Write point detecting circuit to detect multiple write points
First Claim
1. A coordinate input device comprising:
- a write point detecting circuit repetitively detecting and outputting first coordinates and second coordinates, wherein a pair of coordinates including a first coordinate and a second coordinate defines a position of a respective write point; and
a coordinate determining circuit determining coordinates of write points on the basis of the output of the write point detecting circuit, wherein in case plural first coordinates and/or plural second coordinates are detected and outputted by the write point detecting circuit for a single selected period, said plural coordinates yielding a greater number of potential write points than an actual number of write points for the period, said coordinate determining circuit compares a time of detection of the plural first coordinates and the time of detection of the plural second coordinates for each potential write point and selects for the actual write points, respective pairs of coordinates each comprising a first coordinate and a second coordinate that have the shortest times between the detection of the first and the second coordinate of the pair by the write point detecting circuit.
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Accused Products
Abstract
A coordinate input device that selects actual write points from coordinates that can be combined in different ways to define a greater number of potential write points. In the example of detecting X-coordinates and Y-coordinates that can be combined into X,Y pairs defining potential write points, the device identifies as X,Y pairs for actual write pairs the X,Y combinations that are most likely to correspond to actual write points, based on factors such as the time of detection of an X-coordinate relative to the times of detection of Y-coordinates (or vice versa), or the distances between actual points found in a preceding time period and the potential points of a current time period, or the distances between coordinates of actual points found in a preceding time period and corresponding coordinates of potential write points identified in a current time period.
185 Citations
30 Claims
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1. A coordinate input device comprising:
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a write point detecting circuit repetitively detecting and outputting first coordinates and second coordinates, wherein a pair of coordinates including a first coordinate and a second coordinate defines a position of a respective write point; and
a coordinate determining circuit determining coordinates of write points on the basis of the output of the write point detecting circuit, wherein in case plural first coordinates and/or plural second coordinates are detected and outputted by the write point detecting circuit for a single selected period, said plural coordinates yielding a greater number of potential write points than an actual number of write points for the period, said coordinate determining circuit compares a time of detection of the plural first coordinates and the time of detection of the plural second coordinates for each potential write point and selects for the actual write points, respective pairs of coordinates each comprising a first coordinate and a second coordinate that have the shortest times between the detection of the first and the second coordinate of the pair by the write point detecting circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An image display system comprising:
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a write point detecting circuit detecting first coordinates and second coordinates of potential write points, each potential write point defined by a respective pair of a first coordinate and a second coordinate, said potential write points including a lesser number of actual write points, and providing an output related to the detected coordinates; and
a coordinate determining circuit determining coordinates of the actual write points on the basis of the output of the write point detecting circuit and providing an output related to said coordinates, a display circuit displaying image data on the basis of the output of said coordinate determining means;
wherein if coordinates corresponding to plural potential write points are detected within a selected time period by the write point detecting circuit, said coordinate determining circuit selects pairs of a first and a second coordinate each of the actual write points based on the times at which the first and second coordinates of the pair were detected by the write point detecting circuit by comparing a time of detection of the plural first coordinates and the time of detection of the plural second coordinates for each potential write point, said coordinate determining circuit selecting for the actual write points, respective pairs of coordinates each comprising a first coordinate and a second coordinate that have the shortest times between the detection of the first and the second coordinate of pair by the write point detecting circuit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
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an input device having a panel for indicating actual write points;
a coordinate detector operating for each of a succession of time intervals to identify a first coordinate and a second coordinate for each actual write point indicated for the respective time interval, wherein said coordinates provide combinations of a first and a second coordinate each for potential write points whose number exceeds the number of the actual write points;
a selector processing said coordinates to select the actual write points for the time interval from among the potential write points through calculations making use of the times of detection of the first and second coordinates by the coordinate detector for each of the combinations of the first and the second coordinate for the potential write points, said selector identifying pairs of a first and a second coordinate each that define the positions of said actual write points, said selector selecting for the actual write points, respective pairs of coordinates each comprising a first coordinate and a second coordinate that have the shortest times between the detection of the first and the second coordinate of the pair by the coordinate detector; and
a display circuit using said pairs of coordinates. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A method comprising:
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indicating actual write points on a panel;
for each of a succession of time intervals, detecting a first coordinate and a second coordinate for each actual write point indicated for the respective time interval, wherein said coordinates provide combinations of a first and a second coordinate each for potential write points whose number exceeds that of the actual write points;
processing said coordinates to select the actual write points for the time interval from among the potential write points through calculations making use of the times of detection of the first and second coordinates for the respective time interval for each of the combinations of the first and the second coordinate for the potential write points, to thereby identify pairs of a first and a second coordinate identifying the positions of said actual write points for the time interval, said processing selecting for the actual write points, respective pairs of coordinates each comprising a first coordinate and a second coordinate that have the shortest times between the detection of the first and the second coordinate of the pair; and
using said pairs of coordinates in a display operation. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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Specification