Source: http://www.google.com/patents/US20040208210?dq=5998925
Timestamp: 2017-02-23 21:29:48
Document Index: 617901366

Matched Legal Cases: ['§ 119', 'Application No.2003', 'Application No.2003', 'Application No. 7', 'Application No. 7', 'Application No. 6', 'Application No. 2001', 'Application No. 7', 'Application No. 6', 'Application No. 7']

Patent US20040208210 - Light-emitting apparatus package, light-emitting apparatus, backlight ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA light-emitting apparatus package of the present invention includes (i) an electrically insulated ceramic substrate, (ii) a first concave section formed in the direction of thickness of the ceramic substrate so as to form a light exit aperture in a surface of the ceramic substrate, (iii) a second concave...http://www.google.com/patents/US20040208210?utm_source=gb-gplus-sharePatent US20040208210 - Light-emitting apparatus package, light-emitting apparatus, backlight apparatus, and display apparatusAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS20040208210 A1Publication typeApplicationApplication numberUS 10/816,736Publication dateOct 21, 2004Filing dateApr 1, 2004Priority dateApr 1, 2003Also published asCN1534355A, CN100587560C, CN101740560A, CN101740560B, CN102290409A, CN102290409B, US7579629, US8030675, US8421109, US8629476, US9241375, US20090302344, US20110309406, US20130214674, US20140124823, US20160240522Publication number10816736, 816736, US 2004/0208210 A1, US 2004/208210 A1, US 20040208210 A1, US 20040208210A1, US 2004208210 A1, US 2004208210A1, US-A1-20040208210, US-A1-2004208210, US2004/0208210A1, US2004/208210A1, US20040208210 A1, US20040208210A1, US2004208210 A1, US2004208210A1InventorsTsukasa InoguchiOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (4), Referenced by (187), Classifications (41), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetLight-emitting apparatus package, light-emitting apparatus, backlight apparatus, and display apparatus
[0001] This Nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No.2003/98554 filed in Japan on Apr. 1, 2003, and Patent Application No.2003/104669 filed in Japan on Apr. 8, 2003, the entire contents of which are hereby incorporated by reference.
[0099] As shown in FIG. 1 and FIG. 2, a light-emitting apparatus in accordance with the present invention includes a plurality of light-emitting devices, for example three light-emitting devices 3, 8, and 9 in a light-emitting apparatus package of ceramic substrate type in accordance with the present invention. The light-emitting devices 3, 8, and 9, are exemplified by rectangular-shaped LED and semiconductor laser. [0100] The light-emitting apparatus package includes (i) a ceramic substrate 10 having electric insulation and good thermal conduction, (ii) a first concave section 10 e formed by hollowing out the ceramic substrate 10 in its thickness direction such that a light exit aperture is provided, (iii) a second concave section 10 d formed by further hollowing out the first concave section 10 e in the thickness direction such that the light-emitting devices 3, 8, and 9 are provided therein, and (iv) wiring patterns 11 a, provided in the first concave section 10 e, for supplying electric power to the respective light-emitting devices 3, 8, and 9. In other words, the wiring pattern 11 a is provided on an upper surface (first surface; light-emitting surface) of the ceramic substrate 10, i.e., on a side of a surface on which the light-emitting devices 3, 8, and 9 are provided. [0101] The light-emitting apparatus package includes a metallized layer 12 that provided on an inside-concave-section surface of the ceramic substrate in such a manner that the area for mounting the light-emitting device is sandwiched between the metalized layer and the light exit aperture, and in such a manner that the metalized layer is electrically insulated from the wiring pattern, the metalized layer having a light reflective property. The light exit aperture corresponds to an opening section of the first concave section 10 e of the ceramic substrate 10. [0102] In the following description, the above light-emitting apparatus package is described based on the steps of manufacturing the package. As shown in FIG. 3 and FIG. 4, the ceramic substrate 10, which is molded so as to have a shape of substantially a rectangle, includes multiple layers—for example, three layers—of ceramic substrates 10 a, 10 b, 10 c which are tightly layered one another in the thickness direction. The ceramic substrates 10 a, 10 b and 10 c are made of a material such as silicon carbide (SiC), alumina (Al2O3), or aluminum nitride (AlN) that is electrical insulator and has a good thermal conduction. Of those materials, AlN is preferably used because AlN is easily molded. [0103] The word “electrical insulator” means a resistance (RT) of not less than 1010 (Ω·cm), more preferably, a resistance (RT) of not less than 1012 (Ω·cm). The word “good thermal conduction” means a thermal conductivity of not less than 18 (W/m·k), more efficiently, a thermal conductivity of not less than 60 (W/m·k), and most preferably, a thermal conductivity of not less than 140 (W/m·k). [0104] In order to fabricate the ceramic substrates 10 a, 10 b and 10 c, a ceramic material is filled in a predetermined mold, is formed by the hot press molding, and then is sintered. The similar material and fabrication process to those of the ceramic substrates 10 a, 10 b, and 10 c are used to obtain the other ceramic substrates described below. Note that the ceramic substrate 10 has a structure of multiple layers, however, the ceramic substrate 10 may have a structure of a single layer. [0105] In the middle of the ceramic substrate 10 b, a taper-shaped first through-hole is formed so as to penetrate the ceramic substrate 10 b in the thickness direction. The diameter of the first through-hole (the width in a surface direction of the ceramic substrate 10) is narrower toward the