LED Matrix display in daylight

[FlipFlop]

Hi,

I want to buy a dot matrix display for my LCD project, The display must be BIG and Must to be seen in daylight.

I found a BIG display and my question is if the LEDs will be seen in daylight.
every LED is 9.6mcd.

http://optoelectronics.liteon.com/en-us/api/DwonloadFileHandler.ashx?txtSpecNo=DS-30-94-191&txtPartNo=LTP-4157AHR

Does it strong enough to be seen in daylight?? if not what mcd recomended for LED displays in daylight??


Thank you.:thumbsup:

 

[Steve K]

You can ask Lite-On:

"Please contact us for LED products technical support and RoHS survey support.

Main Office
720 South Hillview Drive
Milpitas, CA 95035
Tel: 408.946.4873

Texas
1817 W Braker Lane, Suite 100
Austin, TX 78758
Tel: 512.691.3343 or 512.691.3348 "

regards,
Steve K.

edit: looking at the datasheet, it appears that the recommended current is 25mA. Seems very unlikely that this would be visible in daylight.

 

[FlipFlop]

Basically what is the mcd that required for LEDs display to be seen in daylight?

 

[idlplumb]

Basically what is the mcd that required for LEDs display to be seen in daylight?

I think it's not going to have so much to do with the brightness, but how it is set up. If each LED has a small "shroud", I think it will make it more visible since it will cut out ambient light and make the actual LED more visible.

 

[Steve K]

having the leds set against a black background does make a difference, at least for the traffic lights that I see. I can't imagine they would show up so well if it weren't for the high contrast of the black face of the traffic light fixture.

I've got some 5mm red leds that I use in a bicycle taillight. They were pretty leading edge stuff when I bought them 6 or 7 years ago. Don't recall the mcd rating, but I want to say they were at least a few thousand mcd. They are visible in the daylight, but not bright. I'd suggest either buying a few different leds and try them out, or do some searches for daylight visible leds and see what pops up.

There's also the issue of viewing angle; i.e. how far off of the main axis do you want this to be visible? The wider the viewing angle, the more power you'll need. ...or conversely, for a given power, the wider the viewing angle, the lower the intensity (as measured in mcd).

regards,

Steve K.

 

[FlipFlop]

Thank you for your answers/

but I need to know what is the recommended mcd for LED in daylight???, for searching another display