Patent ID: 9608727
Date: 2017-03-28
CPC Classifications: H04B,H04L,H04M

Claim:
1. A transmitting method of transmitting a visible light signal by way of luminance change, the transmitting method comprising: determining a luminance change pattern to transmit the visible light signal; switching a common switch according to the luminance change pattern, the common switch being for turning ON a plurality of light sources in common, the plurality of light sources being included in a light source group of a display and each light source representing a pixel in an image; and turning ON a first pixel switch for turning ON a first light source, to cause the first light source to be ON only for a period in which the common switch is ON and the first pixel switch is ON, to transmit the visible light signal, the first light source being one of the plurality of light sources included in the light source group, wherein, in the determining, the luminance change pattern is determined for each symbol, in the turning ON of a first pixel switch, the first pixel switch is switched in synchronization with a period for transmitting the symbol, and in the turning ON of a first pixel switch, when the image is displayed on the display, the first pixel switch is switched to increase a lighting period that corresponds to the first light source, by a length of time equivalent to a period in which the first light source is OFF for transmission of the visible light signal, the lighting period being a period for representing a pixel value of a pixel in the image.