LinuxQuestions.org
Did you know LQ has a Linux Hardware Compatibility List?
Go Back   LinuxQuestions.org > Forums > Non-*NIX Forums > General
User Name
Password
General This forum is for non-technical general discussion which can include both Linux and non-Linux topics. Have fun!

Notices

Reply
 
Search this Thread
Old 05-10-2003, 10:20 PM   #1
MasterC
Guru
 
Registered: Mar 2002
Location: Salt Lake City, UT - USA
Distribution: Gentoo ; LFS ; Kubuntu
Posts: 12,612

Rep: Reputation: 64
TV's, CRT Monitors, LCD Monitors... refresh rates and other questions


What is the difference between a CRT TV and a CRT Monitor? A plasma TV and an LCD monitor?

Why doesn't a refresh rate work on some CRT's of the same size (19") but does work on others?

What is the difference between Verticle Refresh Rates and Horizontal? And why are they different on TV's than on Monitors? Where can I find a standard "guide" on refresh rates for different devices?

I've read some info around the net on these things, got some links from google.com and stuff; however I am still pretty lost. If anyone can dummy it down a bit and speak POE (plain old english) or compare it to something easy to understand, I'd grately appreciate it!



Cool
 
Old 05-11-2003, 04:25 AM   #2
schatoor
Senior Member
 
Registered: Jul 2002
Location: a tiny place caled hendrik ido ambacht in the netherlands
Distribution: SuSE, debian, slackware, lfs
Posts: 1,358

Rep: Reputation: 45
There are different technics of how to display stuff on a screen. The most common being the cathode ray tube or CRT. It works by shooting of electrons to an screen with an phospor coating. When the electron beam hits the screen, the screen lights up. Actually, there are three electron beams in the tube that account for the three primary color, red, blue and green.
To generate an image, those beams scans the inside of the tv screen. The signal from the cable tells it what color a paticular part of a screen should get. That way, it covers the entire screen and generates an image.
The scanrate is the speed at which the electron beam covers the screen. For instance, 50 Hz horisontally, means the beam is passing over the screen horisontally at on rate of 50 times a second.
Besides the CRT, there are other technics of deplaying stuff on a screen. The plasma tv genarates light in much the same way as for example neon lights, like the ones you seen in Las Vegas.
LCD's make use of the fact that some crystals change color when they are exposed to an electric field.

As for the questions :

Quote:
Why doesn't a refresh rate work on some CRT's of the same size (19") but does work on others?
and

Quote:
And why are they different on TV's than on Monitors?
Got me there

I hope I awnserd some of your questions. If not, I'l hear from ye.

Last edited by schatoor; 05-11-2003 at 04:33 AM.
 
Old 05-11-2003, 06:20 AM   #3
quietguy47
Member
 
Registered: Mar 2003
Location: Everett
Distribution: Slackware 13.37
Posts: 785

Rep: Reputation: 31
http://entertainment.howstuffworks.com/tv3.html
Kind of technical but a good read http://www.projectorexpert.com/Pages/between.html
 
Old 05-11-2003, 06:46 AM   #4
MasterC
Guru
 
Registered: Mar 2002
Location: Salt Lake City, UT - USA
Distribution: Gentoo ; LFS ; Kubuntu
Posts: 12,612

Original Poster
Rep: Reputation: 64
Thank you both for the replies. I'm gonna check out those links now.

Schatoor, thanks for the info! It definitely helps. The one thing that didn't make sense to me was the Primary Colors: Red, Blue, Green. I thought Red, Yellow, Blue were the the Primary Colors since Yellow and Blue make green? Or are there different primary colors for different things?



Cool
 
Old 05-11-2003, 06:48 AM   #5
quietguy47
Member
 
Registered: Mar 2003
Location: Everett
Distribution: Slackware 13.37
Posts: 785

Rep: Reputation: 31
Red, yellow and blue are the primary color's. But, a tv signal(ntsc) only recieves red, blue and green(plus black and white).
 
Old 05-11-2003, 06:51 AM   #6
MasterC
Guru
 
Registered: Mar 2002
Location: Salt Lake City, UT - USA
Distribution: Gentoo ; LFS ; Kubuntu
Posts: 12,612

Original Poster
Rep: Reputation: 64
That seems, to me, to be a waste? How do they display yellow with that?

