Patent ID: 6099134
Filing Date: 2000-08-08
Classification: G02B

Abstract:
A liquid crystal display device, comprising:a liquid crystal cell array; anda backlighting unit disposed at a rear side of said liquid crystal cell array and including at least a light guide plate,wherein at least either a top surface or a bottom surface of said light guide plate or alternatively a top surface or a bottom surface of an optical member disposed on the top or bottom surface of said light guide plate is provided with dots selected from a group consisting of (A) at least one of convex-shaped and concave-shaped dots having a property of at least one of reflecting, scattering, refracting, diffracting, absorbing, transmitting, polarizing and deflecting light rays, (B) dots having mutually different optical properties and (C) dots imparted with optical activity, andwherein in a region covering more than 80% of a whole dot-formed surface of said light guide plate or alternatively said optical member in which said dots are to be formed, said dots are so formed and disposed as to satisfy conditions that said dot-formed surface is divided into square regions each of 1 to 4 mm.sup.2, value of a function g(R) obtained by averaging with weight values of radial distribution functions G(R) determined for each of said dots in each of said square regions in dependence on dot dispositional relations of said each dot to the other dots, respectively, and approximating a mean value of said radial distribution function values by a least square method falls within a range given by0<S1/S2<0.4provided that a ratio R/R0 is within a range of ""3"" to ""6"",whereR represents a distance from a center position of a given dot to another one as determined for each of said dots;R0 represents a value obtained by dividing length of one side of said square region by a square root of the number of the dots contained in said square region;S1 represents a value obtained by integrating a difference between a value of said function G(R) and a mean value of said functions G(R) with said ratio R/R0 on the condition that the value of said ratio R/R0 is within a range of ""3"" to ""6""; andS2 represents a value obtained by integrating said mean value of said functions G(R) with said ratio R/R0 on the condition that the value of said ratio R/R0 is within a range of ""3"" to ""6"".