Illumination device and manufacturing method thereof

Abstract

Illumination device has a plurality of light emitting units, each with light emitting element and first fluorescent material region provided at a light emitting side of the light emitting element. A plurality of second fluorescent material regions are provided at the light emitting sides of respective light emitting units. Second fluorescent material regions having the same emission conversion property are respectively provided at the light emitting side of at least one light emitting unit having the same emission property among the plurality of light emitting units.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a top plan view of a representative illumination device according to one embodiment.

FIG. 2 is a cross sectional view taken along line II-II of FIG. 1.

FIG. 3 is an explanatory view showing a frame format of grouping of light emitting units that comprise an illumination device according to one embodiment.

Claims

1. An illumination device comprising: a plurality of light emitting units, each of the light emitting units having a light emitting element and a first fluorescent material region containing a fluorescent material and provided at the light emitting side of the light emitting element; anda plurality of second fluorescent material regions containing fluorescent material at a light emitting side of the respective light emitting units,wherein the second fluorescent material regions having the same emission conversion property are respectively provided at the light emitting side of at least one light emitting unit having the same emission property among the plurality of light emitting units.

2. The illumination device of claim 1, wherein the emission conversion property is color conversion.

3. The illumination device of claim 1, wherein the plurality of light emitting units are divided into a plurality of groups based on emission properties, and the second fluorescent materials having an emission conversion property that corresponds to each of the plurality of groups are provided at the light emitting sides of light emitting units for each corresponding group.

4. The illumination device of claim 1, wherein the plurality of light emitting units are sub-grouped according to differences of emission property from a desired emission property, and the second fluorescent materials have emission conversion properties that correspond to each of the sub-groups and are provided at light emitting sides of the light emitting units that belong to the corresponding group.

5. The illumination device of claim 1, wherein the second fluorescent material regions are formed as a unit that can be handled in advance of a subsequent manufacturing step.

6. The illumination device of claim 1, wherein the second fluorescent material regions are formed in the shape of a sheet.

7. A method for manufacturing an illumination device, comprising: forming a plurality of light emitting units, each of the light emitting units having a light emitting element and a first fluorescent material region containing a fluorescent material and provided at the light emitting side of the light emitting element;determining an emission property of the light emitting units and dividing the light emitting units into a plurality of groups, each of the plurality of groups containing at least one light emitting unit having the same emission property; andproviding a plurality of second fluorescent material regions containing a fluorescent material such that the second fluorescent material regions having the same emission conversion property are respectively provided at the light emitting side of the light emitting units that have been grouped in the same group.

8. The method of claim 7, wherein the emission conversion property is color conversion.

9. The method of claim 7, further comprising forming the second fluorescent material regions as a unit that can be handled in advance of a subsequent manufacturing step.

10. The method of claim 9, wherein the second fluorescent material regions that are formed as a unit are formed in the shape of a sheet.