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<p>You could consider a plain grey polarizing film instead of colour filters. The polarization should significantly reduce reflections and hence improve the contrast of the display. To be really slick, an antireflective coating on top would be nice. But maybe
not necessary unless you want sunlight readable.</p>
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<div id="Signature">Colin Isenman cisenman@hotmail.com </div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> chchrobotics-bounces@lists.linuxnut.co.nz <chchrobotics-bounces@lists.linuxnut.co.nz> on behalf of Peter Ellens <ellensp@gmail.com><br>
<b>Sent:</b> Friday, 13 January 2017 9:26 p.m.<br>
<b>To:</b> Christchurch Robotics<br>
<b>Subject:</b> Re: [chbot] LED displays coloured filters</font>
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<div class="PlainText">something like <br>
<a href="https://www.aliexpress.com/item/Hot-12pcs-Colorful-Strobist-Flash-Color-Lighting-Gel-Pop-Up-Filter-Diffuser-Lighting-for-Lighting-Effects/32457417936.html" id="LPlnk253039" previewremoved="true">https://www.aliexpress.com/item/Hot-12pcs-Colorful-Strobist-Flash-Color-Lighting-Gel-Pop-Up-Filter-Diffuser-Lighting-for-Lighting-Effects/32457417936.html</a>
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On 13/01/17 20:21, Volker Kuhlmann wrote:<br>
> It has become obvious with my display experiments that the appearance<br>
> and conttrast of LED displays is significantly improved by the use of<br>
> colouored filters. That's why commercial clocks etc always have a dark<br>
> tinted front panel - it transmits the display colour but blocks the<br>
> background, significantly increasing contrast and readability.<br>
><br>
> Has anyone come across coloured tinted translucent plastic foils? I have<br>
> a feeling I've seen them a long time ago.<br>
><br>
> I'll need them in blue, pure green (not yellow-green), dark yellow, and<br>
> red, and would appreciate a note if someone happens to have seen<br>
> something like this, before I trawl all the shops...<br>
><br>
> Thanks,<br>
><br>
> Volker<br>
><br>
> I'll have it with me on Monday.<br>
><br>
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