Input device, method of controlling the same, and program

Patent metadata

Field	Value
Publication number	US-2017010716-A1
Application number	US-201615200482-A
Country	US
Kind code	A1
Filing date	Jul 1, 2016
Priority date	Jul 9, 2015
Publication date	Jan 12, 2017
Grant date	—

Abstract

A series of degree-of-approach data of the same object generated over a plurality of cycles of a detection operation is averaged in filter processing of the filter processing unit, and accordingly, the degree-of-approach data after averaging is acquired. Therefore, even in a case in which the degree-of-approach data is temporarily greatly changed due to an influence of noise, such a temporary change in the degree-of-approach data after averaging is suppressed. Further, response characteristics of a filter in the filter processing of the filter unit are changed according to a noise level which is detected by a noise detection unit. Accordingly, since appropriate filter processing according to the noise level is performed on the degree-of-approach data, the degree-of-approach data in which the influence of noise is effectively reduced is obtained.

First claim

1 . An input device for inputting information according to a state of approach of an object approaching thereto, the input device comprising:
a detection surface to which the object approaches; a sensor unit configured to detect a degree of proximity of the object approaching the detection surface at a plurality of positions of the detection surface; a sensor control unit configured to control the sensor unit such that the sensor unit performs a periodic detection operation, the degree of proximity of the object being detected at the plurality of positions in each cycle of the periodic detection operation; a coordinate/proximity data generation unit configured to generate coordinate data and degree-of-proximity data for each cycle of the periodic detection operation based on a result of the detection in the sensor unit, the coordinate data indicating coordinates of a position of the object approaching the detection surface over a plurality of cycles including a current cycle, and degree-of-proximity data indicating the degree of proximity of the object at the position in the current cycle; a noise detection unit configured to detect noise included in the result of the detection in the sensor unit; and a filter processing unit configured to perform a predetermined filter processing for each cycle of the periodic detection operation by averaging a series of the degree-of-proximity of proximity data of the object obtained over a plurality of cycles so as to generate averaged degree-of-proximity data, or by averaging a series of the coordinate data of the object obtained over a plurality of cycles so as to generate averaged coordinate data, wherein the filter processing unit changes response characteristics of the filter processing according to a level of the noise detected in the noise detection unit.

2 . The input device according to claim 1 ,
wherein the filter processing unit slows a temporal response of the filter processing when the level of the noise detected in the noise detection unit increases.

3 . The input device according to claim 2 , further comprising:
a proximity determination unit configured to compare the averaged degree-of-proximity data or the degree-of-proximity data of a plurality of objects with a threshold value in each cycle of the periodic detection operation, and to determine, for each object, whether the object is in proximity of the detection surface based on a result of the comparison, wherein the filter processing unit changes the response characteristics of the filter operation according to a number of the objects which are determined to be in the proximity of the detection surface.

4 . The input device according to claim 3 ,
wherein the filter processing unit slows the temporal response of the filter processing when the number of the objects determined to be in the proximity of the detection surface is greater than 1 compared with the temporal response when the number of the objects determined to be in the proximity of the detection surface is equal to or smaller than 1.

5 . The input device according to claim 1 ,
wherein the filter processing unit generates the averaged degree-of-proximity data in the current cycle by weighted-averaging the averaged degree-of-proximity data in a previous cycle and the degree-of-proximity data generated by the coordinate/proximity data generation unit in the current cycle with respective weights.

6 . The input device according to claim 1 ,
wherein the filter processing unit generates the averaged coordinate data in the current cycle by weighted-averaging the averaged coordinate data in a previous cycle and the coordinate data generated by the coordinate/proximity data generation unit in the current cycle with by respective weights.

7 . An input device for inputting information according to a state of approach of an object approaching thereto, the input device comprising:
a detection surface to which the object approaches; a sensor unit configured to detect a degree of proximity of the object approaching the detection surface at a plurality of positions of the detection surface; a sensor control unit configured to control the sensor unit such that the sensor unit performs a periodic detection operation, the degree of proximity of the object being detected at the plurality of positions in each cycle of the periodic detection operation; a coordinate/proximity data generation unit configured to generate coordinate data and degree-of-proximity data for each cycle of the periodic detection operation based on a result of the detection in the sensor unit, the coordinate data indicating coordinates of a position of the object approaching the detection surface over a plurality of cycles including a current cycle, and the degree-of-proximity data indicating the degree of proximity of the object at the position in the current cycle; a noise detection unit configured to detect noise included in the result of the detection in the sensor unit; a proximity determination unit configured to compare the degree-of-proximity data of a plurality of objects with a threshold value in each cycle of the periodic detection operation, and to determine, for each object, whether the object is in proximity of the detection surface based on a result of the comparison; and a threshold value adjustment unit configured to adjust the threshold value according to a level of the noise detected in the noise detection unit.

8 . The input device according to claim 7 ,
wherein the threshold value adjustment unit adjusts the threshold value such that the proximity determination unit tends not to determine the object to be in the proximity of the detection surface as the level of the noise detected in the noise detection unit increases.

9 . The input device according to claim 8 ,
wherein the threshold value adjustment unit adjusts the threshold value according to a number of objects which are determined to be in the proximity of the detection surface.

10 . The input device according to claim 7 ,
wherein the threshold value adjustment unit adjusts the threshold value such that the proximity determination unit tends not to determine the object to be in the proximity of the detection surface when a number of objects determined to be in the proximity of the detection surface is greater than 1, compared with the threshold value when the number of the objects is equal to or smaller than 1.

11 . A method of controlling an input device for inputting information according to a state of approach of an object, the input device including a detection surface to which the object approaches and a sensor unit for detecting a degree of proximity of the object at a plurality of positions of the detection surface, the method comprising the steps of:
controlling the sensor unit such that the sensor unit performs a periodic detection operation, the degree of proximity of the object being detected at the plurality of positions in each cycle of the periodic detection operation; generating coordinate data and degree-of-proximity data for each cycle of the periodic detection operation based on a result of the detection of the sensor unit, the coordinate data indicating coordinates of a position of the object approaching the detection surface over a plurality of cycles including a current cycle, and the degree-of-proximity data indicating the degree of proximity of the object at the position in the current cycle; detecting noise included in the result of the detection in the sensor unit; and performing a predetermined filter processing for each cycle of the periodic detection operation by averaging a series of degree-of-proximity data of the object obtained over a plura

Assignees

• Alps Electric Co Ltd

Inventors

• Nakajima Satoshi
• Hayasaka Satoshi
• Miyagawa hayato
• Kitagawa Kohei

Classifications

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F2203/04101

  2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/04182

  Filtering of noise external to the device and not generated by digitiser components · CPC title

• G06F3/0446 Primary

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title