HP Dc7900 An Overview of Current Display Interfaces
HP Dc7900 - Compaq Business Desktop Manual
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HP Dc7900 manual content summary:
- HP Dc7900 | An Overview of Current Display Interfaces - Page 1
An Overview of Current Display Interfaces Introduction 2 The Future of Display Interfaces 2 Monitor and TV Market Trends 2 VGA 4 DVI 6 HDMI 9 DisplayPort 11 Display Interface Comparison Table 13 - HP Dc7900 | An Overview of Current Display Interfaces - Page 2
- the majority of desktop monitors will remain under 30-inch diagonal. Some increase in resolution (pixel formats) will likely occur, but most monitors will maintain the current norms - 1680 x 1050 to 1920 x 1200 resolution for widescreen displays in the 20-inch to 27-inch size range, with the top - HP Dc7900 | An Overview of Current Display Interfaces - Page 3
accelerate over the next few years. (Support for legacy products will be provided via adapters between dual-mode DisplayPort products and their older DVI counterparts.) • The HDMI connector has already displaced DVI, for the most part, in consumer HDTV gear. HDMI will continue to grow in popularity - HP Dc7900 | An Overview of Current Display Interfaces - Page 4
performance, particularly for video timings and formats over 1280 x 1024 resolution. However, fully-digital interfaces (currently DVI-D or the digital section of DVI-I, but soon changing to the DisplayPort interface in PC applications and HDMI for TV/CE products) are the most probable long-term - HP Dc7900 | An Overview of Current Display Interfaces - Page 5
Table 1 VGA Connector Pinout Pin Signal 1 Red video 2 Green video 3 Blue video 4 Unused (n.c.) 5 Return 6 Red return 7 Green return 8 Blue return 9 +5 VDC 10 Sync. return 11 Unused 12 DDC Data (SDA) 13 Horizontal sync (TTL) 14 Vertical sync (TTL) 15 DDC Clock (SCL) 5 - HP Dc7900 | An Overview of Current Display Interfaces - Page 6
display interface for PC monitors. However, the DDWG group has not met for over five years, and may be considered defunct. Further development of the DVI specification to the newer DisplayPort standard, and has already been virtually replaced in the CE/ TV market by HDMI. Figure 3 DVI-D Connector 6 - HP Dc7900 | An Overview of Current Display Interfaces - Page 7
16 4 TMDS Data 4- 17 5 TMDS Data 4+ 18 6 DDC clock (SCL) 19 7 DDC data (SDA) 20 8 Vertical sync (DVI-I only) 21 9 TMDS Data 1- 22 10 TMDS Data 1+ 23 11 TMDS Data 1/3 shield 24 12 TMDS Data 3- 13 TMDS Data 3+ TMDS data pairs 3, 4, and 5 are only present or active in "dual - HP Dc7900 | An Overview of Current Display Interfaces - Page 8
Table 3 DVI-I (only) Pinout Pin Signal C1 Red video (analog) C2 Green video (analog) C3 Blue video (analog) C4 Horizontal sync (TTL) C5 Common return 8 - HP Dc7900 | An Overview of Current Display Interfaces - Page 9
DVI, HDMI (up to the 1.2 specification revision) provides support for up to 165 MHz pixel rates, or about 4.8 Gbit/sec. raw data capacity. The HDMI 1.3 spec is intended to approximately double this capacity, although it is unlikely that existing HDMI cables, etc., will support the higher rates. HDMI - HP Dc7900 | An Overview of Current Display Interfaces - Page 10
2- 19 4 TMDS Data 1+ 5 TMDS Data 1 shield 6 TMDS Data 1- 7 TMDS Data 0+ 8 TMDS Data 0 shield 9 TMDS Data 0- 10 TMDS Clock+ 11 TMDS Clock shield 12 TMDS Clock- 13 CEC 14 Reserved (no connect) 15 DDC clock (SCL) 16 DDC data (SDA) Signal DDC/CEC ground +5 VDC Hot plug detect - HP Dc7900 | An Overview of Current Display Interfaces - Page 11
protocol to enable support for multiple displays per physical connection, tiling, conditional update, etc., with full backward compatibility with the original spec. DisplayPort was also designed to be both an external (monitor, TV, etc.) connection as well as an internal (panel-level) interface - HP Dc7900 | An Overview of Current Display Interfaces - Page 12
pins 2, 4, 6 ... 20 Table 5 DisplayPort Connector Pinout Pin Pin Source Sink 1 12 2 11 3 10 4 9 5 8 6 7 7 6 8 5 9 4 10 3 11 2 12 1 Signal Lane 0+ Note difference in Lane 0-3 connections, source side vs. sink. Cable assemblies do not carry DP Power (pin 20), which is - HP Dc7900 | An Overview of Current Display Interfaces - Page 13
connector with latch. Capacity/ bandwidth Indef.; usually OK to about 150+ MHz pixel rates. 4.8 Gbit/sec. (single-link); 9.6 Gbit/sec. (duallink) 4.8 Gbit/sec. through HDMI 1.2; HDMI 1.3 spec to ~9.6 Gbit/sec. Up to 10.8 Gbit/sec. if all four lanes used. Electrical layer 0.7 Vp-p analog video - HP Dc7900 | An Overview of Current Display Interfaces - Page 14
© 2007 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as
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An Overview of Current Display Interfaces
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
The Future of Display Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Monitor and TV Market Trends
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
VGA
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DVI
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
HDMI
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DisplayPort . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Display Interface Comparison Table
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13