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Optolite™ Backlights are available as custom
design displays. With high brightness + low current they give
even illumination.
Instrument Plastics Ltd
offer a custom service in LED backlight design with the following
benefits:
• Low cost
• High brightness
• Low current
• Even illumination
• Design flexibility
• Easy application
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Operation
The light from the LED is spread around the light
guide and directed forwards by the side reflectors and the primary
base reflector.
The primary reflector can be either white or can have an active
layer combined with a coloured filter. The active layer absorbs
and re-emits internal light and ambient light, if available.
LED Electro Optic Characteristics
Absolute Maximum Ratings
Ambient Temperature 25°C
| 221LC |
Red |
660 |
3.6 |
4.0 |
20 |
17 |
10 |
| 231HC |
Red |
635 |
4.5 |
5.5 |
20 |
8 |
10 |
| 231AC |
Amber |
610 |
3.6 |
4.0 |
20 |
8 |
10 |
| 241AC |
Yellow |
585 |
4.5 |
5.5 |
20 |
8 |
10 |
| 251PC |
Green |
570 |
4.5 |
5.5 |
20 |
12 |
10 |
| 251GC |
Green |
570 |
4.5 |
5.5 |
20 |
20 |
10 |
Application Notes
1. Low melting point solder to be used. Soldering
should be carried out at no more than 260°C. Length of time
for soldering 3 seconds @ 2mm from the reflector edge.
2. For ease of installation:
1mm diameter PCB holes are recommended.
3. Any pre forming of the leads should be carried
out before soldering.
4. Current limiting should be incorporated in the
circuit design as overdriven backlights will reduce life and reliability.
5. Cleaning of backlights should be with Isopropyl
alcohol (or equivalent).
6. Storage temperature –70°C to +85°C
Operating temperature –20°C to
+80°C
7. Thickness (typical): 3mm
8. Tolerances (typical): +/– 0.3mm overall
Possible Options
The standard design is based on a 3mm thick backlight
with an active primary reflector plus secondary side reflectors.
LEDs can be positioned on one, two, or four sides and with spacing
to suit design requirements. The most cost effective solution involves
the minimum number of LEDs per backlight required to give a specified
even illumination.
The size and colour of the LED backlights, together with the number,
colour and location of the LEDs are customer specified.
Instrument Plastics Limited has a policy of
continual improvement of products and so reserve the right to change
the product specification without notice.
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