| 摘要 |
PURPOSE:To decrease reflected light and to improve the visibility of displays by providing a transparent dielectric layer on the transparent electrode of a transparent substrate, and specifying the relations between the respective optical film thicknesses of the transparent electrode and the layer and design wavelengths. CONSTITUTION:A transparent electrode 3 having a reflective index n1 and a film thickness d1 is provided on a transparent substrate 2 having a refractive index n0. A transparent dielectric layer 4 of which the refractive index changes continuously from n2 to n3 in the direction (d) of thickness is formed thereon. A liquid crystal 5 of a refractive index nLC is provided on the layer 4. Here the relations between the products of the respective refractive indices and film thicknesses of the electrode 3 and the layer 4, that is, the optical film thicknesses, and the design wavelengths to be used are specified like the equations (I), (II). When the design wavelength lambda is set at 640mmu, and N1=N2=1, the reflection characteristics in the visible region of the electrode substrate are shown by a curve 51. The reflection thereof is <=2% and the liquid crystal display element of good visibility is obtained. |
