CTL display products are manufactured to rigorous standards. Our display products are consistently recognized as among the highest quality display products in the industry. Nevertheless, due to the nature of LCD technology, an LCD display may exhibit a small number of very small bright or dark spots on the screen.
Often, these spots are noticeable only when the screen continuously displays a certain solid color such as an all white or all black background. This type of background can be present when initially turning a computer on, or when a computer switches the display to a specific screen-saver. Occasionally, these spots can seem to appear when a user switches to a different desktop background image.
In actuality, these spots are pixels or sub-pixels that are stuck always on (viewable as a bright spot on a dark background) or always off (viewable as a dark spot on a light background). An LCD display is made up of ten's of thousands of individual pixels, and each pixel is made up of 3 individual sub-pixels (red, blue and green). In-fact, a 17" LCD has over 1,300,000 pixels and almost 4 million sub-pixels! Each sub-pixel is controlled by an individual transistor which turns the individual sub-pixel that it controls either on or off to create the image on your screen. An anomaly occurring during the manufacturing process can cause an individual transistor to continuously light or fail to light an individual pixel element, causing one of these small spots on the screen. Although this anomaly occurs relatively rarely in individual transistors, there are millions of sub-pixels on each LCD screen, and it is not uncommon for an LCD screen from any manufacturer to contain a few of these transistor anomalies and their associated bright or dark spots.
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For a manufacturer to sell only LCD's with no transistor anomalies would result in a prohibitive cost to you, the consumer…one many times higher than it is today. Most people and applications are tolerant of a small number of these transistor anomalies on an LCD screen, and prefer the lower cost of LCD's that existing standards allow.
While many manufacturers offer vague or confusing pixel policies, CTL's Defective Pixel Policy is among the best in the industry.
CTL sets simple & strict limits as to the allowable number of non-performing pixels or sub-pixels on our monitors and laptop computer screens. These criteria supplement our existing No HassleTM Warranty and are applicable during the warranty period as follows:
- For all CTL LCD Monitors: During the first 30 days after original purchase date, a customer can return an LCD Monitor with any non-performing pixels or sub-pixels to CTL for replacement under warranty.
- For all CTL LCD Monitors & Laptops: After 30 days from the original purchase date for all CTL LCD Monitors and at any time after the original purchase date for all CTL Laptops your LCD or Laptop will be replaced under warranty if it meets one of the following criteria:
- 12" - 17" LCD Screens: 2 lit, 2 unlit, or 4 colored non-performing pixels
- 19" & 20" LCD Screens: 4 lit, 4 unlit, or 7 colored non-performing pixels