Color filter for organic electroluminescence display device, and organic electroluminescence display device

Patent metadata

Field	Value
Publication number	US-9647229-B2
Application number	US-201214353552-A
Country	US
Kind code	B2
Filing date	Oct 25, 2012
Priority date	Oct 26, 2011
Publication date	May 9, 2017
Grant date	May 9, 2017

Abstract

When a large-screen organic EL display device is developed, the generation of a brightness unevenness is prevented between its screen central region and its screen outer circumferential region. Cost risk is decreased about the formation of a structure of preventing the generation of the brightness unevenness. Furthermore, an original protecting function for its organic EL elements is maintained. The color filter of the present invention comprises a transparent substrate, a colored layer that is a pixel region formed on the transparent substrate, and a non-pixel area formed around the colored layer, wherein a convex pillar is formed in at least one spot of the non-pixel area, and an auxiliary electrode layer on a top and a side of the convex pillar, and on the non-pixel area.

First claim

The invention claimed is:

1. A color filter for organic electroluminescence display device,
which is used in an organic electroluminescence display device using, as a light emitting source,
light from an organic EL layer of an organic electroluminescence element, wherein the color filter for organic electroluminescence display device comprises a transparent substrate,
a colored layer that is a pixel region formed on the transparent substrate, a non-pixel area formed around the colored layer,
a convex pillar formed in at least one spot of the non-pixel area and an auxiliary electrode layer formed on a top and a side of the convex pillar, and on the non-pixel area,
wherein the auxiliary electrode layer has a metal auxiliary electrode layer and a transparent electrode layer,
the metal auxiliary electrode layer is arranged into a linear pattern in the non-pixel area, the convex pillar is formed on the non-pixel area in which the metal auxiliary electrode layer is linearly arranged, and
the transparent electrode layer is formed to cover the top and the side of the convex pillar, and the non-pixel area, and contact the metal auxiliary electrode layer,
wherein a light shielding part is formed in the non-pixel area on the transparent substrate,
an overcoat layer is formed to cover the light shielding part and the colored layer,
the metal auxiliary electrode layer and the transparent electrode layer are formed on the overcoat layer,
at least one singly-colored layer of the colored layers is laid on an entire surface of the light shielding part in the non-pixel area between the colored layers,
the convex pillar is formed on the metal auxiliary electrode layer which is on the light shielding part where the colored layer is laid, and
the transparent electrode layer formed on the top of the convex pillar is exposed outside so as to contact an upper-side transparent electrode layer in the organic electroluminescence element.

2. The color filter for organic electroluminescence display device according to claim 1 , wherein the transparent electrode layer is formed to cover an entire surface of the metal auxiliary electrode layer.

3. The color filter for organic electroluminescence display device according to claim 1 , wherein
a light shielding part is formed in an outside-display-region light shielding region formed around its display region,
the metal auxiliary electrode layer is formed on the light shielding part,
the transparent electrode layer is formed to cover the metal auxiliary electrode layer formed in the outside-display-region light shielding region, and
the metal auxiliary electrode layer formed in the outside-display-region light shielding region has plural openings.

4. The color filter for organic electroluminescence display device according to claim 1 , wherein the auxiliary electrode layer has a transparent electrode layer, and the transparent electrode layer is formed to cover the top and the side of the convex pillar and the non-pixel area.

5. The color filter for organic electroluminescence display device according to claim 1 , wherein the auxiliary electrode layer has a metal auxiliary electrode layer, the metal auxiliary electrode layer is linearly arranged in the non-pixel area, and is further arranged continuously and linearly on the side and the top of the convex pillar formed in the non-pixel area.

6. The color filter for organic electroluminescence display device according to claim 1 , wherein the auxiliary electrode layer is formed as an electroconductive light shielding part formed in the non-pixel area.

7. The color filter for organic electroluminescence display device according to claim 1 , wherein the non-pixel area has a cross part at which a line in a lengthwise direction crosses a line in a lateral direction, and the convex pillar is present at the cross part.

8. The color filter for organic electroluminescence display device according to claim 1 , wherein the convex pillar is formed in a tapered shape having a diameter that decreases gradually from a base side toward the top of the convex pillar.

9. The color filter for organic electroluminescence display device according to claim 1 , wherein the color filter for organic electroluminescence display device has one or plural convex pillars, and D 1 >D 2 is satisfied in a comparison between D 1 and D 2 , in which D 1 representing an arrangement density of the convex pillar(s) arranged in a central region of the transparent substrate, and D 2 representing an arrangement density of the convex pillar(s) arranged in the other outer circumferential region of the transparent substrate.

10. An organic electroluminescence display device, comprising the colored filter for organic electroluminescence display device recited in claim 1 , and
an organic-EL-element-side substrate having a substrate, and an organic electroluminescence element containing an organic EL layer formed on the substrate, wherein:
the color filter for organic electroluminescence display device and the organic-EL-element-side substrate are arranged to oppose the colored layer and the organic electroluminescence element to each other;
the organic electroluminescence element comprises the organic EL layer, a lower-side electrode layer and an upper-side transparent electrode layer that are paired and arranged to sandwich the organic EL layer therebetween, and a sealing layer formed on the upper-side transparent electrode layer to cover the organic electroluminescence element; and
the sealing layer has a concave into which a tip portion of the convex pillar formed in the color filter for organic electroluminescence display device can be fitted so that a portion of the auxiliary electrode layer that is formed on the top of the convex pillar contacts the upper-side transparent electrode layer to attain electrical conduction therebetween.

11. The organic electroluminescence display device according to claim 10 , wherein a part of the sealing layer where the concave is made is a gap portion between adjacent organic EL layers.

12. The organic electroluminescence display device according to claim 10 , wherein a depth of the concave is such a depth that the concave reaches to the upper-side transparent electrode layer.

13. The organic electroluminescence display device according to claim 10 , wherein an electroconductive film is formed on a side of the concave.

14. The organic electroluminescence display device according to claim 10 , wherein a TFT for controlling an electric current flowing the organic electroluminescence element is formed for each organic electroluminescence element on the substrate of the organic-EL-element-side substrate.

15. The organic electroluminescence display device according to claim 10 , wherein a light emitting layer included in the organic EL layer is a white light emitting layer.

Assignees

• Dainippon Printing Co Ltd

Inventors

• Nakazawa Shinsuke
• Hino Kazuyuki

Classifications

• H10K59/8792

  comprising light absorbing layers, e.g. black layers · CPC title

• H10K59/1213

  the pixel elements being TFTs · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/38 Primary

  comprising colour filters or colour changing media [CCM] · CPC title