Display Device Flicker Prevention via Odd-Even Row Scanning
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Solution Overview
Problem
Display devices experience flicker issues when switching from high to low frequency or when displaying specific patterns during low-frequency driving, leading to reduced luminance and potential flicker visibility.
Innovation Solution
A display device and driving method that alternately dispose odd and even pixel rows, calculate gray differences, detect edges and patterns, and adjust scan signals based on threshold conditions to prevent flicker by optimizing sub-frame periods and scan signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device displays a still image at a low frequency to save power, then power consumption is reduced, but a flicker may occur
Solution Approach 1:
The patent dynamically adjusts the display driving frequency based on image content characteristics. For still images without problematic patterns, low-frequency driving is used to save power. When flicker-risk patterns are detected, the system switches to high-frequency alternating drive mode, creating a dynamic adaptation strategy that resolves the contradiction between power savings and flicker prevention.
Solution Approach 2:
The patent changes the scanning parameter from sequential row-by-row scanning to alternating odd-even row scanning when flicker risk is detected. This parameter change in the driving mode allows the system to maintain low-frequency operation for power efficiency while eliminating the flicker effect through the alternating scan pattern.
2Reliability
If the display device displays a still image at a high frequency to prevent flicker, then flicker is prevented, but power consumption increases
Solution Approach 1:
The patent applies different driving strategies to different regions or patterns within the displayed image. By analyzing local pattern characteristics (such as detecting specific grayscale relationships in adjacent rows), the system applies alternating odd-even row scanning only where necessary to prevent flicker, while maintaining efficient sequential scanning in other areas, thus optimizing the balance between flicker prevention and power consumption.
3Reliability
If alternating odd and even pixel rows are used to prevent flicker, then flicker visibility is reduced, but device complexity increases
Solution Approach 1:
The patent performs preliminary analysis of the image content before selecting the driving mode. By pre-detecting whether the displayed image contains patterns that may cause flicker (through grayscale difference calculation and pattern recognition), the system determines in advance whether to use alternating odd-even row scanning or sequential scanning, simplifying the control logic by making the decision beforehand rather than requiring complex real-time switching mechanisms.
Data Source
AI summary
Provided is a display device including a pixel unit in which each of pixel rows extends in a first direction, odd numbered pixel rows and even numbered pixel rows are alternately disposed in a second direction, and pixels included in the pixel rows are designated as dots having two or more units, a gray difference calculator that calculates difference between representative grays of dots adjacent in the second direction among dots of a p-th pair of the pixel rows, an edge detector that increases an edge dot number when a first condition in which the difference between the representative grays is larger than a first threshold value is satisfied, and a first pattern detector that increases an edge number when the edge dot number is larger than a second threshold value, and that generates a first pattern detection signal when the edge number is larger than a third threshold value.