Glossary
is reflected. Contrast is therefore reduced in conditions of high ambient light levels. Black Matrix tubes
reflect less ambient light so exhibit higher contrast than other tubes.
Convergence error
Bean misalignment causing one or more of the three beams passing through the wrong aperture in the
shadow mask and striking a phosphor dot in the wrong triad.
Convergence error is expressed in mm often at three well-defined points on the screen, designated A, B
and C (see figure ). Also known as misconvergence.
Points where convergence error is specified.
Convergence-error correction
A method of correcting for convergence error to insure that all three beams land simultaneously in the same
triad. This is usually accomplished by means of special convergence-error correction coils in the deflection
yoke.
CRT
Cathode-ray tube - the general term for all tubes in which one or more electron beams emitted by a cathode
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