DisplayPort Extension Packets for Power and Frame Control
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Solution Overview
Problem
As display devices increase in resolution and color bits, existing data transmission standards like DisplayPort face challenges in efficiently managing higher data rates and power usage, particularly in controlling power states and updating display frames across devices.
Innovation Solution
The use of extension packets in the DisplayPort specification, which allow for vendor-specific header bytes to define commands and formats, enabling control of power usage, delta frame updates, and register configurations, is employed to manage power states and transmit data efficiently between source and target devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DisplayPort standards are used to transport video and audio data between source and target devices, then data transmission capability is improved, but control efficiency and power management capability deteriorate due to reliance on slow auxiliary channels
Solution Approach 1:
The patent combines the data transmission function and control function into a single communication channel. Extension packets are transmitted through the Main Link alongside video and audio data, eliminating the need for separate auxiliary channels for control operations. This merging allows control commands for power management, delta frame updates, and register configurations to be sent efficiently through the same high-bandwidth channel used for media data.
2Adaptability or versatility
If traditional auxiliary channels are used for plug-and-play operations and control, then device compatibility is improved, but power management efficiency and control speed worsen due to channel limitations
Solution Approach 1:
The patent merges control operations with the main data transmission channel. Extension packets carrying control commands are multiplexed with video and audio data on the Main Link, allowing power management and device control to benefit from the higher bandwidth and faster response time of the main channel while maintaining compatibility through standardized packet formats.
Solution Approach 2:
The patent enables preliminary control actions by allowing the source device to send control commands ahead of time through extension packets. Power state transitions, frame update configurations, and register settings can be prepared and transmitted in advance, reducing latency and improving overall system responsiveness compared to traditional auxiliary channel operations.
3Manufacturing precision
If resolution and color bits of display devices are increased, then display quality is improved, but data rate requirements and power consumption worsen
Solution Approach 1:
The patent applies preliminary action by enabling the source device to pre-configure power states and transmit control commands for high-resolution displays before data transmission begins. Extension packets allow the source to negotiate and set optimal power levels, frame update strategies, and data transmission parameters in advance, reducing the power required to sustain high-resolution operation.
Solution Approach 2:
The patent implements periodic action through delta frame updates, where only changed portions of the display frame are transmitted at high resolution rather than complete frames. Extension packets enable efficient negotiation of update intervals and selective frame transmission, reducing average power consumption while maintaining perceived display quality through high refresh rates for updated content.
Data Source
AI summary
A computer can control a target device using a packet format described herein. In one example, an extension packet controls the target device in at least one of power consumption, image rendering, and register updating.