USB-C Display Power Switching During Intermittent AC Failures

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Solution Overview

Problem

In scenarios where a USB Type-C display experiences intermittent AC power failures, the host system, such as a laptop, cannot sustain the high power consumption of the display, leading to the display turning off and requiring manual content transfer upon power resumption, which negatively impacts user experience and battery life.

Innovation Solution

The computing system automatically configures itself to be a power source for the external display during AC power failures, reducing the display's power consumption by lowering brightness, resolution, and refresh rate, and reconfiguring back to normal operation when power is restored.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the USB Type-C display is powered by AC supply and operates at high power consumption (60W-100W), then the display can maintain normal operation and content presentation, but the host system with small battery capability cannot sustain the power consumption during AC power failures

Engineering Contradiction:

Improvedisplay power consumptionVSAvoiddisplay operation continuity

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The display dynamically adjusts its power consumption characteristics based on power availability. When AC power is detected, the display operates at full power (60W-100W) with normal brightness, resolution, and refresh rate. When AC power failure is detected, the display automatically reduces power consumption and transitions to a low power state, allowing the host system to maintain the display connection without requiring manual intervention.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The display changes operational parameters (brightness, resolution, refresh rate) based on power source availability. During AC power operation, the display uses optimal parameters for quality output. During battery power operation, the display modifies these parameters to reduce power draw, enabling sustained operation during intermittent AC power failures without requiring host system reconfiguration.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If the display turns OFF during AC power failure to conserve host battery power, then the host system can extend battery life, but the user experience deteriorates due to manual content transfer requirements when power resumes

Engineering Contradiction:

Improvehost battery power consumptionVSAvoidcontent transfer operation

Core Design Contradiction:

Use of energy by moving objectVSEase of operation

Solution Approach 1:

The display performs self-service by automatically detecting AC power failures and transitioning to a low power state without requiring host system intervention. The display maintains its enumerated status and content buffer even during power failures, automatically recovering when AC power returns. This eliminates the need for users to manually transfer content between displays and prevents host system mode switching, thereby extending battery life while maintaining ease of operation.

Inventive Principle:

Principle #25Self-service

3Use of energy by moving object

If the host system enters DC mode during AC power failure, then the host can operate on battery power, but the display content must be manually transferred to internal display and back when AC power resumes

Engineering Contradiction:

Improvehost battery power consumptionVSAvoidcontent transfer time

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The display prepares for potential AC power failures by maintaining its content buffer and enumerated status in advance. When AC power failure occurs, the display is already in a state that allows immediate resumption of operation without requiring content transfer. This preliminary preparation eliminates the time loss associated with manual content transfer between displays during intermittent power failures.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If the display maintains normal power consumption during AC power failures, then the display can continue operating at full performance, but the host system battery depletes faster due to inability to sustain high power consumption

Engineering Contradiction:

Improvedisplay operation continuityVSAvoidhost battery power consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The display dynamically adapts its power consumption to match available power supply capacity. The display monitors AC power availability and automatically adjusts its operational state accordingly. During AC power operation, the display consumes 60W-100W at full performance. During AC power failures, the display transitions to a low power state that the host battery can sustain, maintaining operation continuity while preventing excessive battery depletion.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12596420B2Managing sink side and source side display power delivery in response to intermittent power failures

Publication Date: 2026.04.07 INTEL CORP

AI summary

Systems, apparatuses and methods may provide for technology that configures a computing system to be a power sink from an external display, detects an alternating current (AC) power failure with respect to the external display, and configures the computing system to be a power source for the external display in response to the AC power failure. In one example, the technology places the external display in a low power state after the AC power failure is detected.