Patent ID: 6547421
Filing Date: 2003-04-15
Classification: G02B,H04N

Abstract:
A video display apparatus comprising:a light source unit having a plurality of light source sections each having a light source formed from one of a semiconductor light emitting element and a white light lamp and a coupling optical element for converting light emitted from said light source into substantially parallel light, said light source unit including a condenser lens being operable to condense said light from said light source sections having passed through each said coupling optical element at a predetermined focus position on an optical axis of illuminating said video display apparatus, wherein said light source sections are disposed on a plane in said light source unit such that said light from said light source sections is condensed at said predetermined focus position of said condenser lens; an integrator disposed at the predetermined focus position of said light source unit for equalizing an intra-plane light intensity distribution of said light emitted from said light source unit; and a light valve of a substantially rectangular shape upon which said light whose intra-plane light intensity distribution has been equalized by said integrator is irradiated, and said light source unit further includes a condenser lens, and said light source sections are disposed on a plane in said light source unit such that said light from said light source sections is condensed at said predetermined focus position by said condenser lens, and wherein a focal distance of said condenser lens is represented by L, a maximum distance from said optical axis of said video display apparatus to an optical axis of each of said light source sections is represented by H, and said light source unit is designed so as to satisfy a relationship given by: |H/L|<0.27.