Hitachi, Ltd.

Chihiro Egawa

Koji Hirata

Naoyuki Ogura

Kazunari Nakagawa

Tomoharu Nakiri

The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen. The projection lens corresponding to the red image generating source includes a light transmitter that satisfies the condition: TRS<TRL/3, wherein TRS is the transmittance with respect to a wavelength &lgr; RSmax of sub-peak energy of a spurious component existing in a short-wavelength-sided region rather than a peak energy waveform &lgr; Rmax of a spectral distribution of the red image light, and TRL is the transmittance with respect to a wavelength &lgr; RLmax of sub-peak energy of a spurious component existing in a long-wavelength-sided region rather than the peak energy wavelength &lgr; Rmax of the spectral distribution of the red image light.

Projection image display apparatus

The projection image display apparatus includes a plurality of image generating sources for generating three primary colors, including red, green, blue image light, respectively, and a projection lens containing a plurality of lens elements provided in correspondence with each of said image generating sources for enlarging/projecting images displayed by the image generating sources onto a screen. The projection lens corresponding to the red image generating source includes a light transmitter that satisfies the condition: TRS&lt;TRL/3, wherein TRS is the transmittance with respect to a wavelength .lambda. RSmax of sub-peak energy of a spurious component existing in a short-wavelength-sided region rather than a peak energy waveform .lambda. Rmax of a spectral distribution of the red image light, and TRL is the transmittance with respect to a wavelength .lambda. RLmax of sub-peak energy of a spurious component existing in a long-wavelength-sided region rather than the peak energy wavelength .lambda. Rmax of the spectral distribution of the red image light.

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Yokohama, Japan

Chihiro Egawa