Vertical gate thin film transistors in liquid crystal array

Details Vertical gate thin film transistors in liquid crystal array Vertical gate thin film transistors in liquid crystal array

1989-06-19

1990-08-14

James, Andrew J.

357 4, 357 234, 357 41, 357 45, 350334, H01L 2978

Patent

active

049491415

ABSTRACT:
Vertical gate thin film transistors are integrated into an actively addressable liquid crystal array to provide the switching function for charging each pixel element and any desired peripheral transistor circuitry. One of the conductive plates of each pixel of the array includes an extended portion. The address lines for the switching/charging transistors form a grid between the rows and columns of pixels and each intersection of the grid lies on an extended portion of a pixel element with the drain of the associated transistor formed directly on the extended portion. The source of the transistor is that portion of one set of address lines lying superjacent but insulated from the transistor drain. The gate of the transistor is that portion of the second set of address lines which is adjacent but insulated from the edges of the source and drain, lying essentially perpendicular to the substrate. Additional transistors for the peripheral circuitry are formed by the same process steps which form the pixel elements and the switching transistor.

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patent: 4807974 (1989-02-01), Hirai

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