ELECTRONIC DISPLAY DEVICE

摘要

In a display device (10) resembling a bottle and having electroluminescent display segments (12) resembling a spectrum analyser in the place of a label, the display segments are arranged to produce different display effects in response to differing sound levels as detected by a microphone (30). A control circuit (20) for the display segments detects an average sound level and adjusts the power supplied to the microphone in response thereto. The power supply adjustment employs a pulse width modulation technique, the duty cycle of which is varied in response to an average sound signal, averaged over a predetermined time period.