OLED Display Dynamic Voltage Adjustment for Power and Lifespan
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Solution Overview
Problem
OLED displays face high power consumption and reduced lifespan due to the use of fixed high voltages, which are not adapted to the display panel's deterioration state, leading to insufficient voltage margins and increased power consumption.
Innovation Solution
An OLED display system that includes a deterioration sensing unit and a timing controller to continuously vary the high voltage based on the display panel's deterioration state, using factors like threshold voltage variation, driving time accumulation, and average picture level to adjust the voltage and reduce power consumption while extending the display's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high voltage is used to drive the display panel, then the driving transistor operates in the saturation region ensuring stable operation, but power consumption increases unnecessarily
Solution Approach 1:
The patent applies dynamics by continuously varying the high voltage (EVDD) from a fixed value to a dynamically adjustable value based on the display panel's deterioration state. The timing controller adjusts EVDD in real-time according to feedback from the deterioration sensing unit, allowing the system to transition from static operation to adaptive operation, thereby reducing power consumption while maintaining stable display performance.
Solution Approach 2:
The patent changes the voltage parameter (EVDD) from a constant high voltage to a variable voltage that is continuously adjusted based on the deterioration factor. By modifying the voltage parameter dynamically according to the panel's actual state, the system achieves optimal power consumption at different stages of panel deterioration while maintaining reliable operation.
2Device complexity
If the high voltage is fixed, then the circuit operation is simple, but the service life of the display panel is reduced due to insufficient voltage margins
Solution Approach 1:
The patent implements feedback by introducing a deterioration sensing unit that continuously monitors the display panel's state and provides feedback to the timing controller. The timing controller uses this feedback to adjust the high voltage (EVDD) dynamically, ensuring that the voltage margin is sufficient to compensate for panel deterioration. This closed-loop control extends the service life without significantly increasing circuit complexity.
Solution Approach 2:
The system performs self-service by automatically adjusting the high voltage based on the panel's own deterioration state. The deterioration sensing unit monitors the panel's health, and the timing controller autonomously modifies EVDD to compensate for aging effects, eliminating the need for manual intervention and extending the display's operational lifespan.
3Reliability
If a high data voltage is used to compensate for deterioration, then the display performance is maintained, but the voltage increase margin is insufficient and lifespan is reduced
Solution Approach 1:
The patent applies dynamics by continuously adjusting the high voltage (EVDD) based on the deterioration factor rather than using a fixed high voltage or a simple switching scheme. This dynamic adjustment allows the system to maintain display performance while preserving voltage margins, thereby extending the overall lifespan of the display panel.
Solution Approach 2:
The patent changes the voltage parameter (EVDD) dynamically based on the deterioration state, allowing the system to optimize the voltage margin at different stages of panel aging. By adjusting EVDD rather than relying solely on increasing data voltage, the system maintains display performance while preserving longer-term reliability and lifespan.
Data Source
AI summary
An organic light-emitting diode (OLED) display can include a display panel including sub-pixels; a deterioration sensing unit configured to sense a deterioration state of the display panel; a power supply configured to output a high voltage for driving the sub-pixels; and a timing controller configured to: receive a deterioration sensing result including information on the deterioration state of the display panel from the deterioration sensing unit, continuously vary the high voltage based on the deterioration sensing result received from the deterioration sensing unit, and provide the varied high voltage to the sub-pixels.