Display Device Overdriving Sensing Voltage Compensation
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Solution Overview
Problem
The increasing resolution of display devices leads to longer pixel sensing times, which degrades image quality due to changes in pixel characteristic values, and existing compensation methods are not effective in enhancing compensation reliability.
Innovation Solution
A display device with an improved data driver and driving method that applies different sensing data voltages in various modes to reduce sensing time, calculates gain and offset values for video data compensation, and uses a digital-to-analog converter with an offset compensator to enhance compensation reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of display devices is increased, then the image quality is improved, but the time required for pixel sensing increases
Solution Approach 1:
The patent applies parameter changes by switching between different sensing drive modes (normal mode with first sensing data voltage and overdriving mode with second sensing data voltage). By changing the voltage parameter based on pixel type, the sensing time is reduced without compromising image quality. Specifically, overdriving mode uses a higher second sensing data voltage to accelerate sensing for pixels where speed is critical, while normal mode uses a lower first sensing data voltage for other pixels, thereby optimizing the overall sensing time.
2Quantity of substance
If the number of pixels is increased, then the resolution is improved, but the time required for pixel sensing increases
Solution Approach 1:
The patent applies local quality by differentiating sensing approaches for different pixel types. Instead of using a uniform sensing method for all pixels, the system identifies specific pixel types that require faster sensing and applies overdriving mode with a second sensing data voltage to those pixels, while using normal sensing mode for other pixels. This localized optimization reduces the overall sensing time across the increased number of pixels.
3Reliability
If compensation reliability is enhanced, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation function into two parts: the timing controller calculates gain values for video data compensation, while the data driver calculates offset values based on sensed pixel characteristics. This segmentation allows each component to specialize in one aspect of compensation, improving overall reliability while distributing the complexity across multiple components rather than concentrating it in one complex unit.
Data Source
AI summary
The embodiments relate to a display device and driving method thereof. The display device includes a display panel including a plurality of pixels arranged thereon, a data driver configured to apply a sensing data voltage to the plurality of pixels and output a characteristic value sensed in response to the sensing data voltage as sensing data, and a timing controller configured to compensate video data based on the sensing data and transmit compensated video data and a control signal to the data driver, wherein the timing controller applies a first sensing data voltage to the plurality of pixels in a normal sensing drive mode and a second sensing data voltage higher than the first sensing data voltage to the plurality of pixels in an overdriving sensing drive mode.