Patent ID: 7339638

Claim:
A micro-lens substrate provided on a light-incident side of a liquid crystal display element for use in a projection-type liquid crystal display device, the micro-lens substrate including: (a) a first micro-lens array having a first micro lens for converging a plurality of light beams whose incident angles are different from one another on picture elements of the liquid crystal element respectively corresponding to the light beams; and (b) a second micro-lens array having a second micro lens for collimating principal rays of the respective light beams converged, by the first micro lens, on the respectively corresponding picture elements, wherein: the second micro-lens is substantially trapezoid so that: the second micro-lens includes (I) a center portion perpendicular to a principal ray of the light beam incident on the center portion and (II) side portions each having a convex slanted surface which is slanted at a predetermined angle with respect to a principal ray of an incident light beam and directs its convex part towards the light incident side, the incident light beam being incident on each of the side portions.