General > General Technical Chat

An expensive TV is a poor investment, and people spend FAR too much on them

<< < (14/39) > >>

Ed.Kloonk:

--- Quote from: Zero999 on February 04, 2022, 10:43:30 am ---CRTs often degrade slowly, rather than suddenly. A supermarket down the road from my parent's house has a CRT TV, used as a CCTV monitor. The shop opened in the mid 90s and I'm pretty sure has not changed the TV, since then. It's open on average of 12 hours per day, 7 days per week, except for say Easter, New Years and Christmas day. I don't remember exactly what year it opened, but I'll guess 1995, so the TV has been on at least 12 hours per day (it's probably also on a bit when the store is closed, whist the staff are there) for 26 years, minus three days a year, giving about 113k hours of run time. It still works, but the picture quality is poor. It's dimmed and distorted. Degaussing may partly restore it, but the electron guns and phosphor have deteriorated. One day it will just fail and they'll get a new one.

--- End quote ---

When the power goes out, the image remains on the screen?

Zero999:

--- Quote from: Ed.Kloonk on February 04, 2022, 11:54:35 am ---
--- Quote from: Zero999 on February 04, 2022, 10:43:30 am ---CRTs often degrade slowly, rather than suddenly. A supermarket down the road from my parent's house has a CRT TV, used as a CCTV monitor. The shop opened in the mid 90s and I'm pretty sure has not changed the TV, since then. It's open on average of 12 hours per day, 7 days per week, except for say Easter, New Years and Christmas day. I don't remember exactly what year it opened, but I'll guess 1995, so the TV has been on at least 12 hours per day (it's probably also on a bit when the store is closed, whist the staff are there) for 26 years, minus three days a year, giving about 113k hours of run time. It still works, but the picture quality is poor. It's dimmed and distorted. Degaussing may partly restore it, but the electron guns and phosphor have deteriorated. One day it will just fail and they'll get a new one.

--- End quote ---

When the power goes out, the image remains on the screen?

--- End quote ---
You mean burned into the phosphor, so the dead phosphor is visible when off? I don't know, because the TV is always on, when I'm in the shop. I've never seen it switched off.

SeanB:
Plenty common with mono CRT displays, where you could read the fixed menu items power on or off. Also very common with early plasma displays, which would burn in logo places on the screen after a few months. Later ones came with a screen burn removal mode, which simply ran all pixels at full brightness in a slow moving band for a few hours. Brightness much higher than the display would normally allow, and limited to a small band so as to not overload the power supplies.

TimFox:
"IPS" flat-panel displays can also suffer from burned-in images when the image does not change.
-hp- explicitly denies warranty for such displays used with unchanging images, such as surveillance monitors.

MK14:

--- Quote from: TimFox on February 04, 2022, 06:47:31 pm ---"IPS" flat-panel displays can also suffer from burned-in images when the image does not change.
-hp- explicitly denies warranty for such displays used with unchanging images, such as surveillance monitors.

--- End quote ---

Are you really talking about IPS, or might you have meant OLED ?

I've yet to see any image retention or image burn on any IPS or LCD (IPS is a form of LCD screen, as well) monitor or TV.

I've seen it on CRTs though.

EDIT: Here is a source, where they tried on purpose to create image burns, on all 3 TV (monitor) types. It would seem their results indicate, success with creating the problem with OLED, but IPS and VA, didn't show any such issues. Over a very long period of time, such as two years.
https://www.rtings.com/tv/learn/permanent-image-retention-burn-in-lcd-oled

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod