eDP Source Calibration for Fast Initialization
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Solution Overview
Problem
Existing Embedded DisplayPort (eDP) calibration methods are not optimized for link calibration between known eDP sources and sinks, leading to inefficiencies in performance and manufacturing time, and do not account for specific cabling configurations within closed systems.
Innovation Solution
A method and apparatus for calibrating embedded interface operations by determining minimum receiver requirements, configuring receive path components, and calibrating transmitter settings based on these requirements to establish a stable link, with the option to store calibrated settings for later use, specifically tailored for eDP devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DisplayPort calibration sequence is used for eDP, then interoperability margin is maintained, but calibration efficiency and manufacturing time are reduced
Solution Approach 1:
The patent applies local quality by transitioning from a universal DisplayPort calibration sequence to a specialized eDP calibration sequence tailored to specific receiver requirements. The calibration is customized for known eDP sources and sinks with specific cabling configurations, optimizing parameters locally rather than using a generic approach, thereby improving calibration efficiency while maintaining sufficient reliability for the closed system.
Solution Approach 2:
The patent changes calibration parameters by determining minimum receiver requirements and configuring receive path components specifically for eDP. This involves adjusting transmitter settings based on actual receiver needs rather than maintaining fixed DisplayPort margins, allowing optimized calibration parameters that improve efficiency without sacrificing necessary reliability for the embedded system.
2Adaptability or versatility
If full DisplayPort functionality is implemented, then adaptability is improved, but power consumption and device complexity increase
Solution Approach 1:
The patent extracts only the essential calibration functions needed for eDP operation, removing unnecessary DisplayPort calibration steps and features. By taking out only the minimum required receiver requirements and essential receive path configuration, the system achieves adequate adaptability for embedded applications while reducing power consumption and complexity associated with full DisplayPort functionality.
Solution Approach 2:
The patent applies partial action by implementing a simplified calibration sequence that performs only the necessary minimum receiver requirement determination and essential transmitter setting calibration. This partial calibration approach provides sufficient adaptability for closed eDP systems without the excessive power consumption and complexity of complete DisplayPort calibration and full functionality support.
3Device complexity
If receiver requirements are not determined, then calibration process is simplified, but link performance and device robustness deteriorate
Solution Approach 1:
The patent applies preliminary action by determining minimum receiver requirements and configuring receive path components before final transmitter calibration. This preliminary determination of receiver characteristics enables optimized calibration settings that improve link performance and device robustness, while the structured approach keeps the overall process manageable despite the additional steps.
Data Source
AI summary
Methods and apparatus for calibration of interface operation of a display device. In one exemplary embodiment of the invention, an embedded DisplayPort (eDP) source element (such as a graphics processing unit (GPU)) configures itself to support the minimum requirements necessary to support a sink element (such as a screen display). Unlike prior art solutions, minimum sink requirements are identified during a calibration process, and the source is configured accordingly. By tailoring the source to the specific requirements of the sink, the device can initialize faster, consume less power, etc. Moreover, in another aspect of the present invention, if a device does not initialize to an expected configuration based on prior calibration settings, the device can be flagged as having faulty or failing components.