Sensing device and method of sensing a light by using the same

A sensing device comprising:

• a lower panel including a lower substrate and a pixel transistor disposed on the lower substrate;
• a liquid crystal layer disposed on the lower panel;
• and
• an upper panel disposed on the liquid crystal layer and including an upper substrate having a first surface facing a direction where an object to be sensed would be positioned and an opposite surface facing the liquid crystal layer, an infrared ray sensor, a visible ray sensor, and a readout transistor connected to the infrared ray sensor or the visible ray sensor for transmitting a detection signal to a readout line, and wherein the infrared ray sensor includes a visible ray blocking film contacting the opposite surface, an insulating layer covering and contacting the visible ray blocking film, an active layer disposed on and contacting the insulating layer, a source and drain electrode, each contacting the active layer, the insulating layer and the opposite surface

A method for sensing light by using a sensing device, comprising:

• providing a sensing device including an upper substrate having a first surface facing an object to be sensed and a second surface opposite the first surface, an infrared ray sensor and a visible ray sensor, the infrared ray sensor including a visible ray blocking film contacting the opposite surface, an insulating layer covering and contacting the visible ray blocking film, an active layer disposed on and contacting the insulating layer, a source and drain electrode, each contacting the active layer, the insulating layer and the opposite surface;
• emitting an infrared ray and a visible ray from the sensing device;
• disposing the object close to the upper substrate of the sensing device;
• and
• sensing the infrared ray or the visible ray reflected by the object through the infrared ray sensor or the visible ray sensor, thereby obtaining information of the object.