Display Device With Integrated Moisture Sensing Parts
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Solution Overview
Problem
Existing display devices suffer from corrosion of electrodes and deterioration of organic light emitting layers due to moisture or hydrogen permeation, leading to defects and poor performance.
Innovation Solution
A display apparatus with a substrate containing a display area and a non-display area, featuring thin film transistors, light emitting diodes, and water sensing parts in the non-display area that detect moisture penetration by measuring changes in current, allowing for accurate location and amount detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture permeation is not detected, then display devices can be manufactured and used, but electrodes become corroded and organic light emitting layer deteriorates
Solution Approach 1:
The water sensing part is integrated into the display device structure during manufacturing, enabling preliminary detection of moisture permeation before it causes damage to electrodes or organic light emitting layers. This allows early warning and preventive measures to be taken.
Solution Approach 2:
The water sensing part acts as an intermediary component between the external environment and the sensitive internal components (electrodes and organic light emitting layer). It detects moisture permeation through its own material properties without directly contacting or damaging the sensitive components.
2Measurement precision
If water sensing parts are added to detect moisture, then moisture permeation can be detected, but device complexity increases
Solution Approach 1:
The water sensing part is merged with the existing display device structure, utilizing the same substrate and encapsulation layer framework. This integration approach enables moisture detection functionality without requiring a completely separate detection system, thereby limiting the increase in device complexity.
3Reliability
If all display devices are replaced due to moisture permeation, then defective devices are eliminated, but manufacturing waste increases
Solution Approach 1:
The water sensing part provides real-time feedback on moisture permeation status, enabling differentiated treatment of display devices. Instead of replacing all devices, only those showing signs of moisture permeation can be identified and replaced, while devices with intact sealing can continue to be used.
Solution Approach 2:
The feedback mechanism from water sensing parts enables selective discarding of only the defective devices showing moisture permeation, while recovering and continuing to use non-defective devices. This approach minimizes manufacturing waste by avoiding unnecessary replacement of functional devices.
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 quick and accurate detection of moisture permeation, reducing the number of defective devices by identifying only those affected, thus minimizing waste.
Implementation Method 1
an amount of current in the water sensing part changes according to a change in an amount of moisture penetrating
Data Source
AI summary
A display apparatus includes a substrate including a display area including a plurality of sub-pixels and a non-display area outside the display area. The display apparatus includes a thin film transistor and a light emitting diode disposed in each sub-pixel of the display area. The display apparatus includes an encapsulation layer sealing the light emitting diode. The display apparatus includes a plurality of water sensing parts disposed in the non-display area and detecting moisture penetrating. An amount of current in the water sensing part changes according to a change in an amount of moisture penetrating.