TOPIC This article defines the term "pixel anomaly", explains why one may occur, and tells what to do if you feel your active matrix LCD panel has more than an acceptable number of pixel anomalies.
DISCUSSION
A number of Apple products use an active matrix LCD panel, including: A pixel stuck either on or off is known as a pixel anomaly. A small number of pixel anomalies is acceptable. An active matrix color LCD panel contains three sub-pixels (red, green, blue) to generate one pixel on the display. Therefore, there can be over 2.3 million sub-pixels on a higher resolution LCD panel. Each subpixel has a corresponding transistor that is responsible for turning that subpixel on or off. A faulty transistor results in a subpixel anomaly. Of 2.3 million transistors, having a single or a few bad transistors is certainly possible. Due to current manufacturing methods, a certain number of subpixel anomalies (a pixel stuck on or off) is considered acceptable. Because the manufacturing yield of perfect active matrix panels is very low, displays may have some subpixels that are either always on or always off. The cost of accepting only perfect displays could nearly double the price of a product using an LCD display. This is true of all computer products using LCD technology, not just Apple products. If you suspect your display contains a high number of pixel anomalies, call Apple technical support, or take your Apple product to an Apple Authorized Service Provider for closer examination. Note: You may be charged for this evaluation. Notes:
2. All iBook computers have an active matrix display. |
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| Document Information | |
| Product Area: | Apple General Information |
| Category: | Product Information |
| Sub Category: | General Topics |
| Keywords: | kibook, kpbfw, kpbg3, kpbook, hts |
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