A redundant sense amplifier is provided together with a corresponding bit line, which is connected to all word lines in the memory array. The cables may be slantways or vertically installed from superiority to inferiority. The phosphor layer includes a first phosphor layer emitting first color light, a second phosphor layer emitting second color light, and a third phosphor layer emitting third color light. The pressure cylinders may be expanded by pressure from the Inside of the tubular section. The differentiator is mounted under the support surface.