Coordinate input device detecting touch on board associated with liquid crystal display, and electronic device therefor
First Claim
1. A coordinate input device for inputting coordinates on a screen of a display, comprising:
- a board providing a coordinate input surface;
a plurality of vibration detectors that are arranged on the board or in a periphery of the coordinate input surface, wherein each of the vibration detectors detects vibration or sound that occurs when a position input member is brought into contact with the coordinate input surface of the board at an arbitrary input position, the vibration detectors each outputting a vibration detection signal at a timing corresponding to the detection of the vibration or sound;
a time difference determiner that determines a time difference between timing of a vibration detection signal from one of the vibration detectors and timing of a vibration detection signal from another of the vibration detectors; and
a calculation device that performs calculations based on the time difference determined by the time difference determiner in order to determine the input position at which the vibration occurs on the coordinate input surface of the board.
1 Assignment
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Accused Products
Abstract
A coordinate input device is associated with a liquid crystal display to detect a touch or contact thereon. A transparent board is arranged on the screen of the display to provide a coordinate input surface having a substantially rectangular shape. At least one vibration detector (e.g., a microphone or piezoelectric element) is attached onto the board to detect vibration or sound that occurs when a position input member is brought into contact with the coordinate input surface at an arbitrary input position. The input position is represented as one-dimensional coordinate based on outputs of two vibration detectors, or it is represented as two-dimensional coordinates based on outputs of three vibration detectors. Thus, the manually designated input position is detected and is electronically displayed on the screen of the display. As the position input member, it is possible to use a pen, a fingernail, etc.
46 Citations
11 Claims
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1. A coordinate input device for inputting coordinates on a screen of a display, comprising:
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a board providing a coordinate input surface; a plurality of vibration detectors that are arranged on the board or in a periphery of the coordinate input surface, wherein each of the vibration detectors detects vibration or sound that occurs when a position input member is brought into contact with the coordinate input surface of the board at an arbitrary input position, the vibration detectors each outputting a vibration detection signal at a timing corresponding to the detection of the vibration or sound; a time difference determiner that determines a time difference between timing of a vibration detection signal from one of the vibration detectors and timing of a vibration detection signal from another of the vibration detectors; and a calculation device that performs calculations based on the time difference determined by the time difference determiner in order to determine the input position at which the vibration occurs on the coordinate input surface of the board. - View Dependent Claims (2, 3, 4)
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5. A coordinate input device for inputting coordinates on a screen of a display, comprising:
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a board providing a coordinate input surface that has a substantially rectangular shape; a plurality of vibration detectors that are arranged in proximity to prescribed corners of the coordinate input surface of the board, each of the vibration detectors detecting vibration or sound that occurs when a position input member is brought into contact with the coordinate input surface of the board at an arbitrary input position; and calculation means for performing calculations based on vibration detection signals respectively output from the plurality of vibration detectors, thus producing one-dimensional coordinate or two-dimensional coordinates as representation of the input position at which the vibration occurs on the coordinate input surface of the board, a plurality of vibration inducing projections being arranged on the coordinate input surface of the board, the vibration-inducing projections inducing vibration of the coordinate input surface when contacted by a non-vibrating position input member.
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6. An electronic device comprising:
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a display; and a coordinate input device that comprises a transparent board attached onto a screen of the display, the transparent board having a coordinate input surface substantially having a rectangular shape, at least one vibration detector that is arranged on the transparent board or in a periphery of the coordinate input surface, the vibration detector detecting vibration or sound generated by contact between a non-vibrating position input member and the coordinate input surface of the transparent board at an arbitrary input position, and calculation means for performing calculations based on a vibration detection signal output from the vibration detector, thus producing coordinate information as a representation of the input position at which the vibration occurs on the coordinate input surface of the transparent board, the input position being displayed on the screen of the display based on the coordinate information produced by the calculation means. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification