Flat Panel Display Defect Compensation via Data Modulation
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Solution Overview
Problem
Flat panel displays, such as LCDs, often suffer from display defects like vertical and horizontal line defects due to variations in exposure light during the photolithography process, which cannot be effectively prevented by conventional methods, and require specific brightness compensation for different defect forms.
Innovation Solution
A method and apparatus that read identification information from the display panel to generate positional and form information of defects, calculate compensation values, store these in memory, and modulate data to be displayed at the defect positions, using a compensation unit to adjust the data and improve picture quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photolithography process is used for manufacturing display panels, then mass productivity and manufacturing efficiency are improved, but display defects such as vertical and horizontal line defects appear due to variation in exposure light amount
Solution Approach 1:
The patent applies preliminary action by measuring and identifying display defects during the manufacturing process, then storing compensation data before the product reaches the consumer. The compensation values are pre-calculated and stored in memory, allowing the display device to automatically correct defects without requiring manual intervention or recall of defective products.
Solution Approach 2:
The patent changes the electrical parameters (voltage or gamma correction values) of pixels in defect areas to compensate for manufacturing variations. By adjusting these electrical parameters, the display device can correct brightness and color uniformity issues caused by photolithography variations, effectively transforming a manufacturing precision problem into an electrical parameter adjustment problem.
2Ease of manufacture
If conventional display manufacturing methods are used, then manufacturing simplicity is maintained, but display defects cannot be effectively prevented or compensated
Solution Approach 1:
The patent implements feedback by measuring the actual display characteristics during manufacturing, comparing them against target values, and storing compensation data that reflects the specific defects of each panel. This feedback mechanism allows each display panel to be individually characterized and corrected, ensuring high reliability without complicating the manufacturing process.
Solution Approach 2:
The patent enables self-service by allowing the display device to automatically compensate for its own defects using stored compensation data. The display controller reads the compensation values from memory and applies them in real-time during operation, eliminating the need for external calibration or manual adjustment by the user.
3Device complexity
If display defects are left uncorrected, then device complexity is minimized, but picture quality and user satisfaction deteriorate
Solution Approach 1:
The patent merges the defect compensation function with the existing display control system by integrating the compensation data storage in the display memory and the compensation application in the display controller. This merging approach allows defect correction without adding separate complex subsystems, maintaining device simplicity while improving brightness uniformity and overall picture quality.
Data Source
AI summary
A method and apparatus for controlling picture quality of a flat panel display capable of electrically compensating for a display defect of a display panel are disclosed. The method of compensating for a display defect of a flat panel display includes reading identification information of a display panel; generating positional information indicating the position of the display defect and the form of the display defect of the display panel on the basis of first input information and the identification information; generating a compensation value for compensating the degree of the display defect of on the basis of second input information; storing the positional information and the compensation value in a memory; and reading the positional information and the compensation value from the memory, modulating data to be displayed at the position of the display defect of the display panel by the compensation value, and displaying the modulated data on the display panel.