| 摘要 |
PURPOSE:To improve the brightness by obtaining polarized light components as one piece of luminous flux by the light source device after spectrally diffracting the luminous flux from one light source into two pieces of luminous flux of different polarized components. CONSTITUTION:The luminous flux from the light source 109 are separated by a polarization beam splitter 11 into luminous flux 12 of a P-polarized light component and luminous flux 13 of an S-polarized light component, and the luminous flux 13 of the separated S-polarized light component is converted by a 1/2 wavelength plate 15 into luminous flux 14 of the same P-polarized light component with the luminous flux 12 of the P-polarized light component, so even when the luminous flux from one light source 109 are separated into different polarized light components, the pieces 12 and 14 of luminous flux of the same polarized-light component can be obtained, and multiplexed by a total reflection type multiplexing prism 17 and projected. Consequently, luminance which is almost double can be obtained as compared with conventional cases wherein a polarized light filter selects luminous flux of one polarized light component and absorbs luminous flux of the other polarized light component. |
