Cathode ray tube, scanning control device, and scanning method

A cathode ray tube wherein

• a single screen is split into a plurality of screen regions, and the plurality of screen regions overlap one another on a phosphor screen to combine together, and field scanning or frame scanning is carried out on adjacent screen regions in the same direction as each other, so that an image is displayed,
• the cathode ray tube comprising:
• a plurality of electron guns emitting a plurality of electron beams for scanning the plurality of screen regions based on a plurality of image signals applied;
• a memory means storing a plurality of frames of image data for one of two adjacent screen regions;
• and
• a generation means carrying out image interpolation processing based on the image data stored in the memory means so as to apply an image signal in a state that the content of a image is temporally shifted between two adjacent screen regions to the electron guns, and thereby generating a new image signal delayed behind an image signal for the other screen region only by a predetermined period and outputting the generated image signal as the image signal for the one of the screen regions.

A scanning control device controlling scanning of an electron beam in a cathode ray tube, wherein

• the cathode ray tube comprises:
• a plurality of electron guns emitting a plurality of electron beams to a phosphor screen,
• wherein a single screen is split into a plurality of screen regions, and the plurality of screen regions overlap one another on the phosphor screen to combine together, and field scanning or frame scanning is carried out on adjacent screen regions in a direction opposite to each other, so that an image is displayed,
• the scanning control device comprises:
• a frame synchronizer generating a relative difference in scanning time of the plurality of electron beams scanning the plurality of screen regions so that the sum of beam currents applied to a phosphor in the same pixel position per unit time does not exceed a limit of intensity saturation of the phosphor in a region where the plurality of screen regions overlap one another.

A scanning control device controlling scanning of an image in a cathode ray tube, wherein

• the cathode ray tube comprises:
• a plurality of electron guns emitting a plurality of electron beams based on a plurality of image signals applied,
• wherein a single screen is split into a plurality of screen regions, and the plurality of screen regions overlap one another on a phosphor screen to combine together, and field scanning or frame scanning is carried out on adjacent screen regions in the same direction as each other, so that an image is displayed,
• the scanning control device comprises:
• a memory means storing a plurality of frames of image data for one of two adjacent screen regions;
• and
• a generation means carrying out image interpolation processing based on the image data stored in the memory means so as to apply an image signal in a state that the content of a image is temporally shifted between the two adjacent screen regions to the electron guns, and thereby generating a new image signal delayed behind an image signal for the other screen region only by a predetermined period and outputting the generated image signal as the image signal for the one of the screen regions.

A scanning method for controlling scanning of an electron beam in a cathode ray tube, wherein

• the cathode ray tube comprises:
• a plurality of electron guns emitting a plurality of electron beams to a phosphor screen,
• wherein a single screen is split into a plurality of screen regions, and the plurality of screen regions overlap one another on the phosphor screen to combine together, and field scanning or frame scanning is carried out on adjacent screen regions in a direction opposite to each other, so that an image is displayed,
• the scanning method comprises the step of:
• generating a relative difference in scanning time of the plurality of electron beams scanning the plurality of screen regions so that the sum of beam currents applied to a phosphor in the same pixel position per unit time does not exceed a limit of intensity saturation of the phosphor in a region where the plurality of screen regions overlap one another to carry out screen scanning.

A scanning method for controlling scanning of an image in a cathode ray tube, wherein

• the cathode ray tube comprises:
• a plurality of electron guns emitting a plurality of electron beams based on a plurality of image signals applied,
• wherein a single screen is split into a plurality of screen regions, and the plurality of screen regions overlap one another on a phosphor screen to combine together, and field scanning or frame scanning is carried out on adjacent screen regions in the same direction as each other, so that an image is displayed,
• the scanning method comprises the steps of:
• storing a plurality of frames of image data for one of two adjacent screen regions;
• carrying out image interpolation processing based on the stored image data, and thereby generating a new image signal delayed behind an image signal for the other screen region only by a predetermined period and outputting the generated image signal as the image signal for the one of the screen regions;
• and
• applying an image signal in a state that the content of an image is temporally shifted between the two adjacent screen regions to the electron guns.