What is the reason...

[gsellis]

The TV also has very poor dpi and the same contrast issues. Mouse type in books can do the same thing over a period.

 

[BFG10K]

Let's not forget that a lot of people don't experience eye strain on CRTs and that some in fact experience it on LCDs instead.

 

[Tab]

Originally posted by: BFG10K
Let's not forget that a lot of people don't experience eye strain on CRTs and that some in fact experience it on LCDs instead.

Well, science tells me thats not true. Anyway, the majority has less eyestrain on LCDs.

 

[dpopiz]

I too say refresh rate is the most important part. different people can notice different speeds of flickering. my eyes are particularly sensitive to it, so much so that I have to go up to 100Hz before I don't see flickering looking straight at it, and I can still see flickering with my peripheral vision.

BUT remember that the higher the refresh rate, the more video bandwidth -> the screen will probably have slightly worse focus. you should only do a very high refresh rate if you have a very nice monitor (like my samsung 700IFT). if your monitor gets blurry with the higher refresh, you might get less eyestrain from the lower refresh+better focus.

 

[Sahakiel]

Originally posted by: Tabb

So, since the image isn't changing as much it is easier on our eyes to focus on them? Our minds don't realize that the image is change every second, but our eyes do? I am not sure if I understand all of that above. Maybe I do? Hertz is just a cycle? What happens when we change the refresh rates on our LCDs? What does that do? Also, if 60Hz is the default for our moniters, why is that? I don't really understand electricity that much either.

The human eye does a lot of preprocessing before the image data is sent to the visual cortex.

 

[AEB]

From what i understand ( yes i am aware someone answerd similarily to this) CRTS refresh where LCD's do not, the image is just repalced on LCD's. Thats why they have a response time and nota refresh rate. Refresh rate really only applies to CRT's. Your eyes get tired looking at crts because you get image, black, image, black. Your eyes noticed it even if your brain doesnt process it. So long answer short strain.

 

[Tab]

Originally posted by: AEB
From what i understand ( yes i am aware someone answerd similarily to this) CRTS refresh where LCD's do not, the image is just repalced on LCD's. Thats why they have a response time and nota refresh rate. Refresh rate really only applies to CRT's. Your eyes get tired looking at crts because you get image, black, image, black. Your eyes noticed it even if your brain doesnt process it. So long answer short strain.

No, thats not right. When I change my refresh rate in the control panel their is a difference. Not to mention my LCD displays information for Vertical and Horzontal Refresh Rates.

 

[glugglug]

A CRT refreshes a pixel immediately when the signal is sent through the VGA cable for that specific pixel.

A LCD buffers the entire image in memory, and keeps displaying it totally independent from getting a new image sent through the video cable. So changing the refresh rate in your display control panel does NOT affect the actual refresh rate of an LCD. The reason you would see a difference there is if it is an analog signal and the monitor doesn't process the sync exactly the same at the different signaling rates.

BTW I've seen Eizo LCDs flicker badly, worse than a cheap CRT, when fed an analog input signal. They are really made for DVI and the analog circuits in most LCDs are not that great.

 

[BFG10K]

Well, science tells me thats not true.

How exactly does it do that?

Your eyes get tired looking at crts because you get image, black, image, black

They don't turn black; they turn into whatever the new image is.

 

[Tab]

Originally posted by: BFG10K

Well, science tells me thats not true.

How exactly does it do that?

Read the entire thread 😉