Flat Panel Display Modulation for Brightness Inversion
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Solution Overview
Problem
Flat panel display devices experience brightness inversion phenomena when digital video data is re-modulated in a multi-modulation method, leading to unexpected changes in brightness and contrast, particularly in defect display areas and link sub-pixels.
Innovation Solution
A flat panel display device with a first modulator that adjusts response characteristics and contrast using pre-stored compensation values, and a second modulator that adds or subtracts compensation values to digital video data in defect display areas and link sub-pixels to maintain consistent brightness, integrated with a memory for storing compensation values and location information, and a timing controller for controlling data drive and scan driver circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data are modulated several times with different object values to improve response speed and contrast ratio, then response characteristic and contrast ratio are improved, but brightness inversion phenomenon occurs in defect display areas
Solution Approach 1:
The patent applies different compensation strategies to different display areas. Normal display areas use standard multi-modulation with object values optimized for response speed, while defect display areas use compensated object values that maintain brightness consistency. This local differentiation resolves the contradiction by allowing aggressive modulation where safe and conservative modulation where needed.
Solution Approach 2:
The system performs preliminary identification of defect display areas through inspection data before modulation occurs. Compensation values are pre-calculated and stored for each defect area, allowing the modulation process to apply correct compensation without real-time calculation delays. This preliminary preparation prevents brightness inversion while maintaining response speed improvements.
2Illumination intensity
If second data modulation is applied to improve brightness and contrast in motion picture, then brightness and contrast are improved, but source data change from original video data causing unexpected brightness changes
Solution Approach 1:
The patent introduces compensation values as an intermediary element between the original video data and the modulated output. These compensation values act as a bridge that preserves the relationship to original data while enabling brightness enhancement. The compensation values are calculated based on inspection data and stored object values, serving as a mediator that maintains data integrity traceability.
Solution Approach 2:
The system uses inspection data as feedback to determine appropriate compensation values for each display area. This feedback loop ensures that modulation parameters are continuously optimized based on actual display characteristics, preventing loss of information by adapting to the specific display panel's behavior rather than applying generic transformations.
3Productivity
If multi-modulation method is used to adjust response characteristic and contrast ratio, then display performance is improved, but brightness inversion occurs in defect display areas appearing darker or brighter than normal surface
Solution Approach 1:
The patent implements local quality control by identifying defect display areas through inspection data and applying area-specific compensation values. Each defect area receives tailored compensation based on its characteristics (darker or brighter than normal), while normal areas receive standard optimization. This localized approach maintains manufacturing precision across the entire display surface.
Solution Approach 2:
The system changes modulation parameters dynamically based on display area characteristics. Compensation values stored in memory are selected based on the specific defect type and location, allowing parameter optimization for each area. This parameter adaptation resolves the brightness uniformity issue while maintaining overall display performance improvements from multi-modulation.
Data Source
AI summary
The present invention relates to a flat panel display device that is adaptive for preventing a brightness inversion phenomenon generated when the data modulated before are re-modulated in a multi-modulation method where data are modulated several times, and a data multi-modulation method thereof. The flat panel display device includes a first modulator which primarily modulates digital video data, which are to be displayed in a flat panel display panel, with pre-stored first compensation values in order to adjust at least any one of a response characteristic and a contrast ratio of the flat panel display panel. The flat panel display device further includes a second modulator which secondarily modulates the digital video data, which are to be displayed at a defect display area of which the brightness appears different from that of a normal display surface when displaying the same gray level in the flat panel display panel, with pre-stored second compensation values.