are discharged into the outside of underframe 30.

Distolateral (that is the last expose portion 42 and 43) of last heat pipe 40 can be couple to a plurality of heat radiating fins 60 and 61 respectively.Therefore,

last expose portion

42 and 43 and/or the sectional area of the heat radiating fin 60 that is used for dispelling the heat and 61 increase, make and can realize heat radiation more efficiently by a plurality of heat radiating fins 60 and 61.

With reference to figure 4, following heat pipe 50 comprises that first thermal conduction portions, 51, the first thermal conduction portions 51 can contact down the front surface of LED unit 23 and the heat that conduction produces from following LED unit 23.Following heat pipe 50 also comprises a pair of second thermal conduction portions 52 and the 53 and the 3rd

thermal conduction portions

54 and 55, second thermal conduction portions 52 and 53 distolateral extensions from first thermal conduction portions 51, with contact and each corresponding plane of incidence 21a sidepiece 21c adjacent with 21b of light guide plate 21, the 3rd

thermal conduction portions

54 and 55 is extended and is exposed to outside the underframe 30 from each second thermal conduction portions 52 and 53.Therefore, the heat that produces from following LED unit 23 is delivered to the 3rd

thermal conduction portions

54 and 55 from first thermal conduction portions 51 and second thermal conduction portions 52 and 53, thus heat is dispersed into the zone outside the underframe 30.Second thermal conduction portions 52 and 53 of following heat pipe 50 is bent upwards in an approximate vertical direction, so heat pipe 50 interior fluids can flow relatively smoothly down.That is if heat pipe 50 absorptions are from the heat of following LED unit 23 down, the fluid within the following heat pipe 50 can become gas.At this moment, gas can along by second thermal conduction portions 52 and 53 guidings upward to easy motion, so that heat is dispersed into outside the underframe 30, and fluid can turn back to first thermal conduction portions 51 immediately by gravity then, has improved heat transfer efficiency thus.

Second thermal conduction portions 52 with 53 with contact in abutting connection with each plane of incidence 21a of light guide plate 21 and the side 21c of 21b, so the heat among the side 21c of light guide plate 21 can be discharged into the outside effectively.

Distolateral (that is the 3rd thermal conduction portions 54 and 55) of following heat pipe 50 can be couple to the corresponding person of a plurality of heat radiating fins 60 and 61.Therefore, its sectional area is along with near

heat radiating fin

60 and 61 and increase, so can more effectively dispel the heat by a plurality of heat radiating fins 60 and 61.

A plurality of heat radiating fins 60 and 61 each all be formed with upside by hole (not shown) and downside by the hole (not shown), make and go up heat pipe 40 and following heat pipe 50 can pass heat radiating fin 60 and 61.

Heat pipe

40 and 50 and

heat radiating fin

60 and 61 can be collectively referred to as cooling unit, will be put into the outside of LC module 1, the i.e. outside of liquid crystal panel from the hot type that LED22 and/or light guide plate 21 produces.

As shown in Figure 1, LCD also comprises

draught fan

70 and 71, and it can be provided with in abutting connection with heat radiating fin 60 and 61.Draught

fan

70 and 71 ventilates by forcing from the conduction heat of

heat radiating fin

60 and 61, thereby heat is dispersed into its outside more efficiently.Bonnet 90 is formed with

pore

90a and 90b, and it allows air to enter and/or leave LCD and corresponding to the position of draught fan 70 and 71.And draught

fan

70 and 71 allows the zone between the air contact heat radiating fin 60 and 61.

With reference to figure 3; optical sheet 25 comprises diffuser 26; diffuser 26 is arranged on the top of light guide plate 21 and is formed with the pearl coating; with the incident light of diffusion from light guide plate 21; optical sheet 25 can also comprise two or three overlapping sheets, prism film 27 and diaphragm 28; prism film 27 is arranged on the top of diffuser 26 and collects perpendicular to the light in the direction on the plate surface of liquid crystal panel 10, and diaphragm 28 is provided between liquid crystal panel 10 and the prism film 27, is protecting liquid crystal panel 10.

