A backlight emits diffused light beams. An emission direction characteristic-forming plate allows light beams which have been incident thereon at generally right angles therewith to pass therethrough and intercepts light beams which have been incident thereon obliquely. An image display/input...http://www.google.fr/patents/US5675357?utm_source=gb-gplus-shareBrevet US5675357 - Image display/input apparatus
