Light-emitting display device having light emitting elements surrounded by black ceramic

Claim 2

A LIGHT-EMITTING DISPLAY DEVICE WHEREIN METALLIC INTERCONNECTION LAYERS ARE FORMED ON A CERAMIC SUBSTRATE WITH CERAMIC INSULATING LAYERS AND WHEREIN LIGHT-EMITTING ELEMENTS AND ELECTRODE TERMINALS THEREOF ARE CONNECTED TO PARTS OF SAID METALLIC INTERCONNECTION LAYERS, CHARACTERIZED IN THAT AT LEAST MAIN PARTS OF SAID METALLIC INTERCONNECTION LAYERS ARE INSULATED BY A WHITE CERAMIC LAYER, AND THAT A BACKGROUND PORTION OF SAID LIGHT-EMITTING ELEMENTS IS FORMED OF A BLACK CERAMIC LAYER.

Claim 3

The light-emitting display device as defined in claim 1, characterized in that said main parts of said metallic interconnection layers are formed with white ceramic insulating layers, and that only an uppermost metallic interconnection layer to which the light-emitting elements and their electrode terminals are connected is formed with a black ceramic layer as an insulating layer.

Claim 4

The light-emitting display device as defined in claim 1, characterized in that uppermost layers of multi-layer interconnections, to which the light-emitting elements and their electrode teRminals are connected, are formed on a white ceramic insulating layer, and that a black ceramic layer is formed on parts of said last-mentioned white ceramic insulating layer on which said uppermost layers of the multi-layer interconnections are not formed.

Claim 5

The light-emitting display device as defined in claim 1, characterized in that the metallic interconnection layers are formed on the ceramic substrate, that white ceramic insulating layers are formed on that part of an uppermost metallic interconnection layer which is other than bonding portions of said uppermost interconnection layer connected to the light-emitting elements and their electrode terminals, and that a black ceramic layer is formed on said white ceramic layers.

Claim 6

A light-emitting display device comprising: a ceramic substrate; a plurality of metallic interconnection layers separated from each other and disposed on a principal surface of said substrate; light-emitting diode elements disposed on selected ones of said metallic interconnection layers; white ceramic insulator layer portions disposed on said substrate between individual ones of said metallic interconnection layers; conductor wires respectively connected between said light-emitting diode elements and prescribed ones of said interconnection layers other than said selected ones, and black ceramic layer portions disposed on those white ceramic insulator layer portions which are at least adjacent said light-emitting diode elements.

Claim 7

A light-emitting display device comprising: a ceramic substrate; a plurality of metallic interconnection layers separated from each other and disposed on a principal surface of said substrate; light-emitting diode elements disposed on selected ones of said metallic interconnection layers; white ceramic insulator layer portions disposed on said substrate between individual ones of said metallic interconnection layers; conductor wires respectively connected between said light-emitting diode elements and prescribed ones of said interconnection layers other than said selected ones, and black ceramic layer portions disposed on those white ceramic insulator layer portions which are at least adjacent said light-emitting diode elements.

Claim 8

A light-emitting device according to claim 5, wherein said conductor wires extend over black ceramic layer portions disposed between those metallic interconnection layers on which said diode elements are disposed and those interconnection layers to which said wires are connected.

Claim 9

A light-emitting device according to claim 5, wherein said white ceramic insluator layer portions comprise a stack of successively arranged white ceramic insulator layers disposed on the surface of said substrate, said black ceramic layer portions are disposed on the surface of the uppermost white ceramic insulating layer, and said interconnection layers, on which said diode elements are disposed and to which said wires are connected, extend from said principal surface of said substrate to the upper surface of said black ceramic layer portions through said white ceramic insulator layers.

Claim 10

A light-emitting device according to claim 5, wherein said white ceramic insulator layer portions comprise a layer of a white ceramic insulator material disposed on said substrate, said interconnection layers to which said diode elements and said conductor wires are contacted, extend from the principal surface of said substrate to the upper surface of said layer of white ceramic insulator material through the last-mentioned layer, and said black ceramic layer portions are disposed on those upper surface portions of said white ceramic insulator layer other than the portions on which interconnection layers are disposed.

Claim 11

A light-emitting device according to claim 5, wherein said white ceramic layer portions are disposed on said substrate between each of said interconnection layer portions and each of said white ceramic layer portions has its upper surface covered by a layer of black ceramic material.

Claim 12

A light-emitting device according to claim 5, wherein each interconnection layer to which a conductor wire is connected and on which a diode element is disposed is spaced from a black ceramic layer portion disposed therebetween.

Claim 13

A light-emitting device according to claim 5, wherein said black ceramic layer contains prescribed amounts of Al2O3, SiO2, MgO and TiO2.

Claim 14

A light-emitting device according to claim 11, wherein the amount of TiO2 in said black ceramic layer is from 1 to 10 percent by weight.

Claim 15

A light-emitting device according to claim 12, wherein the amount of TiO2 in said black ceramic layer is from 1 to 4 percent by weight.