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Instead the ‘interference mode’ is used where one has to accept a highly coloured off-state.
According to some experiments, they show periodic zeros for the different colours as before but not the general decaying envelope.
Therefore, the transmission for ‘wrong’ colours is much higher than in the waveguide mode.
The resulting colour is chosen in a way that the subjective contrast is still acceptable ー usually yellow or blue.
Therefore, in the context of super-twisted nematic displays one speaks about normally-yellow and normally-blue displays.
