[ltp] External LCD monitor

[Richard Neill]

My understanding of this is the following:

LCD panels have a native resolution which is defined by the way the 
pixels are located on the glass.

CRTs don't, because there are very many more phosphor dots than pixels.
(e.g. you can scale/move the image on a CRT monitor using the monitor 
buttons).

The consequences are:

CRTs can work at any resolution. Anti-aliased fonts also look good.

LCDs really don't work at anything but their design-resolution. Anything 
else will look badly smudged. (an exact multiple will work better eg 
800x600 on a 1600x1200 display). A-a fonts are also often not nice.

The problem with high resolution, small size LCDs is that fonts are 
often tiny. The fix is to add the DisplaySize line to 
/etc/X11/XF86Config-4. Eg on my thinkpad at 1600x1200 on a 15" display, 
I have


Section "Monitor"
     Identifier "Generic|Generic Laptop Display Panel 1600x1200"
     VendorName "Generic"
     ModelName  "Unknown"

#Added by rjn to sort out tiny fonts - these are width, height in mm
     DisplaySize 304 228


That means that you have to drive your external panel at its native 
resolution, not the same res as the internal LCD. This is possible (but 
I've never done it, so I can't say how).


Hope that helps a bit.

Richard





D. Sen wrote:
> Thanks. Yeah, the aliasing was bad with the 1600x1280 monitor. Pictures 
> were fine though. I do have a port-replicator with a DVI output. I will 
> see if that makes it any better.
> 
> (Using a T30 BTW).
> 
> 
> Allen, Michael B (RSCH) wrote:
> 
>> You need to use the DVI output or it will look interpolated. The port 
>> replecators
>> usually have DVI out although I would check that the DVI out supports 
>> that
>> resolution. Incedentally the 22" Dell FP is currently $799.20. I got 
>> one a while
>> back. It's nice if you have DVI out (had to get the Radeon 7500 I 
>> think it was). I
>> don't have a port replacator yet so I don't know if it will work with 
>> my T30.
>>
>>
>>> -----Original Message-----
>>> From:    D. Sen [SMTP:dsen@ieee.org]
>>> Sent:    Thursday, March 13, 2003 8:28 PM
>>> To:    linux-thinkpad@linux-thinkpad.org
>>> Subject:    [ltp] External LCD monitor
>>>
>>> I am thinking about buying an external 17-19" LCD monitor that will 
>>> work with my thinkpad which has a native resolution of 1400x1050. Any 
>>> suggestions on what works well?
>>>
>>> I tried the thinkpad on an external Mitsubishi panel with 1600x1280 
>>> resolution and it didnt look too good.
>>>
>>> Thanks,
>>> DS
>>>
>>>
>>>
>>> -- 
>>> The linux-thinkpad mailing list home page is at:
>>> http://mailman.linux-thinkpad.org/mailman/listinfo/linux-thinkpad
>>
>>
>>
>