Liquid crystal display device

A liquid crystal display device comprising:

• a local dimming control circuit that outputs backlight luminance data in accordance with first-size input image data, and outputs first-size liquid crystal gradation data such that the first-size input image data is reproduced by superimposing the backlight luminance data on the first-size liquid crystal gradation data;
• a liquid crystal panel;
• a backlight in which a luminance of each region of a plurality of backlight regions is controlled in accordance with the backlight luminance data;
• at least one or more down-converters that convert second-size image data, which is larger than the first-size image data, to the first-size image data;
• a luminance ratio calculation circuit that calculates a gradation ratio by dividing the first-size liquid crystal gradation data output from the local dimming control circuit by the first-size image data output from the down-converter, each of the data corresponding to a same position on a display face;
• and
• a gradation conversion circuit that calculates second-size liquid crystal gradation data by multiplying a plurality of data, which corresponds to neighboring positions on the display face and selected from the second-size image data in accordance with a reduction rate between the second-size image data and the first-size image data by the gradation ratio at a corresponding position on the display face, wherein
• the at least one or more down-converters includes a first down-converter and a second down-converter,
• the first-size image data output from the first down-converter is supplied to the local dimming control circuit and the first-size image data output from the second down-converter is supplied to the luminance ratio calculation circuit,
• the luminance ratio calculation circuit and the gradation conversion circuit are provided in an upscaling control circuit.