CN100518479C - Flat-panel display apparatus - Google Patents
Flat-panel display apparatus Download PDFInfo
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- CN100518479C CN100518479C CNB2006101687350A CN200610168735A CN100518479C CN 100518479 C CN100518479 C CN 100518479C CN B2006101687350 A CNB2006101687350 A CN B2006101687350A CN 200610168735 A CN200610168735 A CN 200610168735A CN 100518479 C CN100518479 C CN 100518479C
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Abstract
According to the present invention, the amount of usage of a heat conductive member for fixing a self-luminous flat display panel to a metallic chassis member disposed at the back of the display panel is reduced in the thickness direction as well as in the surface direction. The invention further provides a technique for efficiently radiating heat from the display panel, suppressing cost increase. To this end, in the invention, the heat conductive member is a hot-melt adhesive having adhesion at room temperature and filled with a heat conduction imparting agent, and the display panel is fixed to the chassis member by a plurality of heat conducting sections of the heat conductive member formed discretely ranging from 0.3 to 0.8 mm in thickness.
Description
Technical field
The present invention relates to use the flat display of the plane display floater of the pixel that disposes emissive type between the opposing substrates, particularly relate to the display unit that distributes in the heat of being devoted to make efficiently from display floater.
Background technology
As the plane display floater of emissive type, for example be plasma panel (following province is " PDP " slightly), electronic emission element type display floater, organic EL panel etc.In addition also has LED display floater that for example disposes the LED element etc. two-dimentional shape.
In the display unit of the panel of the emissive type of the display floater that uses these planes etc., be devoted to make efficiently the heating of this panel to distribute.Particularly because the heating of PDP is big, so in the display unit of using PDP, generally, metallic vehicle chassis component (usually as metal be aluminium) is set in the rear side of PDP, by the bonded block with bonding force (bonding force) (heat conductivity parts) with PDP and vehicle chassis component combination.And the heat conduction that will produce in PDP is to vehicle chassis component, for example with fan etc. this heat is dispersed into outside the device.
But, in above-mentioned heat conductivity parts, make the resin combination of propylene system, carbamate system, silicon system etc. be configured as sheet or banded parts usually, will be bonding as the PDP and the vehicle chassis component of display floater.At this moment, between heat conductivity parts and PDP, perhaps have bubble between heat conductivity parts and vehicle chassis component, the adhesiveness of heat conductivity parts and PDP or heat conductivity parts and vehicle chassis component is reduced, heat conductivity reduces.Therefore, for example open and proposed to have the motion that makes the heat exchange sheet of a plurality of grooves that air escapes in the mode that when bonding, does not produce bubble in the 2001-11402 communique the Japan Patent spy.
In addition, reduce entering of above-mentioned bubble, and suppress the purpose that the use amount of heat conductivity parts reduces cost, for example open the 2004-333904 communique and know that further being used to suppress bond area improves circulative repeatedly technology from the Japan Patent spy in order to reach.In this patent gazette, a plurality of thermally conductive adhesives that disclose through forming linearity make the back side of PDP combine with the vehicle chassis component of metallicity (aluminum), pass through above-mentioned adhesive and make the heat conduction that produces in PDP to vehicle chassis component and the technology that distributes.
In addition, need the heat conductivity parts can absorb coefficient of thermal expansion poor of the face glass of PDP and vehicle chassis component.Therefore, for example open put down in writing in the 2002-277185 communique such the Japan Patent spy, usually, the fracture of heat conductivity parts extends in more than 50%.
Summary of the invention
In plasm display device, general, the thickness of heat conductivity parts is generally 1～2mm.This is according to following reason.That is,
(1) when using sheet or band shape as the heat conductivity parts, if its thin thickness, when then carrying out bonding process, the situation of residual bubble is a lot of on certain face of the face glass side of PDP or vehicle chassis component side, becomes the uneven reason of inhomogeneous and bonding force of heat dissipation characteristics.
(2) face glass of PDP is different with the coefficient of thermal expansion of the vehicle chassis component of metallicity (for example aluminium).The difference of this thermal expansion works as cutting off stress for the heat conductivity parts, is sent to face glass and vehicle chassis component both sides' adhesive surface.Because face glass for tensile stress a little less than, so the heat conductivity parts need absorb the poor of coefficient of thermal expansion.
Above-mentioned in order to satisfy (1), (2), the thickness that makes the heat conductivity parts usually are more than 1mm, still because when the deterioration of heat conduction from PDP to the vehicle chassis component when 2mm is above, so will make it below 2mm.
In order further to reduce cost, the thickness of heat conductivity parts is thinned to below the 1mm, but in above-mentioned prior art, not under the circumstances.
In addition, open in the 2004-333904 communique, compare with the situation of adhesive sheet or banded heat conductivity parts the Japan Patent spy, because the liquid heat conductivity parts of primary coating, so operation simply can reach the purpose that reduces cost.Because sky is opened predetermined distance and is applied as oblong-shaped,, just also can reach the purpose that reduces cost in this point again so can reduce the use amount of heat conductivity parts.But, as mentioned above, because if the fracture of heat conductivity parts is extended ε more than 100%, the thickness of heat conductivity parts is thinned to below the 1mm, so can further reduce the use amount of the thickness direction of heat conductivity parts, reach the purpose that reduces cost, but in this patent gazette, also do not speak of this point.
In addition, open in the 2004-333904 communique the Japan Patent spy, do not explain liquid heat conductivity parts, but for example when the resin combination that silicon is or propylene is is dissolved in the organic solvent, during the material of application of liquid shape, needing for example about 20 minutes/60 ℃ drying process in the operation usually.This drying process becomes the main cause that cost is risen.
In addition, when the heat conductivity parts of application of liquid shape, its viscosity (flowability) is key factor.For example in order to ensure the thickness of heat conductivity parts, when making heat conduction well increase the amount of heat conduction imparting agent (being also referred to as the heat conduction charges), viscosity increases, the mobile deterioration.Therefore screening characteristics worsens, and also becomes the main cause that cost is risen again.Preferably make the electrical thin thickness of thermal conductance from this point.But, open the Japan Patent spy and not take into full account screening characteristics in the 2004-333904 communique.
