Data Driver Switch Network for Precise Display Defect Inspection
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Solution Overview
Problem
Existing display devices face challenges in accurately inspecting for electrical defects in data drivers due to electrostatic discharge, which can lead to bonding defects and affect the performance of components like the driving chip and flexible circuit board.
Innovation Solution
A display device design that includes a data driver with dummy source amplifiers and switches, allowing for the detection of electrical defects by controlling data signal transmission through a switching component, enabling accurate defect identification without requiring module replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional defect inspection methods are used, then inspection simplicity is maintained, but measurement precision and reliability of defect detection deteriorate
Solution Approach 1:
The data driver is segmented into multiple independent source amplifiers (first source amplifier, second source amplifier, third source amplifier) each responsible for specific data lines. This segmentation allows isolated testing of each amplifier's functionality by controlling switches to connect or disconnect specific amplifiers to specific data lines, enabling precise defect detection without requiring complete system replacement.
Solution Approach 2:
Switches are introduced as intermediary components between source amplifiers and data lines. These switches act as mediators that can be controlled to connect or disconnect specific amplifiers to specific data lines during inspection. The switches enable the inspection system to route signals and isolate defective components without requiring physical replacement of the entire data driver module.
2Reliability
If module replacement is performed for defect inspection, then reliability is improved, but productivity and manufacturing cost deteriorate
Solution Approach 1:
The data driver incorporates self-diagnostic capabilities through integrated switches and dummy load circuits that enable it to inspect itself without external test equipment or module replacement. The inspection system uses the data driver's own components (source amplifiers, switches, and dummy loads) to test the functionality of each amplifier, allowing the system to detect and report defects while remaining operational.
Solution Approach 2:
Instead of discarding the entire data driver module when a defect is detected, the inspection system identifies and isolates only the defective amplifier using the switch network. The defective amplifier can be selectively disconnected from the data lines while other amplifiers continue to function. This approach recovers the operational functionality of the data driver by excluding only the faulty component rather than replacing the entire module.
3Difficulty of detecting and measuring
If dummy source amplifiers and switches are added, then defect detection capability is improved, but device complexity increases
Solution Approach 1:
The inspection functionality is merged with the normal operational circuitry of the data driver. The dummy source amplifiers are integrated alongside the actual source amplifiers, and the switches are incorporated into the existing signal path between amplifiers and data lines. This merging allows the inspection system to share physical space and circuit resources with the operational mode, reducing the additional complexity burden.
Solution Approach 2:
The source amplifiers and switches serve dual functions: they operate in normal mode to drive data lines during display operation, and in inspection mode to enable defect detection through controlled connection and disconnection. The dummy source amplifiers and switches are configured to perform both as part of the inspection pathway and as functional components during normal operation. This multi-functionality justifies the added complexity by providing both operational capability and self-diagnostic ability through the same structural elements.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels connected to m data lines (where m is a positive integer greater than or equal to 3), and a data driver configured to supply a plurality of data signals to the m data lines. The data driver includes an output component and a switching component. The output component includes m source amplifiers respectively connected to the m data lines, and a first dummy source amplifier connected to a first dummy data line. The switching component includes m switches respectively formed on the m data lines, m−1 forward switches formed between adjacent data lines among the m data lines, m−1 reverse switches formed between the adjacent data lines, and a first dummy switch formed on the first dummy data line.