Patent ID: 7842952

Claim:
An inverter, comprising: a load transistor including a gate electrode, source and drain electrodes, a load insulating layer formed on the gate electrode, the source electrode being connected to the gate electrode, and an organic semiconductor layer formed on the load insulating layer; a driver transistor connected to the load transistor and including a gate electrode, source and drain electrodes, a driver insulating layer formed on the gate electrode, and an organic semiconductor layer formed on the load insulating layer, wherein the drain electrode of the driver transistor is directly connected to the gate electrode of the load transistor, and a surface-treated layer formed on a predetermined insulating layer, the predetermined insulating layer being one of the load insulating layer and the driver insulating layer, such that the driver transistor is a depletion-type transistor and the load transistor is an enhancement-type transistor, wherein the load transistor and the driver transistor have substantially the same W/L ratio.