HOME
The Info List - CEA-861


--- Advertisement ---



Extended Display Identification Data (EDID) is a metadata format for display devices to describe their capabilities to a video source (e.g. graphics card or set-top box). The data format is defined by a standard published by the Video Electronics Standards Association (VESA). EDID data structure includes manufacturer name and serial number, product type, phosphor or filter type, timings supported by the display, display size, luminance data and (for digital displays only) pixel mapping data. DisplayID is a VESA standard targeted to replace EDID and E-EDID extensions with a uniform format suited for both PC monitor and consumer electronics devices.

Contents

1 Background

1.1 EDID Extensions assigned by VESA

2 Revision history 3 Limitations 4 EDID 1.4 data format 5 EIA/CEA-861 extension block

5.1 CEA EDID Timing Extension data format - Version 3

6 References 7 External links

Background[edit]

This section relies too much on references to primary sources. Please improve this section by adding secondary or tertiary sources. (February 2013) (Learn how and when to remove this template message)

EDID structure versions range from v1.0 to v1.4; all these define upwards-compatible 128-byte structures. EDID structure v2.0 defined a new 256-byte structure, but subsequently has been deprecated and replaced by v1.3 which support multiple exension blocks.[citation needed] HDMI versions 1.0–1.3c use EDID structure v1.3.[1] Before Display Data Channel (DDC) and EDID were defined, there was no standard way for a graphics card to know what kind of display device it was connected to. Some VGA connectors in personal computers provided a basic form of identification by connecting one, two or three pins to ground, but this coding was not standardized. The channel for transmitting the EDID from the display to the graphics card is usually the I²C-bus, defined in DDC2B (DDC1 used a different serial format which never gained popularity). The EDID is often stored in the monitor in a memory device called a serial PROM (programmable read-only memory) or EEPROM (electrically erasable PROM) and is accessible via the I²C-bus at address 0x50.[2] The EDID PROM can often be read by the host PC even if the display itself is turned off. Many software packages can read and display the EDID information, such as read-edid[3] for Linux and DOS, PowerStrip[4] for Microsoft Windows and XFree86 for Linux and BSD unix. Mac OS X natively reads EDID information and programs such as SwitchResX[5] or DisplayConfigX[6] can display the information as well as use it to define custom resolutions. Enhanced EDID was introduced at the same time as E-DDC; it introduced EDID structure version 1.3 which supports multiple extensions blocks and deprecated EDID version 2.0 structure (although it can be supported as an extension). Data fields for preferred timing, range limits, and monitor name are required in E-EDID. E-EDID also supports dual GTF timings and aspect ratio change.[clarification needed] With the use of extensions, E-EDID string can be lengthened up to 32 KBytes. EDID Extensions assigned by VESA[edit]

Timing Extension (00h) Additional Timing Data Block (CEA EDID Timing Extension) (02h) Video Timing Block Extension (VTB-EXT) (10h) EDID 2.0 Extension (20h) Display Information Extension (DI-EXT) (40h) Localized String Extension (LS-EXT) (50h) Microdisplay Interface Extension (MI-EXT) (60h) Display Transfer Characteristics Data Block (DTCDB) (A7h, AFh, BFh) Block Map (F0h) Display Device Data Block (DDDB) (FFh) Extension defined by monitor manufacturer (FFh): According to LS-EXT, actual contents varies from manufacturer. However, the value is later used by DDDB.

Revision history[edit]

August 1994, DDC standard version 1 – EDID v1.0 structure. April 1996, EDID standard version 2 – EDID v1.1 structure. 1997, EDID standard version 3 – EDID structures v1.2 and v2.0 February 2000, E-EDID Standard Release A, v1.0 – EDID structure v1.3, EDID structure v2.0 deprecated September 2006 – E-EDID Standard Release A, v2.0 – EDID structure v1.4

Limitations[edit] Some graphics card drivers have historically coped poorly with the EDID, using only its standard timing descriptors rather than its Detailed Timing Descriptors (DTDs). Even in cases where the DTDs were read, the drivers are/were still often limited by the standard timing descriptor limitation that the horizontal/vertical resolutions must be evenly divisible by 8. This means that many graphics cards cannot express the native resolutions of the most common wide screen flat panel displays and liquid crystal display televisions. The number of vertical pixels is calculated from the horizontal resolution and the selected aspect ratio. To be fully expressible, the size of wide screen display must thus be a multiple of 16×9 pixels. For 1366×768 pixel Wide XGA panels the nearest resolution expressible in the EDID standard timing descriptor syntax is 1360×765 pixels, typically leading to 3 pixel thin black bars. Specifying 1368 pixels as the screen width would yield an unnatural screen height of 769.5 pixels. Many Wide XGA panels do not advertise their native resolution in the standard timing descriptors, instead offering only a resolution of 1280×768. Some panels advertise a resolution only slightly smaller than the native, such as 1360×765. For these panels to be able to show a pixel perfect image, the EDID data must be ignored by the display driver or the driver must correctly interpret the DTD and be able to resolve resolutions whose size is not divisible by 8. Special programs are available to override the standard timing descriptors from EDID data. Even this is not always possible, as some vendors' graphics drivers (notably those of Intel) require specific registry hacks to implement custom resolutions, which can make it very difficult to use the screen's native resolution.[7] EDID 1.4 data format[edit]

EDID structure, version 1.4[8][9]

Bytes Description

0–19 Header information

0–7 Fixed header pattern: 00 FF FF FF FF FF FF 00

8–9 Manufacturer ID. This is a legacy Plug and Play ID assigned by Microsoft, which is a big-endian 16-bit value made up of three 5-bit letters: 00001=A, 00010=B, ... 11010=Z. E.g. 24 4d = 0 01001 00010 01101 = "IBM".

Bit 15 (Reserved, always 0)

Bits 14–10 First letter of manufacturer ID (byte 8, bits 6–2)

Bits 9–5 Second letter of manufacturer ID (byte 8, bit 1 through byte 9 bit 5)

Bits 4–0 Third letter of manufacturer ID (byte 9 bits 4–0)

10–11 Manufacturer product code. 16-bit number, little-endian.

12–15 Serial number. 32 bits, little endian.

16 Week of manufacture, or model year flag. Week numbering is not consistent between manufacturers.

17 Year of manufacture, less 1990 (1990–2245). If week=255, it is the model year instead.

18 EDID version, usually 1 (for 1.3)

19 EDID revision, usually 3 (for 1.3)

20–24 Basic display parameters.

