Gamma Voltage Correction for Display Flicker

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Solution Overview

Problem

Flickering phenomenon occurs in display panels when the refresh rate changes, causing brightness inconsistencies and a poor display effect.

Innovation Solution

A gamma voltage correction method that pre-stores data for different vertical blanking intervals and refresh rates, using interpolation to determine and adjust gamma voltages in real-time, ensuring consistent brightness across refresh rate changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the refresh rate of the display panel is dynamically adjusted to match video card refresh rate, then screen tearing and fluctuation are solved and smoothness is improved, but leakage currents of different sizes are generated causing brightness differences and flickering

Engineering Contradiction:

Improverefresh rate matchingVSAvoidbrightness consistency

Core Design Contradiction:

ProductivityVSIllumination intensity

Solution Approach 1:

The patent changes the gamma voltage parameter dynamically according to the vertical blanking interval to compensate for brightness variations. By adjusting the gamma voltage based on the detected interval, the display maintains consistent brightness across different refresh rates while preserving the variable refresh rate functionality.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements a feedback mechanism by detecting the actual vertical blanking interval in real-time and using this information to adjust the gamma voltage accordingly. This closed-loop control ensures that brightness remains consistent even as the refresh rate changes to match the video card.

Inventive Principle:

Principle #23Feedback

2Illumination intensity

If gamma voltage data is pre-stored for multiple refresh rates, then brightness consistency is maintained, but storage requirements increase

Engineering Contradiction:

Improvebrightness consistencyVSAvoidstorage memory

Core Design Contradiction:

Illumination intensityVSQuantity of substance

Solution Approach 1:

The patent pre-calculates and stores only the essential gamma voltage values corresponding to different vertical blanking intervals. By preparing the correction data in advance for only the necessary refresh rates, it reduces the overall storage requirement compared to storing data for all possible refresh rate combinations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent applies different gamma voltage corrections locally based on the specific vertical blanking interval detected. Instead of using a single global correction table for all refresh rates, it selectively applies appropriate corrections based on the actual operating conditions, reducing the amount of data that needs to be stored.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11676551B2Gamma voltage correction method and device, and display device

Publication Date: 2023.06.13 SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD

AI summary

Embodiments of the present disclosure provide a gamma voltage correction method and device, and a display device, wherein a candidate refresh rate last determined in a current frame period of a display panel is used as a target refresh rate, and a gamma voltage corresponding to the target refresh rate is used as a gamma voltage at a display phase in a next frame period of the display panel to perform brightness correction, so that flashing of the display panel during refresh rate switching is prevented, and storage resources are saved.