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US 9,311,850 B2Granted
Pixel for minimizing power consumption and organic light emitting display using the same
AssigneeSamsung Display Co., Ltd.
InventorsWook Lee, Jeong-Hwan Shin, Se-Byung Chae
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Abstract
A pixel capable of minimizing power consumption is disclosed. In one embodiment, the pixel includes an organic light emitting diode (OLED), a first transistor for controlling an amount of current supplied from a first power supply to the OLED to correspond to a voltage applied to a first node, and a second transistor and a third transistor coupled between a second node electrically coupled to a data line and the first node in parallel in a period where a scan signal is supplied.
Claims20
A pixel, comprising:
- an organic light emitting diode (OLED);
- a first transistor configured to control an amount of current supplied from a first power supply to the OLED to correspond to a voltage applied to a first node;
- a second transistor and a third transistor coupled between the first node and a second node in parallel in a period where a scan signal is supplied, wherein the second node is electrically coupled to a data line;
- a fourth transistor coupled between the second node and the data line;
- and
- a fifth transistor coupled between the first transistor and the OLED, wherein the fifth transistor comprises a gate electrode, a first electrode and a second electrode, wherein the first and second electrodes of the fifth transistor are coupled only to the first transistor and the OLED, and wherein the first transistor is directly coupled to the first power supply and the fifth transistor,
- wherein the fourth transistor is configured to be turned on during a scan signal applying period when the scan signal is supplied, wherein a turn-on period of the fourth transistor does not overlap with a turn-on period of the fifth transistor, wherein the fifth transistor is configured to be turned off during an emission control signal applying period when an emission control signal is applied to the fifth transistor, wherein the scan signal applying period comprises a first period during which an initialization voltage is applied to the second transistor and a second period during which a single data signal is applied to the fourth transistor, and wherein the initialization voltage is lower than the single data signal.
4 more elements
An organic light emitting display, comprising:
- a pixel unit including pixels positioned at intersections of scan lines, emission control lines, and data lines;
- a scan driver configured to supply scan signals to the scan lines and supply emission control signals to the emission control lines;
- and
- a data driver configured to supply an initializing voltage and data signals to the data lines,
- wherein each of the pixels comprises:
- an organic light emitting diode (OLED);
- a first transistor configured to control an amount of current supplied from a first power supply to the OLED to correspond to a voltage applied to a first node;
- a second transistor and a third transistor coupled between the first node and a second node in parallel in a period where a scan signal is supplied, wherein the second node is electrically coupled to one of the data lines;
- a fourth transistor coupled between the second node and the one of the data lines;
- and
- a fifth transistor coupled between the first transistor and the OLED, wherein the fifth transistor comprises a gate electrode, a first electrode and a second electrode, wherein the first and second electrodes of the fifth transistor are coupled only to the first transistor and the OLED, and wherein the first transistor is directly coupled to the first power supply and the fifth transistor,
- wherein the fourth transistor is configured to be turned on during a scan signal applying period when the scan signal is supplied, wherein the fifth transistor is configured to be turned on when an emission control signal is not supplied to an emission control line, wherein the fifth transistor is configured to be turned off during an emission control signal applying period when an emission control signal is applied to the fifth transistor, wherein the scan signal applying period comprises a first period during which an initialization voltage is applied to the second transistor and a second period during which a single data signal is applied to the fourth transistor, and wherein the initialization voltage is lower than the single data signal.
9 more elements
An organic light emitting display, comprising:
- a first plurality of pixels formed in an auxiliary region and configured to display a previously set image;
- a second plurality of pixels formed in a main region and configured to display an image corresponding to an external input;
- a data driver configured to drive data lines coupled to the first plurality of pixels and the second plurality of pixels;
- and
- a scan driver configured to sequentially supply scan signals to scan lines coupled to the first pixels and the second pixels and sequentially supply emission control signals to emission control lines,
- wherein the first plurality of pixels and the second plurality of pixels have different circuit structures,
- wherein each of the first plurality of pixels comprises:
- an organic light emitting diode (OLED);
- a first transistor configured to control an amount of current supplied from a first power supply to the OLED to correspond to a voltage applied to a first node;
- a second transistor and a third transistor coupled between the first node and a second node in parallel in a period where a scan signal is supplied, wherein the second node is electrically coupled to a data line;
- a fourth transistor coupled between the second node and the data line;
- and
- a fifth transistor coupled between the first transistor and the OLED, wherein the fifth transistor comprises a gate electrode, a first electrode and a second electrode, wherein the first and second electrodes of the fifth transistor are coupled only to the first transistor and the OLED, and wherein the first transistor is directly coupled to the first power supply and the fifth transistor,
- wherein the data driver is configured to supply a data signal corresponding to a specific gray scale in a period where the scan signal is not supplied, and wherein the specific gray scale is an average gray scale of data items supplied to the auxiliary region.
11 more elements
Dependencies are inferred from the claim text.