Image display device, control method therefor, and image display system

A control method for an image display device which includes a backlight having a plurality of light emitting blocks, and a display panel to display an image based on image data which is inputted thereto, by changing a transmissivity thereof for light irradiated from the backlight for each pixel in accordance with the inputted image data,

• said control method comprising:
• a panel measured value obtaining step to obtain measured values of the brightness and chromaticity of said display panel;
• a calibration step to carry out calibration of said display panel based on said obtained measured values;
• a temperature obtaining step to obtain individual temperature values of said plurality of light emitting blocks;
• a specifying step to specify a light emitting block of which the magnitude of a change in temperature within a predetermined period of time is smaller than a threshold value;
• a setting step to set a patch image display area for displaying a patch image for calibration in a region of the display panel corresponding to said specified light emitting block;
• and
• a generation step to generate the patch image to be displayed in said set patch image display area;
• wherein in said calibration step, the calibration is carried out based on the measured values obtained by said panel measured value obtaining step in a case where the patch image generated in said generation step is displayed in the patch image display area set in said setting step.

An image display system comprising:

• an image display device;
• and
• a calibration device to carry out calibration of the image display device;
• wherein said image display device comprises:
• a backlight having a plurality of light emitting blocks;
• a display panel to display an image based on image data which is inputted thereto, by changing a transmissivity thereof for light irradiated from the backlight for each pixel in accordance with the inputted image data;
• and
• a second measuring unit which measures individual temperature values of said plurality of light emitting blocks;
• wherein said calibration device comprises:
• a first measuring unit which measures the brightness and chromaticity of said display panel;
• a calibration unit which carries out calibration of said display panel based on a result of measurement performed by said first measuring unit;
• a specifying unit which controls said second measuring unit so as to measure the individual temperature values of said plurality of light emitting blocks in a predetermined period of time, obtains a result of the measurement by said second measuring unit in the predetermined period of time, and specifies a light emitting block of which the magnitude of a change in temperature within the predetermined period of time is smaller than a threshold value;
• a setting unit which sets a patch image display area for displaying a patch image for calibration in a region of the display panel corresponding to the light emitting block specified by said specifying unit;
• and
• a generation unit which generates the patch image to be displayed in the patch image display area set by said setting unit;
• wherein said calibration unit carries out the calibration based on the result of the measurement by said first measuring unit in a case where the patch image generated by said generation unit is displayed in the patch image display area set by said setting unit.

An image display device comprising:

• a backlight having a plurality of light emitting blocks;
• a display panel to display an image based on image data which is inputted thereto, by changing a transmissivity thereof for light irradiated from the backlight for each pixel in accordance with the inputted image data;
• a plurality of second measuring units which measures individual temperature values at a plurality of positions in said backlight;
• a setting unit which sets a patch image display area for displaying a patch image for calibration based on a result of measurement performed by said plurality of second measuring units;
• a generation unit which generates the patch image to be displayed in the patch image display area set by said setting unit;
• and
• a calibration unit which carries out calibration of said display panel based on a result of measurement performed by a first measuring unit which measures the brightness and or chromaticity of said display panel in a case where the patch image generated by said generation unit is displayed in said display panel.

A control method for an image display device which includes a backlight having a plurality of light emitting blocks, and a display panel to display an image based on image data which is inputted thereto, by changing a transmissivity thereof for light irradiated from the backlight for each pixel in accordance with the inputted image data,

• said control method comprising:
• obtaining individual temperature values at a plurality of positions in said backlight measured by a plurality of second measuring units;
• setting a patch image display area for displaying a patch image for calibration based on said obtained measured temperature values;
• generating the patch image to be displayed in said patch image display area set in said setting;
• and
• calibrating said display panel based on measured values of the brightness or chromaticity of said display panel measured by a first measuring unit in a case where the patch image generated in said generating is displayed in said display panel.