Patent ID: 8174015

Claim:
A display device, comprising: a panel comprising an upper substrate and a lower substrate, and a pixel transistor formed on the lower substrate, wherein the upper substrate is facing the lower substrate and an infrared ray sensing transistor and a readout transistor being connected to the infrared ray sensing transistor are provided on the upper substrate, and the readout transistor is provided to transmit a signal and wherein, the readout transistor comprises a first lower gate electrode formed on the upper substrate, a first semiconductor layer overlapping the first lower gate electrode and formed on the first lower gate electrode, and a first source electrode and a first drain electrode formed on the first semiconductor layer and wherein, the infrared ray sensing transistor comprises a light blocking film and a second lower gate electrode formed on the upper substrate, the second lower gate coupled to the light blocking film, a second semiconductor layer overlapping the light blocking film formed on the second lower gate electrode, a second source electrode and a second drain electrode formed on the second semiconductor layer, and a second upper gate electrode overlapping the second semiconductor layer formed on the second source electrode and the second drain electrode.