In addition, use the display unit of PDP to require height to become more meticulous and high brightnessization, be accompanied by height and become more meticulous and high brightnessization, may further increase caloric value from PDP.Thereby, at this moment, preferably can dispel the heat more expeditiously than open the technology of putting down in writing in the 2004-333904 communique the Japan Patent spy.
In addition, in order to improve heat conductivity, increase the use amount (promptly increasing the contact area of bonded block and PDP and vehicle chassis component) of above-mentioned adhesive and use the high adhesive of heat conductivity, be not preferred from the angle of cost.
The invention provides the superior flat display of cost behavior.In more detail, the invention provides and simultaneously to suppress the cost one side that rises and distribute technology expeditiously from the heat of display floater.
Feature of the present invention is, the bonded block that is used for display floater and metallicity vehicle chassis component are mutually combined is to be filled with the heat-fusible adhesive that has fusible heat conduction imparting agent at normal temperatures, its thickness is 0.3 to 0.8mm, and disposes a plurality of discretely in the direction of regulation.
According to this formation, can reduce use amount as the heat-fusible adhesive of heat conductivity parts, in addition, because use heat-fusible adhesive as the heat conductivity parts, so can be in the short time laminating flat type display floater and vehicle chassis component, can reach the purpose that reduces cost.
Further, feature of the present invention is, through bonded block display floater and metallic vehicle chassis component are mutually combined with heat conductivity, and in above-mentioned vehicle chassis component, through hole is set, by through hole, make ventilating air in the space that the back side and vehicle chassis component by above-mentioned bonded block, display floater form.
Above-mentioned bonded block is above-mentioned heat-fusible adhesive, for example also can form oblong-shaped.Also can along with the direction of the long side direction quadrature of above-mentioned bonded block on extend and form above-mentioned through hole.
In addition, also in the bonnet that can dispose in the mode with the back side that covers above-mentioned vehicle chassis component the circulation of air hole is set, the through hole through this circulation of air hole and above-mentioned vehicle chassis component carries out the air-breathing and exhaust in above-mentioned space.Further, also can on roughly whole of the back side of above-mentioned display floater, the light-proofness parts be set.
And, can provide the flat display of cost excellent according to the present invention.Further, can carry out the heat radiation of display floater in low-cost high-efficiency ground.
Description of drawings
Fig. 1 is the exploded perspective view that the major part of the plasm display device of expression embodiments of the invention 1 constitutes.
Fig. 2 is the schematic diagram that the rear side that is illustrated in the PDP of embodiments of the invention 1 applies the state of heat conductivity parts bandedly.
Fig. 3 is the schematic diagram of expression to the stretching shearing strength of the viscosity of HM adhesive A.
Fig. 4 is the flow chart of expression bonding process.
Fig. 5 is the schematic diagram of heat conductivity parts of rear side of seeing the PDP of the distortion that is coated in expression embodiments of the invention 1 from the heat conductivity component side.
Fig. 6 is the major part section constitution figure of picture horizontal direction of the plasm display device of present embodiment.
Fig. 7 is the schematic diagram of heat conductivity parts of seeing the rear side of the PDP that is coated in embodiments of the invention 2 from the heat conductivity component side.
Fig. 8 is the schematic diagram of heat conductivity parts of seeing the rear side of the PDP that is coated in embodiments of the invention 3 from the heat conductivity component side.
Fig. 9 is the exploded perspective view that the major part of the plasm display device of expression embodiments of the invention 4 constitutes.
Figure 10 is a sectional view of seeing the tacky state of the PDP of embodiments of the invention 4 and vehicle chassis component from above.
Figure 11 is a sectional view of seeing slot-shaped through hole unit 16 from the side.
Figure 12 is the sectional view of the plasm display device of embodiments of the invention 5.
Figure 13 is the PDP1 of expression in the present embodiment and the flow chart of the bonding process of vehicle chassis component 3.
Embodiment
Below, the execution mode that present invention will be described in detail with reference to the accompanying.In addition, below to use PDP to describe as example as the display unit of the display floater of plane.But, the invention is not restricted to this.For example, also can similarly be applicable to the display unit as display floater such as the LED display floater that uses electronic emission element type display floater, organic EL panel, two-dimentional shape ground to dispose the LED element.In addition, in each figure, represent having on the key element of common function additional identical label,, omit its repeat specification about key element once was described.
Feature of the present invention is the bonded block with heat conductivity (hereinafter referred to as the heat conductivity parts) that display floater and metallicity vehicle chassis component is mutually combined as being used for, use has fusible heat-fusible adhesive (following simple be " HM adhesive ") under normal temperature (about 15 ℃～25 ℃, particularly room temperature is 25 ℃).The HM adhesive is that the thermoplastic resin or the thermoplastic rubber of heat solid shape makes its fusion, is coated on the coated object.And, even if also can keep bonding feature because have cool to room temperature, thus with so-called two sides adhesive tape equally can be by press fit.Because can be in the utmost point short time (several seconds) no solvent ground carry out bondingly, so can shorten coating-bonding process, can reach the purpose that reduces cost.
[embodiment 1]
Fig. 1 is the exploded perspective view that the major part of the plasm display device of expression embodiments of the invention 1 constitutes.
In Fig. 1, the framework of accommodating PDP1 is made of the preceding frame 6 and the metal bonnet 7 that dispose the protecgulum 13 that is made of glass etc. in peristome.For example through heat conductivity parts 8 PDP1 is bonded in the front of the vehicle chassis component 3 that is made of aluminium etc., keeps PDP1, a plurality of circuit substrates 2 that will be used for display driver PDP1 are installed in the back side of vehicle chassis component 3.Heat conductivity parts 8 can be sent to vehicle chassis component 3 with the heat that produces efficiently in PDP1, dispel the heat.On vehicle chassis component 3, with function, distribute the heat that takes place from PDP1, cooling PDP1 as the holding member that keeps above-mentioned PDP1.In addition, the X that circuit substrate 2 comprises the display driver that is used to carry out PDP1 and control thereof keeps substrate 2X, Y and keeps substrate 2Y and power supply board 2P, signal processing substrate 2S etc., a plurality of flexible wiring substrates (not shown) by extend the marginal portion of crossing vehicle chassis component 3 four limits are electrically connected with the electrode lead-out part of drawing in the marginal portion of PDP1 (not shown).
