| 摘要 |
Means (26) for use on or in a vehicle are adapted to provide a programmed or programmable display (38) for security use and/or for display to persons outside the vehicle and may comprise a vehicle windscreen, window or registration number plate (28), part or all of which is programmable to be substantially transparent and alternatively at least partially opaque and/or may comprise a vehicle registration number plate (28) with a programmed or programmable display (38), e.g. provided by appropriate display means (34), e.g. liquid crystal, e.g. with a lambertian light source (36) arranged to provide back illumination therefor. The programmable or programmed display (38) may be characteristic of the vehicle being stolen or otherwise in an unauthorised state, e.g. by being opaque or exhibiting the word "STOLEN" (38) and/or it may show the vehicle registration number (381), e.g. alternately. It may respond to an authorisation signal (48), e.g. coded, to prevent or suppress exhibition of the unauthorised state display (38), or respond to a vehicle ignition detection signal (50) and the absence of an authorisation signal (48) to enable exhibition of the unauthorised state display (38), or enable exhibition of the unauthorised state display (38) only above a predetermined threshold speed of the vehicle. |
