E-EDID 1.4标准详解：显示屏开发必备

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"EDID1.4是视频电子标准协会（VESA）发布的一个扩展显示识别数据标准，用于定义显示器的特性、功能和支持的视频时序模式。这个标准为显示器提供了一个可远程读取的数据文件，帮助视频源设备正确配置图形处理单元，以生成适合显示器的视频格式。EDID1.4包含了128字节的基本数据结构，并扩展了额外的数据块，以提供更多详细信息。" 在EDID1.4中，主要包含以下几个关键知识点： 1. **EDID（Extended Display Identification Data）**：EDID是显示器自我描述的一种方式，它包含了显示器的基本信息，如制造商、型号、分辨率、颜色深度等。EDID1.4是该标准的第四个修订版本，对前一版本进行了扩展和增强。 2. **VESA（Video Electronics Standards Association）**：VESA是一个制定视频和图形接口标准的组织，负责推广和维护EDID标准。 3. **数据结构**：EDID1.4由一个基础数据块（Block 0）和可能的扩展数据块组成，基础数据块为128字节，包含显示器的基本信息。扩展数据块可以提供更详细的信息，如色彩管理数据、3D功能等。 4. **内容元素**：基础数据块中的内容包括显示器的制造商信息（制造商ID和产品ID）、物理尺寸、最大像素时钟、基本视频模式、特征与扩展信息等。扩展数据块可以包含更多自定义信息，如制造商的附加信息、显示器的色域和色深等。 5. **视频源配置**：视频源设备，如显卡或计算机，通过读取EDID信息来了解显示器的能力，从而调整输出信号的格式和时序，确保最佳的显示效果。 6. **兼容性**：EDID1.4标准旨在确保显示器与各种视频源设备之间的兼容性，包括不同的视频标准（如VGA、DVI、HDMI等）和分辨率。 7. **更新和修订**：Release A, Revision 2是EDID1.4的第二个修订版，通常会修复之前版本的问题，增加新的功能或改进现有功能，以适应不断发展的显示技术。 8. **应用领域**：对于开发写入EDID的显示器开发者来说，理解EDID1.4标准至关重要，这有助于他们创建符合标准的产品，确保其能够无缝集成到各种视频系统中。通过理解以上知识点，开发者可以更有效地编写和解析EDID，以实现显示器与视频源设备之间的有效通信，确保显示设置的正确性和优化用户体验。

VESA Enhanced EDID Standard Release A, Rev.2

Table 2.2 - EDID Structures – Comparison Table

ASE EDID Structure

1.0 1.1 1.2 1.3 1.4

Block “0” Header

☺ ☺ ☺ ☺



ID Manufacturer

☺ ☺ ☺ ☺



ID Product Code

☺ ☺ ☺ ☺



ID Serial Number

4 4 4 4 4

Week of Manufacture

4 4 4 4 4

Year of Manufacture or Model Year

☺ ☺ ☺ ☺



EDID version

    

EDID revision

    

Basic Display Parameters & Features

☺ ☺ ☺ ☺



Display x, y Chromaticity Coordinates

(Phosphor or Filter Chromaticity)

☺ ☺ ☺ ☺



Established Timings

4 4 4 4 4

Standard Timing Identifications

4 4 4 4 4

Preferred Timing Descriptor Block

4 4 4

 

Range Limits Descriptor Block n/a

4 4

 ☯

Monitor Name Descriptor Block n/a

4 4

 ☯

Other Descriptor Blocks n/a

4 4 4 4

Extension flag

☺ ☺ ☺ ☺



Checksum

☺ ☺ ☺ ☺



Table 2.3 - EDID Structures – Comparison Table - Key



Explicit requirement --- mandatory (a “shall”)

☺

No requirement stated but commonly understood to be a requirement

☯

Optional but recommended

Optional

n/a Not applicable

2.1.7 Compatibility of EDID 1.x Data Structures --- Handling Updates to EDID Data

Structures

On occasion, VESA will publish updates (revisions) to the E-EDID Standard. Some of these updated

standards may contain new EDID structure definitions. When VESA publishes a new EDID structure

with a new revision number (and the version number stays the same), the new EDID structure is

backward compatible (key E

LEMENTS only). For legacy support, an older host system (that recognizes

EDID version 1, revision 3, for example) connected to a display product with a newer EDID structure

(for example; version 1, revision 4), the host shall decode the EDID data using the older EDID structure

definitions (for example; version 1, revision 3 definitions).

When doing this, the host (graphics system driver or operating system) EDID read and decode may

result in some errors. The host (graphics system driver or operating system) may not understand certain

ELEMENTS or data fields within the EDID Block. The host shall ignore these ELEMENTS or data fields.

The “Plug & Play” process must still work.

If an internet connection is available, the older host may search for a driver that can decode the newer

EDID structure.

An older host (source) shall never shut down a connected video output port when it detects a display

with a newer EDID structure which the host may not completely understand. For more information on

this subject, refer to the VESA PnP Standard or appropriate standard or document for the interface or

application in question.

VESA Enhanced EDID Standard Release A, Rev.2

2.2 EDID EXTENSION Blocks

E-EDID, based on EDID structure 1.4, allows additional data to be stored using multiple (one or more)

XTENSION Blocks attached to BASE EDID in a single file. In the minimum configuration, E-EDID

consists of just one data Block --- the B

ASE EDID, also known as Block 0. Each Block is 128 bytes in

length.

2.2.1 EDID EXTENSIONS: Order of the Blocks

EXTENSION Blocks are arranged sequentially after Block 0. BASE EDID is stored in Block 0 and is the

only mandatory Block. Table 2.4 describes the

Enhanced EDID high level layout of the required BASE

EDID Block and optional E

XTENSION Blocks.

Table 2.4 – E-EDID High Level Layout

Segment Pointer /

Addresses

Block

Number

‘N’

EDID 1.3

Block

Description

EDID 1.4

Block

Description

00h / 00h → 7Fh

0 B

ASE EDID 1.3 Structure BASE EDID 1.4 Structure

EXTENSION Block 1 if N = 1 or EXTENSION Block 1 or

00h / 80h → FFh

Block Map 1 if 2 ≤ N ≤ 127 Block Map 1 (Optional)

01h / 00h → 7Fh

2 E

XTENSION Block 2 EXTENSION Block 2

01h / 80h → FFh

3 EXTENSION Block 3 EXTENSION Block 3

02h / 00h → 7Fh

4 E

XTENSION Block 4 EXTENSION Block 4

●●h / 00h → 7Fh ●●●

EXTENSION Block ●●● EXTENSION Block ●●●

●●● ●●● ●●● ●●●

3Fh / 80h → FFh

127 EXTENSION Block 127 EXTENSION Block 127

Block Map 2 (Optional) or

40h / 00h → 7Fh

128 Block Map 2 if 129 ≤ N ≤ 254

XTENSION Block 128

40h / 80h → FFh

129 EXTENSION Block 129 EXTENSION Block 129

●●h / 00h → 7Fh ●●●

XTENSION Block ●●● EXTENSION Block ●●●

●●● ●●● ●●● ●●●

7Eh / 80h → FFh

253 E

XTENSION Block 253 EXTENSION Block 253

7Fh / 00h → 7Fh

254 EXTENSION Block 254 EXTENSION Block 254

7Fh / 80h → FFh

255 Block 255 is not available.

If Block Maps are not used then Block

255 is an E

XTENSION Block.

If Block Maps are used then Block 255

is not available.

Notes to Table 2.4:

1. Refer to VESA’s E-DDC Standard for more information on the Segment Pointer and Addresses

shown in Table 2.4.

2. For EDID 1.3, if the maximum value of N is ‘1’, then Block 1 contains an Extension Block as

defined in sections 2.2.2 and 2.2.4. If the maximum value of N is more than or equal to ‘2’ and less

than or equal to ‘127’, then Block 1 is Block Map 1. If the maximum value of N is more than or

equal to ‘129’ and less than or equal to ‘254’, then Block 128 is Block Map 2. Block Maps are

considered to be E

XTENSION Blocks to the base EDID and shall be included in the EXTENSION

Block Flag at address 7Eh in the Base EDID (Block 0).

3. For EDID 1.4, Block Maps are optional. Blocks 1 and 128 may contain optional Extension Blocks

as defined in sections 2.2.3 and 2.2.4 or they may contain Block Maps.

4. All Blocks shall be sequentially stored with no gaps or empty Blocks.

5. A partial list of defined Extension Blocks is shown in Table 2.7.

6. The variable ‘N’ in table 2.4 contains the total number of E

XTENSION Blocks listed at address 7Eh

of the B

ASE EDID (Block 0). This includes Block Map/s when present.

VESA Enhanced EDID Standard Release A, Rev.2

2.2.2 EDID Extensions: General Extension Block Format

Several EXTENSION Blocks have already been defined to contain specific kinds of data. Refer to section

2.2.4 for a list of E

XTENSION Blocks. All EXTENSION Blocks except the EXTENSION Block Map shall

include one byte for the E

XTENSION Block revision number.

Table 2.5 - EDID Structure – General Extension Block Format

Address Byte # Value Description

00h

Refer to section 2.2.4 EXTENSION Block Tag Number

00h → FFh

Revision number for this E

XTENSION Block. One byte binary

number. Revisions shall be backward compatible (partial).

01h

Block Tag Number Exception: EXTENSION Block Map --- EXTENSION Blocks 1

& 128

00h → FFh

XTENSION Block Data

02h →

7Eh

2 →

126

Block Tag Number Exception: EXTENSION Block Map --- EXTENSION Blocks 1

& 128

7Fh

127

00h → FFh

Checksum for this E

XTENSION Block

2.2.3 EDID Extensions: EDID Block Map Extension

The EXTENSION Block Map (in EXTENSION Blocks #1 & #128) is an optional ELEMENT for EDID

structure (Version 1, Revision 4). The E

XTENSION Block Map (in EXTENSION Blocks #1 & #128) is a

required E

LEMENT for EDID structure (Version 1, Revision 3).

An E

XTENSION Block map is a special EXTENSION Block that lists tag numbers for all EXTENSION

Blocks are stored in a particular display’s EDID memory. The tag number entries of the E

XTENSION

Block Map, prepared by the display manufacturer, shall match the tag numbers of all E

XTENSION

Blocks that are stored in a display’s memory. For a partial listing of E

XTENSION Block Tag Numbers

refer to Section 2.2.4.

Table 2.6 - EDID Structure – Block Map Extension

Address Byte # Value Description

00h

F0h EXTENSION Block Tag Number designates “EXTENSION Block

Map”

01h

1 Block Tag Number

XTENSION Block Tag Number for the data stored in

XTENSION block 2 or block 129

02h

Block Tag Number

EXTENSION Block Tag Number for the data stored in

EXTENSION block 3 or block 130

●●● ●●● ●●● ●●●

7Eh

126

Block Tag Number

EXTENSION Block Tag Number for the data stored in

EXTENSION block 127 or block 254

7Fh

127

00h → FFh

Checksum for this E

XTENSION Block Map

Notes to Table 2.6:

1. A partial list of assigned E

XTENSION Block Tag Numbers is listed in Section 2.2.4. Contact the VESA

Office for the latest list of E

XTENSION Block Tag Numbers.

2. All E

XTENSION Block Tag Numbers shall be sequentially listed (in the Block Map EXTENSION) in the

order that the E

XTENSION Blocks are stored in EDID memory.

3. Addresses without Block Tag Numbers shall be padded with ‘00h’.

VESA Enhanced EDID Standard Release A, Rev.2

3. Extended Display Identification Data (EDID) Version 1 Revision 4

3.1 EDID Format Overview

Table 3.1 - EDID Structure Version 1, Revision 4

Address Bytes Description Format

00h 8 Header: = (00 FF FF FF FF FF FF 00)h

See Section 3.3

08h 10 Vendor & Product Identification:

See Section 3.4

08h 2 ID Manufacturer Name ISA 3-character ID Code

0Ah 2 ID Product Code Vendor assigned code

0Ch 4 ID Serial Number 32-bit serial number

10h 1 Week of Manufacture Week number or Model Year Flag

11h 1 Year of Manufacture or Model Year Manufacture Year or Model Year

12h 2 EDID Structure Version & Revision:

See Section 3.5

12h 1 Version Number: = 01h Binary

13h 1 Revision Number: = 04h Binary

14h 5 Basic Display Parameters & Features:

See Section 3.6

14h 1 Video Input Definition See Section 3.6.1

15h 1 Horizontal Screen Size or Aspect Ratio Listed in cm. → Aspect Ratio --- Landscape

16h 1 Vertical Screen Size or Aspect Ratio Listed in cm. → Aspect Ratio --- Portrait

17h 1 Display Transfer Characteristic (Gamma) Binary --- Factory Default Value

18h 1 Feature Support See Section 3.6.4

19h 10 Color Characteristics:

See Section 3.7

19h 1 Red/Green: Low Order Bits Rx1 Rx0 Ry1 Ry0 Gx1 Gx0 Gy1Gy0

1Ah 1 Blue/White: Low Order Bits Bx1 Bx0 By1 By0 Wx1 Wx0 Wy1 Wy0

1Bh 1 Red-x: High Order Bits Red-x Bits 9 → 2

1Ch 1 Red-y: High Order Bits Red-y Bits 9 → 2

1Dh 1 Green-x: High Order Bits Green-x Bits 9 → 2

1Eh 1 Green-y: High Order Bits Green-y Bits 9 → 2

1Fh 1 Blue-x: High Order Bits Blue-x Bits 9 → 2

20h 1 Blue-y: High Order Bits Blue-y Bits 9 → 2

21h 1 White-x: High Order Bits White-x Bits 9 → 2

22h 1 White-y: High Order Bits White-y Bits 9 → 2

23h 3 Established Timings

See Section 3.8

23h 1 Established Timings I

24h 1 Established Timings II

25h 1 Manufacturer's Reserved Timings

26h 16 Standard Timings: Identification 1 → 8

See Section 3.9

36h 72 18 Byte Data Blocks

See Section 3.10

36h 18 Preferred Timing Mode

48h 18 Detailed Timing # 2 or Display Descriptor

5Ah 18 Detailed Timing # 3 or Display Descriptor

6Ch 18 Detailed Timing # 4 or Display Descriptor

7Eh 1

Extension Block Count N

If Block Maps are used then

00h ≤ N ≤ FEh and FFh is invalid.

If Block Maps are not used then

00h ≤ N ≤ FFh.

Number of (optional) 128-byte EDID

EXTENSION blocks to follow – if Block

Maps are used then 254 is the maximum

value of ‘N’. If Block Maps are not used

then 255 is the maximum value of ‘N’.

7Fh 1

Checksum C

00h ≤ C ≤ FFh

The 1-byte sum of all 128 bytes in this

EDID block shall equal zero

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