CN202206702U - Gradient composite heat-conducting strip - Google Patents
Gradient composite heat-conducting strip Download PDFInfo
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- CN202206702U CN202206702U CN2011202814576U CN201120281457U CN202206702U CN 202206702 U CN202206702 U CN 202206702U CN 2011202814576 U CN2011202814576 U CN 2011202814576U CN 201120281457 U CN201120281457 U CN 201120281457U CN 202206702 U CN202206702 U CN 202206702U
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Abstract
The utility model provides a gradient composite heat-conducting strip, which is mainly used for solving the problems of the existing heat dissipation structure, such as low heat dissipation efficiency and worse heat-conducting uniformity. The gradient composite heat-conducting strip is arranged on the surface of a heat source; a heat dissipation adhesive layer is arranged on the contact surface between the heat-conducting strip and the heat source; and the longitudinal heat conductivity of the heat dissipation adhesive layer shows a gradient distribution mode in the surface. The gradient composite heat-conducting strip with the longitudinal heat conductivity in the gradient distribution mode is formed in consideration of non-uniformity of a heat dissipation environment, and has the beneficial effects of further enhancing the temperature uniformity of a large-area display screen, improving the display effect of the display screen and prolonging the service life of the display screen.
Description
Technical field
The utility model relates to a kind of conducting strip, is specifically related to a kind of gradient composite heat-conducting fin, belongs to the flat plate radiation composite material, is mainly used in the heat radiation of large-sized panel display device.
Background technology
The thermal diffusivity of large-sized panel display device is the key factor that influences picture quality and display life.
In plasma panel (PDP), each gas discharge unit just is equivalent to a thermal source, and the heat of generation is a lot, if untimely the distributing of heat and whole screen temperature is raise caused many adverse consequencess.
Because screen intensity becomes positive correlation with temperature, but screen temperature height can cause contrast to descend.In plasma panel PDP, the regional luminance that activates discharge is high, and temperature is also high; The regional luminance that does not discharge is low, and temperature is also low.Screen picture be at any time, transient change.When the clear zone in a certain moment when next constantly will become the dark space, if the temperature in this district can not reduce rapidly, just can not become required low brightness area at once; Otherwise,, just can not become required high-brightness region rapidly if original temperature dark space temperature on the low side can not raise rapidly.
If large-sized panel display device non-uniform temperature everywhere, the zone that zone that temperature is high and temperature are low can produce thermal stress, and the big more thermal stress of the temperature difference is big more, and this thermal stress is prone to cause screen to break.This non-uniform temperature is exactly the main cause that the PDP screen breaks.
United States Patent (USP) (USP5,831,374) and Chinese patent (CN100401865C) disclose a kind of with the Heat Conduction Material of flexible graphite platelet as ion display screen PDP interface, and it utilizes, and the high characteristic of thermal conductivity keeps evenly the temperature of display in the graphite face.Because the stickiness on flexible graphite platelet and large-sized panel display device surface is relatively poor, the bubble of the two can not be discharged to greatest extent, so the radiating efficiency of display is still lower.
Though use anisotropic graphite can to a certain degree improve the display screen surface temperature homogeneity; But because screen is increasing now; Heat dissipation environment itself is inhomogeneous everywhere for conducting strip in addition, so use whole heat eliminating medium with uniformity thermal conductivity can't solve the problem of temperature homogeneity well.In fact often very fast in some edge heat radiation of display screen, and middle body or the heat radiation of other edges are slower.
Summary of the invention
The utility model provides a kind of gradient composite heat-conducting fin, has mainly solved the problem that existing radiator structure radiating efficiency is low, the heat conduction uniformity is relatively poor.
The concrete technic relization scheme of the utility model is following:
This gradient composite heat-conducting fin, conducting strip are arranged on the surface of thermal source, and the contact-making surface of conducting strip and thermal source is provided with the heat radiation glue-line, vertical thermal conductivity distribution gradient in face of heat radiation glue-line; The direction that vertically is perpendicular to the thermal source surface described herein.
Above-mentioned heat radiation glue-line generally is to be coated on the contact-making surface on conducting strip and thermal source surface its thermal conductivity distribution gradient in face.The Gradient distribution size of thermal conductivity and form are to confirm according to the size and the Aspect Ratio of thermal source.
Above-mentioned composite heat-conducting fin comprises two-layer at least unit conducting strip, is provided with the heat radiation glue-line on each layer unit conducting strip, constitutes composite heat-conducting fin through pressure between each layer unit conducting strip and the heat radiation glue-line.
