which components actually "age" (and the need for recailbration) - AVS Forum
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post #1 of 10 Old 09-20-2013, 09:36 AM - Thread Starter
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With CRTs I can understand that the emmissiveness of the electron guns can change over time, and hence the need for recalibration. I suppose incremental phosphor decay also has an impact.

But what about high end LCD tv sets, or DLPs? What kind of changes occur to components that would necessitate a periodic calibration?
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post #2 of 10 Old 09-20-2013, 10:01 AM
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Greetings

The light bulb changes color as it ages.

regards

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post #3 of 10 Old 09-20-2013, 10:04 AM - Thread Starter
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ah I see, makes sense. Thanks for the response - and for your great site, which I've been devouring over the last few days smile.gif
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post #4 of 10 Old 09-20-2013, 10:41 AM
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Polarizers degrade ... "Organic" components degrade ... although these aren't as much of a problem with modern LCDs as they once were. OTOH, The jury hasn't even been seated on OLED yet ... stay tuned.
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post #5 of 10 Old 09-20-2013, 02:38 PM
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Quote:
Originally Posted by HDTVChallenged View Post

Polarizers degrade ... "Organic" components degrade ... although these aren't as much of a problem with modern LCDs as they once were. OTOH, The jury hasn't even been seated on OLED yet ... stay tuned.

From everything I've read, managing the aging on OLEDs is the number 1 problem with the technology.
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post #6 of 10 Old 09-20-2013, 06:20 PM
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I remember reading many years back that the blue OLEDs seemed to have the shortest lifespan
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post #7 of 10 Old 09-21-2013, 06:33 AM
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Scotti is right on the money.
The # 2 problem is viewing angle issues.

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post #8 of 10 Old 09-21-2013, 06:33 AM
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# 3 is burn in.

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post #9 of 10 Old 09-21-2013, 09:43 AM - Thread Starter
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I recently summarized a research review of the Sony PVM-2541 (OLED). The paper itself is open access. and can be found here. My brief summary is here.

While they didn't discuss burn in, the manual says:
Quote:
Due to an OLED’s panel structure and characteristics of materials in its design, displaying static images for extended periods, or using the unit repeatedly in a high temperature/high humidity environments may cause image smearing, burn-in, areas of which brightness is permanently changed, lines, or a decrease in overall brightness. In particular, continued display of an image smaller than the monitor screen, such as in a different aspect ratio, may shorten the life of the unit.
Avoid displaying a still image for an extended period, or using the unit repeatedly in a high temperature/high humidity environment such an airtight room, or around
the outlet of an air conditioner.

To prevent any of the above issues, we recommend reducing brightness slightly, and to turn off the power whenever the unit is not in use.

and even on their top of the line OLED, the BVM E250, from the manual:
Quote:
Due to the characteristics of the material used in the OLED panel for its high-precision images, permanent burn-in may occur if still images are displayed in the same position on the screen continuously, or repeatedly over extended periods.

Images that may cause burn-in

• Masked images with aspect ratios other than 16:9
• Color bars or images that remain static for a long time
• Character or message displays that indicate settings or
the operating state
• On-screen displays such as center markers or area
markers

To reduce the risk of burn-in

• Turn off the character and marker displays
Press the MENU button to turn off the character displays. To turn off the character or marker displays of the connected equipment, operate the connected equipment accordingly. For details, refer to the operation manual of the connected equipment.
• Turn off the power when not in use
Turn off the power if the viewfinder is not to be used for
a prolonged period of time.

Screen saver

This product has a built-in screen saver function to reduce burn-in. When an almost still image is displayed for morethan 10 minutes, the screen saver starts automatically and the brightness of the screen decreases.
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post #10 of 10 Old 09-21-2013, 09:48 AM
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From my experience so far...

The LG OLED does color shift at an angle, but the blacks do not turn gray like a traditional LCD panel. I started doing some digging and it appears that the color shift is due to the 4th white subpixel. It appears that the Samsung does not have this but I have yet to lay my eyes on one.
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