| 摘要 |
The field of the invention is that of light boxes used for illuminating optical-valve displays, especially matrix liquid-crystal displays (or LCDs). The illumination from light boxes can at the present time be produced by light-emitting diodes that emit in various spectral bands so as to reconstruct white illumination. For a number of applications, in particular aeronautical applications, it is necessary to maintain the photometric and calorimetric characteristics of this illumination independently of the environmental and ageing conditions of the components. The invention provides an electronic feedback control device for maintaining the photometric and calorimetric characteristics of this illumination at given setpoint values without introducing disturbing optoelectronic devices into the light box. Several possible technical solutions are described.
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