Surface light source device having secondary electron emission layer, method of manufacturing the same, and backlight unit having the same

摘要

There is provided a substrate for a surface light source device, comprising a first secondary electron emission layer including crystalline magnesium oxide (MgO) powder on a surface of the substrate. There is also provided a surface light source device comprising a first substrate and a second substrate facing each other at a predetermined distance between which a discharge space is formed; and an electrode to apply a discharge voltage to the discharge space, wherein a first secondary electron emission layer including crystalline MgO powder is formed on a surface of at least one of the first substrate and the second substrate. Preferably, the crystalline MgO powder is obtained by grinding an MgO sputtering target. There is provided a backlight unit comprising a surface light source device including a discharge space formed between a first substrate and a second substrate, an electrode to apply a discharge voltage to the discharge space, and a first secondary electron emission layer including crystalline MgO powder on a surface of at least one of the first substrate and the second substrate; a case to receive the surface light source device; and an inverter to supply a discharge voltage to the electrode. Preferably, a second secondary electron emission layer ion-exchanged with a secondary electron emitting material is formed under a surface of the substrate.