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Equivalent retarder-rotator approach to on-state twisted nematic liquid crystal displays
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View: Figures


Image of FIG. 1.
FIG. 1.

Action of the TNLCD over an input circularly polarized light on the Poincaré sphere. and represent, respectively, right-handed and left-handed circularly polarized states. The angles and are the spherical coordinates (longitude and latitude) of the output polarization state.

Image of FIG. 2.
FIG. 2.

Experimental setup for equivalent parameter measurement. is the polarizer; , the quarter-wave plate used to generate circularly polarized light; LCD, the sample display; , the quarter-wave plate required to measure ; , the analyzer; and , the orientation of the input molecular director with respect to the laboratory horizontal axis.

Image of FIG. 3.
FIG. 3.

Experimental results for the Stokes parameters , , and of the light transmitted by the TNLCD illuminated with right-handed circularly polarized light.

Image of FIG. 4.
FIG. 4.

Transmitted intensity through the TNLCD inserted between an input polarizer and an output analyzer as a function of the analyzer angle for the addressed gray level . Measured values of the transmitted intensity are represented with dots and the nonlinear fit with solid line.

Image of FIG. 5.
FIG. 5.

Representation of measured equivalent parameters and as a function of the addressed gray level .

Image of FIG. 6.
FIG. 6.

Experimental setup for generating a set of EAPSs. is the polarizer; LCD, the sample display; QWP, the quarter-wave plate; and and are, respectively, the polarizer and quarter-wave plate axis angles with respect to the input molecular director of the LCD.

Image of FIG. 7.
FIG. 7.

Representation of the final polarization states on the plane for the configuration that provides a set of EAPSs. The solid line is the least-square fit.

Image of FIG. 8.
FIG. 8.

Representation on the Poincaré sphere of the output polarization states in the configuration that provides a set of EAPSs.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Equivalent retarder-rotator approach to on-state twisted nematic liquid crystal displays