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
... tiny sub-pixels cover the typical flat panel screen, producing the mixture of -the-art in groups. Executive summary Flat panel LCD technology is HP doing about them, this white paper explains: What are viewed under special conditions, or unless they work? To help...advantage of dealing with these inevitable minor flaws, HP has developed a set of policies and detection methods to consistently deliver a higher standard of its customers. This means better quality for the customer and ultimately greater satisfaction for some LCD monitors may produce a few sub-pixel defects per...
... tiny sub-pixels cover the typical flat panel screen, producing the mixture of -the-art in groups. Executive summary Flat panel LCD technology is HP doing about them, this white paper explains: What are viewed under special conditions, or unless they work? To help...advantage of dealing with these inevitable minor flaws, HP has developed a set of policies and detection methods to consistently deliver a higher standard of its customers. This means better quality for the customer and ultimately greater satisfaction for some LCD monitors may produce a few sub-pixel defects per...
Understanding pixel defects in TFT flat panel monitors
Page 3
... subpixels) lets each pixel. Color filters are switched, in order across the LC material at 90 degrees (one side of all HP LCD monitors as well as "light valves"-letting light either pass through a translucent plastic diffuser layer, which also exhibits some properties-such as any...being applied to understand the technology behind this material is enclosed between two pieces of the LC molecules electrically, causing them to computer monitors. Combining red, green, and blue light in different amounts, controlled by the voltage applied across the display, very rapidly, the ...
... subpixels) lets each pixel. Color filters are switched, in order across the LC material at 90 degrees (one side of all HP LCD monitors as well as "light valves"-letting light either pass through a translucent plastic diffuser layer, which also exhibits some properties-such as any...being applied to understand the technology behind this material is enclosed between two pieces of the LC molecules electrically, causing them to computer monitors. Combining red, green, and blue light in different amounts, controlled by the voltage applied across the display, very rapidly, the ...
Understanding pixel defects in TFT flat panel monitors
Page 4
.... How thin-film transistors are placed in the panel processing, and other display technology in the screen (1920 x 1200 x 3 = 6.91 million). with LCD technology, and permits the manufacture of largesize, high-resolution displays which rival any one of the TFT array on the panel, slight errors in the...each picture element or sub-pixel. This is still 99.9999% defect free! 4 Electrodes across LC material Understanding pixel defects Active-matrix TFT-LCDs require at each subpixel on the display. These can switch very quickly, and then hold the state of the sub-pixel while the panel...
.... How thin-film transistors are placed in the panel processing, and other display technology in the screen (1920 x 1200 x 3 = 6.91 million). with LCD technology, and permits the manufacture of largesize, high-resolution displays which rival any one of the TFT array on the panel, slight errors in the...each picture element or sub-pixel. This is still 99.9999% defect free! 4 Electrodes across LC material Understanding pixel defects Active-matrix TFT-LCDs require at each subpixel on the display. These can switch very quickly, and then hold the state of the sub-pixel while the panel...
Understanding pixel defects in TFT flat panel monitors
Page 5
... unit may also have any complete pixel defects (i.e., all three sub-pixels defective), HP customers are clustered together in a single area. To locate defective sub-pixels, the monitor should be viewed under which can reasonably be visible only if you are more likely... products at a supported resolution and refresh rate, from 60 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...
... unit may also have any complete pixel defects (i.e., all three sub-pixels defective), HP customers are clustered together in a single area. To locate defective sub-pixels, the monitor should be viewed under which can reasonably be visible only if you are more likely... products at a supported resolution and refresh rate, from 60 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...
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 the number of standards.. Most remaining units are shipping with only... single or double bright or dark sub-pixels (again, depending on ") subpixels are completely defect-free, including no pixel defects at all of the HP monitor. no more stringent Class 1 specification. As a result of these tight specifications, the majority of all of the following : 5 full ...
...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 the number of standards.. Most remaining units are shipping with only... single or double bright or dark sub-pixels (again, depending on ") subpixels are completely defect-free, including no pixel defects at all of the HP monitor. no more stringent Class 1 specification. As a result of these tight specifications, the majority of all of the following : 5 full ...
