Dynamic Driving Voltage Adjustment for OLED Pixel Circuits
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Solution Overview
Problem
Existing methods for adjusting the driving voltage in OLED pixel circuits result in significant dynamic loss and temperature rise, leading to reduced OLED lifespan and increased driving costs due to the application of constant high voltages, even when lower voltages are sufficient for normal operation.
Innovation Solution
A method and apparatus that dynamically adjust the driving voltage for each pixel row based on acquired data voltages, calculating the minimum required voltage to ensure saturation operation of the driving TFT, and configuring a maximum value as the driving voltage for the entire pixel circuit, thereby reducing power loss and temperature rise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relatively high driving voltage ELVDD is applied to ensure the driving TFT operates in saturation region, then the OLED can emit light normally, but power loss increases and temperature rises
Solution Approach 1:
The patent applies dynamics principle by transitioning from a static constant high driving voltage to a dynamic adjustable driving voltage. The driving voltage is dynamically adjusted based on the actual data voltage levels and operational requirements, allowing the system to use higher voltages only when necessary for saturation operation and lower voltages when sufficient for normal operation, thereby reducing overall power loss while maintaining reliable light emission.
Solution Approach 2:
The patent implements parameter changes by modifying the driving voltage parameter from a fixed high value to a variable value that changes according to operational conditions. The driving voltage is adjusted based on data voltage thresholds and operational states, enabling the system to optimize between ensuring saturation operation and minimizing power consumption by changing the voltage parameter adaptively.
2Reliability
If a constant high driving voltage is applied to the pixel circuit, then the driving TFT operates reliably in saturation state, but temperature of elements increases
Solution Approach 1:
The patent applies dynamics principle by implementing a dynamic driving voltage adjustment mechanism that responds to operational conditions. Instead of maintaining a constant high voltage that continuously generates heat, the system dynamically adjusts the voltage level based on whether saturation operation is actually required, thereby reducing unnecessary thermal generation while maintaining operational reliability.
Solution Approach 2:
The patent implements parameter changes by adjusting the driving voltage parameter adaptively based on operational needs. When data voltages indicate that saturation operation is not required, the driving voltage is reduced, which directly decreases power dissipation and element temperature while maintaining sufficient operation reliability.
3Duration of action of stationary object
If a high driving voltage is applied at all timings, then the OLED emits light continuously, but dynamic loss increases when data voltage is low
Solution Approach 1:
The patent implements parameter changes by adjusting the driving voltage parameter based on data voltage levels and operational timing. When data voltages are low and saturation operation is not required, the driving voltage is reduced accordingly, minimizing dynamic losses. When higher data voltages are applied or continuous emission is required, the driving voltage is increased to maintain reliable operation, thus optimizing the balance between continuous light emission and energy efficiency.
Data Source
AI summary
In the method provided by the present disclosure, the driving voltage for the pixel circuit is dynamically adjusted in accordance with data voltages in each pixel row. Accordingly, as compared with a traditional method where a constant voltage is applied to the pixel circuit, the method provided therein is able to greatly reduce a dynamic loss and a temperature rise of an OLED pixel circuit and prolong the life of the OLED while reducing the driving cost.