Image sensing device
An image sensing device for sensing an image sensing pixel array through a plurality of sensing lines is provided. The image sensing device includes a first switch, a second switch, a transistor, and a current source. A first terminal of the first switch is coupled to a first sensing line among the sensing lines. A first terminal of the second switch is coupled to a second sensing line among the sensing lines. A first terminal of the transistor is coupled to a second terminal of the first switch and a second terminal of the second switch. The current source is coupled to a second terminal of the transistor.
1 . An image sensing device, for sensing an image sensing pixel array through a plurality of sensing lines, the image sensing device comprising:
a first switch, having a first terminal configured to be coupled to a first sensing line among the sensing lines;
a second switch, having a first terminal configured to be coupled to a second sensing line among the sensing lines;
a transistor, having a first terminal coupled to a second terminal of the first switch and a second terminal of the second switch; and
a first current source, coupled to a second terminal of the transistor.
2 . The image sensing device according to claim 1 , wherein a control terminal of the transistor is coupled to the second terminal of the transistor.
3 . The image sensing device according to claim 1 , further comprising:
a second current source, configured to be coupled to the first sensing line; and
a third current source, configured to be coupled to the second sensing line.
4 . The image sensing device according to claim 1 , further comprising:
a third switch, having a first terminal configured to be coupled to the first sensing line;
a fourth switch, having a first terminal configured to be coupled to the second sensing line; and
a second current source, coupled to a second terminal of the third switch and a second terminal of the fourth switch.
5 . The image sensing device according to claim 4 , further comprising:
a fifth switch, having a first terminal configured to be coupled to a third sensing line among the sensing lines, wherein a second terminal of the fifth switch is coupled to the first terminal of the transistor;
a sixth switch, having a first terminal configured to be coupled to a fourth sensing line among the sensing lines, wherein a second terminal of the sixth switch is coupled to the first terminal of the transistor;
a seventh switch, having a first terminal configured to be coupled to the third sensing line and a second terminal coupled to the second current source; and
an eighth switch, having a first terminal configured to be coupled to the fourth sensing line and a second terminal coupled to the second current source.
6 . The image sensing device according to claim 1 , further comprising:
a second current source, configured to be coupled to the first sensing line and the second sensing line.
7 . The image sensing device according to claim 1 , wherein the first switch is maintained on and the second switch is maintained off during a period where the image sensing device reads out a sensing signal corresponding to the first sensing line, and the second switch is maintained on and the first switch is maintained off during a period where the image sensing device reads out a sensing signal corresponding to the second sensing line.
8 . The image sensing device according to claim 1 , wherein the first sensing line is coupled to an odd-numbered sensing pixel column of the image sensing pixel array and the second sensing line is coupled to an even-numbered sensing pixel column of the image sensing pixel array.
9 . An image sensing device comprising:
an image sensing panel, having a first sensing line, a second sensing line, an image sensing pixel array, a first switch, a second switch, and a transistor, wherein the first sensing line is coupled to a first sensing pixel column of the image sensing pixel array, the second sensing line is coupled to a second sensing pixel column of the image sensing pixel array, a first terminal of the first switch is coupled to the first sensing line, a first terminal of the second switch is coupled to the second sensing line, and a second terminal of the first switch and a second terminal of the second switch are coupled to a first terminal of the transistor; and
an image readout integrated circuit, having a third switch and an output line, wherein a first terminal of the third switch is coupled to a second terminal and a control terminal of the transistor of the image sensing panel, and a second terminal of the third switch is coupled to the output line.
10 . The image sensing device according to claim 9 , wherein the image sensing panel further comprises:
a first current source, coupled to the first sensing line; and
a second current source, coupled to the second sensing line.
11 . The image sensing device according to claim 9 , wherein the image readout integrated circuit further comprises:
a capacitor, having a first terminal and a second terminal respectively coupled to the second terminal of the third switch and a reference voltage; and
a current source, coupled to the first terminal of the third switch.
12 . The image sensing device according to claim 9 , wherein the image sensing panel further comprises:
a current source, coupled to the second terminal and the control terminal of the transistor.
13 . The image sensing device according to claim 9 , wherein the image readout integrated circuit further comprises:
a fourth switch, having a first terminal configured to be coupled to the first sensing line of the image sensing panel;
a fifth switch, having a first terminal configured to be coupled to the second sensing line of the image sensing panel; and
a current source, coupled to a second terminal of the fourth switch and a second terminal of the fifth switch.
14 . The image sensing device according to claim 13 , wherein
the image sensing panel further comprises a sixth switch and a seventh switch, a first terminal of the sixth switch is coupled to a third sensing line of the image sensing panel, a second terminal of the sixth switch is coupled to the first terminal of the transistor, a first terminal of the seventh switch is coupled to a fourth sensing line of the image sensing panel, and a second terminal of the seventh switch coupled to the first terminal of the transistor; and
the image readout integrated circuit further comprises an eighth switch and a ninth switch, a first terminal of the eighth switch is coupled to the third sensing line of the image sensing panel, a second terminal of the eighth switch is coupled to the current source, a first terminal of the ninth switch is coupled to the fourth sensing line of the image sensing panel, and a second terminal of the ninth switch is coupled to the current source.
15 . The image sensing device according to claim 9 , wherein the image readout integrated circuit further comprises:
a current source, configured to be coupled to the first sensing line and the second sensing line of the image sensing panel.
16 . The image sensing device according to claim 9 , wherein the first switch is maintained on and the second switch is maintained off during a period where the image readout integrated circuit reads out a sensing signal corresponding to the first sensing line, and the second switch is maintained on and the first switch is maintained off during a period where the image readout integrated circuit reads out a sensing signal corresponding to the second sensing line.
17 . The image sensing device according to claim 9 , wherein the first sensing line is coupled to an odd-numbered sensing pixel column of the image sensing pixel array and the second sensing line is coupled to an even-numbered sensing pixel column of the image sensing pixel array.
18 . An image sensing device comprising:
an image sensing panel, having an image sensing pixel array, a sensing line, a first switch, a transistor, and a first pad, wherein the sensing line is coupled to a sensing pixel column of the image sensing pixel array, the sensing line is adapted to be coupled to a first current source, a first terminal of the first switch is coupled to the sensing line, a second terminal of the first switch is coupled to a first terminal of the transistor, and a second terminal and a control terminal of the transistor are coupled to the first pad; and
an image readout integrated circuit, having a second pad and a second current source, wherein the second pad is configured to be coupled to the first pad, and the second current source is coupled to the second pad.
19 . The image sensing device according to claim 18 , wherein the first current source is disposed at the image sensing panel.
20 . The image sensing device according to claim 18 , wherein the image sensing panel further comprises a third pad, the third pad is coupled to the sensing line, and the image readout integrated circuit further comprises:
the first current source;
a second switch, having a first terminal coupled to the first current source; and
a fourth pad, configured to be coupled to the third pad, wherein the fourth pad is coupled to a second terminal of the second switch.
21 . The image sensing device according to claim 18 , wherein the image readout integrated circuit further comprises:
a second switch, having a first terminal coupled to the second pad;
a capacitor, having a first terminal and a second terminal respectively coupled to a second terminal of the second switch and a reference voltage; and
an output line, coupled to the second terminal of the second switch.