MEMS devices with multi-component sacrificial layers
First Claim
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1. A pre-release structure for forming an electromechanical device, the pre-release structure comprising:
- a substrate;
a mirror layer positioned over the substrate;
a partially transparent layer positioned over the substrate and spaced from the mirror layer; and
a composite layer disposed between the mirror and the partially transparent layer, the composite layer comprising a mixture of a sacrificial material and a second material different from the sacrificial material, the sacrificial material being selectively removable relative to the second material.
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Abstract
Methods of forming a protective coating on one or more surfaces of a microelectromechanical device are disclosed comprising the steps of forming a composite layer of a sacrificial material and a protective material, and selectively etching the sacrificial material to form a protective coating. The protective coatings of the invention preferably improve one or more aspects of the performance of the microelectromechanical devices in which they are incorporated. Also disclosed are microelectromechanical devices formed by methods of the invention, and visual display devices incorporating such devices.
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Citations
31 Claims
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1. A pre-release structure for forming an electromechanical device, the pre-release structure comprising:
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a substrate; a mirror layer positioned over the substrate; a partially transparent layer positioned over the substrate and spaced from the mirror layer; and a composite layer disposed between the mirror and the partially transparent layer, the composite layer comprising a mixture of a sacrificial material and a second material different from the sacrificial material, the sacrificial material being selectively removable relative to the second material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A pre-release structure for forming an electromechanical device, the pre-release structure comprising:
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a substrate; a mirror layer positioned over the substrate; a partially transparent layer positioned over the substrate and spaced from the mirror layer; a first sacrificial layer positioned over the partially transparent layer; and a second sacrificial layer positioned over the first sacrificial layer, at least one of the first and second sacrificial layers comprising a composite layer, the composite layer comprising a mixture of a sacrificial material and a second material different from the sacrificial material, the sacrificial material being selectively removable relative to the second material. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification