Gooch and Tarry

Gooch and Tarry plot of transmission versus the coefficient, u, and the corresponding birefringence values, An, for a Twisted Nematic Liquid Crystal Display TN-LCD of thickness 6.55 pm operating between parallel polari-... 

The optical properties of aTN cell were calculated using Jones matrices by Gooch and Tarry [12]. The normalized transmittance Ttn in the OFF state in the normally white mode is given by... 

Figure 2 shows the plot of T u) as a function of M, the so-called Gooch and Tarry curve. For large values of u, the transmitted intensity T(u) drops to zero and the Mauguin limit is fulfilled. Additional intensity... 

Table 1. Necessary birefringence values to fulfill the 1st, 2nd and 3rd minimum condition according to the Gooch and Tarry curve for layer thickness d=6 pm and d=S pm.

Minima of the Gooch and Tarry curve for NB-mode Birefringence, An ... 

Figure 2. Gooch and Tarry curve for a normally black mode operated TN display.

For the NB mode, intensity minima of the transmitted luminance are calculated for dAn=0.48 pm, 1,09 pm and 1.68 pm which correspond to the minima of the Gooch and Tarry transmitted intensity for a wavelength A=0.55 pm. Operation in the 1 st minimum is mostly used in TFT displays as it offers a wider viewing angle [15, 16]. The 2nd minimum condition is used in watches and calculators. 

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