Color Sequential Display Pixel Shifting for Motion Artifact Correction
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Solution Overview
Problem
Color Sequential (CS) displays in vehicle systems experience image motion artifacts like rainbowing when handling scene direction changes, leading to undesirable effects such as retina blur, which are mitigated by Color Filter (CF) displays but at the cost of slower frame rates and higher latency.
Innovation Solution
A processor-implemented method and system that calculates sub-frame timing and pixel shifts for CS displays to correct image motion artifacts by unpacking and re-packing RGB frames, aligning them with Line of Sight (LOS) motion rates, thereby eliminating rainbowing and retina blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Color Sequential (CS) displays are used, then frame rate and brightness are improved, but image motion artifacts like rainbowing occur
Solution Approach 1:
The system performs preliminary calculations of pixel shifts based on predicted head motion before the actual motion occurs. By pre-calculating the necessary pixel shifts for each color sub-frame based on anticipated LOS changes, the system compensates for motion artifacts before they manifest, allowing CS displays to maintain high frame rates without rainbowing effects
Solution Approach 2:
The coherent RGB image frame is segmented into separate color sub-frames (red, green, blue components). Each color sub-frame is processed independently with its own pixel shift calculation and application. This segmentation allows the system to correct motion artifacts for each color channel individually, eliminating rainbowing while preserving the high frame rate capability of CS displays
2Object-generated harmful factors
If Color Filter (CF) displays are used to eliminate rainbowing, then motion artifacts are reduced, but frame rate and latency are worsened
Solution Approach 1:
The system replaces the mechanical/optical solution of using CF displays (which physically filter colors to prevent rainbowing but slow down frame rates) with a computational approach. By using pixel shift calculations and image processing algorithms, the system achieves motion artifact correction through software rather than hardware filtering, thereby maintaining the high frame rate and low latency characteristics of CS displays while eliminating rainbowing
3Object-generated harmful factors
If Color Filter (CF) displays are used, then rainbowing is eliminated, but latency increases causing retina blur
Solution Approach 1:
The system performs preliminary processing of color sub-frames and pixel shift calculations before display output. By pre-calculating motion compensation parameters and preparing corrected sub-frames in advance, the system reduces the processing time required during actual display refresh cycles, thereby maintaining low latency while eliminating rainbowing artifacts through computational methods
Data Source
AI summary
Systems and methods for providing image motion artifact correction for a color sequential (CS) display in a display system in a vehicle. The system includes a processor operationally coupled to a source of a coherent RGB image frame, a source of a line of sight (LOS) motion rate, and the display system, the processor configured to, calculate a sub-frame (SF) timing rate for the CS display; unpack the coherent RGB image frame into a Red, a Green, and a Blue frame; calculate a red, a green, and a blue pixel shift, as a function of a LOS rate change; apply the red pixel shift to the Red frame, the green pixel shift to the Green frame, and the blue pixel shift to the Blue frame, thereby creating modified RGB sub-frames; and re-packing the modified RGB sub-frames into a modified coherent RGB image frame for the CS display.