LIGHTING DEVICE WITH LIGHT CONTROL MEMBER AND IMAGE DISPLAY UNIT USING THE ABOVE

摘要

It is a purpose to provide a lighting device which is easy to respond to an increase in size, luminance non-uniformity in front direction is eliminated without a precise alignment between light sources and other members and is advantageous for improvement of productivity and thinner shape. Suppose that a distance between centers of linear light sources is D and a distance between the linear light sources and a light control member is H and a function representing an outgoing light intensity toward a normal direction at a position coordinate X (light source position shall be X=0) and f(X-D)+f(X)+f(X+D), in a range of - D/2‰ -X‰ -D/2, a ratio between g(X) min and g(X) max is 0.6 or more, a minimum value X min is in a range of -3.0D‰ X min ‰ -0.5D, a maximum value X max is in a range of 0.5‰ X max ‰ 3.0D and a cross-sectional shape of a given convex portion in X direction is formed of areas with (2N+1) number of different gradients represented by a certain relationship which is obtained from D, H and X.