Projection type image display system and color correction method thereof

A projection type image display system comprising:

• color image displaying means for displaying an image to be projected onto a screen;
• means for storing a correlation between an initial XYZ-tristimulus value of an image projected onto the screen at the time of initial adjustment and an initial luminance value of the image projected onto the screen at the time of initial adjustment;
• luminance measuring means for measuring a maximum luminance value of each of primary colors of an image projected onto the screen upon lapse of a predetermined time from the initial adjustment;
• means for estimating an XYZ-tristimulus value of the image on the screen upon lapse of the predetermined time based on the maximum luminance value and the correlation;
• and
• means for calculating a color correction coefficient based on the estimated XYZ-tristimulus value.

A projection type image display system comprising:

• image displaying means for displaying an image;
• a projection optical system which projects the image displayed by the image displaying means;
• and
• a screen which displays the image projected by the projection optical system,
• wherein the projection optical system includes:
• a reflecting mirror which reflects light from the image displaying means toward the screen and is configured in such a manner that a reflecting surface has a uniform reflectance;
• and
• luminance measuring means which is provided on a surface opposite to the reflecting surface and measures a luminance value of light transmitted through the reflecting mirror from the image displaying means.

A projection type image display system which displays a single color image by using a plurality of partial color images, comprising:

• a plurality of partial color image displaying means each of which receives color image data and displays a partial color image;
• a plurality of luminance measuring means each of which measures a luminance value of an image displayed by a corresponding one of the partial color image displaying means;
• comparing means for comparing a plurality of the luminance values measured by the plurality of the luminance measuring means;
• and
• warning means for performing warning based on a comparison result obtained by the comparing means.

A projection type image display system which displays a single color image by using a plurality of partial color images, comprising:

• a plurality of partial color image displaying means each of which receives color image data and displays a partial color image;
• a plurality of luminance measuring means each of which measures a luminance value of an image displayed by a corresponding one of the partial color image displaying means;
• evaluating means for numerically evaluating an age-based change factor of an image based on a measurement result obtained by the luminance measuring means;
• and
• warning means for performing warning based on an evaluation result obtained by the evaluating means.

A projection type image display system comprising:

• image displaying means for displaying an image;
• a projection optical system which projects the image displayed by the image displaying means;
• and
• a screen which displays the image projected by the projection optical system,
• wherein the projection optical system includes:
• a reflecting mirror which reflects light from the image displaying means toward the screen;
• luminance measuring means for measuring a luminance value of the light reflected by the reflecting mirror;
• and
• reflecting mirror driving means which changes an angle of the reflecting mirror in such a manner that the luminance measuring means is not irradiated with the light reflected by the reflecting mirror when projecting a regular image and that the luminance measuring means is irradiated with the light reflected by the reflecting mirror when measuring a luminance value.

A projection type image display system comprising:

• image displaying means for displaying an image;
• a projection optical system which projects the image displayed by the image displaying means and has luminance measuring means for measuring a luminance value of light from the image displaying means;
• a screen which displays the image projected by the projection optical system;
• moving means for moving the luminance measuring means in such a manner that the luminance measuring means is not irradiated with light from the image displaying means when projecting a regular image and that the luminance measuring means is positioned between the screen and the image displaying means when measuring a luminance value;
• and
• shielding means for preventing external light which is transmitted through the screen and enters the image displaying means side.

A projection type image display system comprising:

• image displaying means for displaying an image;
• a projection optical system which projects the image displayed by the image displaying means and has luminance measuring means for measuring a luminance value of light from the image displaying means;
• a screen which displays the image projected by the projection optical system;
• and
• moving means for moving the luminance measuring means on a surface of the screen opposite to a surface on the image displaying means side of the screen in such a manner that the luminance measuring means is not irradiated with light from the image displaying means when projecting a regular image and that the luminance measuring means is irradiated with light from the image displaying means when measuring a luminance value.