PIXEL CIRCUIT, ORGANIC ELECTRO-LUMINESCENT DISPLAY APPARATUS, AND METHOD OF DRIVING THE SAME
First Claim
Patent Images
1. A pixel circuit comprising:
- a light emitting device comprising a first electrode and a second electrode;
a driving transistor comprising;
a first electrode;
a second electrode; and
a gate electrode, the driving transistor for outputting a driving current according to a voltage applied to the gate electrode of the driving transistor;
a first capacitor comprising a first terminal and a second terminal, the second terminal of the first capacitor being coupled to the gate electrode of the driving transistor;
a second capacitor comprising a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device;
a second transistor comprising;
a first electrode coupled to the gate electrode of the driving transistor;
a second electrode coupled to the first electrode of the driving transistor; and
a gate electrode;
a third transistor for applying a first power supply voltage to the first electrode of the driving transistor in response to an emission control signal;
a fourth transistor comprising a first electrode for receiving to a data signal and a second electrode coupled to the first terminal of the first capacitor;
a fifth transistor comprising;
a first electrode for receiving a reference voltage;
a second electrode coupled to the first terminal of the first capacitor; and
a gate electrode; and
a sixth transistor comprising;
a first electrode for receiving a first voltage;
a second electrode coupled to the gate electrode of the driving transistor; and
a gate electrode,wherein the driving transistor and the second to sixth transistors are N-type transistors.
2 Assignments
0 Petitions
Accused Products
Abstract
A pixel circuit includes a light emitting device, an N-type driving transistor for outputting a driving current according to a voltage applied to the gate electrode, a first capacitor coupled to a gate electrode of the driving transistor, a second capacitor including a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device, and second through sixth N-type transistors. An initialization period is reduced for a driving operation and the threshold voltage compensation time of a driving transistor is controlled.
-
Citations
23 Claims
-
1. A pixel circuit comprising:
-
a light emitting device comprising a first electrode and a second electrode; a driving transistor comprising;
a first electrode;
a second electrode; and
a gate electrode, the driving transistor for outputting a driving current according to a voltage applied to the gate electrode of the driving transistor;a first capacitor comprising a first terminal and a second terminal, the second terminal of the first capacitor being coupled to the gate electrode of the driving transistor; a second capacitor comprising a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the light emitting device; a second transistor comprising;
a first electrode coupled to the gate electrode of the driving transistor;
a second electrode coupled to the first electrode of the driving transistor; and
a gate electrode;a third transistor for applying a first power supply voltage to the first electrode of the driving transistor in response to an emission control signal; a fourth transistor comprising a first electrode for receiving to a data signal and a second electrode coupled to the first terminal of the first capacitor; a fifth transistor comprising;
a first electrode for receiving a reference voltage;
a second electrode coupled to the first terminal of the first capacitor; and
a gate electrode; anda sixth transistor comprising;
a first electrode for receiving a first voltage;
a second electrode coupled to the gate electrode of the driving transistor; and
a gate electrode,wherein the driving transistor and the second to sixth transistors are N-type transistors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of driving a pixel circuit comprising an organic light emitting diode (OLED), a driving transistor, a plurality of switching transistors configured to turned on in response to first to third scan signals and an emission control signal, a plurality of storage capacitors, and a boosting capacitor coupled between first electrodes of boosting transistors, wherein the driving transistor, the switching transistors, and the boosting transistors are NMOS transistors, the method comprising:
-
initializing the pixel circuit when the first scan signal has a high signal level; diode-connecting the driving transistor to compensate for a threshold voltage of the driving transistor when the second scan signal has the high signal level; writing a data signal in the pixel circuit when the third scan signal has the high signal level; and flowing a current through the OLED to emit light in response to the written data signal when the emission control signal has the high signal level. - View Dependent Claims (17, 18)
-
-
19. An organic electro-luminescent display apparatus comprising:
-
a scan driver for supplying a scan signal to a plurality of scan lines; an emission control driver for supplying an emission control signal to a plurality of emission control lines; a data driver for supplying a data signal to a plurality of data lines; and a plurality of pixel circuits located at crossing regions of the scan lines, the emission control lines and the data lines, wherein each pixel circuit of the plurality of pixel circuits comprises; an organic light emitting diode (OLED) comprising a first electrode and a second electrode; a driving transistor comprising;
a first electrode;
a second electrode; and
a gate electrode, the driving transistor for outputting a driving current according to a voltage applied to the gate electrode of the driving transistor;a first capacitor comprising a first terminal and a second terminal coupled to the gate electrode of the driving transistor; a second capacitor comprising a first terminal coupled to the gate electrode of the driving transistor and a second terminal coupled to the first electrode of the OLED; a second transistor comprising;
a first electrode coupled to the gate electrode of the driving transistor;
a second electrode coupled to the first electrode of the driving transistor; and
a gate electrode;a third transistor for applying a first power supply voltage to the first electrode of the driving transistor in response to the emission control signal; a fourth transistor comprising;
a first electrode coupled to the data signal, a second electrode coupled to the first terminal of the first capacitor; and
a gate electrode;a fifth transistor comprising;
a first electrode coupled to a reference voltage;
a second electrode coupled to the first terminal of the first capacitor; and
a gate electrode; anda sixth transistor comprising;
a first electrode coupled to the first power supply voltage;
a second electrode coupled to the gate electrode of the driving transistor; and
a gate electrode,wherein the driving transistor and the second to sixth transistors are N-type transistors. - View Dependent Claims (20, 21, 22, 23)
-
Specification