Image quality LED vs LCD

[lukaz lukas]

I had this question on my mind,. why most wallpapers / images seem to be very noisy is it to do with type of monitor or how the image was taken?

I noticed LED monitors images appear less noisy then LCD monitors

 

[bignastyid]

LED monitors are still an LCD monitor. LED is just the type backlight the monitor uses. Older LCD monitors use ccfl backlights that use more power than leds. Image quality has to do with the type of LCD panel(TN, IPS, VA, etc) as well as other factors such as resolution.

 

[burdenbound]

LED and LCD are not mutually exclusive. LED refers to the type of backlighting while LCD refers to the monitor type. As far as noise goes, sounds like the quality of the original image would play a larger role. LED/LCD/OLED etc... will give you different levels of contrast and color quality but will not affect the content of the image.

 

[DeadRam]

LED TV's and monitors are not true LED devices. They are LCD displays that are backlit using LED's instead on fluorescent tubes. OLED is a true LED device.

 

[maxwellmelon]

because LCD monitors use floresnt tubes for the backlight. of course these have flickering. LED monitors use led which don't tend to flicker unless its a really cheap LED.

random fact most LED monitors are really just lies because yes they are led backlit but not every single pixel is a led like some people think.

 

[littleleo]

LED monitors are LCD monitors the LED refers to the backlighting. So LCD monitors come with the older cold cathode fluorescent lamps to provide backlighting, and the newer models use LEDs for backlighting which helps give you a crisper and better image. Both are LCD models so get the LED for better and sharper image quality. IMO.

 

[Solandri]

Most 8-bit panels (16.7 million colors) are actually 6-bit panels (262k colors). Modern panels make up the extra 2 bits using something called FRC. Basically, they rapidly flicker between the two colors they can show, to simulate the in-between color that they can't show. So if the panel is supposed to show Red 243, but because it's 6-bit it can only show R240 and R244, it will flicker between R240 and R244, showing R240 25% of the time, R244 75% of the time. Over time, that averages out to R243, and that's what your eye sees.

https://en.wikipedia.org/wiki/Frame_rate_control

LED and LCD monitors actually both use LCDs, but the LED monitors use a LED backlight. The LCD monitors use a CCFL (fluorescent lamp) backlight. That has some small implications for color, but isn't really relevant to the noise you're seeing. The important thing is that everyone switched to LEDs about 7 years ago. So LED monitors are newer than LCD monitors.

The newer LED monitors use newer panels whose pixels can change shades more quickly. So their FRC happens at a higher frequency where it's invisible to your eye (well, most people's eyes - a few of us are cursed with vision which lets us see fluorescent lights, LED car tail lights, even monitor backlights flicker at up to several hundred Hz).

Older LCD monitors use older, slower panels so their FRC happens at a lower frequency, and the pixels can look like they're noisy or (if your eye is moving) swimming/swirling. Or sometimes the panels were so slow they couldn't do FRC without it becoming terribly obvious, so they used spatial dithering instead. That's where nearby pixel colors are tweaked slightly so the average of (say) 4 pixels is the average of the 8-bit 4-pixel quad even though each individual pixel is displaying a 6-bit color. This sorta works in most real-world images, but becomes really obvious (noisy) in images with solid blocks of color or smooth gradients.
http://www.tftcentral.co.uk/featurescontent.htm#dithering

 

[Suzuki@1473780084@1473780163]

1. Screen coating, some are worse than others.

2. Yes, the light sensitivity (ISO) of the camera, size of sensor, etc all matter and contribute to a more or less noisy image. Post work included, heavy sharpening and other effects can bring out artifacts in the images or create new ones.

3. Monitor used, all 6 bit monitors aren't the same. IPS and VA are called 8 bit even at low price range because they handle gradients so well that you can't tell the difference. Same thing goes for TV's (HDR) being 8 bit with 10 bit FRC so well that it just works.

As far as contrast is concerned, there are LCD's with deep blacks industuingishable from OLED, but contrast still suffers. Although the amount of shadow detail you can bring out by just properly calibrating usually satisfies consumers more than enough. This is why OLED won't survive, since VA TV's at this point only real world worth arguing about are the viewing angles.