Horizontal and vertical dynamic correction in CRT monitors
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorsEric Yves Serge Cirot, Sze Kwang Tan
Life of this patent
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Abstract
A device and method for generation of a dynamic focus correction signal for use with a CRT that includes an analog scanning processor for generating a dynamic focus correction signal that is proportional to Kx2+(1−K)x4, where x is the distance from a mid point of a viewing surface of the CRT, and K is a real number in the range 0.00 to 1.00. Embodiments of the invention find particular use in CRTs having generally flatter, squarer configurations.
Claims25
A device for generation of a correction signal for use with a CRT, comprising:
- an analog scanning processor configured to generate a correction signal that is proportional to Kx2+(1−K)x4, where x is the distance from a mid point of a viewing surface of the CRT, and K is a real number in the range 0.00 to 1.00.
A CRT monitor having an electron gun, comprising:
- an analog scanning processor for generation of a dynamic correction signal for use with the CRT monitor, the dynamic focus correction signal generated to be proportional to Kx2+(1−K)x4, where x is the distance from a mid point of a viewing surface of the CRT monitor and the electron gun, and K is a real number in the range 0.00 to 1.00.
A method of dynamic correction in a CRT monitor having an electron gun, the method comprising:
- generating an output from the electron gun;
- and
- generating a correction signal for the output of the electron gun that is proportional to Kx2+(1−K)x4, where x is the distance from a mid point of a viewing surface of the CRT monitor and the electron gun, and K is a real number in the range 0.00 to 1.00.
Dependencies are inferred from the claim text.