Object-sensing device

An object-sensing device comprising:

• a waveguide that transmits radiation via total internal reflection from a first end to a second end;
• a radiation emitting element positioned at a first end of the waveguide;
• and
• a radiation receiving element positioned at a second end of the waveguide, wherein edges of the waveguide that do not correspond to the first end or the second end are free of radiation emitting element and radiation receiving element.

An object-sensing display device comprising:

• a waveguide that transmits radiation via total internal reflection from a first end to a second end;
• a radiation emitting element positioned at a first end of the waveguide;
• a radiation receiving element positioned at a second end of the waveguide, wherein edges of the waveguide that do not correspond to the first end or the second end are free of radiation emitting element and radiation receiving element;
• a common electrode formed on the waveguide;
• a thin film transistor array substrate having pixel electrodes formed thereon disposed on the common electrode with a liquid crystal layer between the pixel electrodes and the common electrode.