OLED Display Temperature Sensing via Driving Voltage
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Solution Overview
Problem
Conventional organic light emitting display devices face challenges in accurately measuring ambient temperature, which affects their performance and efficiency due to variations in driving voltage with climate conditions.
Innovation Solution
An organic light emitting display device is designed with a temperature sensing unit, power driver, and voltage control unit, allowing it to measure ambient temperature by determining the driving voltage and referencing stored memory values, thereby optimizing performance based on temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate temperature sensing device is used, then temperature measurement accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The organic light emitting component serves dual functions: light emission and temperature sensing. By measuring the driving voltage required to maintain constant current through the component, the system obtains temperature information without adding separate sensing devices, thus resolving the contradiction between measurement accuracy and device complexity
Solution Approach 2:
The organic light emitting component senses temperature through its own electrical characteristics during normal operation. The component effectively monitors its own operating conditions by utilizing changes in its driving voltage under constant current, enabling self-diagnosis and temperature compensation without external intervention
2Reliability
If driving voltage is optimized based on temperature, then display quality and power consumption are improved, but additional measurement and control circuitry is required
Solution Approach 1:
The voltage control unit is integrated with the existing power driver circuitry that drives the organic light emitting component. The same circuitry that provides power also measures the driving voltage and controls the compensation, merging multiple functions into a single integrated unit to minimize additional complexity
Solution Approach 2:
The system implements a feedback loop where the driving voltage of the organic light emitting component is continuously monitored under constant current conditions. This voltage information is fed back to the voltage control unit, which adjusts the driving voltage to compensate for temperature-induced variations, ensuring stable display quality across different temperatures
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 enables efficient ambient temperature measurement and optimization of display characteristics such as brightness uniformity and power consumption, improving overall performance and efficiency.
Implementation Method 1
an organic light emitting component disposed on the substrate and electrically connected to the thin film transistor. The organic light emitting component includes a first electrode, a second electrode, and an intermediate layer disposed between the first electrode and the second electrode
Data Source
AI summary
An organic light emitting display device includes a substrate; a thin film transistor disposed on the substrate; and an organic light emitting component disposed on the substrate and electrically connected to the thin film transistor. The organic light emitting component includes: a first electrode; a second electrode; and an intermediate layer disposed between the first electrode and the second electrode. The organic light emitting display device further includes: a temperature sensing unit disposed on the substrate, the temperature sensing unit being configured to operate differently based on an ambient temperature of the organic light emitting display device; a power driver configured to provide power to the temperature sensing unit; and a voltage control unit configured to: determine a driving voltage of the temperature sensing unit based on the power provided to the temperature sensing unit; and determine the ambient temperature based on the driving voltage.