The said units conducting strip is graphite flake and/or tinsel, when selecting graphite flake and tinsel to use simultaneously, graphite flake and tinsel is alternately distributed.
The advantage of the utility model is:
The gradient composite heat-conducting fin that the utility model provides; It is composite heat-conducting fin in vertical thermal conductivity Gradient distribution of considering to form on the heat dissipation environment inhomogeneities basis; Further improved the temperature homogeneity of large tracts of land display screen, improved its display effect, increased the service life.
Description of drawings
Fig. 1 is the structural representation of the utility model;
Fig. 2 is another structural representation of the utility model;
Fig. 3 is another structural representation of the utility model.
Embodiment
Thermal conductivity and temperature distribution evenness are the key factors that influences large-sized panel display device picture quality and life-span.If Heat Conduction Material can transmit large-sized panel display device heat everywhere rapidly in its face along screen; Then the screen temperature can be kept evenly; And at this moment, each regional brightness of screen only is decided by the control of the signal of telecommunication, and the screen display effect can reach perfect condition.Be called " vertically thermal conductivity " perpendicular to the thermal conductivity on the radiating surface direction, the thermal conductivity in the fin plane is called " thermal conductivity in the face ".
Like Fig. 1, Fig. 2, shown in Figure 3: this gradient composite heat-conducting fin, conducting strip are arranged on the surface of thermal source, and the contact-making surface of conducting strip and thermal source is provided with the heat radiation glue-line, thermal conductivity distribution gradient in face of heat radiation glue-line; The described direction that vertically is perpendicular to the thermal source surface in this place.
The heat radiation glue-line generally is to be coated on the surperficial contact-making surface of conducting strip and thermal source its thermal conductivity distribution gradient in face.The Gradient distribution size of thermal conductivity and form are to confirm according to the size and the Aspect Ratio of thermal source.
Composite heat-conducting fin should comprise two-layer at least unit conducting strip, is provided with the heat radiation glue-line on each layer unit conducting strip, constitutes composite heat-conducting fin through pressure between each layer unit conducting strip and the heat radiation glue-line; The unit conducting strip generally is graphite flake and/or tinsel, when selecting graphite flake and tinsel to use simultaneously, graphite flake and tinsel is alternately distributed.
The utility model all is superior to prior art through the experiment test impact of performance.Thermal conductivity is measured with steady state method among the embodiment, and display screen temperature distributes and measures with thermal infrared imager.
Embodiment 1:
Be mixed and made into coating with 20g, 35g, 50g boron nitride powder (sheet, average diameter 1.0 μ m) respectively by 100g hot setting silicon rubber, it is thick to be applied to 20 μ m according to 2: 1: 3 area ratios, 1000 * 600mm
2Aluminium foil (like Fig. 1), the material that contains 20gBN is applied to the outermost annular region, the material that contains 35gBN is applied to intermediate annular region, the material that contains 50gBN is applied to the intermediate rectangular zone.Bondline thickness is 5 microns.At this glue-line other one deck aluminium foil of fitting, aluminium foil surface applies glue-line according to above-mentioned distribution again, stack so repeatedly, and the aluminium foil number of plies finally is 8 layers, outermost layer applies glue-line.This composite heat-conducting section bar is clipped in the middle of glass screen and the aluminium matter heat-radiating substrate, and the display screen operation of under 25 ℃ of room temperatures, switch on reaches after the stable state with the distribution of thermal infrared imager mensuration display screen temperature.。
Embodiment 2:
Be mixed and made into coating with 20g, 30g, 40g, 60g boron nitride powder (sheet, average diameter 1.0 μ m) respectively by 100g hot setting silicon rubber, according to 5: 3: 2: it is thick that 1 area ratio is applied to 20 μ m, 1000 * 600mm
2Aluminium foil (like Fig. 2), the material that contains 20gBN is applied to the outermost annular region, the material that contains 30gBN is applied to intermediate annular region, the material that contains 60gBN is applied to the intermediate rectangular zone.Bondline thickness is 5 microns.At this glue-line other one deck aluminium foil of fitting, aluminium foil surface applies glue-line according to above-mentioned distribution again, stack so repeatedly, and the aluminium foil number of plies finally is 10 layers, outermost layer applies glue-line.This composite heat-conducting section bar is clipped in the middle of glass screen and the aluminium matter heat-radiating substrate, and the display screen operation of under 25 ℃ of room temperatures, switch on reaches after the stable state with the distribution of thermal infrared imager mensuration display screen temperature.
