Full-color organic electro-luminescent display device

• US 20060044226A1
• Filed: 08/13/2003
• Published: 03/02/2006
• Est. Priority Date: 10/18/2002
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Van Tongeren, Henricus Franciscus Johannus Jacobus, Liedenbaum, Coen theodorus Hubertus Fransiscus
• Application Number:
  US10/531,612
• Publication Number:
  US 20060044226A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

The invention relates to a full-colour organic electro-luminescent display device comprising RGBX-LEDs, wherein the fourth sub-pixel (X) has a higher efficiency than the efficiencies of the RGB sub-pixels. Said device provides a more power efficient generation of white light and other colours, a prolonged life time, and preferably also an extended colour range, in comparison to conventional RGB-LEDs.

Claims

1. A full-colour organic electro-luminescent display device comprising a plurality of independently addressable full-colour pixels, each full-colour pixel (RGBX) comprising four sub-pixels, a red (R), a green (G), a blue (B) and a fourth sub-pixel (X), characterised in that the fourth sub-pixel (X) emits light of a fourth non-white colour with an efficiency higher than the efficiency of each of the R (red), G (green), and B (blue) sub-pixel.

2. A full-colour organic electro-luminescent display device according to claim 1, wherein said non-white colour has colour coordinates outside the colour area defined by the colour coordinates corresponding to light emitted from the RGB sub-pixels.

3. A full-colour organic electro-luminescent display device according to claim 1, wherein the fourth sub-pixel comprises a polymeric electro-luminescent compound.

4. A full-colour organic electro-luminescent display device according to claim 3, wherein the polymeric electro-luminescent compound is a poly(phenylene-vinylene).

5. A full-colour organic electro-luminescent display device according to claim 1, wherein the non-white colour emitted from the fourth sub-pixel (X) is yellow/green light.

6. A full-colour organic electro-luminescent display device according to claim 1, wherein each full-colour pixel comprises a plurality of subsets of sub-pixels available for emitting light of a desired colour, and the device comprises driving means for selectively addressing the subset among the plurality of subsets which provides the desired colour with the highest efficiency.

7. A full-colour organic electro-luminescent display device according to claim 1, wherein each full-colour pixel comprises a plurality of subsets of sub-pixels available for emitting light of a desired colour, and the device comprises driving means for selectively addressing the subset among the plurality of subsets which provides the desired colour with the longest life time of the sub-pixels.