The specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
See also Fig. 2 and Fig. 3, a kind of light supply apparatus 20 that first embodiment of the invention provides, it comprises insulator 21, heat carrier 22, the first electrodes 23, the second electrodes 24, light-emitting diode chip for backlight unit 25, and metal wire 26.
Insulator 21 comprises a support portion 210 and one and these support portion 210 integrated light-reflecting portion 212.This light-reflecting portion 212 is positioned at a side of this support portion 210, and in the present embodiment, light-reflecting portion 212 is positioned at the top of support portion 210.This light-reflecting portion 212 has a storage tank 2120, and the bottom of this storage tank 2120 extends to this support portion 210, and promptly this support portion 210 and this storage tank 2120 relative parts are exposed to the bottom of this storage tank 2120.This storage tank 2120 has a conical side wall 2102, on this conical side wall 2102 reflecting layer 2104 can be set.Insulator 21 material therefors can be plastics, and for example poly-terephthalate p-phenylenediamine (PPD) (Polyphthalamide, PPA), liquid crystal polymer (Liquid crystal polymer, LCP) etc.
Heat carrier 22 is embedded in the support portion 210 of insulator 21 and relative with this storage tank 2120 along the direction near this light-reflecting portion 212.Heat carrier 22 has a supporting part 220 and a bottom 221 relative with this supporting part 220 that is exposed to these storage tank 2120 bottoms, and this supporting part 220 is in order to carry this light-emitting diode chip for backlight unit 25.In the present embodiment, the width d of this supporting part 220 is less than the width D of this bottom 221.Heat carrier 22 material therefors can be the metal that copper, aluminium etc. have better heat conductivility, or conduction materials such as silica gel, pottery.
First electrode 23 and second electrode 24 are tabular, be that the two does not all have the bending place, thereby make it do the time spent and can not cause situation generations such as fracture more greatly being subjected to big external force, improved the reliability of first electrode 23 and second electrode 24 by himself STRESS VARIATION.One end of one end of first electrode 23 and second electrode 24 is embedded in the junction of the support portion 210 of this insulator 21 and light-reflecting portion 212 respectively and all extends in this storage tank 2120, and has the part that is exposed to these storage tank 2120 bottoms respectively.The other end of the other end of first electrode 23 and second electrode 24 all extends this storage tank 2120, in order to link to each other with external circuit (figure does not show).First electrode 23 and second electrode 24 all with heat carrier 22 electric insulations.In addition, first electrode 23 and second electrode 24 are separately positioned on the left and right sides of this light-emitting diode chip for backlight unit 25, at this, this light-emitting diode chip for backlight unit 25 forms with the part that is exposed to these storage tank 2120 bottoms of first electrode 23 and second electrode 24 respectively by two metal line 26 and is electrically connected.
Light-emitting diode chip for backlight unit 25 is arranged on the supporting part 220 of heat carrier 22, can form thermally coupled by bonding mode and heat carrier 22 at this light-emitting diode chip for backlight unit 25, for example between the supporting part 220 of light-emitting diode chip for backlight unit 25 and heat carrier 22, be provided with viscose glues such as elargol, conducting resinl.Be understandable that light-emitting diode chip for backlight unit 25 also can form thermally coupled, for example eutectic mode (Eutectic Bonding) by other modes and heat carrier 22.The light that light-emitting diode chip for backlight unit 25 sends penetrates via the opening of this storage tank 2120, the light that is incident on the sidewall 2102 of this storage tank 2120 can penetrate via 2104 reflections of the reflecting layer on this sidewall 2102 and from the opening of this storage tank 2120, thereby has improved the light extraction efficiency of light-emitting diode chip for backlight unit 25.
Light supply apparatus 20 also comprises a packaging body 27, and packaging body 27 is arranged in the storage tank 2120 of insulator 21 in order to covering luminousing diode chip 25 and metal wire 26, and is oxidized to avoid light-emitting diode chip for backlight unit 25 to contact with aqueous vapor with metal wire 26.The outer surface 270 of packaging body 27 can be convex surface or concave curved surface, changing light that light-emitting diode chip for backlight unit 25 the sends angle via outer surface 270 outgoing, thereby can change the range of exposures of light supply apparatus 20.Also can be provided with light wavelength conversion material, for example fluorescent material in the packaging body 27.If be doped with yellow fluorescent powder in the packaging body 27, the blue light that light-emitting diode chip for backlight unit 25 sends has the part blue light to be converted into gold-tinted during via packaging body 27 outgoing, the blue light that is not converted with will form white light after the gold-tinted that is converted to combines.Packaging body 27 material therefors are the transparent material of epoxy resin, silicones or other electric insulations.
In the present embodiment, heat carrier 22, first electrode 23 and second electrode 24 are to be arranged in the insulator 21 by embedded ejection forming technique (insert-molding), guaranteed to have the excellent electric insulating energy between first electrode 23 and second electrode 24 and the heat carrier 22, and had good heat-conductive characteristic between heat carrier 22 and the insulator 21.
Because being set directly on the supporting part 220 of heat carrier 22 and with heat carrier 22, light-emitting diode chip for backlight unit 25 forms good thermally coupled, so the heat that light-emitting diode chip for backlight unit 25 produces when luminous can be directly conducted to heat carrier 22, by heat carrier 22 heat that absorbs is conducted to extraneous air again, thereby reduced the temperature of light-emitting diode chip for backlight unit 25, improved the radiating efficiency of light supply apparatus 20, and the luminous efficiency of light-emitting diode chip for backlight unit 25 and service life.
