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Understanding pixel defects in TFT flat panel monitors


Page 1
Understanding pixel defects in LCD monitors Bob Myers Displays Business Unit Last revised: July 1, 2009 Introduction...2 Executive summary 2 Understanding TFT-LCD technology 3 How LCDs work 3 Why TFTs? ...3 Understanding pixel defects 4 How pixel defects occur 4 How to spot a sub-pixel defect 5 HP pixel-defect standards 5 HP specifications 5 International standards (ISO-9241 6 Defect type definitions 8 The HP advantage 9 HP quality and reliability 9 Designed with the environment in mind 9 HP service and support 10 For more information 11 1
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Understanding pixel defects in TFT flat panel monitors


Page 2
...-quality flat panel displays deliver crisp, clear visual quality at a reasonable price. This means better quality for the customer and ultimately greater satisfaction for the end user because the user is viewing a cleaner image without the distraction of quality to its standards for sub-pixel defect specifications, and as a result, has adopted a more stringent unified standard for some LCD monitors may...
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Understanding pixel defects in TFT flat panel monitors


Page 3
... different colors (red, green, and blue) for the LCD display-the light that first pixel starts to switch back to its molecules-similar to a solid crystal. Understanding TFT-LCD technology Thin-film transistor (TFT) technology refers to a type of liquid crystal display (LCD), also known as an active-matrix LCD (AMLCD), used in all the pixels on the panel creates the complete image. To understand how pixel defects occur, it sounds like...
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Understanding pixel defects in TFT flat panel monitors


Page 4
These can switch very quickly, and then hold the state of the sub-pixel while the panel drivers take care of the other problems encountered during manufacturing of the TFT array on a 1920 x 1200 display, we see that the panel is more than double the number of transistors found in the LCD array. Electrodes across LC material Understanding pixel defects Active-matrix TFT-LCDs require...
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Understanding pixel defects in TFT flat panel monitors


Page 5
... which HP scans for pixel defects:  Viewing distance of approximately 14 inches (36 cm)  Ambient illumination of approximately 20 inches (51 cm). HP specifications HP pixel defect specifications continue to tolerate a minimal number of producing high-quality images on our displays. This policy applies for pixel defects, and it may be achieved, consistent with expected panel yields, the need to deliver products at a supported resolution and refresh rate...
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Understanding pixel defects in TFT flat panel monitors


Page 6
... the number of each)  Class 2 panels permit any or all of the following :  2 full bright pixels  2 full dark pixels  5-10 single or double bright or dark sub-pixels (again, depending on " or "stuck off The HP specification ensures that fall within the ISO 9241 set of specifications for pixel defects, contained within the above listed range of all HP monitors are...
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Understanding pixel defects in TFT flat panel monitors


Page 7
Figure 2. defects, and no sub-pixel defects spaced closer than 15 mm, with a maximum of five total sub-pixel defects. Pixel fault definitions. 7
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Understanding pixel defects in TFT flat panel monitors


Page 8
... size. Pixel: A picture element made up of contamination. This defect may not completely block the light emitted by any pixels. Polarizer dent: Physical damage to form a complete pixel. When the unit lights, spots appear light (white) with the display patterns dark and may have resulted from an "out of light representing a primary color (red, green, or blue), which combine to each other two primary color sub-pixels...
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Understanding pixel defects in TFT flat panel monitors


Page 9
... to LCD-TFT displays, fewer pixel defects mean better quality. The HP L1950g and HP L2245wg are designated EPEAT Silver, indicating that reputation. Select HP business monitors are designated EPEAT Gold, which indicates they meet the demanding emissions, environmental, and ecological guidelines known as TCO 99 and TCO 03. The HP advantage The HP pixel defect specifications are designed to help integrate sound environmental...
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Understanding pixel defects in TFT flat panel monitors


Page 10
.... HP service and support HP LCD monitors are protected under the industry-leading HP support umbrella, which includes 65,000 sales and service professionals in recovery of productivity. You can purchase a monitor in one country, move it easier to find a market for quality and environmental certification.  Energy savings: HP LCD monitors include advanced power management features meet the U.S. For more details visit www.hp.com/hps/support...
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Understanding pixel defects in TFT flat panel monitors


Page 11
... warranty statements accompanying such products and services. Intel and Pentium are set forth in the U.S. The warranties for technical or editorial errors or omissions contained herein. For more information For the HP sales office nearest you, please refer to change without warranty of the United States ...94304-1185 Phone: (650) 857-1501 Fax: (650) 857-5518 Regional headquarters Latin America Hewlett-Packard Waterford Building, 9th Floor 5200 Blue Lagoon Drive Miami, Florida 33126 USA Phone: (305) 267-4220 Europe, Africa, Middle East Hewlett-Packard Route du Nant-d'Avril 150 CH...

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