Patent ID: 9142166
Filing Date: 2015-09-22
Classification: G09G

Abstract:
1. A liquid crystal display device having a backlight device controlling illuminating a back surface of a liquid crystal panel for each area by a plurality of light sources, an intermittent lighting control portion executing an intermittent lighting process for allowing a continuous light-on and a continuous light-off of each of the light sources at a predetermined ratio within one video frame period, and an ambient illuminance detection portion detecting an ambient illuminance of the liquid crystal display device, comprising: a drive current control portion that changes a luminous intensity of the backlight device in conjunction with the level of the ambient illuminance by changing a drive current supplied to the light sources depending on an ambient illuminance detected by the ambient illuminance detection portion and on the execution or nonexecution of the intermittent lighting process by the intermittent lighting control portion, and an intermittent lighting switching portion that causes the intermittent lighting control portion to execute the intermittent lighting process if the ambient illuminance detected by the ambient illuminance detection portion is less than a first predetermined illuminance that is previously set, and causes the intermittent lighting control portion to stop the intermittent lighting process for allowing continuous light-on of each of the light sources if the ambient illuminance is not less than the first predetermined illuminance and is not less than a second predetermined illuminance that is previously set.