Light emitting display, display panel, and driving method thereof
A light emitting display for compensating for the threshold voltage of transistor or mobility and fully charging a data line. A transistor and first through third switches are formed on a pixel circuit of an organic EL display. The transistor supplies a driving current for emitting an organic EL element (OLED). The first switch diode-connects the transistor. A first storage unit stores a first voltage corresponding to a threshold voltage of the transistor. A second switch transmits a data current in response to a select signal. A second storage unit stores a second voltage corresponding to the data current. A third switch transmits the driving current to the OLED. A third voltage determined by coupling of the first and second storage units is applied to a transistor to supply the driving current to the OLED.
1. A display comprising:
a data line for transmitting a data current;
a scan line for applying a select signal;
a switch coupled to the data line and turned on in response to the select signal from the scan line in a first period such that the data current flows through the switch;
a transistor having a first electrode, a second electrode and a control electrode, and for providing a current corresponding to a voltage between the first electrode and the control electrode through the second electrode;
a first capacitor coupled between the first electrode and the control electrode of the transistor, for storing a voltage corresponding to a threshold voltage of the transistor in a second period before the first period, and for storing a voltage corresponding to the data current flowing through the switch in the first period;
a second capacitor electrically coupled to the first capacitor in parallel in the second period and a third period after the first period, and having one end electrically blocked from the first capacitor in the first period; and
an emitting element for emitting light in response to the current provided through the second electrode of the transistor in the third period.
2. The display of claim 1 , wherein the second electrode of the transistor is electrically coupled to the control electrode of the transistor in the first and second periods.
3. The display of claim 2 , wherein in the third period, the first electrode of the transistor is electrically coupled to a first voltage source, the second electrode of the transistor is electrically coupled to a first electrode of the emitting element, and a second electrode of the emitting element is electrically coupled to a second voltage source.
4. The display of claim 3 , wherein the second electrode of the transistor is electrically blocked from the second voltage source in the first and second periods.
5. The display of claim 3 , wherein the transistor is a PMOS transistor, a voltage of the first voltage source is higher than a voltage of the second voltage source, the first electrode of the emitting element is an anode electrode, and the second electrode of the emitting element is a cathode electrode.
6. The display of claim 1 , wherein the emitting element emits light by an emission of an organic material.
7. The display of claim 2 , wherein the second electrode and the control electrode of the transistor are electrically coupled to the data line in the first period.
8. The display of claim 3 , wherein the transistor is an NMOS transistor, a voltage of the first voltage source is lower than a voltage of the second voltage source, the first electrode of the emitting element is a cathode electrode, and the second electrode of the emitting element is an anode electrode.