LVDS Laptop LCD

kangar0065

My Mini ITX mother board has an LVDS header. At first I thought I would never need to use it for anything but when I was thinking about buying an LCD monitor for my ITX computer I decided to do a bit of research into using the LVDS header to connect to an LCD module. That way I could find a cheap old Laptop and use its LCD.

I discovered there is nothing difficult about it, you just needed to get the right parts and connect them up.

You need:
- Motherboard with LVDS header in this case its a VIA EPIA M11.
- LVDS module for the mother board. I brought a VIA LVDS-05 Module
- An LCD module that uses the LVDS interface and a compatable back light inverter.
- Cables to connect the LCD to the LVDS module. You will have to make these yourself.

Getting the right LCD is a bit of a gamble. The only thing guranteed at this point is the resolution (provided you have researched correctly) I choose 1024x768. The first was a Sony VAIO which unfortunately had a crack in the LCD - so it was no good. The second was a Compaq Amada M700. I dismantled the screen to find the part number of the LCD Module (which is Toshiba LTM14C421E). Then I was able to locate a data sheet and confirm it used an LVDS interface, get the pin out for it and find the operating voltage (is 3.3V for this one).

Then I had to make up a cable to connect it to The LVDS module. This involves fiddly fine connectors and wires.
I needed a plug to fit onto the LVDS module and luckily the LCD panel connector from the VAIO laptop fitted perfectly.


(原文件名:Paul-20-LVDS-Conected.jpg)
The VAIO Connector with a flexible circuit board I found in my junk that had longer contacts than the original allowing me to solder my own wires to it. LVDS signals need twisted pairs made from wires of equal length.


(原文件名:Paul-20-LVDS-Connector.jpg)
Connect the other end to the LCD module. I decided to connect to the existing wires since they already have the correct plug fitted to the LCD module end

(原文件名:Paul-20-LVDS-LCD.jpg)
Install LVDS Module on Mother board. Its the board with the VT1631 chip and the white 2 row connector.

(原文件名:Paul-20-LVDS-Module.jpg)
Connect up LCD module

(原文件名:Paul-20-LVDS-Test.jpg)
The smoke test proved every thing was done right and compatible.

(原文件名:Paul-20-LVDS-Wiring.jpg)
I mounted the LCD to a piece of wood using the laptops original hinges. This works well and it is as functional as a normal brought LCD computer monitor. Its using a digital Interface so there is no need to adjust anything and the picture is always sharp and clear.

I was not able to find any pin out details or specification for the back light inverter. Using common sense and some bench power supplies I was able to identify the Power, ON/OFF, and brightness lines and that it runs from 12V, so it is run stright off a disk drive power conector. I used trimpots to divide the 12V down to the required voltages for the ON/OFF and brightness lines.

The back light ON/OFF line could be connected to the LVDS module which would allow windows to control it.



http://www.oldvcr.tv/projects/index.html?Mode=View&ID=20

ddds

mark

avic

这是啥啊？

shangdawei

MARK

armfans

什么主板啊，带LVDS的主板可不多，一直想找一款便宜的，手上有几块LVDS的LCD

huxiaoping

威盛的主板，带CPU,价格上比较便宜，适合特殊场合使用

hoho34

LZ我也在弄一块VIA主板的LVDS，方便的话，有些问题能请教下么？
谢谢~！
我的联系方式：
QQ：58213216
e-mail：zhangjunqing34@126.com

taomo

谢谢啊。想请教一些问题，我用FPGA的LVDS做ADC的，后续的CIC和FIR用MATLAB已经做完了，现在就差这个LVDS了，谢谢啊，
我的联系方式：
QQ:1046519743
email:taomo1220@163.com