FIELD: image forming device.
SUBSTANCE: invention relates to multiscreen display device. Microcomputer calculates target brightness for each brightness mode. Each video projection display device sets target value of control current corresponding to calculated target brightness according to brightness mode set for video projection display device. Each video projection display device supplies current, indicating specified value of control current to video projection display device light source.
EFFECT: technical result is enabling control of light source suitable for calculated target brightness mode.
6 cl, 13 dwg
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