20 Video input parameters bitmap

Bit 7=1 Digital input. If set, the following bit definitions apply:

Bits 6–4 Bit depth: 000=undefined, 001=6, 010=8, 011=10, 100=12, 101=14, 110=16 bits per color, 111=reserved

Bits 3–0 Video interface: 0000=undefined, 0001=HDMIa, 0010=HDMIb, 0100=MDDI, 0101=DisplayPort

Bit 7=0 Analog input. If clear, the following bit definitions apply:

Bits 6–5 Video white and sync levels, relative to blank: 00=+0.7/−0.3 V; 01=+0.714/−0.286 V; 10=+1.0/−0.4 V; 11=+0.7/0 V

Bit 4 Blank-to-black setup (pedestal) expected

Bit 3 Separate sync supported

Bit 2 Composite sync (on HSync) supported

Bit 1 Sync on green supported

Bit 0 VSync pulse must be serrated when composite or sync-on-green is used.

21 Horizontal screen size, in centimetres (range 1-255). If vsize=0, landscape aspect ratio (range 1.00-3.54), datavalue = (AR×100)-99 (example: 16:9 = 79, 4:3 = 34)

22 Vertical screen size, in centimetres. If hsize=0, portrait aspect ratio (range 0.28-0.99), datavalue = (100/AR)-99 (example: 9:16 = 79, 3:4 = 34). If either byte is 0, screen size and aspect ration are undefined (e.g. projector)

23 Display gamma, factory default (range 1.00–3.54), datavalue = (gamma×100)-100 = (gamma−1)×100. If 225, gamma is defined by DI-EXT block.

24 Supported features bitmap

Bit 7 DPMS standby supported

Bit 6 DPMS suspend supported

Bit 5 DPMS active-off supported

Bits 4–3 Display type (digital): 00 = RGB 4:4:4; 01 = RGB 4:4:4 + YCrCb 4:4:4; 10 = RGB 4:4:4 + YCrCb 4:2:2; 11 = RGB 4:4:4 + YCrCb 4:4:4 + YCrCb 4:2:2

Bits 4–3 Display type (analog): 00 = Monochrome or Grayscale; 01 = RGB color; 10 = Non-RGB color; 11 = Undefined

Bit 2 Standard sRGB colour space. Bytes 25–34 must contain sRGB standard values.

Bit 1 Preferred timing mode specified in descriptor block 1. For EDID 1.3+ the preferred timing mode is always in the first Detailed Timing Descriptor. In that case, this bit specifies whether the preferred timing mode includes native pixel format and refresh rate.

Bit 0 Continuous timings with GTF or CVT

25–34 Chromaticity coordinates. 10-bit CIE 1931 xy coordinates for red, green, blue, and white point

25 Red and green least-significant bits (2−9, 2−10)

Bits 7–6 Red x value least-significant 2 bits

Bits 5–4 Red y value least-significant 2 bits

Bits 3–2 Green x value least-significant 2 bits

Bits 1–0 Green y value least-significant 2 bits

26 Blue and white least-significant 2 bits

27 Red x value most significant 8 bits (2−1,...,2−8). 0–255 encodes fractional 0–0.996 (255/256); 0–0.999 (1023/1024) with lsbits

28 Red y value most significant 8 bits

29–30 Green x and y value most significant 8 bits

31–32 Blue x and y value most significant 8 bits

33–34 Default white point x and y value most significant 8 bits

35–37 Established timing bitmap. Supported bitmap for (formerly) very common timing modes.

35 Bit 7 720×400 @ 70 Hz (VGA)

Bit 6 720×400 @ 88 Hz (XGA)

Bit 5 640×480 @ 60 Hz (VGA)

Bit 4 640×480 @ 67 Hz (Apple Macintosh II)

Bit 3 640×480 @ 72 Hz

Bit 2 640×480 @ 75 Hz

Bit 1 800×600 @ 56 Hz

Bit 0 800×600 @ 60 Hz

36 Bit 7 800×600 @ 72 Hz

Bit 6 800×600 @ 75 Hz

Bit 5 832×624 @ 75 Hz (Apple Macintosh II)

Bit 4 1024×768 @ 87 Hz, interlaced (1024×768i)

Bit 3 1024×768 @ 60 Hz

Bit 2 1024×768 @ 72 Hz

Bit 1 1024×768 @ 75 Hz

Bit 0 1280×1024 @ 75 Hz

37 Bit 7 1152x870 @ 75 Hz (Apple Macintosh II)

Bits 6–0 Other manufacturer-specific display modes

38–53 Standard timing information. Up to 8 2-byte fields describing standard display modes. Unused fields are filled with 01 01

Byte 0 X resolution, divided by 8, less 31 (256–2288 pixels, value 00 is reserved and should not be used)

Byte 1 bits 7–6 Image aspect ratio: 00=16:10; 01=4:3; 10=5:4; 11=16:9. (Versions prior to 1.3 defined 00 as 1:1.)

Byte 1 bits 5–0 Vertical frequency, less 60 (60–123 Hz)

54–71 Descriptor 1 Descriptor blocks. Detailed timing descriptors, in decreasing preference order. After all detailed timing descriptors, additional descriptors are permitted:

Monitor range limits (required) ASCII text (monitor name (required), monitor serial number or unstructured text) 6 Additional standard timing information blocks Colour point data

72–89 Descriptor 2

90–107 Descriptor 3

108–125 Descriptor 4

126 Number of extensions to follow. 0 if no extensions.

127 Checksum. Sum of all 128 bytes should equal 0 (mod 256).

EDID Detailed Timing Descriptor[8]

Bytes Description

0–1 Pixel clock in 10 kHz units. (0.01–655.35 MHz, little-endian)

2 Horizontal active pixels 8 lsbits (0–4095)

3 Horizontal blanking pixels 8 lsbits (0–4095) End of active to start of next active.

4 Bits 7–4 Horizontal active pixels 4 msbits

Bits 3–0 Horizontal blanking pixels 4 msbits

5 Vertical active lines 8 lsbits (0–4095)

6 Vertical blanking lines 8 lsbits (0–4095)

7 Bits 7–4 Vertical active lines 4 msbits

Bits 3–0 Vertical blanking lines 4 msbits

8 Horizontal front porch (sync offset) pixels 8 lsbits (0–1023) From blanking start

9 Horizontal sync pulse width pixels 8 lsbits (0–1023)

10 Bits 7–4 Vertical front porch (sync offset) lines 4 lsbits (0–63)

Bits 3–0 Vertical sync pulse width lines 4 lsbits (0–63)

