Correction characteristic determining device, correction characteristic determining method, and display device

A correction characteristic determining method for determining a correction characteristic in a display device which corrects an image signal constituted of three primary color signals, and displays a color image in display means in accordance with thus corrected image signal, said method comprising the steps of:

• (i) converting measured data, convertible into a tristimulus value, that indicates a result of measurement performed with respect to an emission condition of display in the display means, into brightness data of three primary colors, by using a conversion matrix;
• (ii) determining the correction characteristic in accordance with a conversion result obtained by the step (i);
• and
• (iii) generating the conversion matrix before performing the step (i), wherein
• the step (iii) includes the steps of:
• (iii-a) generating a matrix element of an inverse matrix of the conversion matrix, in accordance with measured data obtained when the display means displays highest gray scales of respective primary colors;
• (iii-b) adjusting a matrix element that has been generated by the step (iii-a) in accordance with measured data obtained when the display means displays a highest gray scale of white;
• and
• (iii-c) generating an inverse matrix of a matrix constituted of the matrix element that has been adjusted.

A display device which corrects an image signal constituted of three primary color signals, and displays a color image in display means in accordance with thus corrected image signal, a correction characteristic in said display device being determined by a correction characteristic determining method, wherein said method includes the steps of:

• (i) converting measured data, convertible into a tristimulus value, that indicates a result of measurement performed with respect to an emission condition of display in the display means, into brightness data of three primary colors, by using a conversion matrix;
• (ii) determining the correction characteristic in accordance with a conversion result obtained by the step (i);
• and
• (iii) generating the conversion matrix before performing the step (i), wherein
• the step (iii) includes the steps of:
• (iii-a) generating a matrix element of an inverse matrix of the conversion matrix, in accordance with measured data obtained when the display means displays highest gray scales of respective primary colors;
• (iii-b) adjusting a matrix element that has been generated by the step (iii-a) in accordance with measured data obtained when the display means displays a highest gray scale of white;
• and
• (iii-c) generating an inverse matrix of a matrix constituted of the matrix element that has been adjusted.

A correction characteristic determining device for determining a correction characteristic in a display device which corrects an image signal, and displays an image in display means in accordance with thus corrected image signal, said correction characteristic determining device comprising:

• target curve setting means for setting a target curve indicative of a relationship between a gray scale value of the image signal that has not been corrected and target output brightness, corresponding to the gray scale value, that should be displayed in the display means;
• gray scale adjusting means for setting an adjustment parameter by subtracting an actual brightness value, obtained when the display means displays a lowest gray scale, from lowest target output brightness corresponding to a lowest gray scale value of the image signal in the target curve, and for adjusting the target curve by subtracting the adjustment parameter from at least target output brightness in the target curve which is less than the lowest target output brightness;
• and
• gray scale value converting means for determining a relationship between the gray scale value, that has not been corrected, and the gray scale value, that has been corrected, in the image signal, in accordance with the target curve that has been adjusted by the gray scale adjusting means.

A correction characteristic determining method for determining a correction characteristic in a display device which corrects an image signal, and displays an image in display means in accordance with thus corrected image signal, said method comprising the steps of:

• (I) setting a target curve indicative of a relationship between a gray scale value of the image signal that has not been corrected and target output brightness that should be displayed in the display means;
• (II) setting an adjustment parameter by subtracting an actual brightness value, obtained when the display means displays a lowest gray scale, from lowest target output brightness corresponding to a lowest gray scale value of the image signal in the target curve, so as to adjust the target curve by subtracting the adjustment parameter from at least target output brightness in the target curve which is less than the lowest target output brightness;
• and
• (III) determining a relationship between the gray scale value, that has not been corrected, and the gray scale value, that has been corrected, in the image signal, in accordance with the target curve that has been adjusted by the step (II).

A display device which corrects an image signal, and displays an image in display means in accordance with thus corrected image signal, a correction characteristic in said display device being determined by a correction characteristic determining method, wherein said method includes the steps of:

• (I) setting a target curve indicative of a relationship between a gray scale value of the image signal that has not been corrected and target output brightness that should be displayed in the display means;
• (II) setting an adjustment parameter by subtracting an actual brightness value, obtained when the display means displays a lowest gray scale, from lowest target output brightness corresponding to a lowest gray scale value of the image signal in the target curve, so as to adjust the target curve by subtracting the adjustment parameter from at least target output brightness less than the lowest target output brightness;
• and
• (III) determining a relationship between the gray scale value, that has not been corrected, and the gray scale value, that has been corrected, in the image signal, in accordance with the target curve that has been adjusted by the step (II).