Active-driving type organic el display device, and a method of producing the same

• US 7,227,518 B2
• Filed: 05/24/2005
• Issued: 06/05/2007
• Est. Priority Date: 03/07/2000
• Status: Expired due to Term

• Current Assignee: Idemitsu Kosan Company Limited
• Original Assignee: Idemitsu Kosan Company Limited
• Inventors: Eida, Mitsuru
• Primary Examiner(s): Hjerpe; Richard
• Assistant Examiner(s): NGUYEN, KIMNHUNG T
• Application Number:
  US11/135,341
• Publication Number:
  US 20050218819A1
• Time in Patent Office: 742 Days
• Field of Search: 345 76- 82, 345/169.1, 345/169.3, 345/169.4, 345 45- 47, 315/169.1, 315/169.3, 315/169.4
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/08 Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8792 comprising light absorbing layers, e.g. black layers
• CPC Class Codes: H10K 85/141 comprising aliphatic or olefinic chains, e.g. poly N-vinylcarbazol, PVC or PTFE

Abstract

An organic EL display device and a method of producing the same wherein superior connection reliability can be obtained between a thin film transistor and a lower electrode of an organic EL element even if a color-converting medium is provided adjacent light-emitting face of the organic EL element. For this purpose, in an active-driving type organic EL display device comprising an organic EL element made so as to have an organic luminous medium sandwiched between an upper electrode and a lower electrode, and a thin film transistor for controlling luminescence of the organic EL element, the luminescence of the organic EL element is taken out from the lower electrode, a color-converting medium is provided adjacent the lower electrode, and an inclined electrically connecting member is set between the lower electrode and the thin film transistor.

Claims

1. An active-driving type organic EL display device, comprising an organic EL element made to have an organic luminous medium sandwiched between an upper electrode and a lower electrode, and a thin film transistor for controlling luminescence of the organic EL element, wherein

the luminescence of the organic EL element is taken out from the lower electrode,

a color-converting medium is provided on a side of the lower electrode, and

the lower electrode is connected to the thin film transsitor by an inclined electrically connecting member across a level difference between the lower electrode and the thin film transistor, the level difference being generated by the color-converting medium.

2. The active-driving type organic EL display device according to claim 1, wherein a flattening film is formed between the color-converting medium and the lower electrode.

3. The active-driving type organic EL display device according to claim 2, wherein the flattening film acts as an oblique meznber for inclining the electrically connecting member.

4. The active-driving type organic EL display device according to claim 2, wherein the flattening film comprises an inorganic substance.