White light tandem OLED display with filters

• US 20070001587A1
• Filed: 06/29/2005
• Published: 01/04/2007
• Est. Priority Date: 06/29/2005
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Spindler, Jeffrey, Hatwar, Tukaram, Boroson, Michael
• Granted Patent: US 7,531,959 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: H10K 50/12 comprising dopants
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 85/322 comprising boron
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/623 containing five rings, e.g. pentacene
• CPC Class Codes: H10K 85/624 containing six or more rings
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/652 Cyanine dyes
• CPC Class Codes: H10K 85/654 comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/656 comprising two or more different heteroatoms per ring H10K85/652 takes precedence
• CPC Class Codes: H10K 85/657 Polycyclic condensed heteroaromatic hydrocarbons

Abstract

A tandem OLED device having spaced electrodes includes broadband light-emitting units disposed between the electrodes that produce different emission spectra and each light-emitting unit produces light that has multiple spaced peak spectral components, and an intermediate connector disposed between each of the light-emitting units. The device also includes an array of at least three different color filters associated with the device which receives light from the broadband light-emitting units, the band pass of each of the color filters being selected to produce different colored light, wherein the full width at about half maximum of at least one of such spaced peak spectral components produced by each emitting unit is within the band pass of a color filter, and wherein each of the at least three different color filters receives at least one spaced peak spectral component having a full width at about half maximum that is within its band pass.

Claims

1. A tandem OLED device having at least two spaced electrodes comprising:

a) at least two broadband light-emitting units disposed between the electrodes that produce different emission spectra and each light-emitting unit produces light that has two or more spaced peak spectral components;

b) an intermediate connector disposed between each of the light-emitting units; and

c) an array of at least three different color filters associated with the device that receives light from the broadband light-emitting units, the band pass of each of the color filters being selected to produce different colored light,

wherein the full width at about half maximum of at least one of such spaced peak spectral components produced by each emitting unit is within the band pass of a color filter, and wherein each of the at least three different color filters receives at least one spaced peak spectral component having a full width at about half maximum that is within its band pass.

2. The tandem OLED device of claim 1 wherein the device is a full color display having an array of individually addressable pixels associated with the array of color filters.

3. The tandem OLED device of claim 2 wherein the color filters are red, green, and blue.

4. The tandem OLED device of claim 3 further including one or more individually addressable pixels that is substantially not filtered.

5. The tandem OLED device of claim 4 wherein the individually addressable pixels each emit red, green, blue, or white light.

6. The tandem OLED device of claim 1 wherein a first broadband light-emitting unit produces two spaced peak spectral components and a second broadband light-emitting unit produces two spaced peak spectral components such that at least one of the spaced spectral components of the second broadband light-emitting unit is different than that of the first.

7. The tandem OLED device of claim 6 wherein a first broadband light-emitting unit produces blue and red spaced peak spectral components and a second broadband light-emitting unit produces blue and green spaced peak spectral components.

8. The tandem OLED device of claim 7 wherein the second broadband light-emitting unit further produces one or more red spaced peak spectral component(s).

9. The tandem OLED device of claim 1 wherein the relative radiance intensities of such spaced peak spectral components received by each color filter are within a factor of 4 of each other.

10. The tandem OLED device of claim 1 wherein at least one peak spectral component is between 600 and 640 nm and has a full width at half maximum of 40 nm or less.

11. The tandem OLED device of claim 1 wherein at least one peak spectral component is between 510 and 540 nm and has a full width at half maximum of 40 nm or less.

12. The tandem OLED device of claim 1 wherein at least one peak spectral component is between 450 and 480 nm and has a full width at half maximum of 20 nm or less.

13. The tandem OLED device of claim 1 having three broadband light-emitting units.

14. A white light-emitting OLED comprising:

a) an anode and a cathode; and

b) at least four light-emitting materials provided between the anode and the cathode, wherein each of the four light-emitting materials produces a different emission spectrum when current passes between the anode and cathode, such spectra combine to form white light.

15. An OLED display comprising:

a) an array of first, second, third and fourth light-emitting pixels, each pixel having an anode, a cathode, and a white light-emitting element provided between each anode and cathode, such white light-emitting element including first, second, third, and fourth light-emitting materials each having different, spaced emission peak spectral components that combine to form white light when current passes through the anode and cathode; and

b) an array of at least three different color filters in operative association with the first, second, and third light-emitting pixels, such filters being selected to receive white light to produce different colored light,

wherein each of the at least three different color filters receives at least one spaced emission peak spectral component having a full width at about half maximum that is within the band pass of the respective color filter,

and wherein the fourth light-emitting pixel produces white light.