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US 12,592,198 B2Granted
Pixel circuit and display device including the same
AssigneeLG Display Co., Ltd.
InventorsJu Han Kim, Jin Seong Kim
Life of this patent
Estimating the term…
Abstract
A pixel circuit and a display device including the same are disclosed. More particularly, a pixel circuit and a display device including the same that are capable of sensing for external compensation when driving a display using a first driving element that drives a light emitting element and a second driving element that is connected to the first driving element and includes a same material and structure as the first driving element.
Claims20
A pixel circuit comprising:
- a first driving element including a first-first electrode that is configured to be selectively connected to a driving power line that supplies a pixel driving voltage, a first gate electrode connected to a first node, and a second-first electrode connected to a second node to which a data voltage is applied;
- a light-emitting element including an anode electrode that is configured to be selectively connected to the second node and a cathode electrode connected to a cathode power line, the light-emitting element emitting light responsive to a driving current from the first driving element and not from a second driving element;
- the second driving element including a first-second electrode connected to the driving power line, a second gate electrode connected to the first gate electrode of the first driving element at the first node, and a second-second electrode connected to a third node;
- and
- a switch element connected to a sensing line of an external compensation circuit and the second-second electrode at the third node, the switch element configured to electrically connect the third node and the sensing line such that a sensing voltage at the third node is applied to the external compensation circuit via the sensing line responsive to a gate-on voltage of a gate signal for sensing that is applied to the switch element, the sensing voltage indicative of at least a threshold voltage of the second driving element during a pixel sensing period.
2 more elements
A pixel circuit comprising:
- a first driving element including a first-first electrode that is connected to a driving power line that applies a pixel driving voltage to the first-first electrode, a first gate electrode connected to a first node to which a reference voltage or a data voltage is selectively applied to the first gate electrode, and a second-first electrode connected to a second node;
- a light-emitting element including an anode electrode connected to the second node and a cathode electrode connected to a cathode power line, the light-emitting element configured to emit light responsive to a driving current from the first driving element and not from a second driving element;
- the second driving element including a first-second electrode connected to the driving power line that applies the pixel driving voltage to the first-second electrode, a second gate electrode connected to the first gate electrode of the first driving element at the first node, and a second-second electrode connected to a third node;
- and
- a switch element connected to a sensing line of an external compensation circuit and the second-second electrode at the third node, the switch element configured to electrically connect the third node and the sensing line such that a sensing voltage at the third node is applied to the external compensation circuit via the sensing line in response to a gate-on voltage of a gate signal for sensing that is applied to the switch element, the sensing voltage indicative of at least a threshold voltage of the second driving element during a pixel sensing period.
2 more elements
A pixel circuit comprising:
- a first driving element including a first electrode that is electrically connected to a driving power line that applies a pixel driving voltage to the first electrode, a first gate electrode connected to a first node, and a second electrode connected to a second node;
- a light-emitting element including an anode electrode that is electrically connected to the second node and a cathode electrode connected to a cathode power line, the light-emitting element configured to emit light responsive to a driving current from the first driving element and not from a second driving element;
- the second driving element including a first electrode that is electrically connected to the driving power line, a second gate electrode that is connected to the first gate electrode of the first driving element at the first node, and a second electrode that is connected to a third node;
- and
- a switch element connected to the second electrode of the second driving element at the third node and a sensing line of an external compensation circuit, the switch element configured to electrically connect the third node and the sensing line such that a sensing voltage at the third node that includes at least a threshold voltage of the second driving element is applied to the external compensation circuit via the sensing line while the switch element is turned on during a pixel sensing period,
- wherein a data voltage that is applied to the first gate electrode of the first driving element and the second gate electrode of the second driving element is compensated based on the sensing voltage that includes at least the threshold voltage of the second driving element.
3 more elements
Dependencies are inferred from the claim text.