How to find LCD native resolution?

Posted on 2006-10-18
Last Modified: 2008-01-09
I've read that it is best to run the screen resolutuion the same as the native LCD resolution (or pixels).  For the life of me, I can't find what it is for my HP Presario 2145US.  It's not in my manuals.  It's not on HP page for the product specs.  I can't even find the screen size documented.  The laptop is four years old and HP phone support is any help either.

Got any ideas how to figure out the native screen size?
Question by:twgonder
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LVL 14

Expert Comment

ID: 17763658
Dear twgonder,
> HP Presario 2145US
Max resolution 1400 x 1050

Check the article which says it


Author Comment

ID: 17763684
That is a good find!  However, I'm pretty sure from reading around, that one shouldn't run at the listed max resolution, as this is probably not the NATIVE resolution.  I'll try this setting, for fun, and see if the text gets more blurry.  Without knowing the native setting, I may just be poking around in the dark.
LVL 14

Accepted Solution

inbarasan earned 500 total points
ID: 17763709
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LVL 70

Expert Comment

ID: 17763792
The link above does note that the display on your model is "... a large 15-inch display screen capable of crystal clear 1024x768 resolutions ..." ==> but does not confirm that is the native resolution.

It is, however, correct.   You can confirm it on Page 6-4 of the Reference Manual for the laptop (, which notes that the default resolution is 1024 x 768.

HP Computer ... check the HP manual :-)
LVL 31

Expert Comment

ID: 17764419
On an LCD the max resolution is always the same as the native resolution. Always. If you use a higher resolution than the native (if it's even possible to set it) you'll have to pane around to see the entire desktop, i.e. the screen will show only part of the desktop. The LCD will always give best quality screen at the native = max resolution. In other words, the resolution in pixels X pixels should match the physical size of the LCD, also measured in pixels X pixels.
LVL 70

Expert Comment

ID: 17766158
"... On an LCD the max resolution is always the same as the native resolution ..." ==> BUT on a laptop the stated maximum resolution is for the graphics adapter, NOT the LCD panel, since an external monitor may be attached.

Expert Comment

ID: 17769301
Generall speaking, all LCDs (including flat panels and laptops) are set for their native resolution to be the same as their maximum resolution.  If the maximum display resolution and the maximum video resolution is different, it is generally stated as such in the specifications in the manual.
LVL 26

Expert Comment

ID: 17777428
Boy aren't we confusing the issue today~ whew~

Laptops have two max resolutions:
One for the installed LCD screen.
One for an external monitor.

They have one native resolution.
For the LCD screen.

You have to pay attention the which resolution you are reading about because it's common for spec's lists to be vague about which one they are refering to.

A 15" LCD screen would most likely be 1024x768.

Author Comment

ID: 17777874
Yes, it has gotten confusing. Never trust the sales literature!

The Window's Display Property window allows me to set the display to 1400 x 1050 and panning doesn't happen.  I played an intense R/C flight simulator program with 3D graphics and that worked and looked good.

The manual does say the default is 1024 x 768 and that works fine too.

I don't know how Windows finds Plug-n-Play monitors by name.  If it can "communicate" with the monitor, is there a way to get that info from the monitor (LCD) with a utility?  Seems logical.
LVL 26

Expert Comment

ID: 17779111
Basically there is a ROM chip in the monitor itself that windows takes the monitor data from.
Same idea as a firmware chip in something else.
The signal is called DDC.
The current is version is DDC2 which allows bidirectional communication between the monitor and the PC.

When you look for things like KVM's you will occationally see "DDC (Display Data Channel) compatible".
What that means is the monitor and PC can communicate -through- the device.

I don't know of any utility that will do that but that hardly means on doesn't exist.
I've never had a need for one and so never looked.

Author Comment

ID: 17935764
There were a lot of good ideas here.  However, no one actually answered the question and my noted observations actually contradict some of the ideas/suggestions/findings.  I hate to throw away good ideas, but if EE wants a solution, and we don't have one, then from what I've read we need to delete.

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