Rewritable thin image display sheet, image display, and image display system

A rewritable thin image display sheet comprising:

• a base layer;
• a transparent layer disposed apart from said base layer by a given distance;
• a medium filled in the space between said base layer and said transplant layer and containing a magnetic powder dispersed therein, said medium being adapted to be changeable between a first phase where said magnetic powder is allowed to be displaced and a second phase where said magnetic powder is prohibited from being displaced,
• wherein said medium is made of a wax which exhibits said first phase in a temperature range of 60 to 120° C. and said second phase at a lower temperature than the temperature at which said first phase is exhibited,
• said base layer includes a resistive layer and a pair of electrode layers each disposed to cover a corresponding one of the opposite surfaces of said resistive layer and formed with a matrix-shaped conductive pattern, said respective conductive patterns of said electrode layers have plural pairs of opposed intersection points to be selectively supplied with a current therebetween, whereby a current is passed through a region of said resistive layer located between the selected intersection points of said respective conductive patterns to selectively generate heat in said current-passing region of said resistive layer.

A rewritable thin image display sheet comprising:

• a first transparent layer;
• a second transparent layer disposed apart from said first transparent layer by a given distance;
• an intermediate heat-generation layer disposed between said first and second transparent layers and adapted to generate heat at an arbitrary position thereof;
• a first melting material filled in the space between said intermediate heat-generation layer and said first transparent layer;
• and
• a second melting material filled in the space between said intermediate heat-generation layer and said second transparent layer;
• and said first melting material and said second melting material containing a magnetic powder dispersed therein,
• said first melting material and said second melting material being adapted to be changeable between a first phase where said magnetic powder is allowed to be displaced and a second phase where said magnetic powder is prohibited from being displaced,
• said first melting material and said second melting material being made of a wax which exhibits said first phase in a temperature range of 60 to 120° C. and said second phase at a lower temperature than the temperature at which said first phase is exhibited,
• wherein said intermediate heat-generation layer includes a resistive layer and a pair of electrode layers each disposed to cover a corresponding one of the opposite surfaces of said resistive layer and formed with a matrix-shaped conductive pattern,
• said respective conductive patters of said electrode layers have plural pairs of opposed intersection points to be selectively supplied with a current therebetween,
• whereby a current is passed through a region of said resistive layer located between the selected intersection points of said respective conductive patterns to selectively generate heat in said current-passing region of said resistive layer.

A rewritable thin image display sheet comprising:

• a base layer;
• a transparent layer disposed apart from said base layer by a given distance;
• and
• a medium filled in the space between said base layer and said transparent layer and containing- a magnetic powder dispersed therein, said medium being adapted to be changeable between a first phase where said magnetic powder is allowed to be displaced and a second phase where said magnetic powder is prohibited from being displaced,
• wherein said base layer includes an electrode layer and a resistive layer,
• said electrode layer is an overall electrode covering over an inner surface of said resistive layer on the side of the said transparent layer,
• said resistive layer is a resin sheet having carbon loaded therein and has an outer surface which is entirely exposed,
• said medium is made of a wax which exhibits said first phase in a temperature range of 60 to 120° C. and said second phase at a lower temperature than the temperature at which said first phase is exhibited.