trapezium distortion

trapezium distortion

[trə′pē·zē·əm di‚stȯr·shən]
(electronics)
A defect in a cathode-ray tube in which the trace is confined within a trapezium rather than a rectangle, usually as a result of interaction between the two pairs of deflection plates.
References in periodicals archive ?
Auto Keystone Correction is also included on all models, to automatically compensate for the trapezium distortion which occurs when the projector is set at an angle.