Display Panel Defect Compensation Circuit
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Solution Overview
Problem
Flat panel display devices often suffer from picture quality defects such as panel defects, defective pixels, and bright lines due to manufacturing issues, leading to reduced product yield, increased costs, and decreased reliability.
Innovation Solution
A picture quality control system that determines the location of display panel defects, calculates compensation data, and modulates video signals to correct brightness and color information, using a memory and compensation circuit to store and process defect data, and a conductive link pattern to electrically connect defective pixels with adjacent non-defective ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fabrication processes are used to manufacture display panels, then production efficiency is maintained, but panel defects occur leading to reduced yield and increased costs
Solution Approach 1:
The patent applies preliminary action by identifying and marking defective pixels during the fabrication process before final assembly. The inspection system detects defects early and stores location information in a memory device, allowing compensation measures to be prepared in advance without disrupting the main production flow.
Solution Approach 2:
The patent introduces an intermediary compensation circuit that acts as a mediator between the defective pixels and the display output. This circuit reads defect location information from memory and applies compensation signals to adjust the display output, effectively hiding defects without requiring rework of the panel itself.
2Productivity
If defective pixels are left uncorrected to maintain production speed, then manufacturing efficiency is preserved, but picture quality deteriorates reducing product reliability
Solution Approach 1:
The patent extracts the defect compensation function from the main manufacturing process. By separating defect detection, memory storage, and compensation display into independent components, the system allows rapid production while maintaining quality through post-processing compensation rather than requiring slow defect-by-defect correction during assembly.
Solution Approach 2:
The patent implements self-service by enabling the display system to automatically compensate for its own defects through the compensation circuit. The system reads defect information from memory and autonomously adjusts pixel output without requiring external manual intervention or complex real-time inspection systems.
3Reliability
If compensation circuits and memory devices are added to correct defects, then picture quality improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing compensation only at specific defective locations rather than throughout the entire display. The compensation circuit uses stored location information to target only problematic pixels, applying compensation signals selectively rather than uniformly across the display panel.
Solution Approach 2:
The patent reduces complexity by performing defect identification and compensation parameter calculation in advance during fabrication. The memory device stores pre-processed defect location information, allowing the compensation circuit to operate with simple lookup and signal adjustment rather than requiring complex real-time defect analysis.
Data Source
AI summary
A picture quality control system can determine a location of a display panel defect. The system can calculate data used to compensate for the display defect and modulate the compensation data on a video signal to compensate for the defect. The defect may be associated with a pixel or with a display panel area. A picture quality system may include a memory and a compensation circuit. The memory may store compensation data that represents a panel defect location and/or a charge characteristic. The compensation circuit may process the compensation data to increase or decrease brightness information and/or component information of a video signal.