Organic Semiconductor Humidity Sensor for Display Stability
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Solution Overview
Problem
Organic semiconductors used in display apparatuses are susceptible to degradation from environmental factors like light, oxygen, and temperature, leading to changes in electric characteristics, which existing sealing methods attempt to mitigate but increase production costs, and without adequate sealing, degradation issues are not properly addressed.
Innovation Solution
Incorporating a humidity sensor with a second organic semiconductor layer on the substrate outside the display area, correlated in electric characteristics with the first semiconductor layer, to determine ambient humidity and adjust the switching element's operation, allowing for stable image display without the need for a sealing structure or with a simple sealing structure, thus reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing structures are provided to organic semiconductors to prevent degradation, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a feedback mechanism by providing a humidity sensor that continuously monitors the ambient environment and feeds this information to a control unit. The control unit then adjusts the driving conditions of the switching element based on the monitored humidity level, creating a closed-loop system that adapts to environmental changes without requiring complex sealing structures.
Solution Approach 2:
The patent changes the operating parameters of the switching element dynamically based on environmental conditions. Specifically, the control unit adjusts the driving voltage or current of the organic semiconductor transistor according to the humidity level detected by the sensor, thereby compensating for degradation effects through parameter modulation rather than physical protection.
2Ease of manufacture
If no sealing structure is provided to reduce cost, then manufacturing cost decreases, but reliability deteriorates due to degradation
Solution Approach 1:
The humidity sensor provides continuous feedback about environmental conditions to the control unit, enabling real-time monitoring and adjustment of the organic semiconductor's operating parameters without physical sealing.
Solution Approach 2:
The system performs self-adjustment by automatically modifying the driving conditions of the switching element based on environmental feedback, eliminating the need for external sealing structures while maintaining performance stability.
3Ease of manufacture
If simple sealing structure is provided to reduce cost, then manufacturing cost decreases, but measurement precision of environmental impact deteriorates
Solution Approach 1:
The patent creates a reference copy of the organic semiconductor structure in the form of a humidity sensor that mimics the electrical characteristics of the switching element. This reference device experiences the same environmental conditions and serves as a benchmark for measuring degradation, enabling precise determination of environmental impact without complex sealing.
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 approach enables the production of display apparatuses at a lower cost while maintaining stable image display even with ambient environment changes, by accurately determining and addressing the degradation of organic semiconductors through correlated electric characteristic monitoring.
Implementation Method 1
a humidity sensor provided on the substrate and outside the display area, the humidity sensor including, as a humidity sensitive layer, a second semiconductor layer formed of a second organic semiconductor having a correlation in terms of electric characteristics with the first organic semiconductor
Data Source
AI summary
A display apparatus includes a substrate; a display area including a plurality of pixels provided on the substrate; a switching element provided for each of the pixels, the switching element including a first semiconductor layer formed of a first organic semiconductor; and a humidity sensor provided on the substrate and outside the display area. The humidity sensor includes, as a humidity sensitive layer, a second semiconductor layer formed of a second organic semiconductor having a correlation in terms of electric characteristics with the first organic semiconductor.