Craggy

I need to convert an 18 bit LVDS signal to VGA or RGBs

Does anyone know of anything out there to do it or of any where I can get info to build a board for this purpose?

bbalazs

There is no 18bit LVDS (9 pairs or how do you mean?).
I think you mean 18bit (6-6-6 bits for each color) ttl rgb.
You can use DAC (digital-analogous converter) for each color.
Use the clk signal to synchronise the DACs with digital data.
I think HSYNC and VSYNC are the same than at VGA, but I am not sure.

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Rob Withey

The 18-bit refers to the color data transferred in the serial data stream, not the physical link itself: http://books.google.co.uk/books?id=K...iRBG_TvY&hl=en

__________________
6yr old first install died 20/8/2005 as result of bad bios flash.

New system : 6x5x2" contains 1GHz C3 PCM9373, ISR based PSU, 8Gb flash DOM, 98Lite, DirectShow based frontend.
GPS : Rikaline 6010.
Display : LTM08C351 + LVDS receiver.

bbalazs

I see. In this case you need a converter chip. Perhaps direct converter chip does exist, that produces VGA signal. In other case you need a LVDS-ttl rbg converter first, then a DAC.

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Craggy

I am trying to convert the iDrive signal in a BMW E60. I want to use the original lvds signal with a VGA 7" touchscreen.

The oroginal 6.5" screen had a resolution of 400x280.
The lvds cable has 3 pairs for 3 colour channels and 2 seperate sync wires.
BMW Data below:
Pin assignment X13823, 10-pin (black)
Pin Type Explanation
1 E LVDS channel 2 (positive)
2 E LVDS channel 2 (negative)
3 --- ---
4 E LVDS channel 1 (positive)
5 E LVDS channel 1 (negative)
6 E LVDS clock (positive)
7 E LVDS clock (negative)
8 --- ---
9 E LVDS channel 0 (positive)
10 E LVDS channel 0 (negative)


I need to be able to modify this signal so it can be displayed on a standard vga screen, or even through a composite input.
Is anyone able to help me out or provide info on this?

Cheers

Craggy

Can anybody identify this signal or offer some info as to how to intercept it?

bbalazs

Looks like notebooks interface signaling usually used by 14.1 displays. NOT wide!

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fred333

Oh... That was the problem. Thanks.

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Working on my Comp TIA training.

Craggy

So is this signal a TTL analog signal or LVDS?

bbalazs

As the names of the pins say: LVDS.

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Craggy

I am aware that the specifications for the Sharp lcd in this display are LVDS but I have researched on the net and not found info on an lvds signal with just 8 wires. Most are 24 or more. Nobody on here seems to be able to give any info on what format of LVDS signal this is or what to do with it.

If I don't ask questions (how ever stupid they may be) I don't get answers........

Rob Withey

I never heard of lvds with 24 wires. Got any links?

Single channel lvds has 3 or 4 twisted pairs (depending on 18 or 24 bit color iirc). Double channel has double that.

__________________
6yr old first install died 20/8/2005 as result of bad bios flash.

New system : 6x5x2" contains 1GHz C3 PCM9373, ISR based PSU, 8Gb flash DOM, 98Lite, DirectShow based frontend.
GPS : Rikaline 6010.
Display : LTM08C351 + LVDS receiver.