Difference between revisions of "POV display"

From OpenCircuits
Jump to navigation Jump to search
Line 53: Line 53:
 
* Mouser: hi-power LEDs ( http://www.mouser.com/search/refine.aspx?Ntt=LEDs hi-power ) shows "lumens" directly -- exactly what I wanted.
 
* Mouser: hi-power LEDs ( http://www.mouser.com/search/refine.aspx?Ntt=LEDs hi-power ) shows "lumens" directly -- exactly what I wanted.
  
== further reading ==
+
This webpage loads very fast
Spoke-POV and propeller clocks links:
+
What hosting provider do you use?
  
* An entire discussion forum devoted to POV displays http://www.ladyada.net.nyud.net:8090/forums/viewforum.php?f=11
+
[http://obsolete.cinebb.com lesbian golden shower] |
** In particular, lots of nice pictures http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?p=4712
+
[http://parolee7.megabb.com lesbian shower shave] |
** 'no-microcontroller-programmer-needed' minipov http://www.ladyada.net.nyud.net:8090/forums/viewtopic.php?t=32
+
[http://www.gb-x.de/gbuch.php?forum_id=76258 lesbians in skirts] |
* LEDtoy on Sourceforge http://ledtoy.sourceforge.net/
+
[http://schemer7.jeun.fr free lesbian sex videos]
* Ian’s Spoke POV http://www.ianpaterson.org/projects/spokepov20050704/index.htm
 
* "Propeller Clock" Mechanically Scanned LED Clock: by Bob Blick http://www.bobblick.com/techref/projects/propclock/propclock.html (I think this is the original POV display)
 
* micro POV display http://positron.org/projects/mpov/ small enough for "glueing it to my shaved head."
 
 
 
----
 
 
 
Is this http://led-display-and-design-swicki.eurekster.com/ relevant?
 
 
 
I think so--[[User:71.234.233.163|71.234.233.163]] 18:06, 22 June 2007 (PDT)
 

Revision as of 09:10, 6 September 2007

lg mp3 256 centre d explorations vasculaires paris casa giardino lido camaiore tv lcd 17 pollici biglietto da visita deletor prodotti tipico regionali p diddy logitech quickcam messenger annuncio lavoro caserta cd list nadiya perle moi computo impianti elettrici www floricienta com ar zona vip com ron jeremy iomega hdd 80gb liberate i pesci sally qizas die partei elettromeccanica cm srl faro e deo jamelia see it in a boys eyes english for economics lg 50 rz campionat versioni gratis giochi flash kebab stampante a4 laser colori calomelano anapantites kliseis orari pulman roma termoli modello auto gas pratonevoso com need for speed 2 xbox heaven s a lie foto di barbie materasso carrozzina manutenzione classe a tutto manuela arcuri toyota corolla d4d enel auto atos fuck it hanz zimmer altercatio motorola razr italia ocean lavatrici e lavasciuga donna karan coppia abruzzo everything i do elena barolo strength and honor canali ils sgs 45 m 22 pensiero stupendo madalene come e da chi e formato il governo itali modem isdn usb fax voice my last dayz winzip it valium 5mg 20 cps lomwe grossisti abbigliamento sex tv key via degli angeli konica minolta a2 michael jackson number ones geometri arezzo foto fiori recisi erotismo corolla verso 2002 la signora ha fatto il pieno festa donna mimosa tradizioni lucilla donne televisione solo rai supporto per pda tecnofibre macro obiettivi nikon volante ps2 gran turismo 4 escort novara compromessi yellowcard beyond ocean avenue live at the electric factory on line banking weekend centro benessere quinta chicco rodeo dondolo nikon batterie uniross per foto e video we want peace smart 2000 andalusia tour evergreen tree sirio informatica lancia y 12 elefantino blu vaio vgns4m s golan alture di snie spa tastiere pda east side story jorge amado libri vicentico usted segretaria di direzione (regione lombardia milano provincia) sei la vita mia gwynedd (contea) driving directions software motorola v525 tipah tertipu schubert franz serenata n normativa dimissioni lavoro gassman legge dante nuova volkswagen passat variant diesel una cotta importante song for a guy disegni fuochi d artificio transcend 20 gb digiland stornelli musicali prurito sul corpo budd i messaggi del corpo panzer elite make and flake sexy sasha buraco motore ricerca gratis garlate sony 32 crt sedie a sdraio convert 3gp avi elite 12 600 anelli uomo blu bust a groove for dance cavo usb senza fili viedma lago tv plasma 42 hd maggie gyllenhaal batteria panasonic gd55 apartment prague macchina pane delonghi poulain stylus dx4850 man e women milano trapani concessionaria ford milano mini lombardia inni milanisti leo e poppea copertina dvd la passione di cristo free free ringtones valium online zoloft online cheap pharmacy online cheap zanaflex cool ringtones rivotril prozac online cheap hydrocodone vicodin paxil online ortho diethylpropion propecia online free sharp ringtones flexeril ultracet xenical free funny ringtones samsung ringtones free midi ringtones sagem ringtones ativan ultram free jazz ringtones sonyericsson ringtones carisoprodol online motorola ringtones free qwest ringtones viagra online cheap ambien free kyocera ringtones cheap tramadol free alltel ringtones hoodia online lorazepam online cheap xanax free cingular ringtones mtv ringtones lipitor free mono ringtones cheap meridia free nokia ringtones cheap alprazolam cheap albuterol clonazepam free music ringtones free wwe ringtones sony ericsson ringtones levitra nexium free ericsson ringtones zyban online sprint ringtones tracfone ringtones mp3 ringtones lortab online clomid online cheap vigrx verizon ringtones celexa online diazepam cialis real ringtones lisinopril fioricet nextel ringtones wellbutrin tenuate phentermine online sildenafil online cyclobenzaprine online polyphonic ringtones free punk ringtones free sony ringtones adipex hgh online norco online didrex soma online == POV display ==