Because plasm display device constitutes as described above, so can arrive vehicle chassis component 3 in PDP1 through the heat conduction that heat conductivity parts 8 will produce efficiently.Vehicle chassis component 3 is dispersed into device inside with this heat, and for example the heat that will distribute with not shown fan is discharged to the framework outside.Can cool off PDP1 efficiently thus.
As heat conductivity parts 8, use in the present embodiment at room temperature to have fusible HM adhesive, by add thermosetting viscosity low have a mobile state (below, be called " molten condition "), be coated on the coated object (being PDP1 here).As the fusion heating-up temperature is 120～180 ℃.The thermal endurance of the resin combination of base material worsens in not shown heat distributor inside when surpassing 180 ℃, and is not preferred.In addition, when below 120 ℃ the time, the viscosity high fluidity worsens.In addition, the constituent about heat conductivity parts 8 will be explained below.
Fig. 2 is the schematic diagram that the rear side that is illustrated in the PDP of embodiment 1 is coated with the state of heat conductivity parts bandedly, the last figure of Fig. 2 paper is a front elevation of seeing the heat conductivity parts of the rear side that is coated in PDP from the heat conductivity component side, and figure below of Fig. 2 paper is its vertical view.
In Fig. 2, heat conductivity parts 8 with predetermined distance W, are applied as the rectangular shape (below, be called " oblong-shaped ") of the band shape with Rack WD parallel with the minor face (picture vertical direction) of PDP along the long side direction (picture horizontal direction) of PDP.Below, each oblong-shaped that applies discretely is called heat conductivity unit 80.
But, as shown in Figure 2, when heat conductivity parts 8 not being arranged on whole of PDP, and when being configured, existing and in the Temperature Distribution of PDP, produce inhomogeneously with predetermined distance W, produce the worry of bright uneven so-called brightness irregularities.Therefore, applicant make coating at interval W be 1,3,5,10,20mm, the thickness t of the heat conductivity parts after making PDP1 and vehicle chassis component 3 bonding is 0.5,1.0mm, the brightness irregularities when measuring complete white demonstration in their combination.In addition, making OBL width W D is 10mm, and the front glass panel of PDP, the thickness of back side face glass are 3mm.Its result is as shown in table 1.
Table 1
In table 1, zero expression brightness irregularities is in 1%, and △ is illustrated in 3%, * being illustrated in more than 3%, thickness, unit at interval are mm.Can observe on the boundary experience of brightness irregularities and be about 2%, if this with next be judged as in the practicality no problem.
As can be seen from Table 1, when thickness is 1.0mm, if brightness irregularities then can not be observed in the interval below 5mm, and when thickness is 0.5mm, if brightness irregularities below 10mm, then can not be observed in the interval.That is,, then can increase coating at interval if make the thickness attenuation of heat conductivity parts.For example, see from table 1, at this moment, when making thickness from 1mm to 0.5mm, can make coating at interval W from 5mm to the 10mm that doubles.That is, when thickness can make during for 0.5mm coating at interval and application width roughly the same, compare with the situation that the heat conductivity parts are arranged on whole, can make its use amount reduce half, can reach the purpose that reduces cost.Certainly, even if because making thickness is that 1mm also can reduce use amount, so can reach the purpose that reduces cost, this is self-evident.
In addition, in temperature cycling test (in the duplicate test of room temperature and 100 ℃), whether bonding test of peeling off takes place, having confirmed does not all have bonding peeling off under above-mentioned any condition.
The following describes constituent as the HM adhesive of heat conductivity parts 8.Can use various material as the HM adhesive, but only represent representational material here.But be not limited thereto.
In the present embodiment, will in the combined polymerization rubber (SIS) of the styrene-isoprene-phenylethene that becomes the caoutchouc elasticity composition, add the material (SEPS) of hydrogen as base material.Here making combined polymerization rubber (SIS) is 30wt%, and hydrogen interpolation resin is 40wt% fully.In addition, making rosin ester as bonding imparting agent is 10wt%, and terpene resin is 10wt%.In addition, make the softening agent and the heat deterioration of giving mobile oil prevent that agent from being 10wt%.To be used as benchmark as the HM adhesive of this constituent.Below, the HM adhesive that will become benchmark for convenience's sake is called the HM adhesive A.
As the combined polymerization rubber constituent, the styrene-ethylene-butadiene-styrene (SEBS) that in addition also have s-B-S (SBS) to be, to add hydrogen in SBS system is etc.They can have various uses in design.In addition, the molecular weight reaction of combined polymerization rubber constituent is on melt viscosity, by anti-creep (creep) power, be coated in the temperature design decision of the device on the coated body.
Temperature, viscosity characteristics as the HM adhesive A of above-mentioned constituent are 170000cps (170Pas) at 120 ℃, are 60000cps (60Pas) (measured value of rotation viscometer) at 140 ℃.
Fig. 3 is the schematic diagram of expression to the stretching shearing strength of the viscosity of HM adhesive A.In Fig. 3, with aluminium-aluminium as coated body, the stretching shearing strength when illustrating bond thickness 40 μ m.In plasma display system, while actually employed, the temperature at the PDP back side in the environment of room temperature (25 ℃) about below 60 ℃.Therefore, be 70 ℃ even if make atmosphere temperature, use 120 ℃ viscosity 170000cps (170Pas) again as viscosity, as seen from Figure 3, stretching shearing strength at this moment also is about 15N/cm in 70 ℃ atmosphere
2(1.5kg/cm
2).The summary weight of 42 type PDP is about 8kg, and when the coating shape that makes the HM adhesive is illustrated in figure 2 as oblong-shaped, but bond area becomes PDP rear side area (about 5000cm
2) roughly half, even if but so also can be roughly anti-live about 3.8 tons heavy burden.
