Patent ID: 6876344

Claim:
A flat thermionic emission screen ( 1 ) comprising: a first substrate ( 2 ) on which are arranged an emission cathode ( 4 ) and an electron extraction grid ( 8 ), a second substrate ( 12 ) facing the first substrate ( 2 ), on which is arranged an anode ( 14 ) designed to collect the electrons emitted by the cathode( 4 ), and an electronic control circuit ( 19 ) of the anode voltage ( 14 ) comprising at least one commutation component ( 18 , 20 ), wherein the commutation component ( 18 , 20 ) is an HV transistor with a first electrode ( 40 , 50 ) integrated in the first substrate ( 2 ), a second electrode ( 42 , 52 ) integrated in the second substrate ( 12 ) and a third electrode ( 44 , 54 ) integrated in the extraction grid ( 8 ).