Projection device, projection control method, and storage medium, suitable for projector or the like using semiconductor light-emitting element as light source

A projection device comprising:

• a semiconductor light-emitting element;
• a rotary wheel configured to emit lights of a plurality of colors in a time-division manner by using light which the semiconductor light-emitting element emits;
• a controller configured to start, at a time of activating the projection device, rotation of the rotary wheel and output of a signal, which instructs a turn-on timing, to the semiconductor light-emitting element, in a state in which supply of power to the semiconductor light-emitting element is stopped, and to start, thereafter, the supply of the power to the semiconductor light-emitting element, based on a predetermined condition relating to an activation state;
• and
• a detection unit configured to detect a rotational phase of the rotary wheel,
• wherein the controller is configured to start the supply of the power to the semiconductor light-emitting element, at a time point when the controller has determined synchronism between the rotational phase of the rotary wheel and the turn-on timing.

A projection control method for a device including a semiconductor light-emitting element and a rotary wheel configured to emit lights of a plurality of colors in a time-division manner by using light which the semiconductor light-emitting element emits, the projection control method comprising:

• executing control to start, at a time of activating the device, rotation of the rotary wheel and output of a signal, which instructs a turn-on timing, to the semiconductor light-emitting element, in a state in which supply of power to the semiconductor light-emitting element is stopped, and to start, thereafter, the supply of the power to the semiconductor light-emitting element, based on a predetermined condition relating to an activation state;
• and
• detecting a rotational phase of the rotary wheel,
• wherein the supply of the power to the semiconductor light-emitting element is started at a time point when synchronism between the rotational phase of the rotary wheel and the turn-on timing is determined.

A non-transitory computer readable storage medium having stored therein a program which is executed by a computer, which is incorporated in a device including a semiconductor light-emitting element and a rotary wheel configured to emit lights of a plurality of colors in a time-division manner by using light which the semiconductor light-emitting element emits, the program causing the computer to perform functions comprising:

• executing control to start, at a time of activating the device, rotation of the rotary wheel and output of a signal, which instructs a turn-on timing, to the semiconductor light-emitting element, in a state in which supply of power to the semiconductor light-emitting element is stopped, and to start, thereafter, the supply of the power to the semiconductor light-emitting element, based on a predetermined condition relating to an activation state;
• and
• detecting a rotational phase of the rotary wheel,
• wherein the supply of the power to the semiconductor light-emitting element is started at a time point when synchronism between the rotational phase of the rotary wheel and the turn-on timing is determined.