Flat Panel Display Dither Pattern Boundary Control
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Solution Overview
Problem
Flat panel displays experience issues with periodic noise and FRC flicker due to the repetition of small-sized dither patterns with uniform compensation values, leading to brightness variations and data bunching phenomena at boundaries between dither patterns with different compensation values.
Innovation Solution
An apparatus and method that increase the periodicity of dither patterns by using larger dither patterns (e.g., 8x32 pixels) with sub-dither patterns having the same compensation value but different pixel positions, arranged to vary across frame periods through frame rolling, to prevent boundary appearance and suppress FRC flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small-sized dither patterns with uniform compensation values are used, then the dithering process is simple and efficient, but periodic noise and FRC flicker occur due to pattern repetition boundaries
Solution Approach 1:
The patent divides the dither pattern into multiple sub-dither patterns with different compensation values. Each sub-dither pattern is applied to a specific region, and the combination of these segmented patterns creates a larger effective dither pattern that avoids repetitive boundaries while maintaining dithering efficiency.
Solution Approach 2:
The patent transitions from using uniform compensation values across the entire dither pattern to varying compensation values across different regions. This dimensional change in compensation value distribution allows the pattern to adapt to local brightness requirements while preventing periodic noise through increased pattern diversity.
2Device complexity
If the same dither pattern is repeated during several frame periods, then the implementation is simple, but brightness variation between dither patterns increases and periodic noise appears
Solution Approach 1:
The patent makes the dither pattern dynamic by varying the compensation values across different sub-dither patterns and frame periods. Instead of repeating the same static pattern, the system dynamically adjusts which sub-dither pattern is applied where, preventing brightness variations while maintaining implementation simplicity through automated pattern selection.
Solution Approach 2:
The patent applies different compensation values to different regions of the dither pattern based on local brightness requirements. Each sub-dither pattern is optimized for its specific region, allowing localized brightness compensation while the overall pattern structure prevents periodic noise through spatial diversity.
3Manufacturing precision
If dither patterns with different compensation values are used to compensate for panel defects, then brightness compensation is improved, but boundaries between patterns become visible
Solution Approach 1:
The patent merges multiple sub-dither patterns with different compensation values into a unified dither pattern structure. By combining these patterns in a way that transitions smoothly between regions, the system achieves precise brightness compensation while the merged structure eliminates visible boundaries through seamless pattern integration.
Solution Approach 2:
The patent uses asymmetric arrangement of sub-dither patterns with different compensation values. Rather than symmetric repetition that creates visible boundaries, the asymmetric placement of patterns with varying compensation creates natural transitions that hide boundaries while maintaining compensation precision.
Data Source
AI summary
An apparatus and method for controlling picture quality of a flat panel display. The apparatus for controlling picture quality of the flat panel display includes a position determining unit which determines a display position of digital video data; a gray-level determining unit which determines a gray-level value of the digital video data; and a frame rate control unit that disperses a plurality of dither patterns determined by a compensation value for compensating for brightness in a boundary between the panel defect region and the non-defect region during a plurality of frame periods and controls data, which will be displayed in the boundary, by the compensation value, if the digital video data is determined to the data which will be displayed in the boundary between the panel defect region and the non-defect region according to the determined result of the position determining unit.