Patent ID: 7106294
Filing Date: 2006-09-12
Classification: G09G

Abstract:
1. A liquid crystal display device for displaying images by irradiating a liquid crystal panel, which is driven in response to video signals, with light outputted from a backlight device, the liquid crystal display device comprising: drive means for driving the liquid crystal panel in response to the video signals such that one frame period is divided into a black display period and an image display period; a PWM dimming signal generation circuit for generating a PWM dimming signal for controlling the backlight device by a PWM dimming technique; a lighting circuit for driving the backlight device in response to the PWM dimming signal; and means for controlling a cycle and/or phase of the PWM dimming signal to prevent an occurrence of interference fringes in the liquid crystal panel, caused by the PWM dimming technique, wherein a PWM dimming frequency f (Hz) in the PWM technique and a ratio B (%) of the black display period to one frame period satisfy the relationship f≧25B+250.