Display Power Supply Current Limiting for High-Load Images

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Solution Overview

Problem

Existing display devices consume excessive power due to unregulated current flow, particularly when displaying high-load images, leading to inefficiency and increased power consumption.

Innovation Solution

Implementing a power management system that adjusts the number of active converters and limits current based on load, using a current sensor and power controller to optimize power supply operation, and downscaling image data to reduce current requirements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the power supply outputs high current to display high-load images, then the display performance is improved, but the power consumption increases excessively

Engineering Contradiction:

Improvedisplay performanceVSAvoidpower consumption

Core Design Contradiction:

Illumination intensityVSUse of energy by moving object

Solution Approach 1:

The power supply dynamically adjusts its output current capability based on real-time monitoring of the actual current draw by the display panel. The power controller continuously compares the output current with a reference current and adjusts the allowable current limit accordingly, enabling the system to optimize power consumption while maintaining required display performance.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the operating parameters of the power supply by adjusting the allowable current limit based on the load characteristics. When the display panel draws current below the reference current, the power supply reduces its allowable current limit, thereby changing its operational state to consume less power while still meeting the display requirements.

Inventive Principle:

Principle #35Parameter changes

2Power

If the power supply allows high current flow, then the current demand of high-load images is met, but overcurrent conditions cause power loss

Engineering Contradiction:

Improvecurrent supply capabilityVSAvoidpower loss

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The power supply employs a feedback mechanism where the power controller continuously monitors the output current and compares it with the reference current. Based on this feedback, the controller adjusts the allowable current limit to prevent overcurrent conditions, thereby eliminating unnecessary power loss while ensuring sufficient current supply for the actual display load.

Inventive Principle:

Principle #23Feedback

3Reliability

If the power supply maintains high allowable current, then current demands are always met, but power consumption increases even when not needed

Engineering Contradiction:

Improvecurrent supply reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The power supply transitions from a static high-current mode to a dynamic current limiting mode based on actual demand. The power controller continuously adjusts the allowable current limit according to the ratio of actual current to reference current, ensuring reliable current supply when needed while reducing power consumption when the display load is low.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20260018138A1Display device and electronic device including the same

Publication Date: 2026.01.15 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel, a power supply, and a power controller. The power supply receives a first power voltage through an input terminal and outputs a second power voltage supplied to the display panel to an output terminal. The power controller varies an allowable current of the power supply by comparing a current output through the output terminal with a reference current.