OLED Assembly Low-Temperature Operation via Dielectric Heating
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Solution Overview
Problem
Conventional optoelectronic assemblies with organic light-emitting components face challenges in operating effectively across a wide temperature range, particularly at low temperatures, due to strong temperature dependence of forward voltage, leading to high costs and inefficiencies when trying to maintain adequate voltage levels.
Innovation Solution
An optoelectronic assembly with a temperature sensor and control device that applies an alternating voltage initially to heat the organic light-emitting component before switching to direct voltage, allowing operation at low forward voltage and power, without additional heating elements or connections, thus reducing costs and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the control device is designed for high voltage to operate the organic light-emitting component at cold temperatures, then the organic light-emitting component can be operated at low temperatures, but the costs increase and the control device requires higher performance
Solution Approach 1:
The patent applies preliminary heating action by using an alternating voltage component to heat the organic light-emitting component before normal operation. The control device heats the OLED using alternating voltage (which does not cause significant current flow) to raise its temperature, then switches to direct voltage for normal operation. This preliminary heating enables the OLED to operate at low ambient temperatures without requiring the control device to be designed for high voltage from the start.
Solution Approach 2:
The patent changes the voltage type parameter from direct voltage to alternating voltage during the heating phase. By using alternating voltage for heating, the control device can operate at lower voltage levels initially, avoiding the need for high-voltage design. The alternating voltage heats the OLED through dielectric heating without causing significant current flow, and then the system switches to direct voltage for normal operation.
2Temperature
If the forward voltage is increased to operate the organic light-emitting component at low temperatures, then the component can be operated across a wide temperature range, but additional insulation effort and costs increase
Solution Approach 1:
The system performs preliminary heating using alternating voltage before switching to direct voltage operation. This preliminary action raises the temperature of the organic light-emitting component, enabling it to operate across a wide temperature range without requiring increased forward voltage or additional insulation measures.
Solution Approach 2:
The patent changes the voltage application mode from continuous direct voltage to alternating voltage during the heating phase. This parameter change enables temperature control without increasing the voltage level, thereby avoiding additional insulation requirements and manufacturing costs.
3Temperature
If additional heating elements or connections are added to heat the organic light-emitting component, then the component can be operated at low temperatures, but the device complexity and costs increase
Solution Approach 1:
The control device performs multiple functions: it uses alternating voltage for heating the organic light-emitting component and then switches to direct voltage for normal operation. This multi-functionality eliminates the need for separate heating elements or additional connections, as the control device itself provides both heating and operating functions.
Solution Approach 2:
The organic light-emitting component heats itself through dielectric heating when alternating voltage is applied. The alternating voltage causes dielectric losses in the OLED materials, generating heat internally without requiring external heating elements. This self-heating mechanism simplifies the overall system structure.
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 cost-effective and efficient operation of organic light-emitting components across a wide temperature range by quickly heating the components with alternating voltage, reducing the need for high-performance control devices and minimizing wear, thereby extending service life.
Implementation Method 1
the control device is set up to apply an alternating voltage to the organic light-emitting component when the organic light-emitting component is switched on, which is at least temporarily smaller than a current threshold voltage of the organic light-emitting component if the detected temperature value is smaller than a predetermined temperature threshold
Data Source
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AI summary
In various exemplary embodiments, an optoelectronic assembly (10) is provided, comprising: an organic light emitting component (1), a temperature sensor (52) for detecting a temperature value; and a control unit (50), which is coupled to the organic light emitting component (1) and the temperature sensor (52) and which is configured, upon the organic light emitting component (1) being switched on, to apply to the organic light emitting component (1) an AC voltage (Uw) which, at least at times, is less than a present threshold voltage (Uth) of the organic light emitting component (1) if the detected temperature value is less than a predefined temperature threshold value, and to apply to the organic light emitting component (1) a DC voltage (Ug) which is greater than the present threshold voltage (Uth) of the organic light emitting component (1) if a measured value is greater than or equal to a predefined threshold value.