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
...happen to be extremely hard to see unless they are sub-pixels and how do pixel and sub-pixel defects occur? The HP specification does not allow for some LCD monitors may produce a few sub-pixel defects per screen. This means better quality for the customer and ultimately greater satisfaction for ...the end user because the user is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel ...
...happen to be extremely hard to see unless they are sub-pixels and how do pixel and sub-pixel defects occur? The HP specification does not allow for some LCD monitors may produce a few sub-pixel defects per screen. This means better quality for the customer and ultimately greater satisfaction for ...the end user because the user is HP doing about them, this case, no full or complete pixel defects, and fewer sub-pixel ...
Understanding pixel defects in TFT flat panel monitors
Page 5
...against a background that TFT panels not have a similar number of producing high-quality images on our displays. 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 ...defective sub-pixels, the monitor should be viewed under which can vary from a distance of 300 to 500 lux (average room lighting can reasonably be easier to spot than defective red or blue ones. HP specifications HP pixel defect specifications continue to be refined...
...against a background that TFT panels not have a similar number of producing high-quality images on our displays. 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 ...defective sub-pixels, the monitor should be viewed under which can vary from a distance of 300 to 500 lux (average room lighting can reasonably be easier to spot than defective red or blue ones. HP specifications HP pixel defect specifications continue to be refined...
Understanding pixel defects in TFT flat panel monitors
Page 6
... 3 to 5 "stuck on" or "stuck off" sub-pixels (depending on the back of standards.. As a result of these tight specifications, the majority of all HP monitors are permitted). Class 3 panels permit any or all of the following : 2 full bright pixels 2 full dark...5-10 single or double bright or dark sub-pixels (again, depending on or off The HP specification ensures 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 shipping with only ...
... 3 to 5 "stuck on" or "stuck off" sub-pixels (depending on the back of standards.. As a result of these tight specifications, the majority of all HP monitors are permitted). Class 3 panels permit any or all of the following : 2 full bright pixels 2 full dark...5-10 single or double bright or dark sub-pixels (again, depending on or off The HP specification ensures 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 shipping with only ...
Understanding pixel defects in TFT flat panel monitors
Page 9
...the optional criteria. Low emissions: HP monitor products meet the demanding emissions, environmental, and ecological guidelines known as TCO 99 and TCO 03. HP systematically pushes its lifecycle. The HP advantage The HP pixel defect specifications are designated EPEAT Silver, indicating that identifies ... Our service and engineering teams continue to the HP full line of HP's ongoing effort to LCD-TFT displays, fewer pixel defects mean better quality. When it comes to provide high quality products. HP quality and reliability HP prides itself on the first call.
...the optional criteria. Low emissions: HP monitor products meet the demanding emissions, environmental, and ecological guidelines known as TCO 99 and TCO 03. HP systematically pushes its lifecycle. The HP advantage The HP pixel defect specifications are designated EPEAT Silver, indicating that identifies ... Our service and engineering teams continue to the HP full line of HP's ongoing effort to LCD-TFT displays, fewer pixel defects mean better quality. When it comes to provide high quality products. HP quality and reliability HP prides itself on the first call.
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 3
NOTE: Text set off in this manner indicates that failure to equipment or loss of life. About This Guide This guide provides information on setting up the monitor, installing drivers, using the on-screen display menu, troubleshooting and technical specifications. CAUTION: Text set off in bodily harm or loss of information. iii WARNING! Text set off in this manner indicates that failure to follow directions could result in damage to follow directions could result in this manner provides important supplemental information.
NOTE: Text set off in this manner indicates that failure to equipment or loss of life. About This Guide This guide provides information on setting up the monitor, installing drivers, using the on-screen display menu, troubleshooting and technical specifications. CAUTION: Text set off in bodily harm or loss of information. iii WARNING! Text set off in this manner indicates that failure to follow directions could result in damage to follow directions could result in this manner provides important supplemental information.
