A flat-panel device comprising:
a main compartment formed with a first plate structure, a second plate structure, and a generally annular outer wall that extends between the plate structures; an auxiliary compartment situated outside the main compartment, the auxiliary compartment formed with an auxiliary wall that contacts the first plate structure outside the main compartment, extends away from the first plate structure and main compartment, bends back towards the second plate structure, and contacts the second, plate structure outside the main compartment, the auxiliary compartment connected pressure-wise to the main compartment so that the two compartments reach largely equal steady-state compartment pressures; a getter situated in the auxiliary compartment; and control circuitry situated over the first plate structure outside the compartments, the auxiliary wall not extending significantly further away from the first plate structure than the control circuitry.