Coordinate input device
First Claim
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1. A coordinate input device comprising:
- a coordinate detector including;
a first insulating layer which is transparent;
a second insulating layer which is transparent and which is formed on a lower surface of the first insulating layer;
a first electrode layer having a plurality of transparent electrodes formed in parallel and between the lower surface of the first insulating layer and an upper surface of the second insulating layer;
a second electrode layer having a plurality of transparent electrodes which are aligned in parallel and which extend in a direction orthogonal to the transparent electrodes of the first electrode layer, the second electrode layer being formed on a lower surface of the second insulating layer; and
a third insulating layer which is transparent and which is formed on a lower surface of the second electrode layer, anda controller which is electrically connected to the two electrode layers of the coordinate detector so as to drive and control the electrode layers and which has a correction circuit to remove electrostatic capacitance noise that disturbs the coordinate detector, the controller including a reference signal storing circuit to store a reference signal, which is a detection signal obtained by scanning the electrodes of the first electrode layer and the second electrode layer while no operation is performed and a correction value calculating circuit to subtract the reference signal from a detection signal while an operation is performed, thereby correcting the detection signal during the operation.
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Abstract
A coordinate input device includes a coordinate input element. The coordinate input element includes a transparent coordinate detector and a controller having a control circuit which drives and controls the coordinate detector and which corrects electrostatic capacitance noise disturbing the coordinate detector. The coordinate input device also includes a liquid crystal display device provided on the back side of the coordinate input element, a casing for holding the coordinate input element and the liquid crystal display device, and an L-shaped and a reverse L-shaped push button switches provided on the upper surface of the casing.
73 Citations
27 Claims
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1. A coordinate input device comprising:
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a coordinate detector including; a first insulating layer which is transparent; a second insulating layer which is transparent and which is formed on a lower surface of the first insulating layer; a first electrode layer having a plurality of transparent electrodes formed in parallel and between the lower surface of the first insulating layer and an upper surface of the second insulating layer; a second electrode layer having a plurality of transparent electrodes which are aligned in parallel and which extend in a direction orthogonal to the transparent electrodes of the first electrode layer, the second electrode layer being formed on a lower surface of the second insulating layer; and a third insulating layer which is transparent and which is formed on a lower surface of the second electrode layer, and a controller which is electrically connected to the two electrode layers of the coordinate detector so as to drive and control the electrode layers and which has a correction circuit to remove electrostatic capacitance noise that disturbs the coordinate detector, the controller including a reference signal storing circuit to store a reference signal, which is a detection signal obtained by scanning the electrodes of the first electrode layer and the second electrode layer while no operation is performed and a correction value calculating circuit to subtract the reference signal from a detection signal while an operation is performed, thereby correcting the detection signal during the operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A coordinate input device comprising:
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a coordinate detector including; a first insulating layer which is transparent; a second insulating layer which is transparent and which is formed on a lower surface of the first insulating layer; a first electrode layer having a plurality of transparent electrodes formed in parallel and between the lower surface of the first insulating layer and an upper surface of the second insulating layer; a second electrode layer having a plurality of transparent electrodes which are aligned in parallel and which extend in a direction orthogonal to the transparent electrodes of the first electrode layer, the second electrode layer being formed on a lower surface of the second insulating layer; and a third insulating layer which is transparent and which is formed on a lower surface of the second electrode layer, a display device placed on a back side of the coordinate detector, and a flexible wiring board that connects the coordinate detector and a controller of the coordinate input device, the flexible wiring board placed on a side of the display device such that the controller is placed on a back side of the display device, wherein the controller is electrically connected to the two electrode layers of the coordinate detector so as to drive and control the electrode layers and which has a correction circuit to remove electrostatic capacitance noise that disturbs the coordinate detector, the controller including a reference signal storing circuit to store a reference signal, which is a detection signal obtained by scanning the electrodes of the first electrode layer and the second electrode layer while no operation is performed and a correction valued calculating circuit to subtract the reference signal from a detection signal while an operation is performed, thereby correcting the detection signal during the operation, wherein a scanning frequency for scanning the electrodes of the coordinate input device is different from a driving frequency of the display device. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification