OLED Voltage Controller Reduces Power via Adaptive Margin
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Solution Overview
Problem
Conventional organic light emitting displays experience high power consumption due to voltage margins added to account for process deviations and temperature characteristics, which can account for 20% to 30% of total power usage.
Innovation Solution
An organic light emitting display with a voltage controller that adjusts the second power supply voltage based on the voltage applied to specific pixels, using a comparator and digital-analog converters to minimize the voltage margin, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage margins are added to account for process deviations and temperature characteristics, then display performance stability is improved, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the voltage margin adaptive rather than fixed. The voltage controller dynamically adjusts the voltage margin based on real-time temperature sensing and process deviation detection, allowing the system to maintain display performance stability while minimizing power consumption under different operating conditions
Solution Approach 2:
The patent changes the voltage margin parameter dynamically based on temperature and process conditions. By sensing temperature variations and detecting process deviations, the system adjusts the voltage margin parameter to match actual operating conditions, reducing unnecessary power consumption while maintaining display stability
2Manufacturing precision
If a fixed voltage margin is used to compensate for process deviations, then manufacturing tolerance is improved, but energy efficiency deteriorates
Solution Approach 1:
The patent implements self-service by enabling the display system to automatically detect and compensate for its own process deviations and temperature variations. The voltage controller senses actual operating conditions and self-adjusts the voltage margin, eliminating the need for excessive fixed margins while maintaining compensation effectiveness
Solution Approach 2:
The patent uses feedback mechanisms where the voltage controller continuously monitors temperature and display performance, then adjusts the voltage margin based on this feedback. This closed-loop control ensures adequate compensation for process deviations while optimizing energy efficiency by avoiding excessive voltage margins
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 reduces power consumption by dynamically controlling the voltage margin corresponding to temperature and process deviations, optimizing power usage without compromising display performance.
Implementation Method 1
the organic light emitting display displays an image utilizing organic light emitting diodes (OLEDs) that generate light by the recombination of electrons and holes
Data Source
AI summary
An organic light emitting display and a driving method thereof capable of reducing power consumption. A driving transistor controls a current through an organic light emitting diode of the display. A voltage controller supplies a first voltage to the anode of the OLED of at least one specific pixel and controls the cathode voltage of the OLED in correspondence to a second current through the OLED, such that the cathode voltage corresponds to the first voltage supplied to the OLED. Thus, the driving transistor can be driven in saturation mode with consistent current in spite of process variations, with a reduced power consumption.