11 Bits 7–6 Horizontal front porch (sync offset) pixels 2 msbits

Bits 5–4 Horizontal sync pulse width pixels 2 msbits

Bits 3–2 Vertical front porch (sync offset) lines 2 msbits

Bits 1–0 Vertical sync pulse width lines 2 msbits

12 Horizontal image size, mm, 8 lsbits (0–4095 mm, 161 in)

13 Vertical image size, mm, 8 lsbits (0–4095 mm, 161 in)

14 Bits 7–4 Horizontal image size, mm, 4 msbits

Bits 3–0 Vertical image size, mm, 4 msbits

15 Horizontal border pixels (one side; total is twice this)

16 Vertical border lines (one side; total is twice this)

17 Features bitmap

Bit 7 Interlaced

Bits 6–5 Stereo mode: 00=No stereo; other values depend on bit 0: Bit 0=0: 01=Field sequential, sync=1 during right; 10=similar, sync=1 during left; 11=4-way interleaved stereo Bit 0=1: 01=Right image on even lines; 10=Left image on even lines; 11=side-by-side

Bit 4=0 Analog sync. If set, the following bit definitions apply:

Bit 3 Sync type: 0=Analog composite; 1=Bipolar analog composite

Bit 2 VSync serration (HSync during VSync)

Bit 1 Sync on all 3 RGB lines (else green only)

Bits 4-3=10 Digital composite (on HSync). If set, the following bit definitions apply:

Bit 2 Vertical sync polarity (0=negative, 1=positive)

Bit 1 reserved

Bits 4-3=11 Digital separate sync. If set, the following bit definitions apply:

Bit 2 VSync serration (HSync during VSync)

Bit 1 Horizontal Sync polarity (0=negative, 1=positive)

Bit 0 2-way line-interleaved or side-by-side interleaved stereo, if bits 6–5 are not 00.

When used for another descriptor, the pixel clock and some other bytes are set to 0:

EDID Other Monitor Descriptors[8]

Bytes Description

0–1 Zero, indicates not a detailed timing descriptor

2 Zero

3 Descriptor type. FA–FF currently defined. 00–0F reserved for vendors.

4 Zero

5–17 Defined by descriptor type. If text, code page 437 text, terminated (if less than 13 bytes) with LF and padded with SP.

Currently defined descriptor types are:

0xFF: Display serial number (ASCII text) 0xFE: Unspecified text (ASCII text) 0xFD: Display range limits. 6- or 13-byte (with additional timing) binary descriptor. 0xFC: Display name (ASCII text). 0xFB: Additional white point data. 2× 5-byte descriptors, padded with 0A 20 20. 0xFA: Additional standard timing identifiers. 6× 2-byte descriptors, padded with 0A. 0xF9 Display Color Management (DCM). 0xF8 CVT 3-Byte Timing Codes. 0xF7 Additional standard timing 3. 0x10 Dummy identifier. 00-0x0Fh Manufacturer reserved descriptors.

EDID Display Range Limits Descriptor[8]

Bytes Description

0–3 Standard header, byte 3 = 0xFD.

4 Offsets for display range limits

Bits 7–4 Unused, must be 0.

Bits 3–2 Horizontal rate offsets: 00=None, 10=+255 kHz for Max rate, 11=+255 kHz for Max and Min rates

Bits 1–0 Vertical rate offsets: 00=None, 10=+255 Hz for Max rate, 11=+255 Hz for Max and Min rates

5 Minimum vertical field rate (1–255 Hz) (256–512 Hz if offset)

6 Maximum vertical field rate (1–255 Hz) (256–512 Hz if offset)

7 Minimum horizontal line rate (1–255 kHz) (256–512 kHz if offset)

8 Maximum horizontal line rate (1–255 kHz) (256–512 kHz if offset)

9 Maximum pixel clock rate, rounded up to 10 MHz multiple (10–2550 MHz)

10 Extended timing information type: 00: Default GTF (when Basic display parameters byte 24 bit 0 is set. 01: No timing information. 02: Secondary GTF supported, parameters as follows. 04: CVT (when Basic display parameters byte 24 bit 0 is set), parameters as follows.

11-17 Video timing parameters (if byte 10 is 00 or 01, padded with 0A 20 20 20 20 20 20).

EDID Display Range Limits with GTF Secondary curve[8]

Bytes Description

10 02

11 Reserved, must be 0.

12 Start frequency for secondary curve, divided by 2 kHz (0–510 kHz)

13 GTF C value, multiplied by 2 (0–127.5)

14–15 GTF M value (0–65535, little-endian)

16 GTF K value (0–255)

17 GTF J value, multiplied by 2 (0–127.5)

EDID Display Range Limits with CVT support[8]

Bytes Description

10 04

11 Bits 7–4 CVT major version (1-15)

Bits 3–0 CVT minor version (0-15)

12 Bits 7–2 Additional clock precision in 0.25 MHz increments (to be subtracted from byte 9 Maximum pixel clock rate)

Bits 1–0 Maximum active pixels per line, 2-bit msb

13 Maximum active pixels per line, 8-bit lsb (no limit if 0)

14 Aspect ratio bitmap

Bit 7 4:3

Bit 6 16:9

Bit 5 16:10

Bit 4 5:4

Bit 3 15:9

Bits 2–0 Reserved, must be 0.

15 Bits 7–5 Aspect ratio preference: 000=4:3, 001=16:9, 010=16:10, 011=5:4, 100=15:9

Bit 4 CVT-RB reduced blanking (preferred)

Bit 3 CVT standard blanking

Bits 2–0 Reserved, must be 0.

16 Scaling support bitmap

Bit 7 Horizontal shrink

Bit 6 Horizontal stretch

Bit 5 Vertical shrink

Bit 4 Vertical stretch

Bits 3–0 Reserved, must be 0.

17 Preferred vertical refresh rate (1–255)

EDID additional white point descriptor[8]

Bytes Description

0–4 Standard header, byte 3 = 0xFB.

