OLED Display Impedance Sensing for Damage Detection
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Solution Overview
Problem
Organic light emitting display devices are prone to damage from external forces, leading to increased impedance and potential fire risks due to unchecked heat generation, as they lack the ability to sense damage or heat generation.
Innovation Solution
An organic light emitting display device with a substrate, an elasticized sensing film, and a sensing portion that supplies a driving signal to conductive patterns to detect impedance changes, allowing for the sensing of heat and damage through impedance variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the organic light emitting display device is thinned to reduce weight and improve portability, then the device becomes lighter and more portable, but the structural strength decreases making the device more susceptible to damage from external forces
Solution Approach 1:
The patent incorporates a sensing film and sensing portion before damage occurs, enabling the device to detect potential damage early through impedance changes. This preliminary detection mechanism allows the system to take preventive action before the weakened structure fails under external force.
Solution Approach 2:
The sensing film provides continuous feedback on the structural integrity of the thinned device by monitoring impedance variations. When damage is detected, the system can respond by adjusting current supply or triggering safety mechanisms, creating a closed-loop control system that compensates for the reduced structural strength.
2Ease of operation
If the device supplies the same current to the organic light emitting element regardless of increased impedance, then the driving operation is simple and continuous, but heat generation increases proportionally to impedance causing fire risk
Solution Approach 1:
The sensing portion continuously monitors impedance changes in the organic light emitting element and provides feedback to the current control system. When impedance increases indicating damage, the system adjusts current supply accordingly, preventing excessive heat generation while maintaining simple automated operation.
Solution Approach 2:
The patent replaces complex mechanical or manual monitoring systems with an electrical sensing mechanism that uses impedance measurement to detect damage. This electrical substitution enables automatic detection and response to heat generation risks without adding mechanical complexity to the driving operation.
3Device complexity
If the device lacks damage sensing capability, then the device structure is simple, but the device cannot detect damage leading to unchecked heat generation and potential fire
Solution Approach 1:
The sensing film serves multiple functions: it acts as both a structural component of the display device and a damage sensing mechanism. By using the existing conductive patterns and film structure for dual purposes, the patent adds damage detection capability without proportionally increasing device complexity.
Solution Approach 2:
The sensing film utilizes the device's own electrical characteristics (impedance) to detect damage, rather than requiring entirely separate sensing systems. The conductive patterns within the film serve both their original function and as sensing elements, enabling the device to self-diagnose damage through its inherent electrical properties.
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
Enables the prevention of damage and heat-related issues by accurately sensing impedance changes, thereby reducing the risk of fire and ensuring the safety and reliability of the organic light emitting display device.
Implementation Method 1
a sensing film which is elasticized by heat generated from the substrate and in which at least one conductive pattern having impedance is positioned
Data Source
AI summary
An organic light emitting display device is provided. The organic light emitting display device includes a conductive pattern of which impedance varies due to damage or heat generation of a panel and senses the damage or heat generation of the panel by using the conductive pattern.