Dynamic Voltage Tuning for Display Hysteresis Artifacts
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Solution Overview
Problem
Electronic displays at lower refresh rates experience visual artifacts such as flicker and variable luminance due to hysteresis in transistors, which are not effectively mitigated by existing technologies.
Innovation Solution
Dynamic voltage tuning is applied to display pixels by adjusting bias voltages between subframes, using a lookup table to determine optimal voltage sequences based on conditions like display panel temperature and brightness, to counteract hysteresis effects and maintain consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate is reduced to save power, then energy consumption decreases, but visual artifacts such as flicker and luminance variation increase
Solution Approach 1:
The patent applies dynamic bias voltage adjustment where the bias voltage is not fixed but dynamically tuned based on the subframe number and display conditions. This dynamic adjustment compensates for hysteresis effects that cause luminance variation, allowing low refresh rates to be used without exhibiting visual artifacts like flicker.
Solution Approach 2:
The patent changes the bias voltage parameter between subframes to counteract hysteresis effects. By adjusting this electrical parameter dynamically, the system maintains consistent luminance output even at low refresh rates, thereby reducing visual artifacts while preserving energy savings.
2Use of energy by moving object
If the refresh rate is reduced, then power consumption decreases, but hysteresis effects cause noticeable light emission variation between subframes
Solution Approach 1:
The bias voltage is dynamically adjusted for each subframe based on predetermined sequences stored in lookup tables. This dynamic tuning compensates for cumulative hysteresis effects, maintaining stable light emission consistency across all subframes even when the overall refresh rate is low.
Solution Approach 2:
The patent uses predetermined bias voltage sequences that are determined in advance through calibration processes. These pre-calculated voltage sequences are stored in lookup tables and applied to compensate for hysteresis effects before they manifest as visible artifacts, ensuring stable light emission from the outset.
3Object-affected harmful factors
If different bias voltages are applied to different subframes, then hysteresis effects are counteracted, but device complexity increases
Solution Approach 1:
The patent performs calibration in advance to determine optimal bias voltage sequences for different display conditions (temperature, brightness, refresh rate). These pre-determined sequences are stored in lookup tables within the display driver circuitry, eliminating the need for complex real-time calculations and reducing operational complexity.
Solution Approach 2:
The display driver circuitry automatically selects and applies the appropriate bias voltage sequence from the lookup tables based on current display conditions. This self-service mechanism eliminates the need for external complex control systems, as the circuitry autonomously manages the dynamic bias voltage adjustment to counteract hysteresis effects.
4Object-affected harmful factors
If calibration is performed to determine optimal bias voltages, then visual artifacts are reduced, but manufacturing time and complexity increase
Solution Approach 1:
The calibration process is performed during manufacturing to pre-determine optimal bias voltage sequences for different display conditions. These calibration results are stored in lookup tables that are permanently integrated into the display driver circuitry. This preliminary calibration eliminates the need for complex real-time adjustments during operation, simplifying both manufacturing and usage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces or eliminates flicker and variable refresh rate luminance differences, improving the uniformity of light emission and reducing visual artifacts across subframes.
Implementation Method 1
hysteresis in transistors of the display pixels could cause the amount of light emitted to vary noticeably from subframe to subframe
Data Source
AI summary
Systems, methods, and devices are provided for mitigating visual artifacts by dynamically tuning bias voltages applied to display pixels. An electronic display may include a display pixel and a bias voltage supply. The bias voltage supply may supply a first bias voltage to the display pixel for a first subframe of a frame of image data. The bias voltage supply may supply a different second bias voltage to the display pixel for a second subframe of the frame of image data. This may mitigate certain image artifacts, such as flicker or variable refresh rate luminance difference, that could arise due to display pixel hysteresis that varies across subframes of the image frame.