Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1993-01-19
1996-02-13
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 80, 359 81, 359 88, 257350, G02F 1136, G02F 11339, H01L 2712
Patent
active
054915716
ABSTRACT:
A silicon dioxide etch stop layer (30) is formed on an inner surface (28b) of a monocrystalline silicon layer (28), and a silicon carrier wafer (52) is bonded to the etch stop layer. The exposed inner surface (28a) of the monocrystalline layer (28) is uniformly thinned to approximately 4 micrometers. Front electrodes (20) in the form of heavily doped areas, and microelectronic transistor driver devices (42) for the electrodes (20) are integrally formed on the outer surface (28a) of the monocrystalline layer (28). A front plate (12) is bonded to the outer surface (28a) of the monocrystalline layer (28), and the carrier (52) is removed. The central portion of the etch stop layer (30) is removed from the inner surface (28b) of the monocrystalline layer (28), and the exposed central portion (28c) of the layer (28) is uniformly thinned to approximately 400 angstroms using plasma assisted chemical etching. A back plate (14 ) having a back electrode (16) formed thereon is adhered to the unetched peripheral portion (28d) of the inner surface (28b) of the monocrystalline layer (28) to define a sealed space (24) between the front and back electrodes (12,14) which is filled with liquid crystal material (26). Large scale integrated driver circuitry (38,40) is fabricated in the peripheral portion (28d) of the layer (28) laterally external of the back plate (14) and externally interconnected by via holes (28g,28h) and wirebonds (44,45).
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Marsh Ogden J.
Shields Steven E.
Williams Ronald L.
Denson-Low W. K.
Duong Tai
Hughes Aircraft Company
Lachman M. E.
Sales M. W.
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