In addition, first electrode 23 and second electrode 24 are positioned at the first half of light supply apparatus 20, and extend this storage tank 2120 to link to each other with external circuit (figure does not show), make external circuit be positioned at the top of this light supply apparatus 20; And light-emitting diode chip for backlight unit 25 with its below 22 hot connections of heat carrier, make the heat conduction of this light supply apparatus 20 be directed downwards, thereby effectively avoided external circuit, and then reduced the thermal resistance of this light supply apparatus 20, improved its heat dissipation.
See also Fig. 4, the bottom 221 of heat carrier 22 also can have a through hole 2210, can make the part-structure in this support portion 210 be covered with this through hole 2210 when making heat carrier 22 be arranged in the support portion 210 of insulator 21 by embedded ejection forming technique, the contact area that has improved heat carrier 22 and support portion 210 with contact reliability.The width H of the bottom 221 of heat carrier 22 has improved the radiating efficiency of heat carrier 22 effectively greater than the overall width h of this first electrode 23 and second electrode 24.
See also Fig. 5, heat carrier 22 has a rectangular structure, and it has part to be exposed to this storage tank 2120 bottoms, light-emitting diode chip for backlight unit 25 be arranged on the heat carrier 22 and with these heat carrier 22 thermally coupleds, at this, light-emitting diode chip for backlight unit 25 is positioned at the bottom of this storage tank 2120.
See also Fig. 6 and Fig. 7, a kind of light supply apparatus 30 that second embodiment of the invention provides, the light supply apparatus 20 that itself and above-mentioned first embodiment provide is basic identical, difference is: first electrode 33 and second electrode 34 are strip, the two is separately positioned on the relative both sides of light-emitting diode chip for backlight unit 25, all there is the part of the storage tank 310 that is exposed to insulator 31 at the middle part 330 of first electrode 33 and the middle part 340 of second electrode 34, and this storage tank 310 is extended at the two ends of the two ends of this first electrode 33 and this second electrode 34 respectively; The bottom 321 of heat carrier 32 is a T-shape structure, the contact area that has improved heat carrier 32 and insulator 31 with contact reliability.At this, this storage tank 310 is extended at the two ends of the two ends of this strip first electrode 33 and this strip second electrode 34 respectively, help and external circuits plate serial or parallel connection, improved the practicality of light supply apparatus 30 and the wires design flexibility of the circuit board that links to each other with this light supply apparatus 30.
See also Fig. 8, a kind of light supply apparatus 40 that third embodiment of the invention provides, the light supply apparatus 20 that itself and above-mentioned first embodiment provide is basic identical, and difference is:
The supporting part 420 of heat carrier 42 is provided with a heat conduction paster (Submount) 48, can engage by bonding mode or eutectic mode between this heat conduction paster 48 and this supporting part 420, these heat conduction paster 48 material therefors can be silicon, aluminium nitride, beryllium oxide, silica, class diamond (Diamond like Carbon), ceramic aluminium base (Ceramic Aluminim substrate) etc.;
Chip package (Flip chip) is on heat conduction paster 48 by the metal coupling 49 (for example golden projection, tin ball etc.) on two positive and negative electrodes that are formed on light-emitting diode chip for backlight unit 45 for light-emitting diode chip for backlight unit 45, and these two metal couplings 49 are connected with first electrode 43 and second electrode, 44 routings respectively.
See also Fig. 9, a kind of light supply apparatus 50 that fourth embodiment of the invention provides, it comprises a circuit board 500, the light supply apparatus 20 that a plurality of first embodiment provide, and a radiating fin 510.
Circuit board 500 has a plurality of through holes 501 and is arranged on these circuit board 500 1 sides and the metal connecting layer 502 between two adjacent through holes 501, and the light-reflecting portion 212 of each light supply apparatus 20 is located in respectively in these a plurality of through holes 501.First electrode 23 and second electrode 24 are electrically connected with the metal connecting layer 502 of this circuit board 500.
The side relative that radiating fin 510 is arranged on these a plurality of light supply apparatuses 20 with this circuit board 500, and with 22 hot connections of heat carrier of each light supply apparatus 20 in order to this light supply apparatus 20 is dispelled the heat.
Because these a plurality of light supply apparatuses 20 are arranged between this circuit board 500 and this radiating fin 510, first electrode 23 of each light supply apparatus 20 and second electrode 24 are electrically connected with the metal connecting layer 502 of this circuit board 500.So, this circuit board 500 is positioned at the top of these a plurality of light supply apparatuses 20, and the heat carrier 22 of each light supply apparatus 20 all with 510 hot connections of radiating fin, make the heat conduction of these a plurality of light supply apparatuses 20 be directed downwards, thereby effectively avoided this circuit board 500, and then reduced the thermal resistance of light supply apparatus 50, improved its heat dissipation.
Be understandable that the light supply apparatus that above-mentioned second, third embodiment provided can be applied among above-mentioned the 4th embodiment equally.
In addition, those skilled in the art also can do other variation in spirit of the present invention, as long as it does not depart from technique effect of the present invention, the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.