Comparative example:
Be mixed and made into coating with 35g boron nitride powder (sheet, average diameter 1.0 μ m) respectively by 100g hot setting silicon rubber, it is thick evenly to be applied to 20 μ m, 1000 * 600mm
2Aluminium foil, at this glue-line other one deck aluminium foil of fitting, aluminium foil surface applies glue-line according to above-mentioned distribution again, bondline thickness is 5 microns.Stack so repeatedly, the aluminium foil number of plies finally is 10 layers, outermost layer applies glue-line.This composite heat-conducting section bar is clipped in the middle of glass screen and the aluminium matter heat-radiating substrate, and the display screen operation of under 25 ℃ of room temperatures, switch on reaches after the stable state with the distribution of thermal infrared imager mensuration display screen temperature.
| Test event | Embodiment 1 | Embodiment 2 | Comparative example |
| Maximum temperature/℃ | ?52.9 | ?53.8 | 52.8 |
| Minimum temperature/℃ | ?42.7 | ?44.7 | 39.6 |
| Temperature difference/℃ | ?10.2 | ?9.1 | 13.2 |
Prior art generally is that the flaky material that aluminium foil and two kinds of thermal conductivitys of glue differ greatly is superimposed; The two thermal conductivity is isotropic; Be that vertical thermal conductivity is with laterally thermal conductivity is identical; Can make composite material vertical thermal conductivity on the whole and horizontal thermal conductivity become inequality behind the process multiple-level stack, thereby produce anisotropy, but the vertical thermal conductivity in its integral material face is identical everywhere.
The zones of different coated with thermally conductive rate of the utility model on the aluminium foil of high heat conduction is different, and the heat radiation glue-line of distribution gradient, makes vertical thermal conductivity distribution gradient in face of integral material, and promptly the vertical thermal conductivity of zones of different is different in the face; This mode has further improved the temperature homogeneity of large tracts of land display screen, eliminates thermal stress, improves its display effect, increases the service life.
Claims (6)
1. gradient composite heat-conducting fin, said conducting strip is arranged on the surface of thermal source, it is characterized in that: the contact-making surface of said composite heat-conducting fin and thermal source is provided with the heat radiation glue-line, vertical thermal conductivity distribution gradient in face of heat radiation glue-line.
2. gradient composite heat-conducting fin according to claim 1 is characterized in that: said heat radiation glue-line is to be coated on the contact-making surface of conducting strip and thermal source, its thermal conductivity distribution gradient in face.
3. gradient composite heat-conducting fin according to claim 2 is characterized in that: said conducting strip is graphite or metal forming; The Gradient distribution size of said vertical thermal conductivity and form are to confirm according to the surface size and the Aspect Ratio of thermal source.
4. gradient composite heat-conducting fin according to claim 3; It is characterized in that: said conducting strip comprises two-layer at least unit conducting strip; Be provided with the heat radiation glue-line on each layer unit conducting strip, constitute composite heat-conducting fin through pressure between each layer unit conducting strip and the heat radiation glue-line.
5. gradient composite heat-conducting fin according to claim 4 is characterized in that: said unit conducting strip is graphite and metal forming, and graphite and metal forming alternately distribute.
6. gradient composite heat-conducting fin according to claim 4 is characterized in that: said unit conducting strip is graphite or metal forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202814576U CN202206702U (en) | 2011-08-04 | 2011-08-04 | Gradient composite heat-conducting strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202814576U CN202206702U (en) | 2011-08-04 | 2011-08-04 | Gradient composite heat-conducting strip |
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| Publication Number | Publication Date |
|---|---|
| CN202206702U true CN202206702U (en) | 2012-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202814576U Expired - Fee Related CN202206702U (en) | 2011-08-04 | 2011-08-04 | Gradient composite heat-conducting strip |
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| CN (1) | CN202206702U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259164A (en) * | 2013-05-09 | 2013-08-21 | 成都微深科技有限公司 | Cooling device for laser reflector |
-
2011
- 2011-08-04 CN CN2011202814576U patent/CN202206702U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259164A (en) * | 2013-05-09 | 2013-08-21 | 成都微深科技有限公司 | Cooling device for laser reflector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120425 Termination date: 20140804 |
|
| EXPY | Termination of patent right or utility model |