EP0154263A2
Expired / Lapsed
EP
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Information input/output display device
Assignee: Hitachi Ltd
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Filing: 1985-02-22
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Granted: —
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Expires: 2005-02-22
Abstract
Abstract An information input output display device comprising a dielectric (6,20) which is held in a portion between one electrode (18) and an other electrode (19) opposite to each other and which has at least a first state and a second state of unequal capacitances, means (7,8;25,26) to change the capacitance of the dielectric, capacitance holding means (11) to hold at least temporarily a value of the capacitance of the dielectric in the first state, and means (12) to compare the value of the capacitance of the dielectric with the value of the capacitance held by the capacitance holding means (11), whereby information can be read out without being affected by fluctuations in a distance d between the electrodes oriand in an ambient temperature T.
Inventors
- 👤 Masaaki Kitajima
- 👤 Masahiro Takasaka
- 👤 Yoshiharu Nagae
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 16:02
CPC Classifications
G; G11; G11C; G11C11/00; G11C11/21; G11C11/26; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G11C11/22; G09G2320/00; G09G2320/04; G09G2320/041
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
99 words
An information input/output display device comprising a dielectric which is held in a portion between one electrode and the other electrode opposite to each other and which has at least a first state and a second state of unequal capacitaces, means to change the capacitance of said dielectric, means to detect the capacitance of said dielectric, capacitance holding means to hold at least temporarily a value of the capacitance of.said dielectric in the first state, and means to compare the value of the capacitance of said dielectric with the value of the capacitance held by said capacitance holding means.
Claim 2
Dependent Claim
99 words
An information input/output display device comprising a dielectric which is held in a portion between one electrode and the other electrode opposite to each other and which has at least a first state and a second state of unequal capacitaces, means to change the capacitance of said dielectric, means to detect the capacitance of said dielectric, capacitance holding means to hold at least temporarily a value of the capacitance of.said dielectric in the first state, and means to compare the value of the capacitance of said dielectric with the value of the capacitance held by said capacitance holding means.
Claim 3
Dependent Claim
51 words
An information input/output display device according to Claim 1, wherein said dielectric is a dielectric whose capacitance is changed by applying an electric field, heat or the like and is further stored without changing for a fixed period of time even after removing the electric field, the heat or the like.
Claim 4
Dependent Claim
20 words
An information. input/output display device according to Claim 2, wherein said dielectric is a liquid crystal having a smectic phase.
Claim 5
Dependent Claim
25 words
An information input/output display device according to Claim 1, wherein said means to change the capacitance of said dielectric is means to heat said dielectric.
Claim 6
Dependent Claim
53 words
An information input/output display device according to Claim 1, wherein said means to detect the capacitance of said dielectric is composed of means to apply a voltage changing with time to said dielectric in the opposite portion, and means to detect principally a displacement current flowing through said dielectric in said opposite portion.
Claim 7
Dependent Claim
22 words
An information input/output display device according to Claim 5, wherein the voltage changing with time is a voltage whose dV/dt is constant.
Claim 8
Dependent Claim
31 words
An information input/output display device according to Claim 5, wherein the voltage changing with time is a voltage of such a magnitude that the capacitance of said dielectric is hardly changed.
Claim 9
Dependent Claim
189 words
An information input/output display device comprising a dielectric which is held in portions between a plurality of electrodes on one side and a plurality of electrodes on the other side opposite to one another, with the opposite portions forming a matrix of M rows and N columns as a whole, and which has at least a first state and a second state of unequal capacitances, means to change the capacitance of said dielectric in any desired one of the opposite portions, means to detect the capacitance of said dielectric in the desired opposite portion, capacitance holding means to divide the matrix of M rows and N columns into k (1≦ k < M x N) blocks and to hold at least temporarily a value of the capacitance of said dielectric in the first state held in any desired one of the opposite portions included in said each block, and means to compare the value of the capacitance of said dielectric in the desired opposite portion with the value of the capacitance held by said capacitance holding means corresponding to the block of said dielectric in said desired opposite portion.
Claim 10
Dependent Claim
189 words
An information input/output display device comprising a dielectric which is held in portions between a plurality of electrodes on one side and a plurality of electrodes on the other side opposite to one another, with the opposite portions forming a matrix of M rows and N columns as a whole, and which has at least a first state and a second state of unequal capacitances, means to change the capacitance of said dielectric in any desired one of the opposite portions, means to detect the capacitance of said dielectric in the desired opposite portion, capacitance holding means to divide the matrix of M rows and N columns into k (1≦ k < M x N) blocks and to hold at least temporarily a value of the capacitance of said dielectric in the first state held in any desired one of the opposite portions included in said each block, and means to compare the value of the capacitance of said dielectric in the desired opposite portion with the value of the capacitance held by said capacitance holding means corresponding to the block of said dielectric in said desired opposite portion.
Claim 11
Dependent Claim
51 words
An information input/output display device according to Claim 8, wherein said dielectric is a dielectric whose capacitance is changed by applying an electric field, heat or the like and is further stored without changing for a fixed period of time even after removing the electric field, the heat or the like.
Claim 12
Dependent Claim
20 words
An information input/output display device according to Claim 9, wherein said dielectric is a liquid crystal having a smectic phase.
Claim 13
Dependent Claim
25 words
An information input/output display device according to Claim 8, wherein said means to change the capacitance of said dielectric is means to heat said dielectric.
Claim 14
Dependent Claim
53 words
An information input/output display device according to Claim 8, wherein said means to detect the capacitance of said dielectric is composed of means to apply a voltage changing with time to said dielectric in the opposite portion, and means to detect principally a displacement current flowing through said dielectric in said opposite portion.
Claim 15
Dependent Claim
22 words
An information input/output display device according to Claim 12, wherein the voltage changing with time is a voltage whose dV/dt is constant.
Claim 16
Dependent Claim
31 words
An information input/output display device according to Claim 12, wherein the voltage changing with time is a voltage of such a magnitude that the capacitance of said dielectric is hardly changed.
Claim 17
Dependent Claim
54 words
An information input/output display device according to Claim 8, wherein said means to detect the capacitancesof said dielectric in any desired opposite simultaneously portions is means to / detect the capacitances of the opposite portions of the electrodes on one side and the electrodes on the other side corresponding to at least two rows.
References Cited (Backward Citations)
No citation records indexed.
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