OLED Display Voltage-Line Fault Detection for Short-Circuit Protection
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Solution Overview
Problem
Existing display apparatuses face issues with short circuits in driving voltage lines due to cracks or overheating, leading to overcurrents that can cause the display panel to burn and generate excessive heat.
Innovation Solution
A display apparatus with a defect detection circuit that senses voltage at a base voltage node, outputs a defect signal to control circuits, and blocks current flow in the driving voltage line when a short circuit is detected, thereby preventing further damage and simplifying components for blocking the voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving voltage line is used to supply voltage to sub-pixels, then the display panel can be driven, but a short circuit may occur causing overcurrent and burnout
Solution Approach 1:
The patent applies preliminary action by implementing a defect detection circuit that proactively monitors the driving voltage line for short circuits before they cause damage. The circuit detects defects in advance and generates a defect signal to block the voltage line, preventing overcurrent and burnout before they occur.
Solution Approach 2:
The patent uses an intermediary approach by introducing a defect detection circuit as a mediator between the driving voltage line and the sub-pixels. This intermediary circuit monitors the voltage line and controls the switching transistor to block current flow when a short circuit is detected, protecting the system from harmful overcurrent.
2Reliability
If a blocking component is added to prevent short circuits, then reliability improves, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the defect detection circuit to perform multiple functions: it monitors the driving voltage line for short circuits, generates defect signals, and controls the switching transistor to block current. This multi-functional approach provides comprehensive protection without requiring separate dedicated blocking components.
Solution Approach 2:
The patent implements self-service by enabling the defect detection circuit to automatically detect short circuits and trigger the blocking mechanism without external intervention. The circuit monitors itself and the voltage line, and autonomously activates the switching transistor to block current when a defect is detected, eliminating the need for additional control systems.
3Reliability
If overcurrent flows through the driving voltage line, then short circuit protection is compromised, but heat generation increases
Solution Approach 1:
The patent converts the potentially harmful overcurrent condition into a beneficial protective action. When the defect detection circuit detects a short circuit that would cause overcurrent, it immediately triggers the switching transistor to block the voltage line. This transforms the harmful scenario into an opportunity to activate protection, preventing both short circuit damage and excessive heat generation.
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
The solution effectively prevents short circuits and reduces heat generation in the control printed circuit board, enhancing the reliability and safety of the display apparatus.
Implementation Method 1
a defect detection circuit configured to determine whether a defect occurs in the driving voltage line based on a voltage sensed at the base voltage node
Data Source
AI summary
The present disclosure relates to a display apparatus, and the display apparatus includes a display panel on which a plurality of sub-pixels are disposed, the plurality of sub-pixels each including an organic light-emitting diode, a base voltage node connected to a cathode electrode of the organic light-emitting diode, a plurality of driving voltage lines disposed on the display panel and configured to supply a driving voltage of the organic light-emitting diode to the plurality of sub-pixels, a controller configured to control a gate driving circuit and a data driving circuit, and a defect detection circuit configured to determine whether a defect occurs in the driving voltage line based on a voltage sensed at the base voltage node, wherein, based on a defect signal output from the defect detection circuit, an output of at least one of the controller, the gate driving circuit, and the data driving circuit is controlled.