LIQUID CRYSTAL DISPLAY DEVICE WITH BUILT-IN DRIVING CIRCUIT

摘要

PURPOSE:To simplify circuit constitution and to improve performance by using picture element switching transistors and transistors of reverse conduction type to the whole or part of transistors constituting a driving circuit and recrystallizing the channel region thereof by laser annealing, etc. CONSTITUTION:The channel regions (for example, amorphous silicon) 2 are selectively formed on a substrate 1 and are then subjected to recrystallization such as laser annealing to selectively form thin film layers 3 contg. a P type impurity for the purpose of contact. A gate insulating film (for example, low temp. grown insulating film) 4 is deposited and is opened with contact holes; thereafter, source electrodes and drain electrodes 5 and gate electrodes 6 are selectively formed. The P type TFT formed in such a manner is the TR of an enhancement type.