Organic thin film display element

• US 5,144,473 A
• Filed: 03/29/1990
• Issued: 09/01/1992
• Est. Priority Date: 03/31/1989
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Miura, Akira, Naito, Katsuyuki, Aoki, Shinya, Nakayama, Toshio, Gemma, Nobuhiro, Azuma, Makoto, Egusa, Syun
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): SAADAT, MAHSHID D
• Application Number:
  US07/500,925
• Time in Patent Office: 887 Days
• Field of Search: 350/353, 350/355, 350/356, 350/357, 359/270, 359/272, 359/268
• US Class Current: 359/270
• CPC Class Codes: G02F 1/1533 structural features not otherwise provided for

Abstract

An organic thin film display element comprises a pair of electrodes, an organic thin film interposed between the electrodes and including both donor molecules and acceptor molecules, and an insulating layer having a relative dielectric constant of 10 or more, and interposed between at least one of the electrodes and the organic thin film.

Claims

1. An organic thin film display element, comprising:

a pair of electrodes;

an organic thin film interposed between said electrodes and including both donor molecules and acceptor molecules; and

an insulating layer having a relative dielectric constant of 10 or more, and interposed between at least one of said electrodes and said organic thin film.

2. The element according to claim 1, wherein said organic thin film has a super-lattice structure.

3. The element according to claim 1, wherein the product of the relative dielectric constant and the dielectric breakdown strength of said insulating layer is greater than the product of the relative dielectric constant and the dielectric breakdown strength of said organic thin film.

4. The element according to claim 3, wherein said insulating layer is formed of a ferroelectric or paraelectric inorganic compound.

5. The element according to claim 4, wherein said inorganic compound is one selected among the group consisting of SrTiO₃, Y₂ O₃, Ta₂ O₅, Sm₂ O₃, BaTiO₃, BaTa₂ O₆, PbTiO₃, Al₂ O₃, PbNb₂ O₆, ZrO₂, TiO₂, Bi₂ O₃, and ZnS.

6. The element according to claim 1, further comprising an insulating layer formed of a ferroelectric or paraelectric organic high molecular compound on said organic thin film.

7. The element according to claim 6, wherein said organic high molecular compound is a polyethylene derivative including at least one of a halogen, a cyano group, a hydroxyl group, an amino group, a carboxyl group, a nitro group, an ester group, and an ether group on a side chain;

or a condensation type high molecular compound consisting of at least one of a polyamide, a polyimide, a polyurethane, a polyester, a polycarbonate, a polyether, and a polythioether.

8. The element according to claim 1, wherein an insulating layer formed of a ferroelectric or paraelectric inorganic compound having a relative dielectric constant of 10 or more is arranged between the electrode under the organic thin film and the organic thin film, and an insulating layer formed of a ferroelectric or paraelectric organic high molecular compound is arranged between the organic thin film and the electrode above the organic thin film.

9. The element according to claim 1, wherein said pair of electrodes are arranged such that the pair of electrodes constitute lines perpendicular to each other.

10. The element according to claim 1, wherein one of said pair of electrodes consists of a non-linear element and a pixel electrode.

11. An organic thin film display element, comprising:

a pair of electrodes;

an organic thin film interposed between said electrodes and formed of a mixed stacked organic charge-transfer compound; and

an insulating layer having a relative dielectric constant of 10 or more, and interposed between at least one of said electrode sand said organic thin film.

12. The element according to claim 11, wherein the peak wavelength λ

_CT of a charge-transfer absorption band of the mixed stacked organic charge-transfer compound is 0.8 μ

m or more.