US Patent 10542241 Projector

A polarization separation element that separates a light emitted from a first light emitting device into a light having first polarization in a first wavelength range and a light having second polarization in the first wavelength range, a wavelength conversion element converts the light into a light in a second wavelength range, a first light modulation device modulates the entering light according to image information, an optical element that separates the light in the second wavelength range into a light in a third wavelength range and a light in a fourth wavelength range, a second light modulation device that modulates the light according to the image information, a third light modulation device that modulates the light according to the image information, and a projection system that projects an image light are provided, wherein the wavelength conversion element has a first surface and a second surface different from the first surface.