| 摘要 |
PROBLEM TO BE SOLVED: To vary the lightness of a display panel with respect to external dimming signal in a linear relation. SOLUTION: A display control circuit is equipped with a vertical timing control circuit 11 which generates start signals STHA and STHB; panel drive parts YD and XD which drive a plurality of OCB liquid crystal pixels PX sequentially, in units of the prescribed number of lines under the control of the signal STHA to make the pixels PX in drive lines hold a pixel voltage for gray level display and which drive the pixels PX together, in units of prescribed number of lines under the control of the signal STHB signal to make the pixels PX in drive lines hold a pixel voltage for black insertion; and light source drive parts 14, 15, and LD which drive a plurality of backlight sources LD nearly parallel to the lines of the pixels PX. The light source drive parts 14, 15, and LD, in particular, are configured to start making a plurality of light sources BL blink in order at a prescribed duty ratio, in synchronism with the signal STHA, and the prescribed duty ratio is determined according to the external dimming signal DIM so as not to exceed the ratio of a hold period of the pixel voltage for gray level display to the total period of a hold period of the pixel voltage for gray level display and the holding period of the pixel voltage for black insertion at the maximum value of the prescribed duty ratio. COPYRIGHT: (C)2006,JPO&NCIPI
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