HP L1745 Understanding pixel defects in TFT flat panel monitors
HP L1745 - 17" LCD Monitor Manual
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UPC - 883585080953
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HP L1745 manual content summary:
- HP L1745 | 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 L1745 | Understanding pixel defects in TFT flat panel monitors - Page 2
today's high-quality flat panel displays deliver crisp, clear visual quality at a reasonable price. Even so, some LCD monitors may harbor tiny this paper. Why is this important to me? Doing business with HP gives you the advantage of dealing with a company that strives to consistently deliver - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 3
natural state. When used in computer displays, this material is enclosed between two pieces of glass (in a flat panel display) and an image is generated by controlling the alignment of the LC molecules electrically, causing them to effectively act as "light valves"-letting light either pass through - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 4
state of the sub-pixel while the panel drivers take care of the other rows and columns of the display. This results in a great improvement in the contrast and response time possible with LCD technology, and permits the manufacture of largesize, high-resolution displays which rival any other display - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 5
screen green panels not have any complete 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 - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 6
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 defects in flat panel monitors: Class 0 panels are completely defect-free, including no full pixel or sub-pixel defects. Class 1 panels permit any - HP L1745 | 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 L1745 | Understanding pixel defects in TFT flat panel monitors - Page 8
: When the unit lights, variation/non-uniformity (splotchiness) appears light (white) with the display and might vary in size. Newton ring: A "rainbow" effect caused by non-uniform cell thickness. Pixel: A picture element made up of three primary color sub-pixels (red, green, and blue), which - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 9
operation out of the box. Engineering excellence: HP quality does not stop at the factory door. Our service and engineering teams continue to support each unit throughout its lifecycle. The award-winning HP call center quickly resolves most issues on the first call. Designed with the environment - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 10
easily disassembled at the end of the product life to aid in recovery of recyclable components. CFC-free: Both HP and its suppliers use only CFC-free processes to protect the ozone layer from further damage. HP service and support HP LCD monitors are protected under the industry-leading HP support - HP L1745 | Understanding pixel defects in TFT flat panel monitors - Page 11
Asia Pacific Ltd. Hewlett-Packard Hong Kong Ltd. 19/F, Cityplaza One 1111 King's Road Taikoo Shing Hong HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP
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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
......................................................................
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
........................................................................
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
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11