Flat Display Panel Defect Compensation via Electrical Modulation
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Solution Overview
Problem
Conventional flat panel display devices suffer from panel defects such as mura, which result in low production yield and deteriorated picture quality due to brightness and chromaticity differences, and existing methods only partially address these issues through improved process technologies.
Innovation Solution
A method and apparatus for controlling picture quality in flat panel displays by storing and applying compensation data to modulate brightness and color in defect areas and their boundaries, using first and second inspection processes to optimize data modulation for each gray scale level and location, thereby compensating panel defects electrically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If process technology is improved to minimize panel defects, then manufacturing precision is improved, but panel defects cannot be completely removed and production yield remains limited
Solution Approach 1:
The patent replaces mechanical/process-based defect prevention with an electrical compensation system. A compensation data generation unit creates electrical compensation data that is stored in memory and applied to defect areas through a compensation data application unit, substituting physical process improvements with electrical signal processing to eliminate panel defects.
Solution Approach 2:
The patent changes the electrical parameters (voltage, data signals) applied to defective areas of the display panel. By modifying the electrical compensation data based on detected defect characteristics, the system adjusts brightness and color parameters in defect regions to match non-defect areas, thereby eliminating the visual impact of panel defects without changing the physical manufacturing process.
2Manufacturing precision
If process technology is improved to minimize panel defects, then manufacturing precision is improved, but picture quality deteriorates due to remaining defects
Solution Approach 1:
The patent replaces process-based quality assurance with electrical compensation. Instead of relying solely on manufacturing precision, the system uses a detection unit to identify defects and a compensation data generation unit to create electrical signals that counteract the visual effects of defects, thereby maintaining picture quality despite manufacturing limitations.
Solution Approach 2:
The patent introduces compensation data as an intermediary element between the display panel and the viewer. This compensation data acts as a mediator that corrects the optical output in defect areas, allowing the panel to display uniform picture quality even when physical defects exist in the manufacturing process.
3Reliability
If compensation data is applied to panel defect areas, then picture quality is improved, but device complexity increases due to additional inspection and modulation processes
Solution Approach 1:
The patent merges the defect detection, compensation data generation, and compensation data application functions into an integrated system. The detection unit, compensation data generation unit, memory unit, and application unit work together as a unified compensation mechanism, reducing operational complexity despite the added functionality.
Solution Approach 2:
The system performs self-diagnosis and self-correction by automatically detecting panel defects and generating appropriate compensation data without external intervention. The compensation data generation unit autonomously creates correction signals based on defect characteristics, and the application unit automatically applies them to the display panel.
4Manufacturing precision
If multiple inspection processes are used to generate compensation data, then manufacturing precision is improved, but loss of time increases during inspection and data generation
Solution Approach 1:
The patent performs preliminary defect detection and compensation data generation during the manufacturing process before the display panel is shipped. By conducting inspection and creating compensation data in advance, the system eliminates the need for time-consuming post-shipping adjustments or returns, and the compensation data is stored in memory for immediate application upon activation.
Data Source
AI summary
A method of controlling a picture quality of a flat panel display device includes storing a first compensation data used to compensate a panel defect area of a display panel, wherein the first compensation data is judged by a first inspection process, storing a second compensation data used to compensate a boundary between the panel defect area and a non-defect area of the display panel, wherein the second compensation data is judged by a second inspection process; a first compensation step to modulate data using the first compensation data stored in a memory, wherein first modulated data are supplied to the panel defect area; a second compensation step to modulate data using the second compensation data stored in the memory, wherein second modulated data are supplied to the boundary of the panel defect area and the non-defect area; and displaying the second modulated data on the display panel.