Patent ID: 11948522
Assignee: JAPAN DISPLAY INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G

Claim 5:
6. A display device comprising:
an image display panel having an image display surface on which display is to be controlled based on an image signal;
a light source device that comprises a plurality of light sources provided corresponding to a plurality of divided partial areas of the image display surface, and is configured to illuminate the image display surface; and
a signal processor configured to calculate a light quantity of each light source for each of the partial areas, wherein
the signal processor is configured to calculate the light quantity for each partial area based on the image signal, set one of the partial areas as an adjustment target partial area for the light quantity, and adjust the light quantity in the adjustment target partial area when a difference value obtained by subtracting the light quantity of an adjacent partial area located around the adjustment target partial area from the light quantity of the adjustment target partial area is equal to or greater than a predetermined value,
the signal processor is configured to
sequentially select each of the divided partial areas of the image display surface to set the selected one of the divided partial areas as the adjustment target partial area for the light quantity,
sequentially select each of a plurality of the adjacent partial areas for the selected one of the divided partial areas,
determine whether any unselected adjacent partial area is present for the selected divided partial area,
select, when any unselected adjacent partial area is present, an unselected adjacent partial area of the adjacent partial areas, and
select, when no unselected adjacent partial area is present, an unselected divided partial area as a new adjustment target partial area, and

the signal processor is configured to reduce an adjustment coefficient only as a value of brightness of the image signal corresponding to the adjustment target partial area increases.