Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1987-09-25
1989-06-20
Yusko, Donald J.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340706, 340712, 178 19, G06K 916
Patent
active
048412902
ABSTRACT:
In a display unit comprising a plate-shaped display panel with X-Y matrix electrodes consisting of two groups of electrodes, X-axis electrodes and Y-axis electrodes, display signals are applied to the X-Y matrix electrodes, a.c. current is applied to at least one group of electrodes one after another, and the phase of the a.c. current is compared with that of the output of an input pen having means for detecting the magnetic flux induced by the a.c. current, so that the position of the input pen on the display panel is detected from the result of the comparison.
REFERENCES:
patent: 3530241 (1970-09-01), Ellis
patent: 3674928 (1972-07-01), Yoshiyama et al.
patent: 4117471 (1978-09-01), Schlig et al.
patent: 4471162 (1984-09-01), Aono et al.
Nakano et al., IEEE Transactions on Consumer Electronics, vol. CE-33, No. 3, Aug. 1987, pp. 367-374.
Iwata Syuji
Nakano Masaaki
Saito Yusaku
Watanabe Syoyu
Mitsubishi Denki & Kabushiki Kaisha
Oberley Alvin
Yusko Donald J.
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