primary colors are transmitted through the lcd 8 and then projected by the projection lens 10 onto the screen 11 thereby displaying a color image by using the above mentioned values the maximum outgoing angle u03b8 39 max of a beam from the lcd becomes approximately 21 degrees and a projection lens having an f value 1 2 u00b7 tan u03b8 39 max of 1 3 or less is required to project all the outgoing beams onto the screen since a projection lens having an f value of 1 3 has a large aperture it is difficult to produce such a lens and the necessary cost is high this is why a projection lens having an f value of 1 8 is used in this example as a result the eclipse is generated in the g and b beams the amount of the beams reaching the screen is reduced and the color temperature is also slightly reduced nevertheless an excellent white balance can be maintained according to the present invention a projection lens having an f value larger than 1 2 u00b7 tan u03b8 39 max can be used advantageously while the upper limit of the f value is preferably set so that the balance in the intensities of the r g and b beams or a white balance is not significantly degraded for the purpose of comparison a projection lens having an f value of 1 8 is used in the case where the incident light is split into the color.