Light Emitting Device and Method for Driving Thereof

A method for driving a display device including a plurality of pixels arranged in a matrix form, a plurality of source signal lines inputting a video signal in the plurality of pixels, and a source driver outputting a signal to each of the plurality of source signal lines, wherein the source driver includes a shift register and an image signal input line to which a video signal is input, the method comprising:

• determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another;
• in a case where video signals corresponding to at least two pixels of the video signals corresponding to the pixels in one row of the plurality of pixels are different from each other, sequentially outputting video signals input to the image signal input line to the plurality of source signal lines in synchronization with a sampling pulse output from the shift register;
• and
• in a case where the signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, stopping input of a start pulse and a clock pulse to the shift register and simultaneously outputting video signals input to the image signal input line to all of the plurality of source signal lines.

A method for driving a display device including a plurality of pixels arranged in a matrix form, a plurality of source signal lines inputting a video signal to the plurality of pixels, and a source driver outputting a signal to each of the plurality of source signal lines, wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first latch circuits, a plurality of second latch circuits to which a signal output from each of the plurality of first latch circuits is input, and a plurality of D/A converter circuits to which a signal output from each of the plurality of the second latch circuits is input, the method comprising:

• determining whether or not digital video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another;
• in a case where digital video signals corresponding to at least two pixels of the digital video signals corresponding to the pixels in one row of the plurality of pixels are different from each other, sequentially outputting digital video signals input to the plurality of image signal input lines to the plurality of first latch circuits in synchronization with a sampling pulse output from the shift register;
• and
• in a case where the digital video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, stopping input of a start pulse to the shift register and simultaneously outputting digital video signals input to the plurality of image signal input lines to all of the plurality of first latch circuits.

A method for driving a display device including a plurality of pixels arranged in a matrix form, a plurality of source signal lines inputting a video signal to the plurality of pixels, and a source driver outputting a signal to each of the plurality of source signal lines, wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first latch circuits, a plurality of second latch circuits to which a signal output from each of the plurality of first latch circuits is input, and a plurality of D/A converter circuits to which a signal output from each of the plurality of the second latch circuits is input, the method comprising:

• determining whether or not digital video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another;
• in a case where digital video signals corresponding to at least two pixels of the digital video signals corresponding to the pixels in one row of the plurality of pixels are different from each other, sequentially outputting digital video signals input to the plurality of image signal input lines to the plurality of first latch circuits in synchronization with a sampling pulse output from the shift register;
• and
• in a case where the digital video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, stopping input of a start pulse and a clock pulse to the shift register and simultaneously outputting digital video signals input to the plurality of image signal input lines to all of the plurality of first latch circuits.

A method for driving a display device including a plurality of pixels arranged in a matrix form, a plurality of source signal lines inputting a video signal to the plurality of pixels, and a source driver outputting signals to each of the plurality of source signal lines, wherein the source driver includes a shift register and an image signal input line to which a video signal is input, the method comprising:

• determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another;
• in a case where video signals corresponding to at least two pixels of the video signals corresponding to the pixels in one row of the plurality of pixels are different from each other, outputting a video signal input to the image signal input line to the plurality of source signal lines in synchronization with a sampling pulse output from the shift register;
• and
• in a case where the signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, stopping input of a start pulse to the shift register and simultaneously outputting a predetermined signal input to an output signal line to all of the plurality of source signal lines.

A method for driving a display device including a plurality of pixels arranged in a matrix form, a plurality of source signal lines inputting a video signal to the plurality of pixels, and a source driver outputting a signal to each of the plurality of source signal lines, wherein the source driver includes a shift register and an image signal input line to which a video signal is input, the method comprising:

• determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another;
• in a case where video signals corresponding to at least two pixels of the video signals corresponding to the pixels in one row of the plurality of pixels are different from each other, outputting a video signal input to the image signal input line to the plurality of source signal lines in synchronization with a sampling pulse output from the shift register;
• and
• in a case where the signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, stopping input of a start pulse and a clock pulse to the shift register and simultaneously outputting a predetermined signal input to an output signal line to all of the plurality of source signal lines.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a means for controlling whether or not a start pulse is input to the source driver,
• wherein the source driver includes a shift register, an image signal input line to which a video signal is input, a plurality of first switches, a second switch, a plurality of third switches, and a power source terminal kept at predetermined potential,
• wherein each of the plurality of third switches includes a control terminal and is turned on or off in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of third switches is connected to an output terminal of the shift register through a single first switch of the plurality of first switches and is also connected to the power source terminal through the second switch,
• wherein the image signal input line is connected to a single source signal line of the plurality of source signal lines through a single third switch of the plurality of third switches, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting video signals to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a means for controlling whether or not a start pulse and a clock pulse are input to the source driver,
• wherein the source driver includes a shift register, an image signal input line to which a video signal is input, a plurality of first switches, a second switch, a plurality of third switches, and a power source terminal kept at predetermined potential,
• wherein each of the plurality of third switches includes a control terminal and is turned on or off in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of third switches is connected to an output terminal of the shift register through a single first switch of the plurality of first switches and is also connected to the power source terminal through the second switch,
• wherein the image signal input line is connected to a single source signal line of the plurality of source signal lines through a single third switch of the plurality of third switches, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a control circuit outputting a control signal and determining whether or not a start pulse is input to the source driver,
• wherein the source driver includes a shift register, an image signal input line to which a video signal is input, a plurality of first switches, a second switch, a plurality of third switches, and a power source terminal kept at predetermined potential,
• wherein each of the plurality of third switches includes a control terminal and is turned on or off in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of third switches is connected to an output terminal of the shift register through a single first switch of the plurality of first switches and is also connected to the power source terminal through the second switch,
• wherein the image signal input line is connected to a single source signal line of the plurality of source signal lines through a single third switch of the plurality of third switches,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, and in a case where all of signals corresponding to the all of the pixels in one row of the plurality of pixels are equal to one another, input of a start pulse to the shift register is stopped and the control signal is output to turn on the second switch.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a control circuit outputting a control signal and determining whether or not a start pulse and a clock pulse are input to the source driver,
• wherein the source driver includes a shift register, an image signal input line to which a video signal is input, a plurality of first switches, a second switch, a plurality of third switches, and a power source terminal kept at predetermined potential,
• wherein each of the plurality of third switches includes a control terminal and is turned on or off in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of third switches is connected to an output terminal of the shift register through a single first switch of the plurality of first switches and is also connected to the power source terminal through the second switch,
• wherein the image signal input line is connected to a single source signal line of the plurality of source signal lines through a single third switch of the plurality of third switches,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, and in a case where the video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, input of a start pulse and a clock pulse to the shift register is stopped and the control signal is output to turn on the second switch.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a means for controlling whether or not a start pulse is input to the source driver,
• wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first switches, a second switch, a power source terminal kept at predetermined potential, a plurality of first latch circuits, a plurality of second latch circuits, and a plurality of D/A converter circuits,
• wherein each of the plurality of first latch circuits includes a control terminal and an output terminal of each of the plurality of first latch circuits is selectively connected to the plurality of image signal input lines in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of first latch circuits is connected to an output terminal of the shift register through a single first switch of the plurality of first switches, and is also connected to the power source terminal through the second switch,
• wherein when a latch pulse is input to an output terminal of a single first latch circuit of the plurality of first latch circuits, the output terminal of the single first latch circuit of the plurality of first latch circuits is connected to an input terminal of a single second latch circuit of the plurality of second latch circuits,
• wherein an output terminal of a single second latch circuit of the plurality of second latch circuits is connected to an input terminal of a single D/A converter circuit of the plurality of D/A converter circuits,
• wherein an output terminal of a single D/A converter circuit of the plurality of D/A converter circuits is connected to a single source signal line of the plurality of source signal lines, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a means for controlling whether or not a start pulse and a clock pulse are input to the source driver,
• wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first switches, a second switch, a power source terminal kept at predetermined potential, a plurality of first latch circuits, a plurality of second latch circuit, and a plurality of D/A converter circuits,
• wherein each of the plurality of first latch circuits includes a control terminal and an input terminal of each of the plurality of first latch circuits is selectively connected to the plurality of image signal input lines in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of first latch circuits is connected to an output terminal of the shift register through a single first switch of the plurality of different first switches, and is also connected to the power source terminal through the second switch,
• wherein when a latch pulse is input to an output terminal of a single first latch circuit of the plurality of first latch circuits, the output terminal of the single first latch circuit of the plurality of first latch circuits is connected to an input terminal of a single second latch circuit of the plurality of second latch circuits,
• wherein an output terminal of a single second latch circuit of the plurality of second latch circuits is connected to an input terminal of a single D/A converter circuit of the plurality of D/A converter circuits,