Thereby, even if use the HM adhesive shown in the present embodiment, the 42 type PDP that also can keep, bonding summary weight are about 8kg with full intensity.Here, bond thickness (being the thickness of heat-conduction component) is thick more, and the stretching shearing strength is low more, and about 1/10th when the stretching shearing strength when bond thickness is about 1mm is reduced to bond thickness 40 μ m so also can keep, the weight of bonding about 380kg.Thereby, even if make bond thickness be about 1mm, also can hold 42 type PDP are weakened the boundary of 50 times (380/8=48) approximately and keep, bonding.
In order to give HM adhesive A, for example can use the aluminium nitride (below, the HM adhesive that is filled with the heat conduction imparting agent is called " HM adhesive A L ") that the HM adhesive A of 1kg is added the heat conduction imparting agent of about 100g with heat conductivity.At this moment the pyroconductivity of HM adhesive A L is about 0.4W/mK, and disrumpent feelings stretching at room temperature is about 200%.In addition, can access the pyroconductivity of about 1W/mK by the aluminium nitride that adds about 300g increment.In addition, cooperate magnesium oxide and carbon graphite etc. also can access 1W/mK with 50% weight ratio.
Here, the disrumpent feelings stretching ε of heat conductivity parts 8 is by following formulate.1 expression of following formula can absorb the glass that constitutes the PDP back side and as the disrumpent feelings stretching ε of the thermal expansion rate variance of for example aluminium of the material of vehicle chassis component.
(formula 1) ε 〉=(1/2) * L * (λ
2-λ
1) * Δ T/t
In above-mentioned formula 1, L is the length of heat-conduction component, λ
2Be the coefficient of thermal expansion as the aluminium of vehicle chassis component material, λ
1Be the coefficient of thermal expansion of glass, Δ T is the temperature rising value, and t is the thickness of heat-conduction component.In addition, the thickness t of heat-conduction component is provided by the following formula 2 that above-mentioned formula 1 distortion is obtained.
(formula 2) t 〉=(1/2) * L * (λ
2-λ
1) * Δ T/ ε
For example the thickness of the heat-conduction component when being bonded in 42 type PDP on the vehicle chassis component is as follows.For example, the long limit (size of picture horizontal direction) of setting PDP is L, is 90cm when making L, glass heat expansion rate λ
1Be 8.3 * 10
-6/ ℃, the coefficient of thermal expansion λ of aluminum chassis parts
2Be 22 * 10
-6/ ℃, when temperature rising value Δ T was 75 ℃ (face glass rises to the highest 95 ℃ from normal temperature (25 ℃)), when making disrumpent feelings stretching ε for example be 50%, the thickness t of heat-conduction component obtained t=0.86mm from above-mentioned formula 2.But, when making disrumpent feelings stretching ε for example be 100%, obtain t=0.43mm from formula 2.That is,, also can absorb coefficient of thermal expansion poor of PDP (glass) and vehicle chassis component (aluminium) even if the thickness t of heat-conduction component is 0.43mm.
Like this, if the disrumpent feelings stretching ε of heat conductivity parts more than 100%, then the thickness of heat conductivity parts can be thinned to below the 1mm.That is, if disrumpent feelings stretching ε is more than 100%, then because the applied thickness t of HM adhesive A L can so can reduce the use amount of above-mentioned HM adhesive, can reach the purpose that reduces cost below 0.5mm.In addition,,, then can expeditiously vehicle chassis component be arrived in the heat conduction from PDP, can reduce the stress distortion of PDP if applied thickness is thin even if pyroconductivity is about 0.4W/mK.In addition because applied thickness can be for example from 1mm to 0.5mm below, reduce the pyroconductivity of HM adhesive A L so can not reduce comprehensive heat conduction, promptly reduce the addition that is included in the heat conduction imparting agent among the HM adhesive A L.If reduce the addition of heat conduction imparting agent, then,, can improve screening characteristics so improved flowability because reduced the viscosity of HM adhesive A L.And, if screening characteristics is good, then can shorten the time of working procedure of coating, reduce cost.
In addition, because the disrumpent feelings stretching of the HM adhesive A L of present embodiment is about 200%, obtain the following 0.22mm of being limited to of the applied thickness t of HM adhesive A L from formula 2.But, because coating has become difficulty when thin when the applied thickness of HM adhesive A L is crossed, so preferably more than 0.3mm.In addition, consider that applied thickness t increases the screening characteristics that causes and reduces, the upper limit of the applied thickness t of HM adhesive A L is preferably below 0.8mm.
In addition, because by filling the heat conduction imparting agent, temperature-viscosity characteristics moves to the high viscosity side, so for example when using heat distributor coating HM adhesive A L, need to improve ejection air pressure.But the ejection air is pressed and is pressed in 0.5MPa (5kg/cm as general air
2) below.
Below, the PDP of embodiment 1 and the bonding process of vehicle chassis component are described.Fig. 4 is the flow chart of expression bonding process.In Fig. 4, at first step 1 (below, step is designated as briefly " S "), use heat distributor, with predetermined distance HM adhesive A L is applied as oblong-shaped in the PDP rear side as shown in Figure 2.Not shown heat distributor has a plurality of nozzles, and one side makes nozzle leave the about 2mm in the PDP back side, and one side applies with the nozzle translational speed of regulation.Making OBL width in the present embodiment is 10mm, and coating is spaced apart 10mm, and applied thickness is 0.5mm.Like this,, then can finish by primary coating, can shorten activity time, can reach the purpose that reduces cost if use a plurality of nozzles (not shown).Secondly, one side is aimed at (location) on the PDP that is coated with HM adhesive A L, and one side overlaps vehicle chassis component (S2).And, the heating vehicle chassis component, the temperature that adds pressure surface that preferably makes vehicle chassis component is 60～80 ℃, the pressurization stipulated time, carries out pressurized adhesion (S3).Thereby end bonding process.Because become the elastomeric time short (for example several seconds) to the HM adhesive,, can reach the purpose that reduces cost so can shorten the time of coating-bonding process.In addition, bonding with vehicle chassis component after being coated in HM adhesive A L on the PDP in Fig. 4, but be not limited thereto, also can be after being coated in HM adhesive A L on the vehicle chassis component, bonding with PDP.
