OLED Power Voltage Control via Temperature and Luminance
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Solution Overview
Problem
Conventional organic electroluminescent displays consume unnecessary power due to constant power voltage output regardless of peripheral temperature and luminance level settings, leading to inefficient energy use and potential reduction in display lifespan.
Innovation Solution
An organic electroluminescent display system that includes a DC-DC converter and controller, which measures peripheral temperature and adjusts the voltage difference between power voltages based on user-set luminance levels, optimizing power consumption by selecting appropriate voltage levels from pre-defined tables according to temperature and luminance settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If constant power voltage is output regardless of temperature and luminance settings, then the display structure remains simple, but power consumption increases unnecessarily
Solution Approach 1:
The power voltage is changed from a constant fixed value to a dynamic adjustable value that varies with temperature and luminance settings. The DC-DC converter dynamically adjusts the voltage difference between ELVDD and ELVSS based on real-time temperature detection and user brightness preferences, optimizing power consumption while maintaining display functionality.
Solution Approach 2:
The patent changes the power voltage parameter from a fixed constant to a variable parameter that depends on temperature and luminance level. By establishing a correspondence relationship between temperature/luminance settings and voltage difference levels, the system adjusts power consumption parameters adaptively, reducing waste while ensuring adequate performance.
2Illumination intensity
If higher voltage difference between ELVDD and ELVSS is applied, then brightness and power output increase, but power consumption increases unnecessarily
Solution Approach 1:
The voltage difference parameter between ELVDD and ELVSS is changed from a fixed high value to a dynamically adjusted value. The system establishes a correspondence relationship that maps temperature and luminance settings to appropriate voltage difference levels, ensuring sufficient brightness when needed while reducing voltage difference (and thus power consumption) when lower brightness is sufficient.
Solution Approach 2:
The system incorporates feedback through temperature sensing and user input to adjust the voltage difference. The temperature sensor provides real-time feedback about operating conditions, and the controller uses this feedback along with luminance level settings to dynamically adjust the voltage difference, optimizing the balance between brightness and power consumption.
3Illumination intensity
If constant high power voltage is supplied, then the display can maintain high brightness, but heat generation increases and display lifespan decreases
Solution Approach 1:
The power voltage is transformed from a static constant high voltage to a dynamic adjustable voltage that adapts to actual operating conditions. The DC-DC converter dynamically adjusts the voltage difference based on temperature and luminance requirements, maintaining brightness when necessary while reducing power stress on components during normal operation, thereby extending display lifespan.
Solution Approach 2:
The patent converts the potential harm of excessive heat generation into a beneficial control mechanism. By monitoring temperature through the temperature sensor and using this information to adjust the voltage difference, the system prevents overheating while maintaining adequate brightness. This transforms the temperature parameter from a harmful byproduct into a useful feedback signal for optimizing both brightness and component longevity.
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 reduces power consumption and extends the lifespan of both the display and the organic light emitting diodes by dynamically adjusting power voltages, minimizing heat generation and optimizing energy use based on temperature and brightness settings.
Implementation Method 1
The organic electroluminescent displays render an image by using organic light emitting diodes (OLEDs) that generate light according to recombination of electrons and holes
Implementation Method 2
a temperature sensor configured to measure a peripheral temperature of the organic electroluminescent display
Data Source
AI summary
An organic electroluminescent display and method of driving the display are disclosed. The display includes a power supply voltage generator which generates power voltages according to both a temperature of the display and a luminance level setting.