Optical switching element and photoaddressable display medium using the same

• US 7,903,324 B2
• Filed: 08/12/2003
• Issued: 03/08/2011
• Est. Priority Date: 11/29/2002
• Status: Expired due to Fees

• Current Assignee: Fujifilm Business Innovation Corp. (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Xerox Holdings Corp.)
• Inventors: Kobayashi, Hideo, Hikichi, Takehito
• Primary Examiner(s): Stultz, Jessica T
• Assistant Examiner(s): Sahle, Mahidere S
• Application Number:
  US10/638,296
• Publication Number:
  US 20040105614A1
• Time in Patent Office: 2,765 Days
• Field of Search: 359/320, 345/81, 345/97, 345/204, 345/206
• US Class Current: 359/320
• CPC Class Codes: G02F 1/1354 having a particular photoconducting structure or material

Abstract

An optical switching element including at least a multi-layered optical switching layer that includes a charge generation layer and a charge transport layer wherein, the charge transport layer contains a charge transporting material represented by the following general formula (1). The optical switching element is applicable in a device, a photoaddressable display medium and a display device. The optical switching element may alternatively include a mono-layered optical switching layer that has a charge generating function and a charge transporting function, wherein the mono-layered optical switching layer contains the charge transporting material represented by the following general formula (1).

Claims

1. A photoaddressable display medium, comprising:

a pair of electrodes, at least one of which has optical transparency;

an optical switching element; and

a display element including a display layer having a memory effect,

wherein

the optical switching element comprises;

a multi-layered optical switching layer that contains a charge generation layer and a charge transport layer;

or

a mono-layered optical switching layer that has a charge generating function and a charge transporting function,

wherein the charge transport layer or the mono-layered optical switching layer contains a charge transporting material represented by the following general formula (1);

2. The photoaddressable display medium of claim 1, wherein the charge transporting material is contained in the charge transport layer at a concentration of 30% to 90% by weight.

3. The photoaddressable display medium of claim 1, wherein the charge transporting material is contained in the charge transport layer at a concentration of 45% to 80% by weight.

4. The photoaddressable display medium of claim 1, wherein the charge transporting material is contained in the charge transport layer at a concentration of 50% to 70% by weight.

5. A display device, comprising:

the photoaddressable display medium of claim 1;

a unit for driving the display medium; and

a unit for optically writing to the display medium.

6. A photoaddressable display medium, comprising:

a pair of electrodes, at least one of which has optical transparency;

an optical switching element wherein

the optical switching element comprises;

a multi-layered optical switching layer that contains a charge generation layer and a charge transport layer;

or

a mono-layered optical switching layer that has a charge generating function and a charge transporting function,

wherein the charge transport layer or the mono-layered optical switching layer contains a charge transporting material represented by the following general formula (2);

7. A display device, comprising:

the photoaddressable display medium of claim 6;

a unit for driving the display medium; and

a unit for optically writing to the display medium.

8. The photoaddressable display medium of claim 6, wherein R¹ and R³ each represent CH₃, and R² and R⁴ each represent C₂H₅.

9. A display device, comprising:

the photoaddressable display medium of claim 8;

a unit for driving the display medium; and

a unit for optically writing to the display medium.

10. The photoaddressable display medium of claim 6, wherein the charge transporting material is contained in the charge transport layer at a concentration of 30% to 90% by weight.

11. The photoaddressable display medium of claim 6, wherein the charge transporting material is contained in the charge transport layer at a concentration of 45% to 80% by weight.

12. The photoaddressable display medium of claim 6, wherein the charge transporting material is contained in the charge transport layer at a concentration of 50% to 70% by weight.