As mentioned above,, the time of coating-bonding process can be shortened, the purpose that reduces cost can be reached by using the HM adhesive according to the present invention.In addition, becoming oblong-shaped by make the coating shape with predetermined distance, can reduce the use amount of HM adhesive, is below the 0.5mm by making applied thickness further, can reduce use amount, reaches the purpose that reduces cost.In addition, be below the 0.5mm because make applied thickness, so can improve heat conductivity, reduce the stress distortion of PDP.In addition, by not changing heat conduction, the pack completeness that reduces the heat conduction imparting agent reduces viscosity, and the raising screening characteristics that improves liquidity also can reach the purpose that reduces cost.
In addition, in above-mentioned, with the certain intervals of stipulating the HM adhesive be applied as oblong-shaped, but be not limited thereto.Because when the people watches picture, viewpoint is overlapped with picture central authorities, do not produce brightness irregularities so need look after in picture central authorities.Therefore, little at the picture middle body as shown in Figure 5 by the interval W between the heat transmission unit 80 that makes adjacency, make the uniformity of temperature profile of PDP1, the picture peripheral part that separates from the picture center side along the picture left and right directions, increase W at interval.Certainly, become inhomogeneous in the Temperature Distribution of picture end side PDP1, detect the such interval W of boundary (W=10mm was following when for example applied thickness was 0.5mm) but can implement to make brightness irregularities to become, this is self-evident.
Situation about reducing cost by the applied thickness that reduces the HM adhesive more than has been described, but also will have considered other effect.The following describes other effect, promptly pass through the effect of the unwanted radiation of minimizing of minimizing applied thickness generation.
Fig. 6 is the major part section constitution figure of picture horizontal direction of the plasm display device of present embodiment.In Fig. 6, PDP1 will be formed into right X, Y to keep the back side glass substrate 1B of for example thickness 3mm that the front glass substrate 1A of for example thickness 3mm of electrode (not shown) and formation and X, Y keep the address electrode (not shown) of the electrode quadrature formation that is bonded together across not shown discharge space (highly being about 100 μ m).The circuit substrate 2 that will drive PDP1 through lug boss 9 remains on the rear side of vehicle chassis component 3 (for example thickness is 1.5mm).As circuit substrate 2, be that X, Y keep substrate, power supply board, signal processing substrate etc., X keeps electrode 2X and Y keeps electrode 2Y but only illustrate here.X keeps electrode 2X and is electrically connected with the front glass substrate 1A of PDP1 through flexible wiring substrate 4X, and Y keeps electrode 2Y and passes through flexible wiring substrate 4Y and be electrically connected with the front glass substrate 1A of PDP1.In addition, X, Y keep the ground connection (not shown) of electrode 2X, 2Y, and lug boss 9ax, the 9ay through conductivity is connected with the chassis respectively.In addition, lug boss 9ax, 9ay are not connected with the earthed circuit (not shown) that X, Y keep substrate 2X, 2Y.
Thereby, for example when X keeps substrate 2X side drive PDP1, keep discharging current and keep substrate 2X → flexible wiring substrate 4X → PDP1 → flexible wiring substrate 4Y → Y by X and keep substrate 2Y → lug boss 9ay → vehicle chassis component 3 → lug boss 9ax → X and keep the loop flow of substrate 2X in during keeping discharge (sustain discharge).At this moment, the electric current 101 that flows through PDP1 flows along the direction of arrow 111, and the electric current 102 that flows through vehicle chassis component 3 flows along the direction of the arrow 112 opposite with arrow 111.That is, flow through the electric current 101 of PDP1 and to flow through electric current 102 directions of vehicle chassis component 3 opposite.Thereby, cancel out each other by the electromagenetic wave radiation of electric current 101 generations of flowing through PDP1 with by the electromagenetic wave radiation that the electric current 102 that flows through vehicle chassis component 3 produces, reduced unwanted electromagenetic wave radiation from plasm display device.The area that is formed by the ring of above-mentioned current loop is more little, and promptly the distance of the thickness direction between PDP1 and the vehicle chassis component 3 is more little, and this unwanted electromagenetic wave radiation reduces manyly more.
Considering that not shown X, Y from PDP1 keep electrode under the situation apart from TL of the thickness direction of vehicle chassis component, when the thickness of heat-conduction component 8 was 1mm, TL roughly became about the thickness 1mm=4mm of thickness 3mm+ heat-conduction component 8 of back side glass substrate.In addition, when the thickness of heat-conduction component 8 was 0.5mm, TL became about 3.5mm.That is, can reduce unwanted radiation with the amount of the thickness that reduces heat-conduction component 8 from plasm display device.
Further, if be filled with metallic copper particle for example as the heat conduction imparting agent of heat-conduction component 8 with conductivity, then can make heat-conduction component 8 self hold conductivity, can further reduce unwanted radiation from plasm display device.
[embodiment 2]
In embodiment 1, heat conductivity parts (HM adhesive) are applied as the oblong-shaped of Rack along the long side direction (picture horizontal direction) of PDP with predetermined distance, but the invention is not restricted to this.
Fig. 7 is the schematic diagram of heat conductivity parts of seeing the rear side of the PDP that is coated in embodiment 2 from the heat conductivity component side.
In Fig. 7, with heat conductivity parts 8 along the long side direction (picture horizontal direction) of PDP with predetermined distance W, be applied as and have and the rectangular shape of minor face (picture vertical direction) parallel ribbon of PDP (below, be called " oblong-shaped ").But, different with embodiment 1 in the present embodiment, apply discretely with the predetermined distance WV that in short side direction (picture vertical direction), also do not produce brightness irregularities (when for example applied thickness is 0.5mm below the WV=10mm).Below, each part that applied discretely is called heat-conduction part 81.
According to present embodiment,,, can reach the purpose that reduces cost so can further reduce the use amount of heat conductivity parts because not only apply heat transmission unit 81 with predetermined distance at long side direction but also at short side direction.
