CN102654282A - Light emitting device with moisture absorption structure - Google Patents

Abstract

The invention provides a light-emitting device with a moisture absorption structure, which comprises a base; a plurality of light emitting diodes disposed on the base, wherein the light emitting diodes are spaced apart from each other by a space; and a moisture absorption layer disposed on the base and between the light emitting diodes. The invention absorbs moisture in the light-emitting device by the design of the moisture absorption layer, so as to reduce the fraction defective of the light-emitting device and prolong the service life of the light-emitting device.

Description

Light emitting device with hygroscopic structure

technical field

The invention relates to a light-emitting device, and in particular to a light-emitting device with a hygroscopic structure.

Background technique

Light emitting diodes (light emitting diodes, LEDs) have been widely used in lighting devices, such as flashlights, car headlights, light bulbs, and lamp tubes, due to the advantages of long service life, power saving, and high brightness.

A general LED lamp has a base, a light-emitting diode fixed in the base, and a lampshade covering the light-emitting diode. However, when the luminaire is installed indoors or even outdoors, moisture can easily seep into the luminaire, thereby affecting the service life, efficiency, color temperature and color properties of the LED.

The existing LED lamp encapsulation process (encapsulation process) mainly uses a sealant to bond the lampshade to the base, and then seals a dry inert gas in the hollow part to prevent the moisture in the external environment from entering. However, even if the sealant is used Still can't completely block the entry of moisture.

Therefore, the industry urgently needs to provide a light-emitting device with a moisture-absorbing structure to maintain the service life, efficiency, color temperature and color property of the LED.

Contents of the invention

The invention provides a light-emitting device with a hygroscopic structure, comprising: a base; several light-emitting diodes arranged on the base, wherein the light-emitting diodes are separated from each other by an interval; and a moisture-absorbing A layer is arranged on the base and between the light emitting diodes.

The present invention further provides a light-emitting device with a moisture-absorbing structure, comprising: a base; several light-emitting diodes arranged on the base; and a moisture-absorbing component arranged on at least one side of the base, wherein The absorbent assembly includes an absorbent layer.

In order to make the above and other objects, features, and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

Description of drawings

FIG. 1 is a series of cross-sectional views for illustrating a light emitting device with a hygroscopic structure according to a first embodiment of the present invention.

FIG. 2A is a cross-sectional view illustrating a light emitting device with a hygroscopic structure according to a second embodiment of the present invention.

2B is a cross-sectional view for illustrating the moisture absorption mechanism of the light emitting device with the moisture absorption structure according to the second embodiment of the present invention.

FIG. 3A is a cross-sectional view illustrating a light emitting device with a hygroscopic structure according to a third embodiment of the present invention.

3B is a cross-sectional view for illustrating the moisture absorption mechanism of the light emitting device with the moisture absorption structure according to the third embodiment of the present invention.

Reference signs:

10: Lighting device

11: Pedestal

11a: thermal via

13: light emitting diode

15: Hygroscopic layer

17: thermal conductivity substrate

20: Lighting device

21: Insulation substrate

22: Interface

22a: Upper side wall of the insulating base plate

22b: The lower side wall of the insulating base plate

23: Heater

25: Hygroscopic layer

27: spacer

29: shell

29a: Hygroscopic port

29b: exhaust port

30: Lighting device

200, 300: Hygroscopic components

201: Hygroscopic zone

203: Dehumidification area

301: heat storage area

303: Hygroscopic zone

305: Dehumidification area

Detailed ways

The present invention has been disclosed in the following specification with several preferred embodiments, but it is not intended to limit the present invention. Anyone skilled in the art can make any changes without departing from the spirit and scope of the present invention. Move and retouch. In some instances, well-known structures and processes are not described in detail in order to avoid obscuring the present invention.

Please refer to FIG. 1 , which shows a cross-sectional view of a light emitting device with a hygroscopic structure according to a first embodiment of the present invention. The light emitting device 10 includes a base 11 , a light emitting diode 13 and a hygroscopic layer 15 . The light emitting diodes 13 are disposed on the base 11 and separated from each other by a space. A hygroscopic layer 15 is disposed on the base 11 and between the LEDs 13 .

Hygroscopic layer 15 can be organic material and inorganic material, and wherein organic material is liquid adsorption material, for example the aqueous solution of organic alcohols, such as ethylene glycol (ethylene glycol), propylene glycol (propylene glycol), diethylene glycol (diethylene glycol) or triglyceride Alcohol (triethylene glycol, TEG).

Inorganic materials are solid adsorption materials, such as barium oxide (BaO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), calcium chloride (CaCl ₂ ), calcium hydride (CaH ₂ ), sodium hydride ( NaH), calcium sulfate (CaSO ₄ ), calcium carbonate (CaCO ₃ ), magnesium sulfate (MgSO ₄ ), sodium sulfate (Na ₂ SO ₄ ), lithium bromide (LiBr), lithium chloride (LiCl), zeolite (zeolite), Aluminum oxide gel, activated carbon (charcoal), silica gel (silicon), or a combination of the above. Among the above materials (such as zeolite, charcoal, etc.) have a porous structure, which can increase the adsorption surface area, so that the moisture absorption effect is better.

