Display Driving Controller Pixel Degradation Compensation
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Solution Overview
Problem
Display devices face degradation of pixels, leading to decreased luminance and increased power consumption due to insufficient current flow through light emitting diodes, despite increased data voltage, as voltage of the light emitting diode and drain-source voltage of the driving transistor decrease.
Innovation Solution
A driving controller that calculates a driving voltage increase amount based on pixel degradation, adjusts the driving voltage, and uses scale factors to compensate for power increases, thereby compensating pixel degradation and reducing global current flow to minimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If data voltage is increased to compensate for pixel degradation, then luminance of degraded pixels is improved, but power consumption of the display device increases
Solution Approach 1:
The patent applies local quality by differentiating compensation strategies between degraded pixels and non-degraded pixels. The controller identifies degraded pixels through sensing circuits and applies targeted voltage compensation only to these specific pixels, rather than uniformly increasing voltage across the entire display. This localized approach restores luminance to degraded pixels while avoiding unnecessary power consumption in pixels that do not require compensation.
Solution Approach 2:
The patent changes electrical parameters (voltage and current) dynamically based on the degradation state of pixels. The controller adjusts the driving voltage and current values for degraded pixels based on sensing results, rather than maintaining fixed parameters. This adaptive parameter adjustment allows the system to compensate for degradation while optimizing power consumption by applying changes only where necessary.
2Illumination intensity
If current flowing through light emitting diode is increased to compensate for degradation, then luminance is improved, but voltage of light emitting diode and drain-source voltage of driving transistor decrease
Solution Approach 1:
The patent implements feedback by using sensing circuits to measure the actual state of pixels (degradation level, voltage, current) and using this information to adjust compensation parameters. The controller continuously monitors pixel performance and adjusts driving voltages and currents based on this feedback, creating a closed-loop system that maintains optimal luminance while managing voltage levels and power consumption effectively.
Data Source
AI summary
A display device includes a display unit which includes a plurality of pixels, a degradation controller which includes a voltage compensator configured to calculate a driving voltage increase amount based on a degradation amount of a maximum degradation pixel among the pixels and a global current controller configured to calculate calculates a first scale factor for compensating a power increase amount according to the driving voltage increase amount, a driving voltage provider which is configured to increase a driving voltage provided to the pixels based on the driving voltage increase amount, a data compensator which is configured to generate output image data by scaling the first scale factor to grayscale values of input image data, and a data driver which is configured to provide data voltages to the pixels based on the output image data.