Abstract: A projection device includes 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, and a controller configured 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.

Abstract: Disclosed is a light source unit which emits fluorescence light to a display element which displays an image by using the fluorescence light including an excitation light source which emits excitation light, a fluorescent plate including a fluorescence emission region on a surface of a circular substrate which emits the fluorescence light by the fluorescence emission region being irradiated with the excitation light from the excitation light source, a drive unit which rotates the fluorescent plate in a circumferential direction and a control unit which controls the excitation light source and the drive unit. And the control unit controls the drive unit so that a display frequency of the display element and a rotation frequency of the fluorescent plate fulfill formula (1) j×display frequency=k×rotation frequency (j, k are integers, j>k)??(1).

Abstract: An electronic device includes: a storage battery; a residual quantity detection section that detects an electrical storage residual quantity of the storage battery; a setting member for receiving an input of a user setting including a plurality of options; a permission/prohibition deciding member that decides whether or not selection of each of the options corresponding to the user setting received by the setting member is permitted on the basis of the electrical storage residual quantity detected by the residual quantity detection section; and an indicating member that indicates an option which is prohibited from being selected by the permission/prohibition deciding member and an option which is permitted to be selected by the permission/prohibition deciding member so that each of the option prohibited from being selected and the option permitted to be selected is distinguishable.

Abstract: A projection device includes 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, and a controller configured 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.

Abstract: A display apparatus includes a screen, a setting unit and a processor. The setting unit is for setting a product and is provided at the screen. The processor controls display on the screen on a basis of the product which is set at the setting unit.

Abstract: Disclosed is a light source unit which emits fluorescence light to a display element which displays an image by using the fluorescence light including an excitation light source which emits excitation light, a fluorescent plate including a fluorescence emission region on a surface of a circular substrate which emits the fluorescence light by the fluorescence emission region being irradiated with the excitation light from the excitation light source, a drive unit which rotates the fluorescent plate in a circumferential direction and a control unit which controls the excitation light source and the drive unit.

Abstract: An electronic device includes: a storage battery; a residual quantity detection section that detects an electrical storage residual quantity of the storage battery; a setting member for receiving an input of a user setting including a plurality of options; a permission/prohibition deciding member that decides whether or not selection of each of the options corresponding to the user setting received by the setting member is permitted on the basis of the electrical storage residual quantity detected by the residual quantity detection section; and an indicating member that indicates an option which is prohibited from being selected by the permission/prohibition deciding member and an option which is permitted to be selected by the permission/prohibition deciding member so that each of the option prohibited from being selected and the option permitted to be selected is distinguishable.

Abstract: A projector includes an input unit which inputs an image signal, a projection unit which projects an achromatic luminance image and a chromatic image on the basis of the image signal input by the input unit, an image processing unit which performs a sharpening processing to emphasize a high-frequency component in the image signal in accordance with a sharpening parameter to the image signal input by the input unit, and a projection control unit which controls a luminance image projection time of the luminance image for the chromatic image projected in the projection unit, a value of the sharpening parameter and the luminance image projection time being associated with each other.

Abstract: A projector includes an input unit which inputs an image signal, a projection unit which projects an achromatic luminance image and a chromatic image on the basis of the image signal input by the input unit, an image processing unit which performs a sharpening processing to emphasize a high-frequency component in the image signal in accordance with a sharpening parameter to the image signal input by the input unit, and a projection control unit which controls a luminance image projection time of the luminance image for the chromatic image projected in the projection unit, a value of the sharpening parameter and the luminance image projection time being associated with each other.

Abstract: A projection apparatus includes a storage unit configured to store an image signal input via the input unit, a comparison unit configured to compare an image signal input via the input unit with an image signal already stored in the storage unit and determine one of coincidence and inconsistency between the compared two image signals, a time-measurement unit configured to measure a time of a state in which coincidence between the compared two image signals is determined by the comparison unit, a determining unit configured to determine whether or not a time-measurement result by the time-measurement unit exceeds a preset time, and a projection control unit configured to variably set the light-emission luminance of the light source to be lowered according to a determination result of the determining unit.