DISPLAY DEVICE HAVING ORGANIC THIN FILM TRANSISTOR

• US 20090072226A1
• Filed: 04/30/2008
• Published: 03/19/2009
• Est. Priority Date: 09/18/2007
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Koo, Jae-Bon, Suh, Kyung-Soo, Kang, Seung-Youl
• Application Number:
  US12/112,646
• Publication Number:
  US 20090072226A1
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/125 including organic TFTs [OTFT]
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs

Abstract

Provided is a display device having an organic TFT. The display device includes the organic TFT on a substrate, a passivation layer covering the organic TFT, and a bank layer on the passivation layer. At this point, at least one of the passivation layer and the bank layer is formed of a material blocking light incident from a portion on the substrate to the organic TFT.

Claims

1. A display device comprising:

a substrate;

an organic thin film transistor (TFT) on the substrate;

a passivation layer covering the organic TFT; and

a bank layer on the passivation layer to define a shape of a pixel, at least one of the passivation layer and the bank layer being formed of a material blocking light incident from a portion on the substrate to the organic TFT.

2. The display device of claim 1, wherein at least one of the passivation layer and the bank layer comprises at least one of group consisting of metal oxides, metal nitrides, organic dielectrics, and polyimide-based resins that is configured to provide light transmittance of 5% or less.

3. The display device of claim 1, wherein at least one of the passivation layer and the bank layer comprises at least one of oxides of Mg, Al, Cr, Co, Ni, Pd, Ag, Au, Pt, Mo, and Ti, and carbon black-doped organic dielectrics.

4. The display device of claim 1, wherein the passivation layer covers a portion on the organic TFT to block light incident from the portion on the substrate to the organic TFT.

5. The display device of claim 1, further comprising an anode electrode disposed on the passivation layer, the anode electrode covering an upper region of the organic TFT to block light incident from the portion on the substrate to the organic TFT.

6. The display device of claim 1, further comprising an upper light blocking layer on an organic semiconductor layer, the upper light blocking layer being formed of a material that provides light transmittance of 5% or less.

7. The display device of claim 1, wherein the organic TFT comprises:

gate patterns on the substrate;

a dielectric layer on the gate patterns; and

an organic semiconductor layer on the dielectric layer, the gate patterns being formed of a conductive material having low light transmittance to block light incident from a portion below the substrate to the organic semiconductor layer.

8. The display device of claim 7, wherein the organic TFT further comprises source/drain patterns covering the upper surface of the dielectric layer on the edges of the gate patterns, the source/drain patterns extending between the dielectric layer and the organic semiconductor layer, or extending on the edge of the organic semiconductor layer.

9. A display device comprising:

a substrate;

an organic semiconductor layer on the substrate;

a dielectric layer on the organic semiconductor layer;

gate patterns on the dielectric layer to block light incident from a portion on the substrate; and

a lower light blocking layer under the organic semiconductor layer to block light incident from a portion below the substrate.

10. The display device of claim 9, wherein the lower light blocking layer comprises at least one combination of metal oxides, metal nitrides, organic dielectrics, and polyimide-based resins that is configured to provide light transmittance of 5% or less.