Display device and display method
A display device of the present disclosure is a display device capable of outputting, by a Carousel method, a visible light communication signal including a plurality of signal units. The display device includes a display panel that displays a video signal, a visible light communication processor that encodes the signal units, divides the encoded signal units into a plurality of blocks, generates a plurality of transmission frames by using the plurality of blocks, and uses the generated transmission frames as a backlight control signal, and a backlight that illuminates the display panel from the back surface of the display panel based on the backlight control signal. With regard to the plurality of transmission frames corresponding to one of the signal units generated by the visible light communication processor, an order of the plurality of blocks is different between at least two of the transmission frames.
1. A display device configured to output, by a Carousel method, a visible light communication signal including a plurality of signal units, the display device comprising:
a display panel configured to display a video signal;
a visible light communication processor configured to encode the signal units, divide each of the encoded signal units into a plurality of blocks, generate a plurality of transmission frames by using the plurality of blocks, and use the generated transmission frames as a backlight control signal; and
a backlight configured to illuminate the display panel from a back surface of the display panel based on the backlight control signal, wherein
in the plurality of transmission frames generated by the visible light communication processor and corresponding to one of the signal units, an order of blocks is different in at least two of the transmission frames,
the plurality of transmission frames generated by the visible light communication processor and corresponding to the one signal unit include:
an identical block in at least two transmission frames that are adjacent in time, and
a plurality of identical blocks in at least one of the transmission frames, and
the plurality of transmission frames corresponding to the one signal unit include all of the plurality of blocks.
2. The display device according to claim 1 ,
wherein the visible light communication processor detects a region of the display panel, the region having predetermined brightness or more, and in response to a size of the region, decides a number of the identical blocks to be included in the at least one of the transmission frames, and generates the plurality of transmission frames corresponding to the one signal unit.
3. The display device according to claim 1 , wherein, in response to a distance between the display panel and a receiver configured to receive the output visible light communication signal, the visible light communication processor decides a number of the identical blocks to be included in the at least one of the transmission frames, and generates the plurality of transmission frames corresponding to the one signal unit.
4. The display device according to claim 1 , wherein the visible light communication signal processor inserts a reset signal between two adjacent signal units among the signal units.
5. The display device according to claim 1 , wherein the visible light communication processor inserts a blank into at least one transmission frame among the plurality of transmission frames corresponding to the one signal unit.
6. The display device according to claim 1 , wherein
the plurality of transmission frames generated by the visible light communication processor and corresponding to the one signal unit include a plurality of first identical blocks in a first transmission frame and a plurality of second identical blocks in a second transmission frame, the first identical blocks being different from the second identical blocks.
7. A display method configured to output, by a Carousel method, a visible light communication signal including a plurality of signal units, the display method comprising:
a first step of encoding the signal units, dividing each of the encoded signal units into a plurality of blocks, generating a plurality of transmission frames by using the plurality of blocks, the transmission frames being output by the Carousel method, and outputting the generated transmission frames as a backlight control signal; and
a second step of controlling a backlight based on the backlight control signal, wherein
in the plurality of transmission frames generated in the first step and corresponding to one of the signal units, an order of blocks is different in at least two of the transmission frames,
the plurality of transmission frames generated in the first step and corresponding to the one signal unit include:
an identical block in at least two transmission frames that are adjacent in time, and
a plurality of identical blocks in at least one of the transmission frames, and
the plurality of transmission frames corresponding to the one signal unit include all of the plurality of blocks.