Display Panel Voltage Selection to Limit Afterimages and Power Consumption
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Solution Overview
Problem
Existing display technologies face issues with high power consumption and instantaneous afterimages due to improper adjustment of black voltage and anode initialization voltage, especially at low luminance settings and high driving frequencies, leading to increased voltage ranges and undesired luminance in interpolation regions.
Innovation Solution
The display apparatus determines black voltage and anode initialization voltage based on driving frequency and luminance setting values, adjusting these voltages to ensure the measured luminance is below target levels and reducing the voltage range to prevent afterimages and power consumption.
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 voltage range increases causing instantaneous afterimage
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the black voltage based on the driving frequency and luminance setting value rather than using a fixed voltage. The driving controller determines the black voltage from a lookup table that provides optimized voltage values for different operating conditions, allowing the system to maintain low black luminance without excessively increasing power consumption or voltage range.
2Illumination intensity
If the black voltage is increased to reduce black luminance, then the black luminance is reduced, but the voltage range increases causing instantaneous afterimage due to hysteresis
Solution Approach 1:
The patent dynamically changes the black voltage parameter based on driving frequency and luminance setting value. By selecting optimized voltage values from a lookup table for different operating conditions, the system reduces black luminance while minimizing the voltage range, thereby preventing instantaneous afterimage caused by hysteresis in the driving switching elements.
3Device complexity
If a fixed black voltage is used regardless of luminance setting value, then the control is simple, but a higher than desired black voltage is used at low luminance settings increasing power consumption
Solution Approach 1:
The patent transitions from a static fixed black voltage to a dynamic voltage selection mechanism. The driving controller dynamically selects the black voltage from a lookup table based on the current driving frequency and luminance setting value, allowing the system to optimize power consumption for each operating condition while maintaining simple overall control architecture.
Solution Approach 2:
The system uses feedback from the driving frequency and luminance setting value to automatically adjust the black voltage. The driving controller continuously monitors these parameters and selects the appropriate black voltage from the lookup table, ensuring optimal power consumption without requiring manual intervention or complex control algorithms.
4Device complexity
If a fixed black voltage is used regardless of luminance setting value, then the control is simple, but a higher than desired black voltage is used at low luminance settings causing instantaneous afterimage
Solution Approach 1:
The patent implements dynamic voltage selection based on operating conditions. The driving controller adjusts the black voltage according to the driving frequency and luminance setting value, preventing instantaneous afterimage at low luminance settings while maintaining simple control through a lookup table approach rather than complex real-time calculations.
5Illumination intensity
If a higher black voltage is used in high frequency driving method, then the black luminance control is maintained, but the power consumption further increases
Solution Approach 1:
The patent optimizes the black voltage parameter specifically for high frequency driving conditions by providing separate optimized voltage values in the lookup table for different frequency ranges. This allows the system to maintain effective black luminance control at high frequencies while minimizing power consumption by using the lowest necessary voltage for each frequency condition.
6Device complexity
If the black voltage is set at predetermined measuring points of the luminance setting value, then the control is simple, but an undesired high luminance occurs in the interpolation range between the measuring points
Solution Approach 1:
The patent segments the luminance setting value range into multiple intervals with dedicated optimized black voltage values for each interval. By providing specific voltage values for different segments of the luminance range in the lookup table, the system eliminates undesired high luminance in interpolation regions while maintaining simple control through pre-calculated optimal values for each segment.
Data Source
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.