Display device and text display method that make use of a font defining variable ray direction dependent distributions.

摘要

A display device is provided for displaying text to users that need a reading aid. The device has a display screen that provides for control of distributions of transmitted light intensity as a function of ray direction at each of a plurality of locations of pixels or groups of pixels on the display screen. A processor retrieves font data under control of successive characters in received text data, the font data defining character fields for a set of characters in the font, each character field with a pattern of ray direction dependent light intensity distributions as a function of position in the character field. The patterns are configured to sharpen character outlines in the projection of light from the display screen on a retina, under conditions wherein the reading aid is not used. The processor controls patterns of ray direction dependent light intensity distributions oflight transmitted from successive character locations on the display screen dependent on the retrieved font data for the successive characters.