Glass lid, and package provided with such a lid, for the encapsulation of electronic components
View Patent ↗The encapsulation lid comprises at least two glass layers of different compositions, a first layer called the bottom layer, which is continuous, and at least a second layer, which is discontinuous and designed so as to define cavities or anfractuosities in this lid. Preferably, the glass layers other than the first layer are preferably formed from low-melting-point frits, thereby allowing such lids to be manufactured economically, without recourse to glass machining.
1. Gas-tight package containing electronic or electrooptic components, comprising a substrate supporting the said components, a glass encapsulation lid applied to the substrate supporting the electronic or electrooptic components, and a seal placed at least around the periphery of the glass encapsulation lid and of the said substrate, so as to hermetically join the glass encapsulation lid to the substrate and to isolate the said components from the gas of the atmosphere, wherein the said lid comprises at least two glass layers of different compositions, a first layer called the bottom layer, which is continuous, and at least a second layer, which is discontinuous and designed so as to define cavities or anfractuosities in the said lid and inside the said package, designed also to form a peripheral glass projection, the said first layer forming the bottom of the said cavities or anfractuosities made in the said second layer, and wherein the said seal is applied to a top surface of the peripheral projection, and is made of an organic material and has a mean thickness less than 100 μm.
2. Gas-tight package according to claim 1 , wherein the softening temperature of the glass of the at least second layer is below the softening temperature of the glass of the said bottom layer.
3. Gas-tight package according to claim 2 , wherein the softening temperature of the at least second layer does not exceed 550° C.
4. Gas-tight package according to claim 1 , wherein the said first layer is plane and of uniform thickness.
5. Gas-tight package according to claim 1 , wherein the said substrate is made of glass and wherein the composition of this glass is identical to that of the said first, bottom layer of the said lid.
6. Gas-tight package according to claim 1 , wherein the said electronic or electrooptic components comprise organic light-emitting diodes.
7. Gas-tight package according to claim 1 , wherein the said electronic or electrooptic components comprise active matrix circuits.
8. Gas-tight package according to claim 1 wherein the mean thickness of the seal is between 10 μm and 20 μm.