The LCD screen itself should not be easily effected by magnetic
fields, unless they are extremely strong. If a strong magnetic field
approaches any electronic circuits, especialy ones that use some
reactive devices, and high frequency operations, there can be some
effect.
As for general exposure to the types of magnetic fields that you would
have from speaker, and other appliances, the LCD is not as effected as
a CRT. You will not have purity, or convergence problems with an LCD
screen. There is no electron beam to be effected, as in the internal
function of a picture tube.
As for the DLP screens for home use, they use a motor with a wheel,
and a micro-mirror display IC for the picture. There are some very
complex electronics used to drive this display and control the
sequence of the filter motor. If there is a strong magnetic field
near by, it may cause some effect on the performance of the unit. If a
magnetic field is close to the screen itself, there should be no
effect at all, because this would be a projected image using light
only. It would take much more of a magnitic field than anyone can
have at home or in a general lab to bend light.
All electronics is effected by magnetic fields in some way. The degree
of the effect is dependend on many complex factors, and the type of
operation the electronics are performing.
Jerry Greenberg
http://www.zoom-one.com
