A display device comprising: a display; a memory; and a processor configured to control the display to display an output image including video content and a plurality of graphic objects, wherein the processor is configured to: obtain a video image by processing input video content, obtain a plurality of graphic images including each of the plurality of graphic objects by processing each of the plurality of graphic objects in parallel, and obtain the output image by mixing the obtained video image and the obtained plurality of graphic images, characterised in that the processor is configured to obtain the plurality of graphic images by: writing a first graphic image having a first resolution, to the memory at a frequency lower than an output frequency of the display, the first graphic image being a background image, writing a second graphic image having a second resolution lower than the first resolution, to the memory at a same frequency as the output frequency of the display, reading the first and second graphic images from the memory at a same frequency as the output frequency of the display, and upscaling the second graphic image to increase its resolution from the second resolution to the first resolution such that the obtained first graphic image and second graphic image both have the first resolution. a display; a memory; and a processor configured to control the display to display an output image including video content and a plurality of graphic objects, wherein the processor is configured to: obtain a video image by processing input video content, obtain a plurality of graphic images including each of the plurality of graphic objects by processing each of the plurality of graphic objects in parallel, and obtain the output image by mixing the obtained video image and the obtained plurality of graphic images, characterised in that the processor is configured to obtain the plurality of graphic images by: writing a first graphic image having a first resolution, to the memory at a frequency lower than an output frequency of the display, the first graphic image being a background image, writing a second graphic image having a second resolution lower than the first resolution, to the memory at a same frequency as the output frequency of the display, reading the first and second graphic images from the memory at a same frequency as the output frequency of the display, and upscaling the second graphic image to increase its resolution from the second resolution to the first resolution such that the obtained first graphic image and second graphic image both have the first resolution. obtain a video image by processing input video content, obtain a plurality of graphic images including each of the plurality of graphic objects by processing each of the plurality of graphic objects in parallel, and obtain the output image by mixing the obtained video image and the obtained plurality of graphic images, characterised in that the processor is configured to obtain the plurality of graphic images by: writing a first graphic image having a first resolution, to the memory at a frequency lower than an output frequency of the display, the first graphic image being a background image, writing a second graphic image having a second resolution lower than the first resolution, to the memory at a same frequency as the output frequency of the display, reading the first and second graphic images from the memory at a same frequency as the output frequency of the display, and upscaling the second graphic image to increase its resolution from the second resolution to the first resolution such that the obtained first graphic image and second graphic image both have the first resolution. writing a first graphic image having a first resolution, to the memory at a frequency lower than an output frequency of the display, the first graphic image being a background image, writing a second graphic image having a second resolution lower than the first resolution, to the memory at a same frequency as the output frequency of the display, reading the first and second graphic images from the memory at a same frequency as the output frequency of the display, and upscaling the second graphic image to increase its resolution from the second resolution to the first resolution such that the obtained first graphic image and second graphic image both have the first resolution.