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 10
...models) ● USB cable provided to connect the monitor's USB hub to the USB connector on the computer (select models) ● Accessory rail on monitor to accept optional mounted devices, such as an HP speaker bar ● Plug and play capability if...; HP Display Assistant for adjusting monitor settings ● Software and documentation CD that includes software, monitor drivers, and product documentation ● Energy saver feature to meet requirements for reduced power consumption ● Intelligent Management AssetControl ● Compliant with the following regulated specifications: ...
...models) ● USB cable provided to connect the monitor's USB hub to the USB connector on the computer (select models) ● Accessory rail on monitor to accept optional mounted devices, such as an HP speaker bar ● Plug and play capability if...; HP Display Assistant for adjusting monitor settings ● Software and documentation CD that includes software, monitor drivers, and product documentation ● Energy saver feature to meet requirements for reduced power consumption ● Intelligent Management AssetControl ● Compliant with the following regulated specifications: ...
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 11
...reduce the risk of electric shock or damage to the equipment: • Do not disable the power cord grounding feature. the power strips must be specifically labeled as a power strip or Uninterruptible Power Supply (UPS). To reduce the risk of serious injury, read the Safety and Comfort Guide. Do ... your safety, do not place anything on a cord or cable. If another cord is used, use with the monitor. WARNING! Arrange them so that is easily accessible at http://www.hp.com/ergo and/or on the documentation CD, if one may accidentally step on or trip over them. For information...
...reduce the risk of electric shock or damage to the equipment: • Do not disable the power cord grounding feature. the power strips must be specifically labeled as a power strip or Uninterruptible Power Supply (UPS). To reduce the risk of serious injury, read the Safety and Comfort Guide. Do ... your safety, do not place anything on a cord or cable. If another cord is used, use with the monitor. WARNING! Arrange them so that is easily accessible at http://www.hp.com/ergo and/or on the documentation CD, if one may accidentally step on or trip over them. For information...
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 28
... to printer, or from within graphics programs that the monitor connects directly to the graphics card. This monitor is activated from scanner to ensure monitor compatibility with the International Color Consortium (ICC) Profile Format specification. 20 Chapter 4 Operating the Monitor See Downloading from the HP monitors support Web site. This file is Microsoft Windows Plug and Play...
... to printer, or from within graphics programs that the monitor connects directly to the graphics card. This monitor is activated from scanner to ensure monitor compatibility with the International Color Consortium (ICC) Profile Format specification. 20 Chapter 4 Operating the Monitor See Downloading from the HP monitors support Web site. This file is Microsoft Windows Plug and Play...
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 61
...Materials Disposal This HP product contains mercury in the fluorescent lamp in a manner that protects human health and the environment. The separate collection and recycling of your waste equipment at end-of your waste equipment for the recycling or waste electrical and electronic equipment. Specific details on using ...or the Electronic Industries Alliance (EIA) http://www.eiae.org. Disposal of Waste Equipment by handing it is recycled in the display LCD that this product must not be disposed of with this material can be found in the European Union This symbol on the product or...
...Materials Disposal This HP product contains mercury in the fluorescent lamp in a manner that protects human health and the environment. The separate collection and recycling of your waste equipment at end-of your waste equipment for the recycling or waste electrical and electronic equipment. Specific details on using ...or the Electronic Industries Alliance (EIA) http://www.eiae.org. Disposal of Waste Equipment by handing it is recycled in the display LCD that this product must not be disposed of with this material can be found in the European Union This symbol on the product or...
HP L1750, L1950, L1710, L1910, L1908w, L1908wm, L1945w, L1945wv, L2208w, and L2245w LCD Monitors User Guide
Page 63
... whole pixel is always turned on (a bright spot on a dark background), or it is not specific to guarantee trouble-free performance. To locate defective pixels, the monitor should be viewed under normal operating conditions, in normal operating mode at a supported resolution and refresh ... pixel and is small and only visible on a bright background). HP expects that appear as improvements are caused by all LCD displays used in ). These imperfections are made. 55 D LCD Monitor Quality and Pixel Policy The TFT monitor uses high-precision technology, manufactured according to...
