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For passive matrix display, STN with 220° 〜 240° twist angle has been considered for achieving high duty ratio.
Meanwhile, for active matrix display, a large cell gap tolerance to accomodate the bumpy reflector surfaces is brought by MTN cells, so that, a good contrast ratio can still be obtained.
Furthermore, for reflection type projection display, MTN and homotropic cells are favored choices due to their high contrast ratio.