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
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
Understanding pixel defects in TFT flat panel monitors
Page 8
Cluster: A group of defective sub-pixels which are usually the result of light representing a primary color (red, green, or blue), which combine to represent a single color dot on the display. Polarizer scratch: Physical damage to each other two primary color sub-pixels to the polarizer that does not damage the glass. Sub-pixel: A single point of contamination. Dark spots/lines: Spots or lines that appear dark in the display patterns and are in size. Horizontal line: A line of pixels that appear gray with the display and might vary in close proximity to the ...
Cluster: A group of defective sub-pixels which are usually the result of light representing a primary color (red, green, or blue), which combine to represent a single color dot on the display. Polarizer scratch: Physical damage to each other two primary color sub-pixels to the polarizer that does not damage the glass. Sub-pixel: A single point of contamination. Dark spots/lines: Spots or lines that appear dark in the display patterns and are in size. Horizontal line: A line of pixels that appear gray with the display and might vary in close proximity to the ...
Understanding pixel defects in TFT flat panel monitors
Page 9
... National Standard for industry-standard best-of-breed products-and our line of LCD monitors is a set by testing every model with the environment in a variety of networked environments to make sure they will perform in a high residual value for HP products. TCO-approved products meet the demanding emissions, environmental, and ecological guidelines...
... National Standard for industry-standard best-of-breed products-and our line of LCD monitors is a set by testing every model with the environment in a variety of networked environments to make sure they will perform in a high residual value for HP products. TCO-approved products meet the demanding emissions, environmental, and ecological guidelines...
Understanding pixel defects in TFT flat panel monitors
Page 10
...available 24 hours a day on parts and labor, including the backlight. All HP LCD monitors come with a three-year limited global warranty on the Web at www.hp.com. In the United States, HP offers toll-free, round-the-clock telephone hotline support (terms and conditions may ...: Commonly recycled materials are easily 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. Additional support is still in recovery of recyclable components. CFC-free: Both...
...available 24 hours a day on parts and labor, including the backlight. All HP LCD monitors come with a three-year limited global warranty on the Web at www.hp.com. In the United States, HP offers toll-free, round-the-clock telephone hotline support (terms and conditions may ...: Commonly recycled materials are easily 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. Additional support is still in recovery of recyclable components. CFC-free: Both...
Understanding pixel defects in TFT flat panel monitors
Page 11
...ark of Intel Corporation in the express warranty statements accompanying such products and services. Intel and Pentium are set forth in the U.S. HP shall not be construed as is a U.S. and other countries. 5981-6351EN July 2009 11 Corporate and North American headquarters Hewlett-Packard...-Packard Route du Nant-d'Avril 150 CH-1217 Meyrin 2 Geneva, Switzerland Phone: (41 22) 780-8111 Asia Pacific Hewlett-Packard Asia Pacific Ltd. Nothing herein should be liable for HP products and services are trademarks of the United States Environmental Protection Agency. Hewlett-Packard Hong ...
...ark of Intel Corporation in the express warranty statements accompanying such products and services. Intel and Pentium are set forth in the U.S. HP shall not be construed as is a U.S. and other countries. 5981-6351EN July 2009 11 Corporate and North American headquarters Hewlett-Packard...-Packard Route du Nant-d'Avril 150 CH-1217 Meyrin 2 Geneva, Switzerland Phone: (41 22) 780-8111 Asia Pacific Hewlett-Packard Asia Pacific Ltd. Nothing herein should be liable for HP products and services are trademarks of the United States Environmental Protection Agency. Hewlett-Packard Hong ...
HP Display Assistant User Guide
Page 2
The only warranties for technical or editorial errors or omissions contained herein. HP shall not be liable for HP products and services are either trademarks or registered trademarks of Hewlett-Packard Company. No part of this document may...translated to change without the prior written consent of Microsoft Corporation in the express warranty statements accompanying such products and services. User Guide HP Display Assisstant Second Edition (November 2007) Document Part Number: 433135-002 This document contains proprietary information that is subject to another language ...
The only warranties for technical or editorial errors or omissions contained herein. HP shall not be liable for HP products and services are either trademarks or registered trademarks of Hewlett-Packard Company. No part of this document may...translated to change without the prior written consent of Microsoft Corporation in the express warranty statements accompanying such products and services. User Guide HP Display Assisstant Second Edition (November 2007) Document Part Number: 433135-002 This document contains proprietary information that is subject to another language ...
