Liquid crystal display device, signal processing unit for use in liquid crystal display device, program and storage medium thereof, and liquid crystal display control method

A signal processing unit for use in a liquid crystal display device, the signal processing unit comprising:

• a conversion section which converts an interlaced video signal into a progressive video signal;
• and
• a correction section which corrects a video signal of current vertical period so as to emphasize grayscale transition at least from previous vertical period to current vertical period in the progressive video signal,
• wherein
• the conversion section is capable of conversions by two or more conversion methods,
• a degree of the grayscale transition emphasis performed by the correction section is changed in accordance with which conversion method among the two or more conversion methods is used by the conversion section,
• the two or more conversion methods include a first conversion method of referencing to a video signal of other field for conversion and a second conversion method of not referencing to a video signal of other field for conversion, and
• in a case where the conversion section performs conversion by the second conversion method, a degree of grayscale transition emphasis performed by the correction section is changed to be lower than in a case where the conversion section performs conversion by the first conversion method.