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
... defects occur? This means better quality for the customer and ultimately greater satisfaction for some LCD monitors may produce a few sub-pixel defects per screen. Introduction Liquid crystal display (LCD) technology was first invented decades ago and has been improving ever since-to its standards ...is because the current state-of policies and detection methods to reject any full or complete pixel defects. Executive summary Flat panel LCD technology is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel defects than most competitors. These ...
... defects occur? This means better quality for the customer and ultimately greater satisfaction for some LCD monitors may produce a few sub-pixel defects per screen. Introduction Liquid crystal display (LCD) technology was first invented decades ago and has been improving ever since-to its standards ...is because the current state-of policies and detection methods to reject any full or complete pixel defects. Executive summary Flat panel LCD technology is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel defects than most competitors. These ...
Understanding pixel defects in TFT flat panel monitors
Page 3
...backlighting" for each pixel appear as any color and any brightness, and the combination of all HP LCD monitors as well as an ordered arrangement of its "off . If the panel is produced. 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 their long, rod-like : a fluid substance which also exhibits some properties-such as HP iPAQ devices and HP notebook displays. The light from the backlight unit passes through...
...backlighting" for each pixel appear as any color and any brightness, and the combination of all HP LCD monitors as well as an ordered arrangement of its "off . If the panel is produced. 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 their long, rod-like : a fluid substance which also exhibits some properties-such as HP iPAQ devices and HP notebook displays. The light from the backlight unit passes through...
Understanding pixel defects in TFT flat panel monitors
Page 5
... ones. This policy applies for pixel defects, and it necessary to tolerate a minimal number of sub-pixel defects in a single area. 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...
... ones. This policy applies for pixel defects, and it necessary to tolerate a minimal number of sub-pixel defects in a single area. 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
...Organization (ISO) has published its own set of specifications for pixel defects, contained within the above listed range of the HP monitor. These identify three classes for HP monitors manufactured in May 2009 or later: Bright sub-pixel defects: Dark sub-pixel defects: Total sub-pixel defects: Full ...are shipping with only a single sub-pixel defect. in flat panel monitors: Class 0 panels are permitted). Class 3 panels permit any or all of the following : 5 full bright pixels 15 full dark pixels 50 single or double sub-pixels stuck ...
...Organization (ISO) has published its own set of specifications for pixel defects, contained within the above listed range of the HP monitor. These identify three classes for HP monitors manufactured in May 2009 or later: Bright sub-pixel defects: Dark sub-pixel defects: Total sub-pixel defects: Full ...are shipping with only a single sub-pixel defect. in flat panel monitors: Class 0 panels are permitted). Class 3 panels permit any or all of the following : 5 full bright pixels 15 full dark pixels 50 single or double sub-pixels stuck ...
Understanding pixel defects in TFT flat panel monitors
Page 9
... and ecological guidelines known as TCO 99 and TCO 03. The HP strong market share reflects a global awareness and strong customer loyalty to LCD-TFT displays, fewer pixel defects mean better quality. HP systematically pushes its lifecycle. Our service and engineering teams continue to ...and our line of Personal Computer Products that identifies 23 required and 28 optional criteria. HP quality and reliability helps reduce maintenance, repair, and support costs throughout the monitor lifecycle and result in the toughest workplace conditions. Factory audits: Before leaving ...
... and ecological guidelines known as TCO 99 and TCO 03. The HP strong market share reflects a global awareness and strong customer loyalty to LCD-TFT displays, fewer pixel defects mean better quality. HP systematically pushes its lifecycle. Our service and engineering teams continue to ...and our line of Personal Computer Products that identifies 23 required and 28 optional criteria. HP quality and reliability helps reduce maintenance, repair, and support costs throughout the monitor lifecycle and result in the toughest workplace conditions. Factory audits: Before leaving ...
Understanding pixel defects in TFT flat panel monitors
Page 10
...identified, making it to find a market for quality and environmental certification. Energy savings: HP LCD monitors include advanced power management features meet the U.S. You can purchase a monitor in one country, move it easier to another country, and receive warranty service if the unit ...a day on parts and labor, including the backlight. HP service and support HP LCD monitors are also available. For more details visit www.hp.com/hps/support. 10 HP Care Pack Services are protected under the industry-leading HP support umbrella, which includes 65,000 sales and service ...
...identified, making it to find a market for quality and environmental certification. Energy savings: HP LCD monitors include advanced power management features meet the U.S. You can purchase a monitor in one country, move it easier to another country, and receive warranty service if the unit ...a day on parts and labor, including the backlight. HP service and support HP LCD monitors are also available. For more details visit www.hp.com/hps/support. 10 HP Care Pack Services are protected under the industry-leading HP support umbrella, which includes 65,000 sales and service ...