Display Panel Degradation-Based Reference Current Control
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Solution Overview
Problem
Display devices experience degradation over time, leading to increased power currents and potential overcurrents that can cause damage, with existing systems frequently reducing power voltage unnecessarily, affecting luminance and increasing power consumption.
Innovation Solution
A display device with a controller that calculates panel degradation, adjusts the reference current based on the degradation, and reduces power voltage only when necessary to prevent overcurrents, while compensating for panel degradation by adjusting image data to maintain luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power voltage is frequently decreased to prevent overcurrent, then the safety and reliability of the display panel is improved, but the luminance and display quality deteriorate, and power consumption increases
Solution Approach 1:
The reference current is dynamically adjusted based on the calculated panel degradation amount. As the panel degrades over time, the reference current is increased to accommodate the higher actual current requirements, allowing the power voltage to be maintained at appropriate levels without unnecessary decreases that would harm luminance and increase power consumption.
Solution Approach 2:
The system continuously monitors the power current and compares it with the dynamically adjusted reference current. Based on this feedback, the power voltage is only decreased when truly necessary (when actual current exceeds the adjusted reference), preventing unnecessary voltage reductions that would degrade display quality and increase power consumption.
2Measurement precision
If the reference current is increased to accommodate panel degradation, then the accuracy of overcurrent detection is improved, but the risk of false overcurrent detection increases
Solution Approach 1:
The system performs preliminary calculation of the panel degradation amount based on accumulated stress information before adjusting the reference current. This preliminary assessment allows the reference current to be proactively adjusted to match the panel's actual capabilities, improving detection accuracy while preventing false positives by basing adjustments on concrete degradation data rather than arbitrary increases.
Solution Approach 2:
The reference current parameter is changed based on the calculated panel degradation amount. By tying the parameter change to a measurable degradation metric, the system achieves more accurate overcurrent detection while controlling false positives through objective, data-driven adjustments rather than subjective or arbitrary parameter changes.
Data Source
AI summary
A display device includes a display panel including pixels, a power management circuit configured to provide a voltage to the display panel through a power voltage line, and configured to decrease the voltage when a power current of the display panel flowing through the power voltage line is greater than a reference current, and a controller configured to control the power management circuit, and including a panel degradation calculator configured to calculate a panel degradation amount of the display panel, a maximum power current calculator configured to calculate a maximum power current of the display panel based on the panel degradation amount, and a reference current calculator configured to calculate the reference current by multiplying the maximum power current by a gain.