LVDS to VGA/DVI - Page 1
Forum section: electronics / beginners

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: June 13, 2013, 03:01:28 pm
content: hello i ahev a samsung LTM154X1-L02 LCD screen and i would like to see if i can use it as a VGA/DVI moniter.what would i have to use to convert VGA to LVDS to drive this screen?datasheet for the screen:http://www.datasheetarchive.com/LTN154X1-L02-datasheet.html

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: June 13, 2013, 03:03:22 pm
content: just realised it can also be connected via Display port or HDMI so these are also good connections which i can use for my computer

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: June 13, 2013, 09:38:30 pm
content: would using a TFP401A doe the DVI input and then putting it into an SN75LVDS83B to give the LVDS output to the screen?

author: c4757p
author_rank: Super Contributor
timestamp: June 13, 2013, 09:49:36 pm
content: Quote from: carbon dude oxide on June 13, 2013, 09:38:30 pm

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: June 13, 2013, 09:56:47 pm
content: so how would i go about making it as simple as possible but not simpler?

author: c4757p
author_rank: Super Contributor
timestamp: June 13, 2013, 09:57:43 pm
content: Buy a DVI LCD monitor. By the time you've successfully developed your own you'll have spent a good bit more than that.

author: jebcom
author_rank: Regular Contributor
timestamp: June 14, 2013, 03:00:15 am
content: QuoteYou would be dealing with about 750 MHz signal on the DVI TMDS lines, so you will need to very careful with signal integrity, meaning you must maintain consistent impedances, and make sure you have low interpair skew (all differential pairs must be the same length), low intrapair skew (both conductors of each pair, usually twisted together, must be the same length), low crosstalk (minimize coupling of signals between the TMDS pairs), and maintain the TMDS eye (control impedance, and especially control capacitance of each pair), all per the DVI spec. Not trivial, and is generally difficult to maintain if you're doing hand wiring/breadboarding/hacking. And that's just for DVI; I don't even know about the rest of the signal paths.

author: carbon dude oxide
author_rank: Frequent Contributor
timestamp: June 14, 2013, 07:44:42 am
content: what about something pre-built like this?http://www.ebay.com/itm/DVI-VGA-GM5621-Universal-LVDS-LCD-Display-Driver-Controller-Board-For-13-22-/221149183532?pt=US_Laptop_Screens_LCD_Panels&hash=item337d84be2c

author: Alana
author_rank: Frequent Contributor
timestamp: June 14, 2013, 08:45:45 am
content: I had some old LCD panels from laptops and i was thinking of buying and assembling this device. But now i have a surplus of LCD monitors with bad caps. I'd try to look for those instead.

author: amyk
author_rank: Super Contributor
timestamp: June 14, 2013, 11:03:54 am
content: You can get the appropriate electronics from monitors that have been scrapped because of a cracked LCD. You'll need to find one with the right resolution, or do some research on how to reprogram the scaler to fit the panel.

author: jebcom
author_rank: Regular Contributor
timestamp: June 15, 2013, 07:19:19 pm
content: QuoteThat one doesn't directly support your display of 1280x800 according to the specs listed.Amyk's suggestion of a controller from a scrap monitor might also work, but it might not be adaptable, as each monitor design is probably cost-reduced and therefore maybe not very flexible. But if it's free, maybe worth a try.