WHY does the yellowing of the LCD happen? Anybody with knowledge?

[PDE]

The yellow tint issue with the LED displays has still not been addressed and people keep getting defective displays with just 1/4 or 1/3 of the display showing a yellowish tint. I'm wondering if anybody around here actually knows the cause of this issue and why it seems so difficult for Apple to fix?

It's not like Apple's LCD manufacturers are subpar - they're the big names in the business: LG, Samsung, AUO etc. So what's the problem? Surely these large manufacturers must have seen this before they released their products? And surely there must be a solution??

Anybody able to explain what's actually happening, on a technical level?

Thanks!

 

[Apple Corps]

PDE - excellent question, I've wondered the same. My 2.33 C2D 15" with CCFL backlight continues to be perfect - the LED backlight still has some bugs that even the "big boys" can't figure out how to resolve.

 

[zeiter]

I guess it depends on the manufacturer...some do have it (samsung), some dont. I just dont understand why there is no "return" process in those case. For example, why Apple can't return the defective one to Samsung and get newer ones instead of letting people buy a 2000 dollars laptop with this problem. This is beyond me and it proves that corporations dont give a damn about costumer quality. This yellow problem really stops me from clicking "buy now"....I don't know what I will do. Any advice?

 

[chp5592]

I've had my glossy screen penryn MBP 2.4 for several days now. I don't see any yellowing issues when at normal viewing angles.

Now if I look from far right, left, up, or down (i.e. greater than 135 degrees, normal straight on being 90 degrees), the screen has a yellowish tint. But, these angles are NOT physiologic angles. I suspect it has to do with the LED white light spectrum is not quite perfect when mated to the traditional LCD panel technology.

Not an issue with my computer which I love. Very quiet and COOL...

 

[chinarider]

The yellow tint issue with the LED displays has still not been addressed and people keep getting defective displays with just 1/4 or 1/3 of the display showing a yellowish tint. I'm wondering if anybody around here actually knows the cause of this issue and why it seems so difficult for Apple to fix?

It's not like Apple's LCD manufacturers are subpar - they're the big names in the business: LG, Samsung, AUO etc. So what's the problem? Surely these large manufacturers must have seen this before they released their products? And surely there must be a solution??

Anybody able to explain what's actually happening, on a technical level?

Thanks!

Are we talking LEDs or LCDs? I thought it was just on the LEDs.

 

[Apple Corps]

This posting relates to LCD screens with LED backlighting.

 

[PDE]

Are we talking LEDs or LCDs? I thought it was just on the LEDs.

The LED-backlit LCDs. It's not really an issue when the entire display has a slight yellowish tint because that can be calibrated and mostly fixed. The issue is only when the lower portion is yellowing and the upper part has normal color rendition.


With LED technology are the backlights still located at the bottom? If that's the case, then maybe it's a problem with how the light is diffused? It's strange to me that only the part closest to the backlights is affected - why isn't the rest as yellow? But I really don't know much/anything about the technology so...

Questions...questions...

 

[Apple Corps]

PDE - my guess (not knowledge) is along the same lines as your thinking. The light waves from an LED may be far more coherent than that produced from a CCFL - perhaps there is an issue with the angle at which such waves interact with the lcd cells - chp5592 may be on the same path.