Display Device Self-Diagnosis for Contact Error Detection
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Solution Overview
Problem
Existing display device inspection methods fail to accurately distinguish between intrinsic defects and contact errors between the display panel and inspection equipment, leading to incorrect determination of defective panels and reduced production yield.
Innovation Solution
A display device with a self-diagnosis function that includes a panel unit, an input unit, and a signal controller with a master and slave configuration to diagnose electrical connections, using distinct waveforms to determine connection errors and display normal or error conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact error between display panel and inspecting equipment occurs, then inspection accuracy deteriorates, but production yield is reduced due to misclassification of non-defective panels
Solution Approach 1:
The inspection system is segmented into multiple independent inspection lines (first inspection line, second inspection line, third inspection line) that can be independently configured and activated. This allows selective inspection of different signal paths without affecting the entire inspection process, enabling accurate detection of contact errors while maintaining production efficiency.
Solution Approach 2:
A test signal is introduced as an intermediary element to diagnose connection status between the display panel and inspecting equipment. The test signal traverses through inspection lines to detect contact errors without interfering with normal production inspection, thereby maintaining both accuracy and productivity.
2Measurement precision
If intrinsic defect and contact error are not distinguished, then defect detection accuracy deteriorates, but root cause analysis becomes difficult
Solution Approach 1:
The inspection system separates defect detection into distinct pathways: one for intrinsic panel defects and another for contact errors. By using separate inspection lines for different signal types (image signals and test signals), the system can accurately identify whether a failure originates from the panel itself or from connection issues.
Solution Approach 2:
The system implements feedback mechanisms where inspection results are analyzed to determine the nature of defects. When contact errors are detected through the inspection lines, the system provides feedback information that helps distinguish these from intrinsic panel defects, preserving defect cause information for further analysis.
3Adaptability or versatility
If self-diagnosis function is added to distinguish contact errors, then inspection capability is improved, but device complexity increases
Solution Approach 1:
The inspection lines serve multiple functions: they can transmit image signals during normal production inspection and simultaneously transmit test signals for contact error diagnosis. This multi-functionality allows the system to perform both standard inspection and self-diagnosis without requiring entirely separate hardware systems.
Solution Approach 2:
The inspection system incorporates self-diagnosis capabilities where the display panel and inspecting equipment can automatically detect and identify contact errors without external intervention. The master and slave devices work together to automatically test connection status, reducing the need for additional diagnostic equipment or manual testing procedures.
Data Source
AI summary
A display device includes a panel unit including a display unit, a first circuit board connected to the display unit, and a first connecting member connected to the first circuit board, an input unit including a connection member configured to attach to the first connecting member, and to provide an image signal to the panel unit, a master configured to output a transmitting signal for diagnosing an electrical connection between the first connecting member and the connection member, a transmitting line connected to the master, an inspecting line configured to connect to the transmitting line through the connection member, and a slave configured to connect to the master through the inspecting line, to receive the transmitting signal as a receiving signal, and to enable determination of on-time duty and off-time duty of the receiving signal to determine whether a connection error between the panel unit and the input unit exists.