Data driver and light emitting diode display device including the same

A light emitting diode display device comprising:

• a display region having a scan line, a data line, a line having a feedback function, and a pixel coupled to the scan line, the data line, and the line having a feedback function;
• a scan driver for supplying scan signals to the scan line in sequence;
• and
• a data driver coupled to the data line and the line having a feedback function, and supplying a data voltage as a data signal to the data line,
• wherein the data driver includes:
• a voltage digital-analog converter for generating the data voltage corresponding to a data received by the data driver from an external source;
• a current digital-analog converter for generating a sensing current corresponding to the data;
• and
• a comparator:
• for receiving a feedback pixel current, the pixel current being generated in a pixel corresponding to the data voltage being supplied to the pixel and the pixel current being fed back from the pixel to the comparator;
• for comparing the pixel current with the sensing current;
• and
• for generating a first control signal and a second control signal having widths being varied according to a difference between the pixel current and the sensing current;
• and
• a current adjuster being turned on and off by the first control signal and the second control signal for allowing a current to flow to a first capacitor based on the first control signal and for allowing a current to flow out from the first capacitor based on the second control signal, and for controlling the data voltage to be supplied to the pixel based on an increase or decrease of the current out from the first capacitor.

A data driver comprising:

• a voltage digital-analog converter for generating a data voltage corresponding to a data received by the data driver from an external source;
• a current digital-analog converter for generating a sensing current corresponding to the data;
• and
• a voltage control block:
• for supplying the data voltage to a first capacitor,
• for receiving a pixel current, the pixel current being generated in a pixel corresponding to the data voltage being supplied to the pixel and the pixel current being fed back from the pixel to the voltage control block,
• for increasing or decreasing a current charging the first capacitor based on the pixel current, and
• for controlling the data voltage being supplied to the pixel based on a voltage being charged in the first capacitor, the voltage being charged in the first capacitor being varied corresponding to the current charging the first capacitor.

A data driver comprising:

• a voltage digital-analog converter for generating a data voltage corresponding to a data received by the data driver from an external source;
• a current digital-analog converter for generating a sensing current corresponding to the data;
• and
• a comparator:
• for receiving a feedback pixel current, the pixel current being generated in a pixel corresponding to the data voltage being supplied to the pixel and the pixel current being fed back from the pixel to the comparator,
• for comparing the pixel current with the sensing current, and
• for generating a first control signal and a second control signal having widths being varied according to a difference between the pixel current and the sensing current;
• and
• a current adjuster being turned on and off by the first control signal and the second control signal for allowing a current to flow to a first capacitor based on the first control signal and for allowing a current to flow out from the first capacitor based on the second control signal, and for controlling the data voltage to be supplied to the pixel based on an increase or decrease of the current out from the first capacitor.

A method of driving a light emitting diode display device, the method comprising:

• generating a data voltage and a sensing current corresponding to a data;
• supplying the data voltage to a pixel to generate a pixel current corresponding to the data voltage;
• increasing or decreasing the amount of current charging a capacitor;
• and
• controlling the data voltage to be supplied to the pixel based on a voltage applied to the capacitor, the voltage applied to the capacitor being varied corresponding to the current charging the capacitor.

A method of driving a light emitting diode display device, the method comprising:

• generating a data voltage and a sensing current corresponding to a data;
• supplying the data voltage to a data line during a first period of one horizontal period;
• comparing the sensing current with a pixel current, the pixel current corresponding to the data voltage during a second period of a one horizontal period, the second period being separate from the first period;
• and
• increasing or decreasing the sensing current charging a capacitor based on the comparison;
• and
• controlling the data voltage to be supplied to the pixel based on a voltage applied to the capacitor, the voltage applied to the capacitor being varied corresponding to the current charging the capacitor.

A method for controlling image brightness corresponding to data received in an organic light emitting display device having a pixel for emitting light, the method comprising:

• generating a data voltage and a sensing current corresponding to the data;
• storing the data voltage in a capacitor;
• supplying the data voltage stored in the capacitor to the pixel to generate a pixel current corresponding to the data voltage;
• comparing the pixel current with the sensing current corresponding to the data;
• and
• controlling the data voltage to provide a desired image brightness by incrementing the data voltage if the pixel current is lower than the sensing current and decrementing the data voltage if the pixel current is higher than the sensing current.