Display device with variable emission luminance for individual division areas of backlight, control method of a display device, and non-transitory computer-readable medium

A control method of a display device, the display device including (a) a backlight comprising a plurality of division areas of which emission luminance is variable and (b) a display panel of which transmittance of light emitted from the backlight is variable for each pixel, the control method comprising:

• calculating emission luminance for each division areas of the backlight on the basis of input image data;
• calculating a correction value for correcting the input image data on the basis of the emission luminance;
• correcting the input image data on the basis of the calculated correction value;
• controlling the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data;
• and
• controlling light emission of each division areas of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe periods,
• wherein the emission luminance for the plurality of division areas calculated in a previous frame period is stored in a memory, and
• wherein each partial process includes a process of determining emission luminance of division areas other than the division areas for which emission luminance has been calculated before a current subframe period of a current frame period among the plurality of division areas of the backlight on the basis of the stored emission luminance calculated in the previous frame period.

A non-transitory computer-readable medium that stores a program for causing a computer to execute a control method of a display device, the display device including (a) a backlight comprising a plurality of division areas of which emission luminance is variable and (b) a display panel of which transmittance of light emitted from the backlight is variable for each pixel, the control method comprising:

• calculating emission luminance for each division areas of the backlight on the basis of input image data;
• calculating a correction value for correcting the input image data on the basis of the emission luminance;
• correcting the input image data on the basis of the calculated correction value;
• controlling the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data;
• and
• controlling light emission of each division areas of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe periods,
• wherein the emission luminance for the plurality of division areas calculated in a previous frame period is stored in a memory, and
• wherein each partial process includes a process of determining emission luminance of division areas other than the division areas for which emission luminance has been calculated before a current subframe period of a current frame period among the plurality of division areas of the backlight on the basis of the stored emission luminance calculated in the previous frame period.

A display device comprising:

• a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;
• a display panel of which transmittance of light emitted from the backlight is variable for each pixel;
• one or more memories storing instructions;
• and
• one or more processors, the one or more processors executing the instructions to:
• (1) calculate emission luminance for each division area of the backlight on the basis of input image data;
• (2) calculate a correction value for correcting the input image data on the basis of the emission luminance;
• (3) correct the input image data on the basis of the calculated correction value;
• and
• (4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period,
• wherein the input image data comprises a plurality of subframes and the input image data comprises a plurality of correction target areas, and each partial process includes a process of determining emission luminance for the division area corresponding to each subframe on the basis of image data of each subframe and calculating a correction value for correcting image data of each correction target area, and
• wherein, in each partial process, a position of the subframe and a position of the correction target area are the same.

A display device comprising:

• a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;
• a display panel of which transmittance of light emitted from the backlight is variable for each pixel;
• one or more memories storing instructions;
• and
• one or more processors, the one or more processors executing the instructions to:
• (1) calculate emission luminance for each division area of the backlight on the basis of input image data;
• (2) calculate a correction value for correcting the input image data on the basis of the emission luminance;
• (3) correct the input image data on the basis of the calculated correction value;
• and
• (4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period,
• wherein the input image data comprises a plurality of subframes and the input image data comprises a plurality of correction target areas, and each partial process includes a process of determining emission luminance for the division area corresponding to each subframe on the basis of image data of each subframe and calculating a correction value for correcting image data of each correction target area, and
• wherein, in each partial process, a position of the subframe and a position of the correction target area are different from each other.

A display device comprising:

• a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;
• a display panel of which transmittance of light emitted from the backlight is variable for each pixel;
• one or more memories storing instructions;
• and
• one or more processors, the one or more processors executing the instructions to:
• (1) calculate emission luminance for each division area of the backlight on the basis of input image data;
• (2) a correction value for correcting the input image data on the basis of the emission luminance;
• (3) correct the input image data on the basis of the calculated correction value;
• and
• (4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period,
• wherein the process of calculating the correction value for correcting the input image data on the basis of the emission luminance includes a process of estimating a luminance distribution of light from the backlight emitted to the display panel on the basis of the emission luminance, and
• wherein the input image data comprises a plurality of correction target areas, and each partial process includes a process of estimating a luminance distribution in each correction target area and a process of calculating a correction value for correcting image data of each correction target area on the basis of the estimated luminance distribution in each correction target area.

A display device comprising:

• a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;
• a display panel of which transmittance of light emitted from the backlight is variable for each pixel;
• one or more memories storing instructions;
• and
• one or more processors, the one or more processors executing the instructions to:
• (1) calculate emission luminance for each division area of the backlight on the basis of input image data;
• (2) calculate a correction value for correcting the input image data on the basis of the emission luminance;
• (3) correct the input image data on the basis of the calculated correction value;
• and
• (4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period, and
• wherein one frame period of the input image data comprises M subframe periods, and a partial process executed in an N-th (N=1 to M) subframe period among the plurality of partial processes includes a process of:
• (a) dividing the input image data into M subframes in a vertical direction and determining emission luminance of the division area corresponding to an N-th subframe from the top on the basis of image data of the N-th subframe;
• and
• (b) dividing the input image data into M correction target areas in the vertical direction and calculating a correction value for correcting image data of an N-th correction target area from the top.

A display device comprising:

• a backlight comprising a plurality of division areas of which emission luminance is variable for each division area;
• a display panel of which transmittance of light emitted from the backlight is variable for each pixel;
• one or more memories storing instructions;
• and
• one or more processors, the one or more processors executing the instructions to:
• (1) calculate emission luminance for each division area of the backlight on the basis of input image data;
• (2) calculate a correction value for correcting the input image data on the basis of the emission luminance;
• (3) correct the input image data on the basis of the calculated correction value;
• and
• (4) control the transmittance for each pixel of the display panel on the basis of corrected image data acquired through the correcting of the input image data and control light emission of each division area of the backlight on the basis of the calculated emission luminance,
• wherein a process of calculating the correction value for correcting the input image data on the basis of the emission luminance is divided into a plurality of partial processes, one frame period of the input image comprises a plurality of subframe periods, and the plurality of partial processes are sequentially performed by executing each partial process in each subframe period,
• wherein one frame period of the input image data comprises M subframe periods,
• wherein a partial process executed in an N-th (N=1 to k, 1≤k<M) subframe period among the plurality of partial processes includes a process of dividing the input image data into M subframes in a vertical direction and determining emission luminance of the division area corresponding to an N-th subframe from the top on the basis of image data of the N-th subframe, and
• wherein a partial process executed in an N-th (N=k+1 to M) subframe period among the plurality of partial processes includes a process of:
• (a) dividing the input image data into M subframes in a vertical direction and determining emission luminance of the division area corresponding to an N-th subframe from the top on the basis of image data of the N-th subframe;
• and
• (b) dividing the input image data into (M-k) (1≤ k<M) correction target areas in the vertical direction and calculating a correction value for correcting image data of an (N-k)-th correction target area from the top.