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HP w1907 の使い方、故障・トラブル対処法

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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 ................................ ................................ ............................. 2 Understanding TFT -LCD technology ................................ ................................ ...... 3 How LCDs work ...................................
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 manufacture is on the label on the back of the HP monitor. As a result of these tight specifications, the majority of all HP monitors are shipping with no pixel defects at all (per HP's internal audits), and a small percentage with only a single sub -pi...
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 LCD monitors may harbor tiny defects due to the extreme complexity of the manufacturing process. To deal with these inevitable minor flaws, HP has developed a set of policies and detection me thods to help ensure that each customer receives the highest qu...
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 columns of the display. This resu lts in a great improvement in the contrast and response time possible with LCD technology, and permits the manufacture of large -size, high -resolution displays which rival any other display technology in performance. ...
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 be achieved through the use of varying gray shade patterns. This defect may not completely block the light emitted by any pixels. Cluster : A group of defective sub -pixels which are in close proximity to each other. Cross lines off : When the unit light...
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 understa nd how pixel defects occur, it helps to understand the technology behind this type of LCD. How LCDs work A liquid crystal is exactly what it sounds like: a fluid substance which also exhibits some properties -such as an or dered arrangement of...
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.
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 reputation for industry -standard best -of-breed products -and our line of LCD monitors is a testament to that reputation. HP quality and reliability helps reduce maintenance, repair, and support c osts throughout the monitor lifecycle and result in a high...
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 against a background that specifically contrasts with the defective sub -pixel hue. Because they appear brighter to the human eye, defective green sub -pixels may be easier to spot than defective red or blue ones. Sub -pixel defects are also easier to spot...
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.  Recyclability : Commonly recycled materials are easily identified, making it easier to find a market for discarded components.  Packaging : Packaging consists of recyclable materials, no heavy metal inks, and minimal packaging material.  Disasse...
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