Patent ID: 6776494
Filing Date: 2004-08-17
Classification: G02B,G09F

Abstract:
A method of forming a light scatterer dot pattern on a bottom surface of a plate-like light guiding member in a planar light source apparatus including said light guiding member; and bottom plate covering a bottom surface of said light guiding member; a casing frame covering side faces of said light guiding member; and dot-like light sources provided on one side face or on two side faces opposite to each other of said light guiding member and emitting light to said light guiding member; said method comprising the steps of:a) forming a light scatterer homogeneously all over a bottom surface of a trial light guiding member, the trial light guiding member having a size and composition that is substantially equivalent to said light guiding member; b) assembling a trial planar light source apparatus using said trial light guiding member prepared in step (a); c) measuring a luminance value at each coordinate point on a light-emitting surface of the trial light guiding member of said trial planar light source apparatus; d) converting the measure luminance value at each coordinate point to standardized value by applying an inverse-proportional operation to the measured luminance value, using a lowest value in a distribution of the measured luminance values as a reference value; e) calculating an area of a light scatterer dot at each coordinate point from the standardized value obtained from the conversion in step (d); and f) forming a pattern of light scatterer dots each area thereof is calculated in step (e) on a bottom surface of a light guiding member different from said trial light guiding member.