substrate 10 a from the substrate 10 c. A wall of the first through-hole and a part of the surface of the ceramic substrate 10 a constitute the foregoing second concave section 10 d, the part of the surface being a bottom surface of the second concave section 10 d. Since the frustum of circular cone shape is easily formed and has high light-reflectivity as described below, the second concave section 10 d preferably has a shape of frustum of circular cone—for example, conical-cone-shaped and cup-shaped—which allows the light to easily reflect toward the light exit aperture of the concave section. [0106] In the middle of the ceramic substrate 10 c, a taper-shaped second through-hole is formed so as to penetrate the ceramic substrate 10 c in the thickness direction. The diameter of the through-hole is broader toward the substrate 10 c from the substrate 10 b. A wall of the first through-hole and a part of the surface of the ceramic substrate 10 b constitute the foregoing first concave section 10 e, the part of the surface being a bottom surface of the first concave section 10 e. Therefore, the second concave section is further formed at the bottom surface of the first concave section 10 e. [0107] It is preferable that the axes of symmetry of the first concave 10 e and the second concave 10 d are positioned so as to be coaxial. The axes of symmetry are in the thickness direction of the ceramic substrate 10 b and 10 c respectively. It is also preferable that the first concave section 10 e has a shape of frustum of pyramid. This is because wiring patterns 11 a are easily provided and a wiring process is also easily carried out. [0108] The wiring patterns 11 a are provided to supply electricity to the light-emitting devices 3, 8, and 9 on a peripheral surface of the ceramic substrate 10 b, the peripheral surface being the bottom surface of the first concave section 10 e. Each of the wiring patterns 11 a extends to an area where the wiring pattern 11 a exposes on the bottom surface of the first concave section 10 e from a peripheral edge of the ceramic substrate 10 b. Note that the wiring patterns 11 a are formed not to reach the aperture section of the second concave section 10 d. In other words, the wiring pattern 11 a can extend up to such an area as not to reach the aperture section of the second concave section 10 d. [0109] Terminal patterns 11 b, which are used for external connecting, are electrically connected to respective corresponding wiring patterns 11 a. The terminal patterns 11 b are provided to extend (i) to the upper surface (the surface having the light exit aperture) of the ceramic substrate 10 c, (ii) to an end face of the ceramic 10 c that is connected to the upper surface, and (iii) to an end face of the ceramic substrate 10 b that is connected to the end face of the ceramic 10 c. [0110] With this arrangement, via the terminal patterns 11 b and the wiring patterns 11 a, the power source can be supplied to the light-emitting devices 3, 8, and 9, respectively. Further, it is possible to carry out the external connecting via the terminal patterns 11 b provided on the upper surface of the ceramic substrate 10 c. On this account, even in cases where a radiator (heat discharging member) is provided on a side of the ceramic substrate 10 a, i.e., on a back opposite surface side of the light exit aperture, it is possible to improve the radiation efficiency of the radiator without a conventional connecting substrate between the radiator and the ceramic substrate 10 a unlike the conventional arrangement shown in FIG. 39 and FIG. 40. [0111] Furthermore, in the light-emitting apparatus package, the metalized (metal) layer 12 (i) of which the heat conduction is better (larger) than that of the respective ceramic substrates 10 a, 10 b, and 10 c is provided so as to partially constitute the second concave section 10 d, and (ii) on which the respective light-emitting devices 3, 8, and 9 are provided. The metalized layer 12 can be made of any material having high light reflectivity and good heat-conductance, and is exemplified by such as a silver (Ag) plating. [0112] The metalized layer 12 preferably has such a light reflectivity that reflects 50%—more preferably 70%—of the incident light. In the present embodiments, it is preferable that the metalized layer 12 is provided on substantially the entire surface of the second concave section 10 d. [0113] The metalized layer 12 may be provided in such a hem manner, in such a flange manner, or in such a radial manner as to extend outward on an inner surface of the first concave section 10 e, provided that the metalized layer 12 is spaced away from the respective wiring patterns 11 a and is maintained to be electrically insulated from the wiring patterns 11 a. Note that the other metalized layers (later described) may be similar to the metalized layer 12 when a material or a manufacturing method thereof is not specified. [0114] In a light-emitting apparatus of the present invention in which the foregoing light-emitting apparatus package is used, as shown in the FIG. 5 and FIG. 6, the light-emitting devices 3, 8, and 9 are firmly adhered by a conductive adhesive agent (not shown) to the metalized layer 12 of the second concave section 10 d. The conductive adhesive agent has good heat-conduction and good electric conduction. [0115] Here, the light-emitting devices 3, 8, and 9 are provided so that the respective light irradiated from the light-emitting devices 3, 8, and 9 are directed to the ceramic substrate 10 b from the substrate 10 a along the thickness direction of the substrates 10 a, 10 b, 10 c, i.e., to the light exit aperture of the light-emitting apparatus package. Namely, the respective lights are directed toward an opening from which the respective lights are emitted out. [0116] Furthermore, in the present embodiment, power supplying electrodes for the light-emitting devices 3, 8 and 9 are provided on a surface other than the surface