Driving Circuit Inspection for Display Anomaly Detection
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Solution Overview
Problem
Existing methods for inspecting liquid crystal panels driven by static driving cannot effectively determine if the panels are properly driven during normal display operations, lacking the ability to detect anomalies in the voltage application paths.
Innovation Solution
A driving circuit with a voltage generation circuit, output terminals, and an inspection circuit that alternates inspection voltages and signals to detect anomalies in the paths from the voltage generation circuits to the electrodes, allowing for inspection during normal operation by switching between different inspection modes to identify short circuits and disconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a static driving inspection method is used where voltage is sequentially applied to segment electrodes, then the inspection process is simple, but the ability to detect anomalies during normal display operation is lost
Solution Approach 1:
The inspection circuit performs anomaly detection in advance during normal display operation by continuously monitoring voltage application paths. The circuit proactively detects potential failures before they manifest as display errors, allowing the system to maintain reliability without interrupting normal operation.
Solution Approach 2:
The inspection circuit operates continuously during normal display operation, simultaneously performing both display functions and anomaly detection. This continuous monitoring ensures that the system maintains its useful action (display operation) while continuously detecting anomalies, resolving the contradiction between operational simplicity and detection capability.
2Measurement precision
If separate inspection circuits are provided for each voltage path, then the detection precision is improved, but the device complexity increases
Solution Approach 1:
A single inspection circuit is designed to universally monitor multiple voltage application paths by selectively connecting to different paths through switching mechanisms. This multi-functional approach allows one circuit to perform the work of multiple dedicated circuits, maintaining detection precision while reducing overall device complexity.
Solution Approach 2:
Multiple inspection functions for different voltage paths are merged into a single integrated inspection circuit. The circuit combines monitoring capabilities for first voltage paths, second voltage paths, and signal paths into one unified structure, achieving comprehensive anomaly detection without the complexity of separate circuits for each path.
3Ease of manufacture
If inspection is performed by visually confirming segment activation, then the inspection method is simple to implement, but the inspection can only be performed when the display is off
Solution Approach 1:
The manual visual inspection method is replaced with an automated electrical inspection circuit that electronically monitors voltage application paths. This substitution eliminates the need to visually confirm segment activation and allows inspection to occur during normal display operation, preventing display interruption and maintaining productivity.
Solution Approach 2:
The inspection system performs self-diagnosis by automatically monitoring its own voltage application paths without requiring external visual inspection. The circuit independently detects anomalies in real-time during normal operation, eliminating the need to stop the display for inspection and maintaining continuous productive operation.
Data Source
AI summary
A common driver 200 includes a voltage output circuit 160 that outputs an inspection voltage that is different between a first period and a second period to an inspection voltage output line Ld, and outputs a first voltage Va1 to a first segment electrode and a second voltage Va2 to a second segment electrode SE2 in the first period and the second period, a signal output circuit 140 that outputs, to a signal voltage output line Ls, a voltage of a first signal in the first period, and a voltage of a second signal in the second period, and an inspection circuit 170 that inspects whether or not an anomaly is present based on the voltage of the inspection voltage output line Ld and the voltage of the signal voltage output line Ls.