Information holding device
AssigneeHitachi, Ltd.
InventorsMasaaki Kitajima, Hideaki Kawakami, Yoshiharu Nagae, Masahiro Takasaka
Life of this patent
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Abstract
An information holding device comprising a pair of substrates whose opposing surfaces are formed with electrodes on one side and electrodes on the other side so that they may oppose and that opposing parts between the electrodes on the one side and those on the other side may form a matrix as a whole, a dielectric which is held between said pair of substrates, means to change a capacitance of the dielectric in any desired one of the opposing parts, and detection means to simultaneously detect the capacitances of at least two of the opposing parts between the electrodes on the one side and those on the other side.
Claims10
An information holding device comprising a pair of substrates whose opposing surfaces are formed with M electrodes on one side and N electrodes divided into K blocks (2.ltoreq.L<N/2) on the other side so that they oppose and that opposing parts between electrodes on the one side and those on the other side may form a matrix as a whole, a dielectric which is held between said pair of substrates and between the opposing parts, the dielectric having a capacitance, means to change the capacitance of the dielectric between at least any desired one of the opposing parts, and K detection means to simultaneously detect the capacitance of the dielectric between the opposing parts of any desired electrode on the one side and any desired electrode of each block on the other side, each of said K detection means including means to apply a voltage varying with time to said dielectric between said at least two opposing parts, and means to simultaneously detect principally displacement currents flowing through said dielectric between said at least two opposing parts.
An information holding device for at least one of inputting, outputting, and displaying information, comprising:
- a pair of substrates having opposing surfaces, one substrate being formed with M plurality of electrodes and the other substrate being formed with N plurality of electrodes divided into K blocks (2.ltoreq.K.ltoreq.N/2) so that the plurality of electrodes on the respective substrates are in opposition and opposing parts between the opposing electrodes form a matrix as a whole, each block including a plurality of N electrodes;
- a dielectric for enabling display of information and being held between said pair of substrates and between the opposing parts, the dielectric having a capacitance;
- means to change a capacitance of the dielectric between at least any desired one of the opposing parts;
- and
- K detection means for simultaneously detecting the capacitance of the dielectric between the opposing parts of any desired electrode on said one substrate and any desired electrode of each block on said other substrate so as to enable high speed readout of information, each of said K detection means including means to apply a voltage varying with time to said dielectric between said at least two opposing parts, and means to simultaneously detect principally displacement currents flowing through said dielectric between said at least two opposing parts.
Dependencies are inferred from the claim text.