Organic electro-luminescent display device and method for driving the same

An organic electro-luminescent display device comprising:

• a plurality of pixels, the pixels having an electro-luminescent element that emits light according to a current supplied thereto;
• a first switching element that switches a data voltage from a data line in response to a scan signal from a gate line;
• a second switching element that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage switched by the first switching element;
• and
• a polarity controller that applies a pulse voltage to a source terminal of the second switching element to vary a polarity of a gate-source voltage of the second switching element, the pulse voltage periodically having a first voltage with a value between a minimum value and a maximum value of the data voltage and a second voltage that is higher than the maximum value of the data voltage.

An organic electro-luminescent display device comprising:

• a plurality of pixels, the pixels having an electro-luminescent element that emits light according to an amount of a current supplied thereto;
• a first switching element that switches a data voltage from a data line in response to a scan signal from a gate line;
• a second switching element that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage switched by the first switching element;
• and
• a polarity controller that selectively applies a voltage to a source terminal of the second switching element according to the data voltage applied to a gate terminal of the second switching element that varies a polarity of a gate-source voltage of the second switching element.

An organic electro-luminescent display device comprising:

• a plurality of pixels, the pixels having an electro-luminescent element that emits light according to an amount of a current supplied thereto;
• a data modulator that receives image data from a timing controller, inserts dummy data between the received image data and outputs the resulting image data;
• a data driver that generates a data voltage based on the image data and a dummy data voltage based on the dummy data and outputs the generated data voltage and dummy data voltage to a plurality of data lines, the dummy data voltage having an opposite polarity to that of the data voltage;
• a gate driver that sequentially outputs a first scan pulse synchronized with the data voltage and a second scan pulse synchronized with the dummy data voltage to each gate line on a frame-by-frame basis;
• a first switching element that switches the data voltage and the dummy data voltage in response to the first scan pulse and the second scan pulse, respectively;
• and
• a second switching element formed in each pixel that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage and dummy data voltage that is switched by the first switching element.

An organic electro-luminescent display device comprising:

• a plurality of pixels, the pixels having an electro-luminescent element that emits light according to an amount of a current supplied thereto;
• a data modulator that receives image data from a timing controller, inserts dummy data between the received image data and outputs the resulting image data;
• a data driver that generates a data voltage based on the image data and a dummy data voltage based on the dummy data and supplies the generated data voltage and dummy data voltage to a plurality of data lines, the dummy data voltage having a value lower than a minimum value of the data voltage;
• a gate driver that sequentially outputs a first scan pulse synchronized with the data voltage and a second scan pulse synchronized with the dummy data voltage to each gate line on a frame-by-frame basis;
• a first switching element that switches the data voltage and the dummy data voltage in response to the first scan pulse and the second scan pulse, respectively;
• a second switching element formed in each pixel that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage and dummy data voltage switched by the first switching element;
• and
• a polarity controller that applies a voltage having a value between the minimum value and a maximum value of the data voltage to a source terminal of the second switching element to vary a polarity of a gate-source voltage of the second switching element according to the data voltage.

A method for driving an organic electro-luminescent display device, the display device including a plurality of pixels, the pixels having an electro-luminescent element formed in each pixel that emits light according to current supplied thereto, a first switching element that switches a data voltage from a data line in response to a scan signal from a gate line, and a second switching element that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage switched by the first switching element, the method comprising:

• applying a pulse voltage to a source terminal of the second switching element;
• varying a polarity of a gate-source voltage of the second switching element according to the data voltage applied to a gate terminal of the second switching element;
• and
• changing the pulse voltage periodically to have a first voltage with a value between a minimum value and maximum value of the data voltage and a second voltage higher than the maximum value of the data voltage.

A method for driving an organic electro-luminescent display device, the display device including a plurality of pixels, the pixels having an electro-luminescent element that emits light according to an amount of a current supplied thereto, a first switching element that switches a data voltage from a data line in response to a scan signal from a gate line, and a second switching element that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage switched by the first switching element, the method comprising:

• receiving image data from a timing controller;
• inserting dummy data between the received image data, the dummy data having a voltage with an opposite polarity to that of the data voltage;
• outputting a data voltage based on the image data and the dummy data voltage;
• applying a first scan pulse synchronized with the data voltage to a gate terminal of the first switching element to turn on the first switching element so as to apply the data voltage to a gate terminal of the second switching element;
• and
• applying a second scan pulse synchronized with the dummy data voltage to the gate terminal of the first switching element to turn on the first switching element so as to apply the dummy data voltage to the gate terminal of the second switching element.

A method for driving an organic electro-luminescent display device, the display device including a plurality of pixels, the pixels having an electro-luminescent element that emits light according to an amount of a current supplied thereto, a first switching element that switches a data voltage from a data line in response to a scan signal from a gate line, and a second switching element that adjusts the amount of the current supplied to the electro-luminescent element according to the data voltage switched by the first switching element, the method comprising:

• receiving image data from a timing controller;
• inserting dummy data between the received image data, the dummy data having a value lower than a minimum value of the data voltage;
• outputting a data voltage based on the image data and the dummy data voltage;
• applying a first scan pulse synchronized with the data voltage to a gate terminal of the first switching element to turn on the first switching element so as to apply the data voltage to a gate terminal of the second switching element;
• applying a second scan pulse synchronized with the dummy data voltage to the gate terminal of the first switching element to turn on the first switching element so as to apply the dummy data voltage to the gate terminal of the second switching element;
• and
• applying a voltage having a value between the minimum value and a maximum value of the data voltage to a source terminal of the second switching element to vary a polarity of a gate-source voltage of the second switching element.