Thin film semiconductor device and liquid crystal display appara

Details Thin film semiconductor device and liquid crystal display appara Thin film semiconductor device and liquid crystal display appara

1989-04-28

1991-09-24

Mintel, William

357 237, 357 2, 350339R, 350342, 350338, 350336, H01L 2714

Patent

active

050518003

ABSTRACT:
A thin film semiconductor device and a liquid crystal display apparatus is provided wherein the thin film semiconductor device having light irradiated thereon is cut off by a conductor layer, and the light can be prevented from reaching the semiconductor layer. As a result, the generation of carriers due to optical excitation does not occur and the off current of the device can be reduced. Because there is no area where the electric field intensity in an opposed direction to the source electrode and the drain electrode is weaker than the electric field intensity of the channel region in the semiconductor layer, even after operating the device for a prolonged duration under the irradiation of light, carriers generated by optical excitation are not accumulated in the semiconductor layer, and the probability of trapping the carriers into a gate insulating film is quite low, and therefore variations in the characteristics of the thin film semiconductor device are negligibly small. The liquid crystal display apparatus using the thin film semiconductor can restrict such deteriorations of display quality such as the degradation of contrast and uniformity.

REFERENCES:
patent: 4065781 (1977-12-01), Gutknecht
patent: 4425572 (1984-01-01), Takafuji et al.
patent: 4599246 (1986-07-01), Harajiri et al.
patent: 4601097 (1986-07-01), Shimbo
patent: 4822751 (1989-04-01), Ishizu et al.

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