Lateral color compensation for projection displays

摘要

Compensation of lateral-color chromatic-aberration effects in a digital color-graphics projection display is achieved by providing projection optics for the projection display which is nontelecentric to a certain degree to establish an angled geometry for gathering light off axis for projection by the projection optics and by providing a plurality of component-primary-color object planes for object digital graphics of different primary colors to be projectively displayed through the projection optics. At least two of the component-primary-color object planes are located at different effective axial distances from the projection optics. The effective axial distances of the object planes from the projection optics are respectively keyed to the angled nature of the off-axis light gathering of the projection optics and to the lateral-color chromatic-aberration differences in lateral magnification by the projection optics at different primary colors so that such color-dependent differences in lateral magnification tend to be compensated.