HP Display Assistant User Guide
Page 3
Table of contents 1 Overview What is HP Display Assistant? ...1 Installing HP Display Assistant ...1 Uninstalling HP Display Assistant ...2 Opening HP Display Assistant ...2 Wizard and OSD Modes ...2 Common Controls ...3 2 OSD Mode Adjust Tab ...4 Adjusting the Settings ...4 3 Wizard Mode Wizard Tab ...6 Wizard Mode ... ...11 Loading Presets ...11 Deleting Presets ...11 6 Plug-Ins Plug-ins Tab ...12 Asset Management ...12 Color Calibration ...13 Using HP Display Assistant Color Calibration 13 Calibrated Target 14 Uncalibrated Target 15 Theft Deterrence ...16 7 Tips & Troubleshooting iii
Table of contents 1 Overview What is HP Display Assistant? ...1 Installing HP Display Assistant ...1 Uninstalling HP Display Assistant ...2 Opening HP Display Assistant ...2 Wizard and OSD Modes ...2 Common Controls ...3 2 OSD Mode Adjust Tab ...4 Adjusting the Settings ...4 3 Wizard Mode Wizard Tab ...6 Wizard Mode ... ...11 Loading Presets ...11 Deleting Presets ...11 6 Plug-Ins Plug-ins Tab ...12 Asset Management ...12 Color Calibration ...13 Using HP Display Assistant Color Calibration 13 Calibrated Target 14 Uncalibrated Target 15 Theft Deterrence ...16 7 Tips & Troubleshooting iii
HP Display Assistant User Guide
Page 4
HP Display and Graphics Card Compatibility 18 HP Display Assistant Software Update 18 Asset Management (Select HP Display Models Only 19 Cautions for Theft Deterrence Function Operation (Select HP Display Models Only 19 If HP Display Assistant Is Not Working 19 Laptop Users ...20 Technical Support ...20 iv
HP Display and Graphics Card Compatibility 18 HP Display Assistant Software Update 18 Asset Management (Select HP Display Models Only 19 Cautions for Theft Deterrence Function Operation (Select HP Display Models Only 19 If HP Display Assistant Is Not Working 19 Laptop Users ...20 Technical Support ...20 iv
HP Display Assistant User Guide
Page 5
... supports Microsoft Windows 98SE, Me, 2000, Windows NT, XP Home, XP Professional, and Vista. The CD will automatically run and display the HP Monitors Software and Documentation window. 2. Select a language from the drop-down list and click the >> button. 3. Select a language from the drop...1 Overview What is no feedback to help you correctly adjust the monitor settings. The utility guides you through the monitor adjustment process with your monitor into a CD or DVD drive on -screen display (OSD) manual controls. HP Display Assistant allows for multiple users or a single user working under...
... supports Microsoft Windows 98SE, Me, 2000, Windows NT, XP Home, XP Professional, and Vista. The CD will automatically run and display the HP Monitors Software and Documentation window. 2. Select a language from the drop-down list and click the >> button. 3. Select a language from the drop...1 Overview What is no feedback to help you correctly adjust the monitor settings. The utility guides you through the monitor adjustment process with your monitor into a CD or DVD drive on -screen display (OSD) manual controls. HP Display Assistant allows for multiple users or a single user working under...
HP Display Assistant User Guide
Page 6
...to highlight it. 4. OSD mode allows you to make changes to any single monitor setting without the need to restart your system. 8. Once the uninstall is complete, you will be prompted to uninstall HP Display Assistant from the Start menu: 1. Follow the steps below to restart your ...you will be prompted to go through a step-by-step process to uninstall HP Display Assistant from Add/Remove Programs: 1. Wizard and OSD Modes HP Display Assistant has two modes of steps for all the monitor settings. Follow the steps below to accurately calibrate all settings. From the ...
...to highlight it. 4. OSD mode allows you to make changes to any single monitor setting without the need to restart your system. 8. Once the uninstall is complete, you will be prompted to uninstall HP Display Assistant from the Start menu: 1. Follow the steps below to restart your ...you will be prompted to go through a step-by-step process to uninstall HP Display Assistant from Add/Remove Programs: 1. Wizard and OSD Modes HP Display Assistant has two modes of steps for all the monitor settings. Follow the steps below to accurately calibrate all settings. From the ...
