Light guides and backlight systems incorporating light redirectors at varying densities

A display, comprising:

• an array of light modulators defining a display surface;
• and
• a light guide having
• a front surface, a rear surface, and at least one edge separating the front and rear surfaces;
• a first light introduction position on one of the at least one edge;
• and
• a plurality of geometric light redirectors formed therein on one of the front surface and the rear surface of the light guide, wherein a front face of each geometric light redirector intersects with the one of the front surface and the rear surface along an intersection line;
• a rear-facing reflective layer positioned between the display surface and the front surface of the light guide, configured to reflect light towards the light guide;
• and
• a front-facing reflective layer positioned proximate the rear surface of the light guide;
• wherein the front facing reflective layer and the geometric light redirectors are configured to redirect at least 50% of the light reflected from the rear-facing reflective layer within 40 degrees of an axis perpendicular to the display surface, back towards the display surface through the front surface of the light guide within 40 degrees of the axis, and
• the plurality of geometric light redirectors are arranged such that for each geometric light redirector in a first group of geometric light redirectors, the intersection line of the geometric light redirector is substantially perpendicular to a line connecting a midpoint of the intersection line with the first light introduction position.