Device.Display Requirements

Description: Not Specified

Related Requirements

• Device.Display.Monitor.Base
  
  
• Device.Display.Monitor.ColorimetricTolerance
  
  
• Device.Display.Monitor.DigitalLinkProtection
  
  
• Device.Display.Monitor.EDID
  
  
• Device.Display.Monitor.Modes
  
  
• Device.Display.Monitor.Stereoscopic3DModes
  
  

Target Feature: Device.Display.Monitor

Title: Base requirements for displays to ensure good end user experience

Applicable OS Versions

• Windows 8 (x64)
  
  
• Windows 8 (x86)
  
  
• Windows RT
  
  
• Windows 7 (x86)
  
  
• Windows 7 (x64)
  
  
• Windows Server 2012
  
  
• Windows Server 2008 R2 (x64)
  
  

Description

All connectors on the monitor must be set to a mode which will not apply CE style overscan or underscan by default. It is ok for the monitor to provide an option to allow the user to configure overscan/underscan using an on-screen display.

All video displays that provide a HDMI connector, must support the ITC flag as defined in the HDMI specification.

All digital displays are required to have a single HPD signal transition from low to high on device connection and power up. Periodic toggling of HPD signal after connection or power up is not allowed.

Multiple transition lead source to notify the OS of multiple device arrival and removal event; causing undesirable mode set flashing.

Target Feature: Device.Display.Monitor

Title: Computer display devices can accurately render colors after being calibrated, to within certain colorimetric error tolerances.

Applicable OS Versions

• Windows 7 (x86)
  
  
• Windows 7 (x64)
  
  
• Windows 8 (x86)
  
  
• Windows 8 (x64)
  
  
• Windows RT
  
  
• Windows Server 2012
  
  
• Windows Server 2008 R2 (x64)
  
  

Description

All computer displays must meet the following colorimetric measurement requirements:

1. Maximum luminance level greater than or equal to 75cd/m2
   
   
2. Average 1994 Delta E less than or equal to 20 for the set of 32 colors specified by IEC 61966-4 (Section 11 for Inter-Channel Dependency)
   
   

In addition to the requirements for all displays, standalone or desktop displays must meet the following measurement requirements:

1. Average 1994 Delta E less than or equal to 10 for the desktop set of common colors specified by the Windows Color Quality Test Kit
   
   
2. Maximum 1994 Delta E less than or equal to 15 for the desktop set of common colors specified by the Windows Color Quality Test Kit
   
   

In addition to the requirements for all displays, integrated or notebook displays must meet the following measurement requirements:

1. Average 1994 Delta E less than or equal to 10 for the notebook set of common colors specified by the Windows Color Quality Test Kit.
   
   
2. Maximum 1994 Delta E less than or equal to 15 for the notebook set of common colors specified by the Windows Color Quality Test Kit
   
   

Design Notes

1. Before performing measurements, the display can be calibrated or characterized (or both)using an ICC device color profile, or the default sRGB color profile may be used. This means that the device's default state (the "out of the box" settings for contrast, brightness, color temperature, and so on) may not meet the Windows color fidelity requirements.
   
   
2. Notebook LCDs are expected to meet these values when the system is running on AC power, not DC (battery) power.
   
   

Reference Specifications

• IEC 61966-4 Multimedia Systems and Equipment - Colour Measurement and Management - Part 4: Equipment using liquid crystal display panels. http://webstore.iec.ch/webstore/webstore.nsf/artnum/025978
  
  
• Windows Color Quality Test Kit: http://msdn.microsoft.com/library/windows/hardware/gg463066.aspx
  
  

Target Feature: Device.Display.Monitor

Title: Display monitors that support digital inputs must support digital link protection on all digital inputs

Applicable OS Versions

• Windows 8 (x86)
  
  
• Windows 8 (x64)
  
  
• Windows RT
  
  
• Windows Server 2012
  
  
• Windows Server 2008 R2 (x64)
  
  
• Windows 7 (x64)
  
  
• Windows 7 (x86)
  
  

Description

Displays with digital inputs, such as Digital Visual Interface (DVI), High-Definition Multimedia Interface, (HDMI), or DisplayPort, must support a digital monitor link protection mechanism such as High-bandwidth Digital Content Protection (HDCP).

Target Feature: Device.Display.Monitor

Title: Display device implements the EDID data structure

Applicable OS Versions

• Windows 7 (x86)
  
  
• Windows 7 (x64)
  
  
• Windows Server 2008 R2 (x64)
  
  
• Windows 8 (x86)
  
  
• Windows 8 (x64)
  
  
• Windows Server 2012
  
  
• Windows RT
  
  

Description

The monitor must transmit an EDID structure that contains all required fields, as defined in VESA Enhanced Extended Display Identification Data Standard (E-EDID), Release A, Section 3. This EDID must also contain a unique Manufacturer Name, Product code ID and Serial Number. (Serial number is not required for an integrated panel on a mobile or all in one system.)

For analog CRTs, EDID content must indicate at least one VESA mode at 75 Hz or higher for each supported resolution.

All monitors must support E-EDID by implementing an EDID 1.3 or later data structure that:

• Includes timing data for the preferred display mode in Timing #1.
  
  
  • For an LCD or other fixed-format display, this display mode is the native, progressively scanned mode of the panel.
    
