Display device
A display device includes a display panel having a plurality of pixels connected to gate lines and data lines, and a plurality of fingerprint sensors connected to sensing lines and read-out lines. A gate driver provides gate signals to the gate lines and provides sensing signals to the sensing lines. The gate driver includes a first gate signal supply module providing a first gate signal to a first gate line among the gate lines. A first switching element is turned on by a reset enable signal to connect the first gate line and a first sensing line among the sensing lines.
1. A display device comprising:
a display panel comprising a plurality of pixels connected to gate lines and data lines, and a plurality of fingerprint sensors connected to sensing lines and read-out lines; and
a gate driver providing gate signals to the gate lines and providing sensing signals to the sensing lines, the sensing lines providing the sensing signals to the plurality of fingerprint sensors,
wherein the gate driver comprises:
a first gate signal supply module providing a first gate signal to a first gate line among the gate lines; and
a first switching element turned on by a reset enable signal, wherein the first switching element connects the first gate line and a first sensing line among the sensing lines to each other, and
wherein in response to the reset enable signal being received when the first gate signal has a gate-on level, the first switching element provides a reset signal to the first sensing line.
2. The display device of claim 1 , wherein:
the first gate signal has the gate-on level during a plurality of horizontal scanning periods of a single frame; and
the reset enable signal is provided to the first switching element during a final horizontal scanning period of the plurality of horizontal scanning periods.
3. The display device of claim 1 , wherein:
the first gate signal has the gate-on level over a plurality of frames, and
the reset enable signal is provided to the first switching element over at least one frame of the plurality of frames.
4. The display device of claim 1 , wherein the gate driver further comprises:
a second gate signal supply module providing a second gate signal to a second gate line among the gate lines; and
a second switching element turned on by a scan enable signal to connect the second gate line to a second sensing line among the sensing lines.
5. The display device of claim 1 , wherein each of the plurality of pixels comprises:
a light-emitting element;
a first pixel transistor controlling a driving current that is provided to the light-emitting element;
a second pixel transistor selectively providing a data voltage to a first node, the first node is a first electrode of the first pixel transistor;
a third pixel transistor selectively connecting a second node and a third node, the second node is a second electrode of the first pixel transistor, and the third node is a gate electrode of the first pixel transistor; and
a fourth pixel transistor selectively providing an initialization voltage to the third node.
6. The display device of claim 1 , wherein
the plurality of pixels comprise first, second, and third pixels emitting light of different colors,
the display panel comprises a plurality of unit pixel areas, and
each of the plurality of unit pixel areas comprises at least one of each of the first, second, and third pixels and at least one fingerprint sensor.
7. The display device of claim 1 , wherein the display panel comprises:
a substrate;
a thin-film transistor (TFT) layer disposed on the substrate; and
a light-emitting element layer disposed on the thin-film transistor layer, the thin film transistor layer comprises:
a gate insulating film disposed on the substrate; and
an interlayer insulating film disposed on the gate insulating film, and
each of the plurality of pixels include a light-emitting element and each of the plurality of fingerprint sensors includes a light-receiving element, the light-emitting elements and the light-receiving elements are disposed in the light-emitting element layer.
8. The display device of claim 1 , wherein the display panel further comprises a display driver providing data voltages to the data lines and receiving sensing signals from the read-out lines.
9. The display device of claim 1 , wherein:
the gate lines and the sensing lines extend in a first direction and are spaced apart from one another in a second direction intersecting the first direction; and
the data lines and the read-out lines extend in the second direction and are spaced apart from one another in the first direction.
10. The display device of claim 4 , wherein in response to the scan enable signal being received when the second gate signal has a gate-on level, the second switching element provides a scan signal to the second sensing line.
11. The display device of claim 5 , wherein:
the second and third pixel transistors are turned on by the first gate signal; and
the fourth pixel transistor is turned on by a second gate signal.
12. The display device of claim 5 , wherein each of the plurality of pixels further comprises:
a fifth pixel transistor selectively providing a driving voltage to the first node;
a sixth pixel transistor selectively connecting the second node and a fourth node, the fourth node is a first electrode of the light-emitting element; and
a seventh pixel transistor selectively providing the initialization voltage to the fourth node.
13. The display device of claim 7 , wherein each of the plurality of pixels comprises:
a pixel transistor including an active area, a source electrode, and a drain electrode that are disposed on the substrate;
the pixel transistor further includes a gate electrode disposed on the gate insulating film; and
a first connecting electrode is disposed on the interlayer insulating film and is connected to the drain electrode of the pixel transistor.
14. The display device of claim 7 , wherein each of the plurality of fingerprint sensors comprises:
a sensor transistor including an active area, a source electrode, and a drain electrode that are disposed on the substrate;
the sensor transistor further includes a gate electrode disposed on the gate insulating film; and
a second connecting electrode is disposed on the interlayer insulating film and is connected to the drain electrode of the sensor transistor.
15. The display device of claim 10 , wherein:
the second gate signal has the gate-on level during a plurality of horizontal scanning periods of a single frame; and
the scan enable signal is provided to the second switching element during a final horizontal scanning period of the plurality of horizontal scanning periods.
16. The display device of claim 10 , wherein each of the plurality of fingerprint sensors comprises:
a light-receiving element;
a first node that is a first electrode of the light-receiving element;
a first sensor transistor providing a common voltage to a second node based on a voltage of the first node;
a second sensor transistor selectively connecting the second node and one of the read-out lines; and
a third sensor transistor selectively providing a reset voltage to the first node.
17. The display device of claim 13 , wherein each of the light-emitting elements comprises:
a pixel electrode disposed on the thin-film transistor layer and connected to the first connecting electrode;
a light-emitting layer disposed on the pixel electrode; and
a common electrode disposed on the light-emitting layer.
18. The display device of claim 14 , wherein each of the light-receiving elements comprises:
a sensor electrode disposed on the thin-film transistor layer and connected to the second connecting electrode;
a light-receiving layer disposed on the sensor electrode; and
a common electrode disposed on the light-receiving layer.
19. The display device of claim 16 , wherein:
the second sensor transistor is turned on by the scan signal; and
the third sensor transistor is turned on by the reset signal.