Bakr Posted December 20, 2004 Report Share Posted December 20, 2004 I have hitachi 20x2 character LCD module. It has Anode and Cathode connections for LCD backlight. Does anyone tell me what type of power source is required for this backlight? Quote Link to comment Share on other sites More sharing options...
mixos Posted December 20, 2004 Report Share Posted December 20, 2004 Hello Bakr Usually a 5V 100-150mA power supply is sufficient. Check here a datasheet of a common LCD module with LED backlight.I also suggest you to check this article:http://www.electronics-lab.com/projects/pc/020/index.htmlYou may interest on this ;) Quote Link to comment Share on other sites More sharing options...
AJB2K3 Posted December 25, 2004 Report Share Posted December 25, 2004 if its a 16pin lcd its uses 5v, if its 14 +2 contacts on far edge its 100vac Quote Link to comment Share on other sites More sharing options...
MP Posted December 27, 2004 Report Share Posted December 27, 2004 AJB, there are others as well. One must read the data sheet for the specific display. MP Quote Link to comment Share on other sites More sharing options...
AJB2K3 Posted December 28, 2004 Report Share Posted December 28, 2004 OK so - if its got 2 connecters seperate on one edge its probubly 100Vac.All refs i find conform to this no matter how many pins in the main strip. The one in that doc has 2 additional grounded pins.I have a 15 pin 4X20lcd that knowone has pinouts for so i assume the 15th pin is the second enable pin for the lower have of the display.I still dont know waht pins are what except for pin 1 which is alwas got the thickest track and is ground.oh and i shoved 12v up a 5vpower line and anothe display stillworks. Now i know its 5v not 12 (ill be bugged if i know where 12 came from) the contrast now works. Quote Link to comment Share on other sites More sharing options...
Ldanielrosa Posted December 30, 2004 Report Share Posted December 30, 2004 I neglected to label the anode and cathode, but this should help. Quote Link to comment Share on other sites More sharing options...
TRENT310 Posted December 31, 2004 Report Share Posted December 31, 2004 So that's how you make a backlight for your LCD... :) Quote Link to comment Share on other sites More sharing options...
Ldanielrosa Posted January 1, 2005 Report Share Posted January 1, 2005 That's one way. I haven't looked at a lot of backlights, but those I've seen are series-parallel arrays two long. The 2*20 modules I have use 42 LEDs. Quote Link to comment Share on other sites More sharing options...
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