Active landing control system for raster based devices
AssigneesSony Corporation, Sony Electronics Inc.
InventorsPeter Rae Shintani, Ban Kawamura, Eiji Kono
Life of this patent
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Abstract
Correction of electron beam landing misalignment in a raster-type display is undertaken without using the usual set of coils, but rather by superimposing a landing misalignment correction signal on the already-existing velocity modulation (VM) coil or on another coil located at the junction of the electron beams in the neck of the display. The correction signal may be varied based on pressure, temperature, and ambient magnetic field as indicated by respective sensors to appropriately correct electron beam landing on phosphors the positions of which may be affected by variations in magnetic fields, temperature, and pressure.
Claims21
A raster-type display, comprising:
- a landing correction coil;
- a current source coupled to the landing correction coil and outputting a landing misalignment correction signal thereto;
- and
- a least one sensor generating a control signal, the control signal being sent to the current source to establish the landing misalignment correction signal at least partially based thereon, wherein the sensor is at least one of:
- a temperature sensor, and a magnetic sensor, and the landing misalignment correction signal is a ramp signal.
A method for correcting for electron beam landing misalignment in a raster-type display, comprising:
- applying an alignment correction signal to a coil located at a convergence of three beams of the display, the alignment correction signal being established to correct for landing offset of the beams caused by pressure effects, wherein the alignment correction signal being a sinusoid.
A raster display, comprising:
- single coil means for influencing at least scanning one electron beam for undertaking landing misalignment correction of the beam;
- a current source means coupled to the single coil means for outputting a landing misalignment correction signal thereto;
- and
- at least one sensing means for generating a control signal, the control signal being sent to the current source means to establish the landing misalignment correction signal at least partially based thereon, the signal being representative of at least one of:
- temperature, ambient magnetic field, in which case the correction signal is a ramp signal, or pressure, in which case the correction signal is a sinusoid.
Dependencies are inferred from the claim text.