Organic light emitting diode display device

An organic light emitting diode display device, comprising:

• a display panel;
• a plurality of light emitting diodes arranged on the display panel and emitting light, an amount of the light varying according to an amount of a first current supplied to the light emitting diodes;
• a sample/hold unit for supplying the current to the light emitting diodes;
• a D/A converter for controlling the amount of the current supplied to the light emitting diodes from the sample/hold unit according to image data;
• and
• a voltage controller for controlling a second current flowing between the D/A converter and the sample/hold unit by outputting a second bias voltage of which loss voltage has been compensated according to a characteristic of a transistor provided at the D/A converter to the D/A converter by receiving a first bias voltage.

An organic light emitting diode (OLED) display device comprising:

• a pixel array unit having a plurality of pixels arranged in matrix configuration;
• a sample and hold unit including a current mirror circuit and connected to at least one of the pixels for providing a current to said pixel using the current mirror circuit;
• a digital/analogue (D/A) converter including a plurality of switching devices connected to the sample and hold unit and a plurality of sink transistors for controlling an amount of the current provided to said pixel in accordance with digital image data received from a video source;
• and
• a voltage controller connected to gate electrodes of the sink transistors of the D/A converter and outputting a voltage level modulated based on a threshold voltage characteristic of the sink transistors of the D/A converter.