Display Driving Circuit for Real-Time Data Line Short Detection
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Solution Overview
Problem
Existing display devices face challenges in detecting short circuits within the display panel efficiently, which can lead to screen defects and potential damage due to heat generation, and current methods are slow in identifying such defects.
Innovation Solution
A display device with a timing controller, data driver, and defect detection circuit that applies measurement reference voltages to data lines and compares input voltages to detect defects in real time, generating a shutdown signal based on the comparison results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional defect detection methods are used, then device complexity is reduced, but defect detection speed is slow
Solution Approach 1:
The display panel is divided into multiple scan regions, and defect detection is performed separately for each region using different measurement reference voltages. This segmentation allows parallel processing of defect detection across multiple regions, significantly improving detection speed without requiring a complete system redesign.
Solution Approach 2:
Measurement reference voltages are applied to data lines before actual display operation to proactively detect potential defects. By performing defect detection in advance during initialization or idle periods, the system can identify issues before they cause screen defects or heat damage, enabling timely shutdown without interfering with normal display performance.
2Measurement precision
If multiple measurement reference voltages are applied to different scan regions, then defect detection precision is improved, but use of energy increases
Solution Approach 1:
Different measurement reference voltages are applied to different scan regions based on their specific characteristics and defect risks. This localized approach allows the system to achieve high detection precision in each region while avoiding the energy waste of applying high voltages uniformly across the entire display panel. Each region receives the appropriate voltage level needed for effective defect detection.
Solution Approach 2:
Defect detection using multiple measurement reference voltages is performed periodically rather than continuously. The system switches between different voltage levels in a periodic manner during initialization or idle periods, enabling comprehensive defect detection across all regions while minimizing overall energy consumption by limiting high-voltage application to necessary time windows.
3Reliability
If real-time defect detection is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The defect detection circuit is integrated into the existing display driving circuitry, allowing the same hardware to serve dual purposes: normal display operation and defect detection. By making the detection circuit multi-functional rather than adding separate dedicated detection hardware, the system achieves real-time monitoring capability while minimizing the increase in overall device complexity.
Solution Approach 2:
The display driving circuit performs self-diagnosis by monitoring its own operation parameters and comparing them against expected values. The circuit uses its existing resources to detect defects in the display panel without requiring extensive external monitoring equipment, thereby improving reliability while keeping the added complexity minimal and contained within the driving circuit itself.
Data Source
AI summary
A display device includes a pixel array including a plurality of pixels connected to a plurality of data lines; a timing controller which generates a reference voltage; and a data driver including a first sense amplifier which outputs a first measurement reference voltage corresponding to a first data line among the plurality of data lines, a second sense amplifier that outputs a second measurement reference voltage that is lower than the first measurement reference voltage in response to a second data line disposed next to the first data line, and a defect detection circuit which is connected to the second sense amplifier and generates a shutdown signal based on a comparison result between the input voltage received from the second sense amplifier and the reference voltage.