Patent ID: 6346978
Filing Date: 2002-02-12
Classification: G02F

Abstract:
A method of forming liquid crystal displays (LCDs) for projection display, comprising:forming, on a wafer of substantially single-crystal silicon which includes a buried insulating layer extending between top and bottom layer of silicon, one or more LCD arrays, the LCD arrays being formed on the wafer by steps which include: in each of one or more regions of the wafer, forming a pixel array including a plurality of pixel structures each of which selectively controls light transmissivity through a subregion of a LCD; and in each said region of the wafer, forming a LCD driver and operative connections between the driver and said pixel structures; and; on the other side of the wafer in each said region, removing substantially all of the bottom silicon layer from beneath the pixel structures, whereby the wafer cross section where the pixel structures are formed consists of said top layer with the pixel structures formed thereon, and said buried insulating layer; removing a portion of the buried insulating layer to select a final thickness for the buried insulating layer; separating each said region from other areas of the wafer, each said region forming a first substrate of the LCD; for each said first substrate formed, providing a second substrate spaced apart from said first substrate; and providing liquid crystal material between the first and second substrates to form one or more LCDs, in each LCD said second substrate operating cooperatively with the LCD array on said first substrate to control light transmission through said first and second substrates and through subregions of the liquid crystal material, whereby selective control of light transmission through subregions of the LCD controls the projection display.