Display Driving Device Error Detection via Parasitic Capacitance
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Solution Overview
Problem
Display panels face issues with durability against external impacts, leading to potential short circuits, overcurrents, and overheating, which can affect image quality and safety, necessitating effective error detection mechanisms.
Innovation Solution
A display driving device with a panel test unit and switching unit that determines errors in gate and data lines by using parasitic capacitors, allowing selective connection to either the data driver or panel test unit, enabling error detection without additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display panel durability is improved to resist external impacts, then reliability is improved, but detection of errors such as short circuits and open phenomena becomes more critical and complex
Solution Approach 1:
The patent applies preliminary action by performing panel error detection before the display panel is fully assembled into the display device. The test signal is applied to the gate line and data line while the panel is still accessible, allowing early detection of cracks, scratches, short circuits, or open phenomena. This early detection prevents defective panels from being assembled, reducing future detection complexity and improving overall reliability.
Solution Approach 2:
The patent uses an intermediary approach by introducing a test signal as a mediator to detect panel errors. The test signal is applied through the gate line and data line to elicit a response from the pixel, which is then measured to determine panel health. This intermediary test signal allows indirect detection of physical damage without requiring direct inspection of the panel structure.
2Reliability
If error detection capability is enhanced to detect short circuits and open phenomena, then reliability is improved, but device complexity increases due to additional detection circuits
Solution Approach 1:
The patent applies universality by designing the gate driver to perform multiple functions: it serves as both the normal driving circuit for displaying images and as the test signal application circuit for error detection. The same gate driver outputs both image signals during normal operation and test signals during detection mode. This multi-functionality eliminates the need for separate dedicated test circuits, reducing device complexity while maintaining enhanced error detection capability.
Solution Approach 2:
The patent merges the test signal application function with the existing gate driver circuit. Instead of adding separate test circuits, the invention combines the error detection functionality into the gate driver's existing structure. The gate driver is controlled to output test signals that traverse the gate line and data line to the pixel, merging diagnostic capabilities with the display driving function in a single integrated circuit.
3Measurement precision
If selective connection between data driver and panel test unit is implemented, then error detection accuracy is improved, but switching control complexity increases
Solution Approach 1:
The patent applies periodic action by implementing a switching mechanism that alternates between normal display mode and test detection mode. The switching unit periodically connects the gate driver to either the display panel for normal operation or to the measurement unit for error detection. This periodic switching is controlled by mode signals, creating a rhythmic alternation between functional states that simplifies control logic compared to simultaneous multi-function operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Efficient detection of errors in display panels reduces the risk of short circuits and overheating, enhancing safety and image quality by providing timely information on faulty lines, thereby reducing costs and improving reliability.
Implementation Method 1
determines errors of the gate line and the data line, and determines the occurrence or not of an error of the gate line or the data line
Data Source
AI summary
A display driving device for driving a display panel, including a gate line, a data line intersecting with the gate line, and a pixel defined by the gate line and the data line, includes a data driver inputting an image signal to the pixel through the data line, a panel test unit determining the occurrence or not of an error of the gate line or the data line, and a switching unit selectively connecting the data driver or the panel test unit to the display panel.