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§ 7.1 Two-polarizer R-LCDs
Wristwatch displays use two polarizers. A LC cell is sandwiched between two crossed linear polarizers. The 90° twisted nematic ( TN ) cell is used as light switch.
Behind the second polarizer, a diffusive reflector reflects the incident light back to the viewer.
The 90° TN cell has been widely used for transmissive display due to its high efficiency, weak color dispersion, high contrast ratio and low operation voltage.
