led tv uneven backlight image
Steve
im loooking at tv`s that have 60htz, 120,240. what is the benefits of a higher htz unit? and why is LED apparently better than a non-LED unit? Thanks in advance all you wonder answering folks!
Answer
LED backlighting lasts longer than cathode tube (fluorescent) backlighting in LCD TVs, but both are pretty close in energy efficiency and will generally cost less to operate than plasma TVs. Plasmas are capable of the best black levels, so they tend to also be rated the best for picture quality.
If an LCD display has an LED grid array of lights that is ALSO capable of local dimming, then that TV is capable of recreating dark scenes better than a TV with either LED edge lighting or cathode backlighting. That is because sections of the LED backlight grid can be individually dimmed to accommodate dark areas that appear within a scene.
Edge lit LCD and cathode backlights always stay on at the same level no matter how dark or bright a scene is, and that limits how dark a night or outerspace scene can look. LED edge lighting is primarily used to create a thinner TV, and it can result in uneven lighting across the display, noticed mostly in the corners during dark scenes.
Refresh rates have been getting increased on displays to:
- decrease the appearance of motion blur during fast motion on LCD TVs
- allow even multiplication of the frame rates of 60Hz and 24Hz video source material (they both divide evenly into 120 and 240Hz, but not 60Hz)
- allow the use of motion interpolation by the TV (it makes filmed material look more like smooth, live video, but it can be disabled if you prefer)
- allow the display of 3D material on 3D TVs, which have to show twice as many frames as 2D displays do
I learned a great deal about TV technology at Cnet, you can find their tech articles and TV reviews here: http://reviews.cnet.com/televisions/ .
LED backlighting lasts longer than cathode tube (fluorescent) backlighting in LCD TVs, but both are pretty close in energy efficiency and will generally cost less to operate than plasma TVs. Plasmas are capable of the best black levels, so they tend to also be rated the best for picture quality.
If an LCD display has an LED grid array of lights that is ALSO capable of local dimming, then that TV is capable of recreating dark scenes better than a TV with either LED edge lighting or cathode backlighting. That is because sections of the LED backlight grid can be individually dimmed to accommodate dark areas that appear within a scene.
Edge lit LCD and cathode backlights always stay on at the same level no matter how dark or bright a scene is, and that limits how dark a night or outerspace scene can look. LED edge lighting is primarily used to create a thinner TV, and it can result in uneven lighting across the display, noticed mostly in the corners during dark scenes.
Refresh rates have been getting increased on displays to:
- decrease the appearance of motion blur during fast motion on LCD TVs
- allow even multiplication of the frame rates of 60Hz and 24Hz video source material (they both divide evenly into 120 and 240Hz, but not 60Hz)
- allow the use of motion interpolation by the TV (it makes filmed material look more like smooth, live video, but it can be disabled if you prefer)
- allow the display of 3D material on 3D TVs, which have to show twice as many frames as 2D displays do
I learned a great deal about TV technology at Cnet, you can find their tech articles and TV reviews here: http://reviews.cnet.com/televisions/ .
Any color differences between standed PC cable vs. DVI cable?
MoMo RC
I'm a pro photographer and am in the late stages of finishing my website. I want to make sure I'm getting true colors that display very simular on other peoples screens. I previously was using the regular plug with the blue plug-in to the screen.
I was on my friends mac and i notced it was very bright and the colors on my photos on my website were more saturated. Is this just my screen or what?
should my new DVI cable get me true colors when i edit my work?
Answer
A VGA cable carries analog video signal, and as such is theoretically capable of an unlimited number of colors. DVI is a digital signal and has a finite number of colors, but it's more than adequate for what most computers use (32-bit color).
Color accuracy will depend more on the display than the video cable. Really, only in the case of NTSC composite or separate Y/C video is color shift ever an issue, and to correct that, our TVs have a tint adjustment. As long as the connection is firm and the cable has adequate shielding (most do), color fidelity should be a non-issue.
Everybody's monitor is adjusted differently, so the end result is that different users will be seeing colors a bit differently. CRT, LCD, and LED-backlit monitors all display colors differently. Users with older monitors may have had uneven wear, and as such some colors show up better than others on their individual monitors. Some may be using a temperature color of 5000K while others use 6500K or 9300K.
But if color fidelity is truly an issue, your best bet is to upgrade your display. When it comes to color fidelity, the phosphor-based displays do it best. Plasma is often too big, expensive, and prone to burn-in for computer usage and photo editing, but the trusty old CRT is a favorite among video editors and graphics designers alike. LED-backlit LCD monitors (misleadingly called LED monitors) do a fairly good job at color reproduction, but not as good as CRT or plasma. LCD monitors come in dead last, with their poor black levels and contrast ratios and sometimes-distorted colors due to the fluorescent backlight.
A VGA cable carries analog video signal, and as such is theoretically capable of an unlimited number of colors. DVI is a digital signal and has a finite number of colors, but it's more than adequate for what most computers use (32-bit color).
Color accuracy will depend more on the display than the video cable. Really, only in the case of NTSC composite or separate Y/C video is color shift ever an issue, and to correct that, our TVs have a tint adjustment. As long as the connection is firm and the cable has adequate shielding (most do), color fidelity should be a non-issue.
Everybody's monitor is adjusted differently, so the end result is that different users will be seeing colors a bit differently. CRT, LCD, and LED-backlit monitors all display colors differently. Users with older monitors may have had uneven wear, and as such some colors show up better than others on their individual monitors. Some may be using a temperature color of 5000K while others use 6500K or 9300K.
But if color fidelity is truly an issue, your best bet is to upgrade your display. When it comes to color fidelity, the phosphor-based displays do it best. Plasma is often too big, expensive, and prone to burn-in for computer usage and photo editing, but the trusty old CRT is a favorite among video editors and graphics designers alike. LED-backlit LCD monitors (misleadingly called LED monitors) do a fairly good job at color reproduction, but not as good as CRT or plasma. LCD monitors come in dead last, with their poor black levels and contrast ratios and sometimes-distorted colors due to the fluorescent backlight.
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Title Post: what is the difference in quality, electrical usage and quality of picture in televisions? why is LED more $?
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