5 White point index number (1–255) Usually 1; 0 indicates descriptor not used.

6 White point CIE xy coordinates least-significant bits (like EDID byte 26)

Bits 7–4 Unused, must be 0.

Bits 3–2 White point x value least-significant 2 bits

Bits 1–0 White point y value least-significant 2 bits

7 White point x value most significant 8 bits (like EDID byte 27)

8 White point y value most significant 8 bits (like EDID byte 28)

9 datavalue = (gamma−1)×100 (1.0–3.54, like EDID byte 23)

10–14 Second descriptor, like above. Index number usually 2.

15–17 Unused, padded with 0A 20 20.

EDID color management data descriptor[8]

Bytes Description

0–4 Standard header, byte 3 = 0xF9.

5 Version: 03

6 Red a3 lsb

7 Red a3 msb

8 Red a2 lsb

9 Red a2 msb

10 Green a3 lsb

11 Green a3 msb

12 Green a2 lsb

13 Green a2 msb

14 Blue a3 lsb

15 Blue a3 msb

16 Blue a2 lsb

17 Blue a2 msb

EDID CVT 3-byte timing codes descriptor[8]

Bytes Description

0–4 Standard header, byte 3 = 0xF8.

5 Version: 03

6-8 CVT timing descriptor #1

6 Addressable lines 8-bit lsb

7 Bits 7–4 Addressable lines 4-bit msb

Bits 3–2 Preferred vertical rate: 00=50 Hz, 01=60 Hz, 10=75 Hz, 11=85 Hz

Bits 1–0 Unused, must be 0.

8 Bit 7 Unused, must be 0.

Bits 6–5 Aspect ratio: 00=16:10; 01=4:3; 10=5:4; 11=16:9

Vertical rate bitmap

Bit 4 50 Hz CVT

Bit 3 60 Hz CVT

Bit 2 75 Hz CVT

Bit 1 85 Hz CVT

Bit 0 60 Hz CVT reduced blanking

9-11 CVT timing descriptor #2

12-14 CVT timing descriptor #3

15-17 CVT timing descriptor #4

EDID Additional standard timings 3[8]

Bytes Description

0–4 Standard header, byte 3 = 0xF7.

5 Version: 10

6 Bit 7 640×350 @ 85 Hz

Bit 6 640×400 @ 85 Hz

Bit 5 720×400 @ 85 Hz

Bit 4 640×480 @ 85 Hz

Bit 3 848×480 @ 60 Hz

Bit 2 800×600 @ 85 Hz

Bit 1 1024×768 @ 85 Hz,

Bit 0 1152×864 @ 85 Hz

7 Bit 7 1280×768 @ 60 Hz (CVT-RB)

Bit 6 1280×768 @ 60 Hz

Bit 5 1280×768 @ 75 Hz

Bit 4 1280×768 @ 85 Hz

Bit 3 1280×960 @ 60 Hz

Bit 2 1280×960 @ 85 Hz

Bit 1 1280×1024 @ 60 Hz

Bit 0 1280×1024 @ 85 Hz

8 Bit 7 1360×768 @ 60 Hz (CVT-RB)

Bit 6 1280×768 @ 60 Hz

Bit 5 1440×900 @ 60 Hz (CVT-RB)

Bit 4 1440×900 @ 75 Hz

Bit 3 1440×900 @ 85 Hz

Bit 2 1440×1050 @ 60 Hz (CVT-RB)

Bit 1 1440×1050 @ 60 Hz

Bit 0 1440×1050 @ 75 Hz

9 Bit 7 1440×1050 @ 85 Hz

Bit 6 1680×1050 @ 60 Hz (CVT-RB)

Bit 5 1680×1050 @ 60 Hz

Bit 4 1680×1050 @ 75 Hz

Bit 3 1680×1050 @ 85 Hz

Bit 2 1600×1200 @ 60 Hz

Bit 1 1600×1200 @ 65 Hz

Bit 0 1600×1200 @ 70 Hz

10 Bit 7 1600×1200 @ 75 Hz

Bit 6 1600×1200 @ 85 Hz

Bit 5 1792×1344 @ 60 Hz

Bit 4 1792×1344 @ 75 Hz

Bit 3 1856×1392 @ 60 Hz

Bit 2 1856×1392 @ 75 Hz

Bit 1 1920×1200 @ 60 Hz (CVT-RB)

Bit 0 1920×1200 @ 60 Hz

11 Bit 7 1920×1200 @ 75 Hz

Bit 6 1920×1200 @ 75 Hz

Bit 5 1920×1440 @ 60 Hz

Bit 5 1920×1440 @ 75 Hz

Bits 3–0 Unused, must be 0.

12-17 Unused, must be 0.

EIA/CEA-861 extension block[edit] The CEA EDID Timing Extension was first introduced in EIA/CEA-861, and has since been updated several times, most notably with the −861B revision (which was version 3 of the extension, adding Short Video Descriptors and advanced audio capability/configuration information), −861D (published in July 2006 and containing updates to the audio segments), −861E, and −861F which was published on June 4, 2013.[10] According to Brian Markwalter, senior vice president, research and standards, CEA, −861F "includes a number of noteworthy enhancements, including support for several new Ultra HD and widescreen video formats and additional colorimetry schemes.”[11] The most recent version, CTA-861-G[12], originally published in November 2016, was made available for free in November 2017 after some necessary changes due to a trademark complaint. Version 1 (as defined in −861) allowed the specification of video timings only through the use of 18-byte Detailed Timing Descriptors (DTD) (as detailed in EDID 1.3 data format above). In all cases, the "preferred" timing should be the first DTD listed in a CEA EDID Timing Extension. Version 2 (as defined in −861A) added the capability to designate a number of DTDs as "native" and also included some "basic discovery" functionality for whether the display device contains support for "basic audio", YCbCr pixel formats, and underscan. Version 3 (from the −861B spec) allows two different ways to specify the timings of available digital TV[clarification needed] formats: As in Version 1 & 2 by the use of 18-byte DTDs, or by the use of the Short Video Descriptor (SVD) (see below). HDMI 1.0 -1.3c uses this[which?] version. Version 3 also includes four new optional types of data blocks: Video Data Blocks containing the aforementioned Short Video Descripter (SVD), Audio Data Blocks containing Short Audio Descriptors (SAD), Speaker Allocation Data Blocks containing information about the speaker configuration of the display device, and Vendor Specific Data Blocks which can contain information specific to a given vendor's use. CEA EDID Timing Extension data format - Version 3[edit]

