Liquid crystal image screen has collimator containing three-dimensional micro-prisms, each with at least one constriction between light entry and output surfaces

摘要

The device has a background lighting system containing at least one light source (1) and a collimator (4) of micro-prisms of three-dimensional form with a light entry surface, a separate light output surface and at least one lateral surface between them. Each micro-prism has at least one constriction between the light entry and output surfaces. Independent claims are also included for the following: a background lighting system, a collimator and a light.