HP LP1965 Understanding pixel defects in TFT flat panel monitors
HP LP1965 - Promo LCD Monitor Manual
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HP LP1965 manual content summary:
- HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 1
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 - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 2
, clear visual quality at a reasonable price. Even so, some LCD monitors may harbor tiny defects due to the screen, producing the mixture of color and detail that forms the sharp, vibrant images flat panel users have come to expect. How do pixel and sub-pixel defects occur? The HP specification - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 3
LCD), also known as an active-matrix LCD (AMLCD), used in all HP LCD monitors as well as HP iPAQ devices and HP the light evenly across the screen. Why TFTs? In the simplest LCD technology, the voltage applied the contrast, resolution, and the response time that can be achieved with such a simple, - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 4
the average AMLCD an enormously complex device. For example, producing one of today's high-resolution WUXGA displays. with a 1920 x 1200 pixel native format requires embedding nearly seven million transistors in the screen (1920 x 1200 x 3 = 6.91 million). This is more than double the number of - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 5
pixel defects (i.e., all three sub-pixels defective), HP customers are not likely to encounter this situation. To locate defective sub-pixels, the monitor should be viewed under normal operating conditions, in normal operating mode at a supported resolution and refresh rate, from a distance of - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 6
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-pixel defect. Most remaining - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 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. 7 - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 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 - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 9
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 better 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 - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 10
160 countries around the world who provide an impressive depth of service and support at the local level. All HP LCD monitors come with a three-year limited global warranty on parts and labor, including the backlight. You can purchase a monitor in one country, move it to another country, and receive - HP LP1965 | Understanding pixel defects in TFT flat panel monitors - Page 11
Kong Ltd. 19/F, Cityplaza One 1111 King's Road Taikoo Shing Hong Kong © 2005-2009 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice and is provided "as is" without warranty of any kind. The warranties for HP products and services are set
1
Understanding pixel
defects in LCD
monitors
Bob Myers
Displays Business Unit
Last revised: July 1, 2009
Introduction
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2
Executive summary
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2
Understanding TFT-LCD technology
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3
How LCDs work
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3
Why TFTs?
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3
Understanding pixel defects
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4
How pixel defects occur
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4
How to spot a sub-pixel defect
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5
HP pixel-defect standards
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5
HP specifications
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5
International standards (ISO-9241)
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6
Defect type definitions
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8
The HP advantage
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9
HP quality and reliability
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9
Designed with the environment in mind
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9
HP service and support
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10
For more information
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