Off-Axis Display Angle Correction for Chromaticity and Luminance
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Solution Overview
Problem
Current lighting fixtures and direct display devices employing LEDs face significant chromaticity shift and luminance falloff when viewed off-axis, leading to undesirable color and brightness variations that impact visual consistency and functional effectiveness in applications requiring precise color representation.
Innovation Solution
An active off-axis color correction system that measures the target location and applies real-time corrections to the rendered image, using a configuration file, object tracking device, and goniometric rotational device with servo motors to dynamically correct chromaticity and luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional LED lighting fixtures and display devices are used without correction, then device simplicity is maintained, but chromaticity shift and luminance falloff occur when viewed off-axis
Solution Approach 1:
The system performs preliminary calibration by measuring chromaticity and luminance at multiple off-axis angles before actual use. These measurements are stored in lookup tables that enable real-time correction without complex calculations during operation. The goniometric rotational device pre-maps the angular dependence of color and brightness characteristics.
Solution Approach 2:
The patent introduces intermediary correction components including a goniometric rotational device with servo motors for precise angular positioning, an object tracking device for monitoring target location, and a measurement control system for coordinating calibration. These intermediaries mediate between the LED light source and the final light output to eliminate off-axis deviations.
2Adaptability or versatility
If the emission angle range is limited to maintain acceptable color quality, then chromaticity consistency is improved, but adaptability to different viewing angles deteriorates
Solution Approach 1:
The system dynamically adjusts the emitted light characteristics based on the actual viewing angle. The object tracking device continuously monitors target location, and the measurement control system retrieves appropriate correction values from lookup tables corresponding to different angles. This enables the system to adapt to any viewing angle while maintaining chromaticity consistency through real-time correction.
Solution Approach 2:
The patent changes the parameters of the emitted light by applying correction factors to the LED output. The measurement control system modifies the intensity and spectral composition of light based on angular position data, retrieving correction values that compensate for expected chromaticity shift and luminance falloff at each specific angle.
3Measurement precision
If real-time off-axis correction is implemented, then color accuracy is improved, but processing time and computational complexity increase
Solution Approach 1:
The system performs all complex measurements and calculations during an initial calibration phase using the goniometric rotational device. Chromaticity and luminance are measured at multiple angles and stored in lookup tables. During actual operation, the system only needs to retrieve pre-computed correction values based on the current angle, eliminating the need for real-time complex calculations.
Solution Approach 2:
The patent creates a simplified model of the off-axis behavior through lookup tables that copy the essential correction information from comprehensive measurements. Instead of performing full spectral analysis in real-time, the system uses pre-recorded correction data that replicates the effect of detailed measurements, enabling fast retrieval and application of correction factors.
Data Source
AI summary
Correcting an image rendered on a display for a target, including: an object tracking device to measure a relative position to the target; a configuration file including at least a list of target angles to rotate the display in relation to the relative position of the object tracking device; a measurement control system to ingest the configuration file, the measurement control system to initiate a sequence by tracking stability display while displaying a grey scale value of the target that is a basis for subsequent angular measurements; and a goniometric rotational device including a pair of servo motors to place a point of rotation on an axis aligned surface normal of the display.