LVDS 40 pin to eDP 40 pin converter?

I cannot seem to find a capable LVDS 40 pin input to eDP 40 pin output converter board anywhere.

I am convinced such a board doesn't actually exist.

I did manage to find a STDP4082AB IC that has the capability to process these signals, but am not an engineer, and cannot actually manufacture a board that utilizes the chip to convert them.

There is a reference board here: https://www.digikey.com/products/en?mpart=RD1-4028&v=1654

but of course it isn't exactly what I need....

Does anyone possess such a converter, or have the ability to make one?

 

this is a good question. @t456

 

You can find 40-pin LVDS to 30-pin eDP, but 40-pin eDP would be rare or has to be diy and it'd still be a only doing 2-lane. Reason is that single-connector LVDS in laptops can only do 2-channel (max. 1200p) and eDP only needs 30-pin to run 1080p (1 or 2-lane) and very few panels would use the oversized 40-pin connector when a simple, cheaper 2-lane is sufficient. Only 120Hz or 3k/4k eDP panels would need those and you can't drive them with a converted LVDS signal anyway due to its bandwidth limitation.

Some small-sized adapters you can use in a laptop:
Upgrade IPS FHD Screen Kit for laptop 1440X900 1600X900 LVDS to EDP 1920X1080
LVDS to eDP Signal Conversion Adapter Board 30pin driver board LCD Controller

The second model needs a separate source for the backlight power. Bit weird though since you might just've re-used that of the LVDS input, same as that first adapter is doing.

 

so is this better? is that compatible with an old acer 5750g?
LP156WH2-TLEA
http://www.panelook.com/LP156WH2-TLEA_LG Display_15.6_LCM_overview_12269.html

 

Ah dang.

I was *hoping* to try some hacks and force a video card to output eDP 4lane over a LVDS medium. The GTX 970m supports both LVDS and eDP. I don't know if electrically that would even work. I know that LVDS is supposed to be stupidly low power, 350mV or something, and I'm completely unsure how much power eDP uses.

https://www.usmicroproducts.com/blog/understanding-display-interfaces mentions that LVDS can max out @ 3.125GB/s (not 3.125Gbps), and doing 2560x1440@120hz would only be something like 1.65GB/s. The medium is supposedly capable.

For reference, I have a HP 8770W non-dreamcolor edition laptop, that I was hoping to cram a QHD 120hz monitor into. It uses LVDS, and has the Intel QM77 Express chipset.

I'm new to monitor tech in general, I just learned about eDP and LVDS yesterday actually. And I learned that LVDS "maxed" out at 1920x1200@60, but I'm bad at pixel bandwidth math.

If I am correct, the LVDS and eDP transmitters start in the video card, transfer to the chipset southbridge, then finally to the monitor controller via the port on the system board?

My only other option would be to take my newly purchased MXM GTX 970m, and find a new toy that uses eDP. eDP QHD panels are surprisingly cheap to get ahold of.

Sad too, because I am in love with the 8770w. Too bad it came out a year before eDP was invented...

Edit: What's really weird though, is according to the Datasheet for the QM77 Express chipset, it does in fact support eDP:

https://www.mouser.com/pdfdocs/7serieschipsetpchdatasheet.pdf

Check out page 55 of that PDF

Edit2: Just learned that the highest supported eDP is 1.1, on a chipset that came out in 2012.

That means, even if I did somehow manage to get eDP working on this motherboard, I am still stuck with the LVDS max of 1920x1200@60.

In essence, it is not possible to get anything greater than that working in this laptop.

 

Maybe. That TLEA is only a 1-channel, so it's probably using a semi-populated cable atm:

Spoiler: LVDS cable, single channel (lacking pins on connector)

There are a few 1-lane eDP panels, but think you'd want 1080p as well. So try to find out whether this system supported fhd and see if you can find its 2-channel LVDS cable. Once you have that and can tuck away that adapter somewhere then there's tons of quality eDP panels to choose from.

It's just an interface type though, so there's really no benefit to its image quality. This adapter is only useful to re-purpose an eDP panel or in a situation where there's no comparatively good LVDS equivalent. That's pretty rare though; manufacturers have taken the existing LVDS panels and merely added an eDP->LVDS chip to the pcb. One exception would be trying to run an OLED since these were never made with a native LVDS interface. That is, assuming they even exist at this size by now.

Well ... 3k/4k is not going to fly easily, but with a bit of overclocking 1080/1200p@120Hz is feasible.

It's pretty much linear, but you also have to consider bit-rate; 6, 8 or 10-bit colour also takes up space. This is a 4096x2160@60Hz 10bit colour LVDS display: LM310UH1-SLA1.

Pretty neat. But that thing needs 8 channels and, thus, a dual connector with ~50+~40=~90 pins in total. Hence the ' in a laptop' caveat; 2-channel with 50 pins is the maximum. That is, except for the weird DreamColor systems; those displays are dual connector, 50+20-pin, 4-channel LVDS, but it's using a separate eDP->LVDS adapter board to drive it. By the time it came out there was already eDP v1.2 and, unfortunately, that can cram sufficient data into a 2-lane connector to drive that 4-channel LVDS panel. If you're luck it's really using 4-lane eDP (search its motherboard schematics), but you'd still have a tailoring problem since the HP is 17.1" and the 3k/4k eDP panels are all 17.3" ...

With most systems, yes. But some (gaming systems, mostly) can drive the display directly from the dGPU without making use of the chipset at all. Others use the dGPU output and merely use the chipset for eDP<->LVDS conversion.

New toy, unless you can find that motherboard schematic.