Byte sequence 00: Extension tag (which kind of extension block this is); 02h for CEA EDID 01: Revision number (Version number); 03h for Version 3 02: Byte number (decimal) within this block where the 18-byte DTDs begin. If no non-DTD data is present in this extension block, the value should be set to 04h (the byte after next). If set to 00h, there are no DTDs present in this block and no non-DTD data. 03: Number of Native DTDs present, other Version 2+ information bit 7: 1 if display supports underscan, 0 if not bit 6: 1 if display supports basic audio, 0 if not bit 5: 1 if display supports YCbCr 4:4:4, 0 if not bit 4: 1 if display supports YCbCr 4:2:2, 0 if not bit 3..0: total number of native formats in the DTDs included in this block 04: Start of Data Block Collection. If byte 02 is set to 04h, this is where the DTD collection begins. If byte 02 is set to another value, byte 04 is where the Data Block Collection begins, and the DTD collection follows immediately thereafter.

The Data Block Collection contains one or more data blocks detailing video, audio, and speaker placement information about the display. The blocks can be placed in any order, and the initial byte of each block defines both its type and its length: bit 7..5: Block Type Tag (1 is audio, 2 is video, 3 is vendor specific, 4 is speaker allocation, all other values Reserved) bit 4..0: Total number of bytes in this block following this byte Once one data block has ended, the next byte is assumed to be the beginning of the next data block. This is the case until the byte (designated in Byte 02, above) where the DTDs are known to begin.

'''Audio Data Blocks''' contain one or more 3-byte Short Audio Descriptors (SADs). Each SAD details audio format, channel number, and bitrate/resolution capabilities of the display as follows: SAD Byte 1 (format and number of channels): bit 7: Reserved (0) bit 6..3: Audio format code 1 = Linear Pulse Code Modulation (LPCM) 2 = AC-3 3 = MPEG1 (Layers 1 and 2) 4 = MP3 5 = MPEG2 6 = AAC 7 = DTS 8 = ATRAC 0, 15: Reserved 9 = One-bit audio aka SACD 10 = DD+ 11 = DTS-HD 12 = MLP/Dolby TrueHD 13 = DST Audio 14 = Microsoft WMA Pro bit 2..0: number of channels minus 1 (i.e. 000 = 1 channel; 001 = 2 channels; 111 = 8 channels)

SAD Byte 2 (sampling frequencies supported): bit 7: Reserved (0) bit 6: 192kHz bit 5: 176kHz bit 4: 96kHz bit 3: 88kHz bit 2: 48kHz bit 1: 44kHz bit 0: 32kHz

SAD Byte 3 (bitrate): For LPCM, bits 7:3 are reserved and the remaining bits define bit depth bit 2: 24 bit bit 1: 20 bit bit 0: 16 bit For all other sound formats, bits 7..0 designate the maximum supported bitrate divided by 8 kbit/s.

'''Video Data Blocks''' will contain one or more 1-byte Short Video Descriptors (SVDs). They are decoded as follows: bit 7: 1 to designate that this should be considered a "native" resolution, 0 for non-native bit 6..0: index value to a table of standard resolutions/timings from CEA/EIA-861:

VIC Display Pixel Pixel Short Aspect Aspect Clock, Name Ratio Ratio MHz V mode @ H

1 DMT0659 4:3 25.175 640x480p @ 59.94/60 Hz 2 480p 4:3 8:9 27.0 720x480p @ 59.94/60 Hz 3 480pH 16:9 32:37 27.0 720x480p @ 59.94/60 Hz 4 720p 16:9 1:1 74.25 1280x720p @ 59.94/60 Hz 5 1080i 16:9 1:1 74.25 1920x1080i @ 59.94/60 Hz 6 480i 4:3 8:9 27.0 720(1440)x480i @ 59.94/60 Hz 7 480iH 16:9 32:37 27.0 720(1440)x480i @ 59.94/60 Hz 8 240p 4:3 8:9 27.0 720(1440)x240p @ 59.94/60 Hz 9 240pH 16:9 32:37 27.0 720(1440)x240p @ 59.94/60 Hz 10 480i4x 4:3 8:9 54.0 (2880)x480i @ 59.94/60 Hz 11 480i4xH 16:9 32:37 54.0 (2880)x480i @ 59.94/60 Hz 12 240p4x 4:3 8:9 54.0 (2880)x240p @ 59.94/60 Hz 13 240p4xH 16:9 32:37 54.0 (2880)x240p @ 59.94/60 Hz 14 480p2x 4:3 8:9 54.0 1440x480p @ 59.94/60 Hz 15 480p2xH 16:9 32:37 54.0 1440x480p @ 59.94/60 Hz 16 1080p 16:9 1:1 148.5 1920x1080p @ 59.94/60 Hz 17 576p 4:3 16:15 27.0 720x576p @ 50 Hz 18 576pH 16:9 64:45 27.0 720x576p @ 50 Hz 19 720p50 16:9 1:1 74.25 1280x720p @ 50 Hz 20 1080i25 16:9 1:1 74.25 1920x1080i @ 50 Hz* 21 576i 4:3 16:15 27.0 720(1440)x576i @ 50 Hz 22 576iH 16:9 64:45 27.0 720(1440)x576i @ 50 Hz 23 288p 4:3 16:15 27.0 720(1440)x288p @ 50 Hz 24 288pH 16:9 64:45 27.0 720(1440)x288p @ 50 Hz 25 576i4x 4:3 16:15 54.0 (2880)x576i @ 50 Hz 26 576i4xH 16:9 64:45 54.0 (2880)x576i @ 50 Hz 27 288p4x 4:3 16:15 54.0 (2880)x288p @ 50 Hz 28 288p4xH 16:9 64:45 54.0 (2880)x288p @ 50 Hz 29 576p2x 4:3 16:15 54.0 1440x576p @ 50 Hz 30 576p2xH 16:9 64:45 54.0 1440x576p @ 50 Hz 31 1080p50 16:9 1:1 148.5 1920x1080p @ 50 Hz 32 1080p24 16:9 1:1 74.25 1920x1080p @ 23.98/24 Hz 33 1080p25 16:9 1:1 74.25 1920x1080p @ 25 Hz 34 1080p30 16:9 1:1 74.25 1920x1080p @ 29.97/30 Hz 35 480p4x 4:3 8:9 108.0 (2880)x480p @ 59.94/60 Hz 36 480p4xH 16:9 32:37 108.0 (2880)x480p @ 59.94/60 Hz 37 576p4x 4:3 16:15 108.0 (2880)x576p @ 50 Hz 38 576p4xH 16:9 64:45 108.0 (2880)x576p @ 50 Hz 39 1080i25 16:9 1:1 72.0 1920x1080i (1250 Total) @ 50 Hz* 40 1080i50 16:9 1:1 148.5 1920x1080i @ 100 Hz 41 720p100 16:9 1:1 148.5 1280x720p @ 100 Hz 42 576p100 4:3 8:9 54.0 720x576p @ 100 Hz 43 576p100H 16:9 32:37 54.0 720x576p @ 100 Hz 44 576i50 4:3 16:15 54.0 720(1440)x576i @ 100 Hz 45 576i50H 16:9 64:45 54.0 720(1440)x576i @ 100 Hz 46 1080i60 16:9 1:1 148.5 1920x1080i @ 119.88/120 Hz 47 720p120 16:9 1:1 148.5 1280x720p @ 119.88/120 Hz 48 480p119 4:3 16:15 54.0 720x480p @ 119.88/120 Hz 49 480p119H 16:9 64:45 54.0 720x480p @ 119.88/120 Hz 50 480i59 4:3 8:9 54.0 720(1440)x480i @ 119.88/120 Hz 51 480i59H 16:9 32:37 54.0 720(1440)x480i @ 119.88/120 Hz 52 576p200 4:3 16:15 108.0 720x576p @ 200 Hz 53 576p200H 16:9 64:45 108.0 720x576p @ 200 Hz 54 576i100 4:3 16:15 108.0 720(1440)x576i @ 200 Hz 55 576i100H 16:9 64:45 108.0 720(1440)x576i @ 200 Hz 56 480p239 4:3 8:9 108.0 720x480p @ 239.76/240 Hz 57 480p239H 16:9 32:37 108.0 720x480p @ 239.76/240 Hz 58 480i119 4:3 8:9 108.0 720(1440)x480i @ 239.76/240 Hz 59 480i119H 16:9 32:37 108.0 720(1440)x480i @ 239.76/240 Hz 60 720p24 16:9 1:1 59.4 1280x720p @ 23.98/24 Hz 61 720p25 16:9 1:1 74.25 1280x720p @ 25Hz 62 720p30 16:9 1:1 74.25 1280x720p @ 29.97/30 Hz 63 1080p120 16:9 1:1 297.0 1920x1080p @ 119.88/120 Hz 64 1080p100 16:9 1:1 297.0 1920x1080p @ 100 Hz

