Macromolecular dispersion type liquid crystal display element and method of manufacturing the same
First Claim
1. A polymer dispersion type liquid crystal display element in which a polymer dispersion type liquid crystal is sandwiched between a pair of substrates each having an electrode at the inside thereof, said polymer dispersion type liquid crystal being such that liquid crystal droplets are dispersed and held in a continuous phase of matrix comprising polymer compound or are dispersed and held in networks of a three dimensional network form of matrix comprising polymer compound, wherein, when capacitance hysteresis in an operating temperature of said polymer dispersion type liquid crystal display element is defined by Chys=(C2−
- C1)/Cmax, the Chys for any applied voltage V is 1.5% or less, where C1 is capacitance for any applied voltage V, which is in the process of rising, of a voltage-capacitance characteristic;
C2 is capacitance for the applied voltage in the process of dropping; and
Cmax is capacitance for the maximum applied voltage.
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Abstract
A polymer dispersion type liquid crystal display element having a polymer dispersion type liquid crystal sandwiched between a pair of substrates, each having an inside electrode, is disclosed. The liquid crystal has liquid crystal droplets dispersed and held in either a polymer compound-containing continuous phase matrix or a three dimensional network of such a matrix. In one embodiment, the capacitance hysteresis, defined as Chys=(C2−C1)/Cmax, does not exceed 1.5%. C1 is the capacitance for an applied voltage that is in the process of rising a voltage-capacitance characteristic; C2 is the capacitance of an applied voltage in the process of dropping; and C2 is the capacitance of a maximum applied voltage. In another embodiment, the Chys value does not exceed 0.6% when the optical hysteresis Thys is (P2−P1)/Pmax where P1 is the intensity of transmitted light of an applied rising voltage V, P2 is the intensity of transmitted light of an applied dropping voltage, and Pmax is the intensity of transmitted light of a maximum applied voltage.
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Citations
39 Claims
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1. A polymer dispersion type liquid crystal display element in which a polymer dispersion type liquid crystal is sandwiched between a pair of substrates each having an electrode at the inside thereof, said polymer dispersion type liquid crystal being such that liquid crystal droplets are dispersed and held in a continuous phase of matrix comprising polymer compound or are dispersed and held in networks of a three dimensional network form of matrix comprising polymer compound, wherein, when capacitance hysteresis in an operating temperature of said polymer dispersion type liquid crystal display element is defined by Chys=(C2−
- C1)/Cmax, the Chys for any applied voltage V is 1.5% or less, where C1 is capacitance for any applied voltage V, which is in the process of rising, of a voltage-capacitance characteristic;
C2 is capacitance for the applied voltage in the process of dropping; and
Cmax is capacitance for the maximum applied voltage. - View Dependent Claims (2, 3, 4, 5, 25, 26, 27)
- C1)/Cmax, the Chys for any applied voltage V is 1.5% or less, where C1 is capacitance for any applied voltage V, which is in the process of rising, of a voltage-capacitance characteristic;
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6. A polymer dispersion type liquid crystal display element in which a polymer dispersion type liquid crystal is sandwiched between a pair of substrates each having an electrode at the inside thereof, said polymer dispersion type liquid crystal being such that liquid crystal droplets are dispersed and held in a continuous phase of matrix comprising polymer compound or are dispersed and held in networks of a three dimensional network form of matrix comprising polymer compound, wherein, when optical hysteresis Thys in an operating temperature range of said polymer dispersion type liquid crystal display element is defined by Thys=(P2−
- P1)/Pmax, where P1 is intensity of transmitted light for an any applied voltage V, which is in the process of rising, of a voltage-transmittance quantity characteristic;
P2 is intensity of transmitted light for the applied voltage in the process of dropping; and
Pmax is intensity of transmitted light for μ
maximum applied voltage, and further when capacitance hysteresis Chys in an operating temperature of said polymer dispersion type liquid crystal display element is defined by Chys=(C2−
C1)/Cmax, a value of the Chys for the applied voltage with which said Thys is maximized is 0.6% or less, where C1 is capacitance for any applied voltage V, which is in the process of rising, of a voltage-capacitance characteristic;
C2 is capacitance for the applied voltage in the process of dropping; and
Cmax is capacitance for the maximum applied voltage. - View Dependent Claims (7, 8, 9, 10, 12, 13, 28, 29, 30, 31, 32, 34, 35)
- P1)/Pmax, where P1 is intensity of transmitted light for an any applied voltage V, which is in the process of rising, of a voltage-transmittance quantity characteristic;
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11. A polymer dispersion type liquid crystal display element in which a polymer -liquid crystal complex in which droplets of liquid crystal are dispersed in a polymer compound is filled in a space between a pair of electrodes supported by substrates and covered with insulating films, wherein surface tension γ
- LC of said liquid crystal and critical surface tension γ
F of said insulating films meet the relation of Expression 4-1;
- View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 37, 38, 39)
- LC of said liquid crystal and critical surface tension γ
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14. A polymer dispersion type liquid crystal display element in which a polymer·
- liquid crystal complex in which droplets of liquid crystal are dispersed in a polymer compound is filled in a space between a pair of electrodes supported by substrates and covered with insulating films, wherein surface tension γ
LC of said liquid crystal and critical surface tension γ
F of said insulating films meet the relation of Expression 4-3;
- View Dependent Claims (33, 36)
- liquid crystal complex in which droplets of liquid crystal are dispersed in a polymer compound is filled in a space between a pair of electrodes supported by substrates and covered with insulating films, wherein surface tension γ
Specification