A projector comprising a light source unit comprising at least two semiconductor light emission elements , wherein the light source unit is adapted to cyclically emit a plurality of lights, each having a different color component, and wherein the color components are switched according to a light source switch timing; a display element adapted: - to display, for each color component, a color field of a plurality of color fields corresponding to the color component, and - to form, for each color component, an optical image corresponding to the color component, wherein the plurality of color fields constitute one frame of a color image; a projection unit adapted to project the optical images corresponding to the color components toward a projection object; a projection controller adapted to set: - a spoke period of a color wheel, wherein the spoke period has a start timing and an end timing, - a color filter switch timing of the color wheel, wherein the color filter switch timing occurs half-way through the spoke period, and - one of the start timing and the end timing of the spoke period to coincide with the light source switch timing; and a projection drive unit adapted to control the display element based on - the color filter switch timing of the color wheel, - the start timing of the spoke period, and - the end timing of the spoke period, such that, when the projection unit switches between a primary color field and a complementary color field, the corresponding spoke period of the color wheel is positioned entirely in the complementary field. a light source unit comprising at least two semiconductor light emission elements , wherein the light source unit is adapted to cyclically emit a plurality of lights, each having a different color component, and wherein the color components are switched according to a light source switch timing; a display element adapted: - to display, for each color component, a color field of a plurality of color fields corresponding to the color component, and - to form, for each color component, an optical image corresponding to the color component, - to display, for each color component, a color field of a plurality of color fields corresponding to the color component, and - to form, for each color component, an optical image corresponding to the color component, wherein the plurality of color fields constitute one frame of a color image; a projection unit adapted to project the optical images corresponding to the color components toward a projection object; a projection controller adapted to set: - a spoke period of a color wheel, wherein the spoke period has a start timing and an end timing, - a color filter switch timing of the color wheel, wherein the color filter switch timing occurs half-way through the spoke period, and - one of the start timing and the end timing of the spoke period to coincide with the light source switch timing; and - a spoke period of a color wheel, wherein the spoke period has a start timing and an end timing, - a color filter switch timing of the color wheel, wherein the color filter switch timing occurs half-way through the spoke period, and - one of the start timing and the end timing of the spoke period to coincide with the light source switch timing; and a projection drive unit adapted to control the display element based on - the color filter switch timing of the color wheel, - the start timing of the spoke period, and - the end timing of the spoke period, - the color filter switch timing of the color wheel, - the start timing of the spoke period, and - the end timing of the spoke period, such that, when the projection unit switches between a primary color field and a complementary color field, the corresponding spoke period of the color wheel is positioned entirely in the complementary field. <EOS>