on which the light-emitting devices 3, 8 and 9 are fixed. Preferably, the electrodes for the light-emitting devices 3, 8, and 9 are provided on a same surface as a light-emitting surface from which the respective lights are emitted out. [0117] In the light-emitting apparatus, each electrode for the light-emitting devices 3, 8 and 9 is connected to its corresponding wiring pattern 11 a via a gold (Au) wire 4. Instead of gold, silver or copper or aluminum or metal alloying of gold and any one of the above-mentioned metals may be used. [0118] Therefore, the light-emitting devices 3, 8 and 9 are provided on a surface that is different from the surface where the wiring patterns 11 a are provided. In other words, the light-emitting devices 8 and 9 are provided on the bottom surface of the second concave section 10 d, the bottom surface being provided under the surface on which the wiring patterns 11 a are formed. [0119] Furthermore, in the second concave section 10 d and in the first concave section 10 a, a transparent resin section 14, having excellent translucency and made of such as an acrylic resin, is filled such that the top surface of the transparent resin section 14 and the top surface (upper surface) of the ceramic substrate 10 c are coincident with each other. [0120] According to the light-emitting apparatus includes (i) the ceramic substrates 10 a, 10 b, and 10 c having good heat-conduction,—particularly the ceramic substrates 10 a and 10 b—and (ii) the metalized layer 12. On this account, even when the light-emitting devices 3, 8, and 9 generate the heat during their emitting, the heat thus generated can be radiated quickly via the metalized layer 12 and the ceramic substrates 10 a and 10 b, respectively. This ensures to suppress the instability of the light-emitting devices 3, 8, and 9 caused by the temperature-increase. [0121] Further, the metalized layer 12 has the light reflectivity. On this account, even when (i) the ceramic substrates 10 a and 10 b are so thin that light passes through the ceramic substrates 10 a and 10 b, and (ii) the respective light irradiated from the part of the light-emitting devices 3, 8, and 9 is reflected at the surface of the transparent resin section 14, and is directed to the ceramic substrates 10 a and 10 b as the respective stray light, the metalized layer 12 reflects the respective stray light in the direction along with the light radiation of the light-emitting devices 3, 8, and 9. This ensures to improve the utilization efficiency of the light. [0122] [Second Embodiment]
[0253] In the Thirteenth Embodiment, as shown in FIG. 56, on a top surface of a connecting substrate 103F, a transparent sheet member containing a fluorescer is provided. The fluorescer reacts the light emitted from the LED chip 122 so as to obtain a desired emission color. [0254] [0254]FIG. 56 is a cross sectional view showing an arrangement of an LED lighting apparatus of the Thirteenth Embodiment in accordance with the present invention. In FIG. 56, an LED lighting apparatus 101H includes a concave section 121 d provided in the ceramic substrate 121F. Within the concave section 121 d, an LED chip 122 a whose emission color corresponds to blue or a ultra violet region is provided with its bottom surface made contact with the ceramic substrate 121F. The LED chip 122 a is die-bonded to a wiring pattern, (not shown) provided within the concave section 121 d, at its predetermined position. [0255] An electrode of the LED chip 122 a is wire-bonded to a wiring pattern (not shown), provided around the upper surface of the ceramic substrate 121 F, at its predetermined position via a connecting wire 123, thereby preparing an LED element substrate 102C. [0256] A transparent sheet member 138 containing a fluorescer is provided on a top surface of the connecting substrate 103. When the fluorescer reacts the light emitted from the LED chip 122, the fluorescer is excited by the light, the transparent sheet member 138 emits a predetermined colored light which is different color from the light emitted from the LED chip 122 a. [0257] The light emitted from the LED chip 122 a is mixed with the light reflected (irradiated) by the transparent sheet member 138, thereby obtaining a desired colored light such as white colored light. The provision of the transparent sheet member 138 allows the step of mixing a fluorescer to the LED chip 122 a to be omitted. On this account, it is possible to greatly improve the manufacturing efficiency. [0258] Note that the Thirteenth Embodiment deals with the case where a transparent sheet member containing a fluorescer is provided, however, the present invention is not limited to this. For example, in cases where the LED chip 122 a and the connecting wire 123 are molded by a resin, it is possible to obtain a similar effect when a fluorescer is added to the molding resin. [0259] Note also that in the Thirteenth Embodiment, the concave section 121 d, where the LED chip 122 a is provided, may include two concave sections: a deep concave section 121 a and a shallow concave section 121 b, as described in Seventh Embodiment. The shallow concave section 121 b is provided around the deep concave section 121 a formed. [0260] Incidentally, well-known arrangements of conventional LED lighting apparatuses are shown in FIG. 57 through FIG. 61. FIG. 57 is a perspective view illustrating an arrangement of a conventional LED element substrate. In FIG. 57, in a LED element substrate 40, wiring patterns 42 are provided on a resin substrate 41 made of glass-epoxy resin or other material. A single LED chip 43 or a plurality of LED chips 43 (in case where a plurality of LED chips are provided, their colors are different from each other) are die-bonded to the wiring patterns 42. [0261] An electrode of the LED chip 43 (the electrode is provided on the light-emitting surface of the LED chip 43) is wire-bonded to one of the wiring patterns 42, at a predetermined position, via a