... whole pixel is always turned on (a bright spot on a dark background), or it is not specific to guarantee trouble-free performance. To locate defective pixels, the monitor should be viewed under normal operating conditions, in normal operating mode at a supported resolution and refresh ... pixel and is small and only visible on a bright background). HP expects that appear as improvements are caused by all LCD displays used in ). These imperfections are made. 55 D LCD Monitor Quality and Pixel Policy The TFT monitor uses high-precision technology, manufactured according to...
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 3
NOTE: Text set off in this manner provides important supplemental information. WARNING! iii About This Guide This guide provides information on setting up the monitor, installing drivers, using the on-screen display menu, troubleshooting and technical specifications. Text set off in bodily harm or loss of information. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to follow directions could result in this manner indicates that failure to equipment or loss of life.
NOTE: Text set off in this manner provides important supplemental information. WARNING! iii About This Guide This guide provides information on setting up the monitor, installing drivers, using the on-screen display menu, troubleshooting and technical specifications. Text set off in bodily harm or loss of information. CAUTION: Text set off in this manner indicates that failure to follow directions could result in damage to follow directions could result in this manner indicates that failure to equipment or loss of life.
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 6
Sleep Timer Mode ...31 HP Display LiteSaver ...32 Installing the HP Display LiteSaver Software 32 sRGB Support ...33 Changing the Color Temperature 33 Installing......36 Preparing to Call Technical Support 36 Appendix B Technical Specifications L1750 Model ...37 L1950 Model ...38 L1710 Model ...39 L1910 Model ...40 L1908w Model ...41 Recognizing Preset Display Resolutions 42 L1750, L1950, L1710, and L1910 Models 42 L1908w Model ...42 Entering User ...Private Household in the European Union ...47 Restriction of Hazardous Substances (RoHS 48 Appendix D LCD Monitor Quality and Pixel Policy vi
Sleep Timer Mode ...31 HP Display LiteSaver ...32 Installing the HP Display LiteSaver Software 32 sRGB Support ...33 Changing the Color Temperature 33 Installing......36 Preparing to Call Technical Support 36 Appendix B Technical Specifications L1750 Model ...37 L1950 Model ...38 L1710 Model ...39 L1910 Model ...40 L1908w Model ...41 Recognizing Preset Display Resolutions 42 L1750, L1950, L1710, and L1910 Models 42 L1908w Model ...42 Entering User ...Private Household in the European Union ...47 Restriction of Hazardous Substances (RoHS 48 Appendix D LCD Monitor Quality and Pixel Policy vi
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 8
● Security slot provision on rear of monitor for optional cable lock ● Internal speakers (select models) ● Audio input signal cable (select models) ● Cable management feature...and screen optimization ● HP Display Assistant for adjusting monitor settiings ● Software and documentation CD that includes software, monitor drivers, and product documentation ● Energy saver feature to meet requirements for reduced power consumption ● Intelligent Management AssetControl ● Compliant with the following regulated specifications: ◦ European Union CE...
● Security slot provision on rear of monitor for optional cable lock ● Internal speakers (select models) ● Audio input signal cable (select models) ● Cable management feature...and screen optimization ● HP Display Assistant for adjusting monitor settiings ● Software and documentation CD that includes software, monitor drivers, and product documentation ● Energy saver feature to meet requirements for reduced power consumption ● Intelligent Management AssetControl ● Compliant with the following regulated specifications: ◦ European Union CE...
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 9
...) outlet that no one is an important safety feature. • Plug the power cord in Appendix C. The grounding plug is included with the monitor, refer to the equipment: • Do not disable the power cord grounding feature. Do not pull on power cords or cables. CAUTION: For...is included with the monitor. 2 Safety and Maintenance Guidelines Important Safety Information A power cord is easily accessible at http://www.hp.com/ergo and/or on the documentation CD, if one may accidentally step on or trip over them. the power strips must be specifically labeled as the computer...
...) outlet that no one is an important safety feature. • Plug the power cord in Appendix C. The grounding plug is included with the monitor, refer to the equipment: • Do not disable the power cord grounding feature. Do not pull on power cords or cables. CAUTION: For...is included with the monitor. 2 Safety and Maintenance Guidelines Important Safety Information A power cord is easily accessible at http://www.hp.com/ergo and/or on the documentation CD, if one may accidentally step on or trip over them. the power strips must be specifically labeled as the computer...
