Illumination control device and illumination system

An illumination system comprising:

• a host control device configured to transmit color information and brightness information;
• and
• an illumination control device configured to control output duty ratios of pulse signals output to a red light emitting element, a green light emitting element, and a blue light emitting element such that the red light emitting element, the green light emitting element, and the blue light emitting element emit light with colors indicated by the color information and brightness indicated by the brightness information transmitted from the host control device, wherein
• the illumination control device includes:
• a first acquisition unit configured to acquire the color information and the brightness information transmitted from the host control device;
• a first storage unit that stores duty ratios of the red light emitting element, the green light emitting element, and the blue light emitting element for each piece of color information;
• a second storage unit that stores a reference duty ratio for each piece of brightness information;
• a second acquisition unit configured to acquire the duty ratios of the red light emitting element, the green light emitting element, and the blue light emitting element corresponding to the color information acquired from the first storage unit;
• a third acquisition unit configured to acquire the reference duty ratio corresponding to the brightness information acquired from the second storage unit;
• a calculation unit configured to calculate the output duty ratios by multiplying the duty ratios of the red light emitting element, the green light emitting element, and the blue light emitting element acquired by the second acquisition unit by the reference duty ratio acquired by the third acquisition unit;
• and
• an output unit configured to output the pulse signals with the output duty ratios calculated by the calculation unit to the red light emitting element, the green light emitting element, and the blue light emitting element,
• wherein a first number of bits of the duty ratios stored by the first storage unit is equal to a number of light emitting elements, including the red light emitting element, the green light emitting element, and the blue light emitting element, multiplied by both a data amount indicating the duty ratios and a number of colors represented by the each piece of color information,
• wherein a second number of bits of the reference duty ratio stored by the second storage unit is equal to both the data amount indicating the duty ratios multiplied by a number of stages represented by the each piece of brightness information.