[embodiment 3]
The following describes embodiments of the invention 3.Fig. 8 is the schematic diagram of heat conductivity parts of seeing the rear side of the PDP that is coated in embodiment 3 from the heat conductivity component side.
In embodiment 1, heat conductivity parts (HM adhesive) are applied as the oblong-shaped of Rack with predetermined distance along the long side direction (picture horizontal direction) of PDP, but in the present embodiment, as shown in Figure 8, make the width W D of OBL heat conductivity portion 82 big in the picture center side, little in the picture end side.
As described above,, viewpoint is overlapped with picture central authorities, do not produce brightness irregularities so need look after in picture central authorities because when the people watches picture.Therefore, by making the width W D of OBL heat-conduction part 82 big, make the uniformity of temperature profile of PDP1 at the picture middle body.And, the picture periphery that separates from the picture center side along the picture left and right directions, reduce the width W D of heat-conduction part 82.Certainly, Temperature Distribution at picture end side PDP1 becomes inhomogeneous, but the width W D that can implement to make brightness irregularities to become to detect the such heat-conduction part 82 of boundary (for example applied thickness is 0.5mm, at interval during W=10mm more than the WD=10mm), this is self-evident.
Even if in the present embodiment, to compare with embodiment 1, it is little that the use amount of heat conductivity parts reduces effect, but by reducing applied thickness (for example being 0.5mm), also can reduce the use amount of heat conductivity parts, can reach the purpose that reduces cost.
In addition, in addition,, also the embodiment of present embodiment and Fig. 5 can be used in combination though do not illustrate.That is,, reduce W at interval, the Temperature Distribution of PDP is become uniformly, make brightness irregularities littler at the width W D of picture central portion side increase heat-conduction part.In addition,, reduce the width W D of heat-conduction part, increase W at interval in the picture end side.Certainly, the width W D that can implement to make brightness irregularities to become to detect the such heat-conduction part of boundary in the picture end side, W at interval, this is self-evident.And can pass through the foregoing description 1～embodiment 3 combination in any and enforcement, this is self-evident.
[embodiment 4]
The following describes embodiments of the invention 4.In addition, below, be that example describes with the display unit that PDP is used as the plane display floater.
Fig. 9 is the exploded perspective view that the major part of the plasm display device of expression embodiments of the invention 4 constitutes.In Fig. 9, the framework of accommodating PDP1 is made of preceding frame 6 and the metal bonnet 7 that the protecgulum 13 that will have glass etc. is configured on the peristome.Through heat conductivity parts 8 PDP1 is bonded in the front of the vehicle chassis component 3 that is made of for example aluminium etc., keeps PDP1 thus, a plurality of circuit substrates 2 that will be used for display driver PDP1 are installed in the back side of vehicle chassis component 3.On roughly whole of the PDP1 back side, light-proofness parts (not shown) are applied as film like.Heat conductivity parts 8 are for the heat that will take place in PDP1 efficiently is sent to the parts that vehicle chassis component 3 dispels the heat, as shown in the figure, with the short side direction almost parallel of PDP1 be configured to band shape.Vehicle chassis component 3 has the function as the holding member that keeps above-mentioned PDP1, and has the heat of distributing from the PDP1 generation, the function of cooling PDP1.In addition, in vehicle chassis component 3, be provided with a plurality of banded through holes 16 as shown in figure.Explain the function of these banded through holes 16 in the back.In addition, circuit substrate 2 X that comprises the display driver that is used to carry out PDP1 and control thereof keeps substrate 2X, Y and keeps substrate 2Y and power supply board 2P, signal processing substrate 2S etc.And by (not shown) such as mounting screws being screwed into the lug boss 14 that is arranged in the vehicle chassis component 3 and cutting out these circuit substrates of fixed configurations in the portion 15.In addition, a plurality of flexible wiring substrates (not shown) by extend the electrode lead-out part (not shown) of drawing in the end of PDP1 and the end of crossing vehicle chassis component 3 four limits are electrically connected these circuit substrates 2 get up.As heat conductivity parts 8, use the HM adhesive that in embodiment 1 grade, illustrates in the present embodiment.
The plasm display device of present embodiment is because constitute as described above, so can arrive vehicle chassis component 3 through the heat conduction that heat conductivity parts 8 will produce efficiently in PDP1.Vehicle chassis component 3 is dispersed into device inside with this heat, for example uses not shown fan that this heat of distributing is discharged to the framework outside.Can cool off PDP1 expeditiously thus.
Figure 10 is a sectional view of seeing the tacky state of the PDP1 of embodiment 1 and vehicle chassis component 3 from above.In Figure 10, on roughly whole of the rear side of PDP1, be coated with light-proofness parts 17.In addition, in vehicle chassis component 3, be provided with a plurality of slot-shaped through holes 16 as described above.
In Figure 10, make heat conductivity parts 8 form the band shape with Rack WD of extending along the direction parallel with the minor face (picture vertical direction) of PDP.Below, the shape of the heat conductivity parts 8 that this is banded is called " oblong-shaped ".In addition, along arranging heat conductivity parts 8 with predetermined distance W with long limit (picture horizontal direction) direction of PDP.That is, dispose heat conductivity parts 8 discretely along long side direction with PDP.
Describe light-proofness parts 17 now in detail.Light-proofness parts 17 for example use reactive (Reaction type) hotmelt (hereinafter referred to as the R-HM adhesive), room temperature vulcanizing type silicon rubber (liquid type RTV rubber for example: etc. the three-dimensional bridge formation section bar material formation silicon system KE-3467 of SHIN-ETSU HANTOTAI).Because for example in Japanese patent laid-open 8-259923 communique, record the details of above-mentioned R-HM adhesive, please refer to this patent gazette.As three-dimensional bridge formation section bar material, in addition also have photo-hardening type, epoxy cure type etc., but, be preferred so use R-HM adhesive and room temperature vulcanizing type silicon rubber because cost is high and curing system price height.In the present embodiment, adopting the reason of three-dimensional bridge formation body is because sclerosis back (although having some softening) almost do not have temperature flowing.Promptly, if use three-dimensional bridge formation body as light-proofness parts 17, then have the effect that can reduce the deformation of creep that causes by the heat that in PDP1, produces, can adjust shading characteristic and thermal conduction characteristic by the blending agents that in these materials, adds aluminium oxide, talcum, magnesium hydroxide, carbon black etc.In the present embodiment, the transmitance of light-proofness parts 17 is being preferred below 20%.