When prism film 27 comprised two, direct projection prism film and adverse prism film can be used as these two.On each prism film, form microprism at a predetermined angle.Therefore, handle incident light on respect to the vertical direction of the position of liquid crystal panel 10, kept uniform brightness thus from diffuser 26.

With reference to figure 2, underframe 30 has rectangular shape, and holds liquid crystal panel 10 and back light unit 20.Underframe 30 is formed with exposed

hole

30a and 30b, and it allow to go up the

last expose portion

42 and 43 and descend the 3rd

thermal conduction portions

54 and 55 of heat pipe 50 to be exposed to the outside of underframe 30 of heat pipe 40, as shown in Figure 2.

In the present embodiment, shown in Fig. 1 to 4, two distolateral perimeters that all are exposed to underframe 30 of last heat pipe 40 and following heat pipe 50.Perhaps, according to the embodiment of total design of the present invention, as shown in Figure 5,

heat radiating fin

60 and 61 can have only a distolateral outside that is exposed to underframe 230.With reference to figure 5, Liquid Crystal Module 1 provides upper frame 37, expose portion 240 that contacts with underframe 230 and the thermal conduction portions 250 of extending from a side of Liquid Crystal Module 1.Expose portion 240 and thermal conduction portions 250 and one group of heat radiating fin 60 thermo-contact, this provides heat radiation for the LED unit (not shown) in the Liquid Crystal Module 1.

In the present embodiment,

LED unit

22 and 23 and

heat pipe

40 and 50 be arranged on the upper and lower of light guide plate 21, perhaps,

LED unit

22 and 23 and

heat pipe

40 and 50 can be arranged on the side of light guide plate 21.

Shown in Fig. 6 and 8, comprise according to the LCD of the embodiment of total design of the present invention: back light unit 20, it has LED unit 25a and 25b, and LED unit 25a and 25b have a plurality of LED27; Heat conduction member (not shown) with LED unit 25a and 25b thermo-contact; With the heat conduction member thermo-contact and wherein have the cooling duct 81 of heat-transfer fluid; The heating radiator 83 that is connected with cooling duct 81 is to receive the heat that is produced by LED unit 25a and 25b; And between cooling duct 81 and heating radiator 83 ebullator 85 of cycling hot conducting fluid.In addition, as shown in Figure 8, LCD comprises that also draught fan 91 is with cooling radiator 83.

Heat conduction member is delivered to cooling duct 81 with the heat of LED unit 25a and 25b generation.The material of heat conduction member can be had the material that is suitable for from the heat transfer characteristic of LED unit 25a and 25b conduction heat and constituted by multiple, for example, has the aluminium of thermal conductive resin.Heat conduction member can be one of polytype, and it will be pasted with the heat radiating fin of protrusion, with the broadening area of dissipation.Such heat conduction member can be and the heat pipe 45 of LED unit 25a and 25b thermo-contact that heat pipe 45 has the pipeline of circle or elliptic cross-section.

Cooling duct 81 is with heat pipe 45 thermo-contacts and accommodate heat-conducting fluid.Cooling duct 81 is by receiving from the heat of heat pipe 45 conduction with the thermo-contact of heat pipe 45 and cooling off the temperature of heat pipe 45.Therefore, cooling duct 81 makes in the heat pipe 45 the heat cooling that produces, and the heat-conducting fluid of heat pipe 45 inside circulation and continue LED unit 25a and 25b are remained on lower temperature.Therefore, the heat pipe 45 that is cooled off by cooling duct 81 is in than LED unit 25a and the lower temperature of 25b, and makes LED unit 25a and 25b remain on lower temperature, has cooled off LED unit 25a and 25b thus efficiently.

