Patent ID: 6320628
Filing Date: 2001-11-20
Classification: G02B,G02F,H04N

Abstract:
A projection type color liquid crystal display apparatus comprising:a light source for generating a luminous flux;a polarization conversion section for receiving said luminous flux to convert said luminous flux into a unified luminous flux having a same linearly-polarized light component reflected in a same direction;a color separation section mounted on said polarization conversion section for receiving said unified luminous flux to selectively reflect a plurality of color components of said unified luminous flux individually, said color separation section having at least two light reflection layers at different angles; a microlens array including a plurality of convex lenses, each receiving reflected color components; and a liquid crystal display means receiving said reflected color components and including a liquid crystal display element sandwiched by first and second polarization plates, each of said convex lenses converging said reflected color components into different pixels of said liquid crystal element;wherein said polarization conversion section comprises:a first polarization beam splitter for receiving said luminous flux to reflect an S-polarized component of said luminous flux, and pass a P-polarized component of said luminous flux there through, the S-polarized component of said luminous flux being transmitted to said color separation section, a second polarization beam splitter adjacent said first polarization beam splitter for receiving the polarized component of said luminous flux from said first polarization beam splitter to pass the P-polarized component of said luminous flux; and an optical retardation plate and a mirror for receiving the P-polarized component of said luminous flux from said second polarization beam splitter, so that the polarized component of said luminous flux is converted into an S-polarized component of said luminous flux, said second polarization beam splitter reflecting the converted S-polarized component of said luminous flux and transmitting the converted S-polarized component of said luminous flux to said color separation section, said unified luminous flux being formed by the polarized component of said luminous flux and the converted S-polarized component of said luminous flux.