Light irradiation device

摘要

A light irradiation device to display an image by light irradiation prevents easy perception of distortion occurring in the displayed image due to vibration of the device or movement of viewpoint. A random number is generated, and the refresh rate of the displayed image is distributed at random in correspondence with the random number. The light emission intensity is changed in correspondence with the refresh rate. When the number of lines is changed, the input video signal is subjected to scaling and a display is produced. The refresh rate is changed in correspondence with the frequency of the vibration detected with the vibration monitor.

主权项

1. A light irradiation device which displays a video image by light irradiation, comprising:
a light source controller, supplied with a video signal based on the video image, that generates a luminance control signal based on the video signal; a light source driver that electric-power amplifies the luminance control signal supplied from the light source controller; a light source that generates light luminance-modulated based on the electric-power amplified luminance control signal supplied from the light source driver; a horizontal timing generator, supplied with the video signal based on the video image, that generates a horizontal pulse signal indicating horizontal synchronization timing for the video signal; a horizontal waveform generator that generates a rectangular horizontal waveform signal for scanning in a horizontal direction of the video image, based on the horizontal pulse signal generated with the horizontal timing generator; a random number generator that generates a random number; a vertical timing generator, supplied with the video signal based on the video image and the random number generated with the random number generator, that generates a vertical pulse signal, a frequency of which is varied at random based on the random number, by a predetermined or greater frequency width, with respect to a vertical synchronization frequency of the video signal; a vertical waveform generator that generates a rectangular vertical waveform signal for scanning in a vertical direction of the video image, based on the vertical pulse signal generated with the vertical timing generator; a deflection device driver, supplied with the horizontal waveform signal generated with the horizontal waveform generator and the vertical waveform signal generated with the vertical waveform generator, that electric-power amplifies and outputs the signals; and a deflection device, supplied with the light generated with the light source, that deflects the light in the horizontal direction and the vertical direction, based on the horizontal waveform signal and the vertical waveform signal outputted from the deflection device driver.