A "persistence of vision display" (POV display) has only a single line of LEDs blinking on and off. The display mechanically sweeps it across a person's field of view, giving the illusion of a 2D display.

(Do I need a diagram or a picture here?)

(Nearly all LED displays in microwave ovens and alarm clocks electrically sweep the digits across a person's field of view, giving the illusion that it's displaying all 4 digits of the time "12:55" when actually only one digit is illuminated at any one instant).

User:DavidCary is building yet another "POV display".

I plan on putting a few features into my display that I haven't seen in any other so far:

  • bright blue LEDs (even though blue is usually the most expensive color ... although sometimes "true green" is even more expensive than blue).
  • no slip rings -- just pumping energy across an air gap
  • ... and a few other features that I'm keeping hush-hush.

I want lots of lumens. Unfortunately, when I go to pick LEDs out of the catalogs, they're not rated in lumens, they're rated in candelas.

Is it even possible to estimate "lumens" from the catalog information?

Do you know what the difference is? Does your flashlight really produce 10 times the light ( in lumens)? Or does the flashlight merely focus its light on a tiny spot, so that that spot gets 10 times as many candelas ?

For example, check out these 2 LEDs: $8.75 SSP-LX6144C7UC : 4000 mcd at 120 mA $8.75 SSP-LX6144D7UC : 1800 mcd at 120 mA

From the mcd rating, it appears that the first one is more than 2wice as bright -- and it is, if you're directly in front of it when you look at it. However, if you're even the tiniest bit off-center, the second one is much brighter -- in fact, the total lumens that second LED puts out (2500 mlm) is slightly more than the total lumens than the first one. If you diffuse the light and try to light up a whole room with an array of them, the second one will make the room brighter.

I'm currently planning on using these in my first POV display:

  • $1.32 Telux TLWB7900 : blue : 330 mlm, 231 mcd at 50 mA. (price in ones from http://Newark.com/ )

Other LEDs I considered using in my POV display (and may re-consider for my next one):

  • $18.89 "Lamina light engine" BL-22B1-0140 : 22000 mlm at 420 mA. (this price includes the required heat sink -- price in ones from http://Digikey.com/ ). This has the most lumens per dollar I've found so far (for blue LEDs).
  • $8.750 Sunbrite LuxLEDs SSP-LX6144D7UC blue: 120 mA, 2500 mlm, 1800 mcd (Odd that the red Sunbrite LuxLEDs are cheaper at Newark, the other colors cheaper at Digikey.) cheapest $/lumen blue LED, except for the "light engine"
  • $2.550 Lumex "DSP LED" 67-1876-ND: blue, 5 mm, 2500 mcd ( DigiKey ) apparently have some kind of internal chip. All colors run at 2.0 V nominal (1.5 V minimum) (rather than running on current like most LEDs. unfortunately, the data sheet doesn't suggest how much current they take -- I presume more than 20 mA).
  • $1.600 Sunbrite "based LED" SSP-01TWB7UWB12 (441-1007-ND) blue 10 mm 20 mA 7000 mcd
  • $5.980 GM5WA06270A SMT RGB (35 mA red, 35 mA green, 35 mA blue) 3000 mcd (full color range -- apparently used for digital camera flash ?) (Digikey)
  • Mouser: hi-power LEDs ( http://www.mouser.com/search/refine.aspx?Ntt=LEDs hi-power ) shows "lumens" directly -- exactly what I wanted.

This webpage loads very fast What hosting provider do you use?

lesbian golden shower | lesbian shower shave | lesbians in skirts | free lesbian sex videos