connecting wire 44 made of gold or the like. The LED chip 43 and the connecting wire 44 are covered and sealed with a molding resin 45 such as epoxy resin or the like. Electrode wiring terminals 46, which electrically carries out external connections of the LED element substrate 40A, are provided so as to extend and bridge between a part of a bottom surface of the resin substrate 41 and a part of a top surface of the resin substrate 41 via a side surface of the resin substrate 41, the bridged parts being like a U-shaped. [0262] In the meantime, another arrangement of a well-known conventional LED element substrate is shown in FIG. 58. In FIG. 58, an LED element substrate 40A includes a concave section 41 a in a resin substrate 41A. Within the concave section 41 a, wiring patterns 42 are provided. A single or a plurality of LED chips 43 (in the case where a plurality of LED chips are provided, their colors are different from each other) are die-bonded by a solder (not shown in the figure) or the like to the wiring patterns 42. [0263] In this case, the LED chip 43 is soldered with its bottom surface made contact with the resin substrate 41A. An electrode of the LED chip 43 (the electrode is provided on the light-emitting surface of the LED chip 43) is wire-bonded to one of the wiring patterns 42, at a predetermined position, via a connecting wire 44 made of gold or the like. The concave section 41 a is covered and sealed with a molding resin 45A such as epoxy resin or the like. Electrode wiring terminals 46, which electrically carries out external connections of the LED element substrate 40A, are provided so as to extend and bridge between a part of a bottom surface of the resin substrate 41 and a part of a side surface of the resin substrate 41, the bridged parts being like an L-shaped. [0264] In cases where an LED lighting apparatus, such as a light source for illumination, is arranged by using the conventional LED element substrate 40 or 40A shown in FIG. 57 and FIG. 58, a plurality of LED element substrates 40 or 40A are attached to a connecting substrate 47, made of a glass-epoxy resin or the like, by solders 47 a or the like (see FIG. 59 or FIG. 60) in a single line or in a plurality of lines. Here, the LED chips 43 are provided with their bottom surfaces made contact with the resin substrates 41 or 41A. [0265] Further, for example, in cases where the LED lighting apparatuses are used in an LCD backlight apparatus or a variety of lighting apparatuses, a large current is required for driving the LED lighting apparatuses. Therefore, the heat caused by the large current driving should be fully radiated. In this case, as shown in FIG. 59 and FIG. 60, a radiator device 48 such as heatsink is provided on a bottom surface of the connected surface 47. [0266] As shown in FIG. 61, the LED lighting apparatuses are provided such that the light from the LED element substrate 40A is entered into a side surface of an light guide plate 49 of the back light apparatus. [0267] For example, a modified example of the LED element substrate 40A shown in FIG. 58 is disclosed in Japanese Publication for Unexamined Patent Application No. 7-38154 (Tokukaihei 7-38154, published on Feb. 7, 1995). In the publication, an LED element substrate is arranged such that two groove sections are provided in a top surface of two facing outer walls among four outer walls surrounding the concave section 41 a. The groove section has a predetermined width, communicates between the concave section 41 a and its outside, and has a depth that is shallower than the height of the concave section 41 a. An electrode of the LED chip 43 is wire-bonded to a wiring pattern provided on a bottom surface of the groove section via a connecting wire 44. [0268] According to the LED element substrate disclosed in Japanese Publication for Unexamined Patent Application No. 7-38154, (i) the resin for the sealing is required only for a small area where the concave section 41 a and the groove section are provided, and (ii) the connecting wire 44 is connected in the bottom surface of the groove that is shallower than the concave section 41 a. This ensures to suppress the resin amount for the concave section 41 a and the groove sections. [0269] On this account, it is possible to reduce the effect caused by the heat and/or stress, thereby improving reliability. In cases where a plurality of LED chips whose emission colors are different from each other are provided, an interval between the LED chips becomes shorter because of the small area of the concave section 41 a, thereby attaining uniform color mixture of the light emitted from the respective LED chips. [0270] Furthermore, since the groove sections can be prepared during the manufacturing process by dividing the grooves provided between the concave sections, it is possible to easily adjust the resin amount based on the squeegee method during filling the resin in the concave section, thereby promoting an efficiency of mass-production processes of the LED element substrate. [0271] In the meantime, described in Japanese Publication for Unexamined Patent Application No. 6-230731 (Tokukaihei 6-230731, published on Aug. 19, 1994) is an LED display apparatus in which (i) a LED chip facing a light transmittance substrate and a driver IC are provided on a bottom surface of the light transmittance, and (ii) an anode electrode of the LED chip is connected to a wiring pattern on the light transmittance substrate via a bump. [0272] According to the publication, even in case where the LED display apparatus is a high-definition display apparatus having a large number of dots, the electrode of the LED chip and the wiring pattern are connected via the bump. Accordingly, it is possible to avoid the increasing of the manufacturing steps and the lowering of yield ratio without increasing the number of the connecting wires. Also, because no connecting wire is provided in an area near the light-emitting surface of the