Display-integrated coordinate input device
First Claim
1. A display-integrated coordinate input device comprising:
- a matrix panel having more than one row electrode (y direction), more than one column electrode (x direction) and a display element sealed between said row electrodes and said column electrodes;
a row electrode device circuit for driving said row electrodes;
a column electro de d rive circuit for driving said column electrodes;
a detection electrode for detecting scanning signals applied to said row electrodes and said column electrodes by electrically coupling said row electrodes and said column electrodes with electrostatic coupling capacity;
a coordinate detection circuit for obtaining positional information from output signal s of said detection electrode;
a correction circuit for correcting coordinates output from said coordinate detection circuit;
a multiplication circuit for multiplying the corrected coordinates output from said correction circuit and for outputting detection coordinates for each x, y position of the matrix panel; and
a control circuit for controlling said matrix panel, said row electrode drive circuit, said column electrode drive circuit, said detection electrode, said coordinate detection circuit and said correction circuit;
wherein said row electrodes are disposed at right angles to said column electrodes; and
wherein the coordinate detection circuit comprises a first coordinate detection circuit and a second coordinate detection circuit;
wherein said first coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by the detection electrode exceeds a predetermined relative potential;
wherein said second coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by said detection electrode falls below the predetermined relative potential; and
wherein the correction circuit comprises an arithmetic circuit for operating the positions of the detection electrode from two coordinate values transmitted from said coordinate detection circuit.
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Accused Products
Abstract
A liquid crystal module comprises a liquid crystal panel including mutually orthogonal row electrodes and column electrodes and a liquid crystal layer sealed between the electrodes as a display element, a row electrode driving circuit driving the row electrodes of the liquid crystal panel, and a column electrode driving circuit driving the column electrodes. A detecting electrode detects scanning signals applied to the row and column electrodes of the liquid crystal panel by electrically coupling to the electrodes with electrostatic coupling capacity. A coordinate detecting circuit converts the signals obtained from the detecting electrode into row and column coordinates. A correction arithmetic circuit corrects positional differences by using correction parameters of the device which have been obtained from output values of the coordinate detecting circuit beforehand. The display-integrated coordinate input device improves detection precision at the edges of a matrix panel.
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Citations
26 Claims
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1. A display-integrated coordinate input device comprising:
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a matrix panel having more than one row electrode (y direction), more than one column electrode (x direction) and a display element sealed between said row electrodes and said column electrodes; a row electrode device circuit for driving said row electrodes; a column electro de d rive circuit for driving said column electrodes; a detection electrode for detecting scanning signals applied to said row electrodes and said column electrodes by electrically coupling said row electrodes and said column electrodes with electrostatic coupling capacity; a coordinate detection circuit for obtaining positional information from output signal s of said detection electrode; a correction circuit for correcting coordinates output from said coordinate detection circuit; a multiplication circuit for multiplying the corrected coordinates output from said correction circuit and for outputting detection coordinates for each x, y position of the matrix panel; and a control circuit for controlling said matrix panel, said row electrode drive circuit, said column electrode drive circuit, said detection electrode, said coordinate detection circuit and said correction circuit; wherein said row electrodes are disposed at right angles to said column electrodes; and wherein the coordinate detection circuit comprises a first coordinate detection circuit and a second coordinate detection circuit;
wherein said first coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by the detection electrode exceeds a predetermined relative potential;
wherein said second coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by said detection electrode falls below the predetermined relative potential; and
wherein the correction circuit comprises an arithmetic circuit for operating the positions of the detection electrode from two coordinate values transmitted from said coordinate detection circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display-integrated coordinate input device comprising:
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a matrix panel having more than one row electrode (y direction), more than one column electrode (x direction) and a display element sealed between said row electrodes and said column electrodes; a row electrode device circuit for driving said row electrodes; a column electrode drive circuit for driving said column electrodes; a detection electrode for detecting scanning signals applied to said row electrodes and said column electrodes by electrically coupling said row electrodes and said column electrodes with electrostatic coupling capacity; a coordinate detection circuit for obtaining positional information from output signals of said detection electrode; a correction circuit for correcting coordinates output from said coordinate detection circuit; and a control circuit for controlling said matrix panel, said row electrode drive circuit, said column electrode drive circuit, said detection electrode, said coordinate detection circuit and said correction circuit; wherein said row electrodes are disposed at right angles to said column electrodes; and wherein the coordinate detection circuit comprises a first coordinate detection circuit, a second coordinate detection circuit and a third coordinate detection circuit;
wherein said first coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by the detection electrode exceeds a predetermined relative potential;
wherein said second coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by said detection electrode falls below the predetermined relative potential;
wherein said third coordinate detection circuit is a magnitude comparator which changes its output as soon as a signal detected by the detection electrode reaches a maximum value; and
wherein the correction circuit comprises an arithmetic circuit which calculates the position of the detection electrode from three coordinate values transmitted from said first coordinate detection circuit, said second coordinate detection circuit and said third coordinate detection circuit. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A display-integrated coordinate input device comprising:
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a matrix panel having more than one row electrode (y direction), more than one column electrode (x direction), dummy electrodes which are electrically insulated from said column electrodes and said row electrodes and are formed between tabs at a leading section of said matrix panel, and a display element sealed between said row electrodes and said column electrodes; a row electrode drive circuit for driving said row electrodes; a column electrode drive circuit for driving said column electrodes; a dummy electrode drive circuit connected to said dummy electrodes which outputs a fixed voltage in a coordinate detection period; a detection electrode for detecting scanning signals applied to said row electrodes and said column electrodes by electrically coupling said row electrodes and said column electrodes with electrostatic coupling capacity; a coordinate detection circuit for obtaining positional information from output signals of said detection electrode; and a control circuit for controlling said matrix panel, said row electrode drive circuit, said column electrode drive circuit, said dummy electrode drive circuit, said detection electrode, and said coordinate detection circuit; wherein said row electrodes are disposed at right angles to said column electrodes. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A display-integrated coordinate input device comprising:
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a matrix panel having more than one row electrode (y direction) and more than one column electrode (x direction); a row electrode drive circuit which applies a row scanning pulse for display in response to driving conditions of said matrix panel in a display period, and supplies, by switching, a row detecting pulse for coordinate detection having a constant amplitude in a detection period, regardless of driving conditions of said display period; a column electrode drive circuit which applies a column scanning pulse for display in response to driving conditions of said matrix panel in a display period, and supplies, by switching, a column detecting pulse for coordinate detection having a constant amplitude in a detection period, regardless of driving conditions of said display period; a drive power circuit which supplies voltage at a level required for driving said column electrodes and row electrodes to said column electrode drive circuit and said row electrode drive circuit; a detection electrode for detecting scanning signals for detection applied to said row electrodes and said column electrodes by electrically coupling said row electrodes and said column electrodes with electrostatic coupling capacity; a multiplication circuit for multiplying coordinates obtained as the positional information by said coordinate detection circuit and for outputting detection coordinates for each x, y position of the matrix panel; and a control circuit for controlling said matrix panel, said row electrode drive circuit, said column electrode drive circuit, said drive power circuit, said multiplication circuit and said detection electrode; wherein said row electrodes are disposed at right angles to said column electrodes. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification