# US 8,542,213 B2 · Touched position detection method for touch panel

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- Number: US 8,542,213 B2
- Document ID: US8542213B2
- Status: Granted
- Kind: B2
- Application number: 12/496,804
- Filed: 2009-07-02
- Published: 2010-03-11
- Granted: 2013-09-24
- Earliest claimed: 2008-09-08
- Assignees: Hitachi Displays, Ltd.; Panasonic Liquid Crystal Display Co., Ltd.
- Applicants: Koji Doi; Norio Mamba; Koji Nagata; Toshiyuki Kumagai; Koji Hayakawa; Toshiaki Atsuta
- Inventors: Koji Doi; Norio Mamba; Koji Nagata; Toshiyuki Kumagai; Koji Hayakawa; Toshiaki Atsuta
- Web page: https://patentgrep.com/patent/US8542213B2

## CPC

- G06F 3/0445: {using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer}
- G06F 3/0446: {using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

In a touched position detection method for a touch panel for detecting a touched position, based on measured values by a plurality of sensors, presence of a touch is determined when a measured value by a sensor exceeds a touch threshold. As a touch threshold, a value which cannot be attained due to a mere noise but can due to presence of a touch is set. With respect to sensors located in the vicinity of a sensor showing a high measured value, a higher weighted value is applied to modify a measured value in a touched position calculation process than that to be applied to other sensors.

## Claims

### Claim 1

A touched position detection method for a touch panel for detecting a touched position, based on measured values by a plurality of sensors, comprising:
a step of selecting sensors located in a vicinity of a sensor showing a measured value higher than a predetermined level; and
a step of applying a first noise reduction parameter to measured values by the selected sensors and applying a second noise reduction parameter which is different from the first noise reduction parameter to measured values by other sensors having a measured value lower than the measured value of the selected sensors,
wherein the first and second noise reduction parameters are respectively predetermined values to be subtracted from a measured value by a sensor to be referred to in a touched position calculation process.

### Claim 2 (depends on 1)

The touched position detection method for a touch panel according to claim 1, wherein
the sensors are electrodes of which static capacitance is able to be measured, and
the measured values are values indicating static capacitance.

### Claim 3 (depends on 1)

The touched position detection method for a touch panel according to claim 1, wherein the selected sensors are a set of sensors located within a predetermined distance from the sensor showing a high measured value.

### Claim 4

A touched position detection method for a touch panel for detecting a touched position, based on current measured values by sensors and reference values which are measured values by sensors with absence of a touch, comprising:
a step of selecting sensors located in a vicinity of a sensor showing a measured value higher than a predetermined level, wherein content of an update process for updating the reference values is controlled depending on whether or not sensors of concern are included in the selected sensors and,
a step of applying a first noise reduction parameter to measured values by the selected sensors and applying a second noise reduction parameter which is different from the first noise reduction parameter to measured values by other sensors having a measured value lower than the measured value of the selected sensors,
wherein the first and second noise reduction parameters are respectively predetermined values to be subtracted from a measured value by a sensor to be referred to in a touched position calculation process.

### Claim 5 (depends on 4)

The touched position detection method for a touch panel according to claim 4, wherein
the sensors are electrodes of which static capacitance is able to be measured, and
the measured values are values indicating static capacitance.

### Claim 6 (depends on 4)

The touched position detection method for a touch panel according to claim 4, wherein the selected sensors are a set of sensors located within a predetermined distance from the sensor showing a measured value higher than a predetermined level.