It should be noted that the present invention uses the design of the hygroscopic layer to absorb the moisture in the light-emitting device, so as to reduce the defect rate of the light-emitting device and prolong the service life of the light-emitting device. Therefore, when the moisture-absorbing layer is used for a period of time, it is necessary to replace the moisture-absorbing layer to maintain the moisture-absorbing function of the light emitting device.

Please refer to FIG. 2A , which shows a cross-sectional view of a light emitting device with a hygroscopic structure according to a second embodiment. The light emitting device 20 includes a base 11 , a light emitting diode 13 and a hygroscopic component 200 , wherein the hygroscopic component 200 includes a hygroscopic layer 25 . Several light emitting diodes (light emitting diode, LED) 13 are disposed on the base 11 and separated from each other by a space.

The hygroscopic assembly 200 is arranged on at least one side of the base 11 (shown on the right side of the base 11 in FIG. Composed, wherein the insulating substrate 21 and the heater 23 are adjacent to each other with an interface (interface) 22 therebetween, and the hygroscopic layer 25 is disposed on part of the insulating substrate 21 and part of the heater 23 . In another embodiment, the hygroscopic component 200 can also be disposed on the left and right sides of the base 11 .

The above-mentioned heat-insulating substrate 21 is, for example, heat-resistant polymer or ceramic. The hygroscopic layer 25 can be made of organic materials and inorganic materials, wherein the organic materials are liquid absorbent materials, such as aqueous solutions of organic alcohols, such as ethylene glycol, propylene glycol, diethylene glycol or triglycerides. Alcohol (triethylene glycol, TEG).

Inorganic materials are solid adsorption materials, such as barium oxide (BaO), magnesium oxide (MgO), calcium oxide (CaO), strontium oxide (SrO), calcium chloride (CaCl ₂ ), calcium hydride (CaH ₂ ), sodium hydride ( NaH), calcium sulfate (CaSO ₄ ), calcium carbonate (CaCO ₃ ), magnesium sulfate (MgSO ₄ ), sodium sulfate (Na ₂ SO ₄ ), lithium bromide (LiBr), lithium chloride (LiCl), zeolite (zeolite), Aluminum oxide gel, activated carbon (charcoal), silica gel (silicon), or a combination of the above.

The spacer 27 is disposed on the hygroscopic layer 25 and located on the interface 22, and the housing (housing) 29 is disposed on the spacer 27 and covers the heat insulating substrate 21, the heater 23 and the hygroscopic layer 25, wherein the housing 29 , the spacer 27 and the heat insulating substrate 21 form a moisture absorption area 201 , and the shell 29 , the spacer 27 and the heater 23 form a dehumidification area 203 . The casing 29 includes a moisture absorption port 29 a formed in the moisture absorption area 201 and an exhaust port 29 b formed in the dehumidification area 203 . The spacer 27 and the housing 29 can be made of organic plastic, inorganic plastic, metal, ceramic plate, organic packaging material or inorganic packaging material.

Please refer to FIG. 2B , which shows the dehumidification mechanism of the moisture-absorbing element 200 according to the second embodiment of the present invention. The direction of the arrow in the figure represents the path of moisture. The moisture will enter from the moisture-absorbing area 201 and be absorbed by the moisture-absorbing layer 25. When the moisture moves to the dehumidification area 203, the moisture is heated by the heater 23 into gas, and the gas is finally discharged from the exhaust port 29b. In addition, a fan (not shown in the figure) may also be provided in the dehumidification area 203 in order to facilitate gas discharge.

During actual operation, a counter (not shown) can be set in the heater 23. When the moisture absorption layer 25 collects moisture to a certain extent, the heater 23 is started by the counter to heat the moisture into gas, and then The exhaust port 29b exhausts gas.

It should be noted here that the second embodiment of the present invention has a cyclic hygroscopic element, which can absorb moisture through the hygroscopic layer 25, and then discharge the moisture through the heater 23, so as to effectively achieve a cyclic dehumidification effect .

Please refer to FIG. 3A , which shows a cross-sectional view of a light emitting device 30 with a hygroscopic structure according to a third embodiment, which also has a cyclic hygroscopic element, wherein the same elements as those of the second embodiment are denoted by the same symbols. The difference between the second embodiment and the third embodiment is that the base 11 and the hygroscopic component 300 of the third embodiment are arranged on a thermally conductive substrate 17, and the heater 23 is adjacent to the upper side wall 22a of the thermally insulating substrate 21, A gap is left adjacent to the lower side wall 22 b of the heat insulating substrate 21 , and the gap is sealed by the casing 29 to form a heat storage area (sealing space) 301 .

The hygroscopic layer 25 is disposed on part of the heat insulating substrate 21 and part of the heater 23 , and the material of the hygroscopic layer 25 is the same as that of the first embodiment, and will not be repeated here. In addition, the housing 29 , the spacer 27 and the heat insulating substrate 21 form the moisture absorption area 303 , and the housing 29 , the spacer 27 and the heater 23 form the dehumidification area 305 .