    
  • For other display types, this is the optimal, progressively scanned display mode, which is based on the size and capabilities of the device and must meet the requirements for refresh rates defined above.
    
    
• Implements the screen size or aspect ratio fields, bytes 0x15 and 0x16 per the supported EDID version with accurate dimensions.
  
  
• Sets byte 0x18, Bit 1 to indicate that the preferred mode meaning per the supported EDID version.
  
  
• Includes a unique serial number in at least one of the ID Serial Number field or a Display Product Serial Number string in one of the base block 18 byte descriptors.
  
  
• Implements a Display Product Name string in one of the base block 18 byte descriptors, optional for an integrated panel. This string must be suitable for user interface usage.
  
  
• Implements a Display Range Limits in one of the base block 18 byte descriptors, unless the device is a Non-Continuous Frequency (multi-mode) display.
  
  

Mobile and other all-in-one systems must transmit an EDID structure in one of three ways:

• LCD panel provides one, which is similar to an externally attached monitor.
  
  
• If the LCD panel does not provide one, then the WDDM miniport is responsible for defining and providing it to the operating system.
  
  
• The WDDM driver may run the ACPI _DDC method on the child device associated with the internal panel to retrieve an EDID from the system BIOS.
  
  

Display devices which implement features such as more than 8 bits per primary color must use EDID 1.4 in order to ensure these capabilities can be expressed to the OS and applications.

Design Notes

The ACPI specification defines the method to acquire the EDID from the BIOS to achieve equivalent functionality as specified in ACPI 2.0b, Appendix B, or later.

Target Feature: Device.Display.Monitor

Title: Requirement for resolution support for Display Devices

Applicable OS Versions

• Windows 8 (x86)
  
  
• Windows 8 (x64)
  
  
• Windows RT
  
  
• Windows Server 2012
  
  
• Windows 7 (x86)
  
  
• Windows 7 (x64)
  
  
• Windows Server 2008 R2 (x64)
  
  

Description

A display device can have multiple connectors. The following are the required modes that a display must support on each connector and indicate the support via the EDID (a display is free to support additional modes and call them out in the EDID as well)

For an integrated panel:

The native resolution of the panel must be greater than or equal to 1024 x 768. The native resolution must be supported at 60 Hz progressive or greater or the closest frequency appropriate for the region.

For HD15, DVI, HDMI and DisplayPort connector:

The native resolution of the panel must be greater than or equal to 1024 x 768. The native resolution must be supported at 60 Hz progressive or greater or the closest frequency appropriate for the region.

The following modes must be supported by the display and included in the Established timings in the EDID

• 640 x 480 at 60 Hz progressive (Byte 23h, bit 5 in the Established timing)
  
  
• 800 x 600 at 60 Hz progressive (Byte 23h, bit 0 in the Established timing)
  
  
• 1024 x 768 at 60 Hz progressive (Byte 24h, bit 3 in the Established timing)
  
  

These modes can be supported as full screen or centered

For all other connectors like S-Video, Component, and Composite:

The connector must support the maximum allowable mode as defined in the specification of the standard.

Exceptions: Not Specified

Business Justification:

• Windows UI looks the best on a display that is running at its native resolution. The reason for this is that the pixels are displayed on the screen with no scaling. Also advanced technologies like ClearType are able to operate at a sub pixel level to optimize the clarity of the text. Therefore it is critical for a display to support its native mode.
  
  
• On Windows 8, on an integrated panel, Windows will always use the native mode for all scenarios. Therefore it is not necessary for the integrated panel to support other modes.
  
  
• On Windows 8, running on a WDDM 1.0 or WDDM 1.1 driver, Windows uses the 640 x 480 mode for displaying the bug check screen.
  
  
• On Windows 8, the default mode used by the Basic Display driver on an external monitor is 1024 x 768. This is because many legacy BIOS can most reliably set this mode.
  
  
• Windows UI is optimized to run on modes that are 1024 x 768 and greater. Therefore it is critical that each display device supports this mode because it would give the user the opportunity to select it at a later time
  
  

Scenarios:

• Integrated Display:
  
  
  • User powers up a Windows 8 machine.
    
    
  • The firmware (BIOS/UEFI) sets the native mode according to the System.Fundamentals.Firmware.UEFI.Display requirement before Windows is running 
    
    
  • Windows starts and continues running at the native mode of the panel
    
    
• External Display:
  
  
  • User powers up a Windows 8 machine with an external monitor connected
    
    
  • Windows will use the WDDM 1.2 driver to set the display to its native mode
    
    
• Running the Microsoft Basic Display Driver
  
  
  • User is running a Windows 8 machine that is running the Microsoft Basic Display driver
    
    
  • By default, Windows will set a 1024 x 768 mode
    
    
  • However, the user may select a higher mode by using the Display Control Panel
    
    

Target Feature: Device.Display.Monitor

Title: A Stereo 3D External Display or Internal Mobile Panel must support a Stereo mode equivalent to its native or preferred resolution.

Applicable OS Versions

• Windows 8 (x86)
  
  
• Windows 8 (x64)
  
  
• Windows RT
  
  
• Windows Server 2012
  
  

Description

The native or preferred resolution of the Stereo 3D Display must have an equivalent Stereo mode. The native or preferred resolution of the Display is exposed through its EDID.

Example: If the native resolution of the Stereo 3D Display is 1920 x 1200 in Mono, then it must also support the same native resolution in the Stereo mode.