Light source unit, projector, and light source control method

A light source unit comprising:

• an excitation light source for emitting excitation light;
• an excitation light shining area for transmitting or reflecting the excitation light;
• a luminescent light emitting area having formed thereon a luminescent material layer configured to be excited by the excitation light to emit luminescent light;
• and
• a processor having a dimming mode for adjusting a quantity of light of the excitation light source by performing a turn-off control in which at least one of turning on and turning off the excitation light source is controlled in at least a partial period of a period during which the excitation light is transmitted through or is reflected by the excitation light shining area and adjusting the quantity of light of the excitation light source in a period during which the excitation light is shined onto the luminescent light emitting area.

A light source control method for a light source unit,

• wherein the light source unit comprises:
• a first light source for emitting light in a first wavelength range;
• a second light source for emitting light in a second wavelength range which differs in wavelength range from the first wavelength range;
• a display device configured to perform a gradation control on the light in the first wavelength range and the light in the second wavelength range which are emitted in a time dividing fashion in corresponding gradation control periods to thereby form image light;
• and
• a processor, and
• wherein the processor controls a first dimming mode for adjusting a quantity of the first light source in the gradation control periods during which the light in the first wavelength range and the light in the second wavelength range are emitted, respectively, and a second dimming mode for adjusting the quantity of light of the first light source by performing a turn-off control in which at least one of turning on and turning off the first light source is controlled in at least a partial period of the gradation control period during which the light in the first wavelength range is emitted and adjusting the quantity of light of the first light source in the gradation control period during which the light in the second wavelength range is emitted.