Display device
Disclosed is a display device comprising a driving transistor provided on a substrate and including a gate electrode, a source electrode, and a drain electrode, a light emitting element provided on the driving transistor and including an anode electrode having a first anode electrode and a second anode electrode spaced apart from each other, an emission layer, and a cathode electrode, a first anode connection portion configured to electrically connect the first anode electrode and the driving transistor to each other, and a second anode connection portion configured to electrically connect the second anode electrode and the driving transistor to each other, wherein the first anode connection portion includes a control transistor having an active layer, a gate electrode, a source electrode, and a drain electrode.
1 . A display device comprising:
a driving transistor on a substrate, the driving transistor including an active layer, a gate electrode, a source electrode, and a drain electrode;
a light emitting element on the driving transistor, the light emitting element including an anode electrode having a first anode electrode and a second anode electrode that is spaced apart from the first anode electrode, an emission layer, and a cathode electrode;
a first anode connection portion configured to electrically connect the first anode electrode and the driving transistor to each other;
a second anode connection portion configured to electrically connect the second anode electrode and the driving transistor to each other; and
a third anode connection portion having one end that is electrically connected to one of the source electrode and the drain electrode of the driving transistor and extends in an outer direction,
wherein the first anode connection portion includes a control transistor having an active layer, a gate electrode, a source electrode, and a drain electrode, and
wherein one of the source electrode and the drain electrode of the control transistor is connected to the third anode connection portion through a contact hole.
2 . The display device according to claim 1 , wherein one of the source electrode and the drain electrode of the control transistor is connected to the driving transistor, and the other thereof is connected to the first anode electrode.
3 . The display device according to claim 1 , further comprising:
a control line applied with a control signal for the control transistor,
wherein the gate electrode of the control transistor is connected to the control line.
4 . The display device according to claim 3 , wherein the control line extends in a first direction between the driving transistor and the first anode connection portion.
5 . The display device according to claim 1 , wherein the second anode connection portion includes a first anode connection line that is on the driving transistor.
6 . The display device according to claim 1 , wherein the third anode connection portion includes a second anode connection line that is on the driving transistor.
7 . The display device according to claim 1 , wherein one end of the second anode connection portion is electrically connected to the third anode connection portion and another end of the second anode connection portion is electrically connected to the second anode electrode.
8 . The display device according to claim 1 , wherein the second anode connection portion extends from the third anode connection portion.
9 . The display device according to claim 1 , wherein the first anode connection portion includes a first cutting area that is configured to be cut when a defect occurs in the first anode electrode, and the second anode connection portion includes a second cutting area that is configured to be cut when a defect occurs in the second anode electrode.
10 . The display device according to claim 9 , wherein the first cutting area is at a portion that is non-overlapping with the gate electrode, the source electrode, and the drain electrode of the control transistor in an area that includes the active layer of the control transistor.
11 . The display device according to claim 1 , wherein the first anode connection portion includes a first cutting area through which the first anode electrode and the driving transistor are disconnected, or
the second anode connection portion includes a second cutting area through which the second anode electrode and the driving transistor are disconnected.
12 . The display device according to claim 1 , wherein the light emitting element includes a first light emitting element including the first anode electrode, the emission layer, and the cathode electrode, and a second light emitting element including the second anode electrode, the emission layer, and the cathode electrode, and
wherein the first light emitting element and the second light emitting element share the driving transistor.
13 . The display device according to claim 12 , further comprising:
a reference line electrically connected to the first light emitting element and the second light emitting element, the reference line applied with an initialization voltage during a first period; and
an analog-to-digital converter connected to the reference line, the analog-to-digital converter configured to sense a voltage through the reference line during a second period.
14 . The display device according to claim 13 , wherein during both the first period and the second period, a voltage corresponding to a black voltage is applied to the gate electrode of the driving transistor.
15 . The display device according to claim 13 , further comprising:
a first switch configured to connect the reference line to a reference voltage source during the first period and to separate the reference line from the reference voltage source during the second period; and
a second switch configured to connect the reference line to the analog-to-digital converter during at least a portion of the second period and to separate the reference line from the analog-to-digital converter during the first period.
16 . The display device according to claim 13 , further comprising a defect detection portion configured to determine a defective light emitting element among the first light emitting element and the second light emitting element based on the voltage sensed through the analog-to-digital converter.
17 . The display device according to claim 16 , wherein the defect detection portion determines the second light emitting element as a defective light emitting element responsive to the sensed voltage being less than a first reference value, and determines the first light emitting element as a defective light emitting element responsive to the sensed voltage being equal to or greater than the first reference value and less than a second reference value that is greater than the first reference value.
18 . The display device according to claim 13 , wherein a defective light emitting element among the first light emitting element and the second light emitting element is determined based on the voltage sensed through the AD converter.
19 . The display device according to claim 1 , wherein a resistance of the first anode connection portion is greater than a resistance of the second anode connection portion.
20 . The display device according to claim 1 ,
wherein the first anode electrode includes a first protrusion protruding outward from one side thereof,
the second anode electrode includes a second protrusion protruding outward from one side thereof, and
the first anode connection portion and the second anode connection portion are disposed between the first protrusion and the second protrusion.
21 . A display device comprising:
a driving transistor provided on a substrate and including a gate electrode, a source electrode, and a drain electrode;
a light emitting element provided on the driving transistor and including an anode electrode having a first anode electrode and a second anode electrode spaced apart from each other, an emission layer, and a cathode electrode;
a first anode connection portion configured to electrically connect the first anode electrode and the driving transistor to each other;
a second anode connection portion configured to electrically connect the second anode electrode and the driving transistor to each other;
a third anode connection portion having one end that is electrically connected to one of the source electrode and the drain electrode of the driving transistor and extends in an outer direction,
wherein the first anode connection portion includes a variable resistance portion connected between the first anode electrode and the driving transistor, and
wherein one of the source electrode and the drain electrode of the control transistor is connected to the third anode connection portion through a contact hole.
22 . The display device according to claim 21 , wherein a resistance of the variable resistance portion is controlled by a control signal supplied from a control line.