Light emission driver for display device, display device and driving method thereof
AssigneeSamsung Display Co., Ltd.
InventorsTae-Hoon Kwon, Ji-Hyun Ka
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Abstract
A light emission driver for a display device is disclosed. In one aspect, the driver includes a first node to which first and second light emitting power source voltages are applied according to respective clock signals. The driver also includes a second node to which the first and third light emitting power source voltages are applied according to the respective clock signals. The driver further includes first and second transistors respectively turned on by the first and second nodes and respectively transmitting the second and first light emitting power source voltages to a light emitting signal output terminal, respectively.
Claims27
A light emission driver for a display device comprising:
- a plurality of light emitting driving blocks,
- wherein each of the light emitting driving blocks is configured to receive first and second light emitting power source voltages and comprises:
- a first node to which the second light emitting power source voltage is applied according to a first clock signal input to a first clock signal input terminal and the first light emitting power source voltage is applied according to a second clock signal input to a second clock signal input terminal;
- a second node to which the first light emitting power source voltage is applied according to the first clock signal and a third light emitting power source voltage is applied according to the second clock signal, wherein the second node is electrically connected to a reverse light emitting signal output terminal;
- and
- a first transistor configured to be turned on by the first node and configured to transmit the second light emitting power source voltage to a light emitting signal output terminal, and
- a second transistor configured to be turned on by the second node and configured to transmit the first light emitting power source voltage to the light emitting signal output terminal.
A display device comprising:
- a plurality of pixels, each including a driving transistor configured to control a driving current flowing to an organic light emitting diode (OLED) and a storage capacitor including a first electrode electrically connected to a gate electrode of the driving transistor;
- and
- a light emission driver configured to 1) apply a reference voltage to a second electrode of the storage capacitor by outputting a reverse light emitting signal of a gate-on voltage for a period during which a data voltage is applied to each of the pixels, and 2) apply a first power source voltage to the second electrode of the storage capacitor by outputting a light emitting signal of the gate-on voltage for a voltage during which the OLED emits light by the driving current.
A method for driving a display device including a plurality of pixels, each including a driving transistor controlling a driving current flowing to an organic light emitting diode (OLED), a storage capacitor including a first electrode electrically connected to a gate electrode of the driving transistor, a first reference voltage transistor configured to apply a reference voltage to a second electrode of the storage capacitor according to a reverse light emitting signal, and a second reference voltage transistor configured to transmit a first power source voltage to a second electrode of the storage capacitor according to a light emitting signal, comprising initializing during which a first scan signal is applied to an initialization transistor electrically connected to the driving transistor and thus an initialization voltage is transmitted to the gate electrode of the driving transistor;
- compensating a threshold voltage and writing data during which a second scan signal is applied to a compensation transistor that is electrically connected to a switching transistor electrically connected to the first electrode of the driving transistor and the second electrode of the driving transistor to diode-connect the driving transistor and thus a data voltage to which a threshold voltage of the driving transistor is reflected is transmitted to the gate electrode of the driving transistor;
- and
- emitting light during which the light emitting signal is applied to 1) a first light emitting transistor electrically connected between the first power source voltage and the first electrode of the driving transistor and 2) a second light emitting transistor electrically connected between the second electrode of the driving transistor and the OLED to flow a driving current to the OLED.
Dependencies are inferred from the claim text.