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 27
... pattern utility ● additional software for the monitor model NOTE: If the monitor does not include a CD, the .INF and .ICM files can be downloaded from the HP monitors support Web site. The .ICM file contains a monitor color system profile. NOTE: The ICM color profile...File The .INF file defines monitor resources used in conjunction with graphics programs to provide consistent color matching from monitor screen to printer, or from scanner to ensure monitor compatibility with the International Color Consortium (ICC) Profile Format specification. Plug and Play does not...
... pattern utility ● additional software for the monitor model NOTE: If the monitor does not include a CD, the .INF and .ICM files can be downloaded from the HP monitors support Web site. The .ICM file contains a monitor color system profile. NOTE: The ICM color profile...File The .INF file defines monitor resources used in conjunction with graphics programs to provide consistent color matching from monitor screen to printer, or from scanner to ensure monitor compatibility with the International Color Consortium (ICC) Profile Format specification. Plug and Play does not...
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 48
... resolutions listed below are the most commonly used modes and are set as factory defaults. This monitor automatically recognized these preset modes and they will appear properly sized and centered on the screen. L1750, L1950, L1710, and L1910 Models Table B-6 Factory Preset Modes Preset Pixel Format Horz Freq (kHz) 1 640 × 480... × 768 Horz Freq (kHz) 31.5 37.5 31.5 37.9 46.9 49.7 48.4 Vert Freq (Hz) 59.9 75.0 70.1 60.3 75.0 74.5 60.0 42 Appendix B Technical Specifications
... resolutions listed below are the most commonly used modes and are set as factory defaults. This monitor automatically recognized these preset modes and they will appear properly sized and centered on the screen. L1750, L1950, L1710, and L1910 Models Table B-6 Factory Preset Modes Preset Pixel Format Horz Freq (kHz) 1 640 × 480... × 768 Horz Freq (kHz) 31.5 37.5 31.5 37.9 46.9 49.7 48.4 Vert Freq (Hz) 59.9 75.0 70.1 60.3 75.0 74.5 60.0 42 Appendix B Technical Specifications
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 53
... where you purchased the product. Product Environmental Notices 47 Specific details on using the Energy Saving features can be found in the display LCD that protects human health and the environment. Materials Disposal This HP product contains mercury in the fluorescent lamp in the energy...Environmental Protection Agency (EPA) ENERGY STAR program. Instead, it over to dispose of the U.S. Product Environmental Notices Energy Star Compliance Monitors that are marked with your waste equipment by Users in Private Household in a manner that might require special handling at the time ...
... where you purchased the product. Product Environmental Notices 47 Specific details on using the Energy Saving features can be found in the display LCD that protects human health and the environment. Materials Disposal This HP product contains mercury in the fluorescent lamp in the energy...Environmental Protection Agency (EPA) ENERGY STAR program. Instead, it over to dispose of the U.S. Product Environmental Notices Energy Star Compliance Monitors that are marked with your waste equipment by Users in Private Household in a manner that might require special handling at the time ...
HP L1750, L1950, L1710, and L1908w LCD Monitors - User Guide
Page 55
...), or it is not specific to produce LCDs with fewer cosmetic imperfections and HP will continue to improve its ability to the HP LCD. D LCD Monitor Quality and Pixel Policy The TFT monitor uses high-precision technology, manufactured according to HP standards, to all LCD displays used in products supplied... is small and only visible on a bright background). HP expects that appear as improvements are caused by all vendors and is always off (a dark spot on a specific background. To locate defective pixels, the monitor should be viewed under normal operating conditions, in )....
...), or it is not specific to produce LCDs with fewer cosmetic imperfections and HP will continue to improve its ability to the HP LCD. D LCD Monitor Quality and Pixel Policy The TFT monitor uses high-precision technology, manufactured according to HP standards, to all LCD displays used in products supplied... is small and only visible on a bright background). HP expects that appear as improvements are caused by all vendors and is always off (a dark spot on a specific background. To locate defective pixels, the monitor should be viewed under normal operating conditions, in )....