Granted Patent B2

US 6,841,949 · App. 10/666,145 · Granted Jan 11, 2005

Abstract

Claims (30)

1. A method of making a light emitting device, comprising:

forming an array of OLEDsincluding a first and a second set;

electrically connecting the first set of OLEDs which emit light of a first color to a power source;

electrically connecting the second set of OLEDs which emit light of a different second color to the same power source; and

forming a layer of scattering medium over the array of OLEDs;

the method further comprising mounting the array of individual OLEDs on a common substrate;

wherein the step of forming the array of OLEDs comprising forming each OLED and forming the array of OLEDs, and

wherein the step of forming each OLED comprises:

forming a transparent electrode over a first substrate;

forming a polymer or molecular organic light emitting layer over the transparent electrode;

forming a metal electrode over the organic light emitting layer;

forming a sealing member above the metal electrode;

removing a portion of the organic light emitting layer above the transparent electrode to expose a first portion of a top surface of the transparent electrode;

forming a first metal device contact over the sealing member, which contacts the first portion of the top surface of the transparent electrode;

forming a second metal device contact over the sealing member, which contacts a top surface of the metal electrode; and

wherein the step of forming the array comprises:

forming an adhesive layer over the mounting substrate;

attaching each OLED over the adhesive layer;

forming electrical contacts through the mounting substrate and the adhesive layer which contact the first and second device contacts; and

forming the layer of scattering medium over the first substrate.

2. The method of claim 1 , wherein:

the first set of OLEDs which emit light of a first color comprises a set of red emitting OLEDs;

the second set of OLEDs which emit light of a second color comprises a set of green emitting OLEDs; and

further comprising electrically connecting a third set of OLEDs which emit blue light to the same power source.

3. The method of claim 1 , wherein:

the first set of OLEDs which emit light of a first color comprises a set of red, green and blue light emitting OLEDs whose output appears as white light of a first color;

the second set of OLEDs which emit light of a first color comprises a set of red, green and blue light emitting OLEDs whose output appears as white light of a different second color.

4. The method of claim 1 , wherein:

the first set of OLEDs which emit light of a first color comprises a set of blue light emitting OLEDs and a first phosphor whose combined output appears as white light having a first color temperature; and

the second set of OLEDs which emit light of a second color comprises a set of blue light emitting OLEDs and a second phosphor whose combined output appears as white light having second color temperature different from the first color temperature.

Assignments (10)