Electrostatic sensing device
First Claim
1. An electrostatic sensing device configured to measure electrostatic charge of a measurement target placed in front of the electrostatic sensing device, the electrostatic sensing device comprising:
- a sensor oxide semiconductor TFT; and
a controller configured to control the sensor oxide semiconductor TFT,wherein the sensor oxide semiconductor TFT includes;
an oxide semiconductor active layer;
a source electrode connected with the oxide semiconductor active layer;
a drain electrode connected with the oxide semiconductor active layer;
a gate electrode behind the oxide semiconductor active layer; and
a gate insulating layer between the gate electrode and the oxide semiconductor active layer, andwherein the controller is configured to;
measure a difference from a reference current of a current flowing between the source electrode and the drain electrode, while applying a driving voltage to the gate electrode; and
determine polarity of electrostatic charge of the measurement target based on direction of the difference from the reference current.
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Accused Products
Abstract
An electrostatic sensing device includes a sensor oxide semiconductor TFT, and a controller configured to control the sensor oxide semiconductor TFT. The sensor oxide semiconductor TFT includes an oxide semiconductor active layer, a source electrode connected with the oxide semiconductor active layer, a drain electrode connected with the oxide semiconductor active layer, a gate electrode behind the oxide semiconductor active layer, and a gate insulating layer between the gate electrode and the oxide semiconductor active layer The controller is configured to measure a difference from a reference current of a current flowing between the source electrode and the drain electrode, while applying a driving voltage to the gate electrode, and determine polarity of electrostatic charge of the measurement target based on direction of the difference from the reference current.
6 Citations
11 Claims
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1. An electrostatic sensing device configured to measure electrostatic charge of a measurement target placed in front of the electrostatic sensing device, the electrostatic sensing device comprising:
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a sensor oxide semiconductor TFT; and a controller configured to control the sensor oxide semiconductor TFT, wherein the sensor oxide semiconductor TFT includes; an oxide semiconductor active layer; a source electrode connected with the oxide semiconductor active layer; a drain electrode connected with the oxide semiconductor active layer; a gate electrode behind the oxide semiconductor active layer; and a gate insulating layer between the gate electrode and the oxide semiconductor active layer, and wherein the controller is configured to; measure a difference from a reference current of a current flowing between the source electrode and the drain electrode, while applying a driving voltage to the gate electrode; and determine polarity of electrostatic charge of the measurement target based on direction of the difference from the reference current. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrostatic sensing device configured to measure electrostatic charge of a measurement target placed in front of the electrostatic sensing device, the electrostatic sensing device comprising:
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a plurality of sensor oxide semiconductor TFTs arrayed on a substrate; a plurality of switch oxide semiconductor TFTs on the substrate, the plurality of switch oxide semiconductor TFT each configured to select one of the plurality of sensor oxide semiconductor TFTs; and a controller configured to control the plurality of sensor oxide semiconductor TFTs and the plurality of switch oxide semiconductor TFTs, wherein each of the plurality of sensor oxide semiconductor TFTs includes; a first oxide semiconductor active layer; a first source electrode connected with the first oxide semiconductor active layer; a first drain electrode connected with the first oxide semiconductor active layer; a first gate electrode behind the first oxide semiconductor active layer; and a first gate insulating layer between the first gate electrode and the first oxide semiconductor active layer, wherein each of the plurality of switch oxide semiconductor TFTs includes; a second oxide semiconductor active layer; a second source electrode connected with the second oxide semiconductor active layer; a second drain electrode connected with the second oxide semiconductor active layer; a third electrode in front of the second oxide semiconductor active layer; and a second insulating layer between the third electrode and the second oxide semiconductor active layer, and wherein the controller is configured to; apply a predetermined voltage to the third electrodes in measuring the electrostatic charge of the measurement target; control the plurality of switch oxide semiconductor TFTs to select the plurality of sensor oxide semiconductor TFTs one by one; measure a difference from a reference current of a current flowing between the first source electrode and the first drain electrode, while applying a driving voltage to the first gate electrode of a sensor oxide semiconductor TFT selected from the plurality of sensor oxide semiconductor TFT; and determine intensity of an electrostatic field generated by electrostatic charge of the measurement target based on direction and amount of the difference. - View Dependent Claims (9, 10, 11)
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Specification