The coating method of this adhesive when using the R-HM adhesives as above-mentioned light-proofness parts 17 is described here.At first, use not shown smelt dissolver, it is transported to thermic lance with liquid-feeding pump at about 120 ℃ of dissolving R-HM adhesives.Secondly around the nozzle of thermic lance, dispose the nozzle of a plurality of air ejection usefulness, be accompanied by air and the R-HM adhesive is blown be attached on the PDP1.Blowing attached R-HM adhesive roughly hardens in the several seconds.(thermojet method)
In the present embodiment, the thickness of setting the R-HM adhesive is 10～40 μ m, preferably about 30 μ m.When the carbon black of 10wt% was advanced in blending in the R-HM adhesive, the light penetration when about 30 μ m can access desired shading characteristic function below 10%.If can access desired shading characteristic, then also it doesn't matter more than above-mentioned thickness for the thickness of R-HM adhesive, but from heat conduction and cost aspect thin thickness more preferably.
One liquid type RTV rubber can be (non-heating) spraying coating too, is a difficult point but firm time reaches several minutes.But because KE-3467 is a leucoplast, pyroconductivity also is about 2W/mK, so also can replace the R-HM adhesive to use a liquid type RTV rubber.
The following describes the slot-shaped through hole 16 that is arranged in the vehicle chassis component 3.Figure 11 is a sectional view of seeing slot-shaped through hole portion from the side.As shown in figure 11, be configured to OBL heat conductivity parts 8 and in the space 18 that forms by the PDP1 back side and metal vehicle chassis component 3, convection current taking place, because this convection current makes the PDP1 cooling.When not having slot-shaped through hole 16, suck the air in the space 18 from the PDP1 bottom, absorb the heat that PDP1 produces temperature is risen, convection current takes place.So to the upper end, air themperature all the more rises more, caloric receptivity reduces (heat dispersion reduces more) more.When being provided with slot-shaped through hole 16, the portion of air that can discharge in the spaces 18 from slot-shaped through hole 16 as shown in the figure, and extraneous air is taken in the space 18.That is, through being arranged on the through hole 16 in the vehicle chassis component 3, can ventilating air between the rear side of vehicle chassis component 3 and the space 18.Because the air themperatures in the space 18 rise as described above, the temperature of the air that is taken into from slot-shaped through hole 16 is low, so can be from the air themperature of slot-shaped through hole 16 in top reduces space 18.Thereby, because can absorb heat, so the result can make the temperature of PDP1 further descend with the amount of air themperature decline from PDP1.In addition, even if in heat conductivity parts 8, when with the heat conduction of PDP1 during to vehicle chassis component 3, with face that space 18 is connected on also owing to the air in the space 18 cools off.Therefore, even if in the part of joining with heat conductivity parts 8 of PDP1, temperature is descended.
For example as shown in Figure 9, the edge forms slot-shaped through hole 16 with the direction of the horizontal direction parallel of PDP1, forms rectangular shape.That is the long side direction quadrature of the heat conductivity parts 8 of the long side direction of the slot-shaped through hole 16 of rectangular shape and the same rectangular shape of formation.Thereby in 1 slot-shaped through hole 16, circulation has the air in a plurality of spaces 18.In addition, as shown in Figure 9, slot-shaped through hole 16 is arranged along the horizontal direction carreau shape ground of PDP1.Further, as shown in Figure 9, also can be at the row that the slot-shaped through hole of arranging on above-mentioned carreau shape ground 16 is set respectively up and down of vehicle chassis component 3.In addition, as an example, the shape of above-mentioned slot-shaped through hole 16 and arrangement also can form shape and arrangement in addition, and this is self-evident.
Like this, in the present embodiment, by slot-shaped through hole 16 is set, the air circulation that has improved space 18 can improve heat dispersion.Promptly, heating can be distributed efficiently, the temperature of PDP1 can be reduced well from PDP1 according to present embodiment.
Below, with reference to Figure 13 the PDP1 of embodiment 4 and the bonding process of vehicle chassis component 3 are described.Figure 13 is the flow chart of an example of bonding process of the PDP1 vehicle chassis component 3 of expression embodiment 4.In Figure 13, at first step 1 (below, step is designated as briefly " S "), use thermic lance, the R-HM adhesive is coated on roughly whole of rear side of PDP1.Secondly, in operation 2, utilize heat distributor, the rear side at PDP1 is applied as oblong-shaped with predetermined distance with HM adhesive A L as shown in Figure 2.Not shown heat distributor has a plurality of nozzles, and one side makes nozzle leave the about 2mm in the PDP back side, and one side applies with the nozzle translational speed of regulation.Like this,, then can finish by primary coating, can shorten activity time, can reach the purpose that reduces cost if use a plurality of nozzles (not shown).Then, one side is aimed at (location) on the PDP1 that is coated with HM adhesive A L, and one side overlaps vehicle chassis component 3 (S3).And, heating vehicle chassis component 3, the temperature that adds pressure surface that preferably makes vehicle chassis component 3 is 60～80 ℃, the pressurization stipulated time, carries out pressurized adhesion (S4).Thereby end bonding process.Because become the elastomeric time short (for example several seconds) to the HM adhesive,, can reach the purpose that reduces cost so can shorten the time of coating-bonding process.In addition, bonding with vehicle chassis component 3 after being coated in HM adhesive A L on the PDP1 in Figure 13, but be not limited thereto, for example, and also can be after being coated in HM adhesive A L on the vehicle chassis component 3, bonding with PDP1.
