Display Device Scan Driver ESD Protection Segmentation
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Solution Overview
Problem
Existing display devices face issues during pixel testing, where changing the power source voltage for the scan driver to test pixels causes erroneous operation of the ESD protection circuit, potentially exposing internal circuits to high voltage pulses due to static charges.
Innovation Solution
A display device with separate AC and DC power source units for scan driving blocks, allowing the power source voltage to be switched between logic high and low levels during testing, and using transistors and capacitors to manage these voltages, ensuring concurrent output of scan signals to prevent erroneous ESD protection circuit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power source voltage level is changed for pixel testing, then pixel test capability is improved, but the ESD protection circuit performs erroneous operation
Solution Approach 1:
The power source voltage wire is divided into two separate wires: one dedicated to supplying power to the scan driver and another dedicated to supplying power to the ESD protection circuit. This segmentation allows independent voltage control for each circuit, enabling pixel testing with variable voltage while maintaining stable ESD protection circuit operation
Solution Approach 2:
Different voltage levels are applied to different parts of the system: the scan driver receives variable voltage levels (logic high or logic low) for testing purposes, while the ESD protection circuit receives a constant logic high voltage to ensure reliable operation. This local quality differentiation resolves the conflict between testing adaptability and circuit reliability
2Productivity
If the power source voltage is changed to concurrently output scan signals, then pixel test detection efficiency is improved, but the ESD protection circuit is exposed to high voltage pulses
Solution Approach 1:
The power supply path is segmented into separate wires for the scan driver and ESD protection circuit. This allows the scan driver to receive voltage changes for concurrent scan signal output while the ESD protection circuit is isolated on a separate wire, preventing exposure to harmful voltage pulses
Solution Approach 2:
The separate power source voltage wire acts as an intermediary that isolates the ESD protection circuit from voltage fluctuations in the scan driver power supply, allowing the scan driver to operate with variable voltages for efficient testing while the ESD protection circuit maintains stable operation
Data Source
AI summary
A display device according to the present invention includes: a display unit including a plurality of pixels coupled to a plurality of scan lines; a plurality of scan driving blocks coupled to the plurality of scan lines and adapted to apply a plurality of scan signals; an electrostatic discharge (ESD) unit adapted to protect the plurality of scan driving blocks from static charges; an AC power source unit for supplying a first power source voltage of which a level is changed between a logic high level and a logic low level, to the plurality of scan driving blocks through a first power source voltage wire during a pixel test of the plurality of pixels; and a DC power source unit for supplying a second power source voltage of the logic high level to the ESD unit through a second power source voltage wire.