Patent ID: 7470931
Filing Date: 2008-12-30
Classification: G02F,H01L

Abstract:
1. A thin film transistor, comprising: a gate electrode; a source electrode and a drain electrode; an organic semiconductor layer insulated from the gate electrode and contacting the source electrode and the drain electrode; and a gate insulating layer insulating the source electrode and the drain electrode from the gate electrode, wherein: a first capacitance is a capacitance at a first point per unit area where the organic semiconductor layer, one of the source electrode and the drain electrode, and the gate insulating layer contact one another, a second capacitance is a capacitance at a second point per unit area where the organic semiconductor layer contacts the gate insulating layer, a third capacitance is a capacitance at a third point per unit area where the one of the source electrode and the drain electrode contacts the gate insulating layer, a fourth capacitance is a capacitance at a fourth point per unit area where the organic semiconductor layer contacts the one of the source electrode and the drain electrode, the first capacitance is greater than one of the second capacitance, the third capacitance, and the fourth capacitance, and wherein a first dielectric constant of a first portion of the gate insulating layer below the first point is greater than one of a second dielectric constant of a second portion of the gate insulating layer below the second point and a third dielectric constant of a third portion of the gate insulating layer below the third point.