LED chip, the light emitted from the LED chip is not reflected by the connecting wire, thereby improving an optical characteristic. Further, because no LED chip is provided a surface of the substrate through which the light gone out, i.e., is flat, it is possible to obtain a good optical characteristic. Furthermore, when a radiator member is provided on a bottom surface that is opposed to a surface where the LED chip is provided, the heat from the LED chip can be efficiently radiated. The radiator member can be used as a wiring member for connecting the wiring pattern of the substrate having proper light transmittance to the electrode of the LED chip. [0273] In the meantime, disclosed in Japanese Publication for Unexamined Patent Application No. 2001-284659 (Tokukai 2001-284659, published on Oct. 12, 2001) is an LED lighting apparatus in which, (i) on a surface of a metal substrate, a metal container having a hollow section which is filled with liquid having a heat conduction, and (ii) an electrically insulated layer on the metal container, a wiring pattern which is electrically connected to an LED chip. [0274] According to the LED lighting apparatus, the heat caused by the LED chip is conveyed to a lead section of the LED chip, the wiring pattern, the electrically insulated layer, and the metal container in this order. Then, the heat is conveyed to the liquid which fills the hollow section, and spreads over the entire metal container, and finally the heat is radiated into the air. In this case, because the substrate is made of metal, the heat is efficiently conveyed to the metal from the entire metal container. On this account, the heat from the LED chip is efficiently radiated, thereby respectively improving luminous efficiency and duration of life of the LED lighting apparatus. [0275] However, in the conventional LED lighting apparatus shown in FIG. 61, the radiator device 48 such as heatsink is provided on the bottom surface of the connecting substrate 47 (the surface (bottom surface) opposed to the surface where the LED element substrate is provided). On this account, the heat generated by the Led chip 43 is conveyed to the radiator device 48 via (i) the resin substrate 41A constituting the LED element substrate 40A and (ii) the connecting substrate 47. [0276] Here, because the resin substrate 41A and the connecting substrate 47, those of which are provided between the LED chip 43 and the radiator device 48, are made of resin, heat-conduction of the LED lighting apparatus is poor. This causes a problem that the heat is not sufficiently radiated from the LED lighting apparatus. The problem also occurs in cases where the LED element substrate 40 is used. [0277] Further, in cases where a void space is formed between the resin substrate 41A and the connecting substrate 47, a layer of air is formed therebetween. This may deteriorate the heat-conduction worse. [0278] Accordingly, in the LED lighting apparatus, driven by a large current, such as a light source, the large amount of current consumption increases an amount of the heat from the LED chip 43. On this account, more heat stress is imposed on the LED element substrate 40A and sufficient luminosity cannot be obtained. This causes a problem of reliability of the light-emitting property. [0279] On the other hand, according to the LED element substrate disclosed in the above-mentioned Japanese Publication for Unexamined Patent Application No. 7-38154, it is intended to reduce the effect due to the heat stress by reducing amount of resin for sealing the concave section and the groove sections. However, this conventional art does not take any account of the heat conduction between the LED chips served as the heat generation source and the radiator device. Therefore, a similar problem to that of the foregoing conventional LED lighting apparatus. [0280] The present invention is made to solve the conventional problem, and its object is to provide (i) a lighting apparatus which can efficiently carry out the radiation from the LED chip to the radiator device with a simplified structure, (ii) a backlight apparatus in which the lighting apparatus is used, and (iii) a display apparatus in which the backlight apparatus is used. [0281] To achieve the object, a lighting apparatus (another type of light-emitting apparatus) of the present invention includes one or more light-emitting devices for emitting light by converting a current into the light; at least one light-emitting device substrate on a top surface of which at least one of the one or more of the light-emitting devices is provided; a heat-discharging member bonded to at least one of a bottom surface and side surfaces of the light-emitting device substrate. [0282] Preferably, the lighting apparatus of the present invention is so arranged that only an adhesive agent and the light-emitting device substrate are provided between the light-emitting device and the heat discharging member, the adhesive agent for die-boding the light-emitting device and the light-emitting device substrate. [0283] More preferably, the lighting apparatus of the present invention is so arranged as to include a connecting substrate, provided on the top surface of the light-emitting device substrate, having a predetermined wiring pattern for supplying electricity to said one or more light-emitting devices, the connecting substrate having a light-transmitting section provided in a position, corresponding to a position of said one or more light-emitting devices. [0284] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device substrate includes a electrode-wiring terminal in at least one of both edges of the surface of the light-emitting device substrate, the electrode-wiring terminal for establishing connection with a predetermined wiring pattern provided on the connecting substrate. [0285] More preferably, the lighting apparatus of the present invention is so arranged that a plurality of the light-emitting device