Heating radiator 83 is connected with cooling duct 81 and cools off heat-conducting fluid, and heat-conducting fluid temperature with heat pipe 45 thermo-contacts the time raises.Heating radiator 83 is made of good Heat Conduction Material, and easily to discharge the heat that is produced by LED unit 25a and 25b, this material promptly has the aluminum or the other materials of thermal conductive resin.Heating radiator 83 is equipped with a plurality of heat radiating fin (not shown), and with the contact area of increase with air, heating radiator 83 can adopt the heating radiator of conventional number of different types to realize efficient cooling.As shown in Figure 8, heating radiator 83 is equipped with at least one draught fan 91.Heating radiator 83 can provide the housing 93 that is provided with draught fan 91, forms housing 93 so that air flue to be provided.

Ebullator 85 is provided between cooling duct 81 and the heating radiator 83, so that the heat-transfer fluid circulation.Ebullator 85 is installed in the back of back light unit 20.Ebullator 85 can be worked in the schedule time behind the power-off of LED27.

As shown in Figure 8, draught fan 91 is arranged on the side of the housing 93 of heating radiator 83.Draught fan 91 is to heating radiator 83 bubbling airs, with the heat of cooling from heat pipe 45 conduction.That is draught fan 91 comes cooling radiator 83 by forcing convection current, the heat that heat pipe 45 places are produced conduction fast thus.A plurality of draught fans 91 corresponding to a plurality of heating radiators 83 can be provided.Draught fan 91 can be worked in the schedule time behind the power-off of LED27.

Utilize this structure, with following description according to the diabatic process of the embodiment of total design of the present invention and the cooling of LCD.

Luminous and the therefore heating of a plurality of LED27.The heat that produces from LED27 is transmitted to LED unit 25a and the 25b the back that is provided in LED27, distributes the heat that is generated thus.This moment, LED unit 25a and 25b are cooled off by heat pipe 45.In addition, cooling duct 81 holds the heat-transfer fluid that is cooled off by the draught fan in the heating radiator 83 91, and the heat-transfer fluid of cooling is recycled pump 85 circulations with cooling heat pipe 45.

Therefore, heat-transfer fluid cooling heat pipe 45 and with the LED27 of heat pipe 45 thermo-contacts, improve the efficient of LED27 thus and reduce the temperature difference, to keep the monochromaticity of LED.Each of LED unit 25a and 25b can also comprise thermal sensor (not shown) and controller (not shown), the temperature of thermal sensor sensing LED unit 25a and 25b, and the draught fan 91 that controller control is installed in each heating radiator 83 comes blow air.That is thermal sensor and controller can keep uniform temperature between LED unit 25a and 25b.

As shown in Figure 7, the LCD according to the embodiment of total design of the present invention can comprise: be installed in a plurality of LED unit 25 at the back of liquid crystal panel 10, it has a plurality of LED27; Heat conduction member (not shown) with LED unit 25a and 25b thermo-contact; Heat conduction member (not shown) with each LED unit 25 thermo-contact; With the heat conduction member thermo-contact and hold the cooling duct 81a and the 81b of heat-transfer fluid; The scatterer 83a and the 83b that are connected and receive the heat of LED unit 25 generations with cooling duct 81a with 81b, the ebullator 85 of cycling hot conducting fluid between cooling

duct

81a and 81b and scatterer 83a and 83b.As shown in Figure 8, LCD comprises that also draught fan 91 is with cooling radiator 83.

As shown in Figure 7, LED27 will be fed to liquid crystal panel 10 at the light of the back of back light unit 20 generation.LED27 is arranged on the back side of back light unit 20 and is installed in a plurality of LED unit 25.

LED unit 25 is arranged on the back side of liquid crystal panel 10.LED unit 25 is equipped with vertically tabular led board (not shown), and to support a plurality of LED27 and to couple with it, LED unit 25 also is equipped with the circuit pattern (not shown), with the LED27 that drives on the led board surface.Each LED27 is arranged on 25 places, LED unit, separates each other.A plurality of LED unit 25 separates each other, and constitutes the heat that is produced from LED27 to distribute by the good material of thermal conductivity, and described material is aluminium or the different materials with thermal conductive resin.

