Backlighting Options - Esterline Interface Technologies - #4

As the leader in custom input integration, Advanced Input Systems can adapt cutting-edge backlighting

innovations to create or to enhance a custom solution

for your unique requirement.

• Tolerances between individual parts can become noticeable in large groupings or arrays of LEDs.

Light bars consist of an opaque plastic case around an epoxy encapsulated LED lamp. The LED is tinted to match the color of the emitted light. The top surface of a light bar is exceptionally uniform in light emission, and the plastic case eliminates light leakage from the sides of the device. Light bars provide improved diffusion over

individual LEDs.

Light bars are designed for applications where a large, bright source of light is required. Such light bars are configured in single-in-line and dual-in-line packages that contain either single or segmented light emitting areas. The plastic bezel firmly mounts light bars in a panel and holds legends for front panel or PC board applications.

Light bars allow lighting of a specific area and are an innovative solution to fixed message annunciation. The large, uniformly illuminated light emitting from the surface of the light bar may be used for backlighting legends or simple indicators. Multiple emitting surfaces

are available.

Light bars provide exceptional brightness at very low drive currents. They are perfect for applications where portability and battery backup are important. Choice of colors for light bars is categorized for light output and dominant wavelength. This backlighting technology provides good legend and color separation. Light bars can, however, limit the size and extent of

backlighting options.

Due to size constraints, light bars are most often used for illumination of discrete legends and not keypads in general. When used in Flat Panel Dome or Flat Panel products, light bars must be mounted on a separate circuit card layer, often increasing product cost.

• Mechanical size limits design options.

• Used where uniform intensity on relatively large legends is required.

• Through-hole solder design precludes most automated assembly methods.

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