Light-emitting apparatus package, light-emitting apparatus, backlight apparatus, and display apparatus
A 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 section formed within the first concave section in the further direction of thickness of the ceramic substrate so that one or more light-emitting devices are provided therein, (iv) a wiring pattern for supplying electricity, which is provided in the first concave section, and (v) a metalized layer having light-reflectivity, which is (a) provided between the light-emitting device and the surface of the second concave section of the substrate, and (b) electrically insulated from the wiring pattern. On the account of this, the light-emitting apparatus package in which heat is excellently discharged and light is efficiently utilized and a light-emitting apparatus in which the light-emitting apparatus package is used can be obtained.
1. A light-emitting apparatus package, comprising:
a ceramic substrate comprising two or more ceramic layers having an electric insulating property and a good heat conductivity;
a first concave section recessed in a thickness direction of the ceramic substrate, the first concave section providing a light exit aperture on a surface of the ceramic substrate;
a second concave section, provided in the first concave section, and further recessed in the thickness direction of the ceramic substrate such that both axes of symmetry for the first concave section and the second concave section are substantially coaxial, the second concave section arranged to provide an area for mounting a light-emitting device on a bottom surface of the second concave section;
a wiring pattern provided on a peripheral surface of the ceramic substrate of at least one of the first concave section or the second concave section, the wiring pattern extending through the ceramic substrate to electrically connect to an external connection terminal separated from the wiring pattern on the surface of the ceramic substrate, the wiring pattern being operable to supply electricity to the light-emitting device; and
a metalized layer provided on and in direct contact with at least a part of the bottom surface and a side surface of the second concave section in such a manner that the metalized layer is electrically insulated from the wiring pattern, the metalized layer having a light reflective property.
2. The light-emitting apparatus package as set forth in claim 1 , wherein:
the metalized layer is exposed within the second concave section.
3. The light-emitting apparatus package as set forth in claim 1 , wherein:
the ceramic substrate contains aluminum nitride.
4. The light emitting apparatus package as set forth in claim 1 , wherein:
the ceramic substrate has a resistance of not less than 10 10 (Ω·cm) and has a heat conductivity of not less than 18 (W/m·k).