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 terrible color dynamics and contrast (typically 15:1). They are also incredibly slow: On passive laptop computers, the cursor (or anything else) moving on the screen, goes invisible until you stop moving it (submarining) Only one or two projectors use any type of passive matrix display.
The original LCDs, these are controlled by a single processing system, for the whole screen, unlike active and poly-silicate panels, which have discrete circuits for each "pixel". This results in a panel with less color dynamics and lower contrast ratio. A major drawback of passive matrix LCD is they are very slow. With a passive LCD laptop computer, any moving screen object, such as the cursor, may disappear until you stop moving it. Very few projectors still use a passive matrix display.