Surface light source device

Abstract

There is provided a surface light source device containing 50 ppm or less of water, 50 ppm or less of nitrogen, 30 ppm or less of oxygen, 20 ppm or less of carbon monoxide, and 20 ppm or less of carbon dioxide as impurities in its discharge space. Accordingly, the surface light source device with the impurity standards has improved brightness.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

FIG. 1 is a perspective view illustrating an independent partition type surface light source device; and

FIG. 2 is a perspective view illustrating an integrated partition type surface light source device.

Claims

1. A surface light source device containing 50 ppm or less of water as an impurity in its discharge space.

2. The surface light source device of claim 1, wherein 50 ppm or less of nitrogen is contained as an impurity in the discharge space.

3. The surface light source device of claim 1, wherein 30 ppm or less of oxygen is contained as an impurity in the discharge space.

4. The surface light source device of claim 1, wherein 20 ppm or less of carbon monoxide is contained as an impurity in the discharge space.

5. The surface light source device of claim 1, wherein 20 ppm or less of carbon dioxide is contained as an impurity in the discharge space.

6. The surface light source device containing 50 ppm or less of water, 50 ppm or less of nitrogen, 30 ppm or less of oxygen, 20 ppm or less of carbon monoxide, and 20 ppm or less of carbon dioxide as impurities in its discharge space.