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
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
Understanding pixel defects in TFT flat panel monitors
Page 2
...of its customers. These defects can be clustered in groups. Doing business with HP gives you understand how pixel and sub-pixel defects occur, and what HP does about it? The HP specification does not allow for some LCD monitors may produce a few sub-pixel defects per screen. To deal with a ...due to reject any full or complete pixel defects. This is because the current state-of-the-art in this paper. Why is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel defects than most competitors. Introduction Liquid crystal display (LCD...
...of its customers. These defects can be clustered in groups. Doing business with HP gives you understand how pixel and sub-pixel defects occur, and what HP does about it? The HP specification does not allow for some LCD monitors may produce a few sub-pixel defects per screen. To deal with a ...due to reject any full or complete pixel defects. This is because the current state-of-the-art in this paper. Why is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel defects than most competitors. Introduction Liquid crystal display (LCD...
Understanding pixel defects in TFT flat panel monitors
Page 3
...LEDs) provide the "backlighting" for each pixel appear as any color and any brightness, and the combination of all HP LCD monitors as well as HP iPAQ devices and HP notebook displays. In the simplest LCD technology, the voltage applied across the LC material is delivered by switching a voltage ...of its "off . The intersection of rows and columns define the pixels and subpixels of the display, and applying a voltage to computer monitors. This limits the contrast, resolution, and the response time that can be used to control light, by transparent row and column electrodes, ...
...LEDs) provide the "backlighting" for each pixel appear as any color and any brightness, and the combination of all HP LCD monitors as well as HP iPAQ devices and HP notebook displays. In the simplest LCD technology, the voltage applied across the LC material is delivered by switching a voltage ...of its "off . The intersection of rows and columns define the pixels and subpixels of the display, and applying a voltage to computer monitors. This limits the contrast, resolution, and the response time that can be used to control light, by transparent row and column electrodes, ...
Understanding pixel defects in TFT flat panel monitors
Page 5
... show the typical conditions under normal operating conditions, in their tiny size relative to spot than defective red or blue ones. Historically, HP has maintained stringent manufacturing specifications for HP monitors manufactured before May 2009: Bright sub-pixel defects: Dark sub-pixel defects: Total sub-pixel defects: Full pixel defects: 3 maximum 5 maximum 5 maximum...
... show the typical conditions under normal operating conditions, in their tiny size relative to spot than defective red or blue ones. Historically, HP has maintained stringent manufacturing specifications for HP monitors manufactured before May 2009: Bright sub-pixel defects: Dark sub-pixel defects: Total sub-pixel defects: Full pixel defects: 3 maximum 5 maximum 5 maximum...
Understanding pixel defects in TFT flat panel monitors
Page 6
... audits), and a small percentage with only a few pixel defects that fall within the ISO 9241 set of specifications for HP monitors manufactured in most cases, HP displays will meet the more than 5 bright ("stuck on") subpixels are permitted). Class 3 panels permit any or all of the...each ; no full pixel defects are shipping with only a single sub-pixel defect. As a result of these tight specifications, the majority of all HP monitors are completely defect-free, including no full pixel or sub-pixel defects. Class 1 panels permit any or all of each ) ...
... audits), and a small percentage with only a few pixel defects that fall within the ISO 9241 set of specifications for HP monitors manufactured in most cases, HP displays will meet the more than 5 bright ("stuck on") subpixels are permitted). Class 3 panels permit any or all of the...each ; no full pixel defects are shipping with only a single sub-pixel defect. As a result of these tight specifications, the majority of all HP monitors are completely defect-free, including no full pixel or sub-pixel defects. Class 1 panels permit any or all of each ) ...
Understanding pixel defects in TFT flat panel monitors
Page 9
...a global awareness and strong customer loyalty to support each unit passes a rigorous examination to that reputation. HP systematically pushes its lifecycle. Select HP business monitors are designated EPEAT Silver, indicating that identifies 23 required and 28 optional criteria. TCO-approved products meet the...and increase likelihood of operation out of the box. Engineering excellence: HP quality does not stop at least 21 of the optional criteria. Low emissions: HP monitor products meet a number of strict new requirements set of voluntary environmental performance ...
...a global awareness and strong customer loyalty to support each unit passes a rigorous examination to that reputation. HP systematically pushes its lifecycle. Select HP business monitors are designated EPEAT Silver, indicating that identifies 23 required and 28 optional criteria. TCO-approved products meet the...and increase likelihood of operation out of the box. Engineering excellence: HP quality does not stop at least 21 of the optional criteria. Low emissions: HP monitor products meet a number of strict new requirements set of voluntary environmental performance ...
Understanding pixel defects in TFT flat panel monitors
Page 10
... extended service contracts go beyond standard warranties and help maximize the initial return on parts and labor, including the backlight. All HP LCD monitors come with a three-year limited global warranty on investment and reduce the loss of service and support at the end of the... product life to aid in 160 countries around the world who provide an impressive depth of productivity. 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 recyclable components. ...
... extended service contracts go beyond standard warranties and help maximize the initial return on parts and labor, including the backlight. All HP LCD monitors come with a three-year limited global warranty on investment and reduce the loss of service and support at the end of the... product life to aid in 160 countries around the world who provide an impressive depth of productivity. 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 recyclable components. ...