Electrophoretic display device and method of driving electrophoretic display device
First Claim
1. An electrophoretic display device, comprising:
- a first substrate;
a second substrate arranged to face the first substrate with a gap therebetween;
a dispersion liquid including an insulating liquid and electrophoretic fine particles dispersed in the insulating liquid, said dispersion liquid being applied in the gap;
first and second control electrode segments formed on the first substrate;
a counter electrode segment formed on the second substrate; and
a voltage applying circuit configured to apply a voltage to the control electrode segments and the counter electrode segment so as to produce first and second potential changes on the first and second control electrode segments, respectively.
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Abstract
An electrophoretic display device comprises substrates faced to each other so as to form a pixel space therebetween. A first electrode group including control electrode segments is formed on the substrate, and a second electrode group including a counter electrode segment is formed on the substrate. A dispersion liquid of colored and charged fine particles dispersed in an insulating liquid is charged in the pixel space. The fine particles are collected on the first and second electrode groups so as to permit different colors to be displayed on the pixel. A first voltage is applied to a control electrode segment and a second voltage applied to the other control electrode segments so as to cause the colored and charged fine particles to be migrated at a uniform migration speed to the control electrode segments, thereby collecting the colored and charged fine particles on the control electrode segments.
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Citations
22 Claims
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1. An electrophoretic display device, comprising:
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a first substrate;
a second substrate arranged to face the first substrate with a gap therebetween;
a dispersion liquid including an insulating liquid and electrophoretic fine particles dispersed in the insulating liquid, said dispersion liquid being applied in the gap;
first and second control electrode segments formed on the first substrate;
a counter electrode segment formed on the second substrate; and
a voltage applying circuit configured to apply a voltage to the control electrode segments and the counter electrode segment so as to produce first and second potential changes on the first and second control electrode segments, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An electrophoretic display device, comprising:
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a first substrate;
a second substrate arranged to face the first substrate with a gap therebetween;
a dispersion liquid including an insulating liquid and electrophoretic fine particles dispersed in the insulating liquid, the dispersion liquid being applied in the gap;
first and second control electrode segments formed on the first substrate;
a counter electrode segment formed on the second substrate; and
a voltage applying circuit configured to apply a voltage to the control electrode segments and the counter electrode segment so as to produce first and second potential changes on the first and second control electrode segments, respectively, said voltage applying circuit including;
first and second impedance elements having first and second impedances and connected to the first and second control electrode segments, respectively;
a first switching element connected to the first and second control electrode segments through the first and second impedance elements;
a switching control section configured to control the switching element; and
a voltage source for applying voltage between the first and second control electrode segments and the counter electrode segment via the switching element and the first and second impedance elements. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of driving an electrophoretic display device, said electrophoretic display device comprising:
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a first substrate;
a second substrate arranged to face the first substrate with a gap provided therebetween;
a dispersion liquid including an insulating liquid and electrophoretic fine particles dispersed in the insulating liquid, said dispersion liquid being applied in the gap;
first and second control electrode segments formed on the first substrate; and
a counter electrode segment formed on the second substrate;
said driving method comprising applying a voltage to the first and second control electrode segments and the counter electrode segment so as to produce first and second potential changes on the first and second control electrode segments.
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Specification