Illumination device and display with illumination device

• US 7,736,017 B2
• Filed: 12/14/2007
• Issued: 06/15/2010
• Est. Priority Date: 12/21/2006
• Status: Active Grant

• Current Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Original Assignee: Osram Opto Semiconductors GmbH (Ams-Osram AG)
• Inventors: Michel, Felix, Nguyen, Francis, Huang, Michelle Kun, Muschaweck, Julius
• Primary Examiner(s): Ward; John A
• Application Number:
  US11/956,646
• Publication Number:
  US 20080192465A1
• Time in Patent Office: 914 Days
• Field of Search: 362/231, 362/612, 362/613
• US Class Current: 362/231
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 6/0046 Tapered light guide, e.g. wedge-shaped light guide
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02F 1/133603 with LEDs

Abstract

According to at least one embodiment of the invention an illumination device emitting light with an average color comprises a plurality of first light-emitting diodes (LEDs) emitting light with a first color and a plurality of second light-emitting diodes (LEDs) emitting light with a second color, wherein the average color is a superposition of the first and the second color.

Claims

1. An illumination device emitting light with an average color, comprising

a plurality of first light-emitting diodes (LEDs) emitting light with a first color and a plurality of second light-emitting diodes (LEDs) emitting light with a second color, wherein the average color is a superposition of the first and the second color,

the first color providing a bluish-white color impression and the second color providing a yellowish-white color impression

wherein each of the plurality of first LEDs is characterized by a respective first point in the color space, each respective first point in the color space located on a first side with respect to an average color point,

each of the plurality of second LEDs is characterized by a respective second point in the color space, each respective second point in the color space located on a second side with respect to the average color point,

the second side is opposite the first side with respect to the average color point,

the plurality of the first LEDs has an average first color,

the plurality of the second LEDs has an average second color, and

the average first color and the average second color, when mixed, are close to or equal to the average color of the illumination device.

2. The illumination device according to claim 1, wherein the first LEDs and the second LEDs are arranged in an alternating pattern.

3. The illumination device according to claim 2, wherein the alternating pattern is a line shaped pattern or a chessboard-like pattern.

4. The illumination device according to claim 1, wherein the first color comprises a blue wavelength with a higher relative intensity than the average color and the second color comprises a yellow wavelength with a higher relative intensity than the average color.

5. A display, comprising

an illumination device according to claim 1, and

an LCD matrix in the light path of the illumination device.