OLED Power Source Voltage Control for Saturation Point Tracking
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Solution Overview
Problem
Conventional OLED display devices face inefficiencies in power consumption due to the need for a predetermined margin in driving voltage to account for OLED deterioration and temperature changes, leading to unnecessary power usage.
Innovation Solution
A driving method that senses and controls the power source voltage to match the saturation voltage corresponding to a saturation point, determined by analyzing differential coefficients between various power source voltage levels and panel currents, thereby optimizing power supply to light emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined margin is set in the driving voltage to account for OLED deterioration and temperature changes, then the thin film transistor can operate with constant current, but power consumption increases unnecessarily
Solution Approach 1:
The patent implements dynamic voltage adjustment by continuously monitoring the actual voltage across the thin film transistor and comparing it with the saturation voltage. The control voltage is dynamically modified based on the difference between actual and saturation voltages, allowing the system to adapt to OLED deterioration and temperature changes while minimizing the voltage margin and reducing power consumption.
Solution Approach 2:
The patent employs feedback control by measuring the actual voltage across the thin film transistor, comparing it with the saturation voltage, and using the difference to adjust the control voltage. This closed-loop feedback mechanism ensures the thin film transistor operates at the optimal saturation point, maintaining constant current while eliminating unnecessary voltage margin and reducing power consumption.
2Use of energy by moving object
If the driving voltage is reduced to minimize power consumption, then power efficiency improves, but the thin film transistor may exit the saturation region and current becomes unstable
Solution Approach 1:
The patent uses feedback control to continuously monitor the actual voltage across the thin film transistor and adjust the control voltage based on the difference between actual and saturation voltages. This ensures the thin film transistor remains in the saturation region even at reduced voltage levels, maintaining current stability while minimizing power consumption.
Solution Approach 2:
The patent changes the control voltage parameter dynamically based on the measured voltage difference. By adjusting the control voltage in real-time according to the actual operating conditions and the saturation voltage reference, the system maintains optimal operation at reduced voltage levels without sacrificing current stability.
Data Source
AI summary
A driving method of a display device that includes a display panel including a plurality of light emitting elements, is supplied with a power source voltage, and includes a saturation region and a non-saturation region according to variation of a panel current flowing to the display panel is provided. The driving method includes sensing the panel current, determining the power source voltage and the panel current, controlling a feedback voltage to drive the power source voltage to be equal to a saturation voltage corresponding to a saturation point at a boundary between the saturation region and the non-saturation region based on the determined power source voltage and the determined panel current, and controlling the power source voltage according to the feedback voltage to supply the controlled power source voltage to each of the plurality of light emitting elements.