The heat conduction member (not shown) can provide with multiple material and shape according to present embodiment, and can be used as heat pipe 45 and provide.

As shown in Figure 9, heat pipe 45 is press fit in the spill pipe support 95, makes the heat pipe 45 and the area of spill pipe support 95 thermo-contacts increase.Pipe support 95 supports 97 places depression at the led module that supports LED unit 25, allows press fit heat pipe 45.Heat pipe 45 is provided as circle or oval pipe, and working fluid and seal that it comprises in the pipe do not leak into outside the pipe to prevent working fluid.Heat pipe 45 at the rear portion of LED unit 25 corresponding to every row LED unit 25.That is, a plurality of heat pipes 45 can be provided.Therefore, heat pipe 45 contact LED unit 25 are press fit in the pipe support 95 simultaneously, come cooling LED unit 25 equably thus.

Though this embodiment shown in Figure 9 is provided with LED27 and heat pipe 45 and arranges differently with the embodiment shown in Fig. 6 and 8, be similar to the embodiment of Fig. 6 and 8 according to the heat radiation process of the embodiment of Fig. 8, will be not described further this process.

As mentioned above, total design of the present invention provides the back light unit 20 that adopts LED27, but it is not subject to this, and total design of the present invention can be used for the electric device of the other types of the dissimilar light source that can dispel the heat.

According to total design of the present invention, it is distolateral that a plurality of

heat radiating fins

60 and 61 are couple to heat

pipe

40 and 50 two, thereby when the heat pipe 40 that is used to dispel the heat and 50 and/or the sectional area of

heat radiating fin

60 and 61 when increasing, can finish heat radiation more efficiently, and

draught fan

70 and 71 forces the hot-fluid of

LED unit

23 and 25 conduction to lead to

heat radiating fin

60 and 61, thus heat radiation efficiently.

In addition, total design of the present invention provide cooling duct 81, heating radiator 83 and with the ebullator 85 of heat pipe 45 thermo-contacts, and

heat pipe

45 and 25 thermo-contacts of LED unit, to distribute the heat that produces by LED27, heat radiation quickly and evenly thus, improve the efficient of LED27, and reduce the temperature difference to keep monochromaticity and temperature.

Though showed and described some embodiment of total design of the present invention, what it will be appreciated by those skilled in the art that is, can make variation in these embodiments, and not deviating from total principle and the spirit of conceiving of the present invention, the present invention is that scope is defined in claim and important document of equal value thereof.

The application requires the korean patent application No.2005-0036097 that submits on April 29th, 2005 in Korea S Department of Intellectual Property and the rights and interests of the korean patent application No.2005-0050970 that submits on June 14th, 2005, at this it is introduced in full to do reference.

Claims

1. liquid crystal indicator, it comprises:

Liquid crystal panel is in order to form image;

Back light unit is arranged at the back of described liquid crystal panel and to described liquid crystal panel supply light;

Underframe is in order to hold described back light unit; And

Heat pipe is used for the heat that described back light unit produces is dispersed into outside the described underframe.

2. liquid crystal indicator as claimed in claim 1, wherein said back light unit comprises:

Light guide plate, it has at least one plane of incidence; And

Light emitting diode is along the plane of incidence setting of described light guide plate and to described liquid crystal panel supply light.

3. liquid crystal indicator as claimed in claim 2, wherein said heat pipe comprises:

Its at least one zone, this zone contacts the front surface of described light emitting diode; And

At least one end, it is exposed to outside the described underframe.

4. liquid crystal indicator according to claim 3, wherein:

The described plane of incidence of described light guide plate comprises a pair of plane of incidence positioned opposite to each other with respect to the core of described light element; And

Described heat pipe comprises the opposite heat tube corresponding to described corresponding plane of incidence.

5. liquid crystal indicator according to claim 4, the described plane of incidence of wherein said light guide plate comprises:

Vertically disposed plane of incidence and the following plane of incidence gone up; And

Described heat pipe, it is provided in the side of described upward plane of incidence and couples with roughly parallel mode and described LED unit.

