Pattern formed object for an electroluminescent display

• US 7,898,173 B2
• Filed: 10/30/2007
• Issued: 03/01/2011
• Est. Priority Date: 07/31/2002
• Status: Expired due to Fees

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Ito, Norihito, Ito, Nobuyuki
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US11/980,273
• Publication Number:
  US 20080067931A1
• Time in Patent Office: 1,218 Days
• Field of Search: 313504-506
• US Class Current: 313/506
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 71/135 using ink-jet printing
• CPC Class Codes: H10K 85/1135 Polyethylene dioxythiophene [PEDOT]; Derivatives thereof
• CPC Class Codes: H10K 85/146 poly N-vinylcarbazol; Derivatives thereof
• CPC Class Codes: H10K 85/60 Organic compounds having low molecular weight H10K85/10 - H10K85/50 take precedence
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: Y10S 428/917 Electroluminescent
• CPC Class Codes: Y10T 428/24777 Edge feature

Abstract

A pattern formed object for an electroluminescent element includes a substrate; partition walls provided on the substrate; and a coating stacked on the substrate in its part between the partition walls. The partition walls have a sloped liquid-nonrepellent surface and have such a sectional form that, at least in the lower part of the partition wall, as the distance from the substrate increases, the size of the partition wall in a direction parallel to the substrate decreases, and, in the coating, the ratio of the maximum thickness (Tmax) to the minimum thickness (Tmin), Tmax/Tmin, is not more than 130% as measured in the coating in its part between the lower ends of the partition walls adjacent to each other.

Claims

1. A pattern formed object comprising:

a substrate on which electrodes are provided with a space between the electrodes;

partition walls provided on the substrate on which the electrodes are provided and in the space between the electrodes; and

a coating formed on an upper surface of the electrodes provided on the substrate in its part between the partition walls, wherein

the coating comprises an EL light emitting layer formed by a dispenser method or an ink jet method,

said partition walls have a liquid-nonrepellent surface and have such a sectional form that, at least in a lower part of the partition wall, as the distance from the substrate increases, the size of the partition wall in a direction parallel to the substrate decreases,

the size of the partition walls in its part provided on the electrode in a direction parallel to the substrate is not less than 1 μ

m, and

in said coating, the ratio of the maximum thickness (Tmax) to the minimum thickness (Tmin), Tmax/Tmin, is not more than 130% as measured in the coating in its part between the lower ends of the partition walls adjacent to each other.

2. The pattern formed object according to claim 1, wherein the angle of the lower part of the partition wall to the substrate is not more than 60 degrees.

3. The pattern formed object according to claim 2, wherein each of the partition walls comprises a lower partition wall structure, which is provided on the substrate side and is in the form of a trapezoid, in section, with the long side being located on the substrate side, and an upper partition wall structure provided on the lower partition wall structure.

4. The pattern formed object according to claim 3, wherein the angle of the slope of the lower partition wall structure to the substrate is not more than 30 degrees.

5. The pattern formed object according to claim 3, wherein the distance between the lower part of the upper partition wall structure and the end of the lower partition wall structure on its substrate side as measured in a direction parallel to the substrate is not less than 1 μ

m.

6. The pattern formed object according to claim 3, wherein the height H₁ of the lower partition wall structure as measured in a direction perpendicular to the substrate and the height H₂ of the upper partition wall structure satisfy a requirement represented by H₂>

2×

H₁>

0.1 μ

m.

7. A pattern formed object for an electroluminescent element, comprising the pattern formed object according to any one of claims 1 to 6, said coating being an EL light emitting layer interposed between a first electrode and a second electrode.

8. The pattern formed object for an electroluminescent element according to claim 7, wherein said EL light emitting layer has a hole injection layer stacked on its substrate side.