substrates are arranged in one or more lines and the predetermined wiring patterns of the plurality of the light-emitting device substrates are electrically connected with electrode-wiring terminal of the connecting substrate. [0286] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device substrate is a ceramic substrate, that is, the light-emitting device substrate of the lighting apparatus of the present invention is a ceramic substrate. [0287] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device is a light-emitting diode. [0288] More preferably, the lighting apparatus of the present invention is so arranged that a plurality of the light-emitting devices emit light in different colors from the others. [0289] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device is die-bonded to a predetermined position of the wiring pattern provided on the top surface of the light-emitting device substrate, and an electrode of the light-emitting device is wire-bonded to another predetermined position of the wiring pattern via a connecting wire. [0290] More preferably, the lighting apparatus of the present invention is so arranged that a concave section is provided on the surface of the light-emitting device substrate, the light-emitting device being die-bonded to a predetermined position of a wiring pattern provided within the concave section. [0291] More preferably, the lighting apparatus of the present invention is so arranged that the concave section includes a deeper concave section in a center section thereof, and a shallower concave section around the deeper concave section, and the light-emitting device is die-bonded to a predetermined position of a wiring pattern provided within said deeper concave section, whereas an electrode of said light-emitting device is wire-bonded to a predetermined position of a wiring pattern provided within said shallower concave section. [0292] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device is die-bonded to a predetermined position of a wiring pattern provided on a flat surface of the light-emitting device substrate. [0293] More preferably, the lighting apparatus of the present invention is so arranged that the light-transmitting section includes a lens means for preventing dispersion of light that is emitted from the light-emitting device. [0294] More preferably, the lighting apparatus of the present invention is so arranged that the light-transmitting section is a window section. [0295] More preferably, the lighting apparatus of the present invention is so arranged that the lens means is fitted in the window section so that the lens means is not protruded out above the top surface of the connecting substrate. [0296] More preferably, the lighting apparatus of the present invention is so arranged that the lens means is a micro lens. [0297] More preferably, the lighting apparatus of the present invention is so arranged that the micro lens mean includes the micro lens means includes: a transparent sheet member; and a plurality of the micro lenses on said transparent sheet member, the plurality of the micro lenses arranged in one or more lines. [0298] More preferably, the lighting apparatus of the present invention is so arranged that the connecting substrate is made of a transparent material having no color; and the lens means is incorporated in the connecting substrate. [0299] More preferably, the lighting apparatus of the present invention is so arranged that a periphery of the light-emitting device and a periphery of the connecting wire are molded with resin. [0300] More preferably, the lighting apparatus of the present invention is so arranged that at least the resin molding the periphery of the light-emitting device has a dorm-like shape and constitutes the lens means. [0301] More preferably, the lighting apparatus of the present invention is so arranged that the resin contains a fluorescer, which emits light in a desired color by being exited by the light emitted from the light-emitting device. [0302] More preferably, the lighting apparatus of the present invention is so arranged that the connecting substrate includes, on a surface thereof, a transparent sheet member containing a fluorescer, which emits light in a desired color by being exited by the light emitted from the light-emitting device, the surface being reverse to the surface that faces the light-emitting substrate. [0303] More preferably, the lighting apparatus of the present invention is so arranged that the light-emitting device emits light in a color in a blue or a ultra violet region. [0304] To achieve the object, a backlight apparatus of the present invention includes (i) any one of the foregoing light-emitting apparatuses, and (ii) a light guide plate whose light-receiving surface faces a light-emitting surface of said light-emitting apparatus, said light guide plate propagating therethrough light received on said light-receiving surface, and then emitting the light from a surface. [0305] To achieve the object, a display apparatus of the present invention may include a display panel having a pair of substrates, which sandwich a displaying medium therebetween, said display panel displaying by applying a display voltage between the substrates, a backlight apparatus provided on a bottom surface of said display panel. [0306] More preferably, the display panel of the present invention is a liquid crystal display panel in which the displaying medium is a liquid crystal layer sandwiched between the pair of the substrates, and said liquid crystal display panel displaying by changing orientation of a liquid crystal molecule in each of picture elements by applying a display voltage between the substrates, the picture elements being arranged in matrix. [0307] According to the foregoing arrangement, an effect of the present invention is explained below. [0308] In the arrangement of the present invention, there is only light-emitting device substrate (a ceramic substrate, for