Over-Current Control Device for OLED Display Protection
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Solution Overview
Problem
Existing organic light emitting display devices face the challenge of detecting and preventing over-currents, which can lead to device shutdown and potential fires due to the lack of effective over-current detection and interruption mechanisms.
Innovation Solution
An over-current control device is introduced, comprising an over-current identification unit and an interruption unit, utilizing a comparator and a resistor to detect voltage drops and interrupt the power supply if an over-current is detected, thereby preventing damage to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving voltage is applied to the OLED, then the OLED can operate and emit light, but over-current may flow causing device shutdown and fire hazards
Solution Approach 1:
The over-current identification unit performs preliminary detection of over-current conditions before they can cause damage to the OLED. By monitoring the driving voltage and comparing it against reference values, the system identifies potential over-current situations in advance and triggers the interruption unit to prevent harmful current flow, thus resolving the contradiction between enabling OLED operation and preventing over-current damage
Solution Approach 2:
The over-current control device acts as an intermediary between the power supply and the OLED. The identification unit and interruption unit serve as mediating components that monitor electrical parameters and intervene when abnormal conditions are detected, protecting the OLED from direct exposure to harmful over-current while allowing normal operation to proceed
2Reliability
If over-current detection mechanism is added, then safety is improved, but device complexity increases
Solution Approach 1:
The identification unit detects over-current conditions by monitoring changes in electrical parameters, specifically comparing the driving voltage against a reference voltage. This parameter-based detection approach provides effective over-current protection through relatively simple voltage comparison circuits rather than complex current sensing arrangements, thus improving reliability while minimizing the increase in device complexity
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
This solution allows for fast and reliable detection of over-currents outside the display panel, preventing them from entering and causing damage, thus ensuring the safety and reliability of the OLED device.
Implementation Method 1
an over-current identification unit adapted to compare a driving voltage on a supply line for driving the OLED with a reference voltage on a reference voltage line
Data Source
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AI summary
The present invention relates to an over current control device and an organic light emitting display device adopting a function of interrupting an over-current. To provide a over current control device and a OLED device using the same, which allow a fast and reliable detection of an over current, an over current control device for detecting an over current provided to an OLED is provided, comprising: an over-current identification unit (410) adapted to compare a driving voltage (EVDD) on a supply line for driving the OLED with a reference voltage (V_over) on a reference voltage line for identifying the over-current; an interruption unit (420) connected between the supply line supplying the driving voltage (EVDD) and the pixel including the OLED for interrupting the power supply if the over-current identification unit (410) recognizes an over-current flowing through the supply line.