Active matrix addressed polymer LED display

• US 20060007076A1
• Filed: 09/07/2005
• Published: 01/12/2006
• Est. Priority Date: 06/16/1998
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Sheats, James R., Moon, Ronald L., Hueschen, Mark R.
• Application Number:
  US11/222,205
• Publication Number:
  US 20060007076A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 59/127 comprising two substrates, e.g. display comprising OLED array and TFT driving circuitry on different substrates
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

A display having a plurality of light emitting pixels. Each pixels includes an isolation transistor, a driving circuit, and an organic light emitting diode (OLED). The driving circuit storing a value that determines the magnitude of the light emitted by that pixels, the driving circuit placing the OLED in a conducting path between the first and second power terminals. The driving circuit is programmed through the isolation transistor. In one embodiment of the present invention, the driving circuit includes a storage capacitor and a driving transistor. The OLEDs are part of an array of OLEDs. The array of OLEDs is constructed on a flexible sheet having first and second surfaces, the flexible sheet being transparent to light of a first wavelength. A transparent first electrode layer is in contact with the first surface. A light emitting layer including an organic polymer is in contact with the first electrode layer. A plurality of second electrodes, one such second electrode corresponding to each of the OLEDs, is in contact with the light emitting layer. Each second electrode has an isolated conducting area. The driving transistor are part of a transistor array having a plurality of connection points disposed on a surface, each connection point corresponding to one of the second electrodes in the array of OLEDs. The connection points are arranged such that each second electrode overlies the corresponding connection point when the array of OLEDs is properly aligned with the transistor array. The connection points are bonded to the corresponding second electrodes by a bonding layer.

Claims

1-2. -2. (canceled)

3. A display comprising a plurality of light emitting pixels, each pixel comprising an isolation transistor, a driving circuit, and an organic light emitting diode (OLED), said driving circuit storing a value that determines the magnitude of the light emitted by that pixel, said driving circuit placing said OLED in a conducting path between first and second power terminals, said isolation transistor connecting said driving circuit to a bit line when said isolation transistor is placed in a conducting state by the application of a logic signal to a word line, wherein said OLEDs are part of a flexible array of OLEDs, said array of OLEDs comprising:

a flexible sheet having first and second surfaces, said first and second surfaces being parallel to one another, said flexible sheet being transparent to light of a first wavelength;

a first electrode comprising a first electrode layer in contact with said first surface, said first electrode layer being transparent to light of said first wavelength;

a light emitting layer comprising an organic polymer in electrical contact with said first electrode layer; and

a plurality of second electrodes, one such second electrode corresponding to each OLEDS, each of said second electrodes comprising an isolated conducting area in electrical contact with said light emitting layer, said light emitting layer generating light of said first wavelength in a region adjacent to said second electrode when a potential difference is applied across said first and second electrodes, and wherein said isolation transistors are located on a substrate that is separate from said flexible array of OLEDs, said substrate being bonded to said flexible array of OLEDs by an adhesive layer.

4-12. -12. (canceled)

13. A method for fabricating a display having a plurality of pixels, said method comprising:

fabricating an array of OLEDs on a flexible first substrate;

fabricating an array of isolation transistors, and driving circuits on a second substrate, each driving circuit storing a value that determines the magnitude of the light emitted by a corresponding one of said pixels in said display, said driving circuit placing said OLED in a conducting path between first and second power terminals, said isolation transistor connecting said driving circuit to a bit line when said isolation transistor is placed in a conducting state by the application of a logic signal to a word line; and

bonding said first and second substrates together.

14. The method of claim 13 wherein said first and second substrates are bonded together by a layer of adhesive.

15. The method of claim 14 wherein said adhesive is an anisotropic conductive adhesive.