Peak Luminance Control for HDR Displays Under Power Limits
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Solution Overview
Problem
Electronic displays that draw excessive power can cause malfunctions such as front-of-screen artifacts, panel overheating, and voltage-current drops, while limiting pixel power to prevent this reduces the dynamic range and capability to show high dynamic range images.
Innovation Solution
Estimate and modulate peak luminance in real-time by counting pixel pulses in discrete time bins to ensure power draw does not exceed thresholds, adjusting PMIC or image data to maintain high dynamic range and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pixel power is limited to prevent excessive power draw, then power consumption is controlled, but dynamic range and high dynamic range image capability are reduced
Solution Approach 1:
The patent implements dynamic peak luminance modulation that adjusts pixel brightness in real-time based on actual power draw conditions. The system monitors power consumption during image display and dynamically modulates the peak luminance of pixels to prevent excessive power draw while preserving the ability to display high dynamic range images when power conditions permit.
Solution Approach 2:
The system changes the peak luminance parameter of pixels based on monitored power consumption levels. By adjusting this key parameter dynamically, the system optimizes the balance between power consumption and image quality, enabling high dynamic range display capability when power is available while preventing excessive power draw when it is not.
2Use of energy by moving object
If peak luminance is modulated to prevent excessive power draw, then power consumption is controlled, but image brightness is reduced
Solution Approach 1:
The patent employs a feedback mechanism that monitors actual power draw during image display and uses this information to adjust peak luminance modulation. The system continuously monitors power consumption and adjusts the modulation depth accordingly, ensuring that image brightness is maintained at the highest possible level while staying within power consumption thresholds.
3Reliability
If worst-case scenario power limiting is applied, then excessive power draw is prevented, but all pixels are limited reducing overall display capability
Solution Approach 1:
The patent applies local quality by allowing different pixels to operate at different luminance levels based on their individual contribution to total power draw. Rather than uniformly limiting all pixels, the system selectively modulates peak luminance on a per-pixel or per-region basis, preserving display capability in areas where power consumption is lower while controlling overall power draw.
Data Source
AI summary
The present disclosure is directed to estimating and modulating peak luminance of the display substantially in real-time to allow very bright pixels to be shown on the electronic display as long as the total electrical energy drawn by the electronic display does not exceed a threshold. The amount of electrical energy that is being drawn by the electronic display may be estimated from the image data by counting the number of rows of pixels that are emitting pulses in discrete bins of time. Because the pulses draw a predictable amount of electrical energy per row per time bin, the amount of electrical energy drawn by the electronic display may be estimated substantially in real time. The image data on the electronic display may therefore be modulated to avoid drawing too much electrical energy from the power source of the electronic device while permitting a high dynamic range.