• wherein an output terminal of a single D/A converter circuit of the plurality of D/A converter circuits is connected to a single source signal line of the plurality of source signal lines, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a control circuit determining whether or not a start pulse is input to the source driver,
• wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first switches, a second switch, a power source terminal kept at predetermined potential, a plurality of first latch circuits, a plurality of second latch circuits, and a plurality of D/A converter circuits,
• wherein each of the plurality of first latch circuits includes a control terminal and an input terminal of each of the plurality of first latch circuits is selectively connected to the plurality of image signal input lines in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of first latch circuits is connected to an output terminal of the shift register through a single first switch of the plurality of first switches, and is also connected to the power source terminal through the second switch,
• wherein when a latch pulse is input to an output terminal of a single first latch circuit of the plurality of first latch circuits, the output terminal of the single first latch circuit of the plurality of first latch circuits is connected to an input terminal of a single second latch circuit of the plurality of second latch circuits,
• wherein an output terminal of a single second latch circuit of the plurality of second latch circuits is connected to an input terminal of a single D/A converter circuit of the plurality of D/A converter circuits,
• wherein an output terminal of a single D/A converter circuit of the plurality of D/A converter circuits is connected to a single source signal line of the plurality of source signal lines,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not digital video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, and in a case where the digital video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, input of a start pulse to the shift register is stopped and the control signal is output to turn on the second switch.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a signal to each of the plurality of source signal lines;
• and
• a control circuit determining whether or not a start pulse and a clock pulse are input to the source driver,
• wherein the source driver includes a shift register, a plurality of image signal input lines to which a digital video signal is input, a plurality of first switches, a second switch, a power source terminal kept at predetermined potential, a plurality of first latch circuits, a plurality of second latch circuits, and a plurality of D/A converter circuits,
• wherein each of the plurality of first latch circuits includes a control terminal and an input terminal of each of the plurality of first latch circuits is selectively connected to the plurality of image signal input lines in accordance with a signal input to the control terminal,
• wherein the control terminal of each of the plurality of first latch circuits is connected to an output terminal of the shift register through a single first switch of the plurality of different first switches, and is also connected to the power source terminal through the second switch,
• wherein when a latch pulse is input to an output terminal of a single first latch circuit of the plurality of first latch circuits, the output terminal of the single first latch circuit of the plurality of first latch circuits is connected to an input terminal of a single second latch circuit of the plurality of second latch circuits,
• wherein an output terminal of a single second latch circuit of the plurality of second latch circuits is connected to an input terminal of a single D/A converter circuit of the plurality of D/A converter circuits,
• wherein an output terminal of a single D/A converter circuit of the plurality of D/A converter circuits is connected to a single source signal line of the plurality of source signal lines,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal input to the source driver, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not digital video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, and in a case where the digital video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, input of a start pulse and a clock pulse to the shift register is stopped and the control signal is output to turn on the second switch.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a video signal to each of the plurality of source signal lines;
• a means for controlling whether or not a start pulse is input to the source driver;
• a plurality of first switches;
• a second switch;
• and
• an output signal line kept at predetermined potential,
• wherein each of the plurality of source signal lines is connected to an output terminal of the source driver through a first switch of the plurality of first switches and is also connected to the output signal line through the second switch, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels;
• a plurality of source signal lines inputting video signals to the plurality of pixels;
• a source driver outputting a video signal to each of the plurality of source signal lines;
• a means for controlling whether or not a start pulse and a clock pulse are input to the source driver;
• a plurality of first switches;
• a second switch;
• and
• an output signal line kept at predetermined potential,
• wherein each of the plurality of source signal lines is connected to an output terminal of the source driver through a single first switch of the plurality of first switches and is also connected to the output signal line through the second switch, and
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a video signal to each of the plurality of source signal lines;
• a control circuit determining whether or not a start pulse is input to the source driver;
• a plurality of first switches;
• a second switch;
• and
• an output signal line kept at predetermined potential,
• wherein each of the plurality of source signal lines is connected to an output terminal of the source driver through a single first switch of the plurality of first switches and is also connected to the output signal line through the second switch,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of the first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not video signals corresponding to all of pixels in one row of the plurality of pixels are equal to one another, and in a case where the video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, input of a start pulse to the shift register is stopped and the control signal is output to turn on the second switch.

A display device comprising:

• a plurality of pixels arranged in a matrix form;
• a plurality of source signal lines inputting a video signal to the plurality of pixels;
• a source driver outputting a video signal to each of the plurality of source signal lines;
• a control circuit determining whether or not a start pulse and a clock pulse are input to the source driver;
• a plurality of first switches;
• a second switch;
• and
• an output signal line kept at predetermined potential,
• wherein each of the plurality of source signal lines is connected to an output terminal of the source driver through a single first switch of the plurality of first switches and is also connected to the output signal line through the second switch,
• wherein the plurality of first switches and the second switch are selectively turned on or off in accordance with a control signal, when the plurality of first switches is turned on, the second switch is turned off, and when the plurality of first switches is turned off, the second switch is turned on, and
• wherein the control circuit includes a determination circuit for determining whether or not video signals corresponding all of pixels in one row of the plurality of pixels are equal to one another, and in a case where the video signals corresponding to all of the pixels in one row of the plurality of pixels are equal to one another, input of a start pulse and a clock pulse to the shift register is stopped and the control signal is output to turn on the second switch.