Microlens substrate, and liquid crystal display element provided with it, and projection liquid crystal display unit

A projection-type liquid crystal display device comprising:

• A) a white beam source;
• B) a light beam dividing section for dividing a white beam emitted from the white beam source into a plurality of light beams whose respective wavelength bands are different from one another;
• C) a liquid crystal display element to which the plurality of the light beams obtained from the light beam dividing section are incident, the light beams whose respective incident angles are different from one another;
• D) two-layers of micro-lens arrays, provided on a light-source side of the liquid crystal display element, 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 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;
• and
• E) a projecting section for projecting the plurality of the light beams being modulated by the liquid crystal display element,
• 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 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.