Multi-screen display system

摘要

The image update timings of a plurality of display devices are adjusted by calculating, in their image reproduction/updating control means (7), the phase difference between a synchronization adjustment signal (SAS) created from synchronization adjustment data (SAD) received from the transmitting apparatus TA by a data reception means (6) and an image display control signal (HC) output to the image display means (8), and increasing or decreasing the period of the next and subsequent image display control signals (HC) according to the phase difference, thereby reducing the phase difference. Image updating in the plurality of display devices can be synchronized to within a fixed tolerance range.

主权项

1. A multi-screen display system in which a transmitting apparatus and a plurality of display devices are interconnected via a network, wherein:
the transmitting apparatus comprises a system master clock configured to generate a reference clock time of the system, a storage unit configured to store image data, a data generation unit configured to generate reproduction control information from the reference clock time generated by the system master clock and to add the reproduction control information to image data read from the storage unit, thereby generating image data with reproduction control information, and to generate synchronization adjustment data for adjusting a reproduced image update timing from the reference clock time generated by the system master clock, and a data transmission unit configured to transmit the image data with reproduction control information and the synchronization adjustment data; each of the plurality of display devices includes a data reception unit configured to receive the image data with reproduction control information and the synchronization adjustment data transmitted from the data transmission means in the transmitting apparatus, and to generate a synchronization adjustment signal from the synchronization adjustment data, an image reproduction/updating control unit configured to perform an image reproduction/update process based on the reproduction control information included in the image data with reproduction control information received by the data reception unit, and the synchronization adjustment signal, thereby outputting a reproduced image, and to generate an image display control signal for deciding an image update timing, and an image display unit configured to display the reproduced image output from the image reproduction/updating control unit at a timing of the image display control signal; and the image reproduction/updating control unit increases and decreases subsequent periods of the image display control signal according to a phase difference between the synchronization adjustment signal output from the data reception unit and the image display control signal output to the image display unit, controlling the periods so as to reduce the phase difference, thereby synchronizing image update timings among the plurality of display devices.