Photosensitive device and two frequency driving method thereof

A method for operating an electronic device which uses a material having a photoconductive effect, a trap level for trapping an excited carrier, and an energy band gap, said method comprising:

• illuminating the material with a first light, the first light having a wavelength corresponding to an energy higher than the energy band gap of the material;
• illuminating the material with a second light, the second light having a wavelength corresponding to an energy lower than the energy band gap of the material;
• and
• obtaining information on the first light by measuring the quantity of second light transmitted through the material.

An electronic device comprising:

• a material having an energy band gap;
• means for writing information into the material using a light having a wavelength corresponding to an energy higher than the energy band gap of the material;
• and
• means for detecting the information in accordance with a quantity of a transmitted light when a light having a wavelength corresponding to an energy lower than the energy band gap of the material is transmitted through the material.

An electronic device comprising:

• a material having an energy band gap;
• and
• means for detecting at least one of a first information of whether or not a writing light is irradiated to the material, a second information with respect to a change in a quantity of the writing light, and a third information with respect to a change in a wavelength of the writing light, in accordance with a quantity of a reading light transmitted through the material,
• wherein the writing light has a wavelength corresponding to an energy higher than the energy band gap of the material and the reading light has a wavelength corresponding to an energy lower than the energy band gap of the material.