It should be noted that, since the third embodiment adds a thermal conduction substrate 17 compared with the second embodiment, at this time, the base 11 preferably has several thermal vias (thermal via) 11a, and the thermal vias 11a are set Under the light-emitting diode 13, the heat emitted by the light-emitting diode 13 is conducted to the heat storage area 301 in the hygroscopic component 300. The heat storage area 301 is used to store the heat of the light-emitting diode 13 and is used to help heat the hygroscopic layer 25 .

Please refer to FIG. 3B , which shows the dehumidification mechanism of the moisture-absorbing assembly 300 according to the third embodiment of the present invention. The direction of the arrow in the figure represents the path of moisture. The moisture will enter from the moisture-absorbing area 303 and be absorbed by the moisture-absorbing layer 25. When the moisture moves to the dehumidification area 305, the heater 23 heats the moisture into gas, and the gas is finally discharged from the exhaust port 29b. In addition, a fan (not shown in the figure) may also be provided in the dehumidification area 305 in order to facilitate gas discharge.

During actual operation, a counter (not shown) can be set in the heater 23. When the moisture absorption layer 25 collects moisture to a certain extent, the heater 23 is started by the counter to heat the moisture into gas, and then The exhaust port 29b exhausts gas.

In summary, the disclosed embodiments of the present invention all have a hygroscopic structure, which can be used to absorb moisture in the light-emitting device, and even remove the moisture with the assistance of a heater, so as to prolong the light emission The service life of the device.

Although the present invention has been disclosed above with several preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make arbitrary changes and modifications without departing from the spirit and spirit of the present invention. scope.

Claims (15)

1. A light-emitting device with a hygroscopic structure, comprising: a base; a plurality of light emitting diodes disposed on the base, wherein the light emitting diodes are separated from each other by a gap; and A hygroscopic layer is arranged on the base and between the light emitting diodes. 2. The light-emitting device with a hygroscopic structure according to claim 1, wherein the hygroscopic layer comprises organic materials or inorganic materials. 3. The light-emitting device with a hygroscopic structure according to claim 2, wherein the organic material comprises ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol or a combination thereof. 4. The light emitting device with hygroscopic structure according to claim 2, wherein the inorganic material comprises barium oxide, magnesium oxide, calcium oxide, strontium oxide, calcium chloride, calcium hydride, sodium hydride, calcium sulfate, calcium carbonate, sulfuric acid Magnesium, sodium sulfate, lithium bromide, lithium chloride, zeolite, alumina gel, activated carbon, silica gel or combinations thereof. 5. A light emitting device with a hygroscopic structure, comprising: a base; Several light emitting diodes are arranged on the base; and A hygroscopic component is arranged on at least one side of the base, wherein the hygroscopic component includes a hygroscopic layer. 6 . The light-emitting device with a moisture-absorbing structure according to claim 5 , wherein the base and the moisture-absorbing component are further disposed on a thermally conductive substrate. 7. The light-emitting device with a moisture-absorbing structure according to claim 6, wherein the base has several heat conduction holes, and the heat conduction holes are disposed under the light-emitting diodes. 8. The light-emitting device with a hygroscopic structure according to claim 5, wherein the hygroscopic component further comprises: a heat-insulating substrate; a heater adjacent to the insulating substrate, wherein the insulating substrate has an interface with the heater; and A hygroscopic layer is arranged on part of the insulating substrate and part of the heater. 9. The light-emitting device with a moisture absorption structure according to claim 8, wherein the heater is adjacent to the upper sidewall of the heat-insulating substrate to form a gap adjacent to the lower sidewall of the heat-insulating substrate. 10. The light emitting device with a hygroscopic structure according to claim 8, wherein the heater further comprises a counter. 11. The light emitting device with a hygroscopic structure according to claim 8, further comprising: a spacer disposed on the moisture-absorbing layer and located on the interface; and A casing, arranged on the spacer and covering the heat-insulating substrate, the heater and the moisture-absorbing layer, wherein a moisture-absorbing area is formed by the casing, the spacer, and the heat-insulating substrate, and the casing, the heat-insulating substrate The spacer and the heater form a dehumidification area, and the casing includes a moisture absorption port formed in the moisture absorption area and an exhaust port formed in the dehumidification area. 12. The light emitting device with a hygroscopic structure according to claim 11, wherein the dehumidification area further comprises a fan. 13. The light-emitting device with a hygroscopic structure according to claim 5, wherein the hygroscopic layer comprises organic materials or inorganic materials. 14. The light-emitting device with a hygroscopic structure according to claim 13, wherein the organic material comprises ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol or a combination thereof. 15. The light emitting device with hygroscopic structure according to claim 13, wherein the inorganic material comprises barium oxide, magnesium oxide, calcium oxide, strontium oxide, calcium chloride, calcium hydride, sodium hydride, calcium sulfate, calcium carbonate, sulfuric acid Magnesium, sodium sulfate, lithium bromide, lithium chloride, zeolite, alumina gel, activated carbon, silica gel or combinations thereof.

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