65 720p24 64:27 4:3 59.4 1280x720p @ 23.98/24 Hz 66 720p25 64:27 4:3 74.25 1280x720p @ 25Hz 67 720p30 64:27 4:3 74.25 1280x720p @ 29.97/30 Hz 68 720p50 64:27 4:3 74.25 1280x720p @ 50 Hz 69 720p 64:27 4:3 74.25 1280x720p @ 59.94/60 Hz 70 720p100 64:27 4:3 148.5 1280x720p @ 100 Hz 71 720p120 64:27 4:3 148.5 1280x720p @ 119.88/120 Hz 72 1080p24 64:27 4:3 74.25 1920x1080p @ 23.98/24 Hz 73 1080p25 64:27 4:3 74.25 1920x1080p @ 25Hz 74 1080p30 64:27 4:3 74.25 1920x1080p @ 29.97/30 Hz 75 1080p50 64:27 4:3 148.5 1920x1080p @ 50 Hz 76 1080p 64:27 4:3 148.5 1920x1080p @ 59.94/60 Hz 77 1080p100 64:27 4:3 297.0 1920x1080p @ 100 Hz 78 1080p120 64:27 4:3 297.0 1920x1080p @ 119.88/120 Hz 79 720p2x24 64:27 64:63 59.4 1680x720p @ 23.98/24 Hz 80 720p2x25 64:27 64:63 59.4 1680x720p @ 25Hz 81 720p2x30 64:27 64:63 59.4 1680x720p @ 29.97/30 Hz 82 720p2x50 64:27 64:63 82.5 1680x720p @ 50 Hz 83 720p2x 64:27 64:63 99.0 1680x720p @ 59.94/60 Hz 84 720p2x100 64:27 64:63 165.0 1680x720p @ 100 Hz 85 720p2x120 64:27 64:63 198.0 1680x720p @ 119.88/120 Hz 86 1080p2x24 64:27 1:1 99.0 2560x1080p @ 23.98/24 Hz 87 1080p2x25 64:27 1:1 90.0 2560x1080p @ 25Hz 88 1080p2x30 64:27 1:1 118.8 2560x1080p @ 29.97/30 Hz 89 1080p2x50 64:27 1:1 185.625 2560x1080p @ 50 Hz 90 1080p2x 64:27 1:1 198.0 2560x1080p @ 59.94/60 Hz 91 1080p2x100 64:27 1:1 371.25 2560x1080p @ 100 Hz 92 1080p2x120 64:27 1:1 495.0 2560x1080p @ 119.88/120 Hz 93 2160p24 16:9 1:1 297.0 3840x2160p @ 23.98/24 Hz 94 2160p25 16:9 1:1 297.0 3840x2160p @ 25Hz 95 2160p30 16:9 1:1 297.0 3840x2160p @ 29.97/30 Hz 96 2160p50 16:9 1:1 594.0 3840x2160p @ 50 Hz 97 2160p 16:9 1:1 594.0 3840x2160p @ 59.94/60 Hz 98 2160p24 256:135 1:1 297.0 4096x2160p @ 23.98/24 Hz 99 2160p25 256:135 1:1 297.0 4096x2160p @ 25Hz 100 2160p30 256:135 1:1 297.0 4096x2160p @ 29.97/30 Hz 101 2160p50 256:135 1:1 594.0 4096x2160p @ 50 Hz 102 2160p 256:135 1:1 594.0 4096x2160p @ 59.94/60 Hz 103 2160p24 64:27 4:3 297.0 3840x2160p @ 23.98/24 Hz 104 2160p25 64:27 4:3 297.0 3840x2160p @ 25Hz 105 2160p30 64:27 4:3 297.0 3840x2160p @ 29.97/30 Hz 106 2160p50 64:27 4:3 594.0 3840x2160p @ 50 Hz 107 2160p 64:27 4:3 594.0 3840x2160p @ 59.94/60 Hz 108 720p48 16:9 1:1 90.0 1280x720p @ 47.96/48 Hz 109 720p48 64:27 1:1 90.0 1280x720p @ 47.96/48 Hz 110 720p2x48 64:27 64:63 99.0 1680x720p @ 47.96/48 Hz 111 1080p48 16:9 1:1 148.5 1920x1080p @ 47.96/48 Hz 112 1080p48 64:27 4:3 148.5 1920x1080p @ 47.96/48 Hz 113 1080p2x48 64:27 1:1 198.0 2560x1080p @ 47.96/48 Hz 114 2160p48 16:9 1:1 594.0 3840x2160p @ 47.96/48 Hz 115 2160p48 256:135 1:1 594.0 4096x2160p @ 47.96/48 Hz 116 2160p48 64:27 4:3 594.0 3840x2160p @ 47.96/48 Hz 117 2160p100 16:9 1:1 1188.0 3840x2160p @ 100 Hz 118 2160p120 16:9 1:1 1188.0 3840x2160p @ 119.88/120 Hz 119 2160p100 64:27 4:3 1188.0 3840x2160p @ 100 Hz 120 2160p120 64:27 4:3 1188.0 3840x2160p @ 119.88/120 Hz 121 2160p2x24 64:27 1:1 396.0 5120x2160p @ 23.98/24 Hz 122 2160p2x25 64:27 1:1 396.0 5120x2160p @ 25Hz 123 2160p2x30 64:27 1:1 396.0 5120x2160p @ 29.97/30 Hz 124 2160p2x48 64:27 1:1 742.5 5120x2160p @ 47.96/48 Hz 125 2160p2x50 64:27 1:1 742.5 5120x2160p @ 50 Hz 126 2160p2x 64:27 1:1 742.5 5120x2160p @ 59.94/60 Hz 127 2160p2x100 64:27 1:1 1485.0 5120x2160p @ 100 Hz

