Display Device Signal Controller Pattern-Based Inversion Mode Switching
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Solution Overview
Problem
Display devices using polarity inversion modes can suffer from image quality deterioration, particularly when specific patterns are displayed, leading to screen flickering due to uniform polarity of pixels showing gray levels like white.
Innovation Solution
A display device with a signal controller that calculates the ratio of specific patterns in an image and adjusts the inversion mode based on these ratios, switching between reference and modified inversion modes to optimize image quality by altering the polarity of data voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity inversion mode is used to prevent image quality deterioration, then general image quality is improved, but screen flickering occurs when specific patterns are displayed
Solution Approach 1:
The patent implements dynamic inversion mode selection that adapts to different display patterns. The system detects whether the current frame contains vulnerable patterns (such as white text on black background) and switches between reference inversion mode and modified inversion mode accordingly. This dynamic adjustment prevents screen flickering for specific patterns while maintaining the benefits of polarity inversion for general image quality.
Solution Approach 2:
The patent changes the inversion mode parameter based on the detected pattern type. When vulnerable patterns are detected, the system switches from reference inversion mode to modified inversion mode, altering how pixel polarities are inverted. This parameter change eliminates the harmful flickering effect for specific patterns while preserving image quality improvement for other content.
2Reliability
If reference inversion mode is used for all frames, then image quality is maintained, but screen flickering occurs for specific patterns like white text on black background
Solution Approach 1:
The system dynamically switches between reference inversion mode and modified inversion mode based on pattern detection. For frames containing vulnerable patterns like white text on black background, the system transitions to modified inversion mode which prevents flickering. For other frames, it maintains reference inversion mode to preserve image quality, creating an adaptive solution that responds to content characteristics.
Solution Approach 2:
The patent applies different inversion modes to different types of content locally. Instead of using a single inversion mode for all content, the system identifies vulnerable patterns and applies modified inversion mode specifically to those cases, while using reference inversion mode for other content. This localized approach ensures optimal performance for each pattern type.
3Object-affected harmful factors
If modified inversion mode is used for all frames, then screen flickering for specific patterns is prevented, but image quality deteriorates for other content
Solution Approach 1:
The system dynamically selects the appropriate inversion mode based on the current frame's pattern characteristics. Modified inversion mode is applied only when vulnerable patterns are detected, while reference inversion mode is used for other content to maintain image quality. This dynamic selection prevents unnecessary image quality deterioration while still providing flickering prevention when needed.
Solution Approach 2:
The inversion mode parameter is changed conditionally based on pattern detection results. The system monitors content characteristics and adjusts the inversion mode parameter accordingly, using modified inversion mode only when vulnerable patterns are present and reference inversion mode otherwise, optimizing both flickering prevention and image quality.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a data driver which transmits data voltages to the plurality of pixels, and a signal controller which receives an input image signal and an input control signal to control the data driver, where the signal controller calculates a ratio of a first type of pattern in a image based on the input image signal, generates a polarity signal based on the ratio of the first type of pattern, and transmits the polarity signal to the data driver.