Video display device and video data transmission method
A display includes eight modules. A relay group includes eight relays provided for the respective modules. Each relay includes: a buffer; a memory writer for writing video data into the buffer; and a memory reader that, after the memory writer completes writing, reads the video data from the buffer at a speed lower than a speed of the writing and outputs the read video data to the corresponding module. A video data supplier sequentially sorts the video data to the eight relays in such a manner that, per line of line data, the line data from the buffer of one relay of the eight relays is read during a writing period of the line data to buffers of the other seven relays.
1. A video display device, comprising:
a display comprising at least three modules, each of the modules displaying an image corresponding to video data input from an outside of the video display device;
a relay group disposed on a transmission path of the video data leading to the display, the relay group causing reduction in a transmission rate of the video data; and
a video data supplier to supply the video data to the relay group,
wherein
the relay group comprises at least three relays that are provided for the respective modules,
each of the relays comprises
a plurality of partial buffers to store the video data,
a memory writer to write, to each of the partial buffers, division data that is the video data for less than one module within one frame, supplied from the video data supplier and to switch, every time the division data is provided from the video data supplier, a partial buffer on which writing is performed among the partial buffers, and
a memory reader that, after the memory writer completes the writing, reads the division data from the partial buffer at a speed lower than a speed of the writing and outputs the read division data to the corresponding module, and has a reading period for reading the division data from one partial buffer of the partial buffers, the reading period having an overlap with a writing period for writing the division data to another partial buffer of the partial buffers, and
the video data supplier sequentially sorts the video data into the relays on a multi-division data basis such that reading of the division data from the partial buffer in one relay of the relays is performed during a writing period for writing the division data to the partial buffers of each of remaining relays of the relays.
2. The video display device according to claim 1 , wherein
each of the relays includes a transmission cable through which the division data output by the memory reader is transmitted to the corresponding module, and
the display includes a display area having a shape whose longitudinal direction is one direction as viewed from in front of the display, and has a structure in which the modules are coupled together in a traverse direction that is orthogonal to the longitudinal direction.
3. The video display device according to claim 1 ,
wherein the division data is the video data of one line or less within one frame.
4. The video display device according to claim 1 ,
wherein each of the relays reduces a transmission rate of the video data to 1/(L−1) or less where the number of the relays that constitute the relay group is L.
5. The video display device according to claim 1 ,
wherein each of the relays further comprises a second buffer to temporarily store the division data output by the memory reader.
6. A method for transmitting video data, the method comprising:
sequentially sorting the video data into at least three relays provided to respective at least three modules, the modules forming one common display, each of the modules displaying an image corresponding to the video data input from an outside and writing the video data to a plurality of partial buffers provided to the respective relays; and
reading division data from a partial buffer of the partial buffers to which the division data is written at a speed lower than a speed of writing the division data by performing the reading during a writing period for writing the division data to each of remaining partial buffers of
the partial buffers, and transmitting the read division data to the corresponding module, wherein in the writing of the video data, switching of a sorting destination of the video data from the one relay to the remaining relays is performed on a multi-division data basis.