Display Panel Driver Frequency Adaptation for Flicker Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in maintaining high display quality, particularly when operating in variable frequency modes, due to issues with driving frequency variability and its impact on image quality.
Innovation Solution
A display device comprising a display panel and a panel driver that operates in either a fixed frequency mode or a variable frequency mode. The panel driver includes an emission driving circuit, a data driving circuit, and a driving controller that adjusts the driving frequency and polarity inversion operations based on counted operation cycles and threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates in variable frequency mode to reduce power consumption, then power efficiency is improved, but display quality deteriorates due to frequency variability
Solution Approach 1:
The display device dynamically adjusts the driving frequency of the light emitting elements based on the displayed content characteristics. The frequency is varied between a first frequency and a second frequency depending on whether the current frame requires high temporal resolution, allowing power savings during static content while maintaining quality during dynamic content.
Solution Approach 2:
The invention changes the operating frequency parameter of the display device based on content analysis. A frequency determination unit analyzes each frame to determine appropriate frequency settings, switching between different frequency modes to optimize both power consumption and display quality for different content types.
2Reliability
If the driving frequency is fixed to maintain stable operation, then display quality is maintained, but power consumption increases
Solution Approach 1:
Instead of using a fixed driving frequency, the system dynamically adapts the frequency based on actual display needs. The frequency determination unit monitors content characteristics and adjusts the driving frequency in real-time, using higher frequencies only when necessary for dynamic content and lower frequencies for static content to reduce power consumption.
Solution Approach 2:
The operating frequency parameter is changed based on content analysis results. The system switches between a first driving frequency and a second driving frequency depending on the temporal complexity of the displayed content, optimizing the balance between display quality and power consumption.
3Use of energy by moving object
If the driving frequency is varied to reduce power consumption, then energy efficiency is improved, but flicker occurs in the displayed image
Solution Approach 1:
The invention implements periodic frame repetition at the higher frequency to counteract flicker effects. When operating in variable frequency mode, the system displays certain frames multiple times at the first (higher) frequency to ensure sufficient temporal sampling, preventing perceptible flicker while still achieving power savings during lower activity periods.
Solution Approach 2:
The system carefully controls the frequency variation parameter to stay above the flicker fusion threshold for perceptible content. The frequency determination unit ensures that frequency changes are made in a way that maintains temporal resolution sufficient to prevent flicker perception while still enabling power savings during static display periods.
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
The solution enhances display quality by allowing the display device to adapt to variable frequency modes while maintaining image quality, reducing flicker, and minimizing power consumption.
Implementation Method 1
a light emitting display device may display an image using a light emitting diode that generates light by recombination of electrons and holes
Data Source
AI summary
A display device includes a display panel receiving an emission driving signal, and a panel driver driving the display panel in a mode in which the driving frequency is varied. The panel driver includes an emission driving circuit outputting the emission driving signal, a data driving circuit outputting a data signal, and a driving controller. The data driving circuit inverts a polarity of the data signal in units of at least one driving frame in response to a first option signal. The driving controller includes a counting circuit which counts an operation cycle of the emission driving circuit to output a count value, and a first option control circuit which compares the count value with a preset first threshold value and sets the first option signal to an active state or an inactive state according to a comparison result.