Display Panel Black Voltage Tuning Across Frequency and Luminance
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Solution Overview
Problem
Existing display technologies face issues with increased power consumption and instantaneous afterimages due to high black voltages and fixed luminance settings, leading to hysteresis in driving switching elements, especially at low luminance and high frequency.
Innovation Solution
The display apparatus adjusts black voltage and anode initialization voltage based on driving frequency and luminance setting values to optimize display quality and reduce power consumption, with different settings for each pixel color to prevent biased black images and undesired luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the black voltage is increased to reduce black luminance, then the black luminance is reduced, but the power consumption increases and the range between lowest and highest grayscale voltage increases causing instantaneous afterimage
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the black voltage based on driving frequency and luminance setting values. Instead of using a fixed high black voltage, the system selects from multiple black voltage values stored in a lookup table, choosing the appropriate value based on current operating conditions. This resolves the contradiction by finding the minimum necessary black voltage to achieve target black luminance, thereby reducing power consumption while preventing instantaneous afterimage.
Solution Approach 2:
The patent implements dynamics by making the black voltage adaptive rather than static. The black voltage is dynamically determined based on real-time parameters including driving frequency and luminance setting values. The system continuously adjusts the black voltage to match current operating conditions, ensuring optimal performance across varying scenarios without consistently using high voltage that would increase power consumption.
2Illumination intensity
If the black voltage is increased to reduce black luminance, then the black luminance is reduced, but the range between lowest grayscale voltage and highest grayscale voltage increases causing instantaneous afterimage due to hysteresis
Solution Approach 1:
The patent uses parameter changes to optimize the black voltage level based on driving frequency and luminance setting values. By selecting from multiple pre-stored black voltage values, the system achieves the minimum necessary voltage to reach target black luminance, thereby reducing the grayscale voltage range and minimizing hysteresis effects that cause instantaneous afterimage, thus maintaining display quality.
Solution Approach 2:
The patent implements feedback by measuring the actual black luminance and comparing it to the target black luminance. Based on this comparison and the driving frequency, the system adjusts the black voltage selection from the lookup table to achieve the desired luminance level. This feedback mechanism ensures that the black voltage is optimized for each specific operating condition, preventing both excessive voltage (which causes afterimage) and insufficient voltage (which fails to meet luminance targets).
3Ease of operation
If a fixed black voltage is used regardless of luminance setting value, then the control is simple, but a higher black voltage than necessary is used at low luminance settings increasing power consumption and causing instantaneous afterimage
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed black voltage to a dynamic adaptive black voltage system. The black voltage is automatically adjusted based on driving frequency and luminance setting values without requiring manual intervention. This maintains ease of operation while significantly reducing power consumption by using only the necessary voltage level for each specific luminance setting.
Solution Approach 2:
The patent uses parameter changes to optimize black voltage based on luminance setting values and driving frequency. The system stores multiple black voltage values in a lookup table and automatically selects the appropriate value based on current parameters. This approach maintains control simplicity through automated parameter-based selection while avoiding the power waste and display quality issues associated with using a fixed high black voltage across all conditions.
4Ease of operation
If a fixed black voltage is used regardless of luminance setting value, then the control is simple, but the instantaneous afterimage occurs due to increased grayscale voltage range
Solution Approach 1:
The patent implements dynamics by making the black voltage adaptive based on luminance setting values and driving frequency. The system automatically adjusts the black voltage to match current operating conditions, maintaining control simplicity through automated adjustment while optimizing display quality by minimizing the grayscale voltage range and reducing instantaneous afterimage effects.
Solution Approach 2:
The patent uses parameter changes to optimize black voltage selection based on luminance setting values and driving frequency. By storing multiple black voltage values and automatically selecting the appropriate one based on current parameters, the system maintains ease of operation while significantly improving display quality by preventing the instantaneous afterimage caused by excessive voltage range.
5Illumination intensity
If a higher black voltage is used in high frequency driving method, then the black luminance control is effective, but the power consumption further increases
Solution Approach 1:
The patent applies parameter changes by selecting black voltage values based on both luminance setting and driving frequency. The system stores multiple black voltage values indexed by frequency and luminance settings, automatically choosing the optimal voltage for each combination. This resolves the contradiction by using the minimum necessary voltage for effective black luminance control at each frequency, thereby reducing power consumption while maintaining control effectiveness.
Solution Approach 2:
The patent implements dynamics by making the black voltage adaptive to both luminance settings and driving frequency. The system continuously adjusts the black voltage based on real-time operating conditions, ensuring effective black luminance control at high frequencies without consistently using high voltage that would increase power consumption.
Data Source
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AI summary
A display apparatus includes a display panel, a data driver and a driving controller. The data driver is which outputs a data voltage to the display panel. The driving controller determines a black voltage based on a driving frequency and a luminance setting value and determines an anode initialization voltage based on the driving frequency and the luminance setting value. A first anode initialization voltage of a first pixel having a first color is different from a second anode initialization voltage of a second pixel having a second color.