Swapping a 800x600 for a 1024x768 screen on a CF-M34

I have several CF-M34s and one CF-18 mk1. All my CF-M34s have a 800x600 touchscreen, and with the correct dock they can also use a monitor (CRT/TFT) with 1024x768 (or more) resolution.

As i have the luck of having about 40 TFT-screens in difrent sizes and brands at my disposal, i was wondering if it is possible to swap the 800x600 TFT screen with a 1024x768 one (that has the same physical dimensions as the 800x600 screen) ? If the connector and inverter are compatible with the CF-m34 screen cable, this could be possible.... or not ?

another question is, if i succeed in swapping the screens, would the touch-screen functionality also become 1024x768, or stay at the 800x600 points ?

Are there any members who tried this in the past and have any experience with this subject ?

 

What model is the original lcd screen?
The touchscreen use a analog non linear signal converted to digital signal, transformed to digital linear points if u had calibrated the screen. the resolution depends on the AD-converter.

 

I get another 11 CF-m34s this week. Then i am gonna start my little big upgrade project.. I will post the exact specs of the original lcd screen soon (or somebody else posts it. hehe).

If the touchscreen sticks to the 800x600 matrix, i guess, that i have to reprogram the driver. a simple math multiplier would do the trick.

 

No need for messing up with the touch, it's seen as an analogical unit from the computer and the connection cables transport analogical data, the AD converter hardware is inside the computer, so there's no need to do anything, just to recalibrate the TS if required, for example, if you lead out of the pc the TS cables and connect the TS panel with them, and put it on the desk, you have made a drawing panel... It's the same technology.

For the LCD panel swapping i'm not sure, keep in mind that every panel (at least recently) use LVDS (Low Voltage Differential Signal) type connections, it means that it use two wire for a single bit of information, one wire goes to the panel, go through a resistor and came back to the computer in another cable, this is made to use low voltages and avoiding interferences on relatively long distances, in fact the information is not represented by the voltage, but by a current that flow through the resistor.
A high voltage pulse caused from external noise, will not affect the communication because it will not generate sufficient current in the resistance. Tipically 3.3v is used in these buses, but you can also find some working at 5v (uncommon).

This is just to say that this is the system used for trasporting data, but apart this a panel can use a data codification very different from another panel, there's about 4 or 5 big panel productor on the globe (lg, toshiba, philips, etc) so if you use a panel of the same brand of your, it's possible that it has the same controller onboard, so it can work.

If you look on ebay you can find (from china) a universal panel driver, which you can drive with a normal VGA or DVI output to light up a general panel, that said you have to try it, none can say to you if it will work, especially without knowing your panels brands and models. Make a try, is a very remote possibility to damage the video controller on the computer.

 

I repair laptops as a hobby. All of those TFT panels i have, are from 1994-2003. Anyhow, thanks for the information. I didnt know that you could use the Touchscreen panel for use as a drawing panel.

 

Think you just got to go for it, if it works I may be one of your customers for a full kit to do the mod.

 

The resistive panel is the first technology that was used to make drawing panel, more recently panels use some kind of sensor that "sense" the pencil included with the tablet, i think it's something like the TB digitizer, so you can also put your hand on it and it won't "draw" anything, it will only recognize the pencil.

For your TB keep in mind that cf28 support 800x600 and 1024x768 panels, but only because the video driver (hardware) support it, if your unit don't support that resolution, it will not work, but go on and try.