example) between a light-emitting device (such as a light-emitting diode chip; hereinafter referred as an “LED chip”) and a heat-discharging member (a radiator device; a heat-discharging element). In other words, the arrangement of the present invention is much simpler than an arrangement of a conventional art, in which a resin connecting substrate is further provided to these members. Therefore, according to the present invention, it is possible to more efficiently conduct heat to heat-discharging element from the LED chip. [0309] Further, in case where the light-emitting device substrate is, for example, a ceramic substrate having proper heat-conductivity, this allows heat to be conducted further efficiently to the heat-discharging element from the LED chip. [0310] Furthermore, a connecting substrate, which has a light-transmitting section such as a window section in that area of the connecting substrate which corresponds to an area that the light-emitting device is provided, is provided on the upper surface of light-emitting device substrate. On the account of this, the window section prevents light from dispersing; the incident angle of the light entering the light guide plate is prevented to be larger; and reflection from the light-receiving surface of the light guide plate is suppressed. Thereby, luminance of the display apparatus is improved. [0311] Here, explained is a problem to be solved for improving the efficiency in entering the light into the light guide plate, wire reference to the conventional art described above. [0312] In case where an LED lighting apparatus is used as a light source of an LCD backlight apparatus, light is directed from an LED element substrate 40A to a light guide plate 49. In this case, the light emitted from an LED chip 43 is radially dispersed, and enters the light-receiving surface of the light guide plate 49 at angles including not only the right angle but also non-orthogonal angles. On the account of this, the light is reflected in the light-receiving surface of the light guide plate 49, thereby raising a problem that efficiency of light entering the light guide plate 49 (in other words, efficiency of light reception in the light guide plate 49) decreases. [0313] Moreover, an LED display apparatus described in the above-mentioned Japanese Publication for Unexamined Patent Application No. 6-230731, is so arranged that no connecting wire is provided in a vicinity of a front of the light-emitting section, and that surface of the substrate from which transmission light exits is flat because LED chip is not provided on the surface, thereby obtaining good optical characteristic. However, in the arrangement, the efficiency of light entering the light guide plate from the LED chip is not taken into account. Therefore, there is a possibility that the problem of the efficiency of the light entering the light guide plate occurs in the arrangement, too. [0314] The present invention is made to solve the foregoing problem. According to the present invention, it is possible to more efficiently convey heat to the heat-discharging element from the LED chip with such a simple arrangement. Further, according to the present invention, efficiency of light entering the light guide plate from the LED chip increases, thereby improving luminance of the display apparatus. [0315] It is possible to attain better heat radiation efficiency and the efficiency in entering the light by the simple arrangement in which the light-emitting device mounting device is provided between the connecting substrate and the heat-discharging member in addition to the conventional arrangement in which the connecting substrate is provided between the light-emitting device mounting substrate and the heat-discharging member. [0316] Thereinafter, this is described in further details. [0317] In the arrangement of the present invention, an LED chip is die-bonded to a wiring pattern provided on a flat ceramic substrate or on a ceramic substrate provided with a concave section formed in a surface of the substrate. The LED chip is so die-bonded on the substrate that a surface of the LED which faces the ceramic substrate is a reverse surface of a light-emitting surface of the LED. A heat-discharging element such as a heatsink is bonded to that surface of the ceramic substrate which is reverse to a light-emitting surface of the ceramic substrate, or to one of side surfaces of the ceramic substrate. (The side surfaces of the ceramic substrate are the surfaces vertical to the light-emitting surface or the reverse surface of the ceramic substrate.) On the account of this, heat generated from the LED chip due to supply of electricity is conducted to the heat-discharging element only via the ceramic substrate and an adhesive agent that die-bonds the LED chip to the ceramic substrate. [0318] Meanwhile, the connecting substrate is provided on that surface of the ceramic substrate in which the light-emitting device is provided. Therefore, according to the arrangement, heat is more efficiently conducted than in the conventional arrangement in which sufficient heat discharge cannot be performed due to poor heat conduction caused by the resin substrate and the connecting substrate provided between the LED chip and the heat-discharging element. [0319] Electrode-wiring terminals are provided in areas near both edges of the upper surface of the ceramic substrate. The electrode-wiring terminals are connected to the connecting substrate by a solder or the like method. Furthermore, the heat-discharging element may be provided on at least any one of (i) the top surface of the ceramic substrate and (ii) the side surfaces of the ceramic substrate. [0320] According to the lighting apparatus of the present invention, heat-discharging efficiency is increased. Therefore, the lighting apparatus of the present invention is suitable for apparatuses driven by a large amount of electricity such as (i) a backlight apparatus and (ii) a variety of light sources for lighting apparatus. [0321] In case where the lighting apparatus of the present invention is used for a backlight apparatus, a lens mean (or a lens function element) which converts the radial light to the parallel light is provided in a position corresponding to a light-transmitting section such as a window section provided in the connecting substrate. This allows the light to enter the light-receiving surface of the light guide plate perpendicularly, thereby further improving efficiency in entering the light into the light guide plate. On the account of this, in a display apparatus in which the backlight apparatus is used, better luminance can be attained. [0322] The LED chip may be one LED chip or multiple LED chips having different colors respectively. In case where an LED has color which corresponds to blue or the ultra violet region, a fluorescer may be added in the molding resin. In case where the fluorescer is added, the fluorescer is excited by the light emitted from the LED chip, whereby a desired color is obtained. Moreover, the present invention may be so arranged that a transparent sheet member containing the fluorescer is provided on the reverse surface of the connecting substrate. The reverse surface is reverse to that surface of the connection substrate on which the LED chip is provided. Again in this arrangement, the fluorescer is excited by the light emitted from the LED chip, whereby a desired color is obtained. [0323] The concave section where the LED chip is provided may be constituted by two concave sections; a shallower concave section is provided so as to surround an aperture of a deeper concave section. This arrangement allows the wiring pattern provided on the surface of the shallower concave section to be wire-bonded to an electrode of the LED chip, thereby lessening amount of resin and lessening further stress when thermal stress is imposed, as in the arrangement described in Japanese Publication for Unexamined Patent Application No. 7-38154. [0324] As described above, according to the present invention, heat generated from the light-emitting device when the light-emitting device emits light is conducted directly to the heat-discharging element from the light-emitting device substrate—whereas in the conventional arrangement, the heat is conducted via the connecting substrate. This arrangement improves heat conduction. This enables display drive in which a large amount of electricity is used, thereby making it possible to improve luminance of the display apparatus. [0325] With this arrangement, thermal stress imposed on the light-emitting device is lessened, thereby improving reliability. Further, in case where the light-emitting device substrate is a ceramic substrate, instead of a resin substrate in the conventional arrangement, heat can be conducted more efficiently to the heat-discharging element from the light-emitting device. [0326] Also in the arrangement of the present invention, a connecting substrate having a light-transmitting section such as a window section provided in an area corresponding to the light-emitting device is provided on the upper surface of the light-emitting device substrate. The light passing through the window section will enter the light guide plate at a wide incident angle, thereby suppressing the reflection of the light from the light-entering surface of the light guide plate. This attains dramatic improvement in the efficiency in entering the light from the light-emitting device to the light guide plate, thereby attaining better display luminance. [0327] Further, the lens means provided in the window section of the connecting substrate or the like converts the light emitted from the light-emitting device, which is radial light, into the parallel light, thereby enabling the light to enter the light-receiving surface of the light guide plate vertically. On the account of this, efficiency of light entering the light guide plate is improved, thereby improving luminance of the display apparatus. [0328] Furthermore, according to the present invention, because the fluorescer is excited by that light, whose color corresponds to blue or the ultra violet region, emitted from the light-emitting device, a desired color can be obtained without using multiple light-emitting devices having different colors respectively. [0329] The invention being thus described, it will be obvious that the same way may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims. 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opto-electronic componentWO2013124420A1 *Feb 22, 2013Aug 29, 2013Osram Opto Semiconductors GmbhMethod for producing an optoelectronic component and optoelectronic component produced in such a way* Cited by examinerClassifications U.S. Classification372/36, 257/E25.02, 257/E33.072International ClassificationH01S5/00, G02F1/1335, H01L25/075, G02F1/13357, H01S3/04, H01L33/48, H01L33/46, H01L33/64, H01L33/62Cooperative ClassificationH01L24/45, H01L2924/00014, H05B33/089, H05B33/06, H01L2924/19105, H01L2224/48106, H01L33/64, H01L33/62, H01L33/56, H01L2924/12042, H01L25/167, H01L33/60, G02B6/0073, H01L2924/19041, H01L2224/48091, H01L24/48, H01L2924/14, H01L33/486, H01L2924/181, H01L2224/45144, H01L2924/12041, H01L33/46, H01L25/0753, H01L24/97, H01L2924/15787, H01L2924/351, H01L2224/48227, H01L33/641European ClassificationH01L25/075NLegal EventsDateCodeEventDescriptionApr 1, 2004ASAssignmentOwner name: SHARP KABUSHIKI KAISHA, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:INOGUCHI, TSUKASA;REEL/FRAME:015181/0222Effective date: 20040319Nov 12, 2004ASAssignmentOwner name: SHARP KABUSHIKI KAISHA, JAPANFree format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE S ADDRESS, PREVIOUSLY RECORDED AT REEL 015182, FRAME 0222;ASSIGNOR:INOGUCHI, TSUKASA;REEL/FRAME:015375/0842Effective date: 20040319Jan 30, 2013FPAYFee paymentYear of fee payment: 4RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services