平板
电脑支撑架
DPMS™ Standard VESA®
Video Electronics Standards Association
2150 North First Street, Suite 440Phone: (408) 435-0333 San Jose, CA 95131-2029FAX: (408) 435-8225 Display Power Management Signaling (DPMS) Standard
Version: 1.0
Revision 1.0
Date: August 20, 1993
Purpose
To standardize on a common definition and methodology in which the display controller sends a signal to the display that enables it to enter various power management states.
Summary
Government agencies and independent organizations worldwide are involved in setting limits or goals for power consumption in office equipment. Desktop computers are one of the primary targets for this effort. The display consumes a significant portion of the power used in a desktop computer system. These agencies would like to decrease energy use from computer displays specifically, in order to slow the growth in overall demand for electric power.
While these goals are laudable, it would be difficult to achieve widespread adoption and use of power management technology in displays without a standard interface between the display controller and the display.
This standard complements these initiatives by defining power management states as they relate to the display and providing a standard method for the display controller to signal to the display to enter
into those states. This standard strictly covers the communication between the display controller and the display.
Intellectual Property
© Copyright 1993 - Video Electronics Standards Association. Duplication of this document within VESA member companies for review purposes is permitted. All other rights reserved. Trademarks
All trademarks used in this document are property of their respective owners.
VESA, DPMS Video Electronics Standards Association
Patents
VESA proposals and standards documents are adopted by the Video Electronics Standards Association without regard to whether their adoption may involve patents on articles, materials, or processes. Such adoption does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the proposals or standards document. Support for this Specification
If you have a product which incorporates DPMS, you should ask the company that manufactured your product for assistance. If you are a display or controller manufacturer, VESA can assist you with any clarification you may require. All questions must be in writing to VESA, in order of preference by:
E-mail:vesa-support@exodus
FAX:408-435-8225
Mail to:VESA
2150 N. First Street, Suite 440
San Jose, CA 95131-2029
Acknowledgments
This document was made possible by the joint efforts of the members of VESA Monitor Committee. In particular, the following individuals and their companies contributed with time and knowledge.
DPMS Work Group Leader
Jean McLaughlin, Capetronic Computer Products
Work Group Members
Andy Morrish, formerly Apple Computer
Bob Myers, Hewlett Packard
Ed Anwyl, IBM
Anders Frisk, ICL
Richard Atanus, NEC
Paul Doyle, Sony
Page ii of 12
Table of Contents
Section T itle Page Intellectual Property ii Trademarks ii Patents ii
Support for this Specification ii
Acknowledgments ii
Table of Contents iii 1.0Introduction and Scope4 1.1DPMS Architecture (PC example)4 1.2Activation Criteria and Power Consumption Requirements4 1.3Computer Systems Supported5 1.4Synchronization Formats Supported5
1.5Programming Interface5
2.0Terms and Definitions5 2.1Advanced Power Management (APM)5 2.2Synchronization Signals5 2.2.1Pulses5 2.2.2No Pulses6 2.2Blanked Video6 2.3Display Controller6 2.4Display6
2.5Host System6
3.0Display Power Management States6 3.1On6 3.2Stand-By6 3.3Suspend6
3.4Off6
4.0Display Power Management Summary7
Appendix A: Override Capability (optional)8
Appendix B: Pseudo Stand-by State8
Appendix C: Related Documents/Other Organizations8
Appendix D: Questions and Answers9
Appendix E: Revision History12
Page iii
1.0Introduction and Scope
The purpose of this document is to provide a standard for the hardware signaling of display power management states for use with a continuously refreshed display system employing horizontal and vertical synchronization signals and streamed video data. This document describes the use of these signals to define power management states based on the existing Advanced Power Management specification.
1.1DPMS Architecture (PC example)
The following diagram illustrates how DPMS can fit into a PC power management architecture.
Figure 1. DPMS Architecture
(PC Example)
1.2Activation Criteria and Power Consumption Requirements
This document does not specify criteria for entering into the various power management states, nor does it specify absolute levels of power consumption. The signaling method has been defined independently of the criteria and power levels as these requirements may change over time or with market needs.
Page 4 of 12
1.3Computer Systems Supported
DPMS is intended to be independent of computer platform and operating system.
变压器温控仪1.4Synchronization Formats Supported This standard applies to all synchronization (sync) formats: separate horizontal and vertical sync, composite sync, and sync on green.
1.5Programming Interface
This standard defines a hardware signaling method between the display controller and the display. No programming interface is defined within this document.
2.0Terms and Definitions
2.1Advanced Power Management (APM)
APM is a specification created by Microsoft and Intel that provides an environment for power management of personal computers by the system BIOS, operating system or applications. In the context of this document, the power management states have been identified as follows: APM State Power Savings Recovery Time
On None Not Applicable
Stand-by Minimal Short recovery
Suspend Substantial Longer recovery allowed
Off Maximum System dependent
Table 2. APM State Summary
NOTE: Absolute power savings and recovery times are not defined by APM, similarly, DPMS has adopted the same guidelines. Actual parameters may be determined by regional or customer requirements.
It is expected that after a user defined or default idle period, the host system will initiate power management, although other criteria are allowed.
The definitions for “On”, “Stand-by,” “Suspend” and “Off” States used in this specification adhere as closely as possible to the definitions in the APM specification. While these definitions were developed primarily for use in portable computing, the need for power management has crossed over into the desktop arena and the terminology also applies well in this environment.
一体化机芯
2.2Synchronization Signals
The basis of the DPMS standard is the condition of the synchronization signals to the display. Two conditions are defined: pulses and no pulses
2.2.1Pulses
Pulses for the Horizontal sync signal are defined as greater than 10 kHz repetition frequency. Pulses
for the Vertical sync signal are defined as greater than 40 Hz repetition frequency.
Page 5 of 12
豫公网安备41160202000603
站长QQ:729038198
关于我们
投诉建议