HP LP2275wの取扱説明書・マニュアル [全11ページ 2.56MB]

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1 Understanding pixel defects in LCD monitors Bob Myers Displays Business Unit Last revised: July 1, 2009 Introduction ................................ ................................ ................................ ......... 2 Executive summary ....

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2 Introduction Liquid crystal display (LCD) technology was first invented decades ago and has been improving ever since -to the point that today's high -quality flat panel displays deliver crisp, clear visual quality at a reasonable price. Even so, some...

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3 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 HP LCD monitors as well as HP iPAQ devices an d HP notebook displays. To ...

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4 The advent of thin -film trans istor (TFT) technology allowed transistors to be placed at each picture element or sub -pixel. These can switch very quickly, and then hold the state of the sub -pixel while the panel drivers take care of the other rows and...

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5 How to spo t a sub -pixel defect Due to their tiny size relative to the screen, defective sub -pixels can be extremely hard to see. A defect in a sub -pixel is, visually, a single, tiny spot that is so small, it may be visible only if you display it aga...

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6 Table 2 . This policy applies for HP monitors manufactured in May 2009 or later: Bright sub -pixel defects: 2 maximum Dark sub -pixel defects: 5 maximum Total sub -pixel defects: 5 maximum Full pixel defects: 0 allowed Note: the date of...

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7 defects, and no sub -pixel defects spaced closer than 15 mm, with a maximum of five total sub -pixel defects. Figure 2. Pixel fault definitions.

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8 Defect type definitions Bright/dark dot : A sub -pixel stuck on or off. Bright spots/lines : Spots or lines that appear light in the display. Defects do not vary in size or intensity (contrast) when contrast voltage is varied. Contrast variation can b...

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9 The HP advantage The HP pixel defect specifications are part of HP's ongoing effort to provide high quality products. When it comes to LCD -TFT displays, fewer pixel defects mean bett er quality. HP quality and reliability HP prides itself on a re...

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10 Development, the world's leading organization for quality and environme ntal certification.  Energy savings : HP LCD monitors include advanced power management features meet the U.S. Environmental Protection Agency's ENERGY STAR(R) requirements.  ...

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11 For more information For the HP sales office nearest you, please refer to your local phone directory, or call the HP regional office listed below. Corporate and North American headquarters Hewlett -Packard 3000 Hanover Street Palo Alto, CA 94304 -...