Compensation plate for tilted plate optical aberrations

A color light valve system comprising beam splitting means for splitting light into respective optical paths and respective different wavelengths;

• light valve means disposed in each of said optical paths for modulating red, green and blue light;
• means for combining the modulated red, green and blue light;
• means for projecting the combined light to a display;
• and compensation means disposed in at least one of said optical paths for eliminating optical aberrations,
• wherein said at least one of said optical paths is the optical path for red light, said compensation means comprising at least a first tilted plane-parallel plate disposed in said one optical path for red light, said first plate producing aberrations of an optical image, and at least a second tilted plane-parallel plate disposed in said optical path for red light, said second plate having been rotated about the optical axis by 90 degrees with respect to said first plate to virtually eliminate at least one of astigmatism and coma aberrations.