Image display medium driving method and image display device
First Claim
1. A driving method for an image display medium, the image display medium having a plurality of facing substrates of which at least a display-side substrate is transparent, a unit cell delimited between the substrates, and at least two types of particle groups of different color and charge characteristics sealed inside the unit cells, the driving method comprising the steps of:
- producing a color display by applying a particle drive voltage pulse of a saturation voltage, the saturation voltage being high enough to saturate the color density of the at least one particle group of the at least two particle group types that moves to the display-side substrate as a result of a field produced by applying voltage to a unit cell; and
producing a transparent display by applying a particle drive voltage pulse of an absolute voltage greater than the saturation voltage so that the two particle group types inside the unit cells agglomerate and make the unit cell transparent.
2 Assignments
0 Petitions
Accused Products
Abstract
An image display device and driving method thereof produce a multiple color display without inviting a drop in resolution, or with the drop in resolution suppressed. Between a back substrate and a transparent display substrate forming the image display surface, the image display part has in order a display electrode on which a transparent surface coating is formed, a spacer, and a back electrode on which a surface coating is formed. A voltage control part applies a −350 V dc voltage, for example, to the display electrode to display black by black particles, applies an approximately +350 dc voltage to the display electrode to display white by white particles, and applies, for example, a +/−500 V particle drive voltage pulse repeatedly to the display electrode to make the black and white particles clump together inside the unit cell, thereby making the unit cell transparent to produce a transparent display.
-
Citations
14 Claims
-
1. A driving method for an image display medium, the image display medium having a plurality of facing substrates of which at least a display-side substrate is transparent, a unit cell delimited between the substrates, and at least two types of particle groups of different color and charge characteristics sealed inside the unit cells, the driving method comprising the steps of:
-
producing a color display by applying a particle drive voltage pulse of a saturation voltage, the saturation voltage being high enough to saturate the color density of the at least one particle group of the at least two particle group types that moves to the display-side substrate as a result of a field produced by applying voltage to a unit cell; and
producing a transparent display by applying a particle drive voltage pulse of an absolute voltage greater than the saturation voltage so that the two particle group types inside the unit cells agglomerate and make the unit cell transparent. - View Dependent Claims (2, 3, 5, 6)
-
-
4. A driving method for an image display medium, the image display medium having a transparent display substrate, a back substrate disposed opposite the display substrate with a gap therebetween, and two types of particles of different color and charge characteristics sealed between the substrates so that particles can move between the substrates when a field is applied therebetween, wherein the color particles are driven by means of at least two particle drive voltage pulses, including:
-
a first particle drive voltage pulse for producing a color display by applying a saturation voltage causing particles of at least one color to adhere to the display substrate, the saturation voltage being high enough so that the color density of particles of the one color of the at least two particle types is saturated; and
a second particle drive voltage pulse for producing a transparent display by causing particles to agglomerate.
-
-
7. An image display device comprising:
-
a plurality of facing substrates of which at least a display-side substrate is transparent;
a support member disposed between each of the plural substrates and delimiting a unit cell;
particle groups of at least two types sealed in the unit cell, having different color and charge characteristics, and moving in mutually opposite directions between the substrates in response to an applied field;
a pair of electrodes disposed between the plurality of facing substrates to form a field in the unit cell; and
display control means for displaying the color of at least one of the particle groups by applying a particle drive voltage pulse of a saturation voltage, the saturation voltage being high enough so that the color of the at least one particle group of the at least two particle groups that moves to the display side substrate due to the applied field reaches a saturation density, and producing a transparent display by applying a particle drive voltage pulse of an absolute voltage greater than the saturation voltage so that the two particle group types inside the unit cells agglomerate and make the unit cell transparent. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
-
Specification