Coordinate Detecting Apparatus, Display Apparatus and Coordinate Detecting Method
First Claim
1. A coordinate detecting apparatus which detects a position of a point on a panel which point is designated by an operator, the coordinate detecting apparatus comprising:
- a surface resistor which is provided on the panel and has a substantially rectangular shape;
a plurality of current detecting means, connected respectively to connection points of an outer peripheral portion of the surface resistor, for detecting currents flowing through the connection points; and
coordinate calculating means for, based on values of currents flowing through two of the current detecting means which are connected respectively to two connection points provided respectively on two sides of the outer peripheral portion of the surface resistor which two sides face each other, calculating a coordinate component of the designated point on an axis obtained by connecting the two connection points on the surface resistor.
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Abstract
In a panel (1a) of a touch panel (1), a coordinate axis x is set by connecting points A and B that are current observation points. When a designated point P is designated on the panel (1a), currents (i1) and (i2) corresponding respectively to a distance between the designated point P and the point A and a distance between the designated point P and the point B flow respectively to a resistive film between the points P and A and a resistive film between the points P and B by voltage sources (e1) and (e2), and a sum of these currents flows to an impedance Z connected to the designated point P. A coordinate x of the designated point P is calculated by detecting the currents (i1) and (i2).
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Citations
11 Claims
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1. A coordinate detecting apparatus which detects a position of a point on a panel which point is designated by an operator, the coordinate detecting apparatus comprising:
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a surface resistor which is provided on the panel and has a substantially rectangular shape; a plurality of current detecting means, connected respectively to connection points of an outer peripheral portion of the surface resistor, for detecting currents flowing through the connection points; and coordinate calculating means for, based on values of currents flowing through two of the current detecting means which are connected respectively to two connection points provided respectively on two sides of the outer peripheral portion of the surface resistor which two sides face each other, calculating a coordinate component of the designated point on an axis obtained by connecting the two connection points on the surface resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A display apparatus, comprising a coordinate detecting apparatus which detects a position of a point on a panel which point is designated by an operator, the coordinate detecting apparatus comprising:
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a surface resistor which is provided on the panel and has a substantially rectangular shape; a plurality of current detecting means, connected respectively to connection points of an outer peripheral portion of the surface resistor, for detecting currents flowing through the connection points; and coordinate calculating means for, based on values of currents flowing through two of the current detecting means which are connected respectively to two connection points provided respectively on two sides of the outer peripheral portion of the surface resistor which two sides face each other, calculating a coordinate component of the designated point on an axis obtained by connecting the two connection points on the surface resistor.
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11. A method for detecting coordinates of a designated point, the method being used by a coordinate detecting apparatus including:
- a surface resistor having a substantially rectangular shape; and
a plurality of current detecting means which are connected respectively to connection points provided at an end portion of the surface resistor, and through each of which, when a point is designated on the surface resistor, a current corresponding to a distance between the connection point and the point flows,the method comprising the steps of; detecting, when an operator designates a point on the surface resistor, values of currents flowing through two connection points which are provided respectively on two sides of the outer peripheral portion of the surface resistor which two sides face each other; and calculating, based on the two values of currents detected in the detecting step, a coordinate component of the designated point on an axis obtained by connecting the two connection points.
- a surface resistor having a substantially rectangular shape; and
Specification