Image display medium, image writing device, and image forming apparatus

1. An image display medium comprising:

a display layer including a display region whose display state changes by electrical action;

a pair of substrates that retain the display layer therebetween, with at least part of the pair of substrates configuring a frame portion to which an electrical connection connector for electrical connection to the outside connects, and with at least one of the pair of substrates being transparent;

a first scan electrode group that is a group of electrodes disposed across the overall display region along a column direction of the display region on the surface of one of the pair of substrates facing the display layer;

a second scan electrode group that is a group of electrodes disposed across the overall display region along a row direction of the display region on the surface of the other of the pair of substrates facing the display layer;

a first electrical contact group disposed at a place on the pair of substrates to which the electrical connection connector connects;

a second electrical contact group disposed at a place on the pair of substrates to which the electrical connection connector connects;

a first connection wire group that electrically connects the first electrical contact group and the first scan electrode group to each other; and

a second connection wire group that electrically connects the second electrical contact group and the second scan electrode group to each other,

wherein the first electrical contact group and the second electrical contact group are disposed apart from each other a distance that is greater than the distance between two mutually adjacent contacts belonging to the first electrical contact group or the second electrical contact group along at least one of a thickness direction and a surface direction of the pair of substrates.

2. The image display medium of claim 1 , wherein the first electrical contact group and the second electrical contact group are formed on the same surface side and are disposed separate from each other along the thickness direction, with a step being formed therebetween.

3. The image display medium of claim 1 , wherein a plurality of contacts that configure at least one of the first electrical contact group and the second electrical contact group are two-dimensionally disposed on the same surface of the substrates.

4. The image display medium of claim 2 , wherein at least parts of the first connection wire group and the second connection wire group are formed inside the frame portion of the pair of substrates, and the first connection wire group and the second connection wire group are formed separate from each other in the thickness direction of the frame portion with the first connection wire group being formed on the side of the frame portion where the first electrical contact group is formed and the second connection wire group being formed on the side of the frame portion where the second electrical contact group is formed.

5. The image display medium of claim 2 , wherein the first scan electrode group is disposed on a substrate of the pair of substrates on an image viewing side where an image formed in the display region is viewed, the second scan electrode group is disposed on a substrate of the pair of substrates on the opposite side of the image viewing side, and at least part of the first connection wire group is disposed on the opposite side of the side where the second scan electrode group is disposed.

6. The image display medium of claim 2 , wherein the first electrical contact group and the second electrical contact group are disposed separate from each other along the surface direction.

7. The image display medium of claim 1 , wherein the frame portion includes a plurality of through holes through which a plurality of guide pins disposed on the electrical connection connector pass.

8. The image display medium of claim 1 , wherein the through holes are formed at positions away from an extension line of a step between the first electrical contact group and the second electrical contact group.

9. The image display medium of claim 1 , wherein a image selection drive circuit that selects electrodes in the first scan electrode group and the second scan electrode group and controls the display state of the display region is disposed on the outside, is connected to the first scan electrode group via the electrical connection connector, the first electrical contact group, and the first connection wire group, and is connected to the second scan electrode group via the electrical connection connector, the second electrical contact group, and the second connection wire group.

10. An image display medium comprising:

a display layer including a display region whose display state changes by electrical action;

a pair of substrates that retain the display layer therebetween, with at least parts of the pair of substrates configuring a frame portion to which an electrical connection connector for electrical connection to the outside connects, and with at least one of the pair of substrates being transparent;

a first scan electrode group that is a group of electrodes disposed across the overall display region along a column direction of the display region on the surface of one of the pair of substrates facing the display layer;

a second scan electrode group that is a group of electrodes disposed across the overall display region along a row direction of the display region on the surface of the other of the pair of substrates facing the display layer; and

an electrical contact group that is disposed at a place on the pair of substrates to which the electrical connection connector connects and is electrically connected to the first and second scan electrode groups,

wherein the electrical contact group is divided into a plurality of regions by a step in a thickness direction.

11. An image writing device for causing the image display medium of claim 2 to display an image, the image writing device comprising:

a signal processor that generates a control signal that selects electrodes in the first scan electrode group and the second scan electrode group with which the image display medium is disposed;

an electrical connection connector that connects to the image display medium;

a contact terminal group that is disposed on the electrical connection connector, is electrically connected to the first electrical contact group and the second electrical contact group with which the image display medium is disposed when the electrical connection connector is connected to the image display medium, and supplies the control signal generated by the signal processor to the first scan electrode group and the second scan electrode group; and

a positioning portion that is disposed on the electrical connection connector and engages with the step in the image display medium to regulate the positional relationship between the image display medium and the electrical connection connector when the electrical connection connector is connected to the image display medium.

12. The image writing device of claim 11 , wherein an anisotropic conductive material that conducts electricity only in the thickness direction is disposed on the side of the contact terminal group with which the electrical connection connector is disposed that connects to the first electrical contact group and the second electrical contact group.

13. An image forming apparatus comprising:

the image display medium of claim 2 ; and

an image writing device for causing the image display medium to display an image, the image writing device comprising:

a signal processor that generates a control signal that selects electrodes in the first scan electrode group and the second scan electrode group with which the image display medium is disposed;

an electrical connection connector that connects to the image display medium;

a contact terminal group that is disposed on the electrical connection connector, is electrically connected to the first electrical contact group and the second electrical contact group with which the image display medium is disposed when the electrical connection connector is connected to the image display medium, and supplies the control signal generated by the signal processor to the first scan electrode group and the second scan electrode group; and

a positioning portion that is disposed on the electrical connection connector and engages with the step in the image display medium to regulate the positional relationship between the image display medium and the electrical connection connector when the electrical connection connector is connected to the image display medium, and

wherein the image writing device electrically connects to the image display medium and causes the image display medium to display an image.

14. An image forming apparatus comprising:

the image display medium of claim 2 ; and

an image writing device for causing the image display medium to display an image, the image writing device comprising:

a signal processor that generates a control signal that selects electrodes in the first scan electrode group and the second scan electrode group with which the image display medium is disposed;

an electrical connection connector that connects to the image display medium;

a contact terminal group that is disposed on the electrical connection connector, is electrically connected to the first electrical contact group and the second electrical contact group with which the image display medium is disposed when the electrical connection connector is connected to the image display medium, and supplies the control signal generated by the signal processor to the first scan electrode group and the second scan electrode group; and

a positioning portion that is disposed on the electrical connection connector and engages with the step in the image display medium to regulate the positional relationship between the image display medium and the electrical connection connector when the electrical connection connector is connected to the image display medium, and

wherein an anisotropic conductive material that conducts electricity only in the thickness direction is disposed on the side of the contact terminal group with which the electrical connection connector is disposed that connects to the first electrical contact group and the second electrical contact group, and

wherein the image writing device electrically connects to the image display medium and causes the image display medium to display an image.