Variable Emission Control for Display Panel Flicker Reduction
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Solution Overview
Problem
Organic light emitting elements in display panels often cause instantaneous afterimages and flicker due to emitting light only once per frame, which degrades motion clarity and can lead to color blurring at varying luminance levels.
Innovation Solution
A display apparatus and method that adjust the number of emissions per frame based on luminance, emitting light multiple times in middle luminance ranges to prevent afterimages and flicker, and single times in low luminance ranges to prevent color blurring, using a display panel with a gate driver, data driver, and emission driver controlled by a driving controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the organic light emitting element emits light once in a single frame, then the device complexity is reduced, but instantaneous afterimage and flicker occur and motion clarity is deteriorated
Solution Approach 1:
The patent applies dynamics by making the emission cycle variable rather than fixed. The emission driver dynamically adjusts the number of emissions per frame based on the luminance range of the current frame, transitioning from single emission in high luminance ranges to multiple emissions in low luminance ranges. This dynamic adaptation resolves the contradiction by optimizing display quality for different luminance conditions without requiring complex fixed multi-emission structures.
Solution Approach 2:
The patent changes the parameter of emission frequency based on luminance conditions. By detecting the luminance range and adjusting the emission cycle accordingly (1 emission for high luminance, 2-4 emissions for low luminance), the system resolves the technical contradiction. This parameter change allows simple single-emission operation when sufficient, while enabling multiple emissions only when needed for display quality, avoiding unnecessary complexity.
2Reliability
If the organic light emitting element emits light multiple times in a single frame, then motion clarity is improved, but color blurring occurs in low luminance ranges
Solution Approach 1:
The patent applies local quality by applying different emission strategies to different luminance ranges. Instead of uniformly applying multiple emissions across all frames, the system selectively applies multiple emissions only to low luminance ranges where they are beneficial for motion clarity, while using single emission for high luminance ranges where they would cause color blurring. This localized approach resolves the contradiction by making the emission behavior context-dependent.
Solution Approach 2:
The patent resolves the contradiction by changing the emission parameter based on luminance detection. The emission driver adjusts the emission cycle dynamically: using longer emission cycles (single emission) for high luminance ranges to prevent color blurring, and shorter emission cycles (multiple emissions) for low luminance ranges to improve motion clarity. This conditional parameter change eliminates the trade-off.
3Device complexity
If the emission cycle is fixed for all luminance ranges, then the device complexity is reduced, but display quality deteriorates across varying luminance levels
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic emission control mechanism that adapts to luminance conditions. The emission driver automatically detects the luminance range and adjusts the emission cycle accordingly, providing optimal display quality for each luminance level without requiring manual intervention or complex fixed multi-emission hardware. The dynamic nature allows simple operation when possible while enabling quality optimization when needed.
Solution Approach 2:
The patent changes the emission parameter (number of emissions per frame) based on luminance detection. The system uses a single emission for high luminance ranges to maintain simplicity, and switches to multiple emissions for low luminance ranges to enhance display quality. This conditional parameter change resolves the contradiction by making the system adaptive rather than fixed, achieving quality improvement without proportional complexity increase.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances display quality by reducing afterimages and flicker while maintaining motion clarity and preventing color blurring across different luminance levels.
Implementation Method 1
An organic light emitting element of a pixel may emit light once in a single frame
Data Source
AI summary
A display apparatus includes a display panel, a gate driver, a data driver, an emission driver and a driving controller. The display panel includes a gate line, a data line, an emission line and a pixel electrically connected to the gate line, the data line and the emission line. The gate driver outputs a gate signal to the gate line. The data driver outputs a data voltage to the data line. The emission driver outputs an emission signal to the emission line. The driving controller determines a number of emission in a single frame of the emission signal according to a luminance of a display image.