OLED Temperature Detection via Anode Voltage Differences
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Solution Overview
Problem
Display devices, such as light emitting display devices, face challenges in maintaining display quality due to temperature variations, which are not effectively addressed by existing technologies.
Innovation Solution
A light emitting display device that includes a temperature detector connected to the anodes of organic light emitting diodes in sub-pixels, which calculates temperature based on voltage differences and compensates driving signals accordingly, improving measurement accuracy and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature is not measured and compensated, then device complexity is low, but display quality deteriorates due to temperature variations
Solution Approach 1:
The display device measures its own temperature using the organic light emitting diodes already present in the display panel. The OLEDs serve dual purposes: displaying images and functioning as temperature sensors. By detecting voltage differences across OLEDs with different currents, the system self-measures temperature without requiring external temperature sensors, thus improving display quality through temperature compensation while avoiding additional device complexity
Solution Approach 2:
The system continuously monitors temperature by detecting voltage differences across OLEDs and uses this feedback to compensate for temperature variations. The measured temperature information is used to adjust driving parameters, creating a closed-loop control system that maintains display quality despite temperature changes. This feedback mechanism enables the system to adapt to temperature variations dynamically
2Measurement precision
If voltage difference measurement method is used, then measurement precision is improved, but device complexity increases due to additional detection circuits
Solution Approach 1:
The OLEDs in the display panel perform multiple functions: they serve as both display elements and temperature sensors. By utilizing the existing OLED structure and electrical connections, the system achieves temperature measurement capability without requiring separate sensing components. The voltage detection circuits are integrated into the existing display driving architecture, allowing the same hardware to serve dual purposes and avoiding additional device complexity
Solution Approach 2:
The voltage difference across OLEDs serves as an intermediary parameter that correlates with temperature. Instead of directly measuring temperature, the system measures voltage differences which are then converted to temperature values. This indirect measurement approach uses readily available electrical signals from the display operation itself, avoiding the need for complex direct temperature sensing circuits
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
The solution directly measures the temperature of the display panel, compensates for temperature changes, and enhances measurement accuracy, thereby maintaining or improving display quality by removing process deviations and ensuring pure temperature measurement values.
Implementation Method 1
organic light emitting diodes included in at least two sub-pixels positioned in the display panel
Data Source
AI summary
A light emitting display device includes a display panel for displaying an image, a driver for driving the display panel, and a temperature detector connected to anodes of organic light emitting diodes included in at least two sub-pixels positioned in the display panel, wherein the temperature detector detects at least two voltage values from the at least two sub-pixels and calculates a temperature measurement value for measuring a temperature of the display panel based on a difference between the at least two voltage values.