OLED Sub-pixel Luminosity Correction via Temperature Feedback
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Solution Overview
Problem
Organic light emitting diodes (OLEDs) in displays experience luminosity degradation over time due to temperature exposure, leading to inconsistent image reproduction across sub-pixels.
Innovation Solution
Implementing temperature sensors integrated into or communicatively coupled with OLED sub-pixels, which provide temperature readings to a controller that adjusts the voltage applied to each sub-pixel based on historical luminosity and temperature data to maintain target luminosity values, ensuring consistent image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If OLED sub-pixels operate continuously, then image reproduction is maintained, but luminosity degradation occurs due to temperature exposure
Solution Approach 1:
The system continuously monitors the temperature of each OLED sub-pixel using integrated temperature sensors and uses this feedback to dynamically adjust the drive voltage through a lookup table, compensating for temperature-induced luminosity degradation and maintaining consistent image quality over time
Solution Approach 2:
The patent changes the electrical parameter (drive voltage) of the OLED sub-pixels based on temperature measurements. By adjusting the voltage according to temperature conditions stored in a lookup table, the system compensates for luminosity degradation without requiring physical replacement of the OLED components
2Reliability
If temperature-based correction is implemented, then luminosity consistency is improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The patent divides the OLED display into individual sub-pixel units, each with its own temperature sensor and correction mechanism. This segmentation allows for localized temperature compensation without requiring system-wide overheating management, reducing overall control complexity while maintaining image consistency
Solution Approach 2:
The patent introduces temperature sensors as intermediary components that mediate between the OLED sub-pixels and the control system. These sensors provide temperature data that is processed through a lookup table to determine appropriate voltage adjustments, simplifying the control logic while achieving reliable luminosity correction
3Illumination intensity
If voltage is increased to compensate for luminosity degradation, then brightness is maintained, but energy consumption increases
Solution Approach 1:
The patent applies partial voltage compensation rather than maximizing voltage increase. By using temperature-based lookup tables to determine precise voltage adjustments, the system applies only the necessary amount of additional voltage to maintain luminosity, avoiding excessive energy consumption while still achieving the desired brightness level
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 effectively corrects OLED sub-pixel luminosity by dynamically adjusting voltage in response to temperature changes, thereby maintaining image fidelity and extending the lifespan of OLEDs in display devices.
Implementation Method 1
Implementing temperature sensors integrated into or communicatively coupled with OLED sub-pixels, which provide temperature readings to a controller
Implementation Method 2
Organic light emitting diodes (OLEDs) are often used as individually controlled light elements in display assemblies
Data Source
AI summary
In an example implementation according to aspects of the present disclosure, a system including a controller to receive a temperature value, from a temperature sensor corresponding to a sub-pixel in an organic light emitting display. The controller calculates a luminous value of the sub-pixel based on the temperature value and a function corresponding to a degradation of luminosity over time and temperature. The controller determines, based on the luminous value, a corrected luminous value corresponding to a target luminous value. The controller retrieves a voltage value from a second database, wherein the second database comprises a luminous-voltage relationship. The controller applies the voltage value to the sub-pixel.