Display device

A display device, comprising:

• a first substrate;
• a first electrode and a second electrode both mounted on the first substrate;
• a second substrate arranged to face the first substrate with a gap provided between the first substrate and the second substrate;
• a third electrode mounted on the second substrate;
• a first layer formed in a gap between the first substrate and the second substrate at the side of the first substrate and containing a ECL material that emits light due to electrochemical oxidation or reduction;
• a second layer formed in the gap between the first substrate and the second substrate at the side of the second substrate and containing a EC material having the color changed due to an electrochemical oxidation or reduction;
• an AC voltage source which applies an AC voltage between the first substrate and the second electrode so as to generate an AC electric field within the first layer;
• a DC voltage source which applies a DC potential to the third electrode so as to generate a DC electric field within the second layer;
• and
• a control section configured to selectively energize the AC voltage source and the DC voltage source so as to cause the first layer to emit light rays under the AC electric field and to cause the second layer to develop a color under the DC electric field.

A method of driving a display device, the display device comprising:

• a first substrate;
• a first electrode and a second electrode both mounted on the first substrate;
• a second substrate arranged to face the first substrate with a gap provided therebetween;
• a third electrode mounted on the second substrate;
• a first layer arranged in a gap between the first substrate and the second substrate at the side of the first substrate and containing a ECL material that emits light as a result of an electrochemical oxidation or reduction;
• and
• a second layer arranged in a gap between the first substrate and the second substrate at the side of the second substrate and containing a EC material having the color changed as a result of an electrochemical oxidation or reduction;
• the driving method comprising:
• selecting the light-emitting display mode and the light-reflecting display mode;
• applying an AC voltage between the first electrode and the second electrode during the light-emitting display mode so as to generate an AC electric field within the first layer and, thus, to permit the first layer to emit light;
• and
• applying a DC potential to the third electrode during the light-reflecting display mode so as to generate a DC electric field within the second layer and, thus, to color the second layer.