| 摘要 |
PROBLEM TO BE SOLVED: To obtain a reflection type liquid crystal display panel which is bright and has a high contrast by holding supertwisted nematic(STN) liquid crystal layers and phase difference plates between one sheet of polarizing plate and a reflection film and compensating the dependence on incident and exit angles by specifying the Z coefft. of a phase difference plate. SOLUTION: The STN liquid crystal layers 7 twisted from 180 to 260 deg. are sandwiched between one sheet of the polarizing plate 10 and a mirror reflection film 3, and the phase difference plates 8, 9 are arranged between the polarizing plate 10 and the STN liquid crystal layers 7. By setting the coefft. Z=(nz-np)/(ns-np) when the refractive index in the delay axis direction of the phase difference plate 9 nearest to the polarizing plate 10 of the phase difference plates 8, 9 is np, the refractive index of the advance phase axis direction is ns and the refractive index in the thickness direction is nz, to 0.3 to 0.7, a black display is made black and a visual field angle is made wider. Preferably, the value obtd. by dividing the double refractive index (Δn) for light of 450nm by Δn for light of 590nm is determined as a Δn wavelength dispersion value, by which the difference in the Δn wavelength dispersion value between the STN liquid crystal layers 7 and the phase difference plate 9 is made smaller than 0.08. |
