Large Area Type
Alternatives
Array Type
Backlights are positioned behind objects...
Backlights are positioned behind objects to create a silhouette. This technique is excellent for creating contrast on edges, detection of holes or voids in an object or to separate transparent from opaque.
Large area type backlights use LED’s directly behind the diffuser the same as array type backlights and therefore have similar intensity and uniformity characteristics (very high intensity and typical uniformity of +/- 10%). Large area backlights have to be constructed with great care regarding thermal management and uniformity. Excessive heat can be generated at the centre of large arrays of LEDs. Transferring this heat efficiently is a priority in the design.
Large area backlights can often be positioned at greater distances behind objects, whilst maintaining coverage – this technique offers much improved performance when compared to working at close distances.
Key features
- Available in a wide range of colours including White, Red, Green, Blue, IR and UV.
- Intensity controlled via voltage or constant current.
- Continuous output and strobe versions
- Fast on/off response (nanoseconds for some models)
- Long life expectancy up to 100k hours
- Many accessories available including power supplies, various non-standard diffusers and light control film.
Accessories
- Fixed power supplies for constant voltage models
- Intensity controllable power supplies (variable voltage type)
- Intensity controllable power supplies (variable current type)
- Intensity controllable power supplies (Pulse width type)
- Strobe power supplies
- Diffusers (with different transmissions)
- Light control film for pseudo collimation
*Specifications are subject to change without notice
