Robert at Apple Service & Support thought that you might find this article useful. We hope that it helps resolve your technical issue.

Link: http://www.info.apple.com/kbnum/n22194

About LCD display pixel anomalies

This document defines the term "pixel anomaly", explains why such anomalies occur, and describes what to do if you feel your active matrix LCD panel has more than an acceptable number of pixel anomalies.

Many Apple products use active-matrix LCD panels, including the iMac (Flat Panel), iBook, recent PowerBook computers, and Apple Cinema displays. In addition to being slim and light, active-matrix LCD technology provides customers with many visual performance advantages when compared to traditional cathode-ray tube- (CRT) based displays, such as increased brightness, sharpness, and contrast ratio. Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off.
There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million red, green, and blue subpixels. Occasionally, a tra nsistor does not work perfectly, which may result in the affected subpixel being turned on (bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low number of faulty transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered acceptable. Rejecting all but perfect LCD panels would significantly increase the retail price for products using LCD displays. These factors apply to all manufacturers using LCD technology--not just Apple products. If you suspect your display contains a high number of pixel anomalies, take your Apple product to an Apple Authorized Service Provider for closer examination. There may be a charge for the evaluation. Thank you, Apple

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If you still have questions, be sure to visit Apple's award-winning Service & Su pport site. You'll find tons of helpful technical articles, information, tutorials, product manuals, software updates, and more that will help you get the most out of your Apple product.

Got an iMac? iMac users can chat online with a live support agent, 24/7, on our iMac Support site. If you have an iMac G5, you can also get help from our Troubleshooting Assistant there too.
Need help with iPod or iSight? You'll find tutorials, troubleshooting, and technical articles about iPod and iSight on Apple's Support site. If you need replacement parts, follow the link on either page to fill out a Service Request Form. Get peace of mind Extend your product's complimentary support. Purchase an AppleCare Protection Plan today. Need help installing parts? Visit our Do-It-Yourself repair and upgrade page to find out how to install memory, AirPort cards, and other Apple-certified parts. Get help from a Genius Apple Stores worldwide feature a Genius Bar that's stocked with technology specialists who can answer your most pressing questions. Find an Apple Store near you. Join the community Meet, greet, and communicate with others about the Apple products you use. Visit Apple Discussions for help, tips, and insight from other Apple customers around the globe.

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Robert at Apple Service & Support thought that you might find this article useful. We hope that it helps resolve your technical issue.

Link: http://www.info.apple.com/kbnum/n22194

About LCD display pixel anomalies

This document defines the term "pixel anomaly", explains why such anomalies occur, and describes what to do if you feel your active matrix LCD panel has more than an acceptable number of pixel anomalies. Many Apple products use active-matrix LCD panels, including the iMac (Flat Panel), iBook, recent PowerBook computers, and Apple Cinema displays. In addition to being slim and light, active-matrix LCD technology provides customers with many visual performance advantages when compared to traditional cathode-ray tube- (CRT) based displays, such as increased brightness, sharpness, and contrast ratio. Active-matrix LCD technology uses rows and columns of addressable locations (pixels) that render text and images on screen. Each pixel location has three separate subpixels (red, green and blue) that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off. There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the Apple Cinema HD display is made up of 2.3 million pixels and 6.9 million red, green, and blue subpixels. Occasionally, a tra nsistor does not work perfectly, which may result in the affected subpixel being turned on (bright) or turned off (dark). With the millions of subpixels on a display, it is quite possible to have a low number of faulty transistors on an LCD. Therefore, a certain number of subpixel anomalies is considered acceptable. Rejecting all but perfect LCD panels would significantly increase the retail price for products using LCD displays. These factors apply to all manufacturers using LCD technology--not just Apple products. If you suspect your display contains a high number of pixel anomalies, take your Apple product to an Apple Authorized Service Provider for closer examination. There may be a charge for the evaluation. Thank you, Apple **This message has been auto-generated. Please do not reply to this email. Replies will be ignored. ---- If you still have questions, be sure to visit Apple's award-winning Service & Su pport site. You'll find tons of helpful technical articles, information, tutorials, product manuals, software updates, and more that will help you get the most out of your Apple product.

Got an iMac? iMac users can chat online with a live support agent, 24/7, on our iMac Support site. If you have an iMac G5, you can also get help from our Troubleshooting Assistant there too. Need help with iPod or iSight? You'll find tutorials, troubleshooting, and technical articles about iPod and iSight on Apple's Support site. If you need replacement parts, follow the link on either page to fill out a Service Request Form. Get peace of mind Extend your product's complimentary support. Purchase an AppleCare Protection Plan today. Need help installing parts? Visit our Do-It-Yourself repair and upgrade page to find out how to install memory, AirPort cards, and other Apple-certified parts. Get help from a Genius Apple Stores worldwide feature a Genius Bar that's stocked with technology specialists who can answer your most pressing questions. Find an Apple Store near you. Join the community Meet, greet, and communicate with others about the Apple products you use. Visit Apple Discussions for help, tips, and insight from other Apple customers around the globe.

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