Electrochromic display device
First Claim
1. An electrochromic display device comprising:
- an electrolyte held between two substrates at least one of which is transparent;
a display electrode formed on a surface of one of said substrates and including an electrochromic substance film, said surface being in contact with said electrolyte;
a first counter electrode formed on a counter surface of the other of said substrates, said counter surface being spaced from and facing said display electrode;
a second counter electrode formed on a face of one of said two substrates, said face being in contact with said electrolyte;
means for selectively applying a voltage between said display electrode and said first counter electrode to effect the coloration of said display electrode;
means for selectively intermittently applying a voltage between said first counter electrode and said second counter electrode to effect removal of a minus ion layer which forms in the vicinity near said first counter electrode; and
means for alternately changing the application of the voltage from between said display electrode and said first counter electrode to the application of the voltage between said first counter electrode and said second counter electrode.
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Accused Products
Abstract
An electrochromic display device comprises; an electrolyte held between two substrates at least one of which is transparent. A display electrode is formed on a surface of one substrate and has an electrochromic substance film formed thereon, the surface being in contact with the electrolyte. A first counter electrode is formed on a counter surface of the other substrate in opposed spaced-apart relationship with respect to the display electrode, and a second counter electrode is formed on a face of either one of the substrates, the face being in contact with the electrolyte. Circuitry applies a first voltage between the display electrode and the first counter electrode to effect coloration of the display electrode, and applies a second voltage between the first and second counter electrodes to establish an electric field therebetween effective to remove a negative ion region which forms in the vicinity of the first counter electrode during coloration of the display electrode.
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Citations
11 Claims
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1. An electrochromic display device comprising:
- an electrolyte held between two substrates at least one of which is transparent;
a display electrode formed on a surface of one of said substrates and including an electrochromic substance film, said surface being in contact with said electrolyte;
a first counter electrode formed on a counter surface of the other of said substrates, said counter surface being spaced from and facing said display electrode;
a second counter electrode formed on a face of one of said two substrates, said face being in contact with said electrolyte;
means for selectively applying a voltage between said display electrode and said first counter electrode to effect the coloration of said display electrode;
means for selectively intermittently applying a voltage between said first counter electrode and said second counter electrode to effect removal of a minus ion layer which forms in the vicinity near said first counter electrode; and
means for alternately changing the application of the voltage from between said display electrode and said first counter electrode to the application of the voltage between said first counter electrode and said second counter electrode. - View Dependent Claims (2, 3)
- an electrolyte held between two substrates at least one of which is transparent;
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4. A method for driving an electrochromic display device comprised of an electrolyte held between two substrates at least one of which is transparent;
- a display electrode formed on a surface of one substrate and having an electrochromic substance film, said surface being in contact with said electrolyte;
a first counter electrode formed on a counter surface of the other substrate, said counter surface being spaced from and facing said display electrode;
a second counter electrode formed on a face of one of the two substrates, said face being in contact with said electrolyte; and
means for intermittently applying a voltage between said first counter electrode and said second counter electrode, said method comprising the steps of;
applying a voltage between said display electrode and said first electrode to effect the coloration of said display electrode accompanied by formation of a minus ion layer in the vicinity near the first counter electrode;
electrically floating said display electrode after coloration thereof; and
then applying a voltage between said first counter electrode and said second counter electrode to remove a minus ion layer which forms in the vicinity near said first counter electrode.
- a display electrode formed on a surface of one substrate and having an electrochromic substance film, said surface being in contact with said electrolyte;
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5. In an electrochromic display device having an electrolyte contained between two spaced-apart substrates:
- a set of display segments disposed on the surface of one substrate and in contact with the electrolyte, each display segment comprised of a display electrode and an electrochromic substance;
a first counter electrode disposed on the surface of the other substrate and in contact with the electrolyte;
a second counter electrode disposed on the surface of one of the two substrates and in contact with the electrolyte;
first voltage applying means for selectively applying a voltage between preselected display electrodes and the first counter electrode to effect coloration of the preselected display electrodes accompanied by formation of a negative ion region in the electrolyte in the vicinity near the first counter electrode; and
second voltage applying means for selectively applying a voltage between the first counter electrode and the second counter electrode to establish an electric field between the first and second counter electrodes effective to remove the negative ion region thereby increasing the coloration response speed of the electrochromic display device. - View Dependent Claims (6, 7, 8, 9, 10, 11)
- a set of display segments disposed on the surface of one substrate and in contact with the electrolyte, each display segment comprised of a display electrode and an electrochromic substance;
Specification