Display device and detecting method thereof, pixel driving circuit
A display device includes multiple pixel driving circuits coupled in series. A first pixel driving circuit of the multiple pixel driving circuits includes a first switch, a capacitor and an accommodation space. A first terminal of the first switch is configured to output the detecting signal. A second terminal of the first switch and a first terminal of the capacitor are coupled to a first node. A second terminal of the capacitor and a first terminal of the accommodation space are coupled to a second node. A second terminal of the accommodation space is configured to receive a reference signal. The accommodating space is configured to accommodate a light-emitting element after a detecting operation. During the detecting operation, an electrical relation between the first terminal of the accommodation space and the second terminal of the accommodation space is determined based on the detecting signal.
1 . A display device, comprising:
a plurality of pixel driving circuits coupled in series, wherein a first pixel driving circuit of the plurality of pixel driving circuits comprises:
a first switch, wherein a first terminal of the first switch is configured to output a detecting signal, and a second terminal of the first switch is coupled with a first node;
a capacitor, wherein a first terminal of the capacitor is coupled with the first node, and a second terminal of the capacitor is coupled with a second node; and
an accommodation space, wherein a first terminal of the accommodation space is coupled with the second node, a second terminal of the accommodation space is configured to receive a reference voltage signal, and the accommodation space is configured to accommodate a light-emitting element after a detecting operation is executed,
wherein the reference voltage signal is adjusted and an electrical relation between the first terminal of the accommodation space and the second terminal of the accommodation space is determined according to the detecting signal, when the detecting operation is executed.
2 . The display device of claim 1 , wherein:
a control terminal of the first switch is configured to receive a first scan signal;
during a first period in the detecting operation,
the reference voltage signal has a first voltage level,
the first scan signal has a second voltage level, and
the detecting signal has a first detecting voltage level;
during a second period in the detecting operation,
the reference voltage signal has the second voltage level,
the detecting signal has a second detecting voltage level, and
the first scan signal has the second voltage level;
the first period is different from the second period; and
the first voltage level is different from the second voltage level.
3 . The display device of claim 2 , wherein:
the first detecting voltage level is roughly the same as the second detecting voltage level, when it is open between the first terminal of the accommodation space and the second terminal of the accommodation space; and
the first detecting voltage level is different from the second detecting voltage level, when it is short between the first terminal of the accommodation space and the second terminal of the accommodation space.
4 . The display device of claim 2 , wherein:
a second pixel driving circuit of the plurality of pixel driving circuits is configured to output the detecting signal, receive the reference voltage signal, and receive a second scan signal;
during a third period in the detecting operation,
each of the reference voltage signal and the first scan signal has the first voltage level, and
the second scan signal has the second voltage level;
during a fourth period in the detecting operation,
each of the reference voltage signal and the second scan signal has the second voltage level, and
the first scan signal has the first voltage level;
the first period and the third period are arranged in order; and
the second period and the fourth period are arranged in order.
5 . The display device of claim 4 , wherein:
the first detecting voltage level is roughly the same as the second detecting voltage level, when it is open between the first terminal of the accommodation space and the second terminal of the accommodation space; and
the first detecting voltage level is different from the second detecting voltage level, when it is short between the first terminal of the accommodation space and the second terminal of the accommodation space.
6 . A detecting method of a display device, comprising:
during a first period,
providing a reference voltage signal having a first voltage level to a first node;
generating a detecting signal from a third node, according to a voltage level of a second node;
during a second period,
adjusting the reference voltage signal to a second voltage level different from the first voltage level;
comparing a first detecting voltage level of the detecting signal during the first period with a second detecting voltage level of the detecting signal during the second period;
determining an electrical relation between the first node and the second node, according to a difference between the first detecting voltage level and the second detecting voltage level; and
coupling a light-emitting element between the first node and the second node, when the electrical relation meets a default electrical relation, wherein a capacitor is coupled between the second node and the third node.
7 . The detecting method of claim 6 , wherein:
the first detecting voltage level is roughly the same as the second detecting voltage level and the electrical relation meets the default electrical relation, when it is open between the first node and the second node; and
the first detecting voltage level is different from the second detecting voltage level, when it is short between the first node and the second node.
8 . The detecting method of claim 6 , further comprising:
outputting the detecting signal through a first switch coupled with the third node.
9 . The detecting method of claim 8 , further comprising:
providing a scan signal having the second voltage level to a control terminal of the first switch, during each of the first period and the second period.
10 . The detecting method of claim 9 , wherein:
the first detecting voltage level is roughly the same as the second detecting voltage level and the electrical relation meets the default electrical relation, when it is open between the first node and the second node; and
the first detecting voltage level is different from the second detecting voltage level, when it is short between the first node and the second node.
11 . A detecting method of a display device, comprising:
during a first period,
turning on a first switch coupled between a: first terminal of an accommodation space and a node outputting a detecting signal;
turning on a second switch coupled between the node and an electrical testing device;
inputting a reference voltage signal maintaining at a first voltage level into a second terminal of an accommodation space; and
detecting the detecting signal and generating a first detecting result, by the electrical testing device; and
during a second period,
adjusting the reference voltage signal from the first voltage level to a second voltage level that is different from the first voltage level;
detecting the detecting signal and generating a second detecting result, by the electrical testing device; and
determining an electrical relation between the first terminal and the second terminal, according to a difference between the first detecting result and the second detecting result.
12 . The detecting method of claim 11 , further comprising:
turning off a third switch coupled with the node during the first period.
13 . The detecting method of claim 11 , further comprising:
determining the electrical relation between the first terminal and the second terminal is a short circuit, when the first detecting result is different from the second detecting result.