193 2160p2x120 64:27 1:1 1485.0 5120x2160p @ 119.88/120 Hz 194 4320p24 16:9 1:1 1188.0 7680x4320p @ 23.98/24 Hz 195 4320p25 16:9 1:1 1188.0 7680x4320p @ 25Hz 196 4320p30 16:9 1:1 1188.0 7680x4320p @ 29.97/30 Hz 197 4320p48 16:9 1:1 2376.0 7680x4320p @ 47.96/48 Hz 198 4320p50 16:9 1:1 2376.0 7680x4320p @ 50 Hz 199 4320p 16:9 1:1 2376.0 7680x4320p @ 59.94/60 Hz 200 4320p100 16:9 1:1 4752.0 7680x4320p @ 100 Hz 201 4320p120 16:9 1:1 4752.0 7680x4320p @ 119.88/120 Hz 202 4320p24 64:27 4:3 1188.0 7680x4320p @ 23.98/24 Hz 203 4320p25 64:27 4:3 1188.0 7680x4320p @ 25Hz 204 4320p30 64:27 4:3 1188.0 7680x4320p @ 29.97/30 Hz 205 4320p48 64:27 4:3 2376.0 7680x4320p @ 47.96/48 Hz 206 4320p50 64:27 4:3 2376.0 7680x4320p @ 50 Hz 207 4320p 64:27 4:3 2376.0 7680x4320p @ 59.94/60 Hz 208 4320p100 64:27 4:3 4752.0 7680x4320p @ 100 Hz 209 4320p120 64:27 4:3 4752.0 7680x4320p @ 119.88/120 Hz 210 4320p2x24 64:27 1:1 1485.0 10240x4320p @ 23.98/24 Hz 211 4320p2x25 64:27 1:1 1485.0 10240x4320p @ 25Hz 212 4320p2x30 64:27 1:1 1485.0 10240x4320p @ 29.97/30 Hz 213 4320p2x48 64:27 1:1 2970.0 10240x4320p @ 47.96/48 Hz 214 4320p2x50 64:27 1:1 2970.0 10240x4320p @ 50 Hz 215 4320p2x 64:27 1:1 2970.0 10240x4320p @ 59.94/60 Hz 216 4320p2x100 64:27 1:1 5940.0 10240x4320p @ 100 Hz 217 4320p2x120 64:27 1:1 5940.0 10240x4320p @ 119.88/120 Hz 218 2160p100 256:135 1:1 1188.0 4096x2160p @ 100 Hz 219 2160p120 256:135 1:1 1188.0 4096x2160p @ 119.88/120 Hz

*Short video descriptors 20 & 39 are both 1920x1080i@50 16:9 but differ in the amount of vertical total lines which are 1125 and 1250, respectively.

Notes: Parentheses indicate instances where pixels are repeated to meet the minimum speed requirements of the interface. For example, in the 720X240p case, the pixels on each line are double-clocked. In the (2880)X480i case, the number of pixels on each line, and thus the number of times that they are repeated, is variable, and is sent to the DTV monitor by the source device.

Increased Hactive expressions include “2x” and “4x” indicate two and four times the reference resolution, respectively.

The CEA/EIA-861/A standard included only numbers 1-7 and numbers 17-22 above (but not as short video descriptors which were introduced in CEA/EIA-861B) and are considered primary video format timings. The CEA/EIA-861B standard has the first 34 short video descriptors above. It is used by HDMI 1.0-1.2a. The CEA/EIA-861C standard has the first 59 short video descriptors above. It is used by HDMI 1.3-1.3c The CEA/EIA-861D standard has the first 64 short video descriptors above. It is used by HDMI 1.4-1.4b The CEA/EIA-861E standard has the first 107 short video descriptors above. It is used by HDMI 2.0-2.0b The CTA-861F standard has the first 193 short video descriptors above. It is used by HDMI 2.1 The CTA-861G standard has the full 219 short video descriptors above. It is used by HDMI 2.1

