Display Panel Overcurrent Compensation to Prevent Color Shifts
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Solution Overview
Problem
Display apparatuses suffer from color shifts in overcurrent conditions, leading to deteriorated display quality due to the decrease in power voltage to prevent damage.
Innovation Solution
A display apparatus with a current sensor to detect overcurrent, a driving controller to generate compensation values, and a data driver to adjust data voltages, preventing color shifts by adjusting grayscale values and power voltage in overcurrent modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power voltage is decreased to prevent overcurrent damage, then the reliability of the display apparatus is improved, but the display quality deteriorates due to color shift
Solution Approach 1:
The patent changes the parameters of data signals by generating compensation values that adjust grayscale values for different color channels (R, G, B) based on the degree of power voltage decrease. This allows the display to maintain color accuracy even when operating under reduced power voltage conditions during overcurrent events.
Solution Approach 2:
The patent implements a feedback mechanism where the driving controller monitors power voltage levels and panel current, then dynamically adjusts data signals in response. The compensation values are generated based on real-time detection of power voltage decrease, creating a closed-loop system that maintains display quality despite varying electrical conditions.
2Object-affected harmful factors
If the power voltage is decreased to prevent overcurrent damage, then the safety of the display apparatus is improved, but the color accuracy of the display image deteriorates
Solution Approach 1:
The patent applies parameter changes by generating compensation values that specifically adjust the grayscale parameters of R, G, and B color channels. When power voltage decreases, the controller calculates appropriate compensation values to offset the color shift that would otherwise occur, thereby maintaining color accuracy despite the harmful overcurrent condition.
Solution Approach 2:
The patent performs preliminary action by pre-calculating and applying compensation values before the color shift becomes visually apparent. The driving controller proactively adjusts the data signals based on detected power voltage changes, preventing color degradation rather than attempting to correct it after the fact.
3Manufacturing precision
If the grayscale values are adjusted to compensate for color shift, then the display quality is improved, but the complexity of the driving controller increases
Solution Approach 1:
The patent manages complexity by systematically changing parameters through a structured method: detecting power voltage levels, calculating compensation values based on the degree of decrease, and applying these values to adjust grayscale parameters. This organized approach to parameter changes achieves display quality improvement while keeping the control logic manageable.
Solution Approach 2:
The driving controller performs self-service by autonomously monitoring its own operating conditions (power voltage levels) and automatically generating appropriate compensation values without external intervention. This self-regulating capability maintains display quality while minimizing the need for additional external control circuitry.
Data Source
AI summary
A display apparatus includes a display panel, a power voltage generator, a current sensor, a driving controller and a data driver. The power voltage generator is configured to generate a power voltage and output the power voltage to the display panel. The current sensor is configured to sense a panel current of the display panel and output an overcurrent signal based on the panel current being greater than a threshold value. The driving controller is configured to generate a compensation value based on the overcurrent signal and generate a data signal to which the compensation value is applied. The data driver is configured to generate a data voltage based on the data signal and output the data voltage to the display panel.