Thomson Licensing S.a.

Sean Patrick McPeak

John Barrett George

Angela Renee Burnett

Gautam Nath

Joseph Curt Stevens

Rick Carl Allen

A method of operating a photo sensor in a projection display device comprises the steps of, illuminating the sensor with a projected image. Detecting a signal from the sensor responsive to the illumination by the projected image. Changing a threshold value of the detector until the signal detection ceases. Storing a value representative of the threshold value which terminated detection of the signal from the sensor.

Automated calibration in a projection display apparatus

A power supply operates in a run mode of operation and in a stand-by, burst mode of operation. When, for example, a user initiates a power-on request command, an on/off control signal is applied to an input terminal of a microprocessor. The microprocessor monitors an end time of a dead time interval of a burst mode cycle and generates a synchronized control signal for turning on a switch. The switch turns on immediately after the end of the dead time interval. The turned on switch couples a run mode load to a filter capacitor of the power supply.

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Indianapolis, IN, United States of America

Sean Patrick McPeak