A '''Vendor Specific Data Block''' (if any) contains as its first three bytes the vendor's IEEE 24-bit registration number, LSB first. For HDMI, it is always 00-0C-03 for HDMI Licensing, LLC. It is followed by a two byte source physical address, LSB first. The source physical address provides the CEC physical address for upstream CEC devices. The remainder of the Vendor Specific Data Block is the "data payload",which can be anything the vendor considers worthy of inclusion in this EDID extension block. HDMI 1.3a specifies some requirements for the data payload. See that spec for detailed info on these bytes: VSD Byte 1-3 IEEE Registration Identifier (LSB First) VSD Byte 4-5 Components of Source Physical Address (See section 8.7 of HDMI 1.3a) VSD Byte 6 (optional) (bits are set if sink supports...): bit 7: Supports_AI (...a function that needs info from ACP or ISRC packets) bit 6: DC_48bit (...16-bit-per-channel deep color) bit 5: DC_36bit (...12-bit-per-channel deep color) bit 4: DC_30bit (...10-bit-per-channel deep color) bit 3: DC_Y444 (...4:4:4 in deep color modes) bit 2: Reserved (0) bit 1: Reserved (0) bit 0: DVI_Dual (...DVI Dual Link Operation) VSD Byte 7 (optional) If non-zero (Max_TMDS_Frequency / 5mhz) VSD Byte 8 (optional) (latency fields indicators): bit 7: latency_fields (set if latency fields are present) bit 6: i_latency_fields (set if interlaced latency fields are present; if set four latency fields will be present, 0 if bit 7 is 0) bits 5-0: Reserved (0) VSD Byte 9 (optional) Video Latency (if indicated, value=1+ms/2 with a max of 251 meaning 500ms) VSD Byte 10 (optional) Audio Latency (video delay for progressive sources, same units as above) VSD Byte 11 (optional) Interlaced Video Latency (if indicated, same units as above) VSD Byte 12 (optional) Interlaced Audio Latency (video delay for interlaced sources, same units as above) Additional bytes may be present, but the HDMI spec says they shall be zero.

If a Speaker Allocation Data Block is present, it will consist of three bytes. The second and third are Reserved (all 0), but the first contains information about which speakers are present in the display device: bit 7: Reserved (0) bit 6: Rear Left Center / Rear Right Center present for 1, absent for 0 bit 5: Front Left Center / Front Right Center present for 1, absent for 0 bit 4: Rear Center present for 1, absent for 0 bit 3: Rear Left / Rear Right present for 1, absent for 0 bit 2: Front Center present for 1, absent for 0 bit 1: LFE present for 1, absent for 0 bit 0: Front Left / Front Right present for 1, absent for 0

Note that for speakers with right and left polarity, it is assumed that both left and right are present.

"d": byte (designated in byte 02) where DTDs begin. 18-byte DTD strings continue for an unspecified length (modulo 18) until a "00 00" is as the first bytes of a prospective DTD. At this point, the DTDs are known to be complete, and the start address of the "00 00" can be considered to be "XX" (see below) "XX"-126: Post-DTD padding. Should be populated with 00h 127: Checksum - This byte must be programmed such that the sum of all 128 bytes equals 00h.

References[edit]

^ "High-Definition Multimedia Interface Specification Version 1.3a" (PDF). 10 November 2006. Archived (PDF) from the original on 2016-05-16. Retrieved 2017-04-01.  ^ "DDC/CI specifications". Boichat.ch. 2004-07-08. Retrieved 2017-04-01.  ^ "read-edid". Polypux.org. Retrieved 2017-04-01.  ^ "Utilities PowerStrip". EnTech Taiwan. 2012-03-25. Retrieved 2017-04-01.  ^ "SwitchResX - The Most Versatile Tool For Controlling Screen Resolutions On Your Mac". Madrau.com. Retrieved 2017-04-01.  ^ Harald Schweder (2003-02-11). "DisplayConfigX". 3dexpress.de. Retrieved 2017-04-01.  ^ Brezenski (2009-08-07). "Custom Resolutions on Intel Graphics". Software.intel.com. Retrieved 2009-11-04.  ^ a b c d e f g h i j VESA E-EDID Standard, Release A, Revision 2. September 25, 2006 ^ VESA Enhanced EDID Standard (PDF), Video Electronics Standards Association, 2000-02-09, p. 32, retrieved 2011-11-19  ^ "A DTV Profile for Uncompressed High Speed Digital Interfaces". 4 June 2013. CEA-861-F. Archived from the original on 2013-08-21. Retrieved 2013-08-15.  ^ Paul Ploumis (2013-07-16). "CEA publishes new high-speed CEA-861-F DTV Interface Standard". Scrapmonster.com. Retrieved 2017-04-01.  ^ "A DTV Profile for Uncompressed High Speed Digital Interfaces" (PDF). 29 November 2017. CTA-861-G. Archived from the original (PDF) on 2017-11-30. Retrieved 2017-11-30. 

External links[edit]

edidreader.com – Web Based EDID Parser

v t e

Display technology

Video displays

Current generation

Eidophor Electroluminescent display (ELD) Electronic paper

E Ink Gyricon

Light emitting diode display (LED) Cathode ray tube (CRT) (Monoscope) Liquid-crystal display (LCD)

TFT TN LED Blue Phase IPS

Plasma display panel (PDP)

ALiS

Digital Light Processing (DLP) Liquid crystal on silicon (LCoS)

Next generation

Organic light-emitting diode (OLED)

AMOLED

Organic light-emitting transistor (OLET) Surface-conduction electron-emitter display (SED) Field emission display (FED) Laser TV

Quantum dot Liquid crystal

MEMS display

IMoD TMOS DMS

Quantum dot display (QD-LED) Ferro liquid crystal display (FLCD) Thick-film dielectric electroluminescent technology (TDEL) Telescopic pixel display (TPD) Laser-powered phosphor display (LPD)

Non-video

Electromechanical

Flip-dot Split-flap Vane

Eggcrate Fiber optic Nixie tube Vacuum fluorescent display (VFD) Light-emitting electrochemical cell (LEC) Lightguide display Dot-matrix display Seven-segment display (SSD) Nine-segment display Fourteen-segment display (FSD) Sixteen-segment display (SISD)

3D display

Stereoscopic Autostereoscopic Multiscopic Hologram

Holographic display Computer-generated holography

Volumetric Musion Eyeliner Fog display

Static media

Movie projector Neon sign Destination sign Slide projector Transparency Laser beam

Display capabilities

EDID

CEA-861

DisplayID DisplayHDR

Related articles

History of display technology Large-screen television technology Optimum HDTV viewing distance High-dynamic-range imaging (HDRI) Color Light Output Flexible display

Comparison of

.