Laser projection display device and laser drive control method

摘要

A laser projection display device includes: a laser light source drive unit; an attribute amount detection unit for detecting the attribute amount of a picture signal; a light sensor for measuring the light amounts of the laser light sources; and a temperature sensor for measuring the temperatures of the laser light sources. The laser projection display device is configured so that the current vs. light amount output characteristics of the laser light sources with a threshold current and current gain as a parameter are corrected in accordance with the load amount of the picture signal per frame if the change of the attribute amount exceeds a predefined amount; the light sources are driven at a predefined timing of the vertical blanking interval; controls the threshold currents and current gains in accordance with the light amounts; and the threshold currents and current gains are corrected on the basis of the measured temperatures.

主权项

1. A picture display device comprising:
a plurality of light sources; a light source drive unit that drives the light sources; a reflecting mirror that reflects emission lights from the light sources to project the reflected emission lights on an object; a mirror drive unit that drives the reflecting mirror; an attribute amount detection unit that detects the attribute amount of a picture signal from an input image signal; a scene change detection unit that detects the switching of the picture using the attribute amount of the picture signal obtained by the attribute amount detection unit; a light sensor that measures the light amounts of the light sources; a temperature sensor that measures the ambient temperatures of the light sources; a threshold current control unit that superimposes an image of a first reference signal level onto the input image signal during the vertical blanking interval of the input image signal, and controls a threshold current used as a parameter in the forward current vs. light amount characteristics of the light sources by a first step width in accordance with a first light amount value obtained by measuring the light amount of the input image signal onto which the image of the first reference signal level is superimposed using the light sensor; a current gain control unit that controls the picture signal vs. gradient of the light amount characteristics of the light sources by the first step width in accordance with the output of the temperature sensor or the attribute amount of the picture signal, the picture being projectively displayed by scanning the emission lights using the reflecting mirror, and wherein, when the scene change detection unit detects the switching of the picture, the picture signal vs. gradient of the light amount characteristics of the light sources with the threshold current as a parameter are controlled by a second step width that is wider than the first step width.