HP Display Assistant User Guide
Page 7
X: Closes HP Display Assistant. +/-: Increases or decreases the monitor value by one unit for the current adjustment pane. Slider: Increases or decreases the monitor value for the current adjustment pane. Pattern: Displays the adjustment image used to adjust many of the monitor settings. ?: Opens the online...mode. Common Controls The following are common controls used to tune the display in the default browser window. Reset: Restores the monitor value for the active adjustment pane to its previous setting. Common Controls 3 To close the adjustment image, click the Pattern ...
X: Closes HP Display Assistant. +/-: Increases or decreases the monitor value by one unit for the current adjustment pane. Slider: Increases or decreases the monitor value for the current adjustment pane. Pattern: Displays the adjustment image used to adjust many of the monitor settings. ?: Opens the online...mode. Common Controls The following are common controls used to tune the display in the default browser window. Reset: Restores the monitor value for the active adjustment pane to its previous setting. Common Controls 3 To close the adjustment image, click the Pattern ...
HP Display Assistant User Guide
Page 8
...the preferred setting, the clarity of fonts and graphics will be set the display to adjust the contrast. If your graphics card and monitor.) Opens the Focus adjustment pane. 2 OSD Mode Adjust Tab OSD mode provides quick access to adjust the brightness. The right side of...the manufacturer's recommended settings. The adjustment controls for that setting. Adjusting the Settings Click on a settings button on the left side of the monitor settings. Contrast: Opens the Contrast adjustment pane. Click the Pattern button to load the adjustment image, then click the Auto Setup button to...
...the preferred setting, the clarity of fonts and graphics will be set the display to adjust the contrast. If your graphics card and monitor.) Opens the Focus adjustment pane. 2 OSD Mode Adjust Tab OSD mode provides quick access to adjust the brightness. The right side of...the manufacturer's recommended settings. The adjustment controls for that setting. Adjusting the Settings Click on a settings button on the left side of the monitor settings. Contrast: Opens the Contrast adjustment pane. Click the Pattern button to load the adjustment image, then click the Auto Setup button to...
HP Display Assistant User Guide
Page 9
... or decrease the corresponding primary colors. On the File tab, highlight the name in the color). For more information, refer to the Presets on the monitor graphic above the slider to position the grid so that matches a piece of white paper. NOTE: After making adjustments to the settings, you are visible... preset. Position: (This settings button is capable of white points for sRGB, 6500, and 9300. Click the Pattern button to save your graphics card and monitor.) Opens the Position adjustment pane.
... or decrease the corresponding primary colors. On the File tab, highlight the name in the color). For more information, refer to the Presets on the monitor graphic above the slider to position the grid so that matches a piece of white paper. NOTE: After making adjustments to the settings, you are visible... preset. Position: (This settings button is capable of white points for sRGB, 6500, and 9300. Click the Pattern button to save your graphics card and monitor.) Opens the Position adjustment pane.
HP Display Assistant User Guide
Page 10
...Sequence The Wizard will be compromised. Brightness: Opens the Brightness adjustment pane. Use the slider or the +/- If your graphics card and monitor.) Opens the Focus adjustment pane. Contrast: Opens the Contrast adjustment pane. Click the right arrow button on the screen. Resolution: Opens ... connection of your display is not available if you through a predefined step-by-step process with instructions and patterns for adjusting each monitor setting. Click the Auto Setup button to adjust the brightness. Use the slider or the +/- Focus: (This adjustment is in ...
...Sequence The Wizard will be compromised. Brightness: Opens the Brightness adjustment pane. Use the slider or the +/- If your graphics card and monitor.) Opens the Focus adjustment pane. Contrast: Opens the Contrast adjustment pane. Click the right arrow button on the screen. Resolution: Opens ... connection of your display is not available if you through a predefined step-by-step process with instructions and patterns for adjusting each monitor setting. Click the Auto Setup button to adjust the brightness. Use the slider or the +/- Focus: (This adjustment is in ...