Indicator position detecting device and indicator position detecting method
First Claim
1. An indicator position detecting device, comprising:
- a conductor pattern that is composed of a plurality of conductors disposed along a first direction and a plurality of conductors disposed along a second direction intersecting with the first direction, the conductor pattern being configured to detect position indication by an indicator;
a multi-frequency signal supply circuit configured to supply N number of transmission signals at N different frequencies, respectively, selected from M number of different frequencies, to the plurality of conductors disposed along the first direction, where N and M are integers and M is greater than or equal to N;
a frequency analyzing circuit configured to be supplied with reception signals from the plurality of conductors disposed along the second direction and to carry out frequency analysis of each of the reception signals for N number of frequency components corresponding to said N number of transmission signals at N different frequencies;
an indicated-position detecting circuit configured to receive a result of the frequency analysis from the frequency analyzing circuit and to detect position indication by the indicator based on the received result of the frequency analysis;
a noise analyzing circuit configured to detect noise components in the reception signals at the N different frequencies; and
a control circuit configured to determine, based on the noise components detected by the noise analyzing circuit, whether the same set of the N different frequencies is to be supplied next or not from the multi-frequency signal supply circuit to the plurality of conductors disposed along the first direction.
1 Assignment
0 Petitions
Accused Products
Abstract
An indicator position detecting device and method are provided, which allow accurate position detection without the influence of noise in detection of the position of an indicator (e.g., a finger, a stylus pen) by a capacitive coupling system. To a conductor pattern in which plural conductors for signal transmission and plural conductors for signal reception intersect with each other, signals with frequencies different from each other are simultaneously supplied to the plural conductors on the transmission side, and signals of respective frequencies corresponding to the plural signals with the different frequencies are detected on the reception side, to thereby detect the position of an indicator on the conductor pattern. The amount of noise of each of the detected frequencies is detected. Any frequency that cannot be properly detected due to noise is switched to another frequency, and detection is carried out based on the newly selected frequency.
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Citations
21 Claims
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1. An indicator position detecting device, comprising:
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a conductor pattern that is composed of a plurality of conductors disposed along a first direction and a plurality of conductors disposed along a second direction intersecting with the first direction, the conductor pattern being configured to detect position indication by an indicator; a multi-frequency signal supply circuit configured to supply N number of transmission signals at N different frequencies, respectively, selected from M number of different frequencies, to the plurality of conductors disposed along the first direction, where N and M are integers and M is greater than or equal to N; a frequency analyzing circuit configured to be supplied with reception signals from the plurality of conductors disposed along the second direction and to carry out frequency analysis of each of the reception signals for N number of frequency components corresponding to said N number of transmission signals at N different frequencies; an indicated-position detecting circuit configured to receive a result of the frequency analysis from the frequency analyzing circuit and to detect position indication by the indicator based on the received result of the frequency analysis; a noise analyzing circuit configured to detect noise components in the reception signals at the N different frequencies; and a control circuit configured to determine, based on the noise components detected by the noise analyzing circuit, whether the same set of the N different frequencies is to be supplied next or not from the multi-frequency signal supply circuit to the plurality of conductors disposed along the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A position detecting method executed in a processor, the processor being utilized with a conductor pattern having a plurality of transmitting conductors extending in a direction and a plurality of receiving conductors extending in another direction, the method comprising:
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supplying N number of transmission signals at N different frequencies, respectively, selected from M number of different frequencies, to the plurality of transmitting conductors, where N and M are integers and M is greater than or equal to N; detecting an indicated position by obtaining N number of frequency components contained in a reception signal, which corresponds to said N number of transmission signals at N different frequencies, received by the receiving conductors; detecting noise components in the reception signal at the N different frequencies; and determining whether the same set of the N different frequencies is to be supplied next or not based on the noise components detected in the detecting step. - View Dependent Claims (15, 16)
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17. A processor, utilized with a conductor pattern having a plurality of transmitting conductors extending in a direction and a plurality of receiving conductors extending in another direction and a memory, the processor being configured to execute instructions stored in the memory, the instructions comprising the steps of:
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supplying N number of transmission signals at N different frequencies, respectively, selected from M number of different frequencies, to the plurality of transmitting conductors, where N and M are integers and M is greater than or equal to N; detecting an indicated position by obtaining N number of frequency components contained in a reception signal, which corresponds to said N number of transmission signals at N different frequencies, received by the receiving conductors; detecting noise components in the reception signal at the N different frequencies; and determining whether the same set of the N different frequencies is to be supplied next or not based on the noise components detected in the detecting step. - View Dependent Claims (18, 19, 20, 21)
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Specification