Patent ID: 11972706
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 0:
1. An image display system comprising:
a plurality of semiconductor light sources that drive semiconductor light source elements to respectively output a plurality of optical signals respectively including a plurality of modulated signal portions at timings different from each other;
a plurality of optical fiber cables that are respectively connected to the plurality of semiconductor light sources, and respectively transmit the plurality of optical signals;
a light synthesizer that synthesizes the plurality of optical signals respectively output from the plurality of optical fiber cables, to output a synthesized optical signal;
a light amount detector that detects an output light amount of the synthesized optical signal from the light synthesizer;
a modulated signal detector that performs filter processing to remove a DC component of the detected output light amount from the output light amount of the synthesized optical signal and detects the plurality of modulated signal portions;
an image modulator that modulates the synthesized optical signal from the light synthesizer according to an input image signal to output a modulated image light; and
a light source controller that respectively outputs, to the plurality of semiconductor light sources, a plurality of drive control signals for respectively outputting the plurality of optical signals respectively including the plurality of modulated signal portions according to the image signal, and detects a failure of the plurality of optical fiber cables based on whether or not a modulated signal portion among the plurality of modulated signal portions is detected.