Visible-light blocking member, infrared sensor including the visible-light blocking member, and liquid crystal display device including the infrared sensor

An infrared sensor, comprising:

• a visible-light blocking member as a structure comprising amorphous germanium or a compound of amorphous germanium having higher transmittance for a wavelength of an infrared ray region than for a wavelength of a visible light region;
• an insulating layer disposed under the visible-light blocking member;
• an active layer overlapping with the visible-light blocking member and disposed under the insulating layer;
• an ohmic contact layer disposed under the active layer;
• a source electrode disposed under the ohmic contact layer;
• a drain electrode separated from the source electrode and disposed under the ohmic contact layer;
• a gate insulating layer disposed under the active layer, the source electrode, and the drain electrode;
• and
• a gate electrode overlapping with the active layer and disposed under the gate insulating layer.

A liquid crystal display, comprising:

• a lower panel comprising a pixel transistor;
• a liquid crystal layer disposed on the lower panel;
• and
• an upper panel comprising at least one infrared sensor disposed on the liquid crystal layer,
• wherein the infrared sensor comprises a visible-light blocking member as a structure comprising amorphous germanium or a compound of amorphous germanium having higher transmittance for a wavelength of an infrared ray region than for a wavelength of a visible light region.