Display unit
First Claim
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1. A display unit with position detecting capabilities, said display unit comprising:
- a flat-plate-shaped display panel having X-Y matrix electrodes consisting of two groups of electrodes which are arranged in a crossed-grid fashion to cover a major portion of said display panel;
display-signal applying means for applying display signals to said X-Y matrix electrodes;
current applying means for applying a current having a.c. components to at least one group of said X-Y matrix electrodes in such a manner that said current is sequentially applied to respective one of said electrodes in said at least one group, in a predetermined sequential order;
an input pen with magnetic flux detecting means for detecting magnetic flux associated with a current flowing in an electrode at a matrix location where said input pen is applied;
phase comparison means for comparing a phase of said current applied to said electrodes with that of an output signal of said magnetic flux detecting means; and
position detecting means for detecting the position of said input pen on said display panel according to an output signal of said phase comparison means.
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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.
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Citations
2 Claims
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1. A display unit with position detecting capabilities, said display unit comprising:
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a flat-plate-shaped display panel having X-Y matrix electrodes consisting of two groups of electrodes which are arranged in a crossed-grid fashion to cover a major portion of said display panel; display-signal applying means for applying display signals to said X-Y matrix electrodes; current applying means for applying a current having a.c. components to at least one group of said X-Y matrix electrodes in such a manner that said current is sequentially applied to respective one of said electrodes in said at least one group, in a predetermined sequential order; an input pen with magnetic flux detecting means for detecting magnetic flux associated with a current flowing in an electrode at a matrix location where said input pen is applied; phase comparison means for comparing a phase of said current applied to said electrodes with that of an output signal of said magnetic flux detecting means; and position detecting means for detecting the position of said input pen on said display panel according to an output signal of said phase comparison means. - View Dependent Claims (2)
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Specification