6. liquid crystal indicator according to claim 5 wherein is provided in the running and penetrates the described heat pipe of planar side and comprise:

First thermal conduction portions contacts the heat that produces from described light emitting diode with conduction with the front surface of described light emitting diode;

Second thermal conduction portions extends upward and contacts in abutting connection with the surface of the light emitting diode of each plane of incidence of described light guide plate from described first thermal conduction portions; And

The 3rd thermal conduction portions is extended and is exposed to outside the described underframe from described second thermal conduction portions.

7. liquid crystal indicator according to claim 6, wherein:

Described light guide plate is provided as rectangular shape; And

Described second thermal conduction portions comprises a pair of second thermal conduction portions, its contact and two adjacent side surfaces of corresponding plane of incidence; And

Described the 3rd thermal conduction portions comprises a pair of the 3rd thermal conduction portions, and it is corresponding to corresponding described second thermal conduction portions.

8. liquid crystal indicator according to claim 7 also comprises:

A plurality of heat radiating fins are with two distolateral coupling of corresponding heat pipe.

9. liquid crystal indicator according to claim 8 also comprises:

At least one hot draught fan is installed in abutting connection with at least one described heat radiating fin.

10. liquid crystal indicator, it comprises:

Back light unit, it has the light emitting diode that comprises one or more light emitting diodes;

Heat conduction member is with the described light emitting diode thermo-contact of described back light unit;

Cooling duct is with described heat conduction member thermo-contact and hold heat-transfer fluid;

Heating radiator is connected to receive heat from described cooling duct with described cooling duct; And

Ebullator, the described heat-transfer fluid of circulation between described cooling duct and described heating radiator.

11. liquid crystal indicator according to claim 10 also comprises:

Draught fan cools off described heating radiator.

12. liquid crystal indicator according to claim 10, wherein said heat conduction member comprises heat pipe.

13. liquid crystal indicator according to claim 10, each all provides two at least wherein said cooling duct, described heating radiator and described ebullator.

14. liquid crystal indicator according to claim 12 also comprises:

Module supports, in order to support described heat pipe with respect to described light emitting diode; And

Pipe support is arranged between one of described heat pipe and described light emitting diode and described module support, and depression is with the described heat pipe of press fit, with the area of conduction heat between increase and the described heat pipe.

15. liquid crystal indicator according to claim 10 also comprises:

Pipe support is formed with depression, carries out heat conducting area with described heat conduction member of press fit and increase with described heat pipe.

16. a liquid crystal indicator, it comprises:

Back light unit, it has the light emitting diode that comprises a plurality of light emitting diodes;

At least one heat conduction member is with described light emitting diode thermo-contact;

At least one group of heat radiating fin, with described heat conduction member thermo-contact to distribute the heat that produces by described light emitting diode;

At least one draught fan is dispersed into outside the described liquid crystal indicator with ventilating air and with heat with the adjacent setting of described at least one group of heat radiating fin.

17. a display device, it comprises:

One or more lids;

Display module, be arranged within the inner space that provides by described one or more lids, have the back light unit that produces light and utilize described light to form the panel of image, described back light unit has in order to luminous light source and the optical plate that is used for the photoconduction of being launched is guided to described panel; And

Cooling unit is arranged at around the described back light unit, is put into outside the described display module with hot type that will at least one generation from described light source and described optical plate.

18. display device as claimed in claim 17, wherein said display module comprises in order to hold the frame of described back light unit, and described cooling unit comprises first cooling component and second cooling component, described first cooling component is arranged between described back light unit and the described frame receiving heat, and described second cooling component extends and is arranged at outside the described display module with heat release from described first cooling component.

19. display device as claimed in claim 17, wherein said cooling unit comprise the part of protruding from described video module, so that hot type is put into outside the described display module.

20. display device as claimed in claim 19 also comprises:

Pore is formed at described one or more covering; And

Fan is arranged between described pore and the described part, and feasible heat from described part is discharged into outside the described display device by described pore.