LIGHT-EMITTING MODULE, AND DISPLAY UNIT AND LIGHTING UNIT USING THE SAME

• US 20090140633A1
• Filed: 10/27/2006
• Published: 06/04/2009
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nagai, Hideo, Tanimoto, Noriyasu, Tooya, Yoshirou
• Granted Patent: US 7,745,985 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: F21S 6/00 Lighting devices intended to be free-standing F21S9/00, F21S10/00, F21S13/12 take precedence lighting devices specially adapted to be transported from place to place, e.g. lighting devices carried on wheeled supports F21L; details of supports for lighting devices F21V21/00
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/16225 the item being non-metallic, e.g. insulating substrate with or without metallisation
• CPC Class Codes: H01L 2224/32245 the item being metallic
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2224/48257 connecting the wire to a die pad of the item
• CPC Class Codes: H01L 2224/49107 on the semiconductor or solid-state body
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• CPC Class Codes: H01L 2224/8592 Applying permanent coating, e.g. protective coating
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2933/0041 relating to wavelength conversion elements
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/508 having a non-uniform spatial arrangement or non-uniform concentration, e.g. patterned wavelength conversion layer, wavelength conversion layer with a concentration gradient of the wavelength conversion material
• CPC Class Codes: H04N 9/315 Modulator illumination systems general applications of lighting devices F21V; general optical systems G02B; lamp houses for projectors not peculiar to the presence of an electronic spatial light modulator G03B21/20
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light-emitting module (1) includes a substrate (10), a plurality of light-emitting elements (14) formed on the substrate (10), and phosphor layers (15) covering each of the light-emitting elements (14). Each of the phosphor layers (15) includes a first phosphor region (15a) and a second phosphor region (15b) that are divided in the direction substantially parallel to the surface of the substrate (10). Each of the first phosphor region (15a) and the second phosphor region (15b) includes a phosphor that absorbs light emitted from the light-emitting element (14) and emits fluorescence. The maximum peak wavelength of fluorescence emitted from the first phosphor region (15a) is longer than that of fluorescence emitted from the second phosphor region (15b).

Claims

1. A light-emitting module comprising:

a substrate;

a plurality of light-emitting elements formed on the substrate; and

phosphor layers covering each of the light-emitting elements,

wherein each of the phosphor layers comprises a first phosphor region and a second phosphor region that are divided in a direction substantially parallel to a surface of the substrate,

each of the first phosphor region and the second phosphor region includes a phosphor that absorbs light emitted from the light-emitting element and emits fluorescence, and

a maximum peak wavelength of fluorescence emitted from the first phosphor region is longer than that of fluorescence emitted from the second phosphor region.

2. The light-emitting module according to claim 1, wherein the first phosphor regions and the second phosphor regions are arranged alternately in each row and in each column with respect to the surface of the substrate.

3. The light-emitting module according to claim 1, wherein the fluorescence emitted from the first phosphor region is red light having a maximum peak wavelength within a range of 590 to 650 nm, and

the fluorescence emitted from the second phosphor region is green light having a maximum peak wavelength within a range of 500 to 550 nm.

7. The light-emitting module according to claim 1, further comprising a plurality of sub-mount substrates mounted on the substrate,

wherein one light-emitting element is mounted on each of the sub-mount substrates.

8. A display unit comprising the light-emitting module according to claim 1 as a light source.

9. A lighting unit comprising the light-emitting module according to claim 1 as a light source.

4. A light-emitting module comprising:

a substrate;

a plurality of light-emitting elements formed on the substrate; and

phosphor layers covering each of the light-emitting elements,

wherein the light-emitting elements comprise first light-emitting elements and second light-emitting elements,

the phosphor layers comprise first phosphor layers covering the first light-emitting elements and second phosphor layers covering the second light-emitting elements,

each of the first phosphor layers includes a phosphor that absorbs light emitted from the first light-emitting element and emits fluorescence,

each of the second phosphor layers includes a phosphor that absorbs light emitted from the second light-emitting element and emits fluorescence, and

a maximum peak wavelength of fluorescence emitted from the first phosphor layer is longer than that of fluorescence emitted from the second phosphor layer.

5. The light-emitting module according to claim 4, wherein the first phosphor layers and the second phosphor layers are arranged alternately in each row and in each column with respect to the surface of the substrate.

6. The light-emitting module according to claim 4, wherein the fluorescence emitted from the first phosphor layer is red light having a maximum peak wavelength within a range of 590 to 650 nm, and

the fluorescence emitted from the second phosphor region is green light having a maximum peak wavelength within a range of 500 to 550 nm.

10. The light-emitting module according to claim 4, further comprising a plurality of sub-mount substrates mounted on the substrate,

wherein one light-emitting element is mounted on each of the sub-mount substrates.

11. A display unit comprising the light-emitting module according claim 4 as a light source.

12. A lighting unit comprising the light-emitting module according claim 4 as a light source.