Light emitting device, driving method for the same and electronic apparatus

A light-emitting device comprising:

• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• an OLED;
• a power line;
• a signal line;
• a first scanning line;
• and
• a second scanning line,
• wherein gate electrodes of said third and fourth transistors are both connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, and
• wherein a gate electrode of said second transistor is connected to said second scanning line.

A light-emitting device comprising:

• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• an OLED;
• a power line;
• a signal line;
• and
• a scanning line,
• wherein gate electrodes of said second, third and fourth transistors are all connected to said scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line, and
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED.

A light-emitting device comprising:

• a first transistor;
• a second transistor;
• a third transistor;
• a fourth transistor;
• a fifth transistor;
• an OLED;
• a power line;
• a signal line;
• a first scanning line;
• and
• a second scanning line,
• wherein gate electrodes of said second, third and fourth transistors are all connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED,
• wherein a gate electrode of said fifth transistor is connected to said second scanning line, and
• wherein one of source and drain region of said fifth transistor is connected to said power line and the other to the gate electrode of said first transistor.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line and a scanning line,

• wherein gate electrodes of said third and fourth transistors are both connected to said scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, the method for driving said light emitting device comprising:
• providing a first period in which said third and fourth transistors are on and a second period in which said third and fourth transistors are off in one frame period, wherein said second transistor is off in the first period and on in the second period;
• and
• controlling a drain current of said first transistor in magnitude in the first period by an analog video signal in order to control a brightness of said OLED.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line, a first scanning line and a second scanning line,

• wherein gate electrodes of said third and fourth transistors are both connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, and
• wherein a gate electrode of said second transistor is connected to said second scanning line, the method for driving said light emitting device comprising:
• providing a first period in which said third and fourth transistors are on and a second period in which said third and fourth transistors are off in one frame period, wherein said second transistor is off in the first period and on in the second period;
• and
• controlling a drain current of said first transistor in magnitude in the first period by an analog video signal in order to control a brightness of said OLED.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line and a scanning line,

• wherein gate electrodes of said second, third and fourth transistors are all connected to said scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor being connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, the method for driving a light emitting device comprising:
• providing a first period in which said third and fourth transistors are on and a second period in which said third and fourth transistors are off in one frame period, wherein said second transistor is off in the first period and on in the second period;
• and
• controlling a drain current of said first transistor in magnitude in the first period by an analog video signal in order to control a brightness of said OLED.

A method for driving light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, an OLED, a power line, a signal line, a first scanning line and a second scanning line,

• wherein gate electrodes of said second, third and fourth transistors are all connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED,
• wherein a gate electrode of said fifth transistor is connected to said second scanning line, and
• wherein one of source and drain regions of said fifth transistor is connected to said power line and the other to the gate electrode of said first transistor, the method for driving said light emitting device comprising:
• providing a first period in which said third and fourth transistors are on and said fifth transistor is off, a second period in which said third and fourth transistors are off and said fifth transistor is off, and a third period in which said third and fourth transistors are off and said fifth transistor is on, wherein said second transistor is off in the first period, on in the second period and on in the third period;
• and
• controlling a drain current of said first transistor in magnitude in the first period by an analog video signal in order to control a brightness of said OLED.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line and a scanning line,

• wherein gate electrodes of said third and fourth transistors are both connected to said scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, the method for driving said light emitting device comprising:
• providing a first period and a second period corresponding to respective bits of a digital video signal in one frame period, wherein in the first period, said third and fourth transistors are on and said second transistor is off and in the second period, said third and fourth transistors are off and said second transistor is on;
• and
• controlling said OLED in a presence or an absence of light emission in the first period on the basis of information possessed by each bit of a corresponding one of the digital video signal.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line, a first scanning line and a second scanning line,

• wherein gate electrodes of said third and fourth transistors are both connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED,
• wherein a gate electrode of said second transistor is connected to said second scanning line, the method for driving said light emitting device comprising:
• providing a first period and a second period corresponding to respective bits of a digital video signal in one frame period, wherein in the first period, said third and fourth transistors are on and said second transistor off and in the second period, said third and fourth transistors are off and said second transistor is on;
• and
• controlling said OLED in a presence or an absence of light emission in the first period on the basis of information possessed by each bit of a corresponding one of the digital video signal.

A method for driving a light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, an OLED, a power line, a signal line and a scanning line,

• wherein gate electrodes of said second, third and fourth transistors are all connected to said scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line, and
• wherein one of source and drain regions of said second transistor is connected to the drain region of said first transistor and the other to a pixel electrode of said OLED, the method for driving a light emitting device comprising:
• providing a first period and a second period corresponding to respective bits of a digital video signal in one frame period, wherein in the first period, said third and fourth transistors are on and said second transistor is off and in the second period, said third and fourth transistors are off and said second transistor is on;
• and
• controlling said OLED in a presence or an absence of light emission in the first period on the basis of information possessed by each bit of a corresponding one of the digital video signal.

A method for driving light-emitting device comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, an OLED, a power line, a signal line, a first scanning line and a second scanning line,

• wherein gate electrodes of said second, third and fourth transistors are all connected to said first scanning line,
• wherein one of source and drain regions of said third transistor is connected to said signal line and the other to a gate electrode of said first transistor,
• wherein one of source and drain regions of said fourth transistor is connected to said signal line and the other to a drain region of said first transistor,
• wherein a source region of said first transistor is connected to said power line,
• wherein one of source and drain regions of said second transistor being connected to the drain region of said first transistor and the other to a pixel electrode of said OLED,
• wherein a gate electrode of said fifth transistor is connected to said second scanning line, and
• wherein one of source and drain region of said fifth transistor is connected to said power line and the other to the gate electrode of said first transistor, the method for driving said light emitting device comprising:
• providing a first period, a second period and a third period corresponding to respective bits of a digital video signal in one frame period, wherein in the first period, said third and fourth transistors are on and said second and fifth transistors are off, in the second period, said third and fourth transistors are off, said second transistor is on, and said fifth transistor is off, and in the third period, said third and fourth transistors are off, said second transistor is on, and said fifth transistor is on;
• and
• controlling said OLED in a presence or an absence of light emission in the first period on the basis of information possessed by each bit of a corresponding one of the digital video signal.