Thanks for the clarification.

Cool
 
Old 05-11-2003, 07:38 AM   #7
quietguy47
Member
 
Registered: Mar 2003
Location: Everett
Distribution: Slackware 13.37
Posts: 785

Rep: Reputation: 31
Good question
Maybe by(this is probably completely wrong) reducing the signal for blue and increasing the signal for white?
Back to google I guess.
 
Old 05-11-2003, 07:56 AM   #8
quietguy47
Member
 
Registered: Mar 2003
Location: Everett
Distribution: Slackware 13.37
Posts: 785

Rep: Reputation: 31
They never really mention yellow, but they have a chart tht explains how it's done(sort of)
http://www.hometheatermag.com/showarchives.cgi?45
edit: I was completely wrong in my above guess
 
Old 05-11-2003, 09:21 AM   #9
schatoor
Senior Member
 
Registered: Jul 2002
Location: a tiny place caled hendrik ido ambacht in the netherlands
Distribution: SuSE, debian, slackware, lfs
Posts: 1,358

Rep: Reputation: 45
Thanks for the links quietguy47. I'l definatly read 'm when I have time. I thought red, blue and green were the primary colors. Oh well, guess I was wrong.
 
Old 05-11-2003, 09:31 AM   #10
quietguy47
Member
 
Registered: Mar 2003
Location: Everett
Distribution: Slackware 13.37
Posts: 785

Rep: Reputation: 31
Anytime
 
Old 05-11-2003, 08:45 PM   #11
watashiwaotaku7
Member
 
Registered: Oct 2002
Location: wisconsin -- The Badger state
Distribution: gentoo
Posts: 654

Rep: Reputation: 30
well there are two different things...theres the pigment primary colors, and theres the light primary colors...i dont remember what the light primary colors are but everyone always thinks of the pigment primaries when they think of primary colors
 
Old 05-12-2003, 12:33 AM   #12
mcleodnine
Senior Member
 
Registered: May 2001
Location: Left Coast - Canada
Distribution: s l a c k w a r e
Posts: 2,731

Rep: Reputation: 45
MasterC - THe best example I can think of when trying to explain the difference between a computer monitor and a TV is the following discussion I had with our project engineer back in 1995;

engineer: "why did this 19 inch monitor cost $1,800 and my new Trinitron 27 inch tv only cost $900?"
me: "the resolution on your monitor is higher"
engineer: "But i just bought one of the best TV's on the market. This 'computer monitor' thing sounds like a scam."
me: "go home tonight and sit ten inches in front of your TV for a couple of hours and tell me there's no difference."
 
Old 05-12-2003, 02:38 AM   #13
MasterC
Guru
 
Registered: Mar 2002
Location: Salt Lake City, UT - USA
Distribution: Gentoo ; LFS ; Kubuntu
Posts: 12,612

Original Poster
Rep: Reputation: 64
Yeah, I definitely agree. It all just is kind of coming together with the links and replies.

Thanks everyone for your input

Cool
 
Old 05-12-2003, 04:00 AM   #14
JesseJames
Member
 
Registered: Feb 2003
Location: Over the hills and far away
Distribution: Mandrake 9.0
Posts: 122

Rep: Reputation: 15
Monitors can display images at a higher colour resolution, refresh rate and screen resolution. A TV normally displays its image at a VERY low resolution, I think its about 640x480. There are digital TV's available that are normally flatscreens and can be used as both a normal TV and a computer monitor.

Try this link: http://www.pctechguide.com/

I wrote about monitors and flatscreens for an assignment awhile ago. I will try and find the part about displays when I have time.

The reason some monitors can display a higher refresh rate than others is to do with the speed the gun can move at and the speed the data is transferred to the monitor from the graphics card.
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
CRT monitors bad for eyes e1000 General 27 03-21-2007 09:23 PM
CRT Monitors caring tips! Mega Man X General 11 06-28-2005 08:50 AM
LCD monitors etim Linux - Hardware 5 03-15-2005 02:08 PM
Finding my monitors sync rates Ryan450 Linux - Hardware 3 12-30-2004 11:14 AM
Redhat lcd refresh rates out of my control claylong Linux - Hardware 6 12-17-2003 08:30 AM


All times are GMT -5. The time now is 03:34 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration