| CPC G09G 3/3233 (2013.01) [G09G 3/2096 (2013.01); G09G 2300/0819 (2013.01); G09G 2300/0828 (2013.01); G09G 2300/0852 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/0289 (2013.01); G09G 2310/0294 (2013.01); G09G 2330/021 (2013.01)] | 7 Claims |
|
1. An electroluminescent display apparatus comprising:
a plurality of pixels, each of the plurality of pixels comprising:
a driving element including a first gate electrode connected to a first gate node, a second gate electrode that faces the first gate electrode and connected to a second gate node, a source electrode connected to a source node, and a drain electrode supplied with a high level driving voltage;
a light emitting device connected between the source node and an input terminal for a low level driving voltage, the light emitting device configured to emit light responsive to a driving current applied from the driving element during an emission period; and
an internal compensation circuit including a first capacitor connected to the first gate node and the source node, the internal compensation circuit configured to sample a threshold voltage of the driving element to reflect the sampled threshold voltage in a gate-source voltage of the driving element during a sampling period that precedes the emission period,
wherein a sampling reinforcement voltage that increases a sampling current flowing in the driving element is applied to the second gate electrode of the driving element during the sampling period that precedes the emission period, and
wherein an image quality compensation voltage which is less than the sampling reinforcement voltage is applied to the second gate electrode of the driving element during a programming period that is between the sampling period and the emission period,
wherein during the programming period, the image quality compensation voltage is supplied from an external power source to the second gate node through a fourth switching element and stored in a second capacitor connected between the second gate node and the source node.
|