POINTER DETECTION APPARATUS AND POINTER DETECTION METHOD
First Claim
1. A pointer detection apparatus for detecting a pointer positioned on a conductor pattern, the conductor pattern including a plurality of first conductors disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction, the pointer detection apparatus comprising:
- a code supplying circuit configured to provide a plurality of modulated code strings of different codes, the code supplying circuit being further configured to supply predetermined ones of the modulated code strings to the first conductors disposed in the first direction;
a correlation calculation code supplying circuit configured to supply correlation calculation codes that respectively correspond to the code strings; and
a correlation calculation circuit configured to demodulate signals produced in the second conductors disposed in the second direction to produce demodulated signals and to carry out correlation calculation between the demodulated signals and the correlation calculation codes;
wherein the pointer positioned on said conductor pattern is detected based on results of the correlation calculation carried out by said correlation calculation circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A pointer detection apparatus and a pointer detection method of the cross point electrostatic coupling type are disclosed, by which a pointer on a conductor pattern can be detected at a higher speed. The pointer detection apparatus includes a conductor pattern, a spread code supplying circuit, a reception conductor selection circuit, an amplification circuit, an analog to digital conversion circuit, and a correlation value calculation circuit. The spread code supplying circuit supplies a plurality of spread codes at the same time. The correlation value calculation circuit determines correlation values between signals output from the analog to digital conversion circuit and the correlation calculation codes respectively corresponding to the spread codes. A pointer is detected based on the determined correlation values.
-
Citations
16 Claims
-
1. A pointer detection apparatus for detecting a pointer positioned on a conductor pattern, the conductor pattern including a plurality of first conductors disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction, the pointer detection apparatus comprising:
-
a code supplying circuit configured to provide a plurality of modulated code strings of different codes, the code supplying circuit being further configured to supply predetermined ones of the modulated code strings to the first conductors disposed in the first direction; a correlation calculation code supplying circuit configured to supply correlation calculation codes that respectively correspond to the code strings; and a correlation calculation circuit configured to demodulate signals produced in the second conductors disposed in the second direction to produce demodulated signals and to carry out correlation calculation between the demodulated signals and the correlation calculation codes; wherein the pointer positioned on said conductor pattern is detected based on results of the correlation calculation carried out by said correlation calculation circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A pointer detection apparatus for detecting a pointer positioned on a conductor pattern, the conductor pattern including a plurality of first conductors disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction, the pointer detection apparatus comprising:
-
a code supplying circuit configured to provide a plurality of modulated code strings of different codes, the code supplying circuit being further configured to supply predetermined ones of the modulated code strings to the first conductors disposed in the first direction; and a correlation calculation circuit configured to demodulate signals produced in the second conductors disposed in the second directions to produce demodulated signals and to carry out correlation calculation between the demodulated signals and correlation calculation codes that respectively correspond to the code strings; wherein the pointer positioned on said conductor pattern is detected based on correlation calculation values determined by said correlation calculation circuit.
-
-
16. A pointer detection method for detecting a pointer positioned on a conductor pattern, the conductor pattern including a plurality of first conductors disposed in a first direction and a plurality of second conductors disposed in a second direction which crosses the first direction, the method comprising:
-
a code supplying step for providing a plurality of modulated code strings of different codes and supplying predetermined ones of the modulated code strings to the first conductors disposed in the first direction; a correlation calculation code supplying step for supplying correlation calculation codes that respectively correspond to the code strings; a correlation calculation processing step for demodulating signals produced in the second conductors disposed in the second direction to produce demodulated signals and for carrying out correlation calculation between the demodulated signals and the correlation calculation codes; and a position detection step for detecting the pointer positioned on the conductor pattern based on results of the correlation calculation carried out at the correlation calculation processing step.
-
Specification