Lg Display Co., Ltd.

Hoon Yim

Dae-Hwan Kim

Sul Lee

DaeHwan Kim

Byung-Kook Choi

Byungkook Choi

An oxide thin film transistor (TFT) and a fabrication method thereof are provided. The method for fabricating an oxide thin film transistor (TFT) comprises: forming a gate electrode on a substrate; forming a gate insulating layer on the substrate with the gate electrode formed thereon; forming an active layer made of oxide semiconductor on the gate insulating layer; forming a contact layer on the substrate with the active layer formed thereon and forming source and drain electrodes, which are electrically connected with source and drain regions of the active layer through the contact layer, on the contact layer; forming a protective layer on the substrate with the source and drain electrodes formed thereon; forming a contact hole by removing the protective layer to expose the drain electrode; and forming a pixel electrode electrically connected with the drain electrode through the contact hole, wherein the contact layer is made of oxide including a different metal or conductivity with that of the source and drain electrodes, to adjust a threshold voltage according to the difference in a work function.

Oxide thin film transistor and method of fabricating the same

The present disclosure relates to a thin film transistor substrate for flat panel display device including oxide semiconductor. The present disclosure suggests a thin film transistor substrate for flat panel display device comprising: a transparent substrate; a thin film transistor layer having an oxide semiconductor material disposed on the transparent substrate; a passivation layer disposed on the whole surface of the thin film transistor layer; a pixel electrode formed on the passivation layer and contact the thin film transistor layer through a contact hole formed at the passivation layer; and a first ultra violet light absorbing layer disposed on the whole surface of the pixel electrode. Absorbing all of ultra violet light and passing all of the visible light, the photo-thermal characteristic is enhanced and the transparency property is not degraded.

Thin film transistor susbtrate including oxide semiconductor

A method for fabricating an oxide thin film transistor includes sequentially forming a gate insulating film, an oxide semiconductor layer, and a first insulating layer; selectively patterning the oxide semiconductor layer and the first insulating layer to form an active layer and an insulating layer pattern on the gate electrode; forming a second insulating layer on the substrate having the active layer and the insulating layer pattern formed thereon; and selectively patterning the insulating layer pattern and the second insulating layer to form first and second etch stoppers on the active layer. The oxide semiconductor layer may be a ternary system or quaternary system oxide semiconductor comprising a combination of AxByCzO (A, B, C=Zn, Cd, Ga, In, Sn, Hf, Zr; x, y, z&#x2267;0).

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Paju, South Korea

Hoon Yim