Image display system, image display apparatus and calibration method
First Claim
1. An image display apparatus having a display panel, and a backlight adapted to be changed over among a plurality of levels of luminance, said apparatus comprising:
- a setting unit that sets a target value for a predetermined display characteristic of said image display apparatus;
a decision unit that decides, based on a continuous range of contrast ratios determined by said target value, a discrete number of levels of change-over of the luminance of said backlight; and
a calibration unit that carries out color measurement by causing said backlight to emit light at each level of luminance decided by said decision unit and causing said image display apparatus to display a predetermined color chart thereon at each level of luminance of said backlight, and carries out calibration at each level of luminance of said backlight based on a color value measured by the color measurement, the color measurement and the calibration being repeatedly carried out the number of times corresponding to the number of levels of the luminance of said backlight decided by said decision unit.
1 Assignment
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Accused Products
Abstract
A target value of a contrast ratio of an image display apparatus is set, and the number of levels, among which the luminance of a backlight is changed over, and each level of luminance are decided according to the target value of the contrast ratio. The backlight is made to emit light at the individual levels of luminance of the backlight thus decided, and at the same time, the image display apparatus is made to display a predetermined color chart thereon, so that color measurement is thereby carried out, and calibration is carried out at each level of luminance of the backlight based on a color value thus measured. The calibration is carried out only on an appropriate number of levels of the luminance of the backlight required to achieve the target value of the contrast ratio.
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Citations
20 Claims
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1. An image display apparatus having a display panel, and a backlight adapted to be changed over among a plurality of levels of luminance, said apparatus comprising:
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a setting unit that sets a target value for a predetermined display characteristic of said image display apparatus; a decision unit that decides, based on a continuous range of contrast ratios determined by said target value, a discrete number of levels of change-over of the luminance of said backlight; and a calibration unit that carries out color measurement by causing said backlight to emit light at each level of luminance decided by said decision unit and causing said image display apparatus to display a predetermined color chart thereon at each level of luminance of said backlight, and carries out calibration at each level of luminance of said backlight based on a color value measured by the color measurement, the color measurement and the calibration being repeatedly carried out the number of times corresponding to the number of levels of the luminance of said backlight decided by said decision unit. - View Dependent Claims (2, 3, 4, 5, 6, 20)
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7. A calibration method for an image display apparatus having a display panel and a backlight adapted to be changed over among a plurality of levels of luminance, said method comprises:
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a setting step to set a target value for a predetermined display characteristic of said image display apparatus; a decision step to decide, based on a continuous range of contrast ratios determined by said target value, a discrete number of levels of change-over of the luminance of said backlight; and a calibration step to carry out color measurement by causing said backlight to emit light at each level of luminance decided in said decision step and causing said image display apparatus to display a predetermined color chart thereon at each level of luminance of said backlight, and to carry out calibration at each level of luminance of said backlight based on a color value measured by the color measurement, the color measurement and the calibration being repeatedly carried out the number of times corresponding to the number of levels of the luminance of said backlight decided by said decision unit. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An image display system which is provided with an image display apparatus having a display panel and a backlight adapted to be changed over among a plurality of levels of luminance, and a calibration device that carries out color measurement by causing said image display apparatus to display a predetermined color chart thereon, and carries out calibration of said image display apparatus based on a color value thus measured,
wherein said calibration device comprises: -
a setting unit that sets a target value for a predetermined display characteristic of said image display apparatus; a target value transmission unit that transmits said target value to said image display apparatus; a luminance level obtaining unit that obtains, from said image display apparatus, information on the number of levels of change-over of the luminance of said backlight decided based on said target value; and a calibration unit that carries out color measurement by causing said backlight to emit light at each level of the luminance obtained by said luminance level obtaining unit and causing said image display apparatus to display a predetermined color chart thereon at each level of luminance of said backlight, and carries out calibration at each level of the luminance of said backlight based on a color value measured by the color measurement, the color measurement and the calibration being repeatedly carried out the number of times corresponding to the number of levels of the luminance of said backlight obtained by said luminance level obtaining unit; wherein said image display apparatus comprises; a target value obtaining unit that obtains said target value for the predetermined display characteristic from said calibration device; a decision unit that decides, based on a continuous range of contrast ratios determined by said target value, a discrete number of levels of change-over of the luminance of said backlight; and a luminance level transmission unit that transmits information on said number of levels decided by said decision unit to said calibration device. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification