Dual Modulation Display Drive Value Adjustment
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Solution Overview
Problem
Dual modulation displays face inefficiencies and artifacts due to inconsistent light source modulation, leading to loss of detail, texture, and color shifts, as they struggle to compensate for overly bright or dim regions, resulting in suboptimal operation and increased power consumption.
Innovation Solution
The method involves adjusting light source modulation layer drive values based on previous frame's display modulation layer drive values, flagging regions that received too much or too little light, and iteratively refining these values to achieve optimal luminance profiles, thereby reducing artifacts and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light source modulation layer provides excessive light to certain areas, then the display can achieve sufficient brightness, but the affected area appears clipped to minimum brightness level causing loss of detail, raised black levels, and color shifts
Solution Approach 1:
The patent applies local quality by adjusting the light source modulation layer drive values specifically for flagged regions where clipping artifacts occurred. Instead of uniformly adjusting the entire display, the system identifies problematic areas and applies localized corrections to those specific regions, making different parts of the light source modulation layer have different drive values based on their individual performance characteristics.
Solution Approach 2:
The patent implements feedback by using the display modulation layer drive values from a first frame to identify clipping artifacts, then using this information to adjust the light source modulation layer drive values for subsequent frames. The system continuously monitors for clipping conditions and adjusts the light source accordingly to prevent recurrence, creating a closed-loop control system that improves image quality over time.
2Loss of energy
If the light source modulation layer does not provide enough light to certain areas, then power consumption is reduced, but the affected area appears clipped to maximum brightness level causing loss of texture, decreased white levels, and color shifts
Solution Approach 1:
The patent applies local quality by providing targeted light supplementation only in regions that were flagged as having insufficient light or clipping artifacts. The system adjusts light source modulation layer drive values locally for these specific regions rather than increasing overall display brightness, thereby maintaining energy efficiency while improving image quality in problematic areas.
Solution Approach 2:
The patent implements feedback by monitoring display modulation layer drive values to identify regions with insufficient light output or clipping artifacts, then adjusting the light source modulation layer drive values for those specific regions in subsequent frames. This closed-loop approach ensures adequate lighting where needed while maintaining overall power efficiency.
3Stability of the object's composition
If display modulation layer pixels are driven to lower transmissivity states to compensate for overly bright regions, then brightness uniformity improves, but display efficiency decreases
Solution Approach 1:
The patent applies preliminary action by adjusting the light source modulation layer drive values in advance based on predicted or previously observed clipping conditions. By proactively modifying the light source output before the display modulation layer needs to compensate, the system prevents the need for pixels to be driven to extreme transmissivity states, thereby maintaining both brightness uniformity and display efficiency.
Solution Approach 2:
The patent implements feedback by using information from previous frames about clipping artifacts to adjust light source modulation layer drive values for current frames. This allows the system to maintain brightness uniformity through light source adjustments rather than relying on display modulation layer compensation, preserving display efficiency while achieving uniformity.
Data Source
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AI summary
Method and apparatus are provided for determining and adjusting drive values for a display comprising a light source modulation layer such as a backlight array of LED and a display modulation layer such as an LCD panel. Image regions for which any of the display modulation layer drive values are above a predetermined threshold maximum value or below a predetermined threshold minimum value are flagged. The light source modulation layer control values determined for a subsequent frame of image data may be adjusted based on the flagged image regions. The adjustments to the light source modulation layer control values may reduce artifacts in the displayed image and increase the efficiency of the display.