An organic EL device which contains an anode, a cathode, and at least one organic thin-film layer including a light emitting layer which contains a compound represented by the following general formula : . In every PWM cycle, a built-in feedback voltage samples and holds a flyback voltage from the auxiliary winding of the transformer via a sampling switch and generates a feedback voltage accordingly. The document is converted to executable code. The stress value corresponding to the collision ratio is stored time-serially. The retaining structure is positioned on the cap above the filter and may be used to contain the filter within the cap.