DisplayPort 1.2 规范详解

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"Display Port 1.1a标准已被Display Port 1.2取代，Display Port 1.2标准由视频电子标准协会(VESA)提供免费下载，非成员可从VESA或Display Port网站购买。" Display Port是视频电子标准协会(VESA)推出的一种数字接口标准，用于在源设备（如电脑）和接收设备（如显示器、投影仪）之间传输视频、音频和其他数据。Display Port 1.1a是该标准的一个早期版本，但已经被Display Port 1.2所替代。Display Port 1.2标准提供更高的带宽和增强的功能，允许更灵活的数据传输。 Display Port标准的核心目标是定义一个开放的数字通信接口，适应各种内部和外部显示连接需求。内部连接包括个人电脑或显示器内部的接口，而外部连接涵盖了电脑与显示器、电脑与电视、甚至DVD播放器与电视显示设备之间的接口。 Display Port 1.1a的主要特性包括： 1. 高速数字信号传输：支持高清视频和多通道音频流，确保高质量的视觉体验。 2. 双模式操作：支持LVDS (Low-Voltage Differential Signaling) 和TMDS (Transition Minimized Differential Signaling) 两种信号传输方式，以兼容不同的硬件。 3. 可扩展性：设计有菊花链功能，允许多个显示器通过单一源设备连接，简化多显示器设置。 4. 电源管理：支持DP++（DisplayPort++），允许通过Display Port接口供电，减少线缆数量。 5. 数据加密：使用AES-128位加密，保障传输数据的安全性。 Display Port 1.2的改进包括： 1. 带宽提升：从Display Port 1.1a的10.8 Gbps提升至21.6 Gbps，支持4K分辨率和更高的刷新率。 2. 多流传输(MST)：允许多个独立的视频流同时传输，进一步增强了菊花链连接的多显示器能力。 3. 高动态范围(HDR)支持：提高色彩深度和对比度，提供更真实的图像质量。 4. 支持USB Type-C：通过集成USB-C接口，实现数据、视频和电源的统一传输。 Display Port标准的发展反映了显示器技术的进步，不断适应高清、超高清和高帧率的需求，以及对多显示器环境和便携式设备连接性的要求。Display Port 1.2的推出，标志着接口技术的重要进步，提升了用户体验并简化了设备间的连接。

VESA DisplayPort Standard Version 1.1a

• Numbering of Audio Samples in Table 2-40 corrected.

 Link Training/Link Quality Measurement

• Figure 3-10, Figure 3-11, and associated texts in Section 3.5.1.3 corrected.

• Criteria for setting and clearing CR_LOCK_DONE, SYMBOL_LOCK_DONE, and

INTERLANE_ALIGNMENT_DONE bits clarified in Section 3.5.1.3.

• Per-lane-drive setting adjustment clarified as optional.

• Table 2-53 added to clarify which Link Training and Link Quality Measurement patterns are encoded

and/or scrambled.

 Main Link Physical Layer

• Table 3-10, Table 3-11 and Table 3-13 corrected.

• UI Accuracy and SSC range clarified: UI accuracy high limit is +300ppm and low limit -5300ppm,

after comprehending SSC (spread-spectrum clocking) SSC modulation amplitude range is 0% ~ 0.5%

and modulation frequency range 30kHz ~ 33kHz.

• TP2 EYE measurement method updated in Section 3.5.3.10..

• TP2 EYE Mask height and width for High Bit Rate and Reduced Bit Rate in Table 3-14and Table

3-15. corrected.

• TP3 EYE Mask for Reduced Bit Rate Table 3-17 corrected.

• Compliance EYE Mask for Embedded Connection recommendation added in Section 3.5.3.10.1

• Receiver jitter tolerance curves corrected in Figure 3-17 (for High Bit Rate) Figure 3-18 (for

Reduced Bit Rate).

 AUX CH Physical Layer

• Table 3-3 corrected.

• Sink-sideAC-coupling capacitors on AUX CH lines mandated.

• Cycle-to-cycle jitter specificaiton of AUX CH clarified.

 Cable Electrical

• Insertion and return loss mask equations for High Bit Rate cable corrected in Section 4.1.5.1.1 and

Section 4.1.5.1.2, respectively.

• Reduced Bit Rate cable insertion-/return-loss specification corrected in Section 4.1.6.1

 Source Detection

• Source Detection mechanism as shown in Figure 3-2 and the text right beneath corrected.

