| abstract |
A reflection layer made of white pigment powder emits impurities such as moisture (H 2 O) and carbon dioxide (CO 2 ) adsorbed on the surface by discharge. And the emitted impure gas is adsorbed by the protective film or the like, and there is a problem that the discharge characteristics are lowered, that is, the discharge start voltage is raised. When the BET specific surface area is less than a certain value, it is considered that the packing density of the white pigment powder is small and the amount of impure gas adsorbed is also small. Therefore, when the reflective layer is composed of white pigment powder having a BET specific surface area of 6 m 2 / g or less, generation of impure gas is suppressed and the discharge start voltage does not increase. [Selection] Figure 3 |