Image display device
An image display device includes a light source, a screen, an optical system, a screen driving mechanism unit, a memory unit, and a screen driving circuit unit. An image is formed on the screen by being irradiated with light from the light source. The screen driving mechanism unit moves the screen in an optical axis direction of the light. A smoothed movement profile is obtained by smoothing a movement profile used as a target for moving the screen so as to make a moving speed of the screen vary gently. The memory unit stores screen driving waveform information that has been generated so that the screen follows the smoothed movement profile. The screen driving circuit unit drives the screen driving mechanism unit, based on the screen driving waveform information stored in the memory unit.
1. An image display device comprising:
a light source;
a screen which is irradiated with light from the light source to form an image;
an optical system that generates a virtual image with the light from the screen;
a screen driving mechanism unit that moves the screen in an optical axis direction of the light emitted from the light source;
a memory unit in which screen driving waveform information is stored, the screen driving waveform information being generated such that the screen follows a smoothed movement profile, the smoothed movement profile being obtained by smoothing a movement profile so as to make a moving speed of the screen vary, the movement profile being used as a target for moving the screen; and
a screen driving circuit unit that drives the screen driving mechanism unit, based on the screen driving waveform information stored in the memory unit,
wherein the smoothed movement profile is obtained by smoothing the movement profile with a simple moving average method or a weighted moving average method.
2. The image display device according to claim 1 , wherein
the screen driving waveform information is current waveform information of a screen drive for use in driving the screen.
3. The image display device according to claim 1 , wherein
the screen driving waveform information is voltage waveform information of a screen drive for use in driving the screen.
4. The image display device according to claim 1 , wherein
the screen driving mechanism unit includes:
a holder unit that holds the screen;
a magnetic coil unit supported by the holder unit; and
a suspension unit that supports the holder unit so as to enable the holder unit to move in the optical axis direction.
5. An image display device comprising:
a light source;
a screen which is irradiated with light from the light source to form an image;
an optical system that generates a virtual image with the light from the screen;
a screen driving mechanism unit that moves the screen in an optical axis direction of the light emitted from the light source;
a memory unit in which screen driving waveform information is stored, the screen driving waveform information being generated such that the screen follows a movement profile, the movement profile being used as a target for moving the screen; and
a screen driving circuit unit that drives the screen driving mechanism unit, based on the screen driving waveform information stored in the memory unit,
wherein the screen driving waveform information is generated based on a motional property of the screen driving mechanism unit and is current waveform information of a screen drive for use in driving the screen.
6. The image display device according to claim 5 , wherein
the screen driving mechanism unit includes:
a holder unit that holds the screen;
a magnetic coil unit supported by the holder unit; and
a suspension unit that supports the holder unit so as to enable the holder unit to move in the optical axis direction.
7. An image display device comprising:
a light source;
a screen which is irradiated with light from the light source to form an image;
an optical system that generates a virtual image with the light from the screen;
a screen driving mechanism unit that moves the screen in an optical axis direction of the light emitted from the light source;
a memory unit in which screen driving waveform information is stored, the screen driving waveform information being generated such that the screen follows a movement profile, the movement profile being used as a target for moving the screen; and
a screen driving circuit unit that drives the screen driving mechanism unit, based on the screen driving waveform information stored in the memory unit,
wherein the screen driving waveform information is generated based on a motional property of the screen driving mechanism unit and is voltage waveform information of a screen drive for use in driving the screen.
8. The image display device according to claim 7 , wherein
the screen driving mechanism unit includes:
a holder unit that holds the screen;
a magnetic coil unit supported by the holder unit; and
a suspension unit that supports the holder unit so as to enable the holder unit to move in the optical axis direction.