The original LCDs, these are controlled by a single processing system for the whole screen, unlike active and poly-si, which have discrete circuits for each pixel. This results in a panel with inferior colour dynamics and contrast (typically 15:1). They are also slow to react to changing signals. On passive laptop computers, the cursor (or anything else) moving on the screen, becomes invisible until you stop moving it (submarining). Very few projectors use any type of passive matrix display.
Unlike active and poly-si (which have discrete circuits for each ?pixel?), a single processing system controls the whole screen on these original LCD?s. Due to this, the panel has very poor contrast and colour dynamics, and can be incredibly slow. There are only a few projectors that use a passive matrix display. On passive laptop computers, anything moving on the screen goes invisible until you stop moving it (submarining).