Display Brightness Calibration via Zone-Based Sub-Frame Grouping
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Solution Overview
Problem
Conventional display calibration techniques fail to account for variations in light emitting elements' performance, leading to inconsistencies in brightness across digital displays, which can affect user experience, especially in near-eye displays and other applications requiring uniform illumination.
Innovation Solution
A method involving the grouping of light emitters based on measured brightness levels, assigning different sub-frame durations to each group, and storing calibration information to ensure uniform perceived brightness through frame binning, where emitters are activated for durations corresponding to their sub-frame assignments, allowing for simultaneous activation of groups with overlapping sub-frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional calibration techniques are used to calibrate each light emitting element independently, then the calibration process is simple and fast, but the display uniformity deteriorates due to manufacturing variations and degradation
Solution Approach 1:
The patent segments the display into multiple zones based on light emitter groups, where each zone contains emitters with similar brightness characteristics. This segmentation allows for zone-based calibration rather than individual emitter calibration, reducing complexity while maintaining uniformity. The display is divided into zones that can be independently calibrated, enabling efficient handling of manufacturing variations across different regions.
Solution Approach 2:
The patent changes the calibration parameter from individual emitter brightness adjustment to zone-based brightness adjustment. By measuring and comparing brightness levels across zones, the system identifies zones with abnormal brightness variations and applies corrective measures at the zone level. This parameter change from micro-level (individual emitter) to macro-level (zone) calibration reduces the complexity of the calibration process while effectively addressing uniformity issues caused by manufacturing variations and degradation.
2Manufacturing precision
If no calibration is performed to compensate for performance differences, then the calibration process is fast and simple, but the brightness uniformity across the display deteriorates
Solution Approach 1:
The display is segmented into multiple zones for efficient calibration. Instead of calibrating each light emitter individually, the system groups emitters into zones based on their spatial arrangement and brightness characteristics. This segmentation enables parallel processing of calibration data across zones, significantly reducing the total calibration time while maintaining brightness uniformity. The zone-based approach allows the system to handle large numbers of emitters without proportionally increasing calibration time.
Solution Approach 2:
The patent implements a selective calibration approach where not all zones require the same level of calibration intervention. The system measures brightness levels across all zones, identifies zones with abnormal variations exceeding predetermined thresholds, and applies calibration corrections only to those specific zones. This partial action approach avoids unnecessary calibration steps in already uniform zones, reducing overall calibration time while ensuring brightness uniformity in problematic areas.
3Reliability
If individual light emitting elements are calibrated independently, then the calibration process is straightforward, but the overall display performance deteriorates due to unaccounted interactions between adjacent elements
Solution Approach 1:
The patent merges the calibration of adjacent light emitters into zone-based calibration units. By combining multiple emitters into zones, the system accounts for interactions between adjacent elements while reducing the number of independent calibration operations. The zone-based approach allows the system to consider the collective performance of emitter groups, capturing interaction effects that would be missed in individual emitter calibration, thereby improving overall display reliability without excessive complexity.
Solution Approach 2:
The patent changes the calibration parameter from individual emitter characteristics to zone-level brightness characteristics. By measuring and comparing the aggregate brightness of zones rather than individual emitters, the system captures the overall performance and interactions within each zone. This parameter change enables the calibration process to account for interactions between adjacent elements while maintaining a manageable level of complexity through zone-based analysis and correction.
Data Source
AI summary
A method and system for calibrating brightness variation in a display involve measuring brightness levels of light emitters in the display. The light emitters are divided into different groups based on the measured brightness levels. Each group is assigned a sub-frame duration. Groups with higher brightness are assigned shorter sub-frame durations than groups with lower brightness. Calibration information is stored for driving the light emitters such that during a frame period of the display, the light emitters are activated for durations corresponding to the sub-frame duration of their corresponding group.