Display apparatus, gradation correction map generating device, gradation correction map generating method, and program

A display apparatus comprising:

• an image input unit that receives an image signal;
• a display unit that includes a screen, the display unit being rotatable parallel to the screen;
• a gradation correction map generating device that generates a gradation correction map indicating a correspondence relation between a plurality of positions in the screen, and gradation correction values of the image signal at the plurality of positions;
• and
• a display control unit that corrects the image signal by using the gradation correction map,
• wherein the screen displays an image corresponding to the corrected image signal,
• the gradation correction map generating device includes:
• a rotation unevenness correction map generating unit that generates a rotation unevenness correction map indicating a correspondence relation between the plurality of positions, and correction values of brightness corresponding to a rotation angle of the display unit;
• a brightness correction map generating unit that generates a brightness correction map indicating a correspondence relation between the plurality of positions and brightness correction amounts;
• and
• a gradation correction map generating unit that generates the gradation correction map,
• the rotation unevenness correction map generating unit generates the rotation unevenness correction map based on a brightness correction map and a rotation unevenness map,
• the brightness correction map indicating a correspondence relation between the plurality of positions and uncorrected brightness values, the uncorrected brightness values being brightness values at time of performing no correction when the display unit is installed at a predetermined angle,
• the rotation unevenness map indicating a correspondence relation between the plurality of positions or other plurality of positions, and differences in brightness values corresponding to the rotation angle of the display unit, and
• the brightness correction map generating unit generates the brightness correction map based on the rotation unevenness correction map, and a specified unevenness level value,
• the gradation correction map generating unit generates the gradation correction map based on the brightness correction map and a second gamma characteristic,
• the second gamma characteristic indicating a correspondence relation between a brightness value at a specific position in the screen, and a gradation of the image signal.

A gradation correction map generating device comprising:

• a gradation correction map generating unit that generates a gradation correction map based on a brightness unevenness map, a rotation unevenness map, and a second gamma characteristic,
• the brightness unevenness map indicating a correspondence relation between a plurality of positions in a screen of a display unit, and uncorrected brightness values, the uncorrected brightness values being brightness values at time of performing no correction when the display unit is installed at a predetermined angle,
• the rotation unevenness map indicating a correspondence relation between the plurality of positions or other plurality of positions, and differences in brightness values corresponding to a rotation angle of the display unit,
• the second gamma characteristic indicating a correspondence relation between a brightness value at a specific position in the screen, and a gradation of an image signal.