| 摘要 |
A field emission device ( 100 ) is provided for reducing power and audible noise during discharging of dielectric surfaces ( 137, 138 ). The field emission device ( 100 ) comprises an anode ( 122 ) and a first substrate ( 111 ) including a cathode plate ( 110 ) comprising a plurality of active display devices ( 114 ) and dielectric surfaces ( 137, 138 ). The plurality of active display devices ( 114 ) emit electrons ( 132 ) to strike the anode during a scanning mode, and emit electrons ( 135 ) to strike the dielectric surfaces ( 137, 138 ) during a discharge mode. At least one of a plurality of spacers ( 136 ) positioned between the anode ( 122 ) and the cathode plate ( 110 ) comprise a first sense electrode ( 142 ) positioned proximate to the anode ( 122 ), and a second sense electrode ( 144 ) positioned proximate to the cathode plate ( 110 ) and spaced apart from the first sense electrode ( 142 ). A circuit ( 222, 224, 226 ) for sensing a difference in charge between the first and second sense electrodes ( 142, 144 ) is coupled to the anode ( 122 ) and cathode plate ( 110 ) for alternately initiating the scanning mode and the discharge mode in response to the difference in charge reaching a threshold.
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