Patent ID: 9608726
Date: 2017-03-28
CPC Classifications: G09G,H04B

Claim:
1. A display device which outputs a visible light communication signal, the display device comprising: a display panel including a display screen on which an image is displayed; a display control unit configured to cause the display panel to display the image on the display screen of the display panel, based on an image signal; a backlight having a luminescence surface which illuminates the display screen of the display panel from behind the display screen; and a backlight control unit configured to divide the luminescence surface of the backlight into a plurality of areas, and, based on the image signal, (i) perform luminescence control in each of the plurality of areas and (ii) set off periods starting at different times for the plurality of areas, wherein the backlight control unit is configured to: perform luminescence control in a visible light communication area which is at least one area among the plurality of areas in a period in which the visible light communication signal is output, based on the visible light communication signal, instead of performing luminescence control based on the image signal; perform the luminescence control based on the image signal, in the visible light communication area, in a period in which the visible light communication signal is not output, and (i) in the period in which the visible light communication signal is output, the backlight control unit sequentially performs luminescence control in the plurality of areas by replacing, with the visible light communication signal, at least one of back light control signals corresponding respectively to the plurality of areas; and (ii) in the period in which the visible light communication signal is not output, the backlight control unit sequentially performs luminescence control in the plurality of areas by using the back light control signals based only on video signals.