My project board looks great in a dimly lit room, the LED's are nice and bright. In a well lit-up room though, it looks crap. I'll be putting my board in a transparent perspex case. I wonder is there any kind of layer or coating I can put on the perspex so that the LED's will look bright in daylight?
Some sort of anti-glare screen?
Started by ●April 20, 2008
Reply by ●April 20, 20082008-04-20
Tom�s � h�ilidhe wrote:> > My project board looks great in a dimly lit room, the LED's are nice > and bright. In a well lit-up room though, it looks crap. > > I'll be putting my board in a transparent perspex case. I wonder is > there any kind of layer or coating I can put on the perspex so that > the LED's will look bright in daylight?Use brighter LEDs.
Reply by ●April 20, 20082008-04-20
On Apr 20, 7:11=A0am, Tom=E1s =D3 h=C9ilidhe <t...@lavabit.com> wrote:> I'll be putting my board in a transparent perspex case. I wonder is > there any kind of layer or coating I can put on the perspex so that > the LED's will look bright in daylight?Besides using brighter LEDs and/or increasing the duty cycle (if muxed), the way one normally improves contrast is by using a dark perspex. Look at the front of an older LED sign that uses discrete LEDs and you'll see what I mean.
Reply by ●April 20, 20082008-04-20
On Sun, 20 Apr 2008 04:11:15 -0700 (PDT), the renowned Tom�s � h�ilidhe <toe@lavabit.com> wrote:> > >My project board looks great in a dimly lit room, the LED's are nice >and bright. In a well lit-up room though, it looks crap. > >I'll be putting my board in a transparent perspex case. I wonder is >there any kind of layer or coating I can put on the perspex so that >the LED's will look bright in daylight?Tinting it the same color as the LEDs can help a lot. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by ●April 20, 20082008-04-20
Tom�s � h�ilidhe wrote:> > My project board looks great in a dimly lit room, the LED's are > nice and bright. In a well lit-up room though, it looks crap. > > I'll be putting my board in a transparent perspex case. I wonder > is there any kind of layer or coating I can put on the perspex > so that the LED's will look bright in daylight?Find a suitable rheostat and put it in series with the power leads to the sun. Adjust as needed. :-) -- [mail]: Chuck F (cbfalconer at maineline dot net) [page]: <http://cbfalconer.home.att.net> Try the download section. ** Posted from http://www.teranews.com **
Reply by ●April 20, 20082008-04-20
On Apr 20, 4:21 am, Arlet Ottens <usene...@c-scape.nl> wrote:> Tom=E1s =D3 h=C9ilidhe wrote: > > > My project board looks great in a dimly lit room, the LED's are nice > > and bright. In a well lit-up room though, it looks crap. > > > I'll be putting my board in a transparent perspex case. I wonder is > > there any kind of layer or coating I can put on the perspex so that > > the LED's will look bright in daylight? > > Use brighter LEDs.Or use LCD. Reflective LCD are better for daylight and/or outdoor viewings.
Reply by ●April 20, 20082008-04-20
On Sun, 20 Apr 2008 09:17:36 -0400, CBFalconer wrote:> Tomás Ó hÉilidhe wrote: >> >> My project board looks great in a dimly lit room, the LED's are nice >> and bright. In a well lit-up room though, it looks crap. >> >> I'll be putting my board in a transparent perspex case. I wonder is >> there any kind of layer or coating I can put on the perspex so that the >> LED's will look bright in daylight? > > Find a suitable rheostat and put it in series with the power leads to > the sun. Adjust as needed. :-)You _know_ that isn't practical. Think about it -- there's an 8-minute lag for the new light level to get from the sun to you, and with a 66% velocity factor in the leads from the rheostat there's a 12-minute lag going the other way -- that's a 20 minute total lag, which is just way too long. -- Tim Wescott Control systems and communications consulting http://www.wescottdesign.com Need to learn how to apply control theory in your embedded system? "Applied Control Theory for Embedded Systems" by Tim Wescott Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