 DP_PWR and Power Management

• Rules of DP_PWR State for Source and Sink Devices in Sections 2.3.1.1 and 2.3.1.2 added for

clarification,

• Power management clarifications added in Section 5.1.5 (Sink Device power management by a

Source Deivce) and Ssection 5.2.5 (Sink Device power save mode).

• Requireent on an HPD assertion by a Sink Device added in Section 9.1 235: A Sink Device must keep

the HPD signal asserted unless it is in an OFF.

• DP_PWR for Box-to-Box DisplayPort Connection specification for a Source Device corrected as

+3.3V+/-10% in Section 3.2.

• DP_PWR User detection method in Section 3.2.1 clarified.

 Connector Pin-out

VESA DisplayPort Standard Version 1.1a

1 Introduction

DisplayPort is an industry standard to accommodate the growing broad adoption of digital display technology

within the PC and CE industries. It consolidates internal and external connection methods to reduce device

complexity, supports necessary features for key cross industry applications, and provides performance

scalability to enable the next generation of displays featuring higher color depths, refresh rates, and display

resolutions.

1.1 DisplayPort Specification Organization

The DisplayPort specification is organized into the following sections that define the overall architecture and

structure of the display interface:

Section 1 –Introduction

The introduction section defines the high level industry needs for DisplayPort, and the resulting technical

objectives that the protocol, electrical, and mechanical sections are intended to satisfy. This section also

includes a glossary of terms for the overall specification, references, and overview of DisplayPort architecture.

Section 2 –Link Layer

The link layer section describes the protocol specification for configuring and managing the flow of data over

both the forward (host to display) transport channel and the auxiliary bi-directional channel.

Section 3 – Physical Layer

The physical layer section describes the electrical specification of the DisplayPort transmitter and receiver

implementations. It also defines the required circuitry and encoding methodology for transmitting data to and

from the DisplayPort Link Layer over a cable or circuit board traces.

Section 4 – Mechanical

The mechanical section defines the connector and cable specification for both internal and external

DisplayPort connectors used to convey the electrical signals defined by the DisplayPort physical layer.

Section 5 – Source/Sink Device Interoperability

The device and link media requirements section describes the device and display formats required to support

interoperability between source and Sink Devices that implement DisplayPort connections.

1.2 DisplayPort Objectives

This DisplayPort specification defines a scalable digital display interface with optional audio and content

protection capability for broad application within PC and consumer electronic (CE) devices. The interface is

designed to support both internal chip-to-chip and external box-to-box digital display connections. Potential

internal chip-to-chip applications include usage within a notebook PC for driving a panel from a graphics

controller, and usage within a monitor or TV for driving the display component from a display controller.

Examples of box-to-box applications for DisplayPort include display connections between PCs and monitors,

projectors, and TV displays. DisplayPort is also suitable for display connections between consumer

electronics devices such as high definition optical disc players, set top boxes, and television displays.

DisplayPort is designed to meet several key needs within the PC and CE industries as defined in section 1.2.1.

These industry needs are expanded into a set of technical objectives in section 1.2.2 for the DisplayPort

specification to ensure that the display interface can support current and future industry requirements.

VESA DisplayPort Standard Version 1.1a

Specific objectives for external and internal display connections are defined in sections 1.2.3 and 1.2.4

respectively for the DisplayPort specification. Section 1.2.5 defines the additional objectives for CE devices

applications.

1.2.1 Key Industry Needs for DisplayPort

The following PC and CE industry needs were considered in the development of the DisplayPort architecture

and resulting interface specification:

1) Drive maximum application and re-use of digital technology to enable reduced device costs

associated with implementing a digital display connection.

2) Enable a common signaling methodology for both internal and external display connections to reduce

device complexity and promote commoditization.

3) Enable an extensible architecture that supports an optional robust content protection capability that

may be economically implemented.

4) Enable high quality optional digital audio transmission capability.

5) Enable higher levels of silicon integration and innovation within rendering and display devices to

reduce device complexity and enable digital interface commoditization.

Examples of potential DisplayPort integration capability include transmitter integration within a

graphics or display controller, and receiver integration within a timing controller on a module.

6) Simplify cabling for internal and external digital display connections.

7) Address performance concerns with existing technologies by providing higher bandwidth over fewer

wires.

8) Apply embedded clock architecture to reduce electromagnetic interference (EMI) susceptibility and

physical wire count.