[embodiment 5]
Figure 12 is the sectional view of the plasm display device of embodiments of the invention 5.In the present embodiment, dispose bonnet 7, extraneous gas is set in this bonnet 7 is taken into hole 7a and steam vent 7b in the mode that covers the vehicle chassis component 3 and the PDP1 back side.In addition, support 20 is the parts that are used for supporting from the below whole plasm display device.In addition, by installing, circuit substrate shown in Figure 12 is fixed on the vehicle chassis component with protruding part 14 and mounting screw 19.And in the present embodiment,, be taken into hole 7a through extraneous gas air (extraneous gas) is taken into the inside of auto levelizer, by this air cooling vehicle chassis component 3 and circuit substrate 2 etc. by not shown fan.And be discharged to the device outside through the air that steam vent 7b will cool off each several part.Usually consider the convection current of air, extraneous gas is taken into the downside that hole 7a is arranged on device, steam vent 7b is arranged on the upside of device.Certainly, also can be configured in contrast.
And in the present embodiment, the extraneous gas from be arranged on bonnet 7 is taken into 7a and flows into air, and this air flow into above-mentioned space 18 through slot-shaped through hole 16.And will in space 18, cool off PDP1 etc. and the air that overheats, and be released to the outside of vehicle chassis component 3 through slot-shaped through hole 16, further this air is discharged to the device outside through steam vent 7b.Therefore, according to present embodiment, because can expeditiously extraneous gas be imported to space 18, so can cool off PDP1 more efficiently than embodiment 1.Resolve the flow velocity of trying to achieve the air that flows through above-mentioned space 18 (gap of adhesive) by hot fluid, only be about 200mm/sec, but the convection current that can confirm in above-mentioned space 18, to produce air.
In addition, in the present embodiment, as shown in figure 12, be taken into hole 7a and steam vent 7b enters extraneous light from the extraneous gas of plasm display device.This is the illumination light that is provided with the room of plasm display device, and this illumination light is the light of reflection on the wall that is positioned at the device back side etc. and from the light as the lighting apparatus that is arranged on the device rear side of interior decoration etc.Be taken into light that hole 7a, steam vent 7b enter by slot-shaped through hole 16 (arrow A the figure, B) from extraneous gas.But,, the exterior light of the inside that arrives PDP1 is decayed significantly because be coated with light-proofness parts 17 as mentioned above all sidedly at the back side of PDP1.So, can prevent from display frame, to form peculiar light.
As previously discussed, according to present embodiment,, in the plasm display device of the formation that is bonded with PDP1 and vehicle chassis component 3, can improve radiating efficiency because in vehicle chassis component 3, be provided with a plurality of through holes.And in the present embodiment, use heat-fusible adhesive as the heat conductivity parts, again because can reduce use amount, so the display floater of laminating flat type and vehicle chassis component at short notice can reach the purpose that reduces cost as the heat-fusible adhesive of heat conductivity parts.Further, time of coating-bonding process can be shortened as the heat conductivity parts, the purpose that reduces cost can be reached by using the HM adhesive.Further, by make the coating shape become the use amount that oblong-shaped can reduce the HM adhesive with predetermined distance.
Claims (5)
1. a flat display is characterized in that, comprising:
Display floater, metallicity vehicle chassis component and be used for the bonded block that the back side and described vehicle chassis component with this display floater mutually combine,
Wherein said bonded block is to be filled with the heat-fusible adhesive that has fusible heat conduction imparting agent at normal temperatures, and its thickness is 0.3 to 0.8mm, and disposes a plurality of discretely in the direction of regulation.
2. flat display according to claim 1 is characterized in that:
The shape of described bonded block is banded.
3. flat display according to claim 2 is characterized in that:
With the bonded block of described band shape with the arranged spaced of regulation picture long side direction at described display floater, and with the picture short side direction almost parallel of described display floater,
For the interval of described regulation, compare with the picture central portion of described display floater, big at the periphery that leaves the picture left and right directions from this picture central portion.
4. flat display according to claim 2 is characterized in that:
With the bonded block of described band shape with the arranged spaced of regulation picture long side direction at described display floater, and with the picture short side direction almost parallel of described display floater,
For the width of described bonded block, compare with the picture central portion of described display floater, little at the periphery that leaves on the picture left and right directions from this picture central portion.
5. flat display according to claim 1 is characterized in that:
Described display floater is a plasma display.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005364215 | 2005-12-19 | ||
| JP2005364215A JP4929702B2 (en) | 2005-12-19 | 2005-12-19 | Flat panel display |
| JP2006068468 | 2006-03-14 |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101308409A Division CN101533586A (en) | 2005-12-19 | 2006-12-19 | Flat-panel display apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1988790A CN1988790A (en) | 2007-06-27 |
| CN100518479C true CN100518479C (en) | 2009-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101308409A Pending CN101533586A (en) | 2005-12-19 | 2006-12-19 | Flat-panel display apparatus |
| CNB2006101687350A Expired - Fee Related CN100518479C (en) | 2005-12-19 | 2006-12-19 | Flat-panel display apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009101308409A Pending CN101533586A (en) | 2005-12-19 | 2006-12-19 | Flat-panel display apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4929702B2 (en) |
| CN (2) | CN101533586A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012176421A1 (en) * | 2011-06-22 | 2012-12-27 | パナソニック株式会社 | Plasma display device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3793614B2 (en) * | 1997-01-06 | 2006-07-05 | 株式会社日立製作所 | Plasma display panel |
| JP2001236022A (en) * | 2000-02-22 | 2001-08-31 | Matsushita Electric Ind Co Ltd | Video display device |
| JP2003223114A (en) * | 2002-01-31 | 2003-08-08 | Tokai Rubber Ind Ltd | Plasma display panel |
| JP2004347741A (en) * | 2003-05-21 | 2004-12-09 | Bando Chem Ind Ltd | Strip-like heat radiation sheet |
| JP4551633B2 (en) * | 2003-07-02 | 2010-09-29 | パナソニック株式会社 | Flat panel display |
-
2005
- 2005-12-19 JP JP2005364215A patent/JP4929702B2/en not_active Expired - Fee Related
-
2006
- 2006-12-19 CN CNA2009101308409A patent/CN101533586A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN1988790A (en) | 2007-06-27 |
| JP2007171224A (en) | 2007-07-05 |
| JP4929702B2 (en) | 2012-05-09 |
| CN101533586A (en) | 2009-09-16 |
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