Patent ID: 6592233
Filing Date: 2003-07-15
Classification: G02B

Abstract:
A method for improving lighting of a display having a top surface for viewing, said method comprising the steps of:providing a light guiding panel substantially on the top surface of the display; and providing at least one light source adjacent to the light guiding panel for providing light thereto, wherein the light guiding panel has a first surface adjacent to the top surface of the display, a second surface opposite to the first surface, and at least one side edge for admitting a portion of the light provided by the light source through the side edge into the light guiding panel between the first and second surfaces, wherein the second surface includes a plurality of grooves having dense-rare boundaries substantially facing the light source for reflecting part of the admitted light in a total-internal reflection fashion towards the display through the first surface of the light guiding panel, and the dense-rare boundaries have a distribution density which varies according to a distance between the dense-rare boundaries and the side edge, and wherein the first surface includes a reflection reduction structure having a plurality of periodic grooves to reduce light rays reflected from the first surface toward the second surface.