Display Panel Connector Failure Detection via Sensing Voltage
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Solution Overview
Problem
Display devices experience connection failures in connectors, leading to current concentration and heating, which can degrade the display panel, particularly in high current driving voltage applications.
Innovation Solution
A display device with a control printed circuit board that includes a power management integrated circuit and a controller to detect connection failures by comparing sensing data from sub-pixels connected to different connectors, using both driving and sensing voltages to determine discrepancies and output failure detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection cables are used to connect display panel and control printed circuit board, then electrical connection is established, but connection failure may occur leading to current concentration and heating
Solution Approach 1:
The patent implements preliminary detection of connector connection status by measuring voltage at detection terminals before normal operation proceeds. The controller detects connection failures in advance by comparing voltages from different connection cables, enabling early intervention before current concentration and heating can occur.
Solution Approach 2:
The patent establishes a feedback mechanism where the controller continuously monitors voltage differences between detection terminals of different connection cables. When a voltage difference exceeds a threshold, the controller identifies connection failure and can adjust driving voltages or alert the system, creating a closed-loop control system that responds to connection status changes.
2Productivity
If multiple connection cables are used to supply driving voltage, then current distribution is achieved, but connection failure in some cables causes current concentration on remaining cables
Solution Approach 1:
The controller measures voltages at detection terminals of each connection cable and compares them to detect imbalances. When connection failure is detected through voltage comparison, the system can respond by adjusting driving parameters or alerting operators, maintaining current distribution balance despite cable failures.
Solution Approach 2:
The patent introduces detection terminals as intermediary elements that sample voltage from each connection cable independently. These detection terminals act as mediators between the connection cables and the controller, enabling the controller to assess connection status and make informed decisions about current distribution without directly monitoring all cable parameters.
3Ease of manufacture
If connector connection is used for flexibility, then ease of assembly is improved, but connection failure detection becomes more difficult
Solution Approach 1:
The patent introduces detection terminals as intermediary elements that provide accessible voltage sampling points for each connection cable. These terminals make connection status measurable without requiring direct inspection of connector internals, simplifying detection while preserving the modular connector design for easy assembly.
Solution Approach 2:
The patent replaces mechanical inspection methods with electrical measurement for detecting connection failures. By measuring voltage at detection terminals and comparing values electronically, the system substitutes complex mechanical or visual inspection systems with simple electrical measurements, making failure detection easier while maintaining connector flexibility.
Data Source
AI summary
Embodiments relate to a display device including a control printed circuit board on which a power management integrated circuit configured to generate and output a driving voltage is mounted, first and second connection cables connected to the control printed circuit board through a first connector, first and second source printed circuit boards connected to the first and second connection cables, respectively, through a second connector, circuit films on which a source driver integrated circuit is mounted and which are connected to the first and second source printed circuit boards, and a display panel which is connected to the circuit films and on which sub-pixels receiving the driving voltage from the power management integrated circuit through the first or second connection cable are disposed, and a method of driving the same.