9) Provide a small form factor connector that can be plugged in by feel, and whose design will enable

four connectors to be placed on a full height Peripheral Component Interconnect (PCI) card bracket.

10) Enable broad PC and CE industry via an open and extensible industry standard.

DisplayPort addresses these industry needs by defining an electrical and protocol specification that may be

readily implemented in module timing controllers, graphics processors, media processors, and display

controllers.

A forward drive channel is defined that is scalable from one to four lanes, and implements a micro-packet

architecture that supports variable color depths, refresh rates, and display pixel formats. A bi-directional

auxiliary channel is defined that also implements micro-packet architecture for flexible delivery of control

and status information.

DisplayPort includes a mechanical specification that defines a small, user-friendly external connector that is

optimized for use on thin profile notebooks in addition to allowing up to four connectors on a graphics card.

A standard module connector for internal applications is also defined in the mechanical section of the

specification.

1.2.2 DisplayPort Technical Objectives

The cross industry needs defined for DisplayPort above may be translated into specific technical objectives.

These technical objectives for DisplayPort are:

VESA DisplayPort Standard Version 1.1a

1) Provide a high bandwidth forward transmission link channel, with a bi-directional auxiliary channel

capability.

2) Provides application support for up to 10 Gbps (giga bits per second) forward link channel throughput

to address long term PC industry needs to support greater than QXGA (2048 x 1536) pixel format and

greater than 24 bit color depths.

3) Provides application support for up to 1 Mbps (mega bit per second) auxiliary channel throughput

with a maximum latency of 500 micro-seconds

4) Supports variable color depth transmission of 6, 8, 10, 12 or 16 bits per component

5) Supports EMI compliance to FCC/CISPR B standard with a margin of at least 6db

6) Supports existing VESA and CEA standards where applicable.

7) Architecture that does not preclude legacy transmission support (e.g. DVI and LVDS) to and from

DisplayPort components.

8) Supports hot plug and unplug detection and link status failure detection

9) Supports full bandwidth transmission via direct drive over a two meter cable.

10) Supports reduced bandwidth transmission via direct drive over a 15 meter cable. DisplayPort supports

a minimum of 1080p lines at 24bpp, 50 / 60 Hz over 4 lanes at 15 meters.

11) Supports audio skew of less than 1ms

12) Supports a bit error rate of 10

-9

for raw transport per lane, and 10

-12

symbol error rate for audio and

control data after ECC encoding / decoding.

13) Supports sub 65 nanometer (0.065 micron) process technologies for integration in Source Devices,

and supports 0.35 micron process technologies for integration in Sink Devices.

1.2.3 DisplayPort External Connection Objectives

For external connections between a Source Device and a Sink Device, the DisplayPort specification is

designed to achieve the following technical objectives:

1) Supports reading of the display EDID (Extended Display Identification Data) whenever the display is

connected to power, even trickle a.c. power.

2) Supports DDC/CI (Display Data Channel / Command Interface) and MCCS (Monitor Command and

Controls Set) command transmission.

3) Supports external display configurations that do not include scaling, a discrete display controller, or

on screen display (OSD) functions, enabling low cost, digital monitors.

4) For external notebook PC applications, DisplayPort allows support for direct drive through a docking

connector configuration. A repeater function in the dock is strongly recommended.

5) The external DisplayPort connector is identical for all display applications and provides support for

four lanes. Captive cables may support one. Two or four lanes to reduce cost.

6) The external DisplayPort connector includes a multi-purpose power pin.

7) The external DisplayPort connector is symmetrical such that the same connector may be used on both

source and Sink Devices.

8) The external DisplayPort connector supports connection without the need for visual alignment.

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DisplayPort 1.2 规范详解

Display Port 2.0 Spec

display_port_1.4_spec.pdf

[VESA] DisplayPort v1.4_spec.pdf

mkdir launch touch display_rviz2.launch.py

var display_text = document.querySelector('#display_text'); //display_text.style.display = 'flex'; display_text.style.width = '30%'; display_text.style.border-radius = "0"; 该代码有什么问题，为什么会报错

display_frame = tk.Frame(root) display_frame.pack(padx=10, pady=10) display_label = tk.Label(display_frame, text="已录入学生信息：") display_label.pack() display_text_area = tk.Text(display_frame, height=5, width=30) display_text_area.pack() display_text_area.config(state=tk.DISABLED)

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