Display Panel Calibration for Flicker-Free Refresh Rate Transitions

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Solution Overview

Problem

Display panels operating at multiple refresh rates, such as 60 Hz and 90 Hz, often experience visual flicker due to differences in optical properties, which can be detrimental to user experience, especially at low luminance settings.

Innovation Solution

The solution involves measuring the optical properties of a display panel at both refresh rates, selecting a corresponding gray level for input gray levels, and adjusting input display data to minimize differences in optical properties during transitions between refresh rates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the display panel operates at multiple refresh rates to improve user experience and reduce power consumption, then energy efficiency and adaptability are improved, but visual flicker and optical property inconsistencies occur during transitions

Engineering Contradiction:

Improvepower consumptionVSAvoidvisual flicker

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by measuring optical properties (luminance, color) at different refresh rates and adjusting input gray levels to compensate for differences. When transitioning between refresh rates, the system modifies display parameters (gray level mappings) based on pre-measured optical characteristics to maintain visual consistency and eliminate flicker while enabling refresh rate switching for power savings

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the display panel switches between different refresh rates for different applications, then adaptability and power efficiency are improved, but optical property differences cause visual inconsistency

Engineering Contradiction:

Improverefresh rate adaptabilityVSAvoidoptical property consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent implements feedback by measuring the actual optical properties (luminance and color) of the display panel at different refresh rates and using these measurements to adjust input gray levels. The system creates a feedback loop where optical measurements inform gray level corrections, ensuring that visual output remains consistent across refresh rate transitions while maintaining application-specific adaptability

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary action by pre-measuring optical properties at various refresh rates and pre-calculating gray level adjustment mappings before transitions occur. This advance preparation allows the system to quickly switch between refresh rates without visual artifacts, as the correction data is already computed and ready for immediate application

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20250182664A1Calibrating Input Display Data for Seamless Transitions in Multiple Display Refresh Rates

Publication Date: 2025.06.05 GOOGLE LLC

AI summary

A method may include measuring an optical property of a display panel for an input gray level at a first refresh rate. The method may also include measuring the optical property for a plurality of candidate gray levels at a second refresh rate. The method may further include selecting, based on the measured optical properties of the display panel, a corresponding gray level for the input gray level, wherein the corresponding gray level is selected from the plurality of candidate gray levels. The method may also include storing, at the device, the corresponding gray level for the input gray level, wherein subsequent to the storing, the device is configured to adjust input display data using the corresponding gray level for the input gray level when the display panel is transitioning from the first refresh rate to the second refresh rate.