Sensor device and method for controlling sensor nodes
A sensor device including: a sensor array including sensor nodes; signal lines connected to the sensor nodes; and a sensor driver configured to: select each of the sensor nodes through the signal lines to sense a touch of a user that is adjacent to the sensor array; apply, through a first signal line, a first pulse signal to at least one first sensor node adjacent to the selected sensor node among the sensor nodes; and apply, through a second signal line, a second pulse signal having a polarity reverse to a polarity of the first pulse signal to at least one second sensor node among the sensor nodes, wherein the sensor driver electrically connects the first signal line to the second signal line to adjust voltage levels of the first and the second pulse signals.
1 . An electronic device comprising:
a display panel including pixels;
a sensor array overlapping the display panel and including sensor nodes; and
a panel driver to select one of the sensor nodes to sense a touch of a user, apply a first pulse signal to at least one first sensor node of the sensor nodes adjacent to the selected sensor node, and apply a second pulse signal having a polarity reverse to a polarity of the first pulse signal to at least one second sensor node of the sensor nodes,
wherein the panel driver is configured to control the first sensor node and the second sensor node to share charges with each other during a portion of a period of time for which the first and second pulse signals are applied.
2 . The electronic device of claim 1 , wherein the second sensor node is adjacent to the first sensor node.
3 . The electronic device of claim 1 , wherein the first sensor node is adjacent to the selected sensor node without another sensor node interposed between the selected sensor node and the first sensor node.
4 . The electronic device of claim 1 , wherein a number of the at least one second sensor node to which the second pulse signal is applied is identical to a number of the at least one first sensor node to which the first pulse signal is applied.
5 . The electronic device of claim 1 , further comprising signal lines to connect the sensor nodes to the panel driver,
wherein the panel driver is configured to control the sensor nodes through the signal lines.
6 . The electronic device of claim 5 , wherein the signal lines comprise a first signal line connected to the first sensor node and a second signal line connected to the second sensor node, and
wherein the panel driver includes a switch connected between the first signal line and the second signal line, and is configured to turn on the switch such that the first sensor node and the second sensor node share charges with each other during the portion of the period of time.
7 . The electronic device of claim 1 , wherein each of the first and second pulse signals toggles between a first voltage level and a second voltage level,
wherein during a first partial time period of the period of time for which the first and second pulse signals are applied, the first pulse signal transitions from the first voltage level to the second voltage level, and the second pulse signal transitions from the second voltage level to the first voltage level, and
wherein the panel driver is configured to control the first sensor node and the second sensor node to share charges with each other during a first portion of the first partial time period.
8 . The electronic device of claim 7 , wherein the panel driver is configured to bias the first sensor node to the second voltage level and bias the second sensor node to the first voltage level during a second portion of the first partial time period following the first portion of the first partial time period.
9 . The electronic device of claim 7 , wherein during a second partial time period of the period of time for which the first and second pulse signals are applied, the first pulse signal transitions from the second voltage level to the first voltage level, and the second pulse signal transitions from the first voltage level to the second voltage level, and
wherein the panel driver is configured to control the first sensor node and the second sensor node to share charges with each other during a first portion of the second partial time period.
10 . The electronic device of claim 9 , wherein the panel driver is configured to bias the first sensor node to the first voltage level and bias the second sensor node to the second voltage level during a second portion of the second partial time period following the first portion of the second partial time period.
11 . The electronic device of claim 1 , wherein the panel driver is configured to control the first sensor node and the second sensor node to share charges with each other during the portion of the period of time by electrically connecting the first sensor node and the second sensor node to each other.
12 . The electronic device of claim 1 , wherein the panel driver is configured to select the one of the sensor nodes by applying a third pulse signal to the one of the sensor nodes.
13 . The electronic device of claim 12 , wherein the panel driver is configured to apply a fourth pulse signal to a third sensor node of the sensor nodes,
wherein each of the third and the fourth pulse signals toggles between a first voltage level and a second voltage level,
wherein, during the period of time for which the first and second pulse signals are applied, the third pulse signal transitions from the first voltage level to the second voltage level, and the fourth pulse signal transitions from the second voltage level to the first voltage level.
14 . The electronic device of claim 13 , wherein the first and the second sensor nodes are between the selected sensor node and the third sensor node.
15 . The electronic device of claim 13 , wherein the panel driver is configured to control the selected sensor node and the third sensor node to share charges with each other during a portion of the period of time for which the third pulse signal transitions from the first voltage level to the second voltage level.
16 . The electronic device of claim 13 , wherein the panel driver is configured to bias, during a period of time for which a voltage level of the third pulse signal gradually decreases from the second voltage level, the third sensor node to the second voltage level without controlling the selected sensor node and the third sensor node to share charges with each other.
17 . The electronic device of claim 1 , wherein the panel driver comprises:
a display driver to control the display panel; and
a sensor driver to control the sensor array.
18 . An electronic device comprising:
a panel comprising sensor array having sensor nodes; and
a panel driver to, when one of the sensor nodes is selected to sense a touch of a user, apply a first pulse signal to at least one first sensor node of the sensor nodes adjacent to the selected sensor node, and apply a second pulse signal having a polarity reverse to a polarity of the first pulse signal to at least one second sensor node of the sensor nodes,
the panel driver is configured to control the first sensor node and the second sensor node to share charges with each other during a portion of a period of time for which the first and second pulse signals are applied.
19 . The electronic device of claim 18 , wherein the panel further comprises a display panel overlapping the sensor array and including pixels.