Display panel, display device and detection method
A display panel, a display device and a detection method are provided. The display panel includes a display area and a peripheral area surrounding the display area. Pixel units arranged in an array are disposed in the display area. The pixel unit includes a pixel driving circuit. A crack detecting line is disposed in the peripheral area, and the crack detecting line is connected to a reset signal terminal of the pixel driving circuit of at least one pixel unit. The display panel can reduce the influence of the voltage drop over the crack detection line on the brightness during the electrical detection stage, and can also improve the crack detection rate of the peripheral area.
1. A display panel, comprising
a display area and a peripheral area surrounding the display area, wherein
pixel units arranged in an array are disposed in the display area,
each of the pixel units comprises a pixel driving circuit,
a crack detection line is disposed in the peripheral area, and the crack detection line is connected to a reset signal terminal of the pixel driving circuit of at least one pixel unit.
2. The display panel of claim 1 , wherein
the pixel driving circuit comprises a reset circuit having the reset signal terminal and comprises a light-emitting circuit connected to the reset circuit, and
the reset circuit is configured to receive from the crack detection line a crack detection signal to cause the light-emitting circuit to emit light.
3. The display panel of claim 2 , wherein
the pixel driving circuit further comprises a driving circuit, and the driving circuit is configured to control a driving current for driving the light-emitting circuit to emit light.
4. The display panel of claim 1 , wherein the crack detection line is disposed around the display area.
5. The display panel of claim 4 , wherein the crack detection line comprises a snake-shaped line, portion.
6. The display panel of claim 4 , wherein a plurality of the crack detection lines are disposed in different regions of the peripheral area, and the plurality of the crack detection lines are respectively connected to the reset signal terminals of the pixel driving circuits of different pixel units.
7. The display panel of claim 1 , wherein reset signal terminals of pixel driving circuits of at least one row of the pixel units are all connected to a first reset signal line, and the first reset signal line is connected to the crack detection line.
8. The display panel of claim 7 , wherein the crack detection line comprises a first portion away from the display area and a second portion close to the display area, and
the first portion and the second portion are parallel with each other, and the first reset signal line is connected to the second portion of the crack detection line.
9. The display panel of claim 7 , wherein in the display area, except the at least one row of the pixel units electrically connected to the crack detection line, each row of pixel units is correspondingly provided with a second reset signal line, and the second reset signal line is connected to reset signal terminals of pixel driving circuits of the each row of pixel units.
10. The display panel of claim 9 , wherein the crack detection line comprises a crack detection terminal disposed on one side of a bonding area in the peripheral area, and the crack detection terminal is configured to receive a crack detecting signal, and
the first reset signal line is closer to the crack detection terminal than the second reset signal line.
11. The display panel of claim 10 , further comprising a reset common line, wherein the reset common line is connected to the second reset signal line.
12. The display panel of claim 11 , wherein the reset common line is connected to the crack detection terminal.
13. The display panel of claim 7 , wherein the crack detection line is disposed around the display area.
14. The display panel of claim 13 , wherein the crack detection line comprises a snake-shaped line portion.
15. The display panel of claim 13 , wherein a plurality of the crack detection lines are disposed in different regions of the peripheral area, and the plurality of the crack detection lines are respectively connected to the reset signal terminals of the pixel driving circuits of different pixel units.
16. The display panel of claim 1 , wherein the crack detection line is provided in a gate metal layer, a source-drain metal layer of a driving transistor of the pixel driving circuit.
17. A display device, comprising the display panel of claim 1 .
18. A method of detecting the display panel of claim 1 , comprising:
providing the crack detection signal to the reset signal terminal of the pixel driving circuit in the at least one pixel unit through the crack detection line; and
observing whether the display panel presents a dark line during display.
19. The method of claim 18 , further comprising:
in a case where the display panel comprises the first reset signal line, the crack detection signal is supplied to the reset signal terminal of the pixel unit not connected to the first reset signal line.
20. The method of claim 18 , further comprising:
in a case where the pixel driving circuit comprises a reset circuit having the reset signal terminal and comprises a light-emitting circuit connected to the reset circuit, a reset control signal is provided to turn on the reset circuit, and the crack detection signal is provided to the light-emitting circuit by the reset circuit.