Display Voltage Generator With Ripple-Canceling Compensation Current

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Solution Overview

Problem

Voltage ripples occur during the emission period in power voltage applied to pixels, leading to deteriorated display quality in display panels.

Innovation Solution

A voltage generator is introduced that generates a compensation current to stabilize the power voltage by opposing the phase of the ripple current, thereby maintaining stable power current and improving display quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a voltage generator applies power voltage to the display panel during emission period, then the display panel can operate, but voltage ripples occur and display quality deteriorates

Engineering Contradiction:

Improvedisplay operationVSAvoiddisplay quality

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful voltage ripple into a beneficial compensation signal. The voltage generator detects the ripple current phase and generates a compensation current that is opposite in phase to the ripple current, thereby canceling out the voltage ripple and improving display quality while maintaining normal display operation

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the parameter of the power voltage by dynamically adjusting it based on the detected ripple current. The voltage generator modifies the power voltage parameter in real-time by adding the compensation current to counteract the ripple, thereby maintaining stable voltage during emission period

Inventive Principle:

Principle #35Parameter changes

2Reliability

If the voltage generator outputs compensation current to counteract ripple current, then power voltage stability improves, but device complexity increases

Engineering Contradiction:

Improvepower voltage stabilityVSAvoidvoltage generator structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The voltage generator is designed to perform multiple functions: it normally generates power voltage for the display panel and additionally generates compensation current to counteract ripples. By integrating these functions into a single voltage generator circuit, the patent avoids adding separate ripple suppression components, thereby limiting the increase in device complexity while achieving stable power voltage

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent implements a feedback mechanism where the voltage generator detects the ripple current phase and automatically adjusts its output to generate compensation current. This closed-loop feedback system enables automatic ripple suppression without requiring complex external control circuits, maintaining voltage stability while managing device complexity

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS20250391332A1Power voltage generator, display apparatus including the same and electronic apparatus including the same

Publication Date: 2025.12.25 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus includes a display panel including a pixel and a display panel driver which drives the display panel. The display panel driver includes a voltage generator which applies a power voltage based on a power current to the display panel. When the pixel emits light, the voltage generator generates a compensation current. The power voltage is applied to the display panel based on the compensation current.