Touched position detection method for touch panel
View Patent ↗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.
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.
2. 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.
3. 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.
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.
5. 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.
6. 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.