Picture image display apparatus

A picture image display apparatus comprising:

• a flat type vacuum enclosure having a transparent face panel,
• a row of parallelly disposed linear thermionic cathodes,
• electron beam forming electrode which produces a predetermined number of two dimensionally disposed electron beams out of the electron emission from said linear thermionic cathodes,
• a row of control electrodes disposed parallelly in a direction perpendicular to those of said linear thermionic cathodes,
• a row of vertical deflection electrodes,
• a row of horizontal deflection electrodes,
• a phosphor screen formed on the inner face of said face panel,
• an anode of thin metal film formed on said surface of said phosphor screen,
• a horizontal deflection signal generator which issues horizontal deflection signal to be applied to said horizontal deflection electrodes,
• a vertical deflection signal generator which issues vertical deflection signal to said vertical deflection electrodes, and
• circuits for producing control signals to be applied to said control electrodes, said circuits comprising a memory for storing video signal and a multiplexer for converting said stored video signal into parallel signals for said control electrodes,
• wherein the improvement is that
• said horizontal deflection signal generator issues a horizontal deflection signal having two scanning periods of substantially the same length during 1 cycle and comprising a first scanning period wherein voltage increases and a second scanning period wherein voltage decreases, in both of said first scanning period and second scanning period said control signals being applied to said control electrodes to produce image spots in both scanning periods.

A picture image display apparatus comprising:

• a flat type vacuum enclosure having a transparent face panel,
• a row of parallelly disposed linear thermionic cathodes,
• an electron beam extractor electrode which produces a predetermined number of two dimensionally disposed electron beams out of the electron emission from said linear thermionic cathodes,
• a row of control electrodes disposed parallelly in a direction perpendicular to those of said linear thermionic cathodes,
• a row of vertical deflection electrodes,
• a row of horizontal deflection electrodes,
• a phosphor screen formed on the inner face of said face panel,
• an anode of thin metal film formed on said surface of said phosphor screen,
• a horizontal deflection signal generator which issues horizontal deflection signal for said horizontal deflection electrodes,
• a vertical deflection signal generator which issues a vertical deflection signal for said vertical deflection electrodes, and
• circuits for producing control signals to be applied to said control electrodes, said circuits comprising a memory for storing a video signal and a multiplexer for converting said stored video signal into parallel signals for said control electrodes,
• wherein the improvement is that
• said row of horizontal deflection electrodes comprises a plural number of first electrodes and a plural number of second electrodes alternatingly and parallelly disposed in a manner that gaps are formed inbetween, and one row of said electron beams are formed to pass through corresponding one gap, said first electrodes being electrically connected with each other and said second electrodes being electrically connected with each other and said horizontal deflection signal being impressed across the first electrodes and the second electrodes,
• said horizontal deflection signal generator issues a horizontal deflection signal having two scanning periods of substantially the same length during 1 cycle and comprising a first scanning period wherein voltage increases and a second scanning period wherein voltage decreases, in both of said first scanning period and second scanning period said control signals being applied to said control electrodes to produce image spots in both scanning periods, and
• said control electrodes are impressed with control signals in a manner that alternate control electrodes receive a control signal formed by converting the video signal into parallel signals, and
• the other alternate control electrodes receive a control signal formed by converting the video signal into parallel signals of reversed time sequence.