| 摘要 |
An image projection apparatus controls to vary at least one of current, voltage and power of a discharge lamp for each color segment by means of at least two control signals. When the discharge lamp reaches the stable state after turned on, the discharge lamp exhibits the constant voltage characteristic and an amount of light emitted from the lamp is varied in accordance with current or voltage applied thereto. The light amount of the lamp is varied to at least 3 stages simultaneously in accordance with an image signal in synchronism with color to be emphasized and weakened in each color (e.g. red, blue, green and white).
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