Optical lens system, image display apparatus, micro-lens array, liquid crystal display device, and liquid crystal display apparatus of projection-type

摘要

An optical lens system in accordance with the present invention is arranged so that, when the micro-lens has a curved surface satisfying an inequality of (n2/n1)xsin(thetamax)>=1, where n1 indicates an index of refraction of a medium constituting one side of the curved surface of the lens, n2 (n1<n2) indicates an index of refraction of a medium constituting the other side of the curved surface of the lens, theta indicates an incident angle of the light with respect to a plane-normal of the curved surface of the lens when the light from the light source is directed to the curved surface of the lens of the micro-lens from a side of the medium having the index of refraction of n2, and theta max indicates a maximum value of the angle theta in the curved surface of the micro-lens, the micro-lens array is provided so that the light from the light source is directed to the micro-lens from the side of the medium having the index of refraction of n1. When using such an optical lens system as an image display apparatus of projection-type, it is possible to obtain the bright projection image.