Display panel control device, liquid crystal display device, electronic apparatus, and display panel drive control device

A display panel drive control method, comprising:

• starting video display scanning and black or dark image display scanning for a display panel in a specific period, and performing black or dark image insertion drive;
• and
• controlling setting of a light-up start timing and a light-off start timing of each of a plurality of light source blocks formed on a back-face part of the display panel in parallel to a line sequential scanning direction, based on a synchronous signal that synchronizes with a timing for starting the video display scanning or a timing for starting the black or dark image display scanning performed by the black image insertion driving step, wherein
• when controlling setting of the light-up start timing and the light-off start timing of each of the plurality of light source blocks, the setting of the light-up start timing or the light-off start timing is controlled so as to satisfy a period condition, −4:e-w., wherein a light-off period of a given light source block becomes equal to or less than a period from an end of the black or dark image display scanning on all display lines within a block area of the display panel corresponding to the given light source block to a start of the video scanning on a first display line within the block area, wherein,
• provided that the driven line number of the display panel is “Vtotal”, scanning line number that is display line number of the display panel is “Vdisp”, dividing number of the divided light source blocks is “N”, a black image insertion rate in a frame period by the black image insertion driving part is “Xp”, and a light-off rate that is a ratio of the light-off period in the frame period is “Xb”, the light-up timing control part performs controls based on the light-off period and the number of blocks set according to the black image insertion rate, by satisfying a co-relational condition between the black image insertion rate Xp and the light-off rate Xb expressed as follows:
• Xb≦Xp−(Vdisp/N)/Vtotal.

Display panel control means for controlling a display panel and a back-face light source which configures a plurality of light source blocks formed on a back face of the display panel in parallel to a line sequential scanning direction, the control means comprising:

• black image insertion driving means for starting video display scanning and black or dark image display scanning for the display panel in a specific period, and performing black or dark image insertion drive;
• and
• light-up timing control means for controlling setting of a light-up start timing and a light-off start timing of each of the plurality of light source blocks, based on a synchronous signal that synchronizes with a timing for starting the video display scanning or a timing for starting black or dark image display scanning performed by the black image insertion means, wherein
• the light-up timing control means controls the setting of the light-up start timing or the light-off start timing so as to satisfy a period condition wherein a light-off period of a given light source block becomes equal to or less than a period from an end of the black or dark image display scanning on all display lines within a block area of the display panel corresponding to a given light source block to a start of the video scanning on the first display line within the block area, wherein,
• provided that driven line number of the display panel is “Vtotal”, scanning line number that is display line number of the display panel is “Vdisp”, dividing number of the divided light source blocks is “N”, a black image insertion rate in a frame period by the black image insertion driving means is “Xp”, and a light-off rate that is a ratio of the light-off period in the frame period is “Xb”, the light-up timing control means perform controls based on the light-off period and the number of blocks set according to the black image insertion rate, by satisfying a co-relational condition between the black image insertion rate Xp and the light-off rate Xb expressed as follows:
• Xb≦Xp−(Vdisp/N)/Vtotal.