Fields in fpm should be grayed which display type is Input Field

Hi,

As per my requirement i want to make 5 fields to be grayed i.e in display mode.In that i write code in feeder class but in that 5 fields four are of Input fields

and one is text view.The field which is of type text view is working fine but The input field type i can't make grayed?

How to make them grayed. What i need to do make a field of type "Input Field" in display mode(Grayed)????