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1. A projection display device comprising: a first image light emission device configured to emit a first color light component and a second color light component in first image light in a time-division manner, a second image light emission device configured to emit a first color light component and a second color light component in second image light in a time-division manner; an optical combination system configured to combine the first image light with the second image light in a state in which the second image light is shifted in a first direction relative to the first image light, and emit a combination light; a light path shift element configured to shift a light path for the combination light emitted from the optical combination system; and a display control circuit configured to control the first image light emission device, the second image light emission device, and the light path shift element, wherein a one-frame period includes first to fourth unit periods, the display control circuit supplies a video pixel aligned in the first direction at an odd-numbered position in a second direction intersecting the first direction in video pixel data among data signals corresponding to gradation levels designated by the video pixel data arranged in a matrix, the video pixel being a data signal of the first light component, to the first image light emission device, supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of one of the first light component and the second light component, to the second image light emission device, and controls the light path shift element so that the light path is set as a reference position in the first unit period, supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the first light component to the first image light emission device, supplies the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data, the video pixel being a data signal of one of the first light component and the second light component, to the second image light emission device, and controls the light path shift element so that the light path is shifted in the second direction in the second unit period, supplies the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the second light component, to the first image light emission device, supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the other of the first light component and the second light component, to the second image light emission device, and controls the light path shift element so that the light path returns to the reference position in the third unit period, and supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the second light component, to the first image light emission device, supplies the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the other of the first light component and the second light component, to the second image light emission device, and controls the light path shift element so that the light path is shifted in the second direction in the fourth unit period, and the first image light emission device emits the first image light based on the supplied data signal, and the second image light emission device emits the second image light based on the supplied data signal, wherein the first image light emission device further emits a third light component in the first image light in a time-division manner, the second image light emission device further emits a third light component in the second image light in a time-division manner, the one-frame period further includes a fifth unit period and a sixth unit period, the display control circuit, supplies the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the third light component, to the first image light emission device, supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the third light component, to the second image light emission device, and controls the light path shift element so that the light path returns to the reference position in the fifth unit period, and supplies the video pixel aligned in the first direction at an even-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the third light component, to the first image light emission device, supplies the video pixel aligned in the first direction at an odd-numbered position in the second direction in the video pixel data, the video pixel being a data signal of the third light component, to the second image light emission device, and controls the light path shift element so that the light path is shifted in the second direction in the sixth unit period.
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