Crt Tv - Page 1
Forum section: electronics / general

author: sony mavica
author_rank: Frequent Contributor
timestamp: April 22, 2016, 11:35:26 pm
content: So i use a 15" crt tv with built in dvd player i found about a year ago driving past a dumpsterwatching dvd's on this tv the colors and picture look amazing compered to any lcd or plasma tv i have ever seen even when watching low bitrate video using my wii eg 240p youtube the picture is still really goodwhy does crt look better?

author: Halcyon
author_rank: Unknown
timestamp: April 22, 2016, 11:50:38 pm
content: Quote from: sony mavica on April 22, 2016, 11:35:26 pmI think it's got to do with phosphor persistence and lower refresh rate. While the resolution is lower, it looks more aesthetically pleasing as it hides shuddering caused by "low" frame rate video (24/25 fps) and imperfections like deinterlacing are less noticeable (that's if you're playing deinterlaced video, which there is no need on a CRT).I have a fairly expensive LCD TV which has a great image. However anything under 720P looks worse in my opinion, even with all the additional image processing turned on. The picture and motion looks "naked" and annoying to watch. I need to turn on some post-processing just to make it appear decent.

author: Whales
author_rank: Super Contributor
timestamp: April 23, 2016, 12:28:59 am
content: I have a similar issue watching a movie on my computer vs my TV. On the TV it looks fine, on the computer I can see the compression artefacts. It's probably a combination of psychology and the fact the TV has a lower resolution, rescales the image and applies an unsharp mask.

author: Brumby
author_rank: Unknown
timestamp: April 23, 2016, 01:19:03 am
content: Put a sheet of freezer wrap on your monitor screen. That'll smoosh the picture quality for more comfortable viewing.

author: German_EE
author_rank: Super Contributor
timestamp: April 24, 2016, 12:10:29 pm
content: What you're looking at is the difference between two technologies:1) A CRT produces light using electrons to excite the RGB phosphors but an LCD starts with a white light and attenuates various parts of the color spectrum to generate the image.2) The LCD backlight is not pure white3) The LCD image has to pass through two polarized filters, this reduces the contrast. The contrast on a CRT is not perfect (unenergized phosphors are gray) but it is still much better than an LCD screen.4) The number of colors that can be produced by an LCD screen is lower than the number of colors that can be produced by a CRT. Seehttps://en.wikipedia.org/wiki/Gamut.5) A typical color LCD is only six bits per color giving 64 levels per color.

author: uncle_bob
author_rank: Unknown
timestamp: April 24, 2016, 02:24:37 pm
content: HiTwo issues are at work:1) Things sold as monitors may (as in do) not have very good color balance. Unless you play a lot with settings, it is unreasonable to expect great color out of your typical monitor.2) Small screens will always look better than large ones for *some* issues. Your eyes simply can not pick out the detail on a small screen that they can on a large screen. Most DVD's have a *lot* of issues ....Bob

author: Artlav
author_rank: Frequent Contributor
timestamp: April 24, 2016, 10:16:33 pm
content: I'm kinda surprised at that - i find that CRT tvs are A. flickering painfully, and B. whine painfully.Oddly enough, neither of that were an issue 15 years ago.

author: NiHaoMike
author_rank: Super Contributor
timestamp: April 24, 2016, 11:17:13 pm
content: Quote from: Artlav on April 24, 2016, 10:16:33 pmBack in the day, good CRTs often operated at 75Hz or above, reducing flicker. I'm not sure how they displayed video at 30 FPS with smooth motion.

author: helius
author_rank: Super Contributor
timestamp: April 25, 2016, 12:10:34 am
content: Professional workstation CRTs could refresh at up to 150 Hz, which is not perceptible as flicker at all. I found the minimum acceptable refresh rate to be 72 Hz, although lower rates don't flicker visibly: the main problem is that they create eyestrain. Obviously the level of flicker also depends on the phosphor persistence, but most computer monitors use the same phosphors.They display video at 30 fps (or 29.97, or 25, or 24) using pulldown like any display, but the issues of deinterlacing and field dominance are a big problem for any computer system working with SD video.CRT TVsare almost always interlaced and are disturbing to look at up close.

author: sony mavica
author_rank: Frequent Contributor
timestamp: April 25, 2016, 02:57:06 am
content: thanks for the info guys