Multi-screen display device

摘要

There has been a problem of displacement of luminance and chromaticity among multiple screens due to a temperature change and a temporal change of a light source of the screen. The present invention provides a multi-screen display device including a plurality of image display devices, in which one master device and one or a plurality of slave devices communicable with the master device are included, each of the image display devices is provided with a DMD that modulates light of a light source, a screen that projects an image by modulated output light of the DMD, and an RGB luminance sensor that detects luminance of light from the DMD in an off-state, to output a luminance detection value, the master device is provided with a setting part that sets a luminance setting value unified among the plurality of image display devices based on a value in accordance with the luminance detection values, and each image display device is further provided with a luminance/chromaticity corrector that controls luminance/chromaticity of an image displayed on the screen based on the luminance setting value.

主权项

1. A multi-screen display device comprising a plurality of image display devices, wherein
said plurality of image display devices include one master device and one or a plurality of slave devices communicable with said master device, each of said image display devices comprising: a light source; a light valve that modulates light of said light source; a screen onto which an image is projected by modulated output light of said light valve; and a luminance sensor that detects luminance of light from said light valve and outputs a luminance detection value in a case of said light valve being in an off-state, wherein said master device includes a setting part that sets a luminance setting value unified among said plurality of image display devices based on a value in accordance with said luminance detection values in said plurality of image display devices, wherein each of said image display devices further comprising:
a controller that controls luminance/chromaticity of an image displayed on said screen in each device based on said luminance setting value;a storing part that stores said luminance detection value;a calculator that calculates a luminance change value as a value in accordance with said luminance detection value by use of said luminance detection value stored into said storing part and an initial luminance detection value stored into said storing part;a temperature sensor that detects a temperature in said luminance sensor;a corrector that corrects said luminance detection value by use of an output of said temperature sensor, and outputs a temperature-corrected luminance value; andan operator that computes an individual correction factor specific to each of said image display devices based on said target luminance value, whereinsaid setting part in said master device sets a target luminance change value as said luminance setting value with respect to a target luminance value unified among said plurality of image display devices, based on said luminance change values in said plurality of image display devices,said storing part stores said temperature-corrected luminance value and said individual correction factor,said calculator calculates a luminance change value by use of said temperature-corrected luminance value stored into said storing part and an initial temperature-corrected luminance value stored into said storing part, andsaid controller corrects said individual correction factor based on said target luminance change value, and controls luminance/chromaticity of an image displayed on said screen in each device based on said corrected individual correction factor.