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

Claim 5:
6. An image display method for an image display system that includes 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, and 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, the image display method comprising:
respectively outputting, 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
detecting 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.