Not for the DC system, at least; it won't be using the chipset, but is probably driving the DC adapter board directly from the dGPU and running eDP 1.2. Even if it's a 4-lane that still won't be an easy switch since the 17.3" panels are too wide to drop in the HP lid as-is.

A 1200p@120Hz is attainable though. My old D800 can do 1920x1200@185Hz 6-bit before artifacting, a 300% overclock over its official bandwidth limitation. That's overclocking the bandwidth per channel, not splitting the same 2-channels into a 4-channel signal, which all 3/4k panels at this size range are using.

 

yes, I'm thinking for a replacement with a fhd better panel. I really appreciate that guidance about the cable. thanks

 

I actually used that exact website yesterday to figure out that QHD@120hz 10 bit would be 1.99Gbps and 8 bit would be 1.65Gbps. That's why I got confused when people said LVDS maxed at WUXGA@60hz, since, I guess theoretically?? LVDS can do 3.25GB/s

I guess they stopped at WUXGA on LVDS for...reasons?

By dGPU do you mean discrete GPU?

The 8770w was a workstation class originally came with either the nVidia quadro k2000? (i think it was K2000) and the AMD M4000 and my motherboard variant at least is the QM77 4D, which only has a LVDS header.

The chipset, according to the datasheet supports eDP 1.1 and LVDS, which both max out at WUXGA (****ty)

How can I tell if the GPU is bypassing the chipset and directly driving the monitor?

As for that monitor, I am gobsmacked. I'm amazed they made one with those specs using LVDS.

I tried for days to located a 17.3 inch IPS QHD@120hz 10bit panel, but they don't exist. Probably tech limitations. The closest I found was the B173QTN01.0 - .4 (there are 5 variations, from .0 to .4 iirc) from AU Optronics. It's a TN QHD@120 8bit with claims from some manu's that it is IPS, but it's really just a HVA monitor.

Sadly, it just won't be possible to exceed WUXGA@120hz in my laptop. Sad too, because I got it for free. Spent 300 on the 970M gpu and 20 on the nVidia style heat sink, as mine was a single pipe that was made for the AMD discrete GPU.

I'll have to look for other workstation class laptops. They're usually the best to turn into high powered gaming rigs. And, at least in my experience, cheaper to get off of eBay.

 

So, unbelievably, I actually scored a new toy today. We were throwing out "outdated" systems at work, and a Zbook 17 G1 F7W21UT was headed for the trash bin. An actual HP dreamcolor laptop.

Additionally unbelievably, this morning, I accidentally stepped on, and broke, the screen on my 8770W, because I idiotically left it on the floor all night, and while stumbling around in the dark of the morning, I stepped on the screen. So now I need a replacement for that.

But in the mean time, I actually have a new Zbook with dreamcolor. This screen is real nice.

I am going to see what the deal is with the hookup for this, if it is eDP or LVDS (really hoping for eDP goodness).

I do know it is the Intel QM87 Express chipset, so I'm hopeful that it is at least working with the times.

 

The panel itself is LVDS (all panels are, really), but its cable and mb connector will be eDP. This the same for all DreamColors.

Odd thing to throw in a bin; especially the adapter board is unobtainable unless it came with the system. That ZBook sports a non-U quad core Haswell too, with a nice 8GB Quadro to boot. Would guess 90-95% of every new system will be slower than this 'outdated' model ...

 

Pretty much my thoughts.

I just tried (and failed) to install a MXM 3.0b GTX 980M ( https://www.ebay.com/itm/123438242912) but unfortunately, I cannot get the system to even boot with the card in. UEFI doesn't like it. And since my system is Win10 UEFI mode, I might have to get Win7 up and running before this will work. Not sure.

 

Im wondering if anyone here can help me stick some kind of usb or thunderbolt connection onto q screen either a 17.3 Dc or a 15 ips. Hiw would i be abke to achieve it

 

Why?
Not possible but why?

 

I need a portable monitor for work and ive got 2 old screens from zbooks.

 

Yes, that's the purpose of the adapter board.

Spoiler: DreamColor adapter - eDP (motherboard) to LVDS (panel)

 

So is there no way to push power from usb 3 or any other port to a 4k screen or anything like a 1080 similar to gechik portables

 

@t456 odd question.

The colorboard for the HP dreamcolor panels has two outputs, and the monitor has 2 inputs.

Is one of the inputs for 8bit, and the other for 10bit? I cannot sus out any other reason why there are two different input channels...

 

No. It's because a DC needs 70 pins in total and splitting it up in a dual 50+20 connector has a few benefits:

1. run-of-the-mill connectors
2. less interference (em noise)
3. easier pcb design since you don't have to untangle the lcd from the bl traces

That is, the 50 pins serve only the lcd, which is the physical image, and the 20 pins are purely backlight (RGB LED). Regular panels using a White LED backlight and 6/8-bit colour needn't use as many pins and simply align lcd+bl on the same 30- or 40-pin connector.

Of course, 10-bit needs more data than 6 or 8-bit. So in order to get a bandwidth rate that is high enough for 60 Hz it can't rely on a standard 2-channel configuration. Hence the whopping 50-pins; it's using a 4-channel design, same as many desktop monitors.

 

Makes sense.

I'm learning more every day. Thanks!

BTW, did you happen to spot my question in the other thread I started, regarding my failure to get the Dell GTX 970m working in my G1 Zbook 17?

I suspect it has to do with the fact that it's Dell. I can't get the system to boot at all with the card in, preventing me from even being able to flash a different vBIOS onto it...and I don't have a dell computer with a MXM port, so I'm unable to even flash a modded vBIOS on while it's in a working system...

 

Is there any solution to getting the 1080p 15 inch via usb. Its not a dreamcolor monitor