A method of detecting the alignment error of lenses and reducing image
distortion attributable to the alignment error in a lens-type
3-dimensional liquid crystal display monitor. A method of detecting the
alignment error of lenses in a 3D display using a purpose-built test
pattern image, which predicts the alignment error in such a way as to
calculate variation in view indices of pixels in a lateral direction,
observed by an eye of an observer, if there is alignment error in the
lenses. A method of compensating for image distortion in a 3D monitor,
including the steps of finding the relationship between the pixels of a
Liquid Crystal Display (LDC) panel and the pixels of observed images,
which are determined depending on the location of an observer; and
compensating for image distortion attributable to the rotational and
translational alignment error of the lenses based on the found
relationship.