Flat Display Panel Defect Compensation via Dithering
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Solution Overview
Problem
Flat panel display devices suffer from panel defects such as brightness disparities and color differences due to manufacturing processes, leading to reduced product reliability and increased costs, as existing methods primarily focus on improving fabrication processes rather than effectively addressing defects during use.
Innovation Solution
A flat panel display device with a memory that stores location information and compensation values for panel defects, using a compensating part to adjust data displayed at defect locations with R, G, and B compensation values, optimized for each defect location and gray level, employing frame rate control and dithering methods to distribute compensation values across frames and pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fabrication process improvements are implemented, then manufacturing precision is improved, but device complexity increases and cannot fully eliminate defects
Solution Approach 1:
The patent replaces mechanical/fabrication-based defect prevention with an electrical compensation system. A compensation value memory stores defect information, and a compensation signal generator creates correction signals that are added to display data, substituting physical manufacturing perfection with electronic defect correction.
Solution Approach 2:
The patent introduces a compensation value memory and compensation signal generator as intermediary components between the display panel and the control system. These intermediaries store defect information and generate correction signals that mediate the display output, allowing defects to be corrected without redesigning the fabrication process.
2Reliability
If panel defects are compensated electrically, then picture quality is improved, but device complexity increases due to additional compensation circuits
Solution Approach 1:
The compensation value memory serves multiple functions: it stores defect location information, defect type data, and compensation values for different gray levels. The compensation signal generator also performs multiple tasks by detecting pixel locations, determining defect types, and generating appropriate compensation signals, thereby reducing overall system complexity through multi-functional components.
Solution Approach 2:
The patent changes the parameter space by storing compensation values for multiple gray levels (0-255) and different defect types in the compensation value memory. The compensation signal generator dynamically adjusts compensation parameters based on the detected pixel location and gray level, allowing flexible defect correction without hardwiring complex circuitry for each defect scenario.
3Manufacturing precision
If compensation values are stored for each defect location and gray level, then manufacturing precision is improved, but memory requirements and device complexity increase
Solution Approach 1:
The compensation value memory stores defect-specific compensation values organized by location and gray level, applying local quality correction only where needed. The compensation signal generator detects the specific pixel location and applies targeted compensation only to affected areas, rather than uniformly processing the entire display panel, thereby reducing unnecessary computational complexity.
Solution Approach 2:
The compensation values for all gray levels and defect types are pre-calculated and stored in the compensation value memory during manufacturing or initialization. This preliminary action allows the compensation signal generator to simply retrieve and apply pre-computed values during operation, avoiding complex real-time calculations and reducing runtime processing complexity.
Data Source
AI summary
A flat panel display device and a picture quality controlling method thereof is provided. The flat panel display device includes a display panel. A memory stores location information about a panel defect location on the display panel and a compensation value to be dispersed for a plurality of frame periods. A compensating part detects the data to be displayed at the panel defect location and adjusts the data to be displayed at the panel defect location with the compensation value from the memory.