| 摘要 |
<p>A projection system having a projection display ( 20 ), at least one light source ( 10 ), and a sensor means for sensing and compensating for changes in the luminous flux emitted by the at least one light source ( 10 ) is described. The sensor means comprises in this case at least one sensor arrangement ( 30; 31, 32; 33, 34 ) for sensing components (M) of the light from the light source ( 10 ) that are directed into a region surrounding an entering face of an optical component ( 11 ) of the projection system. It has been found that there is a very good correlation between these components (M) of the light from the light source ( 10 ) and those other components (I) of the light that actually reach the projection display ( 20 ), which means that by controlling a power supply unit ( 10 c) for the light source ( 10 ) and/or a driver unit ( 20 a) driving the projection display ( 20 ) in a suitable manner it is possible very effectively to suppress fluctuations in brightness that occur as a result of, for example, unstable arc discharges.</p> |
