OLED Power Supply Voltage Adaptation for Battery Life
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Solution Overview
Problem
Organic light emitting display devices face challenges in extending battery use time and maintaining usage stability, particularly in portable devices like cellular phones, due to limitations in the voltage range of the driving power generated from batteries.
Innovation Solution
The solution involves a wider voltage range for the driving power generated by the power supply unit, which includes a controller that senses battery voltage and adjusts the voltage of the power supplies to maintain optimal brightness and efficiency, allowing the device to operate at lower voltages for longer battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the voltage range of driving power is limited by battery characteristics, then the device can operate with standard battery components, but the battery use time is reduced and brightness cannot be maintained at lower voltages
Solution Approach 1:
The power supply unit dynamically adjusts its operating voltage range based on battery voltage levels. When battery voltage drops below the standard operating range, the power supply unit adapts by operating at lower voltages while maintaining brightness through enhanced conversion efficiency, thus extending battery use time without sacrificing display quality
Solution Approach 2:
The invention changes the operating voltage parameters of the power supply unit to match battery voltage levels. By adjusting the voltage conversion ratio and operating points, the system maintains optimal brightness at both high and low battery voltages, preventing the traditional trade-off between battery life and display quality
2Adaptability or versatility
If the power supply unit operates at fixed voltage levels, then the circuit design is simplified, but the device cannot adapt to battery voltage drops and loses brightness control
Solution Approach 1:
The power supply unit incorporates feedback mechanisms that monitor battery voltage levels and automatically adjust operating parameters. This feedback control enables the system to adapt to varying battery voltages while maintaining stable output, with the control circuit complexity justified by the significant gain in adaptability and extended battery life
Solution Approach 2:
The power supply unit is designed to perform multiple functions: standard voltage conversion during normal operation and adaptive low-voltage operation during battery depletion. This multi-functionality allows a single circuit design to handle the entire battery voltage range, reducing the need for separate circuit configurations
Data Source
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AI summary
An organic light emitting display device, and a driving method for the same. The organic light emitting display device includes: a pixel unit configured to display an image corresponding to a data signal, a scan signal, a first power, and a second power; a data driver configured to receive an image signal to output the data signal; a scan driver configured to output the scan signal; a power supply unit configured to receive an input power from an external source to generate the first power and the second power; and a controller configured to output a voltage control signal to control a voltage of the first power and a voltage of the second power and output a first gamma value and a second gamma value in accordance with a voltage of the input power, the first and second gamma values being for controlling a voltage of the data signal.