Abnormal Coupling Detection in Display Device Power Wiring
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Solution Overview
Problem
Display devices are prone to overheating and potential burnout due to increased contact resistance between cables and circuit boards, leading to overcurrent issues.
Innovation Solution
Incorporating an abnormal coupling detector and voltage supply controller that generate protection signals based on voltage differences between wiring pairs, which trigger a shutdown signal to prevent overvoltage when abnormal coupling is detected, ensuring safe operation by stopping the driving voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable coupling is not monitored, then device complexity is reduced, but reliability deteriorates due to potential overcurrent damage
Solution Approach 1:
The abnormal coupling detector is configured to detect coupling abnormalities before they cause damage. The detector includes detection circuits that continuously monitor cable connections, and the voltage supply controller is pre-programmed to respond to detection signals by shutting down power supply, preventing overcurrent damage before it occurs
Solution Approach 2:
The patent introduces an intermediary detection system between the cable and the display panel. The abnormal coupling detector acts as a mediator that monitors the electrical characteristics of cable connections and communicates with the voltage supply controller to prevent damage without requiring direct intervention in the power supply path
2Reliability
If voltage supply is continuously monitored, then reliability is improved, but use of energy increases due to continuous detection operations
Solution Approach 1:
The detection system operates periodically rather than continuously. The voltage supply controller receives detection signals at specific intervals and processes them accordingly. The detection circuits are activated during specific monitoring periods and can enter low-power states between detections, reducing overall energy consumption while maintaining reliable protection
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
Effectively prevents display panel damage by detecting abnormal coupling and promptly shutting down the power supply, thereby preventing overcurrent and overheating.
Implementation Method 1
a first diode array including first diodes connected in series in a forward direction from the second wiring to the first wiring, and a second diode array including second diodes connected in series in a forward direction from the first wiring to the second wiring
Data Source
AI summary
A display device includes: a display panel including first and second wirings; a control circuit board spaced apart from the display panel and including a power management circuit which provides a driving voltage to the first and second wirings; a first cable coupled to the control circuit board and electrically connecting the power management circuit and the first wiring; a second cable coupled to the control circuit board and electrically connecting the power management circuit and the second wiring; an abnormal coupling detector connected between the first and second wirings and generating first and second protection signals based on a difference between a first voltage of the first wiring and a second voltage of the second wiring; and a voltage supply controller counting the first and second protection signals, and providing a shutdown signal to the power management circuit such that the power management circuit stops providing the driving voltage.