HDMI中所說的EDID是什麼

EDID是Extended Display Identification Data的縮寫，意為擴充顯示辨別資料，符合VESA标準資料格式。通常存儲在顯示器的固件中，辨別供應商資訊、最大圖像大小、顔色設定、廠商預設定、頻率範圍的限制以及顯示器名和序列号的字元串。EDID從誕生至今，已經經曆了多次的版本更疊，關于版本資訊可以在EDID的字元串中獲得。

EDID由128Bytes主塊和128Bytes的擴充塊組成，按照EDID協定标準每固定bytes為一組，辨別特定的資訊。

例如，對電腦的EDID解析結果如下：

//Displaying Monitor EDID//


128 bytes EDID Data (Hex):

      0   1   2   3   4   5   6   7   8   9 

  0: 00  FF  FF  FF  FF  FF  FF  00  09  E5
 10: B9  08  00  00  00  00  1E  1D  01  04
 20: A5  22  13  78  03  BB  85  A5  55  4F
 30: 9F  27  0F  50  54  00  00  00  01  01
 40: 01  01  01  01  01  01  01  01  01  01
 50: 01  01  01  01  99  3B  80  10  71  38
 60: 50  40  30  20  36  00  58  C2  10  00
 70: 00  1A  00  00  00  00  00  00  00  00
 80: 00  00  00  00  00  00  00  00  00  00
 90: 00  00  00  FE  00  42  4F  45  20  43
100: 51  0A  20  20  20  20  20  20  00  00
110: 00  FE  00  4E  56  31  35  36  46  48
120: 4D  2D  4E  36  39  0A  00  EA

Decoded EDID data


     <---Header--->
     Header:                   00 FF FF FF FF FF FF 00 
     <-x-Header-x->

     <---Vendor/Product Identification--->
     ID Manufacturer Name:     BOE
     ID Product Code:          2233
     ID Serial Number:         00000000
     Week of Manufacture:      30
     Year of Manufacture:      2019
     <-x-Vendor/Product Identification-x->

     <---EDID Structure Version/Revision--->
     EDID Version#:            1
     EDID Revision#:           4
     <-x-EDID Structure Version/Revision-x->

     <---Basic Display Parameters/Features--->
     Video i/p definition:       Analog
     Setup:                      Blank-to-Black not expected
     Seperate Syncs. support:    No
     Composite Sync. support:    Yes
     Vsync. Pulse:               serration not required
     Max Horz Image Size:        34 cm.
     Max Vert Image Size:        19 cm.
     Display Gamma:                      2.2
     Display Type:                       Monochrome
     Standard Default Color Space:       No
     Features, Preferred Timing Mode:    In first detailed block
     Features, GTF support:              Yes
     DPMS Features, Stand-by:    No
     DPMS Features, Suspend:     No
     DPMS Features, Active Off:  No
     <-x-Basic Display Parameters/Features-x->

     <---Color Characteristics--->
     Red x:              0.646484
     Red y:              0.334961
     Green x:            0.310547
     Green y:            0.624023
     Blue x:             0.154297
     Blue y:             5.85938e-002
     White x:            0.313477
     White y:            0.329102
     <-x-Color Characteristics-x->

     <---Established Timings--->
     Established Timimgs 1:  00
     Established Timimgs 2:  00
     Established Timings 3:          00
     <-x-Established Timings-x->

     <---Standard Timing Identification--->
     <-x-Standard Timing Identification-x->

     <---Detailed Timing Descriptions--->
     Detailed Timing:       1920x1080 @60Hz
     Detailed Timing:00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
     Detailed Timing:       FE (Monitor string) 'BOE CQ'
     Detailed Timing:       FE (Monitor string) 'NV156FHM-N69'
     <-x-Detailed Timing Descriptions-x->
     Extension Flag:        00
     Checksum:              EA