Display device including optical sensor and driving method thereof

A display device comprising:

• a first substrate, wherein a terminal portion, a switching transistor, a first optical sensor, a second optical sensor, an optical sensor control circuit, a pixel portion and a driver circuit are provided on the first substrate,
• a second substrate provided with a counter electrode, the second substrate facing with the first substrate,
• wherein the first optical sensor includes a first photoelectric conversion element including an amorphous semiconductor, and a first amplifier circuit,
• wherein the second optical sensor includes a second photoelectric conversion element including a polycrystalline semiconductor, and a second amplifier circuit,
• wherein the counter electrode is electrically connected to the terminal portion through the switching transistor,
• wherein the first optical sensor detects visible light, and
• wherein the second optical sensor detects visible light and infrared light.

A display device comprising:

• a first substrate, wherein a terminal portion, a switching transistor, a first optical sensor, a second optical sensor, an optical sensor control circuit, a pixel portion and a driver circuit are provided on the first substrate,
• a second substrate provided with a counter electrode, the second substrate facing with the first substrate,
• wherein the first optical sensor includes a first photoelectric conversion element including an amorphous semiconductor, and a first amplifier circuit,
• wherein the second optical sensor includes a second photoelectric conversion element including a polycrystalline semiconductor, and a second amplifier circuit,
• wherein the counter electrode is electrically connected to the terminal portion through the switching transistor,
• wherein the first optical sensor detects visible light and has a maximum sensitivity at a wavelength of approximately 0.6 μm, and
• wherein the second optical sensor detects visible light